diff options
Diffstat (limited to 'lib/dns/zone.c')
| -rw-r--r-- | lib/dns/zone.c | 8043 |
1 files changed, 8043 insertions, 0 deletions
diff --git a/lib/dns/zone.c b/lib/dns/zone.c new file mode 100644 index 0000000..fa6ac46 --- /dev/null +++ b/lib/dns/zone.c @@ -0,0 +1,8043 @@ +/* + * Copyright (C) 2004-2007 Internet Systems Consortium, Inc. ("ISC") + * Copyright (C) 1999-2003 Internet Software Consortium. + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH + * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY + * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, + * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM + * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE + * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR + * PERFORMANCE OF THIS SOFTWARE. + */ + +/* $Id: zone.c,v 1.410.18.52 2007/08/30 05:15:03 marka Exp $ */ + +/*! \file */ + +#include <config.h> + +#include <isc/file.h> +#include <isc/mutex.h> +#include <isc/print.h> +#include <isc/random.h> +#include <isc/ratelimiter.h> +#include <isc/refcount.h> +#include <isc/rwlock.h> +#include <isc/serial.h> +#include <isc/string.h> +#include <isc/taskpool.h> +#include <isc/timer.h> +#include <isc/util.h> + +#include <dns/acache.h> +#include <dns/acl.h> +#include <dns/adb.h> +#include <dns/callbacks.h> +#include <dns/db.h> +#include <dns/dbiterator.h> +#include <dns/events.h> +#include <dns/journal.h> +#include <dns/log.h> +#include <dns/master.h> +#include <dns/masterdump.h> +#include <dns/message.h> +#include <dns/name.h> +#include <dns/peer.h> +#include <dns/rcode.h> +#include <dns/rdataclass.h> +#include <dns/rdatalist.h> +#include <dns/rdataset.h> +#include <dns/rdatastruct.h> +#include <dns/rdatatype.h> +#include <dns/request.h> +#include <dns/resolver.h> +#include <dns/result.h> +#include <dns/stats.h> +#include <dns/ssu.h> +#include <dns/tsig.h> +#include <dns/xfrin.h> +#include <dns/zone.h> + +#define ZONE_MAGIC ISC_MAGIC('Z', 'O', 'N', 'E') +#define DNS_ZONE_VALID(zone) ISC_MAGIC_VALID(zone, ZONE_MAGIC) + +#define NOTIFY_MAGIC ISC_MAGIC('N', 't', 'f', 'y') +#define DNS_NOTIFY_VALID(notify) ISC_MAGIC_VALID(notify, NOTIFY_MAGIC) + +#define STUB_MAGIC ISC_MAGIC('S', 't', 'u', 'b') +#define DNS_STUB_VALID(stub) ISC_MAGIC_VALID(stub, STUB_MAGIC) + +#define ZONEMGR_MAGIC ISC_MAGIC('Z', 'm', 'g', 'r') +#define DNS_ZONEMGR_VALID(stub) ISC_MAGIC_VALID(stub, ZONEMGR_MAGIC) + +#define LOAD_MAGIC ISC_MAGIC('L', 'o', 'a', 'd') +#define DNS_LOAD_VALID(load) ISC_MAGIC_VALID(load, LOAD_MAGIC) + +#define FORWARD_MAGIC ISC_MAGIC('F', 'o', 'r', 'w') +#define DNS_FORWARD_VALID(load) ISC_MAGIC_VALID(load, FORWARD_MAGIC) + +#define IO_MAGIC ISC_MAGIC('Z', 'm', 'I', 'O') +#define DNS_IO_VALID(load) ISC_MAGIC_VALID(load, IO_MAGIC) + +/*% + * Ensure 'a' is at least 'min' but not more than 'max'. + */ +#define RANGE(a, min, max) \ + (((a) < (min)) ? (min) : ((a) < (max) ? (a) : (max))) + +/* + * Default values. + */ +#define DNS_DEFAULT_IDLEIN 3600 /*%< 1 hour */ +#define DNS_DEFAULT_IDLEOUT 3600 /*%< 1 hour */ +#define MAX_XFER_TIME (2*3600) /*%< Documented default is 2 hours */ + +#ifndef DNS_MAX_EXPIRE +#define DNS_MAX_EXPIRE 14515200 /*%< 24 weeks */ +#endif + +#ifndef DNS_DUMP_DELAY +#define DNS_DUMP_DELAY 900 /*%< 15 minutes */ +#endif + +typedef struct dns_notify dns_notify_t; +typedef struct dns_stub dns_stub_t; +typedef struct dns_load dns_load_t; +typedef struct dns_forward dns_forward_t; +typedef struct dns_io dns_io_t; +typedef ISC_LIST(dns_io_t) dns_iolist_t; + +#define DNS_ZONE_CHECKLOCK +#ifdef DNS_ZONE_CHECKLOCK +#define LOCK_ZONE(z) \ + do { LOCK(&(z)->lock); \ + INSIST((z)->locked == ISC_FALSE); \ + (z)->locked = ISC_TRUE; \ + } while (0) +#define UNLOCK_ZONE(z) \ + do { (z)->locked = ISC_FALSE; UNLOCK(&(z)->lock); } while (0) +#define LOCKED_ZONE(z) ((z)->locked) +#else +#define LOCK_ZONE(z) LOCK(&(z)->lock) +#define UNLOCK_ZONE(z) UNLOCK(&(z)->lock) +#define LOCKED_ZONE(z) ISC_TRUE +#endif + +#ifdef ISC_RWLOCK_USEATOMIC +#define ZONEDB_INITLOCK(l) isc_rwlock_init((l), 0, 0) +#define ZONEDB_DESTROYLOCK(l) isc_rwlock_destroy(l) +#define ZONEDB_LOCK(l, t) RWLOCK((l), (t)) +#define ZONEDB_UNLOCK(l, t) RWUNLOCK((l), (t)) +#else +#define ZONEDB_INITLOCK(l) isc_mutex_init(l) +#define ZONEDB_DESTROYLOCK(l) DESTROYLOCK(l) +#define ZONEDB_LOCK(l, t) LOCK(l) +#define ZONEDB_UNLOCK(l, t) UNLOCK(l) +#endif + +struct dns_zone { + /* Unlocked */ + unsigned int magic; + isc_mutex_t lock; +#ifdef DNS_ZONE_CHECKLOCK + isc_boolean_t locked; +#endif + isc_mem_t *mctx; + isc_refcount_t erefs; + +#ifdef ISC_RWLOCK_USEATOMIC + isc_rwlock_t dblock; +#else + isc_mutex_t dblock; +#endif + dns_db_t *db; /* Locked by dblock */ + + /* Locked */ + dns_zonemgr_t *zmgr; + ISC_LINK(dns_zone_t) link; /* Used by zmgr. */ + isc_timer_t *timer; + unsigned int irefs; + dns_name_t origin; + char *masterfile; + dns_masterformat_t masterformat; + char *journal; + isc_int32_t journalsize; + dns_rdataclass_t rdclass; + dns_zonetype_t type; + unsigned int flags; + unsigned int options; + unsigned int db_argc; + char **db_argv; + isc_time_t expiretime; + isc_time_t refreshtime; + isc_time_t dumptime; + isc_time_t loadtime; + isc_time_t notifytime; + isc_uint32_t serial; + isc_uint32_t refresh; + isc_uint32_t retry; + isc_uint32_t expire; + isc_uint32_t minimum; + char *keydirectory; + + isc_uint32_t maxrefresh; + isc_uint32_t minrefresh; + isc_uint32_t maxretry; + isc_uint32_t minretry; + + isc_sockaddr_t *masters; + dns_name_t **masterkeynames; + isc_boolean_t *mastersok; + unsigned int masterscnt; + unsigned int curmaster; + isc_sockaddr_t masteraddr; + dns_notifytype_t notifytype; + isc_sockaddr_t *notify; + unsigned int notifycnt; + isc_sockaddr_t notifyfrom; + isc_task_t *task; + isc_sockaddr_t notifysrc4; + isc_sockaddr_t notifysrc6; + isc_sockaddr_t xfrsource4; + isc_sockaddr_t xfrsource6; + isc_sockaddr_t altxfrsource4; + isc_sockaddr_t altxfrsource6; + isc_sockaddr_t sourceaddr; + dns_xfrin_ctx_t *xfr; /* task locked */ + dns_tsigkey_t *tsigkey; /* key used for xfr */ + /* Access Control Lists */ + dns_acl_t *update_acl; + dns_acl_t *forward_acl; + dns_acl_t *notify_acl; + dns_acl_t *query_acl; + dns_acl_t *xfr_acl; + isc_boolean_t update_disabled; + isc_boolean_t zero_no_soa_ttl; + dns_severity_t check_names; + ISC_LIST(dns_notify_t) notifies; + dns_request_t *request; + dns_loadctx_t *lctx; + dns_io_t *readio; + dns_dumpctx_t *dctx; + dns_io_t *writeio; + isc_uint32_t maxxfrin; + isc_uint32_t maxxfrout; + isc_uint32_t idlein; + isc_uint32_t idleout; + isc_event_t ctlevent; + dns_ssutable_t *ssutable; + isc_uint32_t sigvalidityinterval; + dns_view_t *view; + dns_acache_t *acache; + dns_checkmxfunc_t checkmx; + dns_checksrvfunc_t checksrv; + dns_checknsfunc_t checkns; + /*% + * Zones in certain states such as "waiting for zone transfer" + * or "zone transfer in progress" are kept on per-state linked lists + * in the zone manager using the 'statelink' field. The 'statelist' + * field points at the list the zone is currently on. It the zone + * is not on any such list, statelist is NULL. + */ + ISC_LINK(dns_zone_t) statelink; + dns_zonelist_t *statelist; + /*% + * Optional per-zone statistics counters (NULL if not present). + */ + isc_uint64_t *counters; + isc_uint32_t notifydelay; + dns_isselffunc_t isself; + void *isselfarg; + + /*% + * Serial number for deferred journal compaction. + */ + isc_uint32_t compact_serial; +}; + +#define DNS_ZONE_FLAG(z,f) (ISC_TF(((z)->flags & (f)) != 0)) +#define DNS_ZONE_SETFLAG(z,f) do { \ + INSIST(LOCKED_ZONE(z)); \ + (z)->flags |= (f); \ + } while (0) +#define DNS_ZONE_CLRFLAG(z,f) do { \ + INSIST(LOCKED_ZONE(z)); \ + (z)->flags &= ~(f); \ + } while (0) + /* XXX MPA these may need to go back into zone.h */ +#define DNS_ZONEFLG_REFRESH 0x00000001U /*%< refresh check in progress */ +#define DNS_ZONEFLG_NEEDDUMP 0x00000002U /*%< zone need consolidation */ +#define DNS_ZONEFLG_USEVC 0x00000004U /*%< use tcp for refresh query */ +#define DNS_ZONEFLG_DUMPING 0x00000008U /*%< a dump is in progress */ +#define DNS_ZONEFLG_HASINCLUDE 0x00000010U /*%< $INCLUDE in zone file */ +#define DNS_ZONEFLG_LOADED 0x00000020U /*%< database has loaded */ +#define DNS_ZONEFLG_EXITING 0x00000040U /*%< zone is being destroyed */ +#define DNS_ZONEFLG_EXPIRED 0x00000080U /*%< zone has expired */ +#define DNS_ZONEFLG_NEEDREFRESH 0x00000100U /*%< refresh check needed */ +#define DNS_ZONEFLG_UPTODATE 0x00000200U /*%< zone contents are + * uptodate */ +#define DNS_ZONEFLG_NEEDNOTIFY 0x00000400U /*%< need to send out notify + * messages */ +#define DNS_ZONEFLG_DIFFONRELOAD 0x00000800U /*%< generate a journal diff on + * reload */ +#define DNS_ZONEFLG_NOMASTERS 0x00001000U /*%< an attempt to refresh a + * zone with no masters + * occured */ +#define DNS_ZONEFLG_LOADING 0x00002000U /*%< load from disk in progress*/ +#define DNS_ZONEFLG_HAVETIMERS 0x00004000U /*%< timer values have been set + * from SOA (if not set, we + * are still using + * default timer values) */ +#define DNS_ZONEFLG_FORCEXFER 0x00008000U /*%< Force a zone xfer */ +#define DNS_ZONEFLG_NOREFRESH 0x00010000U +#define DNS_ZONEFLG_DIALNOTIFY 0x00020000U +#define DNS_ZONEFLG_DIALREFRESH 0x00040000U +#define DNS_ZONEFLG_SHUTDOWN 0x00080000U +#define DNS_ZONEFLAG_NOIXFR 0x00100000U /*%< IXFR failed, force AXFR */ +#define DNS_ZONEFLG_FLUSH 0x00200000U +#define DNS_ZONEFLG_NOEDNS 0x00400000U +#define DNS_ZONEFLG_USEALTXFRSRC 0x00800000U +#define DNS_ZONEFLG_SOABEFOREAXFR 0x01000000U +#define DNS_ZONEFLG_NEEDCOMPACT 0x02000000U + +#define DNS_ZONE_OPTION(z,o) (((z)->options & (o)) != 0) + +/* Flags for zone_load() */ +#define DNS_ZONELOADFLAG_NOSTAT 0x00000001U /* Do not stat() master files */ + +struct dns_zonemgr { + unsigned int magic; + isc_mem_t * mctx; + int refs; /* Locked by rwlock */ + isc_taskmgr_t * taskmgr; + isc_timermgr_t * timermgr; + isc_socketmgr_t * socketmgr; + isc_taskpool_t * zonetasks; + isc_task_t * task; + isc_ratelimiter_t * rl; + isc_rwlock_t rwlock; + isc_mutex_t iolock; + + /* Locked by rwlock. */ + dns_zonelist_t zones; + dns_zonelist_t waiting_for_xfrin; + dns_zonelist_t xfrin_in_progress; + + /* Configuration data. */ + isc_uint32_t transfersin; + isc_uint32_t transfersperns; + unsigned int serialqueryrate; + + /* Locked by iolock */ + isc_uint32_t iolimit; + isc_uint32_t ioactive; + dns_iolist_t high; + dns_iolist_t low; +}; + +/*% + * Hold notify state. + */ +struct dns_notify { + unsigned int magic; + unsigned int flags; + isc_mem_t *mctx; + dns_zone_t *zone; + dns_adbfind_t *find; + dns_request_t *request; + dns_name_t ns; + isc_sockaddr_t dst; + ISC_LINK(dns_notify_t) link; +}; + +#define DNS_NOTIFY_NOSOA 0x0001U + +/*% + * dns_stub holds state while performing a 'stub' transfer. + * 'db' is the zone's 'db' or a new one if this is the initial + * transfer. + */ + +struct dns_stub { + unsigned int magic; + isc_mem_t *mctx; + dns_zone_t *zone; + dns_db_t *db; + dns_dbversion_t *version; +}; + +/*% + * Hold load state. + */ +struct dns_load { + unsigned int magic; + isc_mem_t *mctx; + dns_zone_t *zone; + dns_db_t *db; + isc_time_t loadtime; + dns_rdatacallbacks_t callbacks; +}; + +/*% + * Hold forward state. + */ +struct dns_forward { + unsigned int magic; + isc_mem_t *mctx; + dns_zone_t *zone; + isc_buffer_t *msgbuf; + dns_request_t *request; + isc_uint32_t which; + isc_sockaddr_t addr; + dns_updatecallback_t callback; + void *callback_arg; +}; + +/*% + * Hold IO request state. + */ +struct dns_io { + unsigned int magic; + dns_zonemgr_t *zmgr; + isc_boolean_t high; + isc_task_t *task; + ISC_LINK(dns_io_t) link; + isc_event_t *event; +}; + +#define SEND_BUFFER_SIZE 2048 + +static void zone_settimer(dns_zone_t *, isc_time_t *); +static void cancel_refresh(dns_zone_t *); +static void zone_debuglog(dns_zone_t *zone, const char *, int debuglevel, + const char *msg, ...) ISC_FORMAT_PRINTF(4, 5); +static void notify_log(dns_zone_t *zone, int level, const char *fmt, ...) + ISC_FORMAT_PRINTF(3, 4); +static void queue_xfrin(dns_zone_t *zone); +static void zone_unload(dns_zone_t *zone); +static void zone_expire(dns_zone_t *zone); +static void zone_iattach(dns_zone_t *source, dns_zone_t **target); +static void zone_idetach(dns_zone_t **zonep); +static isc_result_t zone_replacedb(dns_zone_t *zone, dns_db_t *db, + isc_boolean_t dump); +static inline void zone_attachdb(dns_zone_t *zone, dns_db_t *db); +static inline void zone_detachdb(dns_zone_t *zone); +static isc_result_t default_journal(dns_zone_t *zone); +static void zone_xfrdone(dns_zone_t *zone, isc_result_t result); +static isc_result_t zone_postload(dns_zone_t *zone, dns_db_t *db, + isc_time_t loadtime, isc_result_t result); +static void zone_needdump(dns_zone_t *zone, unsigned int delay); +static void zone_shutdown(isc_task_t *, isc_event_t *); +static void zone_loaddone(void *arg, isc_result_t result); +static isc_result_t zone_startload(dns_db_t *db, dns_zone_t *zone, + isc_time_t loadtime); + +#if 0 +/* ondestroy example */ +static void dns_zonemgr_dbdestroyed(isc_task_t *task, isc_event_t *event); +#endif + +static void refresh_callback(isc_task_t *, isc_event_t *); +static void stub_callback(isc_task_t *, isc_event_t *); +static void queue_soa_query(dns_zone_t *zone); +static void soa_query(isc_task_t *, isc_event_t *); +static void ns_query(dns_zone_t *zone, dns_rdataset_t *soardataset, + dns_stub_t *stub); +static int message_count(dns_message_t *msg, dns_section_t section, + dns_rdatatype_t type); +static void notify_cancel(dns_zone_t *zone); +static void notify_find_address(dns_notify_t *notify); +static void notify_send(dns_notify_t *notify); +static isc_result_t notify_createmessage(dns_zone_t *zone, + unsigned int flags, + dns_message_t **messagep); +static void notify_done(isc_task_t *task, isc_event_t *event); +static void notify_send_toaddr(isc_task_t *task, isc_event_t *event); +static isc_result_t zone_dump(dns_zone_t *, isc_boolean_t); +static void got_transfer_quota(isc_task_t *task, isc_event_t *event); +static isc_result_t zmgr_start_xfrin_ifquota(dns_zonemgr_t *zmgr, + dns_zone_t *zone); +static void zmgr_resume_xfrs(dns_zonemgr_t *zmgr, isc_boolean_t multi); +static void zonemgr_free(dns_zonemgr_t *zmgr); +static isc_result_t zonemgr_getio(dns_zonemgr_t *zmgr, isc_boolean_t high, + isc_task_t *task, isc_taskaction_t action, + void *arg, dns_io_t **iop); +static void zonemgr_putio(dns_io_t **iop); +static void zonemgr_cancelio(dns_io_t *io); + +static isc_result_t +zone_get_from_db(dns_zone_t *zone, dns_db_t *db, unsigned int *nscount, + unsigned int *soacount, isc_uint32_t *serial, + isc_uint32_t *refresh, isc_uint32_t *retry, + isc_uint32_t *expire, isc_uint32_t *minimum, + unsigned int *errors); + +static void zone_freedbargs(dns_zone_t *zone); +static void forward_callback(isc_task_t *task, isc_event_t *event); +static void zone_saveunique(dns_zone_t *zone, const char *path, + const char *templat); +static void zone_maintenance(dns_zone_t *zone); +static void zone_notify(dns_zone_t *zone, isc_time_t *now); +static void dump_done(void *arg, isc_result_t result); + +#define ENTER zone_debuglog(zone, me, 1, "enter") + +static const unsigned int dbargc_default = 1; +static const char *dbargv_default[] = { "rbt" }; + +#define DNS_ZONE_JITTER_ADD(a, b, c) \ + do { \ + isc_interval_t _i; \ + isc_uint32_t _j; \ + _j = isc_random_jitter((b), (b)/4); \ + isc_interval_set(&_i, _j, 0); \ + if (isc_time_add((a), &_i, (c)) != ISC_R_SUCCESS) { \ + dns_zone_log(zone, ISC_LOG_WARNING, \ + "epoch approaching: upgrade required: " \ + "now + %s failed", #b); \ + isc_interval_set(&_i, _j/2, 0); \ + (void)isc_time_add((a), &_i, (c)); \ + } \ + } while (0) + +#define DNS_ZONE_TIME_ADD(a, b, c) \ + do { \ + isc_interval_t _i; \ + isc_interval_set(&_i, (b), 0); \ + if (isc_time_add((a), &_i, (c)) != ISC_R_SUCCESS) { \ + dns_zone_log(zone, ISC_LOG_WARNING, \ + "epoch approaching: upgrade required: " \ + "now + %s failed", #b); \ + isc_interval_set(&_i, (b)/2, 0); \ + (void)isc_time_add((a), &_i, (c)); \ + } \ + } while (0) + +/*** + *** Public functions. + ***/ + +isc_result_t +dns_zone_create(dns_zone_t **zonep, isc_mem_t *mctx) { + isc_result_t result; + dns_zone_t *zone; + isc_time_t now; + + REQUIRE(zonep != NULL && *zonep == NULL); + REQUIRE(mctx != NULL); + + TIME_NOW(&now); + zone = isc_mem_get(mctx, sizeof(*zone)); + if (zone == NULL) + return (ISC_R_NOMEMORY); + + zone->mctx = NULL; + isc_mem_attach(mctx, &zone->mctx); + + result = isc_mutex_init(&zone->lock); + if (result != ISC_R_SUCCESS) + goto free_zone; + + result = ZONEDB_INITLOCK(&zone->dblock); + if (result != ISC_R_SUCCESS) + goto free_mutex; + + /* XXX MPA check that all elements are initialised */ +#ifdef DNS_ZONE_CHECKLOCK + zone->locked = ISC_FALSE; +#endif + zone->db = NULL; + zone->zmgr = NULL; + ISC_LINK_INIT(zone, link); + result = isc_refcount_init(&zone->erefs, 1); /* Implicit attach. */ + if (result != ISC_R_SUCCESS) + goto free_dblock; + zone->irefs = 0; + dns_name_init(&zone->origin, NULL); + zone->masterfile = NULL; + zone->masterformat = dns_masterformat_none; + zone->keydirectory = NULL; + zone->journalsize = -1; + zone->journal = NULL; + zone->rdclass = dns_rdataclass_none; + zone->type = dns_zone_none; + zone->flags = 0; + zone->options = 0; + zone->db_argc = 0; + zone->db_argv = NULL; + isc_time_settoepoch(&zone->expiretime); + isc_time_settoepoch(&zone->refreshtime); + isc_time_settoepoch(&zone->dumptime); + isc_time_settoepoch(&zone->loadtime); + zone->notifytime = now; + zone->serial = 0; + zone->refresh = DNS_ZONE_DEFAULTREFRESH; + zone->retry = DNS_ZONE_DEFAULTRETRY; + zone->expire = 0; + zone->minimum = 0; + zone->maxrefresh = DNS_ZONE_MAXREFRESH; + zone->minrefresh = DNS_ZONE_MINREFRESH; + zone->maxretry = DNS_ZONE_MAXRETRY; + zone->minretry = DNS_ZONE_MINRETRY; + zone->masters = NULL; + zone->masterkeynames = NULL; + zone->mastersok = NULL; + zone->masterscnt = 0; + zone->curmaster = 0; + zone->notify = NULL; + zone->notifytype = dns_notifytype_yes; + zone->notifycnt = 0; + zone->task = NULL; + zone->update_acl = NULL; + zone->forward_acl = NULL; + zone->notify_acl = NULL; + zone->query_acl = NULL; + zone->xfr_acl = NULL; + zone->update_disabled = ISC_FALSE; + zone->zero_no_soa_ttl = ISC_TRUE; + zone->check_names = dns_severity_ignore; + zone->request = NULL; + zone->lctx = NULL; + zone->readio = NULL; + zone->dctx = NULL; + zone->writeio = NULL; + zone->timer = NULL; + zone->idlein = DNS_DEFAULT_IDLEIN; + zone->idleout = DNS_DEFAULT_IDLEOUT; + ISC_LIST_INIT(zone->notifies); + isc_sockaddr_any(&zone->notifysrc4); + isc_sockaddr_any6(&zone->notifysrc6); + isc_sockaddr_any(&zone->xfrsource4); + isc_sockaddr_any6(&zone->xfrsource6); + isc_sockaddr_any(&zone->altxfrsource4); + isc_sockaddr_any6(&zone->altxfrsource6); + zone->xfr = NULL; + zone->tsigkey = NULL; + zone->maxxfrin = MAX_XFER_TIME; + zone->maxxfrout = MAX_XFER_TIME; + zone->ssutable = NULL; + zone->sigvalidityinterval = 30 * 24 * 3600; + zone->view = NULL; + zone->acache = NULL; + zone->checkmx = NULL; + zone->checksrv = NULL; + zone->checkns = NULL; + ISC_LINK_INIT(zone, statelink); + zone->statelist = NULL; + zone->counters = NULL; + zone->notifydelay = 5; + zone->isself = NULL; + zone->isselfarg = NULL; + + zone->magic = ZONE_MAGIC; + + /* Must be after magic is set. */ + result = dns_zone_setdbtype(zone, dbargc_default, dbargv_default); + if (result != ISC_R_SUCCESS) + goto free_erefs; + + ISC_EVENT_INIT(&zone->ctlevent, sizeof(zone->ctlevent), 0, NULL, + DNS_EVENT_ZONECONTROL, zone_shutdown, zone, zone, + NULL, NULL); + *zonep = zone; + return (ISC_R_SUCCESS); + + free_erefs: + isc_refcount_decrement(&zone->erefs, NULL); + isc_refcount_destroy(&zone->erefs); + + free_dblock: + ZONEDB_DESTROYLOCK(&zone->dblock); + + free_mutex: + DESTROYLOCK(&zone->lock); + + free_zone: + isc_mem_putanddetach(&zone->mctx, zone, sizeof(*zone)); + return (result); +} + +/* + * Free a zone. Because we require that there be no more + * outstanding events or references, no locking is necessary. + */ +static void +zone_free(dns_zone_t *zone) { + isc_mem_t *mctx = NULL; + + REQUIRE(DNS_ZONE_VALID(zone)); + REQUIRE(isc_refcount_current(&zone->erefs) == 0); + REQUIRE(zone->irefs == 0); + REQUIRE(!LOCKED_ZONE(zone)); + REQUIRE(zone->timer == NULL); + + /* + * Managed objects. Order is important. + */ + if (zone->request != NULL) + dns_request_destroy(&zone->request); /* XXXMPA */ + INSIST(zone->readio == NULL); + INSIST(zone->statelist == NULL); + INSIST(zone->writeio == NULL); + + if (zone->task != NULL) + isc_task_detach(&zone->task); + if (zone->zmgr) + dns_zonemgr_releasezone(zone->zmgr, zone); + + /* Unmanaged objects */ + if (zone->masterfile != NULL) + isc_mem_free(zone->mctx, zone->masterfile); + zone->masterfile = NULL; + if (zone->keydirectory != NULL) + isc_mem_free(zone->mctx, zone->keydirectory); + zone->keydirectory = NULL; + zone->journalsize = -1; + if (zone->journal != NULL) + isc_mem_free(zone->mctx, zone->journal); + zone->journal = NULL; + if (zone->counters != NULL) + dns_stats_freecounters(zone->mctx, &zone->counters); + if (zone->db != NULL) + zone_detachdb(zone); + if (zone->acache != NULL) + dns_acache_detach(&zone->acache); + zone_freedbargs(zone); + RUNTIME_CHECK(dns_zone_setmasterswithkeys(zone, NULL, NULL, 0) + == ISC_R_SUCCESS); + RUNTIME_CHECK(dns_zone_setalsonotify(zone, NULL, 0) + == ISC_R_SUCCESS); + zone->check_names = dns_severity_ignore; + if (zone->update_acl != NULL) + dns_acl_detach(&zone->update_acl); + if (zone->forward_acl != NULL) + dns_acl_detach(&zone->forward_acl); + if (zone->notify_acl != NULL) + dns_acl_detach(&zone->notify_acl); + if (zone->query_acl != NULL) + dns_acl_detach(&zone->query_acl); + if (zone->xfr_acl != NULL) + dns_acl_detach(&zone->xfr_acl); + if (dns_name_dynamic(&zone->origin)) + dns_name_free(&zone->origin, zone->mctx); + if (zone->ssutable != NULL) + dns_ssutable_detach(&zone->ssutable); + + /* last stuff */ + ZONEDB_DESTROYLOCK(&zone->dblock); + DESTROYLOCK(&zone->lock); + isc_refcount_destroy(&zone->erefs); + zone->magic = 0; + mctx = zone->mctx; + isc_mem_put(mctx, zone, sizeof(*zone)); + isc_mem_detach(&mctx); +} + +/* + * Single shot. + */ +void +dns_zone_setclass(dns_zone_t *zone, dns_rdataclass_t rdclass) { + + REQUIRE(DNS_ZONE_VALID(zone)); + REQUIRE(rdclass != dns_rdataclass_none); + + /* + * Test and set. + */ + LOCK_ZONE(zone); + REQUIRE(zone->rdclass == dns_rdataclass_none || + zone->rdclass == rdclass); + zone->rdclass = rdclass; + UNLOCK_ZONE(zone); +} + +dns_rdataclass_t +dns_zone_getclass(dns_zone_t *zone){ + REQUIRE(DNS_ZONE_VALID(zone)); + + return (zone->rdclass); +} + +void +dns_zone_setnotifytype(dns_zone_t *zone, dns_notifytype_t notifytype) { + REQUIRE(DNS_ZONE_VALID(zone)); + + LOCK_ZONE(zone); + zone->notifytype = notifytype; + UNLOCK_ZONE(zone); +} + +/* + * Single shot. + */ +void +dns_zone_settype(dns_zone_t *zone, dns_zonetype_t type) { + + REQUIRE(DNS_ZONE_VALID(zone)); + REQUIRE(type != dns_zone_none); + + /* + * Test and set. + */ + LOCK_ZONE(zone); + REQUIRE(zone->type == dns_zone_none || zone->type == type); + zone->type = type; + UNLOCK_ZONE(zone); +} + +static void +zone_freedbargs(dns_zone_t *zone) { + unsigned int i; + + /* Free the old database argument list. */ + if (zone->db_argv != NULL) { + for (i = 0; i < zone->db_argc; i++) + isc_mem_free(zone->mctx, zone->db_argv[i]); + isc_mem_put(zone->mctx, zone->db_argv, + zone->db_argc * sizeof(*zone->db_argv)); + } + zone->db_argc = 0; + zone->db_argv = NULL; +} + +isc_result_t +dns_zone_getdbtype(dns_zone_t *zone, char ***argv, isc_mem_t *mctx) { + size_t size = 0; + unsigned int i; + isc_result_t result = ISC_R_SUCCESS; + void *mem; + char **tmp, *tmp2; + + REQUIRE(DNS_ZONE_VALID(zone)); + REQUIRE(argv != NULL && *argv == NULL); + + LOCK_ZONE(zone); + size = (zone->db_argc + 1) * sizeof(char *); + for (i = 0; i < zone->db_argc; i++) + size += strlen(zone->db_argv[i]) + 1; + mem = isc_mem_allocate(mctx, size); + if (mem != NULL) { + tmp = mem; + tmp2 = mem; + tmp2 += (zone->db_argc + 1) * sizeof(char *); + for (i = 0; i < zone->db_argc; i++) { + *tmp++ = tmp2; + strcpy(tmp2, zone->db_argv[i]); + tmp2 += strlen(tmp2) + 1; + } + *tmp = NULL; + } else + result = ISC_R_NOMEMORY; + UNLOCK_ZONE(zone); + *argv = mem; + return (result); +} + +isc_result_t +dns_zone_setdbtype(dns_zone_t *zone, + unsigned int dbargc, const char * const *dbargv) { + isc_result_t result = ISC_R_SUCCESS; + char **new = NULL; + unsigned int i; + + REQUIRE(DNS_ZONE_VALID(zone)); + REQUIRE(dbargc >= 1); + REQUIRE(dbargv != NULL); + + LOCK_ZONE(zone); + + /* Set up a new database argument list. */ + new = isc_mem_get(zone->mctx, dbargc * sizeof(*new)); + if (new == NULL) + goto nomem; + for (i = 0; i < dbargc; i++) + new[i] = NULL; + for (i = 0; i < dbargc; i++) { + new[i] = isc_mem_strdup(zone->mctx, dbargv[i]); + if (new[i] == NULL) + goto nomem; + } + + /* Free the old list. */ + zone_freedbargs(zone); + + zone->db_argc = dbargc; + zone->db_argv = new; + result = ISC_R_SUCCESS; + goto unlock; + + nomem: + if (new != NULL) { + for (i = 0; i < dbargc; i++) + if (new[i] != NULL) + isc_mem_free(zone->mctx, new[i]); + isc_mem_put(zone->mctx, new, dbargc * sizeof(*new)); + } + result = ISC_R_NOMEMORY; + + unlock: + UNLOCK_ZONE(zone); + return (result); +} + +void +dns_zone_setview(dns_zone_t *zone, dns_view_t *view) { + REQUIRE(DNS_ZONE_VALID(zone)); + + LOCK_ZONE(zone); + if (zone->view != NULL) + dns_view_weakdetach(&zone->view); + dns_view_weakattach(view, &zone->view); + UNLOCK_ZONE(zone); +} + + +dns_view_t * +dns_zone_getview(dns_zone_t *zone) { + REQUIRE(DNS_ZONE_VALID(zone)); + + return (zone->view); +} + + +isc_result_t +dns_zone_setorigin(dns_zone_t *zone, const dns_name_t *origin) { + isc_result_t result; + + REQUIRE(DNS_ZONE_VALID(zone)); + REQUIRE(origin != NULL); + + LOCK_ZONE(zone); + if (dns_name_dynamic(&zone->origin)) { + dns_name_free(&zone->origin, zone->mctx); + dns_name_init(&zone->origin, NULL); + } + result = dns_name_dup(origin, zone->mctx, &zone->origin); + UNLOCK_ZONE(zone); + return (result); +} + +void +dns_zone_setacache(dns_zone_t *zone, dns_acache_t *acache) { + REQUIRE(DNS_ZONE_VALID(zone)); + REQUIRE(acache != NULL); + + LOCK_ZONE(zone); + if (zone->acache != NULL) + dns_acache_detach(&zone->acache); + dns_acache_attach(acache, &zone->acache); + ZONEDB_LOCK(&zone->dblock, isc_rwlocktype_read); + if (zone->db != NULL) { + isc_result_t result; + + /* + * If the zone reuses an existing DB, the DB needs to be + * set in the acache explicitly. We can safely ignore the + * case where the DB is already set. If other error happens, + * the acache will not work effectively. + */ + result = dns_acache_setdb(acache, zone->db); + if (result != ISC_R_SUCCESS && result != ISC_R_EXISTS) { + UNEXPECTED_ERROR(__FILE__, __LINE__, + "dns_acache_setdb() failed: %s", + isc_result_totext(result)); + } + } + ZONEDB_UNLOCK(&zone->dblock, isc_rwlocktype_read); + UNLOCK_ZONE(zone); +} + +static isc_result_t +dns_zone_setstring(dns_zone_t *zone, char **field, const char *value) { + char *copy; + + if (value != NULL) { + copy = isc_mem_strdup(zone->mctx, value); + if (copy == NULL) + return (ISC_R_NOMEMORY); + } else { + copy = NULL; + } + + if (*field != NULL) + isc_mem_free(zone->mctx, *field); + + *field = copy; + return (ISC_R_SUCCESS); +} + +isc_result_t +dns_zone_setfile(dns_zone_t *zone, const char *file) { + return (dns_zone_setfile2(zone, file, dns_masterformat_text)); +} + +isc_result_t +dns_zone_setfile2(dns_zone_t *zone, const char *file, + dns_masterformat_t format) { + isc_result_t result = ISC_R_SUCCESS; + + REQUIRE(DNS_ZONE_VALID(zone)); + + LOCK_ZONE(zone); + result = dns_zone_setstring(zone, &zone->masterfile, file); + if (result == ISC_R_SUCCESS) { + zone->masterformat = format; + result = default_journal(zone); + } + UNLOCK_ZONE(zone); + + return (result); +} + +const char * +dns_zone_getfile(dns_zone_t *zone) { + REQUIRE(DNS_ZONE_VALID(zone)); + + return (zone->masterfile); +} + +static isc_result_t +default_journal(dns_zone_t *zone) { + isc_result_t result; + char *journal; + + REQUIRE(DNS_ZONE_VALID(zone)); + REQUIRE(LOCKED_ZONE(zone)); + + if (zone->masterfile != NULL) { + /* Calculate string length including '\0'. */ + int len = strlen(zone->masterfile) + sizeof(".jnl"); + journal = isc_mem_allocate(zone->mctx, len); + if (journal == NULL) + return (ISC_R_NOMEMORY); + strcpy(journal, zone->masterfile); + strcat(journal, ".jnl"); + } else { + journal = NULL; + } + result = dns_zone_setstring(zone, &zone->journal, journal); + if (journal != NULL) + isc_mem_free(zone->mctx, journal); + return (result); +} + +isc_result_t +dns_zone_setjournal(dns_zone_t *zone, const char *journal) { + isc_result_t result = ISC_R_SUCCESS; + + REQUIRE(DNS_ZONE_VALID(zone)); + + LOCK_ZONE(zone); + result = dns_zone_setstring(zone, &zone->journal, journal); + UNLOCK_ZONE(zone); + + return (result); +} + +char * +dns_zone_getjournal(dns_zone_t *zone) { + REQUIRE(DNS_ZONE_VALID(zone)); + + return (zone->journal); +} + +/* + * Return true iff the zone is "dynamic", in the sense that the zone's + * master file (if any) is written by the server, rather than being + * updated manually and read by the server. + * + * This is true for slave zones, stub zones, and zones that allow + * dynamic updates either by having an update policy ("ssutable") + * or an "allow-update" ACL with a value other than exactly "{ none; }". + */ +static isc_boolean_t +zone_isdynamic(dns_zone_t *zone) { + REQUIRE(DNS_ZONE_VALID(zone)); + + return (ISC_TF(zone->type == dns_zone_slave || + zone->type == dns_zone_stub || + (!zone->update_disabled && zone->ssutable != NULL) || + (!zone->update_disabled && zone->update_acl != NULL && + ! (zone->update_acl->length == 1 && + zone->update_acl->elements[0].negative == ISC_TRUE + && + zone->update_acl->elements[0].type == + dns_aclelementtype_any)))); +} + + +static isc_result_t +zone_load(dns_zone_t *zone, unsigned int flags) { + isc_result_t result; + isc_time_t now; + isc_time_t loadtime, filetime; + dns_db_t *db = NULL; + + REQUIRE(DNS_ZONE_VALID(zone)); + + LOCK_ZONE(zone); + TIME_NOW(&now); + + INSIST(zone->type != dns_zone_none); + + if (DNS_ZONE_FLAG(zone, DNS_ZONEFLG_LOADING)) { + result = ISC_R_SUCCESS; + goto cleanup; + } + + if (zone->db != NULL && zone->masterfile == NULL) { + /* + * The zone has no master file configured, but it already + * has a database. It could be the built-in + * version.bind. CH zone, a zone with a persistent + * database being reloaded, or maybe a zone that + * used to have a master file but whose configuration + * was changed so that it no longer has one. Do nothing. + */ + result = ISC_R_SUCCESS; + goto cleanup; + } + + if (zone->db != NULL && zone_isdynamic(zone)) { + /* + * This is a slave, stub, or dynamically updated + * zone being reloaded. Do nothing - the database + * we already have is guaranteed to be up-to-date. + */ + if (zone->type == dns_zone_master) + result = DNS_R_DYNAMIC; + else + result = ISC_R_SUCCESS; + goto cleanup; + } + + + /* + * Store the current time before the zone is loaded, so that if the + * file changes between the time of the load and the time that + * zone->loadtime is set, then the file will still be reloaded + * the next time dns_zone_load is called. + */ + TIME_NOW(&loadtime); + + /* + * Don't do the load if the file that stores the zone is older + * than the last time the zone was loaded. If the zone has not + * been loaded yet, zone->loadtime will be the epoch. + */ + if (zone->masterfile != NULL) { + /* + * The file is already loaded. If we are just doing a + * "rndc reconfig", we are done. + */ + if (!isc_time_isepoch(&zone->loadtime) && + (flags & DNS_ZONELOADFLAG_NOSTAT) != 0) { + result = ISC_R_SUCCESS; + goto cleanup; + } + + result = isc_file_getmodtime(zone->masterfile, &filetime); + if (result == ISC_R_SUCCESS) { + if (DNS_ZONE_FLAG(zone, DNS_ZONEFLG_LOADED) && + !DNS_ZONE_FLAG(zone, DNS_ZONEFLG_HASINCLUDE) && + isc_time_compare(&filetime, &zone->loadtime) <= 0) { + dns_zone_log(zone, ISC_LOG_DEBUG(1), + "skipping load: master file " + "older than last load"); + result = DNS_R_UPTODATE; + goto cleanup; + } + loadtime = filetime; + } + } + + INSIST(zone->db_argc >= 1); + + /* + * Built in zones don't need to be reloaded. + */ + if (zone->type == dns_zone_master && + strcmp(zone->db_argv[0], "_builtin") == 0 && + DNS_ZONE_FLAG(zone, DNS_ZONEFLG_LOADED)) { + result = ISC_R_SUCCESS; + goto cleanup; + } + + if ((zone->type == dns_zone_slave || zone->type == dns_zone_stub) && + (strcmp(zone->db_argv[0], "rbt") == 0 || + strcmp(zone->db_argv[0], "rbt64") == 0)) { + if (zone->masterfile == NULL || + !isc_file_exists(zone->masterfile)) { + if (zone->masterfile != NULL) { + dns_zone_log(zone, ISC_LOG_DEBUG(1), + "no master file"); + } + zone->refreshtime = now; + if (zone->task != NULL) + zone_settimer(zone, &now); + result = ISC_R_SUCCESS; + goto cleanup; + } + } + + dns_zone_log(zone, ISC_LOG_DEBUG(1), "starting load"); + + result = dns_db_create(zone->mctx, zone->db_argv[0], + &zone->origin, (zone->type == dns_zone_stub) ? + dns_dbtype_stub : dns_dbtype_zone, + zone->rdclass, + zone->db_argc - 1, zone->db_argv + 1, + &db); + + if (result != ISC_R_SUCCESS) { + dns_zone_log(zone, ISC_LOG_ERROR, + "loading zone: creating database: %s", + isc_result_totext(result)); + goto cleanup; + } + dns_db_settask(db, zone->task); + + if (! dns_db_ispersistent(db)) { + if (zone->masterfile != NULL) { + result = zone_startload(db, zone, loadtime); + } else { + result = DNS_R_NOMASTERFILE; + if (zone->type == dns_zone_master) { + dns_zone_log(zone, ISC_LOG_ERROR, + "loading zone: " + "no master file configured"); + goto cleanup; + } + dns_zone_log(zone, ISC_LOG_INFO, "loading zone: " + "no master file configured: continuing"); + } + } + + if (result == DNS_R_CONTINUE) { + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_LOADING); + goto cleanup; + } + + result = zone_postload(zone, db, loadtime, result); + + cleanup: + UNLOCK_ZONE(zone); + if (db != NULL) + dns_db_detach(&db); + return (result); +} + +isc_result_t +dns_zone_load(dns_zone_t *zone) { + return (zone_load(zone, 0)); +} + +isc_result_t +dns_zone_loadnew(dns_zone_t *zone) { + return (zone_load(zone, DNS_ZONELOADFLAG_NOSTAT)); +} + +static void +zone_gotreadhandle(isc_task_t *task, isc_event_t *event) { + dns_load_t *load = event->ev_arg; + isc_result_t result = ISC_R_SUCCESS; + unsigned int options; + + REQUIRE(DNS_LOAD_VALID(load)); + + if ((event->ev_attributes & ISC_EVENTATTR_CANCELED) != 0) + result = ISC_R_CANCELED; + isc_event_free(&event); + if (result == ISC_R_CANCELED) + goto fail; + + options = DNS_MASTER_ZONE; + if (load->zone->type == dns_zone_slave) + options |= DNS_MASTER_SLAVE; + if (DNS_ZONE_OPTION(load->zone, DNS_ZONEOPT_CHECKNS)) + options |= DNS_MASTER_CHECKNS; + if (DNS_ZONE_OPTION(load->zone, DNS_ZONEOPT_FATALNS)) + options |= DNS_MASTER_FATALNS; + if (DNS_ZONE_OPTION(load->zone, DNS_ZONEOPT_CHECKNAMES)) + options |= DNS_MASTER_CHECKNAMES; + if (DNS_ZONE_OPTION(load->zone, DNS_ZONEOPT_CHECKNAMESFAIL)) + options |= DNS_MASTER_CHECKNAMESFAIL; + if (DNS_ZONE_OPTION(load->zone, DNS_ZONEOPT_CHECKMX)) + options |= DNS_MASTER_CHECKMX; + if (DNS_ZONE_OPTION(load->zone, DNS_ZONEOPT_CHECKMXFAIL)) + options |= DNS_MASTER_CHECKMXFAIL; + if (DNS_ZONE_OPTION(load->zone, DNS_ZONEOPT_CHECKWILDCARD)) + options |= DNS_MASTER_CHECKWILDCARD; + result = dns_master_loadfileinc2(load->zone->masterfile, + dns_db_origin(load->db), + dns_db_origin(load->db), + load->zone->rdclass, + options, + &load->callbacks, task, + zone_loaddone, load, + &load->zone->lctx, load->zone->mctx, + load->zone->masterformat); + if (result != ISC_R_SUCCESS && result != DNS_R_CONTINUE && + result != DNS_R_SEENINCLUDE) + goto fail; + return; + + fail: + zone_loaddone(load, result); +} + +static void +zone_gotwritehandle(isc_task_t *task, isc_event_t *event) { + const char me[] = "zone_gotwritehandle"; + dns_zone_t *zone = event->ev_arg; + isc_result_t result = ISC_R_SUCCESS; + dns_dbversion_t *version = NULL; + + REQUIRE(DNS_ZONE_VALID(zone)); + INSIST(task == zone->task); + ENTER; + + if ((event->ev_attributes & ISC_EVENTATTR_CANCELED) != 0) + result = ISC_R_CANCELED; + isc_event_free(&event); + if (result == ISC_R_CANCELED) + goto fail; + + LOCK_ZONE(zone); + ZONEDB_LOCK(&zone->dblock, isc_rwlocktype_read); + dns_db_currentversion(zone->db, &version); + result = dns_master_dumpinc2(zone->mctx, zone->db, version, + &dns_master_style_default, + zone->masterfile, zone->task, dump_done, + zone, &zone->dctx, zone->masterformat); + dns_db_closeversion(zone->db, &version, ISC_FALSE); + ZONEDB_UNLOCK(&zone->dblock, isc_rwlocktype_read); + UNLOCK_ZONE(zone); + if (result != DNS_R_CONTINUE) + goto fail; + return; + + fail: + dump_done(zone, result); +} + +static isc_result_t +zone_startload(dns_db_t *db, dns_zone_t *zone, isc_time_t loadtime) { + dns_load_t *load; + isc_result_t result; + isc_result_t tresult; + unsigned int options; + + options = DNS_MASTER_ZONE; + if (DNS_ZONE_OPTION(zone, DNS_ZONEOPT_MANYERRORS)) + options |= DNS_MASTER_MANYERRORS; + if (DNS_ZONE_OPTION(zone, DNS_ZONEOPT_CHECKNS)) + options |= DNS_MASTER_CHECKNS; + if (DNS_ZONE_OPTION(zone, DNS_ZONEOPT_FATALNS)) + options |= DNS_MASTER_FATALNS; + if (zone->type == dns_zone_slave) + options |= DNS_MASTER_SLAVE; + if (DNS_ZONE_OPTION(zone, DNS_ZONEOPT_CHECKNAMES)) + options |= DNS_MASTER_CHECKNAMES; + if (DNS_ZONE_OPTION(zone, DNS_ZONEOPT_CHECKNAMESFAIL)) + options |= DNS_MASTER_CHECKNAMESFAIL; + if (DNS_ZONE_OPTION(zone, DNS_ZONEOPT_CHECKMX)) + options |= DNS_MASTER_CHECKMX; + if (DNS_ZONE_OPTION(zone, DNS_ZONEOPT_CHECKMXFAIL)) + options |= DNS_MASTER_CHECKMXFAIL; + if (DNS_ZONE_OPTION(zone, DNS_ZONEOPT_CHECKWILDCARD)) + options |= DNS_MASTER_CHECKWILDCARD; + + if (zone->zmgr != NULL && zone->db != NULL && zone->task != NULL) { + load = isc_mem_get(zone->mctx, sizeof(*load)); + if (load == NULL) + return (ISC_R_NOMEMORY); + + load->mctx = NULL; + load->zone = NULL; + load->db = NULL; + load->loadtime = loadtime; + load->magic = LOAD_MAGIC; + + isc_mem_attach(zone->mctx, &load->mctx); + zone_iattach(zone, &load->zone); + dns_db_attach(db, &load->db); + dns_rdatacallbacks_init(&load->callbacks); + result = dns_db_beginload(db, &load->callbacks.add, + &load->callbacks.add_private); + if (result != ISC_R_SUCCESS) + goto cleanup; + result = zonemgr_getio(zone->zmgr, ISC_TRUE, zone->task, + zone_gotreadhandle, load, + &zone->readio); + if (result != ISC_R_SUCCESS) { + /* + * We can't report multiple errors so ignore + * the result of dns_db_endload(). + */ + (void)dns_db_endload(load->db, + &load->callbacks.add_private); + goto cleanup; + } else + result = DNS_R_CONTINUE; + } else { + dns_rdatacallbacks_t callbacks; + + dns_rdatacallbacks_init(&callbacks); + result = dns_db_beginload(db, &callbacks.add, + &callbacks.add_private); + if (result != ISC_R_SUCCESS) + return (result); + result = dns_master_loadfile2(zone->masterfile, &zone->origin, + &zone->origin, zone->rdclass, + options, &callbacks, zone->mctx, + zone->masterformat); + tresult = dns_db_endload(db, &callbacks.add_private); + if (result == ISC_R_SUCCESS) + result = tresult; + } + + return (result); + + cleanup: + load->magic = 0; + dns_db_detach(&load->db); + zone_idetach(&load->zone); + isc_mem_detach(&load->mctx); + isc_mem_put(zone->mctx, load, sizeof(*load)); + return (result); +} + +static isc_boolean_t +zone_check_mx(dns_zone_t *zone, dns_db_t *db, dns_name_t *name, + dns_name_t *owner) +{ + isc_result_t result; + char ownerbuf[DNS_NAME_FORMATSIZE]; + char namebuf[DNS_NAME_FORMATSIZE]; + char altbuf[DNS_NAME_FORMATSIZE]; + dns_fixedname_t fixed; + dns_name_t *foundname; + int level; + + /* + * Outside of zone. + */ + if (!dns_name_issubdomain(name, &zone->origin)) { + if (zone->checkmx != NULL) + return ((zone->checkmx)(zone, name, owner)); + return (ISC_TRUE); + } + + if (zone->type == dns_zone_master) + level = ISC_LOG_ERROR; + else + level = ISC_LOG_WARNING; + + dns_fixedname_init(&fixed); + foundname = dns_fixedname_name(&fixed); + + result = dns_db_find(db, name, NULL, dns_rdatatype_a, + 0, 0, NULL, foundname, NULL, NULL); + if (result == ISC_R_SUCCESS) + return (ISC_TRUE); + + if (result == DNS_R_NXRRSET) { + result = dns_db_find(db, name, NULL, dns_rdatatype_aaaa, + 0, 0, NULL, foundname, NULL, NULL); + if (result == ISC_R_SUCCESS) + return (ISC_TRUE); + } + + dns_name_format(owner, ownerbuf, sizeof ownerbuf); + dns_name_format(name, namebuf, sizeof namebuf); + if (result == DNS_R_NXRRSET || result == DNS_R_NXDOMAIN || + result == DNS_R_EMPTYNAME) { + dns_zone_log(zone, level, + "%s/MX '%s' has no address records (A or AAAA)", + ownerbuf, namebuf); + /* XXX950 make fatal for 9.5.0. */ + return (ISC_TRUE); + } + + if (result == DNS_R_CNAME) { + if (DNS_ZONE_OPTION(zone, DNS_ZONEOPT_WARNMXCNAME) || + DNS_ZONE_OPTION(zone, DNS_ZONEOPT_IGNOREMXCNAME)) + level = ISC_LOG_WARNING; + if (!DNS_ZONE_OPTION(zone, DNS_ZONEOPT_IGNOREMXCNAME)) + dns_zone_log(zone, level, + "%s/MX '%s' is a CNAME (illegal)", + ownerbuf, namebuf); + return ((level == ISC_LOG_WARNING) ? ISC_TRUE : ISC_FALSE); + } + + if (result == DNS_R_DNAME) { + if (DNS_ZONE_OPTION(zone, DNS_ZONEOPT_WARNMXCNAME) || + DNS_ZONE_OPTION(zone, DNS_ZONEOPT_IGNOREMXCNAME)) + level = ISC_LOG_WARNING; + if (!DNS_ZONE_OPTION(zone, DNS_ZONEOPT_IGNOREMXCNAME)) { + dns_name_format(foundname, altbuf, sizeof altbuf); + dns_zone_log(zone, level, "%s/MX '%s' is below a DNAME" + " '%s' (illegal)", ownerbuf, namebuf, + altbuf); + } + return ((level == ISC_LOG_WARNING) ? ISC_TRUE : ISC_FALSE); + } + + if (zone->checkmx != NULL && result == DNS_R_DELEGATION) + return ((zone->checkmx)(zone, name, owner)); + + return (ISC_TRUE); +} + +static isc_boolean_t +zone_check_srv(dns_zone_t *zone, dns_db_t *db, dns_name_t *name, + dns_name_t *owner) +{ + isc_result_t result; + char ownerbuf[DNS_NAME_FORMATSIZE]; + char namebuf[DNS_NAME_FORMATSIZE]; + char altbuf[DNS_NAME_FORMATSIZE]; + dns_fixedname_t fixed; + dns_name_t *foundname; + int level; + + /* + * "." means the services does not exist. + */ + if (dns_name_equal(name, dns_rootname)) + return (ISC_TRUE); + + /* + * Outside of zone. + */ + if (!dns_name_issubdomain(name, &zone->origin)) { + if (zone->checksrv != NULL) + return ((zone->checksrv)(zone, name, owner)); + return (ISC_TRUE); + } + + if (zone->type == dns_zone_master) + level = ISC_LOG_ERROR; + else + level = ISC_LOG_WARNING; + + dns_fixedname_init(&fixed); + foundname = dns_fixedname_name(&fixed); + + result = dns_db_find(db, name, NULL, dns_rdatatype_a, + 0, 0, NULL, foundname, NULL, NULL); + if (result == ISC_R_SUCCESS) + return (ISC_TRUE); + + if (result == DNS_R_NXRRSET) { + result = dns_db_find(db, name, NULL, dns_rdatatype_aaaa, + 0, 0, NULL, foundname, NULL, NULL); + if (result == ISC_R_SUCCESS) + return (ISC_TRUE); + } + + dns_name_format(owner, ownerbuf, sizeof ownerbuf); + dns_name_format(name, namebuf, sizeof namebuf); + if (result == DNS_R_NXRRSET || result == DNS_R_NXDOMAIN || + result == DNS_R_EMPTYNAME) { + dns_zone_log(zone, level, + "%s/SRV '%s' has no address records (A or AAAA)", + ownerbuf, namebuf); + /* XXX950 make fatal for 9.5.0. */ + return (ISC_TRUE); + } + + if (result == DNS_R_CNAME) { + if (DNS_ZONE_OPTION(zone, DNS_ZONEOPT_WARNSRVCNAME) || + DNS_ZONE_OPTION(zone, DNS_ZONEOPT_IGNORESRVCNAME)) + level = ISC_LOG_WARNING; + if (!DNS_ZONE_OPTION(zone, DNS_ZONEOPT_IGNORESRVCNAME)) + dns_zone_log(zone, level, + "%s/SRV '%s' is a CNAME (illegal)", + ownerbuf, namebuf); + return ((level == ISC_LOG_WARNING) ? ISC_TRUE : ISC_FALSE); + } + + if (result == DNS_R_DNAME) { + if (DNS_ZONE_OPTION(zone, DNS_ZONEOPT_WARNSRVCNAME) || + DNS_ZONE_OPTION(zone, DNS_ZONEOPT_IGNORESRVCNAME)) + level = ISC_LOG_WARNING; + if (!DNS_ZONE_OPTION(zone, DNS_ZONEOPT_IGNORESRVCNAME)) { + dns_name_format(foundname, altbuf, sizeof altbuf); + dns_zone_log(zone, level, "%s/SRV '%s' is below a " + "DNAME '%s' (illegal)", ownerbuf, namebuf, + altbuf); + } + return ((level == ISC_LOG_WARNING) ? ISC_TRUE : ISC_FALSE); + } + + if (zone->checksrv != NULL && result == DNS_R_DELEGATION) + return ((zone->checksrv)(zone, name, owner)); + + return (ISC_TRUE); +} + +static isc_boolean_t +zone_check_glue(dns_zone_t *zone, dns_db_t *db, dns_name_t *name, + dns_name_t *owner) +{ + isc_boolean_t answer = ISC_TRUE; + isc_result_t result, tresult; + char ownerbuf[DNS_NAME_FORMATSIZE]; + char namebuf[DNS_NAME_FORMATSIZE]; + char altbuf[DNS_NAME_FORMATSIZE]; + dns_fixedname_t fixed; + dns_name_t *foundname; + dns_rdataset_t a; + dns_rdataset_t aaaa; + int level; + + /* + * Outside of zone. + */ + if (!dns_name_issubdomain(name, &zone->origin)) { + if (zone->checkns != NULL) + return ((zone->checkns)(zone, name, owner, NULL, NULL)); + return (ISC_TRUE); + } + + if (zone->type == dns_zone_master) + level = ISC_LOG_ERROR; + else + level = ISC_LOG_WARNING; + + dns_fixedname_init(&fixed); + foundname = dns_fixedname_name(&fixed); + dns_rdataset_init(&a); + dns_rdataset_init(&aaaa); + + result = dns_db_find(db, name, NULL, dns_rdatatype_a, + DNS_DBFIND_GLUEOK, 0, NULL, + foundname, &a, NULL); + + if (result == ISC_R_SUCCESS) { + dns_rdataset_disassociate(&a); + return (ISC_TRUE); + } else if (result == DNS_R_DELEGATION) + dns_rdataset_disassociate(&a); + + if (result == DNS_R_NXRRSET || result == DNS_R_DELEGATION || + result == DNS_R_GLUE) { + tresult = dns_db_find(db, name, NULL, dns_rdatatype_aaaa, + DNS_DBFIND_GLUEOK, 0, NULL, + foundname, &aaaa, NULL); + if (tresult == ISC_R_SUCCESS) { + dns_rdataset_disassociate(&aaaa); + return (ISC_TRUE); + } + if (tresult == DNS_R_DELEGATION) + dns_rdataset_disassociate(&aaaa); + if (result == DNS_R_GLUE || tresult == DNS_R_GLUE) { + /* + * Check glue against child zone. + */ + if (zone->checkns != NULL) + answer = (zone->checkns)(zone, name, owner, + &a, &aaaa); + if (dns_rdataset_isassociated(&a)) + dns_rdataset_disassociate(&a); + if (dns_rdataset_isassociated(&aaaa)) + dns_rdataset_disassociate(&aaaa); + return (answer); + } + } else + tresult = result; + + dns_name_format(owner, ownerbuf, sizeof ownerbuf); + dns_name_format(name, namebuf, sizeof namebuf); + if (result == DNS_R_NXRRSET || result == DNS_R_NXDOMAIN || + result == DNS_R_EMPTYNAME || result == DNS_R_DELEGATION) { + const char *what; + if (dns_name_issubdomain(name, owner)) + what = "REQUIRED GLUE "; + else if (result == DNS_R_DELEGATION) + what = "SIBLING GLUE "; + else + what = ""; + + if (result != DNS_R_DELEGATION || + DNS_ZONE_OPTION(zone, DNS_ZONEOPT_CHECKSIBLING)) { + dns_zone_log(zone, level, "%s/NS '%s' has no %s" + "address records (A or AAAA)", + ownerbuf, namebuf, what); + /* + * Log missing address record. + */ + if (result == DNS_R_DELEGATION && zone->checkns != NULL) + (void)(zone->checkns)(zone, name, owner, + &a, &aaaa); + /* XXX950 make fatal for 9.5.0. */ + /* answer = ISC_FALSE; */ + } + } else if (result == DNS_R_CNAME) { + dns_zone_log(zone, level, "%s/NS '%s' is a CNAME (illegal)", + ownerbuf, namebuf); + /* XXX950 make fatal for 9.5.0. */ + /* answer = ISC_FALSE; */ + } else if (result == DNS_R_DNAME) { + dns_name_format(foundname, altbuf, sizeof altbuf); + dns_zone_log(zone, level, + "%s/NS '%s' is below a DNAME '%s' (illegal)", + ownerbuf, namebuf, altbuf); + /* XXX950 make fatal for 9.5.0. */ + /* answer = ISC_FALSE; */ + } + + if (dns_rdataset_isassociated(&a)) + dns_rdataset_disassociate(&a); + if (dns_rdataset_isassociated(&aaaa)) + dns_rdataset_disassociate(&aaaa); + return (answer); +} + +static isc_boolean_t +integrity_checks(dns_zone_t *zone, dns_db_t *db) { + dns_dbiterator_t *dbiterator = NULL; + dns_dbnode_t *node = NULL; + dns_rdataset_t rdataset; + dns_fixedname_t fixed; + dns_fixedname_t fixedbottom; + dns_rdata_mx_t mx; + dns_rdata_ns_t ns; + dns_rdata_in_srv_t srv; + dns_rdata_t rdata; + dns_name_t *name; + dns_name_t *bottom; + isc_result_t result; + isc_boolean_t ok = ISC_TRUE; + + dns_fixedname_init(&fixed); + name = dns_fixedname_name(&fixed); + dns_fixedname_init(&fixedbottom); + bottom = dns_fixedname_name(&fixedbottom); + dns_rdataset_init(&rdataset); + dns_rdata_init(&rdata); + + result = dns_db_createiterator(db, ISC_FALSE, &dbiterator); + if (result != ISC_R_SUCCESS) + return (ISC_TRUE); + + result = dns_dbiterator_first(dbiterator); + while (result == ISC_R_SUCCESS) { + result = dns_dbiterator_current(dbiterator, &node, name); + if (result != ISC_R_SUCCESS) + goto cleanup; + + /* + * Is this name visible in the zone? + */ + if (!dns_name_issubdomain(name, &zone->origin) || + (dns_name_countlabels(bottom) > 0 && + dns_name_issubdomain(name, bottom))) + goto next; + + /* + * Don't check the NS records at the origin. + */ + if (dns_name_equal(name, &zone->origin)) + goto checkmx; + + result = dns_db_findrdataset(db, node, NULL, dns_rdatatype_ns, + 0, 0, &rdataset, NULL); + if (result != ISC_R_SUCCESS) + goto checkmx; + /* + * Remember bottom of zone. + */ + dns_name_copy(name, bottom, NULL); + + result = dns_rdataset_first(&rdataset); + while (result == ISC_R_SUCCESS) { + dns_rdataset_current(&rdataset, &rdata); + result = dns_rdata_tostruct(&rdata, &ns, NULL); + RUNTIME_CHECK(result == ISC_R_SUCCESS); + if (!zone_check_glue(zone, db, &ns.name, name)) + ok = ISC_FALSE; + dns_rdata_reset(&rdata); + result = dns_rdataset_next(&rdataset); + } + dns_rdataset_disassociate(&rdataset); + + checkmx: + result = dns_db_findrdataset(db, node, NULL, dns_rdatatype_mx, + 0, 0, &rdataset, NULL); + if (result != ISC_R_SUCCESS) + goto checksrv; + result = dns_rdataset_first(&rdataset); + while (result == ISC_R_SUCCESS) { + dns_rdataset_current(&rdataset, &rdata); + result = dns_rdata_tostruct(&rdata, &mx, NULL); + RUNTIME_CHECK(result == ISC_R_SUCCESS); + if (!zone_check_mx(zone, db, &mx.mx, name)) + ok = ISC_FALSE; + dns_rdata_reset(&rdata); + result = dns_rdataset_next(&rdataset); + } + dns_rdataset_disassociate(&rdataset); + + checksrv: + if (zone->rdclass != dns_rdataclass_in) + goto next; + result = dns_db_findrdataset(db, node, NULL, dns_rdatatype_srv, + 0, 0, &rdataset, NULL); + if (result != ISC_R_SUCCESS) + goto next; + result = dns_rdataset_first(&rdataset); + while (result == ISC_R_SUCCESS) { + dns_rdataset_current(&rdataset, &rdata); + result = dns_rdata_tostruct(&rdata, &srv, NULL); + RUNTIME_CHECK(result == ISC_R_SUCCESS); + if (!zone_check_srv(zone, db, &srv.target, name)) + ok = ISC_FALSE; + dns_rdata_reset(&rdata); + result = dns_rdataset_next(&rdataset); + } + dns_rdataset_disassociate(&rdataset); + + next: + dns_db_detachnode(db, &node); + result = dns_dbiterator_next(dbiterator); + } + + cleanup: + if (node != NULL) + dns_db_detachnode(db, &node); + dns_dbiterator_destroy(&dbiterator); + + return (ok); +} + +/* + * OpenSSL verification of RSA keys with exponent 3 is known to be + * broken prior OpenSSL 0.9.8c/0.9.7k. Look for such keys and warn + * if they are in use. + */ +static void +zone_check_dnskeys(dns_zone_t *zone, dns_db_t *db) { + dns_dbnode_t *node = NULL; + dns_dbversion_t *version = NULL; + dns_rdata_dnskey_t dnskey; + dns_rdata_t rdata = DNS_RDATA_INIT; + dns_rdataset_t rdataset; + isc_result_t result; + isc_boolean_t logit, foundrsa = ISC_FALSE, foundmd5 = ISC_FALSE; + const char *algorithm; + + result = dns_db_findnode(db, &zone->origin, ISC_FALSE, &node); + if (result != ISC_R_SUCCESS) + goto cleanup; + + dns_db_currentversion(db, &version); + dns_rdataset_init(&rdataset); + result = dns_db_findrdataset(db, node, version, dns_rdatatype_dnskey, + dns_rdatatype_none, 0, &rdataset, NULL); + if (result != ISC_R_SUCCESS) + goto cleanup; + + for (result = dns_rdataset_first(&rdataset); + result == ISC_R_SUCCESS; + result = dns_rdataset_next(&rdataset)) + { + dns_rdataset_current(&rdataset, &rdata); + result = dns_rdata_tostruct(&rdata, &dnskey, NULL); + INSIST(result == ISC_R_SUCCESS); + + if ((dnskey.algorithm == DST_ALG_RSASHA1 || + dnskey.algorithm == DST_ALG_RSAMD5) && + dnskey.datalen > 1 && dnskey.data[0] == 1 && + dnskey.data[1] == 3) + { + if (dnskey.algorithm == DST_ALG_RSASHA1) { + logit = !foundrsa; + foundrsa = ISC_TRUE; + algorithm = "RSASHA1"; + } else { + logit = !foundmd5; + foundmd5 = ISC_TRUE; + algorithm = "RSAMD5"; + } + if (logit) + dns_zone_log(zone, ISC_LOG_WARNING, + "weak %s (%u) key found " + "(exponent=3)", algorithm, + dnskey.algorithm); + if (foundrsa && foundmd5) + break; + } + dns_rdata_reset(&rdata); + } + dns_rdataset_disassociate(&rdataset); + + cleanup: + if (node != NULL) + dns_db_detachnode(db, &node); + if (version != NULL) + dns_db_closeversion(db, &version, ISC_FALSE); + +} + +static isc_result_t +zone_postload(dns_zone_t *zone, dns_db_t *db, isc_time_t loadtime, + isc_result_t result) +{ + unsigned int soacount = 0; + unsigned int nscount = 0; + unsigned int errors = 0; + isc_uint32_t serial, refresh, retry, expire, minimum; + isc_time_t now; + isc_boolean_t needdump = ISC_FALSE; + isc_boolean_t hasinclude = DNS_ZONE_FLAG(zone, DNS_ZONEFLG_HASINCLUDE); + + TIME_NOW(&now); + + /* + * Initiate zone transfer? We may need a error code that + * indicates that the "permanent" form does not exist. + * XXX better error feedback to log. + */ + if (result != ISC_R_SUCCESS && result != DNS_R_SEENINCLUDE) { + if (zone->type == dns_zone_slave || + zone->type == dns_zone_stub) { + if (result == ISC_R_FILENOTFOUND) + dns_zone_log(zone, ISC_LOG_DEBUG(1), + "no master file"); + else if (result != DNS_R_NOMASTERFILE) + dns_zone_log(zone, ISC_LOG_ERROR, + "loading from master file %s " + "failed: %s", + zone->masterfile, + dns_result_totext(result)); + } else + dns_zone_log(zone, ISC_LOG_ERROR, + "loading from master file %s failed: %s", + zone->masterfile, + dns_result_totext(result)); + goto cleanup; + } + + dns_zone_log(zone, ISC_LOG_DEBUG(2), + "number of nodes in database: %u", + dns_db_nodecount(db)); + + if (result == DNS_R_SEENINCLUDE) + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_HASINCLUDE); + else + DNS_ZONE_CLRFLAG(zone, DNS_ZONEFLG_HASINCLUDE); + + /* + * Apply update log, if any, on initial load. + */ + if (zone->journal != NULL && + ! DNS_ZONE_OPTION(zone, DNS_ZONEOPT_NOMERGE) && + ! DNS_ZONE_FLAG(zone, DNS_ZONEFLG_LOADED)) + { + result = dns_journal_rollforward(zone->mctx, db, + zone->journal); + if (result != ISC_R_SUCCESS && result != ISC_R_NOTFOUND && + result != DNS_R_UPTODATE && result != DNS_R_NOJOURNAL && + result != ISC_R_RANGE) { + dns_zone_log(zone, ISC_LOG_ERROR, + "journal rollforward failed: %s", + dns_result_totext(result)); + goto cleanup; + } + if (result == ISC_R_NOTFOUND || result == ISC_R_RANGE) { + dns_zone_log(zone, ISC_LOG_ERROR, + "journal rollforward failed: " + "journal out of sync with zone"); + goto cleanup; + } + dns_zone_log(zone, ISC_LOG_DEBUG(1), + "journal rollforward completed " + "successfully: %s", + dns_result_totext(result)); + if (result == ISC_R_SUCCESS) + needdump = ISC_TRUE; + } + + zone->loadtime = loadtime; + + dns_zone_log(zone, ISC_LOG_DEBUG(1), "loaded"); + + /* + * Obtain ns, soa and cname counts for top of zone. + */ + INSIST(db != NULL); + result = zone_get_from_db(zone, db, &nscount, &soacount, &serial, + &refresh, &retry, &expire, &minimum, + &errors); + if (result != ISC_R_SUCCESS) { + dns_zone_log(zone, ISC_LOG_ERROR, + "could not find NS and/or SOA records"); + } + + /* + * Master / Slave / Stub zones require both NS and SOA records at + * the top of the zone. + */ + + switch (zone->type) { + case dns_zone_master: + case dns_zone_slave: + case dns_zone_stub: + if (soacount != 1) { + dns_zone_log(zone, ISC_LOG_ERROR, + "has %d SOA records", soacount); + result = DNS_R_BADZONE; + } + if (nscount == 0) { + dns_zone_log(zone, ISC_LOG_ERROR, + "has no NS records"); + result = DNS_R_BADZONE; + } + if (result != ISC_R_SUCCESS) + goto cleanup; + if (zone->type == dns_zone_master && errors != 0) { + result = DNS_R_BADZONE; + goto cleanup; + } + if (zone->type == dns_zone_master && + DNS_ZONE_OPTION(zone, DNS_ZONEOPT_CHECKINTEGRITY) && + !integrity_checks(zone, db)) { + result = DNS_R_BADZONE; + goto cleanup; + } + + if (zone->db != NULL) { + /* + * This is checked in zone_replacedb() for slave zones + * as they don't reload from disk. + */ + if (DNS_ZONE_OPTION(zone, DNS_ZONEOPT_IXFRFROMDIFFS) && + !isc_serial_gt(serial, zone->serial)) { + isc_uint32_t serialmin, serialmax; + + INSIST(zone->type == dns_zone_master); + + serialmin = (zone->serial + 1) & 0xffffffffU; + serialmax = (zone->serial + 0x7fffffffU) & + 0xffffffffU; + dns_zone_log(zone, ISC_LOG_ERROR, + "ixfr-from-differences: " + "new serial (%u) out of range " + "[%u - %u]", serial, serialmin, + serialmax); + result = DNS_R_BADZONE; + goto cleanup; + } else if (!isc_serial_ge(serial, zone->serial)) + dns_zone_log(zone, ISC_LOG_ERROR, + "zone serial has gone backwards"); + else if (serial == zone->serial && !hasinclude) + dns_zone_log(zone, ISC_LOG_ERROR, + "zone serial unchanged. " + "zone may fail to transfer " + "to slaves."); + } + zone->serial = serial; + zone->refresh = RANGE(refresh, + zone->minrefresh, zone->maxrefresh); + zone->retry = RANGE(retry, + zone->minretry, zone->maxretry); + zone->expire = RANGE(expire, zone->refresh + zone->retry, + DNS_MAX_EXPIRE); + zone->minimum = minimum; + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_HAVETIMERS); + + if (zone->type == dns_zone_slave || + zone->type == dns_zone_stub) { + isc_time_t t; + isc_uint32_t delay; + + result = isc_file_getmodtime(zone->journal, &t); + if (result != ISC_R_SUCCESS) + result = isc_file_getmodtime(zone->masterfile, + &t); + if (result == ISC_R_SUCCESS) + DNS_ZONE_TIME_ADD(&t, zone->expire, + &zone->expiretime); + else + DNS_ZONE_TIME_ADD(&now, zone->retry, + &zone->expiretime); + + delay = isc_random_jitter(zone->retry, + (zone->retry * 3) / 4); + DNS_ZONE_TIME_ADD(&now, delay, &zone->refreshtime); + if (isc_time_compare(&zone->refreshtime, + &zone->expiretime) >= 0) + zone->refreshtime = now; + } + break; + default: + UNEXPECTED_ERROR(__FILE__, __LINE__, + "unexpected zone type %d", zone->type); + result = ISC_R_UNEXPECTED; + goto cleanup; + } + + /* + * Check for weak DNSKEY's. + */ + if (zone->type == dns_zone_master) + zone_check_dnskeys(zone, db); + +#if 0 + /* destroy notification example. */ + { + isc_event_t *e = isc_event_allocate(zone->mctx, NULL, + DNS_EVENT_DBDESTROYED, + dns_zonemgr_dbdestroyed, + zone, + sizeof(isc_event_t)); + dns_db_ondestroy(db, zone->task, &e); + } +#endif + + ZONEDB_LOCK(&zone->dblock, isc_rwlocktype_write); + if (zone->db != NULL) { + result = zone_replacedb(zone, db, ISC_FALSE); + ZONEDB_UNLOCK(&zone->dblock, isc_rwlocktype_write); + if (result != ISC_R_SUCCESS) + goto cleanup; + } else { + zone_attachdb(zone, db); + ZONEDB_UNLOCK(&zone->dblock, isc_rwlocktype_write); + DNS_ZONE_SETFLAG(zone, + DNS_ZONEFLG_LOADED|DNS_ZONEFLG_NEEDNOTIFY); + } + result = ISC_R_SUCCESS; + if (needdump) + zone_needdump(zone, DNS_DUMP_DELAY); + if (zone->task != NULL) + zone_settimer(zone, &now); + + if (! dns_db_ispersistent(db)) + dns_zone_log(zone, ISC_LOG_INFO, "loaded serial %u%s", + zone->serial, + dns_db_issecure(db) ? " (signed)" : ""); + + return (result); + + cleanup: + if (zone->type == dns_zone_slave || + zone->type == dns_zone_stub) { + if (zone->journal != NULL) + zone_saveunique(zone, zone->journal, "jn-XXXXXXXX"); + if (zone->masterfile != NULL) + zone_saveunique(zone, zone->masterfile, "db-XXXXXXXX"); + + /* Mark the zone for immediate refresh. */ + zone->refreshtime = now; + if (zone->task != NULL) + zone_settimer(zone, &now); + result = ISC_R_SUCCESS; + } + return (result); +} + +static isc_boolean_t +exit_check(dns_zone_t *zone) { + + REQUIRE(LOCKED_ZONE(zone)); + + if (DNS_ZONE_FLAG(zone, DNS_ZONEFLG_SHUTDOWN) && + zone->irefs == 0) + { + /* + * DNS_ZONEFLG_SHUTDOWN can only be set if erefs == 0. + */ + INSIST(isc_refcount_current(&zone->erefs) == 0); + return (ISC_TRUE); + } + return (ISC_FALSE); +} + +static isc_boolean_t +zone_check_ns(dns_zone_t *zone, dns_db_t *db, dns_name_t *name) { + isc_result_t result; + char namebuf[DNS_NAME_FORMATSIZE]; + char altbuf[DNS_NAME_FORMATSIZE]; + dns_fixedname_t fixed; + dns_name_t *foundname; + int level; + + if (DNS_ZONE_OPTION(zone, DNS_ZONEOPT_NOCHECKNS)) + return (ISC_TRUE); + + if (zone->type == dns_zone_master) + level = ISC_LOG_ERROR; + else + level = ISC_LOG_WARNING; + + dns_fixedname_init(&fixed); + foundname = dns_fixedname_name(&fixed); + + result = dns_db_find(db, name, NULL, dns_rdatatype_a, + 0, 0, NULL, foundname, NULL, NULL); + if (result == ISC_R_SUCCESS) + return (ISC_TRUE); + + if (result == DNS_R_NXRRSET) { + result = dns_db_find(db, name, NULL, dns_rdatatype_aaaa, + 0, 0, NULL, foundname, NULL, NULL); + if (result == ISC_R_SUCCESS) + return (ISC_TRUE); + } + + dns_name_format(name, namebuf, sizeof namebuf); + if (result == DNS_R_NXRRSET || result == DNS_R_NXDOMAIN || + result == DNS_R_EMPTYNAME) { + dns_zone_log(zone, level, + "NS '%s' has no address records (A or AAAA)", + namebuf); + /* XXX950 Make fatal ISC_FALSE for 9.5.0. */ + return (ISC_TRUE); + } + + if (result == DNS_R_CNAME) { + dns_zone_log(zone, level, "NS '%s' is a CNAME (illegal)", + namebuf); + /* XXX950 Make fatal ISC_FALSE for 9.5.0. */ + return (ISC_TRUE); + } + + if (result == DNS_R_DNAME) { + dns_name_format(foundname, altbuf, sizeof altbuf); + dns_zone_log(zone, level, + "NS '%s' is below a DNAME '%s' (illegal)", + namebuf, altbuf); + /* XXX950 Make fatal ISC_FALSE for 9.5.0. */ + return (ISC_TRUE); + } + + return (ISC_TRUE); +} + +static isc_result_t +zone_count_ns_rr(dns_zone_t *zone, dns_db_t *db, dns_dbnode_t *node, + dns_dbversion_t *version, unsigned int *nscount, + unsigned int *errors) +{ + isc_result_t result; + unsigned int count = 0; + unsigned int ecount = 0; + dns_rdataset_t rdataset; + dns_rdata_t rdata; + dns_rdata_ns_t ns; + + dns_rdataset_init(&rdataset); + result = dns_db_findrdataset(db, node, version, dns_rdatatype_ns, + dns_rdatatype_none, 0, &rdataset, NULL); + if (result == ISC_R_NOTFOUND) + goto success; + if (result != ISC_R_SUCCESS) + goto invalidate_rdataset; + + result = dns_rdataset_first(&rdataset); + while (result == ISC_R_SUCCESS) { + if (errors != NULL && zone->rdclass == dns_rdataclass_in && + (zone->type == dns_zone_master || + zone->type == dns_zone_slave)) { + dns_rdata_init(&rdata); + dns_rdataset_current(&rdataset, &rdata); + result = dns_rdata_tostruct(&rdata, &ns, NULL); + RUNTIME_CHECK(result == ISC_R_SUCCESS); + if (dns_name_issubdomain(&ns.name, &zone->origin) && + !zone_check_ns(zone, db, &ns.name)) + ecount++; + } + count++; + result = dns_rdataset_next(&rdataset); + } + dns_rdataset_disassociate(&rdataset); + + success: + if (nscount != NULL) + *nscount = count; + if (errors != NULL) + *errors = ecount; + + result = ISC_R_SUCCESS; + + invalidate_rdataset: + dns_rdataset_invalidate(&rdataset); + + return (result); +} + +static isc_result_t +zone_load_soa_rr(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version, + unsigned int *soacount, + isc_uint32_t *serial, isc_uint32_t *refresh, + isc_uint32_t *retry, isc_uint32_t *expire, + isc_uint32_t *minimum) +{ + isc_result_t result; + unsigned int count; + dns_rdataset_t rdataset; + dns_rdata_t rdata = DNS_RDATA_INIT; + dns_rdata_soa_t soa; + + dns_rdataset_init(&rdataset); + result = dns_db_findrdataset(db, node, version, dns_rdatatype_soa, + dns_rdatatype_none, 0, &rdataset, NULL); + if (result == ISC_R_NOTFOUND) { + if (soacount != NULL) + *soacount = 0; + if (serial != NULL) + *serial = 0; + if (refresh != NULL) + *refresh = 0; + if (retry != NULL) + *retry = 0; + if (expire != NULL) + *expire = 0; + if (minimum != NULL) + *minimum = 0; + result = ISC_R_SUCCESS; + goto invalidate_rdataset; + } + if (result != ISC_R_SUCCESS) + goto invalidate_rdataset; + + count = 0; + result = dns_rdataset_first(&rdataset); + while (result == ISC_R_SUCCESS) { + dns_rdata_init(&rdata); + dns_rdataset_current(&rdataset, &rdata); + count++; + if (count == 1) { + result = dns_rdata_tostruct(&rdata, &soa, NULL); + RUNTIME_CHECK(result == ISC_R_SUCCESS); + } + + result = dns_rdataset_next(&rdataset); + dns_rdata_reset(&rdata); + } + dns_rdataset_disassociate(&rdataset); + + if (soacount != NULL) + *soacount = count; + + if (count > 0) { + if (serial != NULL) + *serial = soa.serial; + if (refresh != NULL) + *refresh = soa.refresh; + if (retry != NULL) + *retry = soa.retry; + if (expire != NULL) + *expire = soa.expire; + if (minimum != NULL) + *minimum = soa.minimum; + } + + result = ISC_R_SUCCESS; + + invalidate_rdataset: + dns_rdataset_invalidate(&rdataset); + + return (result); +} + +/* + * zone must be locked. + */ +static isc_result_t +zone_get_from_db(dns_zone_t *zone, dns_db_t *db, unsigned int *nscount, + unsigned int *soacount, isc_uint32_t *serial, + isc_uint32_t *refresh, isc_uint32_t *retry, + isc_uint32_t *expire, isc_uint32_t *minimum, + unsigned int *errors) +{ + dns_dbversion_t *version; + isc_result_t result; + isc_result_t answer = ISC_R_SUCCESS; + dns_dbnode_t *node; + + REQUIRE(db != NULL); + REQUIRE(zone != NULL); + + version = NULL; + dns_db_currentversion(db, &version); + + node = NULL; + result = dns_db_findnode(db, &zone->origin, ISC_FALSE, &node); + if (result != ISC_R_SUCCESS) { + answer = result; + goto closeversion; + } + + if (nscount != NULL || errors != NULL) { + result = zone_count_ns_rr(zone, db, node, version, + nscount, errors); + if (result != ISC_R_SUCCESS) + answer = result; + } + + if (soacount != NULL || serial != NULL || refresh != NULL + || retry != NULL || expire != NULL || minimum != NULL) { + result = zone_load_soa_rr(db, node, version, soacount, + serial, refresh, retry, expire, + minimum); + if (result != ISC_R_SUCCESS) + answer = result; + } + + dns_db_detachnode(db, &node); + closeversion: + dns_db_closeversion(db, &version, ISC_FALSE); + + return (answer); +} + +void +dns_zone_attach(dns_zone_t *source, dns_zone_t **target) { + REQUIRE(DNS_ZONE_VALID(source)); + REQUIRE(target != NULL && *target == NULL); + isc_refcount_increment(&source->erefs, NULL); + *target = source; +} + +void +dns_zone_detach(dns_zone_t **zonep) { + dns_zone_t *zone; + unsigned int refs; + isc_boolean_t free_now = ISC_FALSE; + + REQUIRE(zonep != NULL && DNS_ZONE_VALID(*zonep)); + + zone = *zonep; + + isc_refcount_decrement(&zone->erefs, &refs); + + if (refs == 0) { + LOCK_ZONE(zone); + /* + * We just detached the last external reference. + */ + if (zone->task != NULL) { + /* + * This zone is being managed. Post + * its control event and let it clean + * up synchronously in the context of + * its task. + */ + isc_event_t *ev = &zone->ctlevent; + isc_task_send(zone->task, &ev); + } else { + /* + * This zone is not being managed; it has + * no task and can have no outstanding + * events. Free it immediately. + */ + /* + * Unmanaged zones should not have non-null views; + * we have no way of detaching from the view here + * without causing deadlock because this code is called + * with the view already locked. + */ + INSIST(zone->view == NULL); + free_now = ISC_TRUE; + } + UNLOCK_ZONE(zone); + } + *zonep = NULL; + if (free_now) + zone_free(zone); +} + +void +dns_zone_iattach(dns_zone_t *source, dns_zone_t **target) { + REQUIRE(DNS_ZONE_VALID(source)); + REQUIRE(target != NULL && *target == NULL); + LOCK_ZONE(source); + zone_iattach(source, target); + UNLOCK_ZONE(source); +} + +static void +zone_iattach(dns_zone_t *source, dns_zone_t **target) { + + /* + * 'source' locked by caller. + */ + REQUIRE(LOCKED_ZONE(source)); + REQUIRE(DNS_ZONE_VALID(source)); + REQUIRE(target != NULL && *target == NULL); + INSIST(source->irefs + isc_refcount_current(&source->erefs) > 0); + source->irefs++; + INSIST(source->irefs != 0); + *target = source; +} + +static void +zone_idetach(dns_zone_t **zonep) { + dns_zone_t *zone; + + /* + * 'zone' locked by caller. + */ + REQUIRE(zonep != NULL && DNS_ZONE_VALID(*zonep)); + zone = *zonep; + REQUIRE(LOCKED_ZONE(*zonep)); + *zonep = NULL; + + INSIST(zone->irefs > 0); + zone->irefs--; + INSIST(zone->irefs + isc_refcount_current(&zone->erefs) > 0); +} + +void +dns_zone_idetach(dns_zone_t **zonep) { + dns_zone_t *zone; + isc_boolean_t free_needed; + + REQUIRE(zonep != NULL && DNS_ZONE_VALID(*zonep)); + zone = *zonep; + *zonep = NULL; + + LOCK_ZONE(zone); + INSIST(zone->irefs > 0); + zone->irefs--; + free_needed = exit_check(zone); + UNLOCK_ZONE(zone); + if (free_needed) + zone_free(zone); +} + +isc_mem_t * +dns_zone_getmctx(dns_zone_t *zone) { + REQUIRE(DNS_ZONE_VALID(zone)); + + return (zone->mctx); +} + +dns_zonemgr_t * +dns_zone_getmgr(dns_zone_t *zone) { + REQUIRE(DNS_ZONE_VALID(zone)); + + return (zone->zmgr); +} + +void +dns_zone_setflag(dns_zone_t *zone, unsigned int flags, isc_boolean_t value) { + REQUIRE(DNS_ZONE_VALID(zone)); + + LOCK_ZONE(zone); + if (value) + DNS_ZONE_SETFLAG(zone, flags); + else + DNS_ZONE_CLRFLAG(zone, flags); + UNLOCK_ZONE(zone); +} + +void +dns_zone_setoption(dns_zone_t *zone, unsigned int option, isc_boolean_t value) +{ + REQUIRE(DNS_ZONE_VALID(zone)); + + LOCK_ZONE(zone); + if (value) + zone->options |= option; + else + zone->options &= ~option; + UNLOCK_ZONE(zone); +} + +unsigned int +dns_zone_getoptions(dns_zone_t *zone) { + + REQUIRE(DNS_ZONE_VALID(zone)); + + return (zone->options); +} + +isc_result_t +dns_zone_setxfrsource4(dns_zone_t *zone, const isc_sockaddr_t *xfrsource) { + REQUIRE(DNS_ZONE_VALID(zone)); + + LOCK_ZONE(zone); + zone->xfrsource4 = *xfrsource; + UNLOCK_ZONE(zone); + + return (ISC_R_SUCCESS); +} + +isc_sockaddr_t * +dns_zone_getxfrsource4(dns_zone_t *zone) { + REQUIRE(DNS_ZONE_VALID(zone)); + return (&zone->xfrsource4); +} + +isc_result_t +dns_zone_setxfrsource6(dns_zone_t *zone, const isc_sockaddr_t *xfrsource) { + REQUIRE(DNS_ZONE_VALID(zone)); + + LOCK_ZONE(zone); + zone->xfrsource6 = *xfrsource; + UNLOCK_ZONE(zone); + + return (ISC_R_SUCCESS); +} + +isc_sockaddr_t * +dns_zone_getxfrsource6(dns_zone_t *zone) { + REQUIRE(DNS_ZONE_VALID(zone)); + return (&zone->xfrsource6); +} + +isc_result_t +dns_zone_setaltxfrsource4(dns_zone_t *zone, + const isc_sockaddr_t *altxfrsource) +{ + REQUIRE(DNS_ZONE_VALID(zone)); + + LOCK_ZONE(zone); + zone->altxfrsource4 = *altxfrsource; + UNLOCK_ZONE(zone); + + return (ISC_R_SUCCESS); +} + +isc_sockaddr_t * +dns_zone_getaltxfrsource4(dns_zone_t *zone) { + REQUIRE(DNS_ZONE_VALID(zone)); + return (&zone->altxfrsource4); +} + +isc_result_t +dns_zone_setaltxfrsource6(dns_zone_t *zone, + const isc_sockaddr_t *altxfrsource) +{ + REQUIRE(DNS_ZONE_VALID(zone)); + + LOCK_ZONE(zone); + zone->altxfrsource6 = *altxfrsource; + UNLOCK_ZONE(zone); + + return (ISC_R_SUCCESS); +} + +isc_sockaddr_t * +dns_zone_getaltxfrsource6(dns_zone_t *zone) { + REQUIRE(DNS_ZONE_VALID(zone)); + return (&zone->altxfrsource6); +} + +isc_result_t +dns_zone_setnotifysrc4(dns_zone_t *zone, const isc_sockaddr_t *notifysrc) { + REQUIRE(DNS_ZONE_VALID(zone)); + + LOCK_ZONE(zone); + zone->notifysrc4 = *notifysrc; + UNLOCK_ZONE(zone); + + return (ISC_R_SUCCESS); +} + +isc_sockaddr_t * +dns_zone_getnotifysrc4(dns_zone_t *zone) { + REQUIRE(DNS_ZONE_VALID(zone)); + return (&zone->notifysrc4); +} + +isc_result_t +dns_zone_setnotifysrc6(dns_zone_t *zone, const isc_sockaddr_t *notifysrc) { + REQUIRE(DNS_ZONE_VALID(zone)); + + LOCK_ZONE(zone); + zone->notifysrc6 = *notifysrc; + UNLOCK_ZONE(zone); + + return (ISC_R_SUCCESS); +} + +isc_sockaddr_t * +dns_zone_getnotifysrc6(dns_zone_t *zone) { + REQUIRE(DNS_ZONE_VALID(zone)); + return (&zone->notifysrc6); +} + +isc_result_t +dns_zone_setalsonotify(dns_zone_t *zone, const isc_sockaddr_t *notify, + isc_uint32_t count) +{ + isc_sockaddr_t *new; + + REQUIRE(DNS_ZONE_VALID(zone)); + REQUIRE(count == 0 || notify != NULL); + + LOCK_ZONE(zone); + if (zone->notify != NULL) { + isc_mem_put(zone->mctx, zone->notify, + zone->notifycnt * sizeof(*new)); + zone->notify = NULL; + zone->notifycnt = 0; + } + if (count != 0) { + new = isc_mem_get(zone->mctx, count * sizeof(*new)); + if (new == NULL) { + UNLOCK_ZONE(zone); + return (ISC_R_NOMEMORY); + } + memcpy(new, notify, count * sizeof(*new)); + zone->notify = new; + zone->notifycnt = count; + } + UNLOCK_ZONE(zone); + return (ISC_R_SUCCESS); +} + +isc_result_t +dns_zone_setmasters(dns_zone_t *zone, const isc_sockaddr_t *masters, + isc_uint32_t count) +{ + isc_result_t result; + + result = dns_zone_setmasterswithkeys(zone, masters, NULL, count); + return (result); +} + +static isc_boolean_t +same_masters(const isc_sockaddr_t *old, const isc_sockaddr_t *new, + isc_uint32_t count) +{ + unsigned int i; + + for (i = 0; i < count; i++) + if (!isc_sockaddr_equal(&old[i], &new[i])) + return (ISC_FALSE); + return (ISC_TRUE); +} + +static isc_boolean_t +same_keynames(dns_name_t **old, dns_name_t **new, isc_uint32_t count) { + unsigned int i; + + if (old == NULL && new == NULL) + return (ISC_TRUE); + if (old == NULL || new == NULL) + return (ISC_FALSE); + + for (i = 0; i < count; i++) { + if (old[i] == NULL && new[i] == NULL) + continue; + if (old[i] == NULL || new[i] == NULL || + !dns_name_equal(old[i], new[i])) + return (ISC_FALSE); + } + return (ISC_TRUE); +} + +isc_result_t +dns_zone_setmasterswithkeys(dns_zone_t *zone, + const isc_sockaddr_t *masters, + dns_name_t **keynames, + isc_uint32_t count) +{ + isc_sockaddr_t *new; + isc_result_t result = ISC_R_SUCCESS; + dns_name_t **newname; + isc_boolean_t *newok; + unsigned int i; + + REQUIRE(DNS_ZONE_VALID(zone)); + REQUIRE(count == 0 || masters != NULL); + if (keynames != NULL) { + REQUIRE(count != 0); + } + + LOCK_ZONE(zone); + /* + * The refresh code assumes that 'masters' wouldn't change under it. + * If it will change then kill off any current refresh in progress + * and update the masters info. If it won't change then we can just + * unlock and exit. + */ + if (count != zone->masterscnt || + !same_masters(zone->masters, masters, count) || + !same_keynames(zone->masterkeynames, keynames, count)) { + if (zone->request != NULL) + dns_request_cancel(zone->request); + } else + goto unlock; + if (zone->masters != NULL) { + isc_mem_put(zone->mctx, zone->masters, + zone->masterscnt * sizeof(*new)); + zone->masters = NULL; + } + if (zone->masterkeynames != NULL) { + for (i = 0; i < zone->masterscnt; i++) { + if (zone->masterkeynames[i] != NULL) { + dns_name_free(zone->masterkeynames[i], + zone->mctx); + isc_mem_put(zone->mctx, + zone->masterkeynames[i], + sizeof(dns_name_t)); + zone->masterkeynames[i] = NULL; + } + } + isc_mem_put(zone->mctx, zone->masterkeynames, + zone->masterscnt * sizeof(dns_name_t *)); + zone->masterkeynames = NULL; + } + if (zone->mastersok != NULL) { + isc_mem_put(zone->mctx, zone->mastersok, + zone->masterscnt * sizeof(isc_boolean_t)); + zone->mastersok = NULL; + } + zone->masterscnt = 0; + /* + * If count == 0, don't allocate any space for masters, mastersok or + * keynames so internally, those pointers are NULL if count == 0 + */ + if (count == 0) + goto unlock; + + /* + * masters must countain count elements! + */ + new = isc_mem_get(zone->mctx, count * sizeof(*new)); + if (new == NULL) { + result = ISC_R_NOMEMORY; + goto unlock; + } + memcpy(new, masters, count * sizeof(*new)); + + /* + * Similarly for mastersok. + */ + newok = isc_mem_get(zone->mctx, count * sizeof(*newok)); + if (newok == NULL) { + result = ISC_R_NOMEMORY; + isc_mem_put(zone->mctx, new, count * sizeof(*new)); + goto unlock; + }; + for (i = 0; i < count; i++) + newok[i] = ISC_FALSE; + + /* + * if keynames is non-NULL, it must contain count elements! + */ + newname = NULL; + if (keynames != NULL) { + newname = isc_mem_get(zone->mctx, count * sizeof(*newname)); + if (newname == NULL) { + result = ISC_R_NOMEMORY; + isc_mem_put(zone->mctx, new, count * sizeof(*new)); + isc_mem_put(zone->mctx, newok, count * sizeof(*newok)); + goto unlock; + } + for (i = 0; i < count; i++) + newname[i] = NULL; + for (i = 0; i < count; i++) { + if (keynames[i] != NULL) { + newname[i] = isc_mem_get(zone->mctx, + sizeof(dns_name_t)); + if (newname[i] == NULL) + goto allocfail; + dns_name_init(newname[i], NULL); + result = dns_name_dup(keynames[i], zone->mctx, + newname[i]); + if (result != ISC_R_SUCCESS) { + allocfail: + for (i = 0; i < count; i++) + if (newname[i] != NULL) + dns_name_free( + newname[i], + zone->mctx); + isc_mem_put(zone->mctx, new, + count * sizeof(*new)); + isc_mem_put(zone->mctx, newok, + count * sizeof(*newok)); + isc_mem_put(zone->mctx, newname, + count * sizeof(*newname)); + goto unlock; + } + } + } + } + + /* + * Everything is ok so attach to the zone. + */ + zone->masters = new; + zone->mastersok = newok; + zone->masterkeynames = newname; + zone->masterscnt = count; + DNS_ZONE_CLRFLAG(zone, DNS_ZONEFLG_NOMASTERS); + + unlock: + UNLOCK_ZONE(zone); + return (result); +} + +isc_result_t +dns_zone_getdb(dns_zone_t *zone, dns_db_t **dpb) { + isc_result_t result = ISC_R_SUCCESS; + + REQUIRE(DNS_ZONE_VALID(zone)); + + ZONEDB_LOCK(&zone->dblock, isc_rwlocktype_read); + if (zone->db == NULL) + result = DNS_R_NOTLOADED; + else + dns_db_attach(zone->db, dpb); + ZONEDB_UNLOCK(&zone->dblock, isc_rwlocktype_read); + + return (result); +} + +/* + * Co-ordinates the starting of routine jobs. + */ + +void +dns_zone_maintenance(dns_zone_t *zone) { + const char me[] = "dns_zone_maintenance"; + isc_time_t now; + + REQUIRE(DNS_ZONE_VALID(zone)); + ENTER; + + LOCK_ZONE(zone); + TIME_NOW(&now); + zone_settimer(zone, &now); + UNLOCK_ZONE(zone); +} + +static inline isc_boolean_t +was_dumping(dns_zone_t *zone) { + isc_boolean_t dumping; + + REQUIRE(LOCKED_ZONE(zone)); + + dumping = DNS_ZONE_FLAG(zone, DNS_ZONEFLG_DUMPING); + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_DUMPING); + if (!dumping) { + DNS_ZONE_CLRFLAG(zone, DNS_ZONEFLG_NEEDDUMP); + isc_time_settoepoch(&zone->dumptime); + } + return (dumping); +} + +static void +zone_maintenance(dns_zone_t *zone) { + const char me[] = "zone_maintenance"; + isc_time_t now; + isc_result_t result; + isc_boolean_t dumping; + + REQUIRE(DNS_ZONE_VALID(zone)); + ENTER; + + /* + * Configuring the view of this zone may have + * failed, for example because the config file + * had a syntax error. In that case, the view + * adb or resolver, and we had better not try + * to do maintenance on it. + */ + if (zone->view == NULL || zone->view->adb == NULL) + return; + + TIME_NOW(&now); + + /* + * Expire check. + */ + switch (zone->type) { + case dns_zone_slave: + case dns_zone_stub: + LOCK_ZONE(zone); + if (isc_time_compare(&now, &zone->expiretime) >= 0 && + DNS_ZONE_FLAG(zone, DNS_ZONEFLG_LOADED)) { + zone_expire(zone); + zone->refreshtime = now; + } + UNLOCK_ZONE(zone); + break; + default: + break; + } + + /* + * Up to date check. + */ + switch (zone->type) { + case dns_zone_slave: + case dns_zone_stub: + if (!DNS_ZONE_FLAG(zone, DNS_ZONEFLG_DIALREFRESH) && + isc_time_compare(&now, &zone->refreshtime) >= 0) + dns_zone_refresh(zone); + break; + default: + break; + } + + /* + * Do we need to consolidate the backing store? + */ + switch (zone->type) { + case dns_zone_master: + case dns_zone_slave: + LOCK_ZONE(zone); + if (zone->masterfile != NULL && + isc_time_compare(&now, &zone->dumptime) >= 0 && + DNS_ZONE_FLAG(zone, DNS_ZONEFLG_LOADED) && + DNS_ZONE_FLAG(zone, DNS_ZONEFLG_NEEDDUMP)) { + dumping = was_dumping(zone); + } else + dumping = ISC_TRUE; + UNLOCK_ZONE(zone); + if (!dumping) { + result = zone_dump(zone, ISC_TRUE); /* task locked */ + if (result != ISC_R_SUCCESS) + dns_zone_log(zone, ISC_LOG_WARNING, + "dump failed: %s", + dns_result_totext(result)); + } + break; + default: + break; + } + + /* + * Do we need to send out notify messages? + */ + switch (zone->type) { + case dns_zone_master: + case dns_zone_slave: + if (DNS_ZONE_FLAG(zone, DNS_ZONEFLG_NEEDNOTIFY) && + isc_time_compare(&now, &zone->notifytime) >= 0) + zone_notify(zone, &now); + break; + default: + break; + } + zone_settimer(zone, &now); +} + +void +dns_zone_markdirty(dns_zone_t *zone) { + + LOCK_ZONE(zone); + zone_needdump(zone, DNS_DUMP_DELAY); + UNLOCK_ZONE(zone); +} + +void +dns_zone_expire(dns_zone_t *zone) { + REQUIRE(DNS_ZONE_VALID(zone)); + + LOCK_ZONE(zone); + zone_expire(zone); + UNLOCK_ZONE(zone); +} + +static void +zone_expire(dns_zone_t *zone) { + /* + * 'zone' locked by caller. + */ + + REQUIRE(LOCKED_ZONE(zone)); + + dns_zone_log(zone, ISC_LOG_WARNING, "expired"); + + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_EXPIRED); + zone->refresh = DNS_ZONE_DEFAULTREFRESH; + zone->retry = DNS_ZONE_DEFAULTRETRY; + DNS_ZONE_CLRFLAG(zone, DNS_ZONEFLG_HAVETIMERS); + zone_unload(zone); +} + +void +dns_zone_refresh(dns_zone_t *zone) { + isc_interval_t i; + isc_uint32_t oldflags; + unsigned int j; + isc_result_t result; + + REQUIRE(DNS_ZONE_VALID(zone)); + + if (DNS_ZONE_FLAG(zone, DNS_ZONEFLG_EXITING)) + return; + + /* + * Set DNS_ZONEFLG_REFRESH so that there is only one refresh operation + * in progress at a time. + */ + + LOCK_ZONE(zone); + oldflags = zone->flags; + if (zone->masterscnt == 0) { + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_NOMASTERS); + if ((oldflags & DNS_ZONEFLG_NOMASTERS) == 0) + dns_zone_log(zone, ISC_LOG_ERROR, + "cannot refresh: no masters"); + goto unlock; + } + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_REFRESH); + DNS_ZONE_CLRFLAG(zone, DNS_ZONEFLG_NOEDNS); + DNS_ZONE_CLRFLAG(zone, DNS_ZONEFLG_USEALTXFRSRC); + if ((oldflags & (DNS_ZONEFLG_REFRESH|DNS_ZONEFLG_LOADING)) != 0) + goto unlock; + + /* + * Set the next refresh time as if refresh check has failed. + * Setting this to the retry time will do that. XXXMLG + * If we are successful it will be reset using zone->refresh. + */ + isc_interval_set(&i, isc_random_jitter(zone->retry, zone->retry / 4), + 0); + result = isc_time_nowplusinterval(&zone->refreshtime, &i); + if (result |= ISC_R_SUCCESS) + dns_zone_log(zone, ISC_LOG_WARNING, + "isc_time_nowplusinterval() failed: %s", + dns_result_totext(result)); + + /* + * When lacking user-specified timer values from the SOA, + * do exponential backoff of the retry time up to a + * maximum of six hours. + */ + if (! DNS_ZONE_FLAG(zone, DNS_ZONEFLG_HAVETIMERS)) + zone->retry = ISC_MIN(zone->retry * 2, 6 * 3600); + + zone->curmaster = 0; + for (j = 0; j < zone->masterscnt; j++) + zone->mastersok[j] = ISC_FALSE; + /* initiate soa query */ + queue_soa_query(zone); + unlock: + UNLOCK_ZONE(zone); +} + +isc_result_t +dns_zone_flush(dns_zone_t *zone) { + isc_result_t result = ISC_R_SUCCESS; + isc_boolean_t dumping; + + REQUIRE(DNS_ZONE_VALID(zone)); + + LOCK_ZONE(zone); + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_FLUSH); + if (DNS_ZONE_FLAG(zone, DNS_ZONEFLG_NEEDDUMP) && + zone->masterfile != NULL) { + result = ISC_R_ALREADYRUNNING; + dumping = was_dumping(zone); + } else + dumping = ISC_TRUE; + UNLOCK_ZONE(zone); + if (!dumping) + result = zone_dump(zone, ISC_FALSE); /* Unknown task. */ + return (result); +} + +isc_result_t +dns_zone_dump(dns_zone_t *zone) { + isc_result_t result = ISC_R_ALREADYRUNNING; + isc_boolean_t dumping; + + REQUIRE(DNS_ZONE_VALID(zone)); + + LOCK_ZONE(zone); + dumping = was_dumping(zone); + UNLOCK_ZONE(zone); + if (!dumping) + result = zone_dump(zone, ISC_FALSE); /* Unknown task. */ + return (result); +} + +static void +zone_needdump(dns_zone_t *zone, unsigned int delay) { + isc_time_t dumptime; + isc_time_t now; + + /* + * 'zone' locked by caller + */ + + REQUIRE(DNS_ZONE_VALID(zone)); + REQUIRE(LOCKED_ZONE(zone)); + + /* + * Do we have a place to dump to and are we loaded? + */ + if (zone->masterfile == NULL || + DNS_ZONE_FLAG(zone, DNS_ZONEFLG_LOADED) == 0) + return; + + TIME_NOW(&now); + /* add some noise */ + DNS_ZONE_JITTER_ADD(&now, delay, &dumptime); + + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_NEEDDUMP); + if (isc_time_isepoch(&zone->dumptime) || + isc_time_compare(&zone->dumptime, &dumptime) > 0) + zone->dumptime = dumptime; + if (zone->task != NULL) + zone_settimer(zone, &now); +} + +static void +dump_done(void *arg, isc_result_t result) { + const char me[] = "dump_done"; + dns_zone_t *zone = arg; + dns_db_t *db; + dns_dbversion_t *version; + isc_boolean_t again = ISC_FALSE; + isc_boolean_t compact = ISC_FALSE; + isc_uint32_t serial; + isc_result_t tresult; + + REQUIRE(DNS_ZONE_VALID(zone)); + + ENTER; + + if (result == ISC_R_SUCCESS && zone->journal != NULL && + zone->journalsize != -1) { + + /* + * We don't own these, zone->dctx must stay valid. + */ + db = dns_dumpctx_db(zone->dctx); + version = dns_dumpctx_version(zone->dctx); + + tresult = dns_db_getsoaserial(db, version, &serial); + /* + * Note: we are task locked here so we can test + * zone->xfr safely. + */ + if (tresult == ISC_R_SUCCESS && zone->xfr == NULL) { + tresult = dns_journal_compact(zone->mctx, + zone->journal, + serial, + zone->journalsize); + switch (tresult) { + case ISC_R_SUCCESS: + case ISC_R_NOSPACE: + case ISC_R_NOTFOUND: + dns_zone_log(zone, ISC_LOG_DEBUG(3), + "dns_journal_compact: %s", + dns_result_totext(tresult)); + break; + default: + dns_zone_log(zone, ISC_LOG_ERROR, + "dns_journal_compact failed: %s", + dns_result_totext(tresult)); + break; + } + } else if (tresult == ISC_R_SUCCESS) { + compact = ISC_TRUE; + zone->compact_serial = serial; + } + } + + LOCK_ZONE(zone); + DNS_ZONE_CLRFLAG(zone, DNS_ZONEFLG_DUMPING); + if (compact) + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_NEEDCOMPACT); + if (result != ISC_R_SUCCESS && result != ISC_R_CANCELED) { + /* + * Try again in a short while. + */ + zone_needdump(zone, DNS_DUMP_DELAY); + } else if (result == ISC_R_SUCCESS && + DNS_ZONE_FLAG(zone, DNS_ZONEFLG_FLUSH) && + DNS_ZONE_FLAG(zone, DNS_ZONEFLG_NEEDDUMP) && + DNS_ZONE_FLAG(zone, DNS_ZONEFLG_LOADED)) { + DNS_ZONE_CLRFLAG(zone, DNS_ZONEFLG_NEEDDUMP); + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_DUMPING); + isc_time_settoepoch(&zone->dumptime); + again = ISC_TRUE; + } else if (result == ISC_R_SUCCESS) + DNS_ZONE_CLRFLAG(zone, DNS_ZONEFLG_FLUSH); + + if (zone->dctx != NULL) + dns_dumpctx_detach(&zone->dctx); + zonemgr_putio(&zone->writeio); + UNLOCK_ZONE(zone); + if (again) + (void)zone_dump(zone, ISC_FALSE); + dns_zone_idetach(&zone); +} + +static isc_result_t +zone_dump(dns_zone_t *zone, isc_boolean_t compact) { + const char me[] = "zone_dump"; + isc_result_t result; + dns_dbversion_t *version = NULL; + isc_boolean_t again; + dns_db_t *db = NULL; + char *masterfile = NULL; + dns_masterformat_t masterformat = dns_masterformat_none; + +/* + * 'compact' MUST only be set if we are task locked. + */ + + REQUIRE(DNS_ZONE_VALID(zone)); + ENTER; + + redo: + ZONEDB_LOCK(&zone->dblock, isc_rwlocktype_read); + if (zone->db != NULL) + dns_db_attach(zone->db, &db); + ZONEDB_UNLOCK(&zone->dblock, isc_rwlocktype_read); + LOCK_ZONE(zone); + if (zone->masterfile != NULL) { + masterfile = isc_mem_strdup(zone->mctx, zone->masterfile); + masterformat = zone->masterformat; + } + UNLOCK_ZONE(zone); + if (db == NULL) { + result = DNS_R_NOTLOADED; + goto fail; + } + if (masterfile == NULL) { + result = DNS_R_NOMASTERFILE; + goto fail; + } + + if (compact) { + dns_zone_t *dummy = NULL; + LOCK_ZONE(zone); + zone_iattach(zone, &dummy); + result = zonemgr_getio(zone->zmgr, ISC_FALSE, zone->task, + zone_gotwritehandle, zone, + &zone->writeio); + if (result != ISC_R_SUCCESS) + zone_idetach(&dummy); + else + result = DNS_R_CONTINUE; + UNLOCK_ZONE(zone); + } else { + dns_db_currentversion(db, &version); + result = dns_master_dump2(zone->mctx, db, version, + &dns_master_style_default, + masterfile, masterformat); + dns_db_closeversion(db, &version, ISC_FALSE); + } + fail: + if (db != NULL) + dns_db_detach(&db); + if (masterfile != NULL) + isc_mem_free(zone->mctx, masterfile); + masterfile = NULL; + + if (result == DNS_R_CONTINUE) + return (ISC_R_SUCCESS); /* XXXMPA */ + + again = ISC_FALSE; + LOCK_ZONE(zone); + DNS_ZONE_CLRFLAG(zone, DNS_ZONEFLG_DUMPING); + if (result != ISC_R_SUCCESS) { + /* + * Try again in a short while. + */ + zone_needdump(zone, DNS_DUMP_DELAY); + } else if (DNS_ZONE_FLAG(zone, DNS_ZONEFLG_FLUSH) && + DNS_ZONE_FLAG(zone, DNS_ZONEFLG_NEEDDUMP) && + DNS_ZONE_FLAG(zone, DNS_ZONEFLG_LOADED)) { + DNS_ZONE_CLRFLAG(zone, DNS_ZONEFLG_NEEDDUMP); + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_DUMPING); + isc_time_settoepoch(&zone->dumptime); + again = ISC_TRUE; + } else + DNS_ZONE_CLRFLAG(zone, DNS_ZONEFLG_FLUSH); + UNLOCK_ZONE(zone); + if (again) + goto redo; + + return (result); +} + +static isc_result_t +dumptostream(dns_zone_t *zone, FILE *fd, const dns_master_style_t *style, + dns_masterformat_t format) +{ + isc_result_t result; + dns_dbversion_t *version = NULL; + dns_db_t *db = NULL; + + REQUIRE(DNS_ZONE_VALID(zone)); + + ZONEDB_LOCK(&zone->dblock, isc_rwlocktype_read); + if (zone->db != NULL) + dns_db_attach(zone->db, &db); + ZONEDB_UNLOCK(&zone->dblock, isc_rwlocktype_read); + if (db == NULL) + return (DNS_R_NOTLOADED); + + dns_db_currentversion(db, &version); + result = dns_master_dumptostream2(zone->mctx, db, version, style, + format, fd); + dns_db_closeversion(db, &version, ISC_FALSE); + dns_db_detach(&db); + return (result); +} + +isc_result_t +dns_zone_dumptostream2(dns_zone_t *zone, FILE *fd, dns_masterformat_t format, + const dns_master_style_t *style) { + return dumptostream(zone, fd, style, format); +} + +isc_result_t +dns_zone_dumptostream(dns_zone_t *zone, FILE *fd) { + return dumptostream(zone, fd, &dns_master_style_default, + dns_masterformat_text); +} + +isc_result_t +dns_zone_fulldumptostream(dns_zone_t *zone, FILE *fd) { + return dumptostream(zone, fd, &dns_master_style_full, + dns_masterformat_text); +} + +void +dns_zone_unload(dns_zone_t *zone) { + REQUIRE(DNS_ZONE_VALID(zone)); + + LOCK_ZONE(zone); + zone_unload(zone); + UNLOCK_ZONE(zone); +} + +static void +notify_cancel(dns_zone_t *zone) { + dns_notify_t *notify; + + /* + * 'zone' locked by caller. + */ + + REQUIRE(LOCKED_ZONE(zone)); + + for (notify = ISC_LIST_HEAD(zone->notifies); + notify != NULL; + notify = ISC_LIST_NEXT(notify, link)) { + if (notify->find != NULL) + dns_adb_cancelfind(notify->find); + if (notify->request != NULL) + dns_request_cancel(notify->request); + } +} + +static void +zone_unload(dns_zone_t *zone) { + + /* + * 'zone' locked by caller. + */ + + REQUIRE(LOCKED_ZONE(zone)); + + ZONEDB_LOCK(&zone->dblock, isc_rwlocktype_write); + zone_detachdb(zone); + ZONEDB_UNLOCK(&zone->dblock, isc_rwlocktype_write); + DNS_ZONE_CLRFLAG(zone, DNS_ZONEFLG_LOADED); + DNS_ZONE_CLRFLAG(zone, DNS_ZONEFLG_NEEDDUMP); +} + +void +dns_zone_setminrefreshtime(dns_zone_t *zone, isc_uint32_t val) { + REQUIRE(DNS_ZONE_VALID(zone)); + REQUIRE(val > 0); + + zone->minrefresh = val; +} + +void +dns_zone_setmaxrefreshtime(dns_zone_t *zone, isc_uint32_t val) { + REQUIRE(DNS_ZONE_VALID(zone)); + REQUIRE(val > 0); + + zone->maxrefresh = val; +} + +void +dns_zone_setminretrytime(dns_zone_t *zone, isc_uint32_t val) { + REQUIRE(DNS_ZONE_VALID(zone)); + REQUIRE(val > 0); + + zone->minretry = val; +} + +void +dns_zone_setmaxretrytime(dns_zone_t *zone, isc_uint32_t val) { + REQUIRE(DNS_ZONE_VALID(zone)); + REQUIRE(val > 0); + + zone->maxretry = val; +} + +static isc_boolean_t +notify_isqueued(dns_zone_t *zone, dns_name_t *name, isc_sockaddr_t *addr) { + dns_notify_t *notify; + + for (notify = ISC_LIST_HEAD(zone->notifies); + notify != NULL; + notify = ISC_LIST_NEXT(notify, link)) { + if (notify->request != NULL) + continue; + if (name != NULL && dns_name_dynamic(¬ify->ns) && + dns_name_equal(name, ¬ify->ns)) + return (ISC_TRUE); + if (addr != NULL && isc_sockaddr_equal(addr, ¬ify->dst)) + return (ISC_TRUE); + } + return (ISC_FALSE); +} + +static isc_boolean_t +notify_isself(dns_zone_t *zone, isc_sockaddr_t *dst) { + dns_tsigkey_t *key = NULL; + isc_sockaddr_t src; + isc_sockaddr_t any; + isc_boolean_t isself; + isc_netaddr_t dstaddr; + + if (zone->view == NULL || zone->isself == NULL) + return (ISC_FALSE); + + switch (isc_sockaddr_pf(dst)) { + case PF_INET: + src = zone->notifysrc4; + isc_sockaddr_any(&any); + break; + case PF_INET6: + src = zone->notifysrc6; + isc_sockaddr_any6(&any); + break; + default: + return (ISC_FALSE); + } + + /* + * When sending from any the kernel will assign a source address + * that matches the destination address. + */ + if (isc_sockaddr_eqaddr(&any, &src)) + src = *dst; + + isc_netaddr_fromsockaddr(&dstaddr, dst); + (void)dns_view_getpeertsig(zone->view, &dstaddr, &key); + isself = (zone->isself)(zone->view, key, &src, dst, zone->rdclass, + zone->isselfarg); + if (key != NULL) + dns_tsigkey_detach(&key); + return (isself); +} + +static void +notify_destroy(dns_notify_t *notify, isc_boolean_t locked) { + isc_mem_t *mctx; + + /* + * Caller holds zone lock. + */ + REQUIRE(DNS_NOTIFY_VALID(notify)); + + if (notify->zone != NULL) { + if (!locked) + LOCK_ZONE(notify->zone); + REQUIRE(LOCKED_ZONE(notify->zone)); + if (ISC_LINK_LINKED(notify, link)) + ISC_LIST_UNLINK(notify->zone->notifies, notify, link); + if (!locked) + UNLOCK_ZONE(notify->zone); + if (locked) + zone_idetach(¬ify->zone); + else + dns_zone_idetach(¬ify->zone); + } + if (notify->find != NULL) + dns_adb_destroyfind(¬ify->find); + if (notify->request != NULL) + dns_request_destroy(¬ify->request); + if (dns_name_dynamic(¬ify->ns)) + dns_name_free(¬ify->ns, notify->mctx); + mctx = notify->mctx; + isc_mem_put(notify->mctx, notify, sizeof(*notify)); + isc_mem_detach(&mctx); +} + +static isc_result_t +notify_create(isc_mem_t *mctx, unsigned int flags, dns_notify_t **notifyp) { + dns_notify_t *notify; + + REQUIRE(notifyp != NULL && *notifyp == NULL); + + notify = isc_mem_get(mctx, sizeof(*notify)); + if (notify == NULL) + return (ISC_R_NOMEMORY); + + notify->mctx = NULL; + isc_mem_attach(mctx, ¬ify->mctx); + notify->flags = flags; + notify->zone = NULL; + notify->find = NULL; + notify->request = NULL; + isc_sockaddr_any(¬ify->dst); + dns_name_init(¬ify->ns, NULL); + ISC_LINK_INIT(notify, link); + notify->magic = NOTIFY_MAGIC; + *notifyp = notify; + return (ISC_R_SUCCESS); +} + +/* + * XXXAG should check for DNS_ZONEFLG_EXITING + */ +static void +process_adb_event(isc_task_t *task, isc_event_t *ev) { + dns_notify_t *notify; + isc_eventtype_t result; + + UNUSED(task); + + notify = ev->ev_arg; + REQUIRE(DNS_NOTIFY_VALID(notify)); + INSIST(task == notify->zone->task); + result = ev->ev_type; + isc_event_free(&ev); + if (result == DNS_EVENT_ADBMOREADDRESSES) { + dns_adb_destroyfind(¬ify->find); + notify_find_address(notify); + return; + } + if (result == DNS_EVENT_ADBNOMOREADDRESSES) { + LOCK_ZONE(notify->zone); + notify_send(notify); + UNLOCK_ZONE(notify->zone); + } + notify_destroy(notify, ISC_FALSE); +} + +static void +notify_find_address(dns_notify_t *notify) { + isc_result_t result; + unsigned int options; + + REQUIRE(DNS_NOTIFY_VALID(notify)); + options = DNS_ADBFIND_WANTEVENT | DNS_ADBFIND_INET | + DNS_ADBFIND_INET6 | DNS_ADBFIND_RETURNLAME; + + if (notify->zone->view->adb == NULL) + goto destroy; + + result = dns_adb_createfind(notify->zone->view->adb, + notify->zone->task, + process_adb_event, notify, + ¬ify->ns, dns_rootname, 0, + options, 0, NULL, + notify->zone->view->dstport, + ¬ify->find); + + /* Something failed? */ + if (result != ISC_R_SUCCESS) + goto destroy; + + /* More addresses pending? */ + if ((notify->find->options & DNS_ADBFIND_WANTEVENT) != 0) + return; + + /* We have as many addresses as we can get. */ + LOCK_ZONE(notify->zone); + notify_send(notify); + UNLOCK_ZONE(notify->zone); + + destroy: + notify_destroy(notify, ISC_FALSE); +} + + +static isc_result_t +notify_send_queue(dns_notify_t *notify) { + isc_event_t *e; + isc_result_t result; + + e = isc_event_allocate(notify->mctx, NULL, + DNS_EVENT_NOTIFYSENDTOADDR, + notify_send_toaddr, + notify, sizeof(isc_event_t)); + if (e == NULL) + return (ISC_R_NOMEMORY); + e->ev_arg = notify; + e->ev_sender = NULL; + result = isc_ratelimiter_enqueue(notify->zone->zmgr->rl, + notify->zone->task, &e); + if (result != ISC_R_SUCCESS) + isc_event_free(&e); + return (result); +} + +static void +notify_send_toaddr(isc_task_t *task, isc_event_t *event) { + dns_notify_t *notify; + isc_result_t result; + dns_message_t *message = NULL; + isc_netaddr_t dstip; + dns_tsigkey_t *key = NULL; + char addrbuf[ISC_SOCKADDR_FORMATSIZE]; + isc_sockaddr_t src; + int timeout; + isc_boolean_t have_notifysource = ISC_FALSE; + + notify = event->ev_arg; + REQUIRE(DNS_NOTIFY_VALID(notify)); + + UNUSED(task); + + LOCK_ZONE(notify->zone); + + if (DNS_ZONE_FLAG(notify->zone, DNS_ZONEFLG_LOADED) == 0) { + result = ISC_R_CANCELED; + goto cleanup; + } + + if ((event->ev_attributes & ISC_EVENTATTR_CANCELED) != 0 || + DNS_ZONE_FLAG(notify->zone, DNS_ZONEFLG_EXITING) || + notify->zone->view->requestmgr == NULL || + notify->zone->db == NULL) { + result = ISC_R_CANCELED; + goto cleanup; + } + + /* + * The raw IPv4 address should also exist. Don't send to the + * mapped form. + */ + if (isc_sockaddr_pf(¬ify->dst) == PF_INET6 && + IN6_IS_ADDR_V4MAPPED(¬ify->dst.type.sin6.sin6_addr)) { + isc_sockaddr_format(¬ify->dst, addrbuf, sizeof(addrbuf)); + notify_log(notify->zone, ISC_LOG_DEBUG(3), + "notify: ignoring IPv6 mapped IPV4 address: %s", + addrbuf); + result = ISC_R_CANCELED; + goto cleanup; + } + + result = notify_createmessage(notify->zone, notify->flags, &message); + if (result != ISC_R_SUCCESS) + goto cleanup; + + isc_netaddr_fromsockaddr(&dstip, ¬ify->dst); + (void)dns_view_getpeertsig(notify->zone->view, &dstip, &key); + + isc_sockaddr_format(¬ify->dst, addrbuf, sizeof(addrbuf)); + notify_log(notify->zone, ISC_LOG_DEBUG(3), "sending notify to %s", + addrbuf); + if (notify->zone->view->peers != NULL) { + dns_peer_t *peer = NULL; + result = dns_peerlist_peerbyaddr(notify->zone->view->peers, + &dstip, &peer); + if (result == ISC_R_SUCCESS) { + result = dns_peer_getnotifysource(peer, &src); + if (result == ISC_R_SUCCESS) + have_notifysource = ISC_TRUE; + } + } + switch (isc_sockaddr_pf(¬ify->dst)) { + case PF_INET: + if (!have_notifysource) + src = notify->zone->notifysrc4; + break; + case PF_INET6: + if (!have_notifysource) + src = notify->zone->notifysrc6; + break; + default: + result = ISC_R_NOTIMPLEMENTED; + goto cleanup_key; + } + timeout = 15; + if (DNS_ZONE_FLAG(notify->zone, DNS_ZONEFLG_DIALNOTIFY)) + timeout = 30; + result = dns_request_createvia2(notify->zone->view->requestmgr, + message, &src, ¬ify->dst, 0, key, + timeout * 3, timeout, + notify->zone->task, notify_done, + notify, ¬ify->request); + cleanup_key: + if (key != NULL) + dns_tsigkey_detach(&key); + dns_message_destroy(&message); + cleanup: + UNLOCK_ZONE(notify->zone); + if (result != ISC_R_SUCCESS) + notify_destroy(notify, ISC_FALSE); + isc_event_free(&event); +} + +static void +notify_send(dns_notify_t *notify) { + dns_adbaddrinfo_t *ai; + isc_sockaddr_t dst; + isc_result_t result; + dns_notify_t *new = NULL; + + /* + * Zone lock held by caller. + */ + REQUIRE(DNS_NOTIFY_VALID(notify)); + REQUIRE(LOCKED_ZONE(notify->zone)); + + for (ai = ISC_LIST_HEAD(notify->find->list); + ai != NULL; + ai = ISC_LIST_NEXT(ai, publink)) { + dst = ai->sockaddr; + if (notify_isqueued(notify->zone, NULL, &dst)) + continue; + if (notify_isself(notify->zone, &dst)) + continue; + new = NULL; + result = notify_create(notify->mctx, + (notify->flags & DNS_NOTIFY_NOSOA), + &new); + if (result != ISC_R_SUCCESS) + goto cleanup; + zone_iattach(notify->zone, &new->zone); + ISC_LIST_APPEND(new->zone->notifies, new, link); + new->dst = dst; + result = notify_send_queue(new); + if (result != ISC_R_SUCCESS) + goto cleanup; + new = NULL; + } + + cleanup: + if (new != NULL) + notify_destroy(new, ISC_TRUE); +} + +void +dns_zone_notify(dns_zone_t *zone) { + isc_time_t now; + + REQUIRE(DNS_ZONE_VALID(zone)); + + LOCK_ZONE(zone); + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_NEEDNOTIFY); + + TIME_NOW(&now); + zone_settimer(zone, &now); + UNLOCK_ZONE(zone); +} + +static void +zone_notify(dns_zone_t *zone, isc_time_t *now) { + dns_dbnode_t *node = NULL; + dns_db_t *zonedb = NULL; + dns_dbversion_t *version = NULL; + dns_name_t *origin = NULL; + dns_name_t master; + dns_rdata_ns_t ns; + dns_rdata_soa_t soa; + isc_uint32_t serial; + dns_rdata_t rdata = DNS_RDATA_INIT; + dns_rdataset_t nsrdset; + dns_rdataset_t soardset; + isc_result_t result; + dns_notify_t *notify = NULL; + unsigned int i; + isc_sockaddr_t dst; + isc_boolean_t isqueued; + dns_notifytype_t notifytype; + unsigned int flags = 0; + isc_boolean_t loggednotify = ISC_FALSE; + + REQUIRE(DNS_ZONE_VALID(zone)); + + LOCK_ZONE(zone); + DNS_ZONE_CLRFLAG(zone, DNS_ZONEFLG_NEEDNOTIFY); + notifytype = zone->notifytype; + DNS_ZONE_TIME_ADD(now, zone->notifydelay, &zone->notifytime); + UNLOCK_ZONE(zone); + + if (! DNS_ZONE_FLAG(zone, DNS_ZONEFLG_LOADED)) + return; + + if (notifytype == dns_notifytype_no) + return; + + if (notifytype == dns_notifytype_masteronly && + zone->type != dns_zone_master) + return; + + origin = &zone->origin; + + /* + * If the zone is dialup we are done as we don't want to send + * the current soa so as to force a refresh query. + */ + if (DNS_ZONE_FLAG(zone, DNS_ZONEFLG_DIALNOTIFY)) + flags |= DNS_NOTIFY_NOSOA; + + /* + * Get SOA RRset. + */ + ZONEDB_LOCK(&zone->dblock, isc_rwlocktype_read); + if (zone->db != NULL) + dns_db_attach(zone->db, &zonedb); + ZONEDB_UNLOCK(&zone->dblock, isc_rwlocktype_read); + if (zonedb == NULL) + return; + dns_db_currentversion(zonedb, &version); + result = dns_db_findnode(zonedb, origin, ISC_FALSE, &node); + if (result != ISC_R_SUCCESS) + goto cleanup1; + + dns_rdataset_init(&soardset); + result = dns_db_findrdataset(zonedb, node, version, dns_rdatatype_soa, + dns_rdatatype_none, 0, &soardset, NULL); + if (result != ISC_R_SUCCESS) + goto cleanup2; + + /* + * Find serial and master server's name. + */ + dns_name_init(&master, NULL); + result = dns_rdataset_first(&soardset); + if (result != ISC_R_SUCCESS) + goto cleanup3; + dns_rdataset_current(&soardset, &rdata); + result = dns_rdata_tostruct(&rdata, &soa, NULL); + RUNTIME_CHECK(result == ISC_R_SUCCESS); + dns_rdata_reset(&rdata); + result = dns_name_dup(&soa.origin, zone->mctx, &master); + serial = soa.serial; + dns_rdataset_disassociate(&soardset); + if (result != ISC_R_SUCCESS) + goto cleanup3; + + /* + * Enqueue notify requests for 'also-notify' servers. + */ + LOCK_ZONE(zone); + for (i = 0; i < zone->notifycnt; i++) { + dst = zone->notify[i]; + if (notify_isqueued(zone, NULL, &dst)) + continue; + result = notify_create(zone->mctx, flags, ¬ify); + if (result != ISC_R_SUCCESS) + continue; + zone_iattach(zone, ¬ify->zone); + notify->dst = dst; + ISC_LIST_APPEND(zone->notifies, notify, link); + result = notify_send_queue(notify); + if (result != ISC_R_SUCCESS) + notify_destroy(notify, ISC_TRUE); + if (!loggednotify) { + notify_log(zone, ISC_LOG_INFO, + "sending notifies (serial %u)", + serial); + loggednotify = ISC_TRUE; + } + notify = NULL; + } + UNLOCK_ZONE(zone); + + if (notifytype == dns_notifytype_explicit) + goto cleanup3; + + /* + * Process NS RRset to generate notifies. + */ + + dns_rdataset_init(&nsrdset); + result = dns_db_findrdataset(zonedb, node, version, dns_rdatatype_ns, + dns_rdatatype_none, 0, &nsrdset, NULL); + if (result != ISC_R_SUCCESS) + goto cleanup3; + + result = dns_rdataset_first(&nsrdset); + while (result == ISC_R_SUCCESS) { + dns_rdataset_current(&nsrdset, &rdata); + result = dns_rdata_tostruct(&rdata, &ns, NULL); + RUNTIME_CHECK(result == ISC_R_SUCCESS); + dns_rdata_reset(&rdata); + /* + * don't notify the master server. + */ + if (dns_name_compare(&master, &ns.name) == 0) { + result = dns_rdataset_next(&nsrdset); + continue; + } + + if (!loggednotify) { + notify_log(zone, ISC_LOG_INFO, + "sending notifies (serial %u)", + serial); + loggednotify = ISC_TRUE; + } + + LOCK_ZONE(zone); + isqueued = notify_isqueued(zone, &ns.name, NULL); + UNLOCK_ZONE(zone); + if (isqueued) { + result = dns_rdataset_next(&nsrdset); + continue; + } + result = notify_create(zone->mctx, flags, ¬ify); + if (result != ISC_R_SUCCESS) + continue; + dns_zone_iattach(zone, ¬ify->zone); + result = dns_name_dup(&ns.name, zone->mctx, ¬ify->ns); + if (result != ISC_R_SUCCESS) { + LOCK_ZONE(zone); + notify_destroy(notify, ISC_TRUE); + UNLOCK_ZONE(zone); + continue; + } + LOCK_ZONE(zone); + ISC_LIST_APPEND(zone->notifies, notify, link); + UNLOCK_ZONE(zone); + notify_find_address(notify); + notify = NULL; + result = dns_rdataset_next(&nsrdset); + } + dns_rdataset_disassociate(&nsrdset); + + cleanup3: + if (dns_name_dynamic(&master)) + dns_name_free(&master, zone->mctx); + cleanup2: + dns_db_detachnode(zonedb, &node); + cleanup1: + dns_db_closeversion(zonedb, &version, ISC_FALSE); + dns_db_detach(&zonedb); +} + +/*** + *** Private + ***/ + +static inline isc_result_t +save_nsrrset(dns_message_t *message, dns_name_t *name, + dns_db_t *db, dns_dbversion_t *version) +{ + dns_rdataset_t *nsrdataset = NULL; + dns_rdataset_t *rdataset = NULL; + dns_dbnode_t *node = NULL; + dns_rdata_ns_t ns; + isc_result_t result; + dns_rdata_t rdata = DNS_RDATA_INIT; + + /* + * Extract NS RRset from message. + */ + result = dns_message_findname(message, DNS_SECTION_ANSWER, name, + dns_rdatatype_ns, dns_rdatatype_none, + NULL, &nsrdataset); + if (result != ISC_R_SUCCESS) + goto fail; + + /* + * Add NS rdataset. + */ + result = dns_db_findnode(db, name, ISC_TRUE, &node); + if (result != ISC_R_SUCCESS) + goto fail; + result = dns_db_addrdataset(db, node, version, 0, + nsrdataset, 0, NULL); + dns_db_detachnode(db, &node); + if (result != ISC_R_SUCCESS) + goto fail; + /* + * Add glue rdatasets. + */ + for (result = dns_rdataset_first(nsrdataset); + result == ISC_R_SUCCESS; + result = dns_rdataset_next(nsrdataset)) { + dns_rdataset_current(nsrdataset, &rdata); + result = dns_rdata_tostruct(&rdata, &ns, NULL); + RUNTIME_CHECK(result == ISC_R_SUCCESS); + dns_rdata_reset(&rdata); + if (!dns_name_issubdomain(&ns.name, name)) + continue; + rdataset = NULL; + result = dns_message_findname(message, DNS_SECTION_ADDITIONAL, + &ns.name, dns_rdatatype_aaaa, + dns_rdatatype_none, NULL, + &rdataset); + if (result == ISC_R_SUCCESS) { + result = dns_db_findnode(db, &ns.name, + ISC_TRUE, &node); + if (result != ISC_R_SUCCESS) + goto fail; + result = dns_db_addrdataset(db, node, version, 0, + rdataset, 0, NULL); + dns_db_detachnode(db, &node); + if (result != ISC_R_SUCCESS) + goto fail; + } + rdataset = NULL; + result = dns_message_findname(message, DNS_SECTION_ADDITIONAL, + &ns.name, dns_rdatatype_a, + dns_rdatatype_none, NULL, + &rdataset); + if (result == ISC_R_SUCCESS) { + result = dns_db_findnode(db, &ns.name, + ISC_TRUE, &node); + if (result != ISC_R_SUCCESS) + goto fail; + result = dns_db_addrdataset(db, node, version, 0, + rdataset, 0, NULL); + dns_db_detachnode(db, &node); + if (result != ISC_R_SUCCESS) + goto fail; + } + } + if (result != ISC_R_NOMORE) + goto fail; + + return (ISC_R_SUCCESS); + +fail: + return (result); +} + +static void +stub_callback(isc_task_t *task, isc_event_t *event) { + const char me[] = "stub_callback"; + dns_requestevent_t *revent = (dns_requestevent_t *)event; + dns_stub_t *stub = NULL; + dns_message_t *msg = NULL; + dns_zone_t *zone = NULL; + char master[ISC_SOCKADDR_FORMATSIZE]; + char source[ISC_SOCKADDR_FORMATSIZE]; + isc_uint32_t nscnt, cnamecnt; + isc_result_t result; + isc_time_t now; + isc_boolean_t exiting = ISC_FALSE; + isc_interval_t i; + unsigned int j; + + stub = revent->ev_arg; + INSIST(DNS_STUB_VALID(stub)); + + UNUSED(task); + + zone = stub->zone; + + ENTER; + + TIME_NOW(&now); + + if (DNS_ZONE_FLAG(zone, DNS_ZONEFLG_EXITING)) { + zone_debuglog(zone, me, 1, "exiting"); + exiting = ISC_TRUE; + goto next_master; + } + + isc_sockaddr_format(&zone->masteraddr, master, sizeof(master)); + isc_sockaddr_format(&zone->sourceaddr, source, sizeof(source)); + + if (revent->result != ISC_R_SUCCESS) { + if (revent->result == ISC_R_TIMEDOUT && + !DNS_ZONE_FLAG(zone, DNS_ZONEFLG_NOEDNS)) { + LOCK_ZONE(zone); + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_NOEDNS); + UNLOCK_ZONE(zone); + dns_zone_log(zone, ISC_LOG_DEBUG(1), + "refreshing stub: timeout retrying " + " without EDNS master %s (source %s)", + master, source); + goto same_master; + } + dns_zone_log(zone, ISC_LOG_INFO, + "could not refresh stub from master %s" + " (source %s): %s", master, source, + dns_result_totext(revent->result)); + goto next_master; + } + + result = dns_message_create(zone->mctx, DNS_MESSAGE_INTENTPARSE, &msg); + if (result != ISC_R_SUCCESS) + goto next_master; + + result = dns_request_getresponse(revent->request, msg, 0); + if (result != ISC_R_SUCCESS) + goto next_master; + + /* + * Unexpected rcode. + */ + if (msg->rcode != dns_rcode_noerror) { + char rcode[128]; + isc_buffer_t rb; + + isc_buffer_init(&rb, rcode, sizeof(rcode)); + (void)dns_rcode_totext(msg->rcode, &rb); + + if (!DNS_ZONE_FLAG(zone, DNS_ZONEFLG_NOEDNS) && + (msg->rcode == dns_rcode_servfail || + msg->rcode == dns_rcode_notimp || + msg->rcode == dns_rcode_formerr)) { + dns_zone_log(zone, ISC_LOG_DEBUG(1), + "refreshing stub: rcode (%.*s) retrying " + "without EDNS master %s (source %s)", + (int)rb.used, rcode, master, source); + LOCK_ZONE(zone); + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_NOEDNS); + UNLOCK_ZONE(zone); + goto same_master; + } + + dns_zone_log(zone, ISC_LOG_INFO, + "refreshing stub: " + "unexpected rcode (%.*s) from %s (source %s)", + (int)rb.used, rcode, master, source); + goto next_master; + } + + /* + * We need complete messages. + */ + if ((msg->flags & DNS_MESSAGEFLAG_TC) != 0) { + if (dns_request_usedtcp(revent->request)) { + dns_zone_log(zone, ISC_LOG_INFO, + "refreshing stub: truncated TCP " + "response from master %s (source %s)", + master, source); + goto next_master; + } + LOCK_ZONE(zone); + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_USEVC); + UNLOCK_ZONE(zone); + goto same_master; + } + + /* + * If non-auth log and next master. + */ + if ((msg->flags & DNS_MESSAGEFLAG_AA) == 0) { + dns_zone_log(zone, ISC_LOG_INFO, "refreshing stub: " + "non-authoritative answer from " + "master %s (source %s)", master, source); + goto next_master; + } + + /* + * Sanity checks. + */ + cnamecnt = message_count(msg, DNS_SECTION_ANSWER, dns_rdatatype_cname); + nscnt = message_count(msg, DNS_SECTION_ANSWER, dns_rdatatype_ns); + + if (cnamecnt != 0) { + dns_zone_log(zone, ISC_LOG_INFO, + "refreshing stub: unexpected CNAME response " + "from master %s (source %s)", master, source); + goto next_master; + } + + if (nscnt == 0) { + dns_zone_log(zone, ISC_LOG_INFO, + "refreshing stub: no NS records in response " + "from master %s (source %s)", master, source); + goto next_master; + } + + /* + * Save answer. + */ + result = save_nsrrset(msg, &zone->origin, stub->db, stub->version); + if (result != ISC_R_SUCCESS) { + dns_zone_log(zone, ISC_LOG_INFO, + "refreshing stub: unable to save NS records " + "from master %s (source %s)", master, source); + goto next_master; + } + + /* + * Tidy up. + */ + dns_db_closeversion(stub->db, &stub->version, ISC_TRUE); + ZONEDB_LOCK(&zone->dblock, isc_rwlocktype_write); + if (zone->db == NULL) + zone_attachdb(zone, stub->db); + ZONEDB_UNLOCK(&zone->dblock, isc_rwlocktype_write); + dns_db_detach(&stub->db); + + if (zone->masterfile != NULL) { + dns_zone_dump(zone); + TIME_NOW(&zone->loadtime); + } + + dns_message_destroy(&msg); + isc_event_free(&event); + LOCK_ZONE(zone); + dns_request_destroy(&zone->request); + DNS_ZONE_CLRFLAG(zone, DNS_ZONEFLG_REFRESH); + DNS_ZONE_JITTER_ADD(&now, zone->refresh, &zone->refreshtime); + isc_interval_set(&i, zone->expire, 0); + DNS_ZONE_TIME_ADD(&now, zone->expire, &zone->expiretime); + zone_settimer(zone, &now); + UNLOCK_ZONE(zone); + goto free_stub; + + next_master: + if (stub->version != NULL) + dns_db_closeversion(stub->db, &stub->version, ISC_FALSE); + if (stub->db != NULL) + dns_db_detach(&stub->db); + if (msg != NULL) + dns_message_destroy(&msg); + isc_event_free(&event); + LOCK_ZONE(zone); + dns_request_destroy(&zone->request); + /* + * Skip to next failed / untried master. + */ + do { + zone->curmaster++; + } while (zone->curmaster < zone->masterscnt && + zone->mastersok[zone->curmaster]); + DNS_ZONE_CLRFLAG(zone, DNS_ZONEFLG_NOEDNS); + if (exiting || zone->curmaster >= zone->masterscnt) { + isc_boolean_t done = ISC_TRUE; + if (!exiting && + DNS_ZONE_OPTION(zone, DNS_ZONEOPT_USEALTXFRSRC) && + !DNS_ZONE_FLAG(zone, DNS_ZONEFLG_USEALTXFRSRC)) { + /* + * Did we get a good answer from all the masters? + */ + for (j = 0; j < zone->masterscnt; j++) + if (zone->mastersok[j] == ISC_FALSE) { + done = ISC_FALSE; + break; + } + } else + done = ISC_TRUE; + if (!done) { + zone->curmaster = 0; + /* + * Find the next failed master. + */ + while (zone->curmaster < zone->masterscnt && + zone->mastersok[zone->curmaster]) + zone->curmaster++; + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_USEALTXFRSRC); + } else { + DNS_ZONE_CLRFLAG(zone, DNS_ZONEFLG_REFRESH); + + zone_settimer(zone, &now); + UNLOCK_ZONE(zone); + goto free_stub; + } + } + queue_soa_query(zone); + UNLOCK_ZONE(zone); + goto free_stub; + + same_master: + if (msg != NULL) + dns_message_destroy(&msg); + isc_event_free(&event); + LOCK_ZONE(zone); + dns_request_destroy(&zone->request); + UNLOCK_ZONE(zone); + ns_query(zone, NULL, stub); + goto done; + + free_stub: + stub->magic = 0; + dns_zone_idetach(&stub->zone); + INSIST(stub->db == NULL); + INSIST(stub->version == NULL); + isc_mem_put(stub->mctx, stub, sizeof(*stub)); + + done: + INSIST(event == NULL); + return; +} + +/* + * An SOA query has finished (successfully or not). + */ +static void +refresh_callback(isc_task_t *task, isc_event_t *event) { + const char me[] = "refresh_callback"; + dns_requestevent_t *revent = (dns_requestevent_t *)event; + dns_zone_t *zone; + dns_message_t *msg = NULL; + isc_uint32_t soacnt, cnamecnt, soacount, nscount; + isc_time_t now; + char master[ISC_SOCKADDR_FORMATSIZE]; + char source[ISC_SOCKADDR_FORMATSIZE]; + dns_rdataset_t *rdataset = NULL; + dns_rdata_t rdata = DNS_RDATA_INIT; + dns_rdata_soa_t soa; + isc_result_t result; + isc_uint32_t serial; + unsigned int j; + + zone = revent->ev_arg; + INSIST(DNS_ZONE_VALID(zone)); + + UNUSED(task); + + ENTER; + + /* + * if timeout log and next master; + */ + + isc_sockaddr_format(&zone->masteraddr, master, sizeof(master)); + isc_sockaddr_format(&zone->sourceaddr, source, sizeof(source)); + + TIME_NOW(&now); + + if (revent->result != ISC_R_SUCCESS) { + if (revent->result == ISC_R_TIMEDOUT && + !DNS_ZONE_FLAG(zone, DNS_ZONEFLG_NOEDNS)) { + LOCK_ZONE(zone); + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_NOEDNS); + UNLOCK_ZONE(zone); + dns_zone_log(zone, ISC_LOG_DEBUG(1), + "refresh: timeout retrying without EDNS " + "master %s (source %s)", master, source); + goto same_master; + } + if (revent->result == ISC_R_TIMEDOUT && + !dns_request_usedtcp(revent->request)) { + dns_zone_log(zone, ISC_LOG_INFO, + "refresh: retry limit for " + "master %s exceeded (source %s)", + master, source); + /* Try with slave with TCP. */ + if (zone->type == dns_zone_slave) { + LOCK_ZONE(zone); + DNS_ZONE_SETFLAG(zone, + DNS_ZONEFLG_SOABEFOREAXFR); + UNLOCK_ZONE(zone); + goto tcp_transfer; + } + } else + dns_zone_log(zone, ISC_LOG_INFO, + "refresh: failure trying master " + "%s (source %s): %s", master, source, + dns_result_totext(revent->result)); + goto next_master; + } + + result = dns_message_create(zone->mctx, DNS_MESSAGE_INTENTPARSE, &msg); + if (result != ISC_R_SUCCESS) + goto next_master; + result = dns_request_getresponse(revent->request, msg, 0); + if (result != ISC_R_SUCCESS) { + dns_zone_log(zone, ISC_LOG_INFO, + "refresh: failure trying master " + "%s (source %s): %s", master, source, + dns_result_totext(result)); + goto next_master; + } + + /* + * Unexpected rcode. + */ + if (msg->rcode != dns_rcode_noerror) { + char rcode[128]; + isc_buffer_t rb; + + isc_buffer_init(&rb, rcode, sizeof(rcode)); + (void)dns_rcode_totext(msg->rcode, &rb); + + if (!DNS_ZONE_FLAG(zone, DNS_ZONEFLG_NOEDNS) && + (msg->rcode == dns_rcode_servfail || + msg->rcode == dns_rcode_notimp || + msg->rcode == dns_rcode_formerr)) { + dns_zone_log(zone, ISC_LOG_DEBUG(1), + "refresh: rcode (%.*s) retrying without " + "EDNS master %s (source %s)", + (int)rb.used, rcode, master, source); + LOCK_ZONE(zone); + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_NOEDNS); + UNLOCK_ZONE(zone); + goto same_master; + } + dns_zone_log(zone, ISC_LOG_INFO, + "refresh: unexpected rcode (%.*s) from " + "master %s (source %s)", (int)rb.used, rcode, + master, source); + /* + * Perhaps AXFR/IXFR is allowed even if SOA queries arn't. + */ + if (msg->rcode == dns_rcode_refused && + zone->type == dns_zone_slave) + goto tcp_transfer; + goto next_master; + } + + /* + * If truncated punt to zone transfer which will query again. + */ + if ((msg->flags & DNS_MESSAGEFLAG_TC) != 0) { + if (zone->type == dns_zone_slave) { + dns_zone_log(zone, ISC_LOG_INFO, + "refresh: truncated UDP answer, " + "initiating TCP zone xfer " + "for master %s (source %s)", + master, source); + LOCK_ZONE(zone); + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_SOABEFOREAXFR); + UNLOCK_ZONE(zone); + goto tcp_transfer; + } else { + INSIST(zone->type == dns_zone_stub); + if (dns_request_usedtcp(revent->request)) { + dns_zone_log(zone, ISC_LOG_INFO, + "refresh: truncated TCP response " + "from master %s (source %s)", + master, source); + goto next_master; + } + LOCK_ZONE(zone); + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_USEVC); + UNLOCK_ZONE(zone); + goto same_master; + } + } + + /* + * if non-auth log and next master; + */ + if ((msg->flags & DNS_MESSAGEFLAG_AA) == 0) { + dns_zone_log(zone, ISC_LOG_INFO, + "refresh: non-authoritative answer from " + "master %s (source %s)", master, source); + goto next_master; + } + + cnamecnt = message_count(msg, DNS_SECTION_ANSWER, dns_rdatatype_cname); + soacnt = message_count(msg, DNS_SECTION_ANSWER, dns_rdatatype_soa); + nscount = message_count(msg, DNS_SECTION_AUTHORITY, dns_rdatatype_ns); + soacount = message_count(msg, DNS_SECTION_AUTHORITY, + dns_rdatatype_soa); + + /* + * There should not be a CNAME record at top of zone. + */ + if (cnamecnt != 0) { + dns_zone_log(zone, ISC_LOG_INFO, + "refresh: CNAME at top of zone " + "in master %s (source %s)", master, source); + goto next_master; + } + + /* + * if referral log and next master; + */ + if (soacnt == 0 && soacount == 0 && nscount != 0) { + dns_zone_log(zone, ISC_LOG_INFO, + "refresh: referral response " + "from master %s (source %s)", master, source); + goto next_master; + } + + /* + * if nodata log and next master; + */ + if (soacnt == 0 && (nscount == 0 || soacount != 0)) { + dns_zone_log(zone, ISC_LOG_INFO, + "refresh: NODATA response " + "from master %s (source %s)", master, source); + goto next_master; + } + + /* + * Only one soa at top of zone. + */ + if (soacnt != 1) { + dns_zone_log(zone, ISC_LOG_INFO, + "refresh: answer SOA count (%d) != 1 " + "from master %s (source %s)", + soacnt, master, source); + goto next_master; + } + /* + * Extract serial + */ + rdataset = NULL; + result = dns_message_findname(msg, DNS_SECTION_ANSWER, &zone->origin, + dns_rdatatype_soa, dns_rdatatype_none, + NULL, &rdataset); + if (result != ISC_R_SUCCESS) { + dns_zone_log(zone, ISC_LOG_INFO, + "refresh: unable to get SOA record " + "from master %s (source %s)", master, source); + goto next_master; + } + + result = dns_rdataset_first(rdataset); + if (result != ISC_R_SUCCESS) { + dns_zone_log(zone, ISC_LOG_INFO, + "refresh: dns_rdataset_first() failed"); + goto next_master; + } + + dns_rdataset_current(rdataset, &rdata); + result = dns_rdata_tostruct(&rdata, &soa, NULL); + RUNTIME_CHECK(result == ISC_R_SUCCESS); + + serial = soa.serial; + + zone_debuglog(zone, me, 1, "serial: new %u, old %u", + serial, zone->serial); + if (!DNS_ZONE_FLAG(zone, DNS_ZONEFLG_LOADED) || + DNS_ZONE_FLAG(zone, DNS_ZONEFLG_FORCEXFER) || + isc_serial_gt(serial, zone->serial)) { + tcp_transfer: + isc_event_free(&event); + LOCK_ZONE(zone); + dns_request_destroy(&zone->request); + UNLOCK_ZONE(zone); + if (zone->type == dns_zone_slave) { + queue_xfrin(zone); + } else { + INSIST(zone->type == dns_zone_stub); + ns_query(zone, rdataset, NULL); + } + if (msg != NULL) + dns_message_destroy(&msg); + } else if (isc_serial_eq(soa.serial, zone->serial)) { + if (zone->masterfile != NULL) { + result = ISC_R_FAILURE; + if (zone->journal != NULL) + result = isc_file_settime(zone->journal, &now); + if (result == ISC_R_SUCCESS && + !DNS_ZONE_FLAG(zone, DNS_ZONEFLG_NEEDDUMP) && + !DNS_ZONE_FLAG(zone, DNS_ZONEFLG_DUMPING)) { + result = isc_file_settime(zone->masterfile, + &now); + } else if (result != ISC_R_SUCCESS) + result = isc_file_settime(zone->masterfile, + &now); + /* Someone removed the file from underneath us! */ + if (result == ISC_R_FILENOTFOUND) { + LOCK_ZONE(zone); + zone_needdump(zone, DNS_DUMP_DELAY); + UNLOCK_ZONE(zone); + } else if (result != ISC_R_SUCCESS) + dns_zone_log(zone, ISC_LOG_ERROR, + "refresh: could not set file " + "modification time of '%s': %s", + zone->masterfile, + dns_result_totext(result)); + } + DNS_ZONE_JITTER_ADD(&now, zone->refresh, &zone->refreshtime); + DNS_ZONE_TIME_ADD(&now, zone->expire, &zone->expiretime); + zone->mastersok[zone->curmaster] = ISC_TRUE; + goto next_master; + } else { + if (!DNS_ZONE_OPTION(zone, DNS_ZONEOPT_MULTIMASTER)) + dns_zone_log(zone, ISC_LOG_INFO, "serial number (%u) " + "received from master %s < ours (%u)", + soa.serial, master, zone->serial); + else + zone_debuglog(zone, me, 1, "ahead"); + zone->mastersok[zone->curmaster] = ISC_TRUE; + goto next_master; + } + if (msg != NULL) + dns_message_destroy(&msg); + goto detach; + + next_master: + if (msg != NULL) + dns_message_destroy(&msg); + isc_event_free(&event); + LOCK_ZONE(zone); + dns_request_destroy(&zone->request); + /* + * Skip to next failed / untried master. + */ + do { + zone->curmaster++; + } while (zone->curmaster < zone->masterscnt && + zone->mastersok[zone->curmaster]); + DNS_ZONE_CLRFLAG(zone, DNS_ZONEFLG_NOEDNS); + if (zone->curmaster >= zone->masterscnt) { + isc_boolean_t done = ISC_TRUE; + if (DNS_ZONE_OPTION(zone, DNS_ZONEOPT_USEALTXFRSRC) && + !DNS_ZONE_FLAG(zone, DNS_ZONEFLG_USEALTXFRSRC)) { + /* + * Did we get a good answer from all the masters? + */ + for (j = 0; j < zone->masterscnt; j++) + if (zone->mastersok[j] == ISC_FALSE) { + done = ISC_FALSE; + break; + } + } else + done = ISC_TRUE; + if (!done) { + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_USEALTXFRSRC); + zone->curmaster = 0; + /* + * Find the next failed master. + */ + while (zone->curmaster < zone->masterscnt && + zone->mastersok[zone->curmaster]) + zone->curmaster++; + goto requeue; + } + DNS_ZONE_CLRFLAG(zone, DNS_ZONEFLG_REFRESH); + if (DNS_ZONE_FLAG(zone, DNS_ZONEFLG_NEEDREFRESH)) { + DNS_ZONE_CLRFLAG(zone, DNS_ZONEFLG_NEEDREFRESH); + zone->refreshtime = now; + } + DNS_ZONE_CLRFLAG(zone, DNS_ZONEFLG_USEALTXFRSRC); + zone_settimer(zone, &now); + UNLOCK_ZONE(zone); + goto detach; + } + + requeue: + queue_soa_query(zone); + UNLOCK_ZONE(zone); + goto detach; + + same_master: + if (msg != NULL) + dns_message_destroy(&msg); + isc_event_free(&event); + LOCK_ZONE(zone); + dns_request_destroy(&zone->request); + queue_soa_query(zone); + UNLOCK_ZONE(zone); + + detach: + dns_zone_idetach(&zone); + return; +} + +static void +queue_soa_query(dns_zone_t *zone) { + const char me[] = "queue_soa_query"; + isc_event_t *e; + dns_zone_t *dummy = NULL; + isc_result_t result; + + ENTER; + /* + * Locked by caller + */ + REQUIRE(LOCKED_ZONE(zone)); + + if (DNS_ZONE_FLAG(zone, DNS_ZONEFLG_EXITING)) { + cancel_refresh(zone); + return; + } + + e = isc_event_allocate(zone->mctx, NULL, DNS_EVENT_ZONE, + soa_query, zone, sizeof(isc_event_t)); + if (e == NULL) { + cancel_refresh(zone); + return; + } + + /* + * Attach so that we won't clean up + * until the event is delivered. + */ + zone_iattach(zone, &dummy); + + e->ev_arg = zone; + e->ev_sender = NULL; + result = isc_ratelimiter_enqueue(zone->zmgr->rl, zone->task, &e); + if (result != ISC_R_SUCCESS) { + zone_idetach(&dummy); + isc_event_free(&e); + cancel_refresh(zone); + } +} + +static inline isc_result_t +create_query(dns_zone_t *zone, dns_rdatatype_t rdtype, + dns_message_t **messagep) +{ + dns_message_t *message = NULL; + dns_name_t *qname = NULL; + dns_rdataset_t *qrdataset = NULL; + isc_result_t result; + + result = dns_message_create(zone->mctx, DNS_MESSAGE_INTENTRENDER, + &message); + if (result != ISC_R_SUCCESS) + goto cleanup; + + message->opcode = dns_opcode_query; + message->rdclass = zone->rdclass; + + result = dns_message_gettempname(message, &qname); + if (result != ISC_R_SUCCESS) + goto cleanup; + + result = dns_message_gettemprdataset(message, &qrdataset); + if (result != ISC_R_SUCCESS) + goto cleanup; + + /* + * Make question. + */ + dns_name_init(qname, NULL); + dns_name_clone(&zone->origin, qname); + dns_rdataset_init(qrdataset); + dns_rdataset_makequestion(qrdataset, zone->rdclass, rdtype); + ISC_LIST_APPEND(qname->list, qrdataset, link); + dns_message_addname(message, qname, DNS_SECTION_QUESTION); + + *messagep = message; + return (ISC_R_SUCCESS); + + cleanup: + if (qname != NULL) + dns_message_puttempname(message, &qname); + if (qrdataset != NULL) + dns_message_puttemprdataset(message, &qrdataset); + if (message != NULL) + dns_message_destroy(&message); + return (result); +} + +static isc_result_t +add_opt(dns_message_t *message, isc_uint16_t udpsize) { + dns_rdataset_t *rdataset = NULL; + dns_rdatalist_t *rdatalist = NULL; + dns_rdata_t *rdata = NULL; + isc_result_t result; + + result = dns_message_gettemprdatalist(message, &rdatalist); + if (result != ISC_R_SUCCESS) + goto cleanup; + result = dns_message_gettemprdata(message, &rdata); + if (result != ISC_R_SUCCESS) + goto cleanup; + result = dns_message_gettemprdataset(message, &rdataset); + if (result != ISC_R_SUCCESS) + goto cleanup; + dns_rdataset_init(rdataset); + + rdatalist->type = dns_rdatatype_opt; + rdatalist->covers = 0; + + /* + * Set Maximum UDP buffer size. + */ + rdatalist->rdclass = udpsize; + + /* + * Set EXTENDED-RCODE, VERSION, DO and Z to 0. + */ + rdatalist->ttl = 0; + + /* + * No EDNS options. + */ + rdata->data = NULL; + rdata->length = 0; + rdata->rdclass = rdatalist->rdclass; + rdata->type = rdatalist->type; + rdata->flags = 0; + + ISC_LIST_INIT(rdatalist->rdata); + ISC_LIST_APPEND(rdatalist->rdata, rdata, link); + RUNTIME_CHECK(dns_rdatalist_tordataset(rdatalist, rdataset) + == ISC_R_SUCCESS); + + return (dns_message_setopt(message, rdataset)); + + cleanup: + if (rdatalist != NULL) + dns_message_puttemprdatalist(message, &rdatalist); + if (rdataset != NULL) + dns_message_puttemprdataset(message, &rdataset); + if (rdata != NULL) + dns_message_puttemprdata(message, &rdata); + + return (result); +} + +static void +soa_query(isc_task_t *task, isc_event_t *event) { + const char me[] = "soa_query"; + isc_result_t result = ISC_R_FAILURE; + dns_message_t *message = NULL; + dns_zone_t *zone = event->ev_arg; + dns_zone_t *dummy = NULL; + isc_netaddr_t masterip; + dns_tsigkey_t *key = NULL; + isc_uint32_t options; + isc_boolean_t cancel = ISC_TRUE; + int timeout; + isc_boolean_t have_xfrsource; + isc_uint16_t udpsize = SEND_BUFFER_SIZE; + + REQUIRE(DNS_ZONE_VALID(zone)); + + UNUSED(task); + + ENTER; + + LOCK_ZONE(zone); + if (((event->ev_attributes & ISC_EVENTATTR_CANCELED) != 0) || + DNS_ZONE_FLAG(zone, DNS_ZONEFLG_EXITING) || + zone->view->requestmgr == NULL) { + if (DNS_ZONE_FLAG(zone, DNS_ZONEFLG_EXITING)) + cancel = ISC_FALSE; + goto cleanup; + } + + /* + * XXX Optimisation: Create message when zone is setup and reuse. + */ + result = create_query(zone, dns_rdatatype_soa, &message); + if (result != ISC_R_SUCCESS) + goto cleanup; + + again: + INSIST(zone->masterscnt > 0); + INSIST(zone->curmaster < zone->masterscnt); + + zone->masteraddr = zone->masters[zone->curmaster]; + + isc_netaddr_fromsockaddr(&masterip, &zone->masteraddr); + /* + * First, look for a tsig key in the master statement, then + * try for a server key. + */ + if ((zone->masterkeynames != NULL) && + (zone->masterkeynames[zone->curmaster] != NULL)) { + dns_view_t *view = dns_zone_getview(zone); + dns_name_t *keyname = zone->masterkeynames[zone->curmaster]; + result = dns_view_gettsig(view, keyname, &key); + if (result != ISC_R_SUCCESS) { + char namebuf[DNS_NAME_FORMATSIZE]; + dns_name_format(keyname, namebuf, sizeof(namebuf)); + dns_zone_log(zone, ISC_LOG_ERROR, + "unable to find key: %s", namebuf); + } + } + if (key == NULL) + (void)dns_view_getpeertsig(zone->view, &masterip, &key); + + have_xfrsource = ISC_FALSE; + if (zone->view->peers != NULL) { + dns_peer_t *peer = NULL; + isc_boolean_t edns; + result = dns_peerlist_peerbyaddr(zone->view->peers, + &masterip, &peer); + if (result == ISC_R_SUCCESS) { + result = dns_peer_getsupportedns(peer, &edns); + if (result == ISC_R_SUCCESS && !edns) + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_NOEDNS); + result = dns_peer_gettransfersource(peer, + &zone->sourceaddr); + if (result == ISC_R_SUCCESS) + have_xfrsource = ISC_TRUE; + if (zone->view->resolver != NULL) + udpsize = + dns_resolver_getudpsize(zone->view->resolver); + (void)dns_peer_getudpsize(peer, &udpsize); + } + } + + switch (isc_sockaddr_pf(&zone->masteraddr)) { + case PF_INET: + if (DNS_ZONE_FLAG(zone, DNS_ZONEFLG_USEALTXFRSRC)) { + if (isc_sockaddr_equal(&zone->altxfrsource4, + &zone->xfrsource4)) + goto skip_master; + zone->sourceaddr = zone->altxfrsource4; + } else if (!have_xfrsource) + zone->sourceaddr = zone->xfrsource4; + break; + case PF_INET6: + if (DNS_ZONE_FLAG(zone, DNS_ZONEFLG_USEALTXFRSRC)) { + if (isc_sockaddr_equal(&zone->altxfrsource6, + &zone->xfrsource6)) + goto skip_master; + zone->sourceaddr = zone->altxfrsource6; + } else if (!have_xfrsource) + zone->sourceaddr = zone->xfrsource6; + break; + default: + result = ISC_R_NOTIMPLEMENTED; + goto cleanup; + } + + options = DNS_ZONE_FLAG(zone, DNS_ZONEFLG_USEVC) ? + DNS_REQUESTOPT_TCP : 0; + + if (!DNS_ZONE_FLAG(zone, DNS_ZONEFLG_NOEDNS)) { + result = add_opt(message, udpsize); + if (result != ISC_R_SUCCESS) + zone_debuglog(zone, me, 1, + "unable to add opt record: %s", + dns_result_totext(result)); + } + + zone_iattach(zone, &dummy); + timeout = 15; + if (DNS_ZONE_FLAG(zone, DNS_ZONEFLG_DIALREFRESH)) + timeout = 30; + result = dns_request_createvia2(zone->view->requestmgr, message, + &zone->sourceaddr, &zone->masteraddr, + options, key, timeout * 3, timeout, + zone->task, refresh_callback, zone, + &zone->request); + if (result != ISC_R_SUCCESS) { + zone_idetach(&dummy); + zone_debuglog(zone, me, 1, + "dns_request_createvia2() failed: %s", + dns_result_totext(result)); + goto cleanup; + } + cancel = ISC_FALSE; + + cleanup: + if (key != NULL) + dns_tsigkey_detach(&key); + if (result != ISC_R_SUCCESS) + DNS_ZONE_CLRFLAG(zone, DNS_ZONEFLG_REFRESH); + if (message != NULL) + dns_message_destroy(&message); + if (cancel) + cancel_refresh(zone); + isc_event_free(&event); + UNLOCK_ZONE(zone); + dns_zone_idetach(&zone); + return; + + skip_master: + if (key != NULL) + dns_tsigkey_detach(&key); + /* + * Skip to next failed / untried master. + */ + do { + zone->curmaster++; + } while (zone->curmaster < zone->masterscnt && + zone->mastersok[zone->curmaster]); + if (zone->curmaster < zone->masterscnt) + goto again; + zone->curmaster = 0; + goto cleanup; +} + +static void +ns_query(dns_zone_t *zone, dns_rdataset_t *soardataset, dns_stub_t *stub) { + const char me[] = "ns_query"; + isc_result_t result; + dns_message_t *message = NULL; + isc_netaddr_t masterip; + dns_tsigkey_t *key = NULL; + dns_dbnode_t *node = NULL; + int timeout; + isc_boolean_t have_xfrsource = ISC_FALSE; + isc_uint16_t udpsize = SEND_BUFFER_SIZE; + + REQUIRE(DNS_ZONE_VALID(zone)); + REQUIRE((soardataset != NULL && stub == NULL) || + (soardataset == NULL && stub != NULL)); + REQUIRE(stub == NULL || DNS_STUB_VALID(stub)); + + ENTER; + + LOCK_ZONE(zone); + if (stub == NULL) { + stub = isc_mem_get(zone->mctx, sizeof(*stub)); + if (stub == NULL) + goto cleanup; + stub->magic = STUB_MAGIC; + stub->mctx = zone->mctx; + stub->zone = NULL; + stub->db = NULL; + stub->version = NULL; + + /* + * Attach so that the zone won't disappear from under us. + */ + zone_iattach(zone, &stub->zone); + + /* + * If a db exists we will update it, otherwise we create a + * new one and attach it to the zone once we have the NS + * RRset and glue. + */ + ZONEDB_LOCK(&zone->dblock, isc_rwlocktype_read); + if (zone->db != NULL) { + dns_db_attach(zone->db, &stub->db); + ZONEDB_UNLOCK(&zone->dblock, isc_rwlocktype_read); + } else { + ZONEDB_UNLOCK(&zone->dblock, isc_rwlocktype_read); + + INSIST(zone->db_argc >= 1); + result = dns_db_create(zone->mctx, zone->db_argv[0], + &zone->origin, dns_dbtype_stub, + zone->rdclass, + zone->db_argc - 1, + zone->db_argv + 1, + &stub->db); + if (result != ISC_R_SUCCESS) { + dns_zone_log(zone, ISC_LOG_ERROR, + "refreshing stub: " + "could not create " + "database: %s", + dns_result_totext(result)); + goto cleanup; + } + dns_db_settask(stub->db, zone->task); + } + + dns_db_newversion(stub->db, &stub->version); + + /* + * Update SOA record. + */ + result = dns_db_findnode(stub->db, &zone->origin, ISC_TRUE, + &node); + if (result != ISC_R_SUCCESS) { + dns_zone_log(zone, ISC_LOG_INFO, + "refreshing stub: " + "dns_db_findnode() failed: %s", + dns_result_totext(result)); + goto cleanup; + } + + result = dns_db_addrdataset(stub->db, node, stub->version, 0, + soardataset, 0, NULL); + dns_db_detachnode(stub->db, &node); + if (result != ISC_R_SUCCESS) { + dns_zone_log(zone, ISC_LOG_INFO, + "refreshing stub: " + "dns_db_addrdataset() failed: %s", + dns_result_totext(result)); + goto cleanup; + } + } + + /* + * XXX Optimisation: Create message when zone is setup and reuse. + */ + result = create_query(zone, dns_rdatatype_ns, &message); + + INSIST(zone->masterscnt > 0); + INSIST(zone->curmaster < zone->masterscnt); + zone->masteraddr = zone->masters[zone->curmaster]; + + isc_netaddr_fromsockaddr(&masterip, &zone->masteraddr); + /* + * First, look for a tsig key in the master statement, then + * try for a server key. + */ + if ((zone->masterkeynames != NULL) && + (zone->masterkeynames[zone->curmaster] != NULL)) { + dns_view_t *view = dns_zone_getview(zone); + dns_name_t *keyname = zone->masterkeynames[zone->curmaster]; + result = dns_view_gettsig(view, keyname, &key); + if (result != ISC_R_SUCCESS) { + char namebuf[DNS_NAME_FORMATSIZE]; + dns_name_format(keyname, namebuf, sizeof(namebuf)); + dns_zone_log(zone, ISC_LOG_ERROR, + "unable to find key: %s", namebuf); + } + } + if (key == NULL) + (void)dns_view_getpeertsig(zone->view, &masterip, &key); + + if (zone->view->peers != NULL) { + dns_peer_t *peer = NULL; + isc_boolean_t edns; + result = dns_peerlist_peerbyaddr(zone->view->peers, + &masterip, &peer); + if (result == ISC_R_SUCCESS) { + result = dns_peer_getsupportedns(peer, &edns); + if (result == ISC_R_SUCCESS && !edns) + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_NOEDNS); + result = dns_peer_gettransfersource(peer, + &zone->sourceaddr); + if (result == ISC_R_SUCCESS) + have_xfrsource = ISC_TRUE; + if (zone->view->resolver != NULL) + udpsize = + dns_resolver_getudpsize(zone->view->resolver); + (void)dns_peer_getudpsize(peer, &udpsize); + } + + } + if (!DNS_ZONE_FLAG(zone, DNS_ZONEFLG_NOEDNS)) { + result = add_opt(message, udpsize); + if (result != ISC_R_SUCCESS) + zone_debuglog(zone, me, 1, + "unable to add opt record: %s", + dns_result_totext(result)); + } + + /* + * Always use TCP so that we shouldn't truncate in additional section. + */ + switch (isc_sockaddr_pf(&zone->masteraddr)) { + case PF_INET: + if (DNS_ZONE_FLAG(zone, DNS_ZONEFLG_USEALTXFRSRC)) + zone->sourceaddr = zone->altxfrsource4; + else if (!have_xfrsource) + zone->sourceaddr = zone->xfrsource4; + break; + case PF_INET6: + if (DNS_ZONE_FLAG(zone, DNS_ZONEFLG_USEALTXFRSRC)) + zone->sourceaddr = zone->altxfrsource6; + else if (!have_xfrsource) + zone->sourceaddr = zone->xfrsource6; + break; + default: + result = ISC_R_NOTIMPLEMENTED; + goto cleanup; + } + timeout = 15; + if (DNS_ZONE_FLAG(zone, DNS_ZONEFLG_DIALREFRESH)) + timeout = 30; + result = dns_request_createvia2(zone->view->requestmgr, message, + &zone->sourceaddr, &zone->masteraddr, + DNS_REQUESTOPT_TCP, key, timeout * 3, + timeout, zone->task, stub_callback, + stub, &zone->request); + if (result != ISC_R_SUCCESS) { + zone_debuglog(zone, me, 1, + "dns_request_createvia() failed: %s", + dns_result_totext(result)); + goto cleanup; + } + dns_message_destroy(&message); + goto unlock; + + cleanup: + cancel_refresh(zone); + if (stub != NULL) { + stub->magic = 0; + if (stub->version != NULL) + dns_db_closeversion(stub->db, &stub->version, + ISC_FALSE); + if (stub->db != NULL) + dns_db_detach(&stub->db); + if (stub->zone != NULL) + zone_idetach(&stub->zone); + isc_mem_put(stub->mctx, stub, sizeof(*stub)); + } + if (message != NULL) + dns_message_destroy(&message); + unlock: + if (key != NULL) + dns_tsigkey_detach(&key); + UNLOCK_ZONE(zone); + return; +} + +/* + * Handle the control event. Note that although this event causes the zone + * to shut down, it is not a shutdown event in the sense of the task library. + */ +static void +zone_shutdown(isc_task_t *task, isc_event_t *event) { + dns_zone_t *zone = (dns_zone_t *) event->ev_arg; + isc_boolean_t free_needed, linked = ISC_FALSE; + + UNUSED(task); + REQUIRE(DNS_ZONE_VALID(zone)); + INSIST(event->ev_type == DNS_EVENT_ZONECONTROL); + INSIST(isc_refcount_current(&zone->erefs) == 0); + zone_debuglog(zone, "zone_shutdown", 3, "shutting down"); + + /* + * Stop things being restarted after we cancel them below. + */ + LOCK_ZONE(zone); + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_EXITING); + UNLOCK_ZONE(zone); + + /* + * If we were waiting for xfrin quota, step out of + * the queue. + * If there's no zone manager, we can't be waiting for the + * xfrin quota + */ + if (zone->zmgr != NULL) { + RWLOCK(&zone->zmgr->rwlock, isc_rwlocktype_write); + if (zone->statelist == &zone->zmgr->waiting_for_xfrin) { + ISC_LIST_UNLINK(zone->zmgr->waiting_for_xfrin, zone, + statelink); + linked = ISC_TRUE; + zone->statelist = NULL; + } + RWUNLOCK(&zone->zmgr->rwlock, isc_rwlocktype_write); + } + + /* + * In task context, no locking required. See zone_xfrdone(). + */ + if (zone->xfr != NULL) + dns_xfrin_shutdown(zone->xfr); + + LOCK_ZONE(zone); + if (linked) { + INSIST(zone->irefs > 0); + zone->irefs--; + } + if (zone->request != NULL) { + dns_request_cancel(zone->request); + } + + if (zone->readio != NULL) + zonemgr_cancelio(zone->readio); + + if (zone->lctx != NULL) + dns_loadctx_cancel(zone->lctx); + + if (!DNS_ZONE_FLAG(zone, DNS_ZONEFLG_FLUSH) || + !DNS_ZONE_FLAG(zone, DNS_ZONEFLG_DUMPING)) { + if (zone->writeio != NULL) + zonemgr_cancelio(zone->writeio); + + if (zone->dctx != NULL) + dns_dumpctx_cancel(zone->dctx); + } + + notify_cancel(zone); + + if (zone->timer != NULL) { + isc_timer_detach(&zone->timer); + INSIST(zone->irefs > 0); + zone->irefs--; + } + + if (zone->view != NULL) + dns_view_weakdetach(&zone->view); + + /* + * We have now canceled everything set the flag to allow exit_check() + * to succeed. We must not unlock between setting this flag and + * calling exit_check(). + */ + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_SHUTDOWN); + free_needed = exit_check(zone); + UNLOCK_ZONE(zone); + if (free_needed) + zone_free(zone); +} + +static void +zone_timer(isc_task_t *task, isc_event_t *event) { + const char me[] = "zone_timer"; + dns_zone_t *zone = (dns_zone_t *)event->ev_arg; + + UNUSED(task); + REQUIRE(DNS_ZONE_VALID(zone)); + + ENTER; + + zone_maintenance(zone); + + isc_event_free(&event); +} + +static void +zone_settimer(dns_zone_t *zone, isc_time_t *now) { + const char me[] = "zone_settimer"; + isc_time_t next; + isc_result_t result; + + REQUIRE(DNS_ZONE_VALID(zone)); + if (DNS_ZONE_FLAG(zone, DNS_ZONEFLG_EXITING)) + return; + + isc_time_settoepoch(&next); + + switch (zone->type) { + case dns_zone_master: + if (DNS_ZONE_FLAG(zone, DNS_ZONEFLG_NEEDNOTIFY)) + next = zone->notifytime; + if (DNS_ZONE_FLAG(zone, DNS_ZONEFLG_NEEDDUMP) && + !DNS_ZONE_FLAG(zone, DNS_ZONEFLG_DUMPING)) { + INSIST(!isc_time_isepoch(&zone->dumptime)); + if (isc_time_isepoch(&next) || + isc_time_compare(&zone->dumptime, &next) < 0) + next = zone->dumptime; + } + break; + + case dns_zone_slave: + if (DNS_ZONE_FLAG(zone, DNS_ZONEFLG_NEEDNOTIFY)) + next = zone->notifytime; + /*FALLTHROUGH*/ + + case dns_zone_stub: + if (!DNS_ZONE_FLAG(zone, DNS_ZONEFLG_REFRESH) && + !DNS_ZONE_FLAG(zone, DNS_ZONEFLG_NOMASTERS) && + !DNS_ZONE_FLAG(zone, DNS_ZONEFLG_NOREFRESH) && + !DNS_ZONE_FLAG(zone, DNS_ZONEFLG_LOADING)) { + INSIST(!isc_time_isepoch(&zone->refreshtime)); + if (isc_time_isepoch(&next) || + isc_time_compare(&zone->refreshtime, &next) < 0) + next = zone->refreshtime; + } + if (DNS_ZONE_FLAG(zone, DNS_ZONEFLG_LOADED)) { + INSIST(!isc_time_isepoch(&zone->expiretime)); + if (isc_time_isepoch(&next) || + isc_time_compare(&zone->expiretime, &next) < 0) + next = zone->expiretime; + } + if (DNS_ZONE_FLAG(zone, DNS_ZONEFLG_NEEDDUMP) && + !DNS_ZONE_FLAG(zone, DNS_ZONEFLG_DUMPING)) { + INSIST(!isc_time_isepoch(&zone->dumptime)); + if (isc_time_isepoch(&next) || + isc_time_compare(&zone->dumptime, &next) < 0) + next = zone->dumptime; + } + break; + + default: + break; + } + + if (isc_time_isepoch(&next)) { + zone_debuglog(zone, me, 10, "settimer inactive"); + result = isc_timer_reset(zone->timer, isc_timertype_inactive, + NULL, NULL, ISC_TRUE); + if (result != ISC_R_SUCCESS) + dns_zone_log(zone, ISC_LOG_ERROR, + "could not deactivate zone timer: %s", + isc_result_totext(result)); + } else { + if (isc_time_compare(&next, now) <= 0) + next = *now; + result = isc_timer_reset(zone->timer, isc_timertype_once, + &next, NULL, ISC_TRUE); + if (result != ISC_R_SUCCESS) + dns_zone_log(zone, ISC_LOG_ERROR, + "could not reset zone timer: %s", + isc_result_totext(result)); + } +} + +static void +cancel_refresh(dns_zone_t *zone) { + const char me[] = "cancel_refresh"; + isc_time_t now; + + /* + * 'zone' locked by caller. + */ + + REQUIRE(DNS_ZONE_VALID(zone)); + REQUIRE(LOCKED_ZONE(zone)); + + ENTER; + + DNS_ZONE_CLRFLAG(zone, DNS_ZONEFLG_REFRESH); + TIME_NOW(&now); + zone_settimer(zone, &now); +} + +static isc_result_t +notify_createmessage(dns_zone_t *zone, unsigned int flags, + dns_message_t **messagep) +{ + dns_db_t *zonedb = NULL; + dns_dbnode_t *node = NULL; + dns_dbversion_t *version = NULL; + dns_message_t *message = NULL; + dns_rdataset_t rdataset; + dns_rdata_t rdata = DNS_RDATA_INIT; + + dns_name_t *tempname = NULL; + dns_rdata_t *temprdata = NULL; + dns_rdatalist_t *temprdatalist = NULL; + dns_rdataset_t *temprdataset = NULL; + + isc_result_t result; + isc_region_t r; + isc_buffer_t *b = NULL; + + REQUIRE(DNS_ZONE_VALID(zone)); + REQUIRE(messagep != NULL && *messagep == NULL); + + result = dns_message_create(zone->mctx, DNS_MESSAGE_INTENTRENDER, + &message); + if (result != ISC_R_SUCCESS) + return (result); + + message->opcode = dns_opcode_notify; + message->flags |= DNS_MESSAGEFLAG_AA; + message->rdclass = zone->rdclass; + + result = dns_message_gettempname(message, &tempname); + if (result != ISC_R_SUCCESS) + goto cleanup; + + result = dns_message_gettemprdataset(message, &temprdataset); + if (result != ISC_R_SUCCESS) + goto cleanup; + + /* + * Make question. + */ + dns_name_init(tempname, NULL); + dns_name_clone(&zone->origin, tempname); + dns_rdataset_init(temprdataset); + dns_rdataset_makequestion(temprdataset, zone->rdclass, + dns_rdatatype_soa); + ISC_LIST_APPEND(tempname->list, temprdataset, link); + dns_message_addname(message, tempname, DNS_SECTION_QUESTION); + tempname = NULL; + temprdataset = NULL; + + if ((flags & DNS_NOTIFY_NOSOA) != 0) + goto done; + + result = dns_message_gettempname(message, &tempname); + if (result != ISC_R_SUCCESS) + goto soa_cleanup; + result = dns_message_gettemprdata(message, &temprdata); + if (result != ISC_R_SUCCESS) + goto soa_cleanup; + result = dns_message_gettemprdataset(message, &temprdataset); + if (result != ISC_R_SUCCESS) + goto soa_cleanup; + result = dns_message_gettemprdatalist(message, &temprdatalist); + if (result != ISC_R_SUCCESS) + goto soa_cleanup; + + ZONEDB_LOCK(&zone->dblock, isc_rwlocktype_read); + INSIST(zone->db != NULL); /* XXXJT: is this assumption correct? */ + dns_db_attach(zone->db, &zonedb); + ZONEDB_UNLOCK(&zone->dblock, isc_rwlocktype_read); + + dns_name_init(tempname, NULL); + dns_name_clone(&zone->origin, tempname); + dns_db_currentversion(zonedb, &version); + result = dns_db_findnode(zonedb, tempname, ISC_FALSE, &node); + if (result != ISC_R_SUCCESS) + goto soa_cleanup; + + dns_rdataset_init(&rdataset); + result = dns_db_findrdataset(zonedb, node, version, + dns_rdatatype_soa, + dns_rdatatype_none, 0, &rdataset, + NULL); + if (result != ISC_R_SUCCESS) + goto soa_cleanup; + result = dns_rdataset_first(&rdataset); + if (result != ISC_R_SUCCESS) + goto soa_cleanup; + dns_rdataset_current(&rdataset, &rdata); + dns_rdata_toregion(&rdata, &r); + result = isc_buffer_allocate(zone->mctx, &b, r.length); + if (result != ISC_R_SUCCESS) + goto soa_cleanup; + isc_buffer_putmem(b, r.base, r.length); + isc_buffer_usedregion(b, &r); + dns_rdata_init(temprdata); + dns_rdata_fromregion(temprdata, rdata.rdclass, rdata.type, &r); + dns_message_takebuffer(message, &b); + result = dns_rdataset_next(&rdataset); + dns_rdataset_disassociate(&rdataset); + if (result != ISC_R_NOMORE) + goto soa_cleanup; + temprdatalist->rdclass = rdata.rdclass; + temprdatalist->type = rdata.type; + temprdatalist->covers = 0; + temprdatalist->ttl = rdataset.ttl; + ISC_LIST_INIT(temprdatalist->rdata); + ISC_LIST_APPEND(temprdatalist->rdata, temprdata, link); + + dns_rdataset_init(temprdataset); + result = dns_rdatalist_tordataset(temprdatalist, temprdataset); + if (result != ISC_R_SUCCESS) + goto soa_cleanup; + + ISC_LIST_APPEND(tempname->list, temprdataset, link); + dns_message_addname(message, tempname, DNS_SECTION_ANSWER); + temprdatalist = NULL; + temprdataset = NULL; + temprdata = NULL; + tempname = NULL; + + soa_cleanup: + if (node != NULL) + dns_db_detachnode(zonedb, &node); + if (version != NULL) + dns_db_closeversion(zonedb, &version, ISC_FALSE); + if (zonedb != NULL) + dns_db_detach(&zonedb); + if (tempname != NULL) + dns_message_puttempname(message, &tempname); + if (temprdata != NULL) + dns_message_puttemprdata(message, &temprdata); + if (temprdataset != NULL) + dns_message_puttemprdataset(message, &temprdataset); + if (temprdatalist != NULL) + dns_message_puttemprdatalist(message, &temprdatalist); + + done: + *messagep = message; + return (ISC_R_SUCCESS); + + cleanup: + if (tempname != NULL) + dns_message_puttempname(message, &tempname); + if (temprdataset != NULL) + dns_message_puttemprdataset(message, &temprdataset); + dns_message_destroy(&message); + return (result); +} + +isc_result_t +dns_zone_notifyreceive(dns_zone_t *zone, isc_sockaddr_t *from, + dns_message_t *msg) +{ + unsigned int i; + dns_rdata_soa_t soa; + dns_rdataset_t *rdataset = NULL; + dns_rdata_t rdata = DNS_RDATA_INIT; + isc_result_t result; + char fromtext[ISC_SOCKADDR_FORMATSIZE]; + int match = 0; + isc_netaddr_t netaddr; + + REQUIRE(DNS_ZONE_VALID(zone)); + + /* + * If type != T_SOA return DNS_R_REFUSED. We don't yet support + * ROLLOVER. + * + * SOA: RFC1996 + * Check that 'from' is a valid notify source, (zone->masters). + * Return DNS_R_REFUSED if not. + * + * If the notify message contains a serial number check it + * against the zones serial and return if <= current serial + * + * If a refresh check is progress, if so just record the + * fact we received a NOTIFY and from where and return. + * We will perform a new refresh check when the current one + * completes. Return ISC_R_SUCCESS. + * + * Otherwise initiate a refresh check using 'from' as the + * first address to check. Return ISC_R_SUCCESS. + */ + + isc_sockaddr_format(from, fromtext, sizeof(fromtext)); + + /* + * We only handle NOTIFY (SOA) at the present. + */ + LOCK_ZONE(zone); + if (msg->counts[DNS_SECTION_QUESTION] == 0 || + dns_message_findname(msg, DNS_SECTION_QUESTION, &zone->origin, + dns_rdatatype_soa, dns_rdatatype_none, + NULL, NULL) != ISC_R_SUCCESS) { + UNLOCK_ZONE(zone); + if (msg->counts[DNS_SECTION_QUESTION] == 0) { + dns_zone_log(zone, ISC_LOG_NOTICE, + "NOTIFY with no " + "question section from: %s", fromtext); + return (DNS_R_FORMERR); + } + dns_zone_log(zone, ISC_LOG_NOTICE, + "NOTIFY zone does not match"); + return (DNS_R_NOTIMP); + } + + /* + * If we are a master zone just succeed. + */ + if (zone->type == dns_zone_master) { + UNLOCK_ZONE(zone); + return (ISC_R_SUCCESS); + } + + isc_netaddr_fromsockaddr(&netaddr, from); + for (i = 0; i < zone->masterscnt; i++) { + if (isc_sockaddr_eqaddr(from, &zone->masters[i])) + break; + if (zone->view->aclenv.match_mapped && + IN6_IS_ADDR_V4MAPPED(&from->type.sin6.sin6_addr) && + isc_sockaddr_pf(&zone->masters[i]) == AF_INET) { + isc_netaddr_t na1, na2; + isc_netaddr_fromv4mapped(&na1, &netaddr); + isc_netaddr_fromsockaddr(&na2, &zone->masters[i]); + if (isc_netaddr_equal(&na1, &na2)) + break; + } + } + + /* + * Accept notify requests from non masters if they are on + * 'zone->notify_acl'. + */ + if (i >= zone->masterscnt && zone->notify_acl != NULL && + dns_acl_match(&netaddr, NULL, zone->notify_acl, + &zone->view->aclenv, + &match, NULL) == ISC_R_SUCCESS && + match > 0) + { + /* Accept notify. */ + } else if (i >= zone->masterscnt) { + UNLOCK_ZONE(zone); + dns_zone_log(zone, ISC_LOG_INFO, + "refused notify from non-master: %s", fromtext); + return (DNS_R_REFUSED); + } + + /* + * If the zone is loaded and there are answers check the serial + * to see if we need to do a refresh. Do not worry about this + * check if we are a dialup zone as we use the notify request + * to trigger a refresh check. + */ + if (msg->counts[DNS_SECTION_ANSWER] > 0 && + DNS_ZONE_FLAG(zone, DNS_ZONEFLG_LOADED) && + !DNS_ZONE_FLAG(zone, DNS_ZONEFLG_NOREFRESH)) { + result = dns_message_findname(msg, DNS_SECTION_ANSWER, + &zone->origin, + dns_rdatatype_soa, + dns_rdatatype_none, NULL, + &rdataset); + if (result == ISC_R_SUCCESS) + result = dns_rdataset_first(rdataset); + if (result == ISC_R_SUCCESS) { + isc_uint32_t serial = 0; + + dns_rdataset_current(rdataset, &rdata); + result = dns_rdata_tostruct(&rdata, &soa, NULL); + RUNTIME_CHECK(result == ISC_R_SUCCESS); + serial = soa.serial; + if (isc_serial_le(serial, zone->serial)) { + dns_zone_log(zone, ISC_LOG_INFO, + "notify from %s: " + "zone is up to date", + fromtext); + UNLOCK_ZONE(zone); + return (ISC_R_SUCCESS); + } + } + } + + /* + * If we got this far and there was a refresh in progress just + * let it complete. Record where we got the notify from so we + * can perform a refresh check when the current one completes + */ + if (DNS_ZONE_FLAG(zone, DNS_ZONEFLG_REFRESH)) { + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_NEEDREFRESH); + zone->notifyfrom = *from; + UNLOCK_ZONE(zone); + dns_zone_log(zone, ISC_LOG_INFO, + "notify from %s: refresh in progress, " + "refresh check queued", + fromtext); + return (ISC_R_SUCCESS); + } + zone->notifyfrom = *from; + UNLOCK_ZONE(zone); + dns_zone_refresh(zone); + return (ISC_R_SUCCESS); +} + +void +dns_zone_setnotifyacl(dns_zone_t *zone, dns_acl_t *acl) { + + REQUIRE(DNS_ZONE_VALID(zone)); + + LOCK_ZONE(zone); + if (zone->notify_acl != NULL) + dns_acl_detach(&zone->notify_acl); + dns_acl_attach(acl, &zone->notify_acl); + UNLOCK_ZONE(zone); +} + +void +dns_zone_setqueryacl(dns_zone_t *zone, dns_acl_t *acl) { + + REQUIRE(DNS_ZONE_VALID(zone)); + + LOCK_ZONE(zone); + if (zone->query_acl != NULL) + dns_acl_detach(&zone->query_acl); + dns_acl_attach(acl, &zone->query_acl); + UNLOCK_ZONE(zone); +} + +void +dns_zone_setupdateacl(dns_zone_t *zone, dns_acl_t *acl) { + + REQUIRE(DNS_ZONE_VALID(zone)); + + LOCK_ZONE(zone); + if (zone->update_acl != NULL) + dns_acl_detach(&zone->update_acl); + dns_acl_attach(acl, &zone->update_acl); + UNLOCK_ZONE(zone); +} + +void +dns_zone_setforwardacl(dns_zone_t *zone, dns_acl_t *acl) { + + REQUIRE(DNS_ZONE_VALID(zone)); + + LOCK_ZONE(zone); + if (zone->forward_acl != NULL) + dns_acl_detach(&zone->forward_acl); + dns_acl_attach(acl, &zone->forward_acl); + UNLOCK_ZONE(zone); +} + +void +dns_zone_setxfracl(dns_zone_t *zone, dns_acl_t *acl) { + + REQUIRE(DNS_ZONE_VALID(zone)); + + LOCK_ZONE(zone); + if (zone->xfr_acl != NULL) + dns_acl_detach(&zone->xfr_acl); + dns_acl_attach(acl, &zone->xfr_acl); + UNLOCK_ZONE(zone); +} + +dns_acl_t * +dns_zone_getnotifyacl(dns_zone_t *zone) { + + REQUIRE(DNS_ZONE_VALID(zone)); + + return (zone->notify_acl); +} + +dns_acl_t * +dns_zone_getqueryacl(dns_zone_t *zone) { + + REQUIRE(DNS_ZONE_VALID(zone)); + + return (zone->query_acl); +} + +dns_acl_t * +dns_zone_getupdateacl(dns_zone_t *zone) { + + REQUIRE(DNS_ZONE_VALID(zone)); + + return (zone->update_acl); +} + +dns_acl_t * +dns_zone_getforwardacl(dns_zone_t *zone) { + + REQUIRE(DNS_ZONE_VALID(zone)); + + return (zone->forward_acl); +} + +dns_acl_t * +dns_zone_getxfracl(dns_zone_t *zone) { + + REQUIRE(DNS_ZONE_VALID(zone)); + + return (zone->xfr_acl); +} + +void +dns_zone_clearupdateacl(dns_zone_t *zone) { + + REQUIRE(DNS_ZONE_VALID(zone)); + + LOCK_ZONE(zone); + if (zone->update_acl != NULL) + dns_acl_detach(&zone->update_acl); + UNLOCK_ZONE(zone); +} + +void +dns_zone_clearforwardacl(dns_zone_t *zone) { + + REQUIRE(DNS_ZONE_VALID(zone)); + + LOCK_ZONE(zone); + if (zone->forward_acl != NULL) + dns_acl_detach(&zone->forward_acl); + UNLOCK_ZONE(zone); +} + +void +dns_zone_clearnotifyacl(dns_zone_t *zone) { + + REQUIRE(DNS_ZONE_VALID(zone)); + + LOCK_ZONE(zone); + if (zone->notify_acl != NULL) + dns_acl_detach(&zone->notify_acl); + UNLOCK_ZONE(zone); +} + +void +dns_zone_clearqueryacl(dns_zone_t *zone) { + + REQUIRE(DNS_ZONE_VALID(zone)); + + LOCK_ZONE(zone); + if (zone->query_acl != NULL) + dns_acl_detach(&zone->query_acl); + UNLOCK_ZONE(zone); +} + +void +dns_zone_clearxfracl(dns_zone_t *zone) { + + REQUIRE(DNS_ZONE_VALID(zone)); + + LOCK_ZONE(zone); + if (zone->xfr_acl != NULL) + dns_acl_detach(&zone->xfr_acl); + UNLOCK_ZONE(zone); +} + +isc_boolean_t +dns_zone_getupdatedisabled(dns_zone_t *zone) { + REQUIRE(DNS_ZONE_VALID(zone)); + return (zone->update_disabled); + +} + +void +dns_zone_setupdatedisabled(dns_zone_t *zone, isc_boolean_t state) { + REQUIRE(DNS_ZONE_VALID(zone)); + zone->update_disabled = state; +} + +isc_boolean_t +dns_zone_getzeronosoattl(dns_zone_t *zone) { + REQUIRE(DNS_ZONE_VALID(zone)); + return (zone->zero_no_soa_ttl); + +} + +void +dns_zone_setzeronosoattl(dns_zone_t *zone, isc_boolean_t state) { + REQUIRE(DNS_ZONE_VALID(zone)); + zone->zero_no_soa_ttl = state; +} + +void +dns_zone_setchecknames(dns_zone_t *zone, dns_severity_t severity) { + + REQUIRE(DNS_ZONE_VALID(zone)); + + zone->check_names = severity; +} + +dns_severity_t +dns_zone_getchecknames(dns_zone_t *zone) { + + REQUIRE(DNS_ZONE_VALID(zone)); + + return (zone->check_names); +} + +void +dns_zone_setjournalsize(dns_zone_t *zone, isc_int32_t size) { + + REQUIRE(DNS_ZONE_VALID(zone)); + + zone->journalsize = size; +} + +isc_int32_t +dns_zone_getjournalsize(dns_zone_t *zone) { + + REQUIRE(DNS_ZONE_VALID(zone)); + + return (zone->journalsize); +} + +static void +zone_tostr(dns_zone_t *zone, char *buf, size_t length) { + isc_result_t result = ISC_R_FAILURE; + isc_buffer_t buffer; + + REQUIRE(buf != NULL); + REQUIRE(length > 1U); + + /* + * Leave space for terminating '\0'. + */ + isc_buffer_init(&buffer, buf, length - 1); + if (dns_name_dynamic(&zone->origin)) + result = dns_name_totext(&zone->origin, ISC_TRUE, &buffer); + if (result != ISC_R_SUCCESS && + isc_buffer_availablelength(&buffer) >= (sizeof("<UNKNOWN>") - 1)) + isc_buffer_putstr(&buffer, "<UNKNOWN>"); + + if (isc_buffer_availablelength(&buffer) > 0) + isc_buffer_putstr(&buffer, "/"); + (void)dns_rdataclass_totext(zone->rdclass, &buffer); + + if (zone->view != NULL && strcmp(zone->view->name, "_bind") != 0 && + strcmp(zone->view->name, "_default") != 0 && + strlen(zone->view->name) < isc_buffer_availablelength(&buffer)) { + isc_buffer_putstr(&buffer, "/"); + isc_buffer_putstr(&buffer, zone->view->name); + } + + buf[isc_buffer_usedlength(&buffer)] = '\0'; +} + +void +dns_zone_name(dns_zone_t *zone, char *buf, size_t length) { + REQUIRE(DNS_ZONE_VALID(zone)); + REQUIRE(buf != NULL); + zone_tostr(zone, buf, length); +} + +static void +notify_log(dns_zone_t *zone, int level, const char *fmt, ...) { + va_list ap; + char message[4096]; + char namebuf[1024+32]; + + if (isc_log_wouldlog(dns_lctx, level) == ISC_FALSE) + return; + + zone_tostr(zone, namebuf, sizeof(namebuf)); + + va_start(ap, fmt); + vsnprintf(message, sizeof(message), fmt, ap); + va_end(ap); + isc_log_write(dns_lctx, DNS_LOGCATEGORY_NOTIFY, DNS_LOGMODULE_ZONE, + level, "zone %s: %s", namebuf, message); +} + +void +dns_zone_logc(dns_zone_t *zone, isc_logcategory_t *category, + int level, const char *fmt, ...) { + va_list ap; + char message[4096]; + char namebuf[1024+32]; + + if (isc_log_wouldlog(dns_lctx, level) == ISC_FALSE) + return; + + zone_tostr(zone, namebuf, sizeof(namebuf)); + + va_start(ap, fmt); + vsnprintf(message, sizeof(message), fmt, ap); + va_end(ap); + isc_log_write(dns_lctx, category, DNS_LOGMODULE_ZONE, + level, "zone %s: %s", namebuf, message); +} + +void +dns_zone_log(dns_zone_t *zone, int level, const char *fmt, ...) { + va_list ap; + char message[4096]; + char namebuf[1024+32]; + + if (isc_log_wouldlog(dns_lctx, level) == ISC_FALSE) + return; + + zone_tostr(zone, namebuf, sizeof(namebuf)); + + va_start(ap, fmt); + vsnprintf(message, sizeof(message), fmt, ap); + va_end(ap); + isc_log_write(dns_lctx, DNS_LOGCATEGORY_GENERAL, DNS_LOGMODULE_ZONE, + level, "zone %s: %s", namebuf, message); +} + +static void +zone_debuglog(dns_zone_t *zone, const char *me, int debuglevel, + const char *fmt, ...) +{ + va_list ap; + char message[4096]; + char namebuf[1024+32]; + int level = ISC_LOG_DEBUG(debuglevel); + + if (isc_log_wouldlog(dns_lctx, level) == ISC_FALSE) + return; + + zone_tostr(zone, namebuf, sizeof(namebuf)); + + va_start(ap, fmt); + vsnprintf(message, sizeof(message), fmt, ap); + va_end(ap); + isc_log_write(dns_lctx, DNS_LOGCATEGORY_GENERAL, DNS_LOGMODULE_ZONE, + level, "%s: zone %s: %s", me, namebuf, message); +} + +static int +message_count(dns_message_t *msg, dns_section_t section, dns_rdatatype_t type) +{ + isc_result_t result; + dns_name_t *name; + dns_rdataset_t *curr; + int count = 0; + + result = dns_message_firstname(msg, section); + while (result == ISC_R_SUCCESS) { + name = NULL; + dns_message_currentname(msg, section, &name); + + for (curr = ISC_LIST_TAIL(name->list); curr != NULL; + curr = ISC_LIST_PREV(curr, link)) { + if (curr->type == type) + count++; + } + result = dns_message_nextname(msg, section); + } + + return (count); +} + +void +dns_zone_setmaxxfrin(dns_zone_t *zone, isc_uint32_t maxxfrin) { + REQUIRE(DNS_ZONE_VALID(zone)); + + zone->maxxfrin = maxxfrin; +} + +isc_uint32_t +dns_zone_getmaxxfrin(dns_zone_t *zone) { + REQUIRE(DNS_ZONE_VALID(zone)); + + return (zone->maxxfrin); +} + +void +dns_zone_setmaxxfrout(dns_zone_t *zone, isc_uint32_t maxxfrout) { + REQUIRE(DNS_ZONE_VALID(zone)); + zone->maxxfrout = maxxfrout; +} + +isc_uint32_t +dns_zone_getmaxxfrout(dns_zone_t *zone) { + REQUIRE(DNS_ZONE_VALID(zone)); + + return (zone->maxxfrout); +} + +dns_zonetype_t +dns_zone_gettype(dns_zone_t *zone) { + REQUIRE(DNS_ZONE_VALID(zone)); + + return (zone->type); +} + +dns_name_t * +dns_zone_getorigin(dns_zone_t *zone) { + REQUIRE(DNS_ZONE_VALID(zone)); + + return (&zone->origin); +} + +void +dns_zone_settask(dns_zone_t *zone, isc_task_t *task) { + REQUIRE(DNS_ZONE_VALID(zone)); + + LOCK_ZONE(zone); + if (zone->task != NULL) + isc_task_detach(&zone->task); + isc_task_attach(task, &zone->task); + ZONEDB_LOCK(&zone->dblock, isc_rwlocktype_read); + if (zone->db != NULL) + dns_db_settask(zone->db, zone->task); + ZONEDB_UNLOCK(&zone->dblock, isc_rwlocktype_read); + UNLOCK_ZONE(zone); +} + +void +dns_zone_gettask(dns_zone_t *zone, isc_task_t **target) { + REQUIRE(DNS_ZONE_VALID(zone)); + isc_task_attach(zone->task, target); +} + +void +dns_zone_setidlein(dns_zone_t *zone, isc_uint32_t idlein) { + REQUIRE(DNS_ZONE_VALID(zone)); + + if (idlein == 0) + idlein = DNS_DEFAULT_IDLEIN; + zone->idlein = idlein; +} + +isc_uint32_t +dns_zone_getidlein(dns_zone_t *zone) { + REQUIRE(DNS_ZONE_VALID(zone)); + + return (zone->idlein); +} + +void +dns_zone_setidleout(dns_zone_t *zone, isc_uint32_t idleout) { + REQUIRE(DNS_ZONE_VALID(zone)); + + zone->idleout = idleout; +} + +isc_uint32_t +dns_zone_getidleout(dns_zone_t *zone) { + REQUIRE(DNS_ZONE_VALID(zone)); + + return (zone->idleout); +} + +static void +notify_done(isc_task_t *task, isc_event_t *event) { + dns_requestevent_t *revent = (dns_requestevent_t *)event; + dns_notify_t *notify; + isc_result_t result; + dns_message_t *message = NULL; + isc_buffer_t buf; + char rcode[128]; + char addrbuf[ISC_SOCKADDR_FORMATSIZE]; + + UNUSED(task); + + notify = event->ev_arg; + REQUIRE(DNS_NOTIFY_VALID(notify)); + INSIST(task == notify->zone->task); + + isc_buffer_init(&buf, rcode, sizeof(rcode)); + isc_sockaddr_format(¬ify->dst, addrbuf, sizeof(addrbuf)); + + result = revent->result; + if (result == ISC_R_SUCCESS) + result = dns_message_create(notify->zone->mctx, + DNS_MESSAGE_INTENTPARSE, &message); + if (result == ISC_R_SUCCESS) + result = dns_request_getresponse(revent->request, message, + DNS_MESSAGEPARSE_PRESERVEORDER); + if (result == ISC_R_SUCCESS) + result = dns_rcode_totext(message->rcode, &buf); + if (result == ISC_R_SUCCESS) + notify_log(notify->zone, ISC_LOG_DEBUG(3), + "notify response from %s: %.*s", + addrbuf, (int)buf.used, rcode); + else + notify_log(notify->zone, ISC_LOG_DEBUG(2), + "notify to %s failed: %s", addrbuf, + dns_result_totext(result)); + + /* + * Old bind's return formerr if they see a soa record. Retry w/o + * the soa if we see a formerr and had sent a SOA. + */ + isc_event_free(&event); + if (message != NULL && message->rcode == dns_rcode_formerr && + (notify->flags & DNS_NOTIFY_NOSOA) == 0) { + notify->flags |= DNS_NOTIFY_NOSOA; + dns_request_destroy(¬ify->request); + result = notify_send_queue(notify); + if (result != ISC_R_SUCCESS) + notify_destroy(notify, ISC_FALSE); + } else { + if (result == ISC_R_TIMEDOUT) + notify_log(notify->zone, ISC_LOG_DEBUG(1), + "notify to %s: retries exceeded", addrbuf); + notify_destroy(notify, ISC_FALSE); + } + if (message != NULL) + dns_message_destroy(&message); +} + +isc_result_t +dns_zone_replacedb(dns_zone_t *zone, dns_db_t *db, isc_boolean_t dump) { + isc_result_t result; + + REQUIRE(DNS_ZONE_VALID(zone)); + LOCK_ZONE(zone); + ZONEDB_LOCK(&zone->dblock, isc_rwlocktype_write); + result = zone_replacedb(zone, db, dump); + ZONEDB_UNLOCK(&zone->dblock, isc_rwlocktype_write); + UNLOCK_ZONE(zone); + return (result); +} + +static isc_result_t +zone_replacedb(dns_zone_t *zone, dns_db_t *db, isc_boolean_t dump) { + dns_dbversion_t *ver; + isc_result_t result; + unsigned int soacount = 0; + unsigned int nscount = 0; + + /* + * 'zone' and 'zonedb' locked by caller. + */ + REQUIRE(DNS_ZONE_VALID(zone)); + REQUIRE(LOCKED_ZONE(zone)); + + result = zone_get_from_db(zone, db, &nscount, &soacount, + NULL, NULL, NULL, NULL, NULL, NULL); + if (result == ISC_R_SUCCESS) { + if (soacount != 1) { + dns_zone_log(zone, ISC_LOG_ERROR, + "has %d SOA records", soacount); + result = DNS_R_BADZONE; + } + if (nscount == 0) { + dns_zone_log(zone, ISC_LOG_ERROR, "has no NS records"); + result = DNS_R_BADZONE; + } + if (result != ISC_R_SUCCESS) + return (result); + } else { + dns_zone_log(zone, ISC_LOG_ERROR, + "retrieving SOA and NS records failed: %s", + dns_result_totext(result)); + return (result); + } + + ver = NULL; + dns_db_currentversion(db, &ver); + + /* + * The initial version of a slave zone is always dumped; + * subsequent versions may be journalled instead if this + * is enabled in the configuration. + */ + if (zone->db != NULL && zone->journal != NULL && + DNS_ZONE_OPTION(zone, DNS_ZONEOPT_IXFRFROMDIFFS) && + !DNS_ZONE_FLAG(zone, DNS_ZONEFLG_FORCEXFER)) { + isc_uint32_t serial; + + dns_zone_log(zone, ISC_LOG_DEBUG(3), "generating diffs"); + + result = dns_db_getsoaserial(db, ver, &serial); + if (result != ISC_R_SUCCESS) { + dns_zone_log(zone, ISC_LOG_ERROR, + "ixfr-from-differences: unable to get " + "new serial"); + goto fail; + } + + /* + * This is checked in zone_postload() for master zones. + */ + if (zone->type == dns_zone_slave && + !isc_serial_gt(serial, zone->serial)) { + isc_uint32_t serialmin, serialmax; + serialmin = (zone->serial + 1) & 0xffffffffU; + serialmax = (zone->serial + 0x7fffffffU) & 0xffffffffU; + dns_zone_log(zone, ISC_LOG_ERROR, + "ixfr-from-differences: failed: " + "new serial (%u) out of range [%u - %u]", + serial, serialmin, serialmax); + result = ISC_R_RANGE; + goto fail; + } + + result = dns_db_diff(zone->mctx, db, ver, zone->db, NULL, + zone->journal); + if (result != ISC_R_SUCCESS) + goto fail; + if (dump) + zone_needdump(zone, DNS_DUMP_DELAY); + else if (zone->journalsize != -1) { + result = dns_journal_compact(zone->mctx, zone->journal, + serial, zone->journalsize); + switch (result) { + case ISC_R_SUCCESS: + case ISC_R_NOSPACE: + case ISC_R_NOTFOUND: + dns_zone_log(zone, ISC_LOG_DEBUG(3), + "dns_journal_compact: %s", + dns_result_totext(result)); + break; + default: + dns_zone_log(zone, ISC_LOG_ERROR, + "dns_journal_compact failed: %s", + dns_result_totext(result)); + break; + } + } + } else { + if (dump && zone->masterfile != NULL) { + isc_log_write(dns_lctx, DNS_LOGCATEGORY_GENERAL, + DNS_LOGMODULE_ZONE, ISC_LOG_DEBUG(3), + "dumping new zone version"); + result = dns_db_dump2(db, ver, zone->masterfile, + zone->masterformat); + if (result != ISC_R_SUCCESS) + goto fail; + + /* + * Update the time the zone was updated, so + * dns_zone_load can avoid loading it when + * the server is reloaded. If isc_time_now + * fails for some reason, all that happens is + * the timestamp is not updated. + */ + TIME_NOW(&zone->loadtime); + } + + if (dump && zone->journal != NULL) { + /* + * The in-memory database just changed, and + * because 'dump' is set, it didn't change by + * being loaded from disk. Also, we have not + * journalled diffs for this change. + * Therefore, the on-disk journal is missing + * the deltas for this change. Since it can + * no longer be used to bring the zone + * up-to-date, it is useless and should be + * removed. + */ + isc_log_write(dns_lctx, DNS_LOGCATEGORY_GENERAL, + DNS_LOGMODULE_ZONE, ISC_LOG_DEBUG(3), + "removing journal file"); + (void)remove(zone->journal); + } + } + + dns_db_closeversion(db, &ver, ISC_FALSE); + + isc_log_write(dns_lctx, DNS_LOGCATEGORY_GENERAL, + DNS_LOGMODULE_ZONE, ISC_LOG_DEBUG(3), + "replacing zone database"); + + if (zone->db != NULL) + zone_detachdb(zone); + zone_attachdb(zone, db); + dns_db_settask(zone->db, zone->task); + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_LOADED|DNS_ZONEFLG_NEEDNOTIFY); + return (ISC_R_SUCCESS); + + fail: + dns_db_closeversion(db, &ver, ISC_FALSE); + return (result); +} + +/* The caller must hold the dblock as a writer. */ +static inline void +zone_attachdb(dns_zone_t *zone, dns_db_t *db) { + REQUIRE(zone->db == NULL && db != NULL); + + dns_db_attach(db, &zone->db); + if (zone->acache != NULL) { + isc_result_t result; + result = dns_acache_setdb(zone->acache, db); + if (result != ISC_R_SUCCESS && result != ISC_R_EXISTS) { + UNEXPECTED_ERROR(__FILE__, __LINE__, + "dns_acache_setdb() failed: %s", + isc_result_totext(result)); + } + } +} + +/* The caller must hold the dblock as a writer. */ +static inline void +zone_detachdb(dns_zone_t *zone) { + REQUIRE(zone->db != NULL); + + if (zone->acache != NULL) + (void)dns_acache_putdb(zone->acache, zone->db); + dns_db_detach(&zone->db); +} + +static void +zone_xfrdone(dns_zone_t *zone, isc_result_t result) { + isc_time_t now; + isc_boolean_t again = ISC_FALSE; + unsigned int soacount; + unsigned int nscount; + isc_uint32_t serial, refresh, retry, expire, minimum; + isc_result_t xfrresult = result; + isc_boolean_t free_needed; + + REQUIRE(DNS_ZONE_VALID(zone)); + + dns_zone_log(zone, ISC_LOG_DEBUG(1), + "zone transfer finished: %s", dns_result_totext(result)); + + LOCK_ZONE(zone); + INSIST((zone->flags & DNS_ZONEFLG_REFRESH) != 0); + DNS_ZONE_CLRFLAG(zone, DNS_ZONEFLG_REFRESH); + DNS_ZONE_CLRFLAG(zone, DNS_ZONEFLG_SOABEFOREAXFR); + + TIME_NOW(&now); + switch (result) { + case ISC_R_SUCCESS: + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_NEEDNOTIFY); + /*FALLTHROUGH*/ + case DNS_R_UPTODATE: + DNS_ZONE_CLRFLAG(zone, DNS_ZONEFLG_FORCEXFER); + /* + * Has the zone expired underneath us? + */ + ZONEDB_LOCK(&zone->dblock, isc_rwlocktype_read); + if (zone->db == NULL) { + ZONEDB_UNLOCK(&zone->dblock, isc_rwlocktype_read); + goto same_master; + } + + /* + * Update the zone structure's data from the actual + * SOA received. + */ + nscount = 0; + soacount = 0; + INSIST(zone->db != NULL); + result = zone_get_from_db(zone, zone->db, &nscount, + &soacount, &serial, &refresh, + &retry, &expire, &minimum, NULL); + ZONEDB_UNLOCK(&zone->dblock, isc_rwlocktype_read); + if (result == ISC_R_SUCCESS) { + if (soacount != 1) + dns_zone_log(zone, ISC_LOG_ERROR, + "transferred zone " + "has %d SOA record%s", soacount, + (soacount != 0) ? "s" : ""); + if (nscount == 0) { + dns_zone_log(zone, ISC_LOG_ERROR, + "transferred zone " + "has no NS records"); + if (DNS_ZONE_FLAG(zone, + DNS_ZONEFLG_HAVETIMERS)) { + zone->refresh = DNS_ZONE_DEFAULTREFRESH; + zone->retry = DNS_ZONE_DEFAULTRETRY; + } + DNS_ZONE_CLRFLAG(zone, DNS_ZONEFLG_HAVETIMERS); + zone_unload(zone); + goto next_master; + } + zone->serial = serial; + zone->refresh = RANGE(refresh, zone->minrefresh, + zone->maxrefresh); + zone->retry = RANGE(retry, zone->minretry, + zone->maxretry); + zone->expire = RANGE(expire, + zone->refresh + zone->retry, + DNS_MAX_EXPIRE); + zone->minimum = minimum; + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_HAVETIMERS); + } + + /* + * Set our next update/expire times. + */ + if (DNS_ZONE_FLAG(zone, DNS_ZONEFLG_NEEDREFRESH)) { + DNS_ZONE_CLRFLAG(zone, DNS_ZONEFLG_NEEDREFRESH); + zone->refreshtime = now; + DNS_ZONE_TIME_ADD(&now, zone->expire, + &zone->expiretime); + } else { + DNS_ZONE_JITTER_ADD(&now, zone->refresh, + &zone->refreshtime); + DNS_ZONE_TIME_ADD(&now, zone->expire, + &zone->expiretime); + } + if (result == ISC_R_SUCCESS && xfrresult == ISC_R_SUCCESS) { + char buf[DNS_NAME_FORMATSIZE + sizeof(": TSIG ''")]; + if (zone->tsigkey != NULL) { + char namebuf[DNS_NAME_FORMATSIZE]; + dns_name_format(&zone->tsigkey->name, namebuf, + sizeof(namebuf)); + snprintf(buf, sizeof(buf), ": TSIG '%s'", + namebuf); + } else + buf[0] = '\0'; + dns_zone_log(zone, ISC_LOG_INFO, + "transferred serial %u%s", + zone->serial, buf); + } + + /* + * This is not neccessary if we just performed a AXFR + * however it is necessary for an IXFR / UPTODATE and + * won't hurt with an AXFR. + */ + if (zone->masterfile != NULL || zone->journal != NULL) { + result = ISC_R_FAILURE; + if (zone->journal != NULL) + result = isc_file_settime(zone->journal, &now); + if (result != ISC_R_SUCCESS && + zone->masterfile != NULL) + result = isc_file_settime(zone->masterfile, + &now); + /* Someone removed the file from underneath us! */ + if (result == ISC_R_FILENOTFOUND && + zone->masterfile != NULL) + zone_needdump(zone, DNS_DUMP_DELAY); + else if (result != ISC_R_SUCCESS) + dns_zone_log(zone, ISC_LOG_ERROR, + "transfer: could not set file " + "modification time of '%s': %s", + zone->masterfile, + dns_result_totext(result)); + } + + break; + + case DNS_R_BADIXFR: + /* Force retry with AXFR. */ + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLAG_NOIXFR); + goto same_master; + + default: + next_master: + /* + * Skip to next failed / untried master. + */ + do { + zone->curmaster++; + } while (zone->curmaster < zone->masterscnt && + zone->mastersok[zone->curmaster]); + /* FALLTHROUGH */ + same_master: + if (zone->curmaster >= zone->masterscnt) { + zone->curmaster = 0; + if (DNS_ZONE_OPTION(zone, DNS_ZONEOPT_USEALTXFRSRC) && + !DNS_ZONE_FLAG(zone, DNS_ZONEFLG_USEALTXFRSRC)) { + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_REFRESH); + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_USEALTXFRSRC); + while (zone->curmaster < zone->masterscnt && + zone->mastersok[zone->curmaster]) + zone->curmaster++; + again = ISC_TRUE; + } else + DNS_ZONE_CLRFLAG(zone, DNS_ZONEFLG_USEALTXFRSRC); + } else { + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_REFRESH); + again = ISC_TRUE; + } + break; + } + zone_settimer(zone, &now); + + /* + * If creating the transfer object failed, zone->xfr is NULL. + * Otherwise, we are called as the done callback of a zone + * transfer object that just entered its shutting-down + * state. Since we are no longer responsible for shutting + * it down, we can detach our reference. + */ + if (zone->xfr != NULL) + dns_xfrin_detach(&zone->xfr); + + if (zone->tsigkey != NULL) + dns_tsigkey_detach(&zone->tsigkey); + + /* + * Handle any deferred journal compaction. + */ + if (DNS_ZONE_FLAG(zone, DNS_ZONEFLG_NEEDCOMPACT)) { + result = dns_journal_compact(zone->mctx, zone->journal, + zone->compact_serial, + zone->journalsize); + switch (result) { + case ISC_R_SUCCESS: + case ISC_R_NOSPACE: + case ISC_R_NOTFOUND: + dns_zone_log(zone, ISC_LOG_DEBUG(3), + "dns_journal_compact: %s", + dns_result_totext(result)); + break; + default: + dns_zone_log(zone, ISC_LOG_ERROR, + "dns_journal_compact failed: %s", + dns_result_totext(result)); + break; + } + DNS_ZONE_CLRFLAG(zone, DNS_ZONEFLG_NEEDCOMPACT); + } + + /* + * This transfer finishing freed up a transfer quota slot. + * Let any other zones waiting for quota have it. + */ + RWLOCK(&zone->zmgr->rwlock, isc_rwlocktype_write); + ISC_LIST_UNLINK(zone->zmgr->xfrin_in_progress, zone, statelink); + zone->statelist = NULL; + zmgr_resume_xfrs(zone->zmgr, ISC_FALSE); + RWUNLOCK(&zone->zmgr->rwlock, isc_rwlocktype_write); + + /* + * Retry with a different server if necessary. + */ + if (again && !DNS_ZONE_FLAG(zone, DNS_ZONEFLG_EXITING)) + queue_soa_query(zone); + + INSIST(zone->irefs > 0); + zone->irefs--; + free_needed = exit_check(zone); + UNLOCK_ZONE(zone); + if (free_needed) + zone_free(zone); +} + +static void +zone_loaddone(void *arg, isc_result_t result) { + static char me[] = "zone_loaddone"; + dns_load_t *load = arg; + dns_zone_t *zone; + isc_result_t tresult; + + REQUIRE(DNS_LOAD_VALID(load)); + zone = load->zone; + + ENTER; + + tresult = dns_db_endload(load->db, &load->callbacks.add_private); + if (tresult != ISC_R_SUCCESS && + (result == ISC_R_SUCCESS || result == DNS_R_SEENINCLUDE)) + result = tresult; + + LOCK_ZONE(load->zone); + (void)zone_postload(load->zone, load->db, load->loadtime, result); + zonemgr_putio(&load->zone->readio); + DNS_ZONE_CLRFLAG(load->zone, DNS_ZONEFLG_LOADING); + UNLOCK_ZONE(load->zone); + + load->magic = 0; + dns_db_detach(&load->db); + if (load->zone->lctx != NULL) + dns_loadctx_detach(&load->zone->lctx); + dns_zone_idetach(&load->zone); + isc_mem_putanddetach(&load->mctx, load, sizeof(*load)); +} + +void +dns_zone_getssutable(dns_zone_t *zone, dns_ssutable_t **table) { + REQUIRE(DNS_ZONE_VALID(zone)); + REQUIRE(table != NULL); + REQUIRE(*table == NULL); + + LOCK_ZONE(zone); + if (zone->ssutable != NULL) + dns_ssutable_attach(zone->ssutable, table); + UNLOCK_ZONE(zone); +} + +void +dns_zone_setssutable(dns_zone_t *zone, dns_ssutable_t *table) { + REQUIRE(DNS_ZONE_VALID(zone)); + + LOCK_ZONE(zone); + if (zone->ssutable != NULL) + dns_ssutable_detach(&zone->ssutable); + if (table != NULL) + dns_ssutable_attach(table, &zone->ssutable); + UNLOCK_ZONE(zone); +} + +void +dns_zone_setsigvalidityinterval(dns_zone_t *zone, isc_uint32_t interval) { + REQUIRE(DNS_ZONE_VALID(zone)); + + zone->sigvalidityinterval = interval; +} + +isc_uint32_t +dns_zone_getsigvalidityinterval(dns_zone_t *zone) { + REQUIRE(DNS_ZONE_VALID(zone)); + + return (zone->sigvalidityinterval); +} + +static void +queue_xfrin(dns_zone_t *zone) { + const char me[] = "queue_xfrin"; + isc_result_t result; + dns_zonemgr_t *zmgr = zone->zmgr; + + ENTER; + + INSIST(zone->statelist == NULL); + + RWLOCK(&zmgr->rwlock, isc_rwlocktype_write); + ISC_LIST_APPEND(zmgr->waiting_for_xfrin, zone, statelink); + LOCK_ZONE(zone); + zone->irefs++; + UNLOCK_ZONE(zone); + zone->statelist = &zmgr->waiting_for_xfrin; + result = zmgr_start_xfrin_ifquota(zmgr, zone); + RWUNLOCK(&zmgr->rwlock, isc_rwlocktype_write); + + if (result == ISC_R_QUOTA) { + dns_zone_logc(zone, DNS_LOGCATEGORY_XFER_IN, ISC_LOG_INFO, + "zone transfer deferred due to quota"); + } else if (result != ISC_R_SUCCESS) { + dns_zone_logc(zone, DNS_LOGCATEGORY_XFER_IN, ISC_LOG_ERROR, + "starting zone transfer: %s", + isc_result_totext(result)); + } +} + +/* + * This event callback is called when a zone has received + * any necessary zone transfer quota. This is the time + * to go ahead and start the transfer. + */ +static void +got_transfer_quota(isc_task_t *task, isc_event_t *event) { + isc_result_t result; + dns_peer_t *peer = NULL; + char mastertext[256]; + dns_rdatatype_t xfrtype; + dns_zone_t *zone = event->ev_arg; + isc_netaddr_t masterip; + isc_sockaddr_t sourceaddr; + isc_sockaddr_t masteraddr; + + UNUSED(task); + + INSIST(task == zone->task); + + if (DNS_ZONE_FLAG(zone, DNS_ZONEFLG_EXITING)) { + result = ISC_R_CANCELED; + goto cleanup; + } + + isc_sockaddr_format(&zone->masteraddr, mastertext, sizeof(mastertext)); + + isc_netaddr_fromsockaddr(&masterip, &zone->masteraddr); + (void)dns_peerlist_peerbyaddr(zone->view->peers, + &masterip, &peer); + + /* + * Decide whether we should request IXFR or AXFR. + */ + if (zone->db == NULL) { + dns_zone_log(zone, ISC_LOG_DEBUG(1), + "no database exists yet, " + "requesting AXFR of " + "initial version from %s", mastertext); + xfrtype = dns_rdatatype_axfr; + } else if (DNS_ZONE_OPTION(zone, DNS_ZONEOPT_IXFRFROMDIFFS)) { + dns_zone_log(zone, ISC_LOG_DEBUG(1), "ixfr-from-differences " + "set, requesting AXFR from %s", mastertext); + xfrtype = dns_rdatatype_axfr; + } else if (DNS_ZONE_FLAG(zone, DNS_ZONEFLG_FORCEXFER)) { + dns_zone_log(zone, ISC_LOG_DEBUG(1), + "forced reload, requesting AXFR of " + "initial version from %s", mastertext); + xfrtype = dns_rdatatype_axfr; + } else if (DNS_ZONE_FLAG(zone, DNS_ZONEFLAG_NOIXFR)) { + dns_zone_log(zone, ISC_LOG_DEBUG(1), + "retrying with AXFR from %s due to " + "previous IXFR failure", mastertext); + xfrtype = dns_rdatatype_axfr; + LOCK_ZONE(zone); + DNS_ZONE_CLRFLAG(zone, DNS_ZONEFLAG_NOIXFR); + UNLOCK_ZONE(zone); + } else { + isc_boolean_t use_ixfr = ISC_TRUE; + if (peer != NULL && + dns_peer_getrequestixfr(peer, &use_ixfr) == + ISC_R_SUCCESS) { + ; /* Using peer setting */ + } else { + use_ixfr = zone->view->requestixfr; + } + if (use_ixfr == ISC_FALSE) { + dns_zone_log(zone, ISC_LOG_DEBUG(1), + "IXFR disabled, " + "requesting AXFR from %s", + mastertext); + if (DNS_ZONE_FLAG(zone, DNS_ZONEFLG_SOABEFOREAXFR)) + xfrtype = dns_rdatatype_soa; + else + xfrtype = dns_rdatatype_axfr; + } else { + dns_zone_log(zone, ISC_LOG_DEBUG(1), + "requesting IXFR from %s", + mastertext); + xfrtype = dns_rdatatype_ixfr; + } + } + + /* + * Determine if we should attempt to sign the request with TSIG. + */ + result = ISC_R_NOTFOUND; + /* + * First, look for a tsig key in the master statement, then + * try for a server key. + */ + if ((zone->masterkeynames != NULL) && + (zone->masterkeynames[zone->curmaster] != NULL)) { + dns_view_t *view = dns_zone_getview(zone); + dns_name_t *keyname = zone->masterkeynames[zone->curmaster]; + result = dns_view_gettsig(view, keyname, &zone->tsigkey); + } + if (zone->tsigkey == NULL) + result = dns_view_getpeertsig(zone->view, &masterip, + &zone->tsigkey); + + if (result != ISC_R_SUCCESS && result != ISC_R_NOTFOUND) { + dns_zone_log(zone, ISC_LOG_ERROR, + "could not get TSIG key " + "for zone transfer: %s", + isc_result_totext(result)); + } + + LOCK_ZONE(zone); + masteraddr = zone->masteraddr; + sourceaddr = zone->sourceaddr; + UNLOCK_ZONE(zone); + INSIST(isc_sockaddr_pf(&masteraddr) == isc_sockaddr_pf(&sourceaddr)); + result = dns_xfrin_create2(zone, xfrtype, &masteraddr, &sourceaddr, + zone->tsigkey, zone->mctx, + zone->zmgr->timermgr, zone->zmgr->socketmgr, + zone->task, zone_xfrdone, &zone->xfr); + cleanup: + /* + * Any failure in this function is handled like a failed + * zone transfer. This ensures that we get removed from + * zmgr->xfrin_in_progress. + */ + if (result != ISC_R_SUCCESS) + zone_xfrdone(zone, result); + + isc_event_free(&event); +} + +/* + * Update forwarding support. + */ + +static void +forward_destroy(dns_forward_t *forward) { + + forward->magic = 0; + if (forward->request != NULL) + dns_request_destroy(&forward->request); + if (forward->msgbuf != NULL) + isc_buffer_free(&forward->msgbuf); + if (forward->zone != NULL) + dns_zone_idetach(&forward->zone); + isc_mem_putanddetach(&forward->mctx, forward, sizeof(*forward)); +} + +static isc_result_t +sendtomaster(dns_forward_t *forward) { + isc_result_t result; + isc_sockaddr_t src; + + LOCK_ZONE(forward->zone); + if (forward->which >= forward->zone->masterscnt) { + UNLOCK_ZONE(forward->zone); + return (ISC_R_NOMORE); + } + + forward->addr = forward->zone->masters[forward->which]; + /* + * Always use TCP regardless of whether the original update + * used TCP. + * XXX The timeout may but a bit small if we are far down a + * transfer graph and the master has to try several masters. + */ + switch (isc_sockaddr_pf(&forward->addr)) { + case PF_INET: + src = forward->zone->xfrsource4; + break; + case PF_INET6: + src = forward->zone->xfrsource6; + break; + default: + result = ISC_R_NOTIMPLEMENTED; + goto unlock; + } + result = dns_request_createraw(forward->zone->view->requestmgr, + forward->msgbuf, + &src, &forward->addr, + DNS_REQUESTOPT_TCP, 15 /* XXX */, + forward->zone->task, + forward_callback, forward, + &forward->request); + unlock: + UNLOCK_ZONE(forward->zone); + return (result); +} + +static void +forward_callback(isc_task_t *task, isc_event_t *event) { + const char me[] = "forward_callback"; + dns_requestevent_t *revent = (dns_requestevent_t *)event; + dns_message_t *msg = NULL; + char master[ISC_SOCKADDR_FORMATSIZE]; + isc_result_t result; + dns_forward_t *forward; + dns_zone_t *zone; + + UNUSED(task); + + forward = revent->ev_arg; + INSIST(DNS_FORWARD_VALID(forward)); + zone = forward->zone; + INSIST(DNS_ZONE_VALID(zone)); + + ENTER; + + isc_sockaddr_format(&forward->addr, master, sizeof(master)); + + if (revent->result != ISC_R_SUCCESS) { + dns_zone_log(zone, ISC_LOG_INFO, + "could not forward dynamic update to %s: %s", + master, dns_result_totext(revent->result)); + goto next_master; + } + + result = dns_message_create(zone->mctx, DNS_MESSAGE_INTENTPARSE, &msg); + if (result != ISC_R_SUCCESS) + goto next_master; + + result = dns_request_getresponse(revent->request, msg, + DNS_MESSAGEPARSE_PRESERVEORDER | + DNS_MESSAGEPARSE_CLONEBUFFER); + if (result != ISC_R_SUCCESS) + goto next_master; + + switch (msg->rcode) { + /* + * Pass these rcodes back to client. + */ + case dns_rcode_noerror: + case dns_rcode_yxdomain: + case dns_rcode_yxrrset: + case dns_rcode_nxrrset: + case dns_rcode_refused: + case dns_rcode_nxdomain: + break; + + /* These should not occur if the masters/zone are valid. */ + case dns_rcode_notzone: + case dns_rcode_notauth: { + char rcode[128]; + isc_buffer_t rb; + + isc_buffer_init(&rb, rcode, sizeof(rcode)); + (void)dns_rcode_totext(msg->rcode, &rb); + dns_zone_log(zone, ISC_LOG_WARNING, + "forwarding dynamic update: " + "unexpected response: master %s returned: %.*s", + master, (int)rb.used, rcode); + goto next_master; + } + + /* Try another server for these rcodes. */ + case dns_rcode_formerr: + case dns_rcode_servfail: + case dns_rcode_notimp: + case dns_rcode_badvers: + default: + goto next_master; + } + + /* call callback */ + (forward->callback)(forward->callback_arg, ISC_R_SUCCESS, msg); + msg = NULL; + dns_request_destroy(&forward->request); + forward_destroy(forward); + isc_event_free(&event); + return; + + next_master: + if (msg != NULL) + dns_message_destroy(&msg); + isc_event_free(&event); + forward->which++; + dns_request_destroy(&forward->request); + result = sendtomaster(forward); + if (result != ISC_R_SUCCESS) { + /* call callback */ + dns_zone_log(zone, ISC_LOG_DEBUG(3), + "exhausted dynamic update forwarder list"); + (forward->callback)(forward->callback_arg, result, NULL); + forward_destroy(forward); + } +} + +isc_result_t +dns_zone_forwardupdate(dns_zone_t *zone, dns_message_t *msg, + dns_updatecallback_t callback, void *callback_arg) +{ + dns_forward_t *forward; + isc_result_t result; + isc_region_t *mr; + + REQUIRE(DNS_ZONE_VALID(zone)); + REQUIRE(msg != NULL); + REQUIRE(callback != NULL); + + forward = isc_mem_get(zone->mctx, sizeof(*forward)); + if (forward == NULL) + return (ISC_R_NOMEMORY); + + forward->request = NULL; + forward->zone = NULL; + forward->msgbuf = NULL; + forward->which = 0; + forward->mctx = 0; + forward->callback = callback; + forward->callback_arg = callback_arg; + forward->magic = FORWARD_MAGIC; + + mr = dns_message_getrawmessage(msg); + if (mr == NULL) { + result = ISC_R_UNEXPECTEDEND; + goto cleanup; + } + + result = isc_buffer_allocate(zone->mctx, &forward->msgbuf, mr->length); + if (result != ISC_R_SUCCESS) + goto cleanup; + result = isc_buffer_copyregion(forward->msgbuf, mr); + if (result != ISC_R_SUCCESS) + goto cleanup; + + isc_mem_attach(zone->mctx, &forward->mctx); + dns_zone_iattach(zone, &forward->zone); + result = sendtomaster(forward); + + cleanup: + if (result != ISC_R_SUCCESS) { + forward_destroy(forward); + } + return (result); +} + +isc_result_t +dns_zone_next(dns_zone_t *zone, dns_zone_t **next) { + REQUIRE(DNS_ZONE_VALID(zone)); + REQUIRE(next != NULL && *next == NULL); + + *next = ISC_LIST_NEXT(zone, link); + if (*next == NULL) + return (ISC_R_NOMORE); + else + return (ISC_R_SUCCESS); +} + +isc_result_t +dns_zone_first(dns_zonemgr_t *zmgr, dns_zone_t **first) { + REQUIRE(DNS_ZONEMGR_VALID(zmgr)); + REQUIRE(first != NULL && *first == NULL); + + *first = ISC_LIST_HEAD(zmgr->zones); + if (*first == NULL) + return (ISC_R_NOMORE); + else + return (ISC_R_SUCCESS); +} + +/*** + *** Zone manager. + ***/ + +isc_result_t +dns_zonemgr_create(isc_mem_t *mctx, isc_taskmgr_t *taskmgr, + isc_timermgr_t *timermgr, isc_socketmgr_t *socketmgr, + dns_zonemgr_t **zmgrp) +{ + dns_zonemgr_t *zmgr; + isc_result_t result; + isc_interval_t interval; + + zmgr = isc_mem_get(mctx, sizeof(*zmgr)); + if (zmgr == NULL) + return (ISC_R_NOMEMORY); + zmgr->mctx = NULL; + zmgr->refs = 1; + isc_mem_attach(mctx, &zmgr->mctx); + zmgr->taskmgr = taskmgr; + zmgr->timermgr = timermgr; + zmgr->socketmgr = socketmgr; + zmgr->zonetasks = NULL; + zmgr->task = NULL; + zmgr->rl = NULL; + ISC_LIST_INIT(zmgr->zones); + ISC_LIST_INIT(zmgr->waiting_for_xfrin); + ISC_LIST_INIT(zmgr->xfrin_in_progress); + result = isc_rwlock_init(&zmgr->rwlock, 0, 0); + if (result != ISC_R_SUCCESS) + goto free_mem; + + zmgr->transfersin = 10; + zmgr->transfersperns = 2; + + /* Create the zone task pool. */ + result = isc_taskpool_create(taskmgr, mctx, + 8 /* XXX */, 2, &zmgr->zonetasks); + if (result != ISC_R_SUCCESS) + goto free_rwlock; + + /* Create a single task for queueing of SOA queries. */ + result = isc_task_create(taskmgr, 1, &zmgr->task); + if (result != ISC_R_SUCCESS) + goto free_taskpool; + isc_task_setname(zmgr->task, "zmgr", zmgr); + result = isc_ratelimiter_create(mctx, timermgr, zmgr->task, + &zmgr->rl); + if (result != ISC_R_SUCCESS) + goto free_task; + /* default to 20 refresh queries / notifies per second. */ + isc_interval_set(&interval, 0, 1000000000/2); + result = isc_ratelimiter_setinterval(zmgr->rl, &interval); + RUNTIME_CHECK(result == ISC_R_SUCCESS); + isc_ratelimiter_setpertic(zmgr->rl, 10); + + zmgr->iolimit = 1; + zmgr->ioactive = 0; + ISC_LIST_INIT(zmgr->high); + ISC_LIST_INIT(zmgr->low); + + result = isc_mutex_init(&zmgr->iolock); + if (result != ISC_R_SUCCESS) + goto free_rl; + + zmgr->magic = ZONEMGR_MAGIC; + + *zmgrp = zmgr; + return (ISC_R_SUCCESS); + +#if 0 + free_iolock: + DESTROYLOCK(&zmgr->iolock); +#endif + free_rl: + isc_ratelimiter_detach(&zmgr->rl); + free_task: + isc_task_detach(&zmgr->task); + free_taskpool: + isc_taskpool_destroy(&zmgr->zonetasks); + free_rwlock: + isc_rwlock_destroy(&zmgr->rwlock); + free_mem: + isc_mem_put(zmgr->mctx, zmgr, sizeof(*zmgr)); + isc_mem_detach(&mctx); + return (result); +} + +isc_result_t +dns_zonemgr_managezone(dns_zonemgr_t *zmgr, dns_zone_t *zone) { + isc_result_t result; + + REQUIRE(DNS_ZONE_VALID(zone)); + REQUIRE(DNS_ZONEMGR_VALID(zmgr)); + + RWLOCK(&zmgr->rwlock, isc_rwlocktype_write); + LOCK_ZONE(zone); + REQUIRE(zone->task == NULL); + REQUIRE(zone->timer == NULL); + REQUIRE(zone->zmgr == NULL); + + isc_taskpool_gettask(zmgr->zonetasks, + dns_name_hash(dns_zone_getorigin(zone), + ISC_FALSE), + &zone->task); + + /* + * Set the task name. The tag will arbitrarily point to one + * of the zones sharing the task (in practice, the one + * to be managed last). + */ + isc_task_setname(zone->task, "zone", zone); + + result = isc_timer_create(zmgr->timermgr, isc_timertype_inactive, + NULL, NULL, + zone->task, zone_timer, zone, + &zone->timer); + if (result != ISC_R_SUCCESS) + goto cleanup_task; + /* + * The timer "holds" a iref. + */ + zone->irefs++; + INSIST(zone->irefs != 0); + + ISC_LIST_APPEND(zmgr->zones, zone, link); + zone->zmgr = zmgr; + zmgr->refs++; + + goto unlock; + + cleanup_task: + isc_task_detach(&zone->task); + + unlock: + UNLOCK_ZONE(zone); + RWUNLOCK(&zmgr->rwlock, isc_rwlocktype_write); + return (result); +} + +void +dns_zonemgr_releasezone(dns_zonemgr_t *zmgr, dns_zone_t *zone) { + isc_boolean_t free_now = ISC_FALSE; + + REQUIRE(DNS_ZONE_VALID(zone)); + REQUIRE(DNS_ZONEMGR_VALID(zmgr)); + REQUIRE(zone->zmgr == zmgr); + + RWLOCK(&zmgr->rwlock, isc_rwlocktype_write); + LOCK_ZONE(zone); + + ISC_LIST_UNLINK(zmgr->zones, zone, link); + zone->zmgr = NULL; + zmgr->refs--; + if (zmgr->refs == 0) + free_now = ISC_TRUE; + + UNLOCK_ZONE(zone); + RWUNLOCK(&zmgr->rwlock, isc_rwlocktype_write); + + if (free_now) + zonemgr_free(zmgr); + ENSURE(zone->zmgr == NULL); +} + +void +dns_zonemgr_attach(dns_zonemgr_t *source, dns_zonemgr_t **target) { + REQUIRE(DNS_ZONEMGR_VALID(source)); + REQUIRE(target != NULL && *target == NULL); + + RWLOCK(&source->rwlock, isc_rwlocktype_write); + REQUIRE(source->refs > 0); + source->refs++; + INSIST(source->refs > 0); + RWUNLOCK(&source->rwlock, isc_rwlocktype_write); + *target = source; +} + +void +dns_zonemgr_detach(dns_zonemgr_t **zmgrp) { + dns_zonemgr_t *zmgr; + isc_boolean_t free_now = ISC_FALSE; + + REQUIRE(zmgrp != NULL); + zmgr = *zmgrp; + REQUIRE(DNS_ZONEMGR_VALID(zmgr)); + + RWLOCK(&zmgr->rwlock, isc_rwlocktype_write); + zmgr->refs--; + if (zmgr->refs == 0) + free_now = ISC_TRUE; + RWUNLOCK(&zmgr->rwlock, isc_rwlocktype_write); + + if (free_now) + zonemgr_free(zmgr); +} + +isc_result_t +dns_zonemgr_forcemaint(dns_zonemgr_t *zmgr) { + dns_zone_t *p; + + REQUIRE(DNS_ZONEMGR_VALID(zmgr)); + + RWLOCK(&zmgr->rwlock, isc_rwlocktype_read); + for (p = ISC_LIST_HEAD(zmgr->zones); + p != NULL; + p = ISC_LIST_NEXT(p, link)) + { + dns_zone_maintenance(p); + } + RWUNLOCK(&zmgr->rwlock, isc_rwlocktype_read); + + /* + * Recent configuration changes may have increased the + * amount of available transfers quota. Make sure any + * transfers currently blocked on quota get started if + * possible. + */ + RWLOCK(&zmgr->rwlock, isc_rwlocktype_write); + zmgr_resume_xfrs(zmgr, ISC_TRUE); + RWUNLOCK(&zmgr->rwlock, isc_rwlocktype_write); + return (ISC_R_SUCCESS); +} + +void +dns_zonemgr_resumexfrs(dns_zonemgr_t *zmgr) { + + REQUIRE(DNS_ZONEMGR_VALID(zmgr)); + + RWLOCK(&zmgr->rwlock, isc_rwlocktype_write); + zmgr_resume_xfrs(zmgr, ISC_TRUE); + RWUNLOCK(&zmgr->rwlock, isc_rwlocktype_write); +} + +void +dns_zonemgr_shutdown(dns_zonemgr_t *zmgr) { + REQUIRE(DNS_ZONEMGR_VALID(zmgr)); + + isc_ratelimiter_shutdown(zmgr->rl); + + if (zmgr->task != NULL) + isc_task_destroy(&zmgr->task); + if (zmgr->zonetasks != NULL) + isc_taskpool_destroy(&zmgr->zonetasks); +} + +static void +zonemgr_free(dns_zonemgr_t *zmgr) { + isc_mem_t *mctx; + + INSIST(zmgr->refs == 0); + INSIST(ISC_LIST_EMPTY(zmgr->zones)); + + zmgr->magic = 0; + + DESTROYLOCK(&zmgr->iolock); + isc_ratelimiter_detach(&zmgr->rl); + + isc_rwlock_destroy(&zmgr->rwlock); + mctx = zmgr->mctx; + isc_mem_put(zmgr->mctx, zmgr, sizeof(*zmgr)); + isc_mem_detach(&mctx); +} + +void +dns_zonemgr_settransfersin(dns_zonemgr_t *zmgr, isc_uint32_t value) { + REQUIRE(DNS_ZONEMGR_VALID(zmgr)); + + zmgr->transfersin = value; +} + +isc_uint32_t +dns_zonemgr_getttransfersin(dns_zonemgr_t *zmgr) { + REQUIRE(DNS_ZONEMGR_VALID(zmgr)); + + return (zmgr->transfersin); +} + +void +dns_zonemgr_settransfersperns(dns_zonemgr_t *zmgr, isc_uint32_t value) { + REQUIRE(DNS_ZONEMGR_VALID(zmgr)); + + zmgr->transfersperns = value; +} + +isc_uint32_t +dns_zonemgr_getttransfersperns(dns_zonemgr_t *zmgr) { + REQUIRE(DNS_ZONEMGR_VALID(zmgr)); + + return (zmgr->transfersperns); +} + +/* + * Try to start a new incoming zone transfer to fill a quota + * slot that was just vacated. + * + * Requires: + * The zone manager is locked by the caller. + */ +static void +zmgr_resume_xfrs(dns_zonemgr_t *zmgr, isc_boolean_t multi) { + dns_zone_t *zone; + dns_zone_t *next; + + for (zone = ISC_LIST_HEAD(zmgr->waiting_for_xfrin); + zone != NULL; + zone = next) + { + isc_result_t result; + next = ISC_LIST_NEXT(zone, statelink); + result = zmgr_start_xfrin_ifquota(zmgr, zone); + if (result == ISC_R_SUCCESS) { + if (multi) + continue; + /* + * We successfully filled the slot. We're done. + */ + break; + } else if (result == ISC_R_QUOTA) { + /* + * Not enough quota. This is probably the per-server + * quota, because we usually get called when a unit of + * global quota has just been freed. Try the next + * zone, it may succeed if it uses another master. + */ + continue; + } else { + dns_zone_log(zone, ISC_LOG_DEBUG(1), + "starting zone transfer: %s", + isc_result_totext(result)); + break; + } + } +} + +/* + * Try to start an incoming zone transfer for 'zone', quota permitting. + * + * Requires: + * The zone manager is locked by the caller. + * + * Returns: + * ISC_R_SUCCESS There was enough quota and we attempted to + * start a transfer. zone_xfrdone() has been or will + * be called. + * ISC_R_QUOTA Not enough quota. + * Others Failure. + */ +static isc_result_t +zmgr_start_xfrin_ifquota(dns_zonemgr_t *zmgr, dns_zone_t *zone) { + dns_peer_t *peer = NULL; + isc_netaddr_t masterip; + isc_uint32_t nxfrsin, nxfrsperns; + dns_zone_t *x; + isc_uint32_t maxtransfersin, maxtransfersperns; + isc_event_t *e; + + /* + * Find any configured information about the server we'd + * like to transfer this zone from. + */ + isc_netaddr_fromsockaddr(&masterip, &zone->masteraddr); + (void)dns_peerlist_peerbyaddr(zone->view->peers, + &masterip, &peer); + + /* + * Determine the total maximum number of simultaneous + * transfers allowed, and the maximum for this specific + * master. + */ + maxtransfersin = zmgr->transfersin; + maxtransfersperns = zmgr->transfersperns; + if (peer != NULL) + (void)dns_peer_gettransfers(peer, &maxtransfersperns); + + /* + * Count the total number of transfers that are in progress, + * and the number of transfers in progress from this master. + * We linearly scan a list of all transfers; if this turns + * out to be too slow, we could hash on the master address. + */ + nxfrsin = nxfrsperns = 0; + for (x = ISC_LIST_HEAD(zmgr->xfrin_in_progress); + x != NULL; + x = ISC_LIST_NEXT(x, statelink)) + { + isc_netaddr_t xip; + isc_netaddr_fromsockaddr(&xip, &x->masteraddr); + nxfrsin++; + if (isc_netaddr_equal(&xip, &masterip)) + nxfrsperns++; + } + + /* Enforce quota. */ + if (nxfrsin >= maxtransfersin) + return (ISC_R_QUOTA); + + if (nxfrsperns >= maxtransfersperns) + return (ISC_R_QUOTA); + + /* + * We have sufficient quota. Move the zone to the "xfrin_in_progress" + * list and send it an event to let it start the actual transfer in the + * context of its own task. + */ + e = isc_event_allocate(zmgr->mctx, zmgr, + DNS_EVENT_ZONESTARTXFRIN, + got_transfer_quota, zone, + sizeof(isc_event_t)); + if (e == NULL) + return (ISC_R_NOMEMORY); + + LOCK_ZONE(zone); + INSIST(zone->statelist == &zmgr->waiting_for_xfrin); + ISC_LIST_UNLINK(zmgr->waiting_for_xfrin, zone, statelink); + ISC_LIST_APPEND(zmgr->xfrin_in_progress, zone, statelink); + zone->statelist = &zmgr->xfrin_in_progress; + isc_task_send(zone->task, &e); + dns_zone_log(zone, ISC_LOG_INFO, "Transfer started."); + UNLOCK_ZONE(zone); + + return (ISC_R_SUCCESS); +} + +void +dns_zonemgr_setiolimit(dns_zonemgr_t *zmgr, isc_uint32_t iolimit) { + + REQUIRE(DNS_ZONEMGR_VALID(zmgr)); + REQUIRE(iolimit > 0); + + zmgr->iolimit = iolimit; +} + +isc_uint32_t +dns_zonemgr_getiolimit(dns_zonemgr_t *zmgr) { + + REQUIRE(DNS_ZONEMGR_VALID(zmgr)); + + return (zmgr->iolimit); +} + +/* + * Get permission to request a file handle from the OS. + * An event will be sent to action when one is available. + * There are two queues available (high and low), the high + * queue will be serviced before the low one. + * + * zonemgr_putio() must be called after the event is delivered to + * 'action'. + */ + +static isc_result_t +zonemgr_getio(dns_zonemgr_t *zmgr, isc_boolean_t high, + isc_task_t *task, isc_taskaction_t action, void *arg, + dns_io_t **iop) +{ + dns_io_t *io; + isc_boolean_t queue; + + REQUIRE(DNS_ZONEMGR_VALID(zmgr)); + REQUIRE(iop != NULL && *iop == NULL); + + io = isc_mem_get(zmgr->mctx, sizeof(*io)); + if (io == NULL) + return (ISC_R_NOMEMORY); + io->event = isc_event_allocate(zmgr->mctx, task, DNS_EVENT_IOREADY, + action, arg, sizeof(*io->event)); + if (io->event == NULL) { + isc_mem_put(zmgr->mctx, io, sizeof(*io)); + return (ISC_R_NOMEMORY); + } + io->zmgr = zmgr; + io->high = high; + io->task = NULL; + isc_task_attach(task, &io->task); + ISC_LINK_INIT(io, link); + io->magic = IO_MAGIC; + + LOCK(&zmgr->iolock); + zmgr->ioactive++; + queue = ISC_TF(zmgr->ioactive > zmgr->iolimit); + if (queue) { + if (io->high) + ISC_LIST_APPEND(zmgr->high, io, link); + else + ISC_LIST_APPEND(zmgr->low, io, link); + } + UNLOCK(&zmgr->iolock); + *iop = io; + + if (!queue) { + isc_task_send(io->task, &io->event); + } + return (ISC_R_SUCCESS); +} + +static void +zonemgr_putio(dns_io_t **iop) { + dns_io_t *io; + dns_io_t *next; + dns_zonemgr_t *zmgr; + + REQUIRE(iop != NULL); + io = *iop; + REQUIRE(DNS_IO_VALID(io)); + + *iop = NULL; + + INSIST(!ISC_LINK_LINKED(io, link)); + INSIST(io->event == NULL); + + zmgr = io->zmgr; + isc_task_detach(&io->task); + io->magic = 0; + isc_mem_put(zmgr->mctx, io, sizeof(*io)); + + LOCK(&zmgr->iolock); + INSIST(zmgr->ioactive > 0); + zmgr->ioactive--; + next = HEAD(zmgr->high); + if (next == NULL) + next = HEAD(zmgr->low); + if (next != NULL) { + if (next->high) + ISC_LIST_UNLINK(zmgr->high, next, link); + else + ISC_LIST_UNLINK(zmgr->low, next, link); + INSIST(next->event != NULL); + } + UNLOCK(&zmgr->iolock); + if (next != NULL) + isc_task_send(next->task, &next->event); +} + +static void +zonemgr_cancelio(dns_io_t *io) { + isc_boolean_t send_event = ISC_FALSE; + + REQUIRE(DNS_IO_VALID(io)); + + /* + * If we are queued to be run then dequeue. + */ + LOCK(&io->zmgr->iolock); + if (ISC_LINK_LINKED(io, link)) { + if (io->high) + ISC_LIST_UNLINK(io->zmgr->high, io, link); + else + ISC_LIST_UNLINK(io->zmgr->low, io, link); + + send_event = ISC_TRUE; + INSIST(io->event != NULL); + } + UNLOCK(&io->zmgr->iolock); + if (send_event) { + io->event->ev_attributes |= ISC_EVENTATTR_CANCELED; + isc_task_send(io->task, &io->event); + } +} + +static void +zone_saveunique(dns_zone_t *zone, const char *path, const char *templat) { + char *buf; + int buflen; + isc_result_t result; + + buflen = strlen(path) + strlen(templat) + 2; + + buf = isc_mem_get(zone->mctx, buflen); + if (buf == NULL) + return; + + result = isc_file_template(path, templat, buf, buflen); + if (result != ISC_R_SUCCESS) + goto cleanup; + + result = isc_file_renameunique(path, buf); + if (result != ISC_R_SUCCESS) + goto cleanup; + + dns_zone_log(zone, ISC_LOG_INFO, "saved '%s' as '%s'", + path, buf); + + cleanup: + isc_mem_put(zone->mctx, buf, buflen); +} + +#if 0 +/* Hook for ondestroy notifcation from a database. */ + +static void +dns_zonemgr_dbdestroyed(isc_task_t *task, isc_event_t *event) { + dns_db_t *db = event->sender; + UNUSED(task); + + isc_event_free(&event); + + isc_log_write(dns_lctx, DNS_LOGCATEGORY_GENERAL, + DNS_LOGMODULE_ZONE, ISC_LOG_DEBUG(3), + "database (%p) destroyed", (void*) db); +} +#endif + +void +dns_zonemgr_setserialqueryrate(dns_zonemgr_t *zmgr, unsigned int value) { + isc_interval_t interval; + isc_uint32_t s, ns; + isc_uint32_t pertic; + isc_result_t result; + + REQUIRE(DNS_ZONEMGR_VALID(zmgr)); + + if (value == 0) + value = 1; + + if (value == 1) { + s = 1; + ns = 0; + pertic = 1; + } else if (value <= 10) { + s = 0; + ns = 1000000000 / value; + pertic = 1; + } else { + s = 0; + ns = (1000000000 / value) * 10; + pertic = 10; + } + + isc_interval_set(&interval, s, ns); + result = isc_ratelimiter_setinterval(zmgr->rl, &interval); + RUNTIME_CHECK(result == ISC_R_SUCCESS); + isc_ratelimiter_setpertic(zmgr->rl, pertic); + + zmgr->serialqueryrate = value; +} + +unsigned int +dns_zonemgr_getserialqueryrate(dns_zonemgr_t *zmgr) { + REQUIRE(DNS_ZONEMGR_VALID(zmgr)); + + return (zmgr->serialqueryrate); +} + +void +dns_zone_forcereload(dns_zone_t *zone) { + REQUIRE(DNS_ZONE_VALID(zone)); + + if (zone->type == dns_zone_master) + return; + + LOCK_ZONE(zone); + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_FORCEXFER); + UNLOCK_ZONE(zone); + dns_zone_refresh(zone); +} + +isc_boolean_t +dns_zone_isforced(dns_zone_t *zone) { + REQUIRE(DNS_ZONE_VALID(zone)); + + return (DNS_ZONE_FLAG(zone, DNS_ZONEFLG_FORCEXFER)); +} + +isc_result_t +dns_zone_setstatistics(dns_zone_t *zone, isc_boolean_t on) { + isc_result_t result = ISC_R_SUCCESS; + + LOCK_ZONE(zone); + if (on) { + if (zone->counters != NULL) + goto done; + result = dns_stats_alloccounters(zone->mctx, &zone->counters); + } else { + if (zone->counters == NULL) + goto done; + dns_stats_freecounters(zone->mctx, &zone->counters); + } + done: + UNLOCK_ZONE(zone); + return (result); +} + +isc_uint64_t * +dns_zone_getstatscounters(dns_zone_t *zone) { + return (zone->counters); +} + +void +dns_zone_dialup(dns_zone_t *zone) { + + REQUIRE(DNS_ZONE_VALID(zone)); + + zone_debuglog(zone, "dns_zone_dialup", 3, + "notify = %d, refresh = %d", + DNS_ZONE_FLAG(zone, DNS_ZONEFLG_DIALNOTIFY), + DNS_ZONE_FLAG(zone, DNS_ZONEFLG_DIALREFRESH)); + + if (DNS_ZONE_FLAG(zone, DNS_ZONEFLG_DIALNOTIFY)) + dns_zone_notify(zone); + if (zone->type != dns_zone_master && + DNS_ZONE_FLAG(zone, DNS_ZONEFLG_DIALREFRESH)) + dns_zone_refresh(zone); +} + +void +dns_zone_setdialup(dns_zone_t *zone, dns_dialuptype_t dialup) { + REQUIRE(DNS_ZONE_VALID(zone)); + + LOCK_ZONE(zone); + DNS_ZONE_CLRFLAG(zone, DNS_ZONEFLG_DIALNOTIFY | + DNS_ZONEFLG_DIALREFRESH | + DNS_ZONEFLG_NOREFRESH); + switch (dialup) { + case dns_dialuptype_no: + break; + case dns_dialuptype_yes: + DNS_ZONE_SETFLAG(zone, (DNS_ZONEFLG_DIALNOTIFY | + DNS_ZONEFLG_DIALREFRESH | + DNS_ZONEFLG_NOREFRESH)); + break; + case dns_dialuptype_notify: + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_DIALNOTIFY); + break; + case dns_dialuptype_notifypassive: + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_DIALNOTIFY); + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_NOREFRESH); + break; + case dns_dialuptype_refresh: + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_DIALREFRESH); + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_NOREFRESH); + break; + case dns_dialuptype_passive: + DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_NOREFRESH); + break; + default: + INSIST(0); + } + UNLOCK_ZONE(zone); +} + +isc_result_t +dns_zone_setkeydirectory(dns_zone_t *zone, const char *directory) { + isc_result_t result = ISC_R_SUCCESS; + + REQUIRE(DNS_ZONE_VALID(zone)); + + LOCK_ZONE(zone); + result = dns_zone_setstring(zone, &zone->keydirectory, directory); + UNLOCK_ZONE(zone); + + return (result); +} + +const char * +dns_zone_getkeydirectory(dns_zone_t *zone) { + REQUIRE(DNS_ZONE_VALID(zone)); + + return (zone->keydirectory); +} + +unsigned int +dns_zonemgr_getcount(dns_zonemgr_t *zmgr, int state) { + dns_zone_t *zone; + unsigned int count = 0; + + REQUIRE(DNS_ZONEMGR_VALID(zmgr)); + + RWLOCK(&zmgr->rwlock, isc_rwlocktype_read); + switch (state) { + case DNS_ZONESTATE_XFERRUNNING: + for (zone = ISC_LIST_HEAD(zmgr->xfrin_in_progress); + zone != NULL; + zone = ISC_LIST_NEXT(zone, statelink)) + count++; + break; + case DNS_ZONESTATE_XFERDEFERRED: + for (zone = ISC_LIST_HEAD(zmgr->waiting_for_xfrin); + zone != NULL; + zone = ISC_LIST_NEXT(zone, statelink)) + count++; + break; + case DNS_ZONESTATE_SOAQUERY: + for (zone = ISC_LIST_HEAD(zmgr->zones); + zone != NULL; + zone = ISC_LIST_NEXT(zone, link)) + if (DNS_ZONE_FLAG(zone, DNS_ZONEFLG_REFRESH)) + count++; + break; + case DNS_ZONESTATE_ANY: + for (zone = ISC_LIST_HEAD(zmgr->zones); + zone != NULL; + zone = ISC_LIST_NEXT(zone, link)) { + dns_view_t *view = zone->view; + if (view != NULL && strcmp(view->name, "_bind") == 0) + continue; + count++; + } + break; + default: + INSIST(0); + } + + RWUNLOCK(&zmgr->rwlock, isc_rwlocktype_read); + + return (count); +} + +isc_result_t +dns_zone_checknames(dns_zone_t *zone, dns_name_t *name, dns_rdata_t *rdata) { + isc_boolean_t ok = ISC_TRUE; + isc_boolean_t fail = ISC_FALSE; + char namebuf[DNS_NAME_FORMATSIZE]; + char namebuf2[DNS_NAME_FORMATSIZE]; + char typebuf[DNS_RDATATYPE_FORMATSIZE]; + int level = ISC_LOG_WARNING; + dns_name_t bad; + + REQUIRE(DNS_ZONE_VALID(zone)); + + if (!DNS_ZONE_OPTION(zone, DNS_ZONEOPT_CHECKNAMES)) + return (ISC_R_SUCCESS); + + if (DNS_ZONE_OPTION(zone, DNS_ZONEOPT_CHECKNAMESFAIL)) { + level = ISC_LOG_ERROR; + fail = ISC_TRUE; + } + + ok = dns_rdata_checkowner(name, rdata->rdclass, rdata->type, ISC_TRUE); + if (!ok) { + dns_name_format(name, namebuf, sizeof(namebuf)); + dns_rdatatype_format(rdata->type, typebuf, sizeof(typebuf)); + dns_zone_log(zone, level, "%s/%s: %s", namebuf, typebuf, + dns_result_totext(DNS_R_BADOWNERNAME)); + if (fail) + return (DNS_R_BADOWNERNAME); + } + + dns_name_init(&bad, NULL); + ok = dns_rdata_checknames(rdata, name, &bad); + if (!ok) { + dns_name_format(name, namebuf, sizeof(namebuf)); + dns_name_format(&bad, namebuf2, sizeof(namebuf2)); + dns_rdatatype_format(rdata->type, typebuf, sizeof(typebuf)); + dns_zone_log(zone, level, "%s/%s: %s: %s ", namebuf, typebuf, + namebuf2, dns_result_totext(DNS_R_BADNAME)); + if (fail) + return (DNS_R_BADNAME); + } + + return (ISC_R_SUCCESS); +} + +void +dns_zone_setcheckmx(dns_zone_t *zone, dns_checkmxfunc_t checkmx) { + REQUIRE(DNS_ZONE_VALID(zone)); + zone->checkmx = checkmx; +} + +void +dns_zone_setchecksrv(dns_zone_t *zone, dns_checksrvfunc_t checksrv) { + REQUIRE(DNS_ZONE_VALID(zone)); + zone->checksrv = checksrv; +} + +void +dns_zone_setcheckns(dns_zone_t *zone, dns_checknsfunc_t checkns) { + REQUIRE(DNS_ZONE_VALID(zone)); + zone->checkns = checkns; +} + +void +dns_zone_setisself(dns_zone_t *zone, dns_isselffunc_t isself, void *arg) { + REQUIRE(DNS_ZONE_VALID(zone)); + + LOCK_ZONE(zone); + zone->isself = isself; + zone->isselfarg = arg; + UNLOCK_ZONE(zone); +} + +void +dns_zone_setnotifydelay(dns_zone_t *zone, isc_uint32_t delay) { + REQUIRE(DNS_ZONE_VALID(zone)); + + LOCK_ZONE(zone); + zone->notifydelay = delay; + UNLOCK_ZONE(zone); +} + +isc_uint32_t +dns_zone_getnotifydelay(dns_zone_t *zone) { + REQUIRE(DNS_ZONE_VALID(zone)); + + return (zone->notifydelay); +} |
