diff options
Diffstat (limited to 'contrib/bind9/bin/named/update.c')
| -rw-r--r-- | contrib/bind9/bin/named/update.c | 3026 |
1 files changed, 0 insertions, 3026 deletions
diff --git a/contrib/bind9/bin/named/update.c b/contrib/bind9/bin/named/update.c deleted file mode 100644 index 98054f8..0000000 --- a/contrib/bind9/bin/named/update.c +++ /dev/null @@ -1,3026 +0,0 @@ -/* - * 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: update.c,v 1.109.18.23 2007/08/28 07:20:01 tbox Exp $ */ - -#include <config.h> - -#include <isc/print.h> -#include <isc/string.h> -#include <isc/taskpool.h> -#include <isc/util.h> - -#include <dns/db.h> -#include <dns/dbiterator.h> -#include <dns/diff.h> -#include <dns/dnssec.h> -#include <dns/events.h> -#include <dns/fixedname.h> -#include <dns/journal.h> -#include <dns/keyvalues.h> -#include <dns/message.h> -#include <dns/nsec.h> -#include <dns/rdataclass.h> -#include <dns/rdataset.h> -#include <dns/rdatasetiter.h> -#include <dns/rdatastruct.h> -#include <dns/rdatatype.h> -#include <dns/soa.h> -#include <dns/ssu.h> -#include <dns/view.h> -#include <dns/zone.h> -#include <dns/zt.h> - -#include <named/client.h> -#include <named/log.h> -#include <named/update.h> - -/*! \file - * \brief - * This module implements dynamic update as in RFC2136. - */ - -/* - XXX TODO: - - document strict minimality -*/ - -/**************************************************************************/ - -/*% - * Log level for tracing dynamic update protocol requests. - */ -#define LOGLEVEL_PROTOCOL ISC_LOG_INFO - -/*% - * Log level for low-level debug tracing. - */ -#define LOGLEVEL_DEBUG ISC_LOG_DEBUG(8) - -/*% - * Check an operation for failure. These macros all assume that - * the function using them has a 'result' variable and a 'failure' - * label. - */ -#define CHECK(op) \ - do { result = (op); \ - if (result != ISC_R_SUCCESS) goto failure; \ - } while (0) - -/*% - * Fail unconditionally with result 'code', which must not - * be ISC_R_SUCCESS. The reason for failure presumably has - * been logged already. - * - * The test against ISC_R_SUCCESS is there to keep the Solaris compiler - * from complaining about "end-of-loop code not reached". - */ - -#define FAIL(code) \ - do { \ - result = (code); \ - if (result != ISC_R_SUCCESS) goto failure; \ - } while (0) - -/*% - * Fail unconditionally and log as a client error. - * The test against ISC_R_SUCCESS is there to keep the Solaris compiler - * from complaining about "end-of-loop code not reached". - */ -#define FAILC(code, msg) \ - do { \ - const char *_what = "failed"; \ - result = (code); \ - switch (result) { \ - case DNS_R_NXDOMAIN: \ - case DNS_R_YXDOMAIN: \ - case DNS_R_YXRRSET: \ - case DNS_R_NXRRSET: \ - _what = "unsuccessful"; \ - } \ - update_log(client, zone, LOGLEVEL_PROTOCOL, \ - "update %s: %s (%s)", _what, \ - msg, isc_result_totext(result)); \ - if (result != ISC_R_SUCCESS) goto failure; \ - } while (0) - -#define FAILN(code, name, msg) \ - do { \ - const char *_what = "failed"; \ - result = (code); \ - switch (result) { \ - case DNS_R_NXDOMAIN: \ - case DNS_R_YXDOMAIN: \ - case DNS_R_YXRRSET: \ - case DNS_R_NXRRSET: \ - _what = "unsuccessful"; \ - } \ - if (isc_log_wouldlog(ns_g_lctx, LOGLEVEL_PROTOCOL)) { \ - char _nbuf[DNS_NAME_FORMATSIZE]; \ - dns_name_format(name, _nbuf, sizeof(_nbuf)); \ - update_log(client, zone, LOGLEVEL_PROTOCOL, \ - "update %s: %s: %s (%s)", _what, _nbuf, \ - msg, isc_result_totext(result)); \ - } \ - if (result != ISC_R_SUCCESS) goto failure; \ - } while (0) - -#define FAILNT(code, name, type, msg) \ - do { \ - const char *_what = "failed"; \ - result = (code); \ - switch (result) { \ - case DNS_R_NXDOMAIN: \ - case DNS_R_YXDOMAIN: \ - case DNS_R_YXRRSET: \ - case DNS_R_NXRRSET: \ - _what = "unsuccessful"; \ - } \ - if (isc_log_wouldlog(ns_g_lctx, LOGLEVEL_PROTOCOL)) { \ - char _nbuf[DNS_NAME_FORMATSIZE]; \ - char _tbuf[DNS_RDATATYPE_FORMATSIZE]; \ - dns_name_format(name, _nbuf, sizeof(_nbuf)); \ - dns_rdatatype_format(type, _tbuf, sizeof(_tbuf)); \ - update_log(client, zone, LOGLEVEL_PROTOCOL, \ - "update %s: %s/%s: %s (%s)", \ - _what, _nbuf, _tbuf, msg, \ - isc_result_totext(result)); \ - } \ - if (result != ISC_R_SUCCESS) goto failure; \ - } while (0) -/*% - * Fail unconditionally and log as a server error. - * The test against ISC_R_SUCCESS is there to keep the Solaris compiler - * from complaining about "end-of-loop code not reached". - */ -#define FAILS(code, msg) \ - do { \ - result = (code); \ - update_log(client, zone, LOGLEVEL_PROTOCOL, \ - "error: %s: %s", \ - msg, isc_result_totext(result)); \ - if (result != ISC_R_SUCCESS) goto failure; \ - } while (0) - -/**************************************************************************/ - -typedef struct rr rr_t; - -struct rr { - /* dns_name_t name; */ - isc_uint32_t ttl; - dns_rdata_t rdata; -}; - -typedef struct update_event update_event_t; - -struct update_event { - ISC_EVENT_COMMON(update_event_t); - dns_zone_t *zone; - isc_result_t result; - dns_message_t *answer; -}; - -/**************************************************************************/ -/* - * Forward declarations. - */ - -static void update_action(isc_task_t *task, isc_event_t *event); -static void updatedone_action(isc_task_t *task, isc_event_t *event); -static isc_result_t send_forward_event(ns_client_t *client, dns_zone_t *zone); -static void forward_done(isc_task_t *task, isc_event_t *event); - -/**************************************************************************/ - -static void -update_log(ns_client_t *client, dns_zone_t *zone, - int level, const char *fmt, ...) ISC_FORMAT_PRINTF(4, 5); - -static void -update_log(ns_client_t *client, dns_zone_t *zone, - int level, const char *fmt, ...) -{ - va_list ap; - char message[4096]; - char namebuf[DNS_NAME_FORMATSIZE]; - char classbuf[DNS_RDATACLASS_FORMATSIZE]; - - if (client == NULL || zone == NULL) - return; - - if (isc_log_wouldlog(ns_g_lctx, level) == ISC_FALSE) - return; - - dns_name_format(dns_zone_getorigin(zone), namebuf, - sizeof(namebuf)); - dns_rdataclass_format(dns_zone_getclass(zone), classbuf, - sizeof(classbuf)); - - va_start(ap, fmt); - vsnprintf(message, sizeof(message), fmt, ap); - va_end(ap); - - ns_client_log(client, NS_LOGCATEGORY_UPDATE, NS_LOGMODULE_UPDATE, - level, "updating zone '%s/%s': %s", - namebuf, classbuf, message); -} - -static isc_result_t -checkupdateacl(ns_client_t *client, dns_acl_t *acl, const char *message, - dns_name_t *zonename, isc_boolean_t slave) -{ - char namebuf[DNS_NAME_FORMATSIZE]; - char classbuf[DNS_RDATACLASS_FORMATSIZE]; - int level = ISC_LOG_ERROR; - const char *msg = "denied"; - isc_result_t result; - - if (slave && acl == NULL) { - result = DNS_R_NOTIMP; - level = ISC_LOG_DEBUG(3); - msg = "disabled"; - } else - result = ns_client_checkaclsilent(client, acl, ISC_FALSE); - - if (result == ISC_R_SUCCESS) { - level = ISC_LOG_DEBUG(3); - msg = "approved"; - } - - dns_name_format(zonename, namebuf, sizeof(namebuf)); - dns_rdataclass_format(client->view->rdclass, classbuf, - sizeof(classbuf)); - - ns_client_log(client, NS_LOGCATEGORY_UPDATE_SECURITY, - NS_LOGMODULE_UPDATE, level, "%s '%s/%s' %s", - message, namebuf, classbuf, msg); - return (result); -} - -/*% - * Update a single RR in version 'ver' of 'db' and log the - * update in 'diff'. - * - * Ensures: - * \li '*tuple' == NULL. Either the tuple is freed, or its - * ownership has been transferred to the diff. - */ -static isc_result_t -do_one_tuple(dns_difftuple_t **tuple, - dns_db_t *db, dns_dbversion_t *ver, - dns_diff_t *diff) -{ - dns_diff_t temp_diff; - isc_result_t result; - - /* - * Create a singleton diff. - */ - dns_diff_init(diff->mctx, &temp_diff); - ISC_LIST_APPEND(temp_diff.tuples, *tuple, link); - - /* - * Apply it to the database. - */ - result = dns_diff_apply(&temp_diff, db, ver); - ISC_LIST_UNLINK(temp_diff.tuples, *tuple, link); - if (result != ISC_R_SUCCESS) { - dns_difftuple_free(tuple); - return (result); - } - - /* - * Merge it into the current pending journal entry. - */ - dns_diff_appendminimal(diff, tuple); - - /* - * Do not clear temp_diff. - */ - return (ISC_R_SUCCESS); -} - -/*% - * Perform the updates in 'updates' in version 'ver' of 'db' and log the - * update in 'diff'. - * - * Ensures: - * \li 'updates' is empty. - */ -static isc_result_t -do_diff(dns_diff_t *updates, dns_db_t *db, dns_dbversion_t *ver, - dns_diff_t *diff) -{ - isc_result_t result; - while (! ISC_LIST_EMPTY(updates->tuples)) { - dns_difftuple_t *t = ISC_LIST_HEAD(updates->tuples); - ISC_LIST_UNLINK(updates->tuples, t, link); - CHECK(do_one_tuple(&t, db, ver, diff)); - } - return (ISC_R_SUCCESS); - - failure: - dns_diff_clear(diff); - return (result); -} - -static isc_result_t -update_one_rr(dns_db_t *db, dns_dbversion_t *ver, dns_diff_t *diff, - dns_diffop_t op, dns_name_t *name, - dns_ttl_t ttl, dns_rdata_t *rdata) -{ - dns_difftuple_t *tuple = NULL; - isc_result_t result; - result = dns_difftuple_create(diff->mctx, op, - name, ttl, rdata, &tuple); - if (result != ISC_R_SUCCESS) - return (result); - return (do_one_tuple(&tuple, db, ver, diff)); -} - -/**************************************************************************/ -/* - * Callback-style iteration over rdatasets and rdatas. - * - * foreach_rrset() can be used to iterate over the RRsets - * of a name and call a callback function with each - * one. Similarly, foreach_rr() can be used to iterate - * over the individual RRs at name, optionally restricted - * to RRs of a given type. - * - * The callback functions are called "actions" and take - * two arguments: a void pointer for passing arbitrary - * context information, and a pointer to the current RRset - * or RR. By convention, their names end in "_action". - */ - -/* - * XXXRTH We might want to make this public somewhere in libdns. - */ - -/*% - * Function type for foreach_rrset() iterator actions. - */ -typedef isc_result_t rrset_func(void *data, dns_rdataset_t *rrset); - -/*% - * Function type for foreach_rr() iterator actions. - */ -typedef isc_result_t rr_func(void *data, rr_t *rr); - -/*% - * Internal context struct for foreach_node_rr(). - */ -typedef struct { - rr_func * rr_action; - void * rr_action_data; -} foreach_node_rr_ctx_t; - -/*% - * Internal helper function for foreach_node_rr(). - */ -static isc_result_t -foreach_node_rr_action(void *data, dns_rdataset_t *rdataset) { - isc_result_t result; - foreach_node_rr_ctx_t *ctx = data; - for (result = dns_rdataset_first(rdataset); - result == ISC_R_SUCCESS; - result = dns_rdataset_next(rdataset)) - { - rr_t rr = { 0, DNS_RDATA_INIT }; - - dns_rdataset_current(rdataset, &rr.rdata); - rr.ttl = rdataset->ttl; - result = (*ctx->rr_action)(ctx->rr_action_data, &rr); - if (result != ISC_R_SUCCESS) - return (result); - } - if (result != ISC_R_NOMORE) - return (result); - return (ISC_R_SUCCESS); -} - -/*% - * For each rdataset of 'name' in 'ver' of 'db', call 'action' - * with the rdataset and 'action_data' as arguments. If the name - * does not exist, do nothing. - * - * If 'action' returns an error, abort iteration and return the error. - */ -static isc_result_t -foreach_rrset(dns_db_t *db, - dns_dbversion_t *ver, - dns_name_t *name, - rrset_func *action, - void *action_data) -{ - isc_result_t result; - dns_dbnode_t *node; - dns_rdatasetiter_t *iter; - - node = NULL; - result = dns_db_findnode(db, name, ISC_FALSE, &node); - if (result == ISC_R_NOTFOUND) - return (ISC_R_SUCCESS); - if (result != ISC_R_SUCCESS) - return (result); - - iter = NULL; - result = dns_db_allrdatasets(db, node, ver, - (isc_stdtime_t) 0, &iter); - if (result != ISC_R_SUCCESS) - goto cleanup_node; - - for (result = dns_rdatasetiter_first(iter); - result == ISC_R_SUCCESS; - result = dns_rdatasetiter_next(iter)) - { - dns_rdataset_t rdataset; - - dns_rdataset_init(&rdataset); - dns_rdatasetiter_current(iter, &rdataset); - - result = (*action)(action_data, &rdataset); - - dns_rdataset_disassociate(&rdataset); - if (result != ISC_R_SUCCESS) - goto cleanup_iterator; - } - if (result == ISC_R_NOMORE) - result = ISC_R_SUCCESS; - - cleanup_iterator: - dns_rdatasetiter_destroy(&iter); - - cleanup_node: - dns_db_detachnode(db, &node); - - return (result); -} - -/*% - * For each RR of 'name' in 'ver' of 'db', call 'action' - * with the RR and 'action_data' as arguments. If the name - * does not exist, do nothing. - * - * If 'action' returns an error, abort iteration - * and return the error. - */ -static isc_result_t -foreach_node_rr(dns_db_t *db, - dns_dbversion_t *ver, - dns_name_t *name, - rr_func *rr_action, - void *rr_action_data) -{ - foreach_node_rr_ctx_t ctx; - ctx.rr_action = rr_action; - ctx.rr_action_data = rr_action_data; - return (foreach_rrset(db, ver, name, - foreach_node_rr_action, &ctx)); -} - - -/*% - * For each of the RRs specified by 'db', 'ver', 'name', 'type', - * (which can be dns_rdatatype_any to match any type), and 'covers', call - * 'action' with the RR and 'action_data' as arguments. If the name - * does not exist, or if no RRset of the given type exists at the name, - * do nothing. - * - * If 'action' returns an error, abort iteration and return the error. - */ -static isc_result_t -foreach_rr(dns_db_t *db, - dns_dbversion_t *ver, - dns_name_t *name, - dns_rdatatype_t type, - dns_rdatatype_t covers, - rr_func *rr_action, - void *rr_action_data) -{ - - isc_result_t result; - dns_dbnode_t *node; - dns_rdataset_t rdataset; - - if (type == dns_rdatatype_any) - return (foreach_node_rr(db, ver, name, - rr_action, rr_action_data)); - - node = NULL; - result = dns_db_findnode(db, name, ISC_FALSE, &node); - if (result == ISC_R_NOTFOUND) - return (ISC_R_SUCCESS); - if (result != ISC_R_SUCCESS) - return (result); - - dns_rdataset_init(&rdataset); - result = dns_db_findrdataset(db, node, ver, type, covers, - (isc_stdtime_t) 0, &rdataset, NULL); - if (result == ISC_R_NOTFOUND) { - result = ISC_R_SUCCESS; - goto cleanup_node; - } - if (result != ISC_R_SUCCESS) - goto cleanup_node; - - for (result = dns_rdataset_first(&rdataset); - result == ISC_R_SUCCESS; - result = dns_rdataset_next(&rdataset)) - { - rr_t rr = { 0, DNS_RDATA_INIT }; - dns_rdataset_current(&rdataset, &rr.rdata); - rr.ttl = rdataset.ttl; - result = (*rr_action)(rr_action_data, &rr); - if (result != ISC_R_SUCCESS) - goto cleanup_rdataset; - } - if (result != ISC_R_NOMORE) - goto cleanup_rdataset; - result = ISC_R_SUCCESS; - - cleanup_rdataset: - dns_rdataset_disassociate(&rdataset); - cleanup_node: - dns_db_detachnode(db, &node); - - return (result); -} - -/**************************************************************************/ -/* - * Various tests on the database contents (for prerequisites, etc). - */ - -/*% - * Function type for predicate functions that compare a database RR 'db_rr' - * against an update RR 'update_rr'. - */ -typedef isc_boolean_t rr_predicate(dns_rdata_t *update_rr, dns_rdata_t *db_rr); - -/*% - * Helper function for rrset_exists(). - */ -static isc_result_t -rrset_exists_action(void *data, rr_t *rr) { - UNUSED(data); - UNUSED(rr); - return (ISC_R_EXISTS); -} - -/*% - * Utility macro for RR existence checking functions. - * - * If the variable 'result' has the value ISC_R_EXISTS or - * ISC_R_SUCCESS, set *exists to ISC_TRUE or ISC_FALSE, - * respectively, and return success. - * - * If 'result' has any other value, there was a failure. - * Return the failure result code and do not set *exists. - * - * This would be more readable as "do { if ... } while(0)", - * but that form generates tons of warnings on Solaris 2.6. - */ -#define RETURN_EXISTENCE_FLAG \ - return ((result == ISC_R_EXISTS) ? \ - (*exists = ISC_TRUE, ISC_R_SUCCESS) : \ - ((result == ISC_R_SUCCESS) ? \ - (*exists = ISC_FALSE, ISC_R_SUCCESS) : \ - result)) - -/*% - * Set '*exists' to true iff an rrset of the given type exists, - * to false otherwise. - */ -static isc_result_t -rrset_exists(dns_db_t *db, dns_dbversion_t *ver, - dns_name_t *name, dns_rdatatype_t type, dns_rdatatype_t covers, - isc_boolean_t *exists) -{ - isc_result_t result; - result = foreach_rr(db, ver, name, type, covers, - rrset_exists_action, NULL); - RETURN_EXISTENCE_FLAG; -} - -/*% - * Helper function for cname_incompatible_rrset_exists. - */ -static isc_result_t -cname_compatibility_action(void *data, dns_rdataset_t *rrset) { - UNUSED(data); - if (rrset->type != dns_rdatatype_cname && - ! dns_rdatatype_isdnssec(rrset->type)) - return (ISC_R_EXISTS); - return (ISC_R_SUCCESS); -} - -/*% - * Check whether there is an rrset incompatible with adding a CNAME RR, - * i.e., anything but another CNAME (which can be replaced) or a - * DNSSEC RR (which can coexist). - * - * If such an incompatible rrset exists, set '*exists' to ISC_TRUE. - * Otherwise, set it to ISC_FALSE. - */ -static isc_result_t -cname_incompatible_rrset_exists(dns_db_t *db, dns_dbversion_t *ver, - dns_name_t *name, isc_boolean_t *exists) { - isc_result_t result; - result = foreach_rrset(db, ver, name, - cname_compatibility_action, NULL); - RETURN_EXISTENCE_FLAG; -} - -/*% - * Helper function for rr_count(). - */ -static isc_result_t -count_rr_action(void *data, rr_t *rr) { - int *countp = data; - UNUSED(rr); - (*countp)++; - return (ISC_R_SUCCESS); -} - -/*% - * Count the number of RRs of 'type' belonging to 'name' in 'ver' of 'db'. - */ -static isc_result_t -rr_count(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, - dns_rdatatype_t type, dns_rdatatype_t covers, int *countp) -{ - *countp = 0; - return (foreach_rr(db, ver, name, type, covers, - count_rr_action, countp)); -} - -/*% - * Context struct and helper function for name_exists(). - */ - -static isc_result_t -name_exists_action(void *data, dns_rdataset_t *rrset) { - UNUSED(data); - UNUSED(rrset); - return (ISC_R_EXISTS); -} - -/*% - * Set '*exists' to true iff the given name exists, to false otherwise. - */ -static isc_result_t -name_exists(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, - isc_boolean_t *exists) -{ - isc_result_t result; - result = foreach_rrset(db, ver, name, - name_exists_action, NULL); - RETURN_EXISTENCE_FLAG; -} - -typedef struct { - dns_name_t *name, *signer; - dns_ssutable_t *table; -} ssu_check_t; - -static isc_result_t -ssu_checkrule(void *data, dns_rdataset_t *rrset) { - ssu_check_t *ssuinfo = data; - isc_boolean_t result; - - /* - * If we're deleting all records, it's ok to delete RRSIG and NSEC even - * if we're normally not allowed to. - */ - if (rrset->type == dns_rdatatype_rrsig || - rrset->type == dns_rdatatype_nsec) - return (ISC_R_SUCCESS); - result = dns_ssutable_checkrules(ssuinfo->table, ssuinfo->signer, - ssuinfo->name, rrset->type); - return (result == ISC_TRUE ? ISC_R_SUCCESS : ISC_R_FAILURE); -} - -static isc_boolean_t -ssu_checkall(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, - dns_ssutable_t *ssutable, dns_name_t *signer) -{ - isc_result_t result; - ssu_check_t ssuinfo; - - ssuinfo.name = name; - ssuinfo.table = ssutable; - ssuinfo.signer = signer; - result = foreach_rrset(db, ver, name, ssu_checkrule, &ssuinfo); - return (ISC_TF(result == ISC_R_SUCCESS)); -} - -/**************************************************************************/ -/* - * Checking of "RRset exists (value dependent)" prerequisites. - * - * In the RFC2136 section 3.2.5, this is the pseudocode involving - * a variable called "temp", a mapping of <name, type> tuples to rrsets. - * - * Here, we represent the "temp" data structure as (non-minimial) "dns_diff_t" - * where each typle has op==DNS_DIFFOP_EXISTS. - */ - - -/*% - * Append a tuple asserting the existence of the RR with - * 'name' and 'rdata' to 'diff'. - */ -static isc_result_t -temp_append(dns_diff_t *diff, dns_name_t *name, dns_rdata_t *rdata) { - isc_result_t result; - dns_difftuple_t *tuple = NULL; - - REQUIRE(DNS_DIFF_VALID(diff)); - CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_EXISTS, - name, 0, rdata, &tuple)); - ISC_LIST_APPEND(diff->tuples, tuple, link); - failure: - return (result); -} - -/*% - * Compare two rdatasets represented as sorted lists of tuples. - * All list elements must have the same owner name and type. - * Return ISC_R_SUCCESS if the rdatasets are equal, rcode(dns_rcode_nxrrset) - * if not. - */ -static isc_result_t -temp_check_rrset(dns_difftuple_t *a, dns_difftuple_t *b) { - for (;;) { - if (a == NULL || b == NULL) - break; - INSIST(a->op == DNS_DIFFOP_EXISTS && - b->op == DNS_DIFFOP_EXISTS); - INSIST(a->rdata.type == b->rdata.type); - INSIST(dns_name_equal(&a->name, &b->name)); - if (dns_rdata_compare(&a->rdata, &b->rdata) != 0) - return (DNS_R_NXRRSET); - a = ISC_LIST_NEXT(a, link); - b = ISC_LIST_NEXT(b, link); - } - if (a != NULL || b != NULL) - return (DNS_R_NXRRSET); - return (ISC_R_SUCCESS); -} - -/*% - * A comparison function defining the sorting order for the entries - * in the "temp" data structure. The major sort key is the owner name, - * followed by the type and rdata. - */ -static int -temp_order(const void *av, const void *bv) { - dns_difftuple_t const * const *ap = av; - dns_difftuple_t const * const *bp = bv; - dns_difftuple_t const *a = *ap; - dns_difftuple_t const *b = *bp; - int r; - r = dns_name_compare(&a->name, &b->name); - if (r != 0) - return (r); - r = (b->rdata.type - a->rdata.type); - if (r != 0) - return (r); - r = dns_rdata_compare(&a->rdata, &b->rdata); - return (r); -} - -/*% - * Check the "RRset exists (value dependent)" prerequisite information - * in 'temp' against the contents of the database 'db'. - * - * Return ISC_R_SUCCESS if the prerequisites are satisfied, - * rcode(dns_rcode_nxrrset) if not. - * - * 'temp' must be pre-sorted. - */ - -static isc_result_t -temp_check(isc_mem_t *mctx, dns_diff_t *temp, dns_db_t *db, - dns_dbversion_t *ver, dns_name_t *tmpname, dns_rdatatype_t *typep) -{ - isc_result_t result; - dns_name_t *name; - dns_dbnode_t *node; - dns_difftuple_t *t; - dns_diff_t trash; - - dns_diff_init(mctx, &trash); - - /* - * For each name and type in the prerequisites, - * construct a sorted rdata list of the corresponding - * database contents, and compare the lists. - */ - t = ISC_LIST_HEAD(temp->tuples); - while (t != NULL) { - name = &t->name; - (void)dns_name_copy(name, tmpname, NULL); - *typep = t->rdata.type; - - /* A new unique name begins here. */ - node = NULL; - result = dns_db_findnode(db, name, ISC_FALSE, &node); - if (result == ISC_R_NOTFOUND) - return (DNS_R_NXRRSET); - if (result != ISC_R_SUCCESS) - return (result); - - /* A new unique type begins here. */ - while (t != NULL && dns_name_equal(&t->name, name)) { - dns_rdatatype_t type, covers; - dns_rdataset_t rdataset; - dns_diff_t d_rrs; /* Database RRs with - this name and type */ - dns_diff_t u_rrs; /* Update RRs with - this name and type */ - - *typep = type = t->rdata.type; - if (type == dns_rdatatype_rrsig || - type == dns_rdatatype_sig) - covers = dns_rdata_covers(&t->rdata); - else - covers = 0; - - /* - * Collect all database RRs for this name and type - * onto d_rrs and sort them. - */ - dns_rdataset_init(&rdataset); - result = dns_db_findrdataset(db, node, ver, type, - covers, (isc_stdtime_t) 0, - &rdataset, NULL); - if (result != ISC_R_SUCCESS) { - dns_db_detachnode(db, &node); - return (DNS_R_NXRRSET); - } - - dns_diff_init(mctx, &d_rrs); - dns_diff_init(mctx, &u_rrs); - - for (result = dns_rdataset_first(&rdataset); - result == ISC_R_SUCCESS; - result = dns_rdataset_next(&rdataset)) - { - dns_rdata_t rdata = DNS_RDATA_INIT; - dns_rdataset_current(&rdataset, &rdata); - result = temp_append(&d_rrs, name, &rdata); - if (result != ISC_R_SUCCESS) - goto failure; - } - if (result != ISC_R_NOMORE) - goto failure; - result = dns_diff_sort(&d_rrs, temp_order); - if (result != ISC_R_SUCCESS) - goto failure; - - /* - * Collect all update RRs for this name and type - * onto u_rrs. No need to sort them here - - * they are already sorted. - */ - while (t != NULL && - dns_name_equal(&t->name, name) && - t->rdata.type == type) - { - dns_difftuple_t *next = - ISC_LIST_NEXT(t, link); - ISC_LIST_UNLINK(temp->tuples, t, link); - ISC_LIST_APPEND(u_rrs.tuples, t, link); - t = next; - } - - /* Compare the two sorted lists. */ - result = temp_check_rrset(ISC_LIST_HEAD(u_rrs.tuples), - ISC_LIST_HEAD(d_rrs.tuples)); - if (result != ISC_R_SUCCESS) - goto failure; - - /* - * We are done with the tuples, but we can't free - * them yet because "name" still points into one - * of them. Move them on a temporary list. - */ - ISC_LIST_APPENDLIST(trash.tuples, u_rrs.tuples, link); - ISC_LIST_APPENDLIST(trash.tuples, d_rrs.tuples, link); - dns_rdataset_disassociate(&rdataset); - - continue; - - failure: - dns_diff_clear(&d_rrs); - dns_diff_clear(&u_rrs); - dns_diff_clear(&trash); - dns_rdataset_disassociate(&rdataset); - dns_db_detachnode(db, &node); - return (result); - } - - dns_db_detachnode(db, &node); - } - - dns_diff_clear(&trash); - return (ISC_R_SUCCESS); -} - -/**************************************************************************/ -/* - * Conditional deletion of RRs. - */ - -/*% - * Context structure for delete_if(). - */ - -typedef struct { - rr_predicate *predicate; - dns_db_t *db; - dns_dbversion_t *ver; - dns_diff_t *diff; - dns_name_t *name; - dns_rdata_t *update_rr; -} conditional_delete_ctx_t; - -/*% - * Predicate functions for delete_if(). - */ - -/*% - * Return true iff 'db_rr' is neither a SOA nor an NS RR nor - * an RRSIG nor a NSEC. - */ -static isc_boolean_t -type_not_soa_nor_ns_p(dns_rdata_t *update_rr, dns_rdata_t *db_rr) { - UNUSED(update_rr); - return ((db_rr->type != dns_rdatatype_soa && - db_rr->type != dns_rdatatype_ns && - db_rr->type != dns_rdatatype_rrsig && - db_rr->type != dns_rdatatype_nsec) ? - ISC_TRUE : ISC_FALSE); -} - -/*% - * Return true iff 'db_rr' is neither a RRSIG nor a NSEC. - */ -static isc_boolean_t -type_not_dnssec(dns_rdata_t *update_rr, dns_rdata_t *db_rr) { - UNUSED(update_rr); - return ((db_rr->type != dns_rdatatype_rrsig && - db_rr->type != dns_rdatatype_nsec) ? - ISC_TRUE : ISC_FALSE); -} - -/*% - * Return true always. - */ -static isc_boolean_t -true_p(dns_rdata_t *update_rr, dns_rdata_t *db_rr) { - UNUSED(update_rr); - UNUSED(db_rr); - return (ISC_TRUE); -} - -/*% - * Return true iff the two RRs have identical rdata. - */ -static isc_boolean_t -rr_equal_p(dns_rdata_t *update_rr, dns_rdata_t *db_rr) { - /* - * XXXRTH This is not a problem, but we should consider creating - * dns_rdata_equal() (that used dns_name_equal()), since it - * would be faster. Not a priority. - */ - return (dns_rdata_compare(update_rr, db_rr) == 0 ? - ISC_TRUE : ISC_FALSE); -} - -/*% - * Return true iff 'update_rr' should replace 'db_rr' according - * to the special RFC2136 rules for CNAME, SOA, and WKS records. - * - * RFC2136 does not mention NSEC or DNAME, but multiple NSECs or DNAMEs - * make little sense, so we replace those, too. - */ -static isc_boolean_t -replaces_p(dns_rdata_t *update_rr, dns_rdata_t *db_rr) { - if (db_rr->type != update_rr->type) - return (ISC_FALSE); - if (db_rr->type == dns_rdatatype_cname) - return (ISC_TRUE); - if (db_rr->type == dns_rdatatype_dname) - return (ISC_TRUE); - if (db_rr->type == dns_rdatatype_soa) - return (ISC_TRUE); - if (db_rr->type == dns_rdatatype_nsec) - return (ISC_TRUE); - if (db_rr->type == dns_rdatatype_wks) { - /* - * Compare the address and protocol fields only. These - * form the first five bytes of the RR data. Do a - * raw binary comparison; unpacking the WKS RRs using - * dns_rdata_tostruct() might be cleaner in some ways, - * but it would require us to pass around an mctx. - */ - INSIST(db_rr->length >= 5 && update_rr->length >= 5); - return (memcmp(db_rr->data, update_rr->data, 5) == 0 ? - ISC_TRUE : ISC_FALSE); - } - return (ISC_FALSE); -} - -/*% - * Internal helper function for delete_if(). - */ -static isc_result_t -delete_if_action(void *data, rr_t *rr) { - conditional_delete_ctx_t *ctx = data; - if ((*ctx->predicate)(ctx->update_rr, &rr->rdata)) { - isc_result_t result; - result = update_one_rr(ctx->db, ctx->ver, ctx->diff, - DNS_DIFFOP_DEL, ctx->name, - rr->ttl, &rr->rdata); - return (result); - } else { - return (ISC_R_SUCCESS); - } -} - -/*% - * Conditionally delete RRs. Apply 'predicate' to the RRs - * specified by 'db', 'ver', 'name', and 'type' (which can - * be dns_rdatatype_any to match any type). Delete those - * RRs for which the predicate returns true, and log the - * deletions in 'diff'. - */ -static isc_result_t -delete_if(rr_predicate *predicate, - dns_db_t *db, - dns_dbversion_t *ver, - dns_name_t *name, - dns_rdatatype_t type, - dns_rdatatype_t covers, - dns_rdata_t *update_rr, - dns_diff_t *diff) -{ - conditional_delete_ctx_t ctx; - ctx.predicate = predicate; - ctx.db = db; - ctx.ver = ver; - ctx.diff = diff; - ctx.name = name; - ctx.update_rr = update_rr; - return (foreach_rr(db, ver, name, type, covers, - delete_if_action, &ctx)); -} - -/**************************************************************************/ -/*% - * Prepare an RR for the addition of the new RR 'ctx->update_rr', - * with TTL 'ctx->update_rr_ttl', to its rdataset, by deleting - * the RRs if it is replaced by the new RR or has a conflicting TTL. - * The necessary changes are appended to ctx->del_diff and ctx->add_diff; - * we need to do all deletions before any additions so that we don't run - * into transient states with conflicting TTLs. - */ - -typedef struct { - dns_db_t *db; - dns_dbversion_t *ver; - dns_diff_t *diff; - dns_name_t *name; - dns_rdata_t *update_rr; - dns_ttl_t update_rr_ttl; - isc_boolean_t ignore_add; - dns_diff_t del_diff; - dns_diff_t add_diff; -} add_rr_prepare_ctx_t; - -static isc_result_t -add_rr_prepare_action(void *data, rr_t *rr) { - isc_result_t result = ISC_R_SUCCESS; - add_rr_prepare_ctx_t *ctx = data; - dns_difftuple_t *tuple = NULL; - isc_boolean_t equal; - - /* - * If the update RR is a "duplicate" of the update RR, - * the update should be silently ignored. - */ - equal = ISC_TF(dns_rdata_compare(&rr->rdata, ctx->update_rr) == 0); - if (equal && rr->ttl == ctx->update_rr_ttl) { - ctx->ignore_add = ISC_TRUE; - return (ISC_R_SUCCESS); - } - - /* - * If this RR is "equal" to the update RR, it should - * be deleted before the update RR is added. - */ - if (replaces_p(ctx->update_rr, &rr->rdata)) { - CHECK(dns_difftuple_create(ctx->del_diff.mctx, - DNS_DIFFOP_DEL, ctx->name, - rr->ttl, - &rr->rdata, - &tuple)); - dns_diff_append(&ctx->del_diff, &tuple); - return (ISC_R_SUCCESS); - } - - /* - * If this RR differs in TTL from the update RR, - * its TTL must be adjusted. - */ - if (rr->ttl != ctx->update_rr_ttl) { - CHECK(dns_difftuple_create(ctx->del_diff.mctx, - DNS_DIFFOP_DEL, ctx->name, - rr->ttl, - &rr->rdata, - &tuple)); - dns_diff_append(&ctx->del_diff, &tuple); - if (!equal) { - CHECK(dns_difftuple_create(ctx->add_diff.mctx, - DNS_DIFFOP_ADD, ctx->name, - ctx->update_rr_ttl, - &rr->rdata, - &tuple)); - dns_diff_append(&ctx->add_diff, &tuple); - } - } - failure: - return (result); -} - -/**************************************************************************/ -/* - * Miscellaneous subroutines. - */ - -/*% - * Extract a single update RR from 'section' of dynamic update message - * 'msg', with consistency checking. - * - * Stores the owner name, rdata, and TTL of the update RR at 'name', - * 'rdata', and 'ttl', respectively. - */ -static void -get_current_rr(dns_message_t *msg, dns_section_t section, - dns_rdataclass_t zoneclass, - dns_name_t **name, dns_rdata_t *rdata, dns_rdatatype_t *covers, - dns_ttl_t *ttl, - dns_rdataclass_t *update_class) -{ - dns_rdataset_t *rdataset; - isc_result_t result; - dns_message_currentname(msg, section, name); - rdataset = ISC_LIST_HEAD((*name)->list); - INSIST(rdataset != NULL); - INSIST(ISC_LIST_NEXT(rdataset, link) == NULL); - *covers = rdataset->covers; - *ttl = rdataset->ttl; - result = dns_rdataset_first(rdataset); - INSIST(result == ISC_R_SUCCESS); - dns_rdataset_current(rdataset, rdata); - INSIST(dns_rdataset_next(rdataset) == ISC_R_NOMORE); - *update_class = rdata->rdclass; - rdata->rdclass = zoneclass; -} - -/*% - * Increment the SOA serial number of database 'db', version 'ver'. - * Replace the SOA record in the database, and log the - * change in 'diff'. - */ - - /* - * XXXRTH Failures in this routine will be worth logging, when - * we have a logging system. Failure to find the zonename - * or the SOA rdataset warrant at least an UNEXPECTED_ERROR(). - */ - -static isc_result_t -increment_soa_serial(dns_db_t *db, dns_dbversion_t *ver, - dns_diff_t *diff, isc_mem_t *mctx) -{ - dns_difftuple_t *deltuple = NULL; - dns_difftuple_t *addtuple = NULL; - isc_uint32_t serial; - isc_result_t result; - - CHECK(dns_db_createsoatuple(db, ver, mctx, DNS_DIFFOP_DEL, &deltuple)); - CHECK(dns_difftuple_copy(deltuple, &addtuple)); - addtuple->op = DNS_DIFFOP_ADD; - - serial = dns_soa_getserial(&addtuple->rdata); - - /* RFC1982 */ - serial = (serial + 1) & 0xFFFFFFFF; - if (serial == 0) - serial = 1; - - dns_soa_setserial(serial, &addtuple->rdata); - CHECK(do_one_tuple(&deltuple, db, ver, diff)); - CHECK(do_one_tuple(&addtuple, db, ver, diff)); - result = ISC_R_SUCCESS; - - failure: - if (addtuple != NULL) - dns_difftuple_free(&addtuple); - if (deltuple != NULL) - dns_difftuple_free(&deltuple); - return (result); -} - -/*% - * Check that the new SOA record at 'update_rdata' does not - * illegally cause the SOA serial number to decrease or stay - * unchanged relative to the existing SOA in 'db'. - * - * Sets '*ok' to ISC_TRUE if the update is legal, ISC_FALSE if not. - * - * William King points out that RFC2136 is inconsistent about - * the case where the serial number stays unchanged: - * - * section 3.4.2.2 requires a server to ignore a SOA update request - * if the serial number on the update SOA is less_than_or_equal to - * the zone SOA serial. - * - * section 3.6 requires a server to ignore a SOA update request if - * the serial is less_than the zone SOA serial. - * - * Paul says 3.4.2.2 is correct. - * - */ -static isc_result_t -check_soa_increment(dns_db_t *db, dns_dbversion_t *ver, - dns_rdata_t *update_rdata, - isc_boolean_t *ok) -{ - isc_uint32_t db_serial; - isc_uint32_t update_serial; - isc_result_t result; - - update_serial = dns_soa_getserial(update_rdata); - - result = dns_db_getsoaserial(db, ver, &db_serial); - if (result != ISC_R_SUCCESS) - return (result); - - if (DNS_SERIAL_GE(db_serial, update_serial)) { - *ok = ISC_FALSE; - } else { - *ok = ISC_TRUE; - } - - return (ISC_R_SUCCESS); - -} - -/**************************************************************************/ -/* - * Incremental updating of NSECs and RRSIGs. - */ - -#define MAXZONEKEYS 32 /*%< Maximum number of zone keys supported. */ - -/*% - * We abuse the dns_diff_t type to represent a set of domain names - * affected by the update. - */ -static isc_result_t -namelist_append_name(dns_diff_t *list, dns_name_t *name) { - isc_result_t result; - dns_difftuple_t *tuple = NULL; - static dns_rdata_t dummy_rdata = DNS_RDATA_INIT; - - CHECK(dns_difftuple_create(list->mctx, DNS_DIFFOP_EXISTS, name, 0, - &dummy_rdata, &tuple)); - dns_diff_append(list, &tuple); - failure: - return (result); -} - -static isc_result_t -namelist_append_subdomain(dns_db_t *db, dns_name_t *name, dns_diff_t *affected) -{ - isc_result_t result; - dns_fixedname_t fixedname; - dns_name_t *child; - dns_dbiterator_t *dbit = NULL; - - dns_fixedname_init(&fixedname); - child = dns_fixedname_name(&fixedname); - - CHECK(dns_db_createiterator(db, ISC_FALSE, &dbit)); - - for (result = dns_dbiterator_seek(dbit, name); - result == ISC_R_SUCCESS; - result = dns_dbiterator_next(dbit)) - { - dns_dbnode_t *node = NULL; - CHECK(dns_dbiterator_current(dbit, &node, child)); - dns_db_detachnode(db, &node); - if (! dns_name_issubdomain(child, name)) - break; - CHECK(namelist_append_name(affected, child)); - } - if (result == ISC_R_NOMORE) - result = ISC_R_SUCCESS; - failure: - if (dbit != NULL) - dns_dbiterator_destroy(&dbit); - return (result); -} - - - -/*% - * Helper function for non_nsec_rrset_exists(). - */ -static isc_result_t -is_non_nsec_action(void *data, dns_rdataset_t *rrset) { - UNUSED(data); - if (!(rrset->type == dns_rdatatype_nsec || - (rrset->type == dns_rdatatype_rrsig && - rrset->covers == dns_rdatatype_nsec))) - return (ISC_R_EXISTS); - return (ISC_R_SUCCESS); -} - -/*% - * Check whether there is an rrset other than a NSEC or RRSIG NSEC, - * i.e., anything that justifies the continued existence of a name - * after a secure update. - * - * If such an rrset exists, set '*exists' to ISC_TRUE. - * Otherwise, set it to ISC_FALSE. - */ -static isc_result_t -non_nsec_rrset_exists(dns_db_t *db, dns_dbversion_t *ver, - dns_name_t *name, isc_boolean_t *exists) -{ - isc_result_t result; - result = foreach_rrset(db, ver, name, - is_non_nsec_action, NULL); - RETURN_EXISTENCE_FLAG; -} - -/*% - * A comparison function for sorting dns_diff_t:s by name. - */ -static int -name_order(const void *av, const void *bv) { - dns_difftuple_t const * const *ap = av; - dns_difftuple_t const * const *bp = bv; - dns_difftuple_t const *a = *ap; - dns_difftuple_t const *b = *bp; - return (dns_name_compare(&a->name, &b->name)); -} - -static isc_result_t -uniqify_name_list(dns_diff_t *list) { - isc_result_t result; - dns_difftuple_t *p, *q; - - CHECK(dns_diff_sort(list, name_order)); - - p = ISC_LIST_HEAD(list->tuples); - while (p != NULL) { - do { - q = ISC_LIST_NEXT(p, link); - if (q == NULL || ! dns_name_equal(&p->name, &q->name)) - break; - ISC_LIST_UNLINK(list->tuples, q, link); - dns_difftuple_free(&q); - } while (1); - p = ISC_LIST_NEXT(p, link); - } - failure: - return (result); -} - - -static isc_result_t -is_glue(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, - isc_boolean_t *flag) -{ - isc_result_t result; - dns_fixedname_t foundname; - dns_fixedname_init(&foundname); - result = dns_db_find(db, name, ver, dns_rdatatype_any, - DNS_DBFIND_GLUEOK | DNS_DBFIND_NOWILD, - (isc_stdtime_t) 0, NULL, - dns_fixedname_name(&foundname), - NULL, NULL); - if (result == ISC_R_SUCCESS) { - *flag = ISC_FALSE; - return (ISC_R_SUCCESS); - } else if (result == DNS_R_ZONECUT) { - /* - * We are at the zonecut. The name will have an NSEC, but - * non-delegation will be omitted from the type bit map. - */ - *flag = ISC_FALSE; - return (ISC_R_SUCCESS); - } else if (result == DNS_R_GLUE || result == DNS_R_DNAME) { - *flag = ISC_TRUE; - return (ISC_R_SUCCESS); - } else { - return (result); - } -} - -/*% - * Find the next/previous name that has a NSEC record. - * In other words, skip empty database nodes and names that - * have had their NSECs removed because they are obscured by - * a zone cut. - */ -static isc_result_t -next_active(ns_client_t *client, dns_zone_t *zone, dns_db_t *db, - dns_dbversion_t *ver, dns_name_t *oldname, dns_name_t *newname, - isc_boolean_t forward) -{ - isc_result_t result; - dns_dbiterator_t *dbit = NULL; - isc_boolean_t has_nsec; - unsigned int wraps = 0; - - CHECK(dns_db_createiterator(db, ISC_FALSE, &dbit)); - - CHECK(dns_dbiterator_seek(dbit, oldname)); - do { - dns_dbnode_t *node = NULL; - - if (forward) - result = dns_dbiterator_next(dbit); - else - result = dns_dbiterator_prev(dbit); - if (result == ISC_R_NOMORE) { - /* - * Wrap around. - */ - if (forward) - CHECK(dns_dbiterator_first(dbit)); - else - CHECK(dns_dbiterator_last(dbit)); - wraps++; - if (wraps == 2) { - update_log(client, zone, ISC_LOG_ERROR, - "secure zone with no NSECs"); - result = DNS_R_BADZONE; - goto failure; - } - } - CHECK(dns_dbiterator_current(dbit, &node, newname)); - dns_db_detachnode(db, &node); - - /* - * The iterator may hold the tree lock, and - * rrset_exists() calls dns_db_findnode() which - * may try to reacquire it. To avoid deadlock - * we must pause the iterator first. - */ - CHECK(dns_dbiterator_pause(dbit)); - CHECK(rrset_exists(db, ver, newname, - dns_rdatatype_nsec, 0, &has_nsec)); - - } while (! has_nsec); - failure: - if (dbit != NULL) - dns_dbiterator_destroy(&dbit); - - return (result); -} - -/*% - * Add a NSEC record for "name", recording the change in "diff". - * The existing NSEC is removed. - */ -static isc_result_t -add_nsec(ns_client_t *client, dns_zone_t *zone, dns_db_t *db, - dns_dbversion_t *ver, dns_name_t *name, dns_ttl_t nsecttl, - dns_diff_t *diff) -{ - isc_result_t result; - dns_dbnode_t *node = NULL; - unsigned char buffer[DNS_NSEC_BUFFERSIZE]; - dns_rdata_t rdata = DNS_RDATA_INIT; - dns_difftuple_t *tuple = NULL; - dns_fixedname_t fixedname; - dns_name_t *target; - - dns_fixedname_init(&fixedname); - target = dns_fixedname_name(&fixedname); - - /* - * Find the successor name, aka NSEC target. - */ - CHECK(next_active(client, zone, db, ver, name, target, ISC_TRUE)); - - /* - * Create the NSEC RDATA. - */ - CHECK(dns_db_findnode(db, name, ISC_FALSE, &node)); - dns_rdata_init(&rdata); - CHECK(dns_nsec_buildrdata(db, ver, node, target, buffer, &rdata)); - dns_db_detachnode(db, &node); - - /* - * Delete the old NSEC and record the change. - */ - CHECK(delete_if(true_p, db, ver, name, dns_rdatatype_nsec, 0, - NULL, diff)); - /* - * Add the new NSEC and record the change. - */ - CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD, name, - nsecttl, &rdata, &tuple)); - CHECK(do_one_tuple(&tuple, db, ver, diff)); - INSIST(tuple == NULL); - - failure: - if (node != NULL) - dns_db_detachnode(db, &node); - return (result); -} - -/*% - * Add a placeholder NSEC record for "name", recording the change in "diff". - */ -static isc_result_t -add_placeholder_nsec(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, - dns_diff_t *diff) { - isc_result_t result; - dns_difftuple_t *tuple = NULL; - isc_region_t r; - unsigned char data[1] = { 0 }; /* The root domain, no bits. */ - dns_rdata_t rdata = DNS_RDATA_INIT; - - r.base = data; - r.length = sizeof(data); - dns_rdata_fromregion(&rdata, dns_db_class(db), dns_rdatatype_nsec, &r); - CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD, name, 0, - &rdata, &tuple)); - CHECK(do_one_tuple(&tuple, db, ver, diff)); - failure: - return (result); -} - -static isc_result_t -find_zone_keys(dns_zone_t *zone, dns_db_t *db, dns_dbversion_t *ver, - isc_mem_t *mctx, unsigned int maxkeys, - dst_key_t **keys, unsigned int *nkeys) -{ - isc_result_t result; - dns_dbnode_t *node = NULL; - const char *directory = dns_zone_getkeydirectory(zone); - CHECK(dns_db_findnode(db, dns_db_origin(db), ISC_FALSE, &node)); - CHECK(dns_dnssec_findzonekeys2(db, ver, node, dns_db_origin(db), - directory, mctx, maxkeys, keys, nkeys)); - failure: - if (node != NULL) - dns_db_detachnode(db, &node); - return (result); -} - -static isc_boolean_t -ksk_sanity(dns_db_t *db, dns_dbversion_t *ver) { - isc_boolean_t ret = ISC_FALSE; - isc_boolean_t have_ksk = ISC_FALSE, have_nonksk = ISC_FALSE; - isc_result_t result; - dns_dbnode_t *node = NULL; - dns_rdataset_t rdataset; - dns_rdata_t rdata = DNS_RDATA_INIT; - dns_rdata_dnskey_t dnskey; - - dns_rdataset_init(&rdataset); - CHECK(dns_db_findnode(db, dns_db_origin(db), ISC_FALSE, &node)); - CHECK(dns_db_findrdataset(db, node, ver, dns_rdatatype_dnskey, 0, 0, - &rdataset, NULL)); - CHECK(dns_rdataset_first(&rdataset)); - while (result == ISC_R_SUCCESS && (!have_ksk || !have_nonksk)) { - dns_rdataset_current(&rdataset, &rdata); - CHECK(dns_rdata_tostruct(&rdata, &dnskey, NULL)); - if ((dnskey.flags & (DNS_KEYFLAG_OWNERMASK|DNS_KEYTYPE_NOAUTH)) - == DNS_KEYOWNER_ZONE) { - if ((dnskey.flags & DNS_KEYFLAG_KSK) != 0) - have_ksk = ISC_TRUE; - else - have_nonksk = ISC_TRUE; - } - dns_rdata_reset(&rdata); - result = dns_rdataset_next(&rdataset); - } - if (have_ksk && have_nonksk) - ret = ISC_TRUE; - failure: - if (dns_rdataset_isassociated(&rdataset)) - dns_rdataset_disassociate(&rdataset); - if (node != NULL) - dns_db_detachnode(db, &node); - return (ret); -} - -/*% - * Add RRSIG records for an RRset, recording the change in "diff". - */ -static isc_result_t -add_sigs(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, - dns_rdatatype_t type, dns_diff_t *diff, dst_key_t **keys, - unsigned int nkeys, isc_mem_t *mctx, isc_stdtime_t inception, - isc_stdtime_t expire, isc_boolean_t check_ksk) -{ - isc_result_t result; - dns_dbnode_t *node = NULL; - dns_rdataset_t rdataset; - dns_rdata_t sig_rdata = DNS_RDATA_INIT; - isc_buffer_t buffer; - unsigned char data[1024]; /* XXX */ - unsigned int i; - - dns_rdataset_init(&rdataset); - isc_buffer_init(&buffer, data, sizeof(data)); - - /* Get the rdataset to sign. */ - CHECK(dns_db_findnode(db, name, ISC_FALSE, &node)); - CHECK(dns_db_findrdataset(db, node, ver, type, 0, - (isc_stdtime_t) 0, - &rdataset, NULL)); - dns_db_detachnode(db, &node); - - for (i = 0; i < nkeys; i++) { - - if (check_ksk && type != dns_rdatatype_dnskey && - (dst_key_flags(keys[i]) & DNS_KEYFLAG_KSK) != 0) - continue; - - if (!dst_key_isprivate(keys[i])) - continue; - - /* Calculate the signature, creating a RRSIG RDATA. */ - CHECK(dns_dnssec_sign(name, &rdataset, keys[i], - &inception, &expire, - mctx, &buffer, &sig_rdata)); - - /* Update the database and journal with the RRSIG. */ - /* XXX inefficient - will cause dataset merging */ - CHECK(update_one_rr(db, ver, diff, DNS_DIFFOP_ADD, name, - rdataset.ttl, &sig_rdata)); - dns_rdata_reset(&sig_rdata); - } - - failure: - if (dns_rdataset_isassociated(&rdataset)) - dns_rdataset_disassociate(&rdataset); - if (node != NULL) - dns_db_detachnode(db, &node); - return (result); -} - -/*% - * Update RRSIG and NSEC records affected by an update. The original - * update, including the SOA serial update but exluding the RRSIG & NSEC - * changes, is in "diff" and has already been applied to "newver" of "db". - * The database version prior to the update is "oldver". - * - * The necessary RRSIG and NSEC changes will be applied to "newver" - * and added (as a minimal diff) to "diff". - * - * The RRSIGs generated will be valid for 'sigvalidityinterval' seconds. - */ -static isc_result_t -update_signatures(ns_client_t *client, dns_zone_t *zone, dns_db_t *db, - dns_dbversion_t *oldver, dns_dbversion_t *newver, - dns_diff_t *diff, isc_uint32_t sigvalidityinterval) -{ - isc_result_t result; - dns_difftuple_t *t; - dns_diff_t diffnames; - dns_diff_t affected; - dns_diff_t sig_diff; - dns_diff_t nsec_diff; - dns_diff_t nsec_mindiff; - isc_boolean_t flag; - dst_key_t *zone_keys[MAXZONEKEYS]; - unsigned int nkeys = 0; - unsigned int i; - isc_stdtime_t now, inception, expire; - dns_ttl_t nsecttl; - dns_rdata_soa_t soa; - dns_rdata_t rdata = DNS_RDATA_INIT; - dns_rdataset_t rdataset; - dns_dbnode_t *node = NULL; - isc_boolean_t check_ksk; - - dns_diff_init(client->mctx, &diffnames); - dns_diff_init(client->mctx, &affected); - - dns_diff_init(client->mctx, &sig_diff); - dns_diff_init(client->mctx, &nsec_diff); - dns_diff_init(client->mctx, &nsec_mindiff); - - result = find_zone_keys(zone, db, newver, client->mctx, - MAXZONEKEYS, zone_keys, &nkeys); - if (result != ISC_R_SUCCESS) { - update_log(client, zone, ISC_LOG_ERROR, - "could not get zone keys for secure dynamic update"); - goto failure; - } - - isc_stdtime_get(&now); - inception = now - 3600; /* Allow for some clock skew. */ - expire = now + sigvalidityinterval; - - /* - * Do we look at the KSK flag on the DNSKEY to determining which - * keys sign which RRsets? First check the zone option then - * check the keys flags to make sure atleast one has a ksk set - * and one doesn't. - */ - check_ksk = ISC_TF((dns_zone_getoptions(zone) & - DNS_ZONEOPT_UPDATECHECKKSK) != 0); - if (check_ksk) - check_ksk = ksk_sanity(db, newver); - - /* - * Get the NSEC's TTL from the SOA MINIMUM field. - */ - CHECK(dns_db_findnode(db, dns_db_origin(db), ISC_FALSE, &node)); - dns_rdataset_init(&rdataset); - CHECK(dns_db_findrdataset(db, node, newver, dns_rdatatype_soa, 0, - (isc_stdtime_t) 0, &rdataset, NULL)); - CHECK(dns_rdataset_first(&rdataset)); - dns_rdataset_current(&rdataset, &rdata); - CHECK(dns_rdata_tostruct(&rdata, &soa, NULL)); - nsecttl = soa.minimum; - dns_rdataset_disassociate(&rdataset); - dns_db_detachnode(db, &node); - - /* - * Find all RRsets directly affected by the update, and - * update their RRSIGs. Also build a list of names affected - * by the update in "diffnames". - */ - CHECK(dns_diff_sort(diff, temp_order)); - - t = ISC_LIST_HEAD(diff->tuples); - while (t != NULL) { - dns_name_t *name = &t->name; - /* Now "name" is a new, unique name affected by the update. */ - - CHECK(namelist_append_name(&diffnames, name)); - - while (t != NULL && dns_name_equal(&t->name, name)) { - dns_rdatatype_t type; - type = t->rdata.type; - - /* - * Now "name" and "type" denote a new unique RRset - * affected by the update. - */ - - /* Don't sign RRSIGs. */ - if (type == dns_rdatatype_rrsig) - goto skip; - - /* - * Delete all old RRSIGs covering this type, since they - * are all invalid when the signed RRset has changed. - * We may not be able to recreate all of them - tough. - */ - CHECK(delete_if(true_p, db, newver, name, - dns_rdatatype_rrsig, type, - NULL, &sig_diff)); - - /* - * If this RRset still exists after the update, - * add a new signature for it. - */ - CHECK(rrset_exists(db, newver, name, type, 0, &flag)); - if (flag) { - CHECK(add_sigs(db, newver, name, type, - &sig_diff, zone_keys, nkeys, - client->mctx, inception, - expire, check_ksk)); - } - skip: - /* Skip any other updates to the same RRset. */ - while (t != NULL && - dns_name_equal(&t->name, name) && - t->rdata.type == type) - { - t = ISC_LIST_NEXT(t, link); - } - } - } - - /* Remove orphaned NSECs and RRSIG NSECs. */ - for (t = ISC_LIST_HEAD(diffnames.tuples); - t != NULL; - t = ISC_LIST_NEXT(t, link)) - { - CHECK(non_nsec_rrset_exists(db, newver, &t->name, &flag)); - if (! flag) { - CHECK(delete_if(true_p, db, newver, &t->name, - dns_rdatatype_any, 0, - NULL, &sig_diff)); - } - } - - /* - * When a name is created or deleted, its predecessor needs to - * have its NSEC updated. - */ - for (t = ISC_LIST_HEAD(diffnames.tuples); - t != NULL; - t = ISC_LIST_NEXT(t, link)) - { - isc_boolean_t existed, exists; - dns_fixedname_t fixedname; - dns_name_t *prevname; - - dns_fixedname_init(&fixedname); - prevname = dns_fixedname_name(&fixedname); - - CHECK(name_exists(db, oldver, &t->name, &existed)); - CHECK(name_exists(db, newver, &t->name, &exists)); - if (exists == existed) - continue; - - /* - * Find the predecessor. - * When names become obscured or unobscured in this update - * transaction, we may find the wrong predecessor because - * the NSECs have not yet been updated to reflect the delegation - * change. This should not matter because in this case, - * the correct predecessor is either the delegation node or - * a newly unobscured node, and those nodes are on the - * "affected" list in any case. - */ - CHECK(next_active(client, zone, db, newver, - &t->name, prevname, ISC_FALSE)); - CHECK(namelist_append_name(&affected, prevname)); - } - - /* - * Find names potentially affected by delegation changes - * (obscured by adding an NS or DNAME, or unobscured by - * removing one). - */ - for (t = ISC_LIST_HEAD(diffnames.tuples); - t != NULL; - t = ISC_LIST_NEXT(t, link)) - { - isc_boolean_t ns_existed, dname_existed; - isc_boolean_t ns_exists, dname_exists; - - CHECK(rrset_exists(db, oldver, &t->name, dns_rdatatype_ns, 0, - &ns_existed)); - CHECK(rrset_exists(db, oldver, &t->name, dns_rdatatype_dname, 0, - &dname_existed)); - CHECK(rrset_exists(db, newver, &t->name, dns_rdatatype_ns, 0, - &ns_exists)); - CHECK(rrset_exists(db, newver, &t->name, dns_rdatatype_dname, 0, - &dname_exists)); - if ((ns_exists || dname_exists) == (ns_existed || dname_existed)) - continue; - /* - * There was a delegation change. Mark all subdomains - * of t->name as potentially needing a NSEC update. - */ - CHECK(namelist_append_subdomain(db, &t->name, &affected)); - } - - ISC_LIST_APPENDLIST(affected.tuples, diffnames.tuples, link); - INSIST(ISC_LIST_EMPTY(diffnames.tuples)); - - CHECK(uniqify_name_list(&affected)); - - /* - * Determine which names should have NSECs, and delete/create - * NSECs to make it so. We don't know the final NSEC targets yet, - * so we just create placeholder NSECs with arbitrary contents - * to indicate that their respective owner names should be part of - * the NSEC chain. - */ - for (t = ISC_LIST_HEAD(affected.tuples); - t != NULL; - t = ISC_LIST_NEXT(t, link)) - { - isc_boolean_t exists; - CHECK(name_exists(db, newver, &t->name, &exists)); - if (! exists) - continue; - CHECK(is_glue(db, newver, &t->name, &flag)); - if (flag) { - /* - * This name is obscured. Delete any - * existing NSEC record. - */ - CHECK(delete_if(true_p, db, newver, &t->name, - dns_rdatatype_nsec, 0, - NULL, &nsec_diff)); - } else { - /* - * This name is not obscured. It should have a NSEC. - */ - CHECK(rrset_exists(db, newver, &t->name, - dns_rdatatype_nsec, 0, &flag)); - if (! flag) - CHECK(add_placeholder_nsec(db, newver, &t->name, - diff)); - } - } - - /* - * Now we know which names are part of the NSEC chain. - * Make them all point at their correct targets. - */ - for (t = ISC_LIST_HEAD(affected.tuples); - t != NULL; - t = ISC_LIST_NEXT(t, link)) - { - CHECK(rrset_exists(db, newver, &t->name, - dns_rdatatype_nsec, 0, &flag)); - if (flag) { - /* - * There is a NSEC, but we don't know if it is correct. - * Delete it and create a correct one to be sure. - * If the update was unnecessary, the diff minimization - * will take care of eliminating it from the journal, - * IXFRs, etc. - * - * The RRSIG bit should always be set in the NSECs - * we generate, because they will all get RRSIG NSECs. - * (XXX what if the zone keys are missing?). - * Because the RRSIG NSECs have not necessarily been - * created yet, the correctness of the bit mask relies - * on the assumption that NSECs are only created if - * there is other data, and if there is other data, - * there are other RRSIGs. - */ - CHECK(add_nsec(client, zone, db, newver, &t->name, - nsecttl, &nsec_diff)); - } - } - - /* - * Minimize the set of NSEC updates so that we don't - * have to regenerate the RRSIG NSECs for NSECs that were - * replaced with identical ones. - */ - while ((t = ISC_LIST_HEAD(nsec_diff.tuples)) != NULL) { - ISC_LIST_UNLINK(nsec_diff.tuples, t, link); - dns_diff_appendminimal(&nsec_mindiff, &t); - } - - /* Update RRSIG NSECs. */ - for (t = ISC_LIST_HEAD(nsec_mindiff.tuples); - t != NULL; - t = ISC_LIST_NEXT(t, link)) - { - if (t->op == DNS_DIFFOP_DEL) { - CHECK(delete_if(true_p, db, newver, &t->name, - dns_rdatatype_rrsig, dns_rdatatype_nsec, - NULL, &sig_diff)); - } else if (t->op == DNS_DIFFOP_ADD) { - CHECK(add_sigs(db, newver, &t->name, dns_rdatatype_nsec, - &sig_diff, zone_keys, nkeys, - client->mctx, inception, expire, - check_ksk)); - } else { - INSIST(0); - } - } - - /* Record our changes for the journal. */ - while ((t = ISC_LIST_HEAD(sig_diff.tuples)) != NULL) { - ISC_LIST_UNLINK(sig_diff.tuples, t, link); - dns_diff_appendminimal(diff, &t); - } - while ((t = ISC_LIST_HEAD(nsec_mindiff.tuples)) != NULL) { - ISC_LIST_UNLINK(nsec_mindiff.tuples, t, link); - dns_diff_appendminimal(diff, &t); - } - - INSIST(ISC_LIST_EMPTY(sig_diff.tuples)); - INSIST(ISC_LIST_EMPTY(nsec_diff.tuples)); - INSIST(ISC_LIST_EMPTY(nsec_mindiff.tuples)); - - failure: - dns_diff_clear(&sig_diff); - dns_diff_clear(&nsec_diff); - dns_diff_clear(&nsec_mindiff); - - dns_diff_clear(&affected); - dns_diff_clear(&diffnames); - - for (i = 0; i < nkeys; i++) - dst_key_free(&zone_keys[i]); - - return (result); -} - - -/**************************************************************************/ -/*% - * The actual update code in all its glory. We try to follow - * the RFC2136 pseudocode as closely as possible. - */ - -static isc_result_t -send_update_event(ns_client_t *client, dns_zone_t *zone) { - isc_result_t result = ISC_R_SUCCESS; - update_event_t *event = NULL; - isc_task_t *zonetask = NULL; - ns_client_t *evclient; - - event = (update_event_t *) - isc_event_allocate(client->mctx, client, DNS_EVENT_UPDATE, - update_action, NULL, sizeof(*event)); - if (event == NULL) - FAIL(ISC_R_NOMEMORY); - event->zone = zone; - event->result = ISC_R_SUCCESS; - - evclient = NULL; - ns_client_attach(client, &evclient); - INSIST(client->nupdates == 0); - client->nupdates++; - event->ev_arg = evclient; - - dns_zone_gettask(zone, &zonetask); - isc_task_send(zonetask, ISC_EVENT_PTR(&event)); - - failure: - if (event != NULL) - isc_event_free(ISC_EVENT_PTR(&event)); - return (result); -} - -static void -respond(ns_client_t *client, isc_result_t result) { - isc_result_t msg_result; - - msg_result = dns_message_reply(client->message, ISC_TRUE); - if (msg_result != ISC_R_SUCCESS) - goto msg_failure; - client->message->rcode = dns_result_torcode(result); - - ns_client_send(client); - return; - - msg_failure: - isc_log_write(ns_g_lctx, NS_LOGCATEGORY_UPDATE, NS_LOGMODULE_UPDATE, - ISC_LOG_ERROR, - "could not create update response message: %s", - isc_result_totext(msg_result)); - ns_client_next(client, msg_result); -} - -void -ns_update_start(ns_client_t *client, isc_result_t sigresult) { - dns_message_t *request = client->message; - isc_result_t result; - dns_name_t *zonename; - dns_rdataset_t *zone_rdataset; - dns_zone_t *zone = NULL; - - /* - * Interpret the zone section. - */ - result = dns_message_firstname(request, DNS_SECTION_ZONE); - if (result != ISC_R_SUCCESS) - FAILC(DNS_R_FORMERR, - "update zone section empty"); - - /* - * The zone section must contain exactly one "question", and - * it must be of type SOA. - */ - zonename = NULL; - dns_message_currentname(request, DNS_SECTION_ZONE, &zonename); - zone_rdataset = ISC_LIST_HEAD(zonename->list); - if (zone_rdataset->type != dns_rdatatype_soa) - FAILC(DNS_R_FORMERR, - "update zone section contains non-SOA"); - if (ISC_LIST_NEXT(zone_rdataset, link) != NULL) - FAILC(DNS_R_FORMERR, - "update zone section contains multiple RRs"); - - /* The zone section must have exactly one name. */ - result = dns_message_nextname(request, DNS_SECTION_ZONE); - if (result != ISC_R_NOMORE) - FAILC(DNS_R_FORMERR, - "update zone section contains multiple RRs"); - - result = dns_zt_find(client->view->zonetable, zonename, 0, NULL, - &zone); - if (result != ISC_R_SUCCESS) - FAILC(DNS_R_NOTAUTH, - "not authoritative for update zone"); - - switch(dns_zone_gettype(zone)) { - case dns_zone_master: - /* - * We can now fail due to a bad signature as we now know - * that we are the master. - */ - if (sigresult != ISC_R_SUCCESS) - FAIL(sigresult); - CHECK(send_update_event(client, zone)); - break; - case dns_zone_slave: - CHECK(checkupdateacl(client, dns_zone_getforwardacl(zone), - "update forwarding", zonename, ISC_TRUE)); - CHECK(send_forward_event(client, zone)); - break; - default: - FAILC(DNS_R_NOTAUTH, - "not authoritative for update zone"); - } - return; - - failure: - /* - * We failed without having sent an update event to the zone. - * We are still in the client task context, so we can - * simply give an error response without switching tasks. - */ - respond(client, result); - if (zone != NULL) - dns_zone_detach(&zone); -} - -/*% - * DS records are not allowed to exist without corresponding NS records, - * draft-ietf-dnsext-delegation-signer-11.txt, 2.2 Protocol Change, - * "DS RRsets MUST NOT appear at non-delegation points or at a zone's apex". - */ - -static isc_result_t -remove_orphaned_ds(dns_db_t *db, dns_dbversion_t *newver, dns_diff_t *diff) { - isc_result_t result; - isc_boolean_t ns_exists, ds_exists; - dns_difftuple_t *t; - - for (t = ISC_LIST_HEAD(diff->tuples); - t != NULL; - t = ISC_LIST_NEXT(t, link)) { - if (t->op != DNS_DIFFOP_ADD || - t->rdata.type != dns_rdatatype_ns) - continue; - CHECK(rrset_exists(db, newver, &t->name, dns_rdatatype_ns, 0, - &ns_exists)); - if (ns_exists) - continue; - CHECK(rrset_exists(db, newver, &t->name, dns_rdatatype_ds, 0, - &ds_exists)); - if (!ds_exists) - continue; - CHECK(delete_if(true_p, db, newver, &t->name, - dns_rdatatype_ds, 0, NULL, diff)); - } - return (ISC_R_SUCCESS); - - failure: - return (result); -} - -/* - * This implements the post load integrity checks for mx records. - */ -static isc_result_t -check_mx(ns_client_t *client, dns_zone_t *zone, - dns_db_t *db, dns_dbversion_t *newver, dns_diff_t *diff) -{ - char tmp[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:123.123.123.123.")]; - char ownerbuf[DNS_NAME_FORMATSIZE]; - char namebuf[DNS_NAME_FORMATSIZE]; - char altbuf[DNS_NAME_FORMATSIZE]; - dns_difftuple_t *t; - dns_fixedname_t fixed; - dns_name_t *foundname; - dns_rdata_mx_t mx; - dns_rdata_t rdata; - isc_boolean_t ok = ISC_TRUE; - isc_boolean_t isaddress; - isc_result_t result; - struct in6_addr addr6; - struct in_addr addr; - unsigned int options; - - dns_fixedname_init(&fixed); - foundname = dns_fixedname_name(&fixed); - dns_rdata_init(&rdata); - options = dns_zone_getoptions(zone); - - for (t = ISC_LIST_HEAD(diff->tuples); - t != NULL; - t = ISC_LIST_NEXT(t, link)) { - if (t->op != DNS_DIFFOP_ADD || - t->rdata.type != dns_rdatatype_mx) - continue; - - result = dns_rdata_tostruct(&t->rdata, &mx, NULL); - RUNTIME_CHECK(result == ISC_R_SUCCESS); - /* - * Check if we will error out if we attempt to reload the - * zone. - */ - dns_name_format(&mx.mx, namebuf, sizeof(namebuf)); - dns_name_format(&t->name, ownerbuf, sizeof(ownerbuf)); - isaddress = ISC_FALSE; - if ((options & DNS_RDATA_CHECKMX) != 0 && - strlcpy(tmp, namebuf, sizeof(tmp)) < sizeof(tmp)) { - if (tmp[strlen(tmp) - 1] == '.') - tmp[strlen(tmp) - 1] = '\0'; - if (inet_aton(tmp, &addr) == 1 || - inet_pton(AF_INET6, tmp, &addr6) == 1) - isaddress = ISC_TRUE; - } - - if (isaddress && (options & DNS_RDATA_CHECKMXFAIL) != 0) { - update_log(client, zone, ISC_LOG_ERROR, - "%s/MX: '%s': %s", - ownerbuf, namebuf, - dns_result_totext(DNS_R_MXISADDRESS)); - ok = ISC_FALSE; - } else if (isaddress) { - update_log(client, zone, ISC_LOG_WARNING, - "%s/MX: warning: '%s': %s", - ownerbuf, namebuf, - dns_result_totext(DNS_R_MXISADDRESS)); - } - - /* - * Check zone integrity checks. - */ - if ((options & DNS_ZONEOPT_CHECKINTEGRITY) == 0) - continue; - result = dns_db_find(db, &mx.mx, newver, dns_rdatatype_a, - 0, 0, NULL, foundname, NULL, NULL); - if (result == ISC_R_SUCCESS) - continue; - - if (result == DNS_R_NXRRSET) { - result = dns_db_find(db, &mx.mx, newver, - dns_rdatatype_aaaa, - 0, 0, NULL, foundname, - NULL, NULL); - if (result == ISC_R_SUCCESS) - continue; - } - - if (result == DNS_R_NXRRSET || result == DNS_R_NXDOMAIN) { - update_log(client, zone, ISC_LOG_ERROR, - "%s/MX '%s' has no address records " - "(A or AAAA)", ownerbuf, namebuf); - ok = ISC_FALSE; - } else if (result == DNS_R_CNAME) { - update_log(client, zone, ISC_LOG_ERROR, - "%s/MX '%s' is a CNAME (illegal)", - ownerbuf, namebuf); - ok = ISC_FALSE; - } else if (result == DNS_R_DNAME) { - dns_name_format(foundname, altbuf, sizeof altbuf); - update_log(client, zone, ISC_LOG_ERROR, - "%s/MX '%s' is below a DNAME '%s' (illegal)", - ownerbuf, namebuf, altbuf); - ok = ISC_FALSE; - } - } - return (ok ? ISC_R_SUCCESS : DNS_R_REFUSED); -} - -static void -update_action(isc_task_t *task, isc_event_t *event) { - update_event_t *uev = (update_event_t *) event; - dns_zone_t *zone = uev->zone; - ns_client_t *client = (ns_client_t *)event->ev_arg; - - isc_result_t result; - dns_db_t *db = NULL; - dns_dbversion_t *oldver = NULL; - dns_dbversion_t *ver = NULL; - dns_diff_t diff; /* Pending updates. */ - dns_diff_t temp; /* Pending RR existence assertions. */ - isc_boolean_t soa_serial_changed = ISC_FALSE; - isc_mem_t *mctx = client->mctx; - dns_rdatatype_t covers; - dns_message_t *request = client->message; - dns_rdataclass_t zoneclass; - dns_name_t *zonename; - dns_ssutable_t *ssutable = NULL; - dns_fixedname_t tmpnamefixed; - dns_name_t *tmpname = NULL; - unsigned int options; - - INSIST(event->ev_type == DNS_EVENT_UPDATE); - - dns_diff_init(mctx, &diff); - dns_diff_init(mctx, &temp); - - CHECK(dns_zone_getdb(zone, &db)); - zonename = dns_db_origin(db); - zoneclass = dns_db_class(db); - dns_zone_getssutable(zone, &ssutable); - dns_db_currentversion(db, &oldver); - CHECK(dns_db_newversion(db, &ver)); - - /* - * Check prerequisites. - */ - - for (result = dns_message_firstname(request, DNS_SECTION_PREREQUISITE); - result == ISC_R_SUCCESS; - result = dns_message_nextname(request, DNS_SECTION_PREREQUISITE)) - { - dns_name_t *name = NULL; - dns_rdata_t rdata = DNS_RDATA_INIT; - dns_ttl_t ttl; - dns_rdataclass_t update_class; - isc_boolean_t flag; - - get_current_rr(request, DNS_SECTION_PREREQUISITE, zoneclass, - &name, &rdata, &covers, &ttl, &update_class); - - if (ttl != 0) - FAILC(DNS_R_FORMERR, "prerequisite TTL is not zero"); - - if (! dns_name_issubdomain(name, zonename)) - FAILN(DNS_R_NOTZONE, name, - "prerequisite name is out of zone"); - - if (update_class == dns_rdataclass_any) { - if (rdata.length != 0) - FAILC(DNS_R_FORMERR, - "class ANY prerequisite " - "RDATA is not empty"); - if (rdata.type == dns_rdatatype_any) { - CHECK(name_exists(db, ver, name, &flag)); - if (! flag) { - FAILN(DNS_R_NXDOMAIN, name, - "'name in use' prerequisite " - "not satisfied"); - } - } else { - CHECK(rrset_exists(db, ver, name, - rdata.type, covers, &flag)); - if (! flag) { - /* RRset does not exist. */ - FAILNT(DNS_R_NXRRSET, name, rdata.type, - "'rrset exists (value independent)' " - "prerequisite not satisfied"); - } - } - } else if (update_class == dns_rdataclass_none) { - if (rdata.length != 0) - FAILC(DNS_R_FORMERR, - "class NONE prerequisite " - "RDATA is not empty"); - if (rdata.type == dns_rdatatype_any) { - CHECK(name_exists(db, ver, name, &flag)); - if (flag) { - FAILN(DNS_R_YXDOMAIN, name, - "'name not in use' prerequisite " - "not satisfied"); - } - } else { - CHECK(rrset_exists(db, ver, name, - rdata.type, covers, &flag)); - if (flag) { - /* RRset exists. */ - FAILNT(DNS_R_YXRRSET, name, rdata.type, - "'rrset does not exist' " - "prerequisite not satisfied"); - } - } - } else if (update_class == zoneclass) { - /* "temp<rr.name, rr.type> += rr;" */ - result = temp_append(&temp, name, &rdata); - if (result != ISC_R_SUCCESS) { - UNEXPECTED_ERROR(__FILE__, __LINE__, - "temp entry creation failed: %s", - dns_result_totext(result)); - FAIL(ISC_R_UNEXPECTED); - } - } else { - FAILC(DNS_R_FORMERR, "malformed prerequisite"); - } - } - if (result != ISC_R_NOMORE) - FAIL(result); - - - /* - * Perform the final check of the "rrset exists (value dependent)" - * prerequisites. - */ - if (ISC_LIST_HEAD(temp.tuples) != NULL) { - dns_rdatatype_t type; - - /* - * Sort the prerequisite records by owner name, - * type, and rdata. - */ - result = dns_diff_sort(&temp, temp_order); - if (result != ISC_R_SUCCESS) - FAILC(result, "'RRset exists (value dependent)' " - "prerequisite not satisfied"); - - dns_fixedname_init(&tmpnamefixed); - tmpname = dns_fixedname_name(&tmpnamefixed); - result = temp_check(mctx, &temp, db, ver, tmpname, &type); - if (result != ISC_R_SUCCESS) - FAILNT(result, tmpname, type, - "'RRset exists (value dependent)' " - "prerequisite not satisfied"); - } - - update_log(client, zone, LOGLEVEL_DEBUG, - "prerequisites are OK"); - - /* - * Check Requestor's Permissions. It seems a bit silly to do this - * only after prerequisite testing, but that is what RFC2136 says. - */ - result = ISC_R_SUCCESS; - if (ssutable == NULL) - CHECK(checkupdateacl(client, dns_zone_getupdateacl(zone), - "update", zonename, ISC_FALSE)); - else if (client->signer == NULL) - CHECK(checkupdateacl(client, NULL, "update", zonename, - ISC_FALSE)); - - if (dns_zone_getupdatedisabled(zone)) - FAILC(DNS_R_REFUSED, "dynamic update temporarily disabled"); - - /* - * Perform the Update Section Prescan. - */ - - for (result = dns_message_firstname(request, DNS_SECTION_UPDATE); - result == ISC_R_SUCCESS; - result = dns_message_nextname(request, DNS_SECTION_UPDATE)) - { - dns_name_t *name = NULL; - dns_rdata_t rdata = DNS_RDATA_INIT; - dns_ttl_t ttl; - dns_rdataclass_t update_class; - get_current_rr(request, DNS_SECTION_UPDATE, zoneclass, - &name, &rdata, &covers, &ttl, &update_class); - - if (! dns_name_issubdomain(name, zonename)) - FAILC(DNS_R_NOTZONE, - "update RR is outside zone"); - if (update_class == zoneclass) { - /* - * Check for meta-RRs. The RFC2136 pseudocode says - * check for ANY|AXFR|MAILA|MAILB, but the text adds - * "or any other QUERY metatype" - */ - if (dns_rdatatype_ismeta(rdata.type)) { - FAILC(DNS_R_FORMERR, - "meta-RR in update"); - } - result = dns_zone_checknames(zone, name, &rdata); - if (result != ISC_R_SUCCESS) - FAIL(DNS_R_REFUSED); - } else if (update_class == dns_rdataclass_any) { - if (ttl != 0 || rdata.length != 0 || - (dns_rdatatype_ismeta(rdata.type) && - rdata.type != dns_rdatatype_any)) - FAILC(DNS_R_FORMERR, - "meta-RR in update"); - } else if (update_class == dns_rdataclass_none) { - if (ttl != 0 || - dns_rdatatype_ismeta(rdata.type)) - FAILC(DNS_R_FORMERR, - "meta-RR in update"); - } else { - update_log(client, zone, ISC_LOG_WARNING, - "update RR has incorrect class %d", - update_class); - FAIL(DNS_R_FORMERR); - } - /* - * draft-ietf-dnsind-simple-secure-update-01 says - * "Unlike traditional dynamic update, the client - * is forbidden from updating NSEC records." - */ - if (dns_db_issecure(db)) { - if (rdata.type == dns_rdatatype_nsec) { - FAILC(DNS_R_REFUSED, - "explicit NSEC updates are not allowed " - "in secure zones"); - } - else if (rdata.type == dns_rdatatype_rrsig) { - FAILC(DNS_R_REFUSED, - "explicit RRSIG updates are currently not " - "supported in secure zones"); - } - } - - if (ssutable != NULL && client->signer != NULL) { - if (rdata.type != dns_rdatatype_any) { - if (!dns_ssutable_checkrules(ssutable, - client->signer, - name, rdata.type)) - FAILC(DNS_R_REFUSED, - "rejected by secure update"); - } - else { - if (!ssu_checkall(db, ver, name, ssutable, - client->signer)) - FAILC(DNS_R_REFUSED, - "rejected by secure update"); - } - } - } - if (result != ISC_R_NOMORE) - FAIL(result); - - update_log(client, zone, LOGLEVEL_DEBUG, - "update section prescan OK"); - - /* - * Process the Update Section. - */ - - options = dns_zone_getoptions(zone); - for (result = dns_message_firstname(request, DNS_SECTION_UPDATE); - result == ISC_R_SUCCESS; - result = dns_message_nextname(request, DNS_SECTION_UPDATE)) - { - dns_name_t *name = NULL; - dns_rdata_t rdata = DNS_RDATA_INIT; - dns_ttl_t ttl; - dns_rdataclass_t update_class; - isc_boolean_t flag; - - get_current_rr(request, DNS_SECTION_UPDATE, zoneclass, - &name, &rdata, &covers, &ttl, &update_class); - - if (update_class == zoneclass) { - - /* - * RFC1123 doesn't allow MF and MD in master zones. */ - if (rdata.type == dns_rdatatype_md || - rdata.type == dns_rdatatype_mf) { - char typebuf[DNS_RDATATYPE_FORMATSIZE]; - - dns_rdatatype_format(rdata.type, typebuf, - sizeof(typebuf)); - update_log(client, zone, LOGLEVEL_PROTOCOL, - "attempt to add %s ignored", - typebuf); - continue; - } - if (rdata.type == dns_rdatatype_ns && - dns_name_iswildcard(name)) { - update_log(client, zone, - LOGLEVEL_PROTOCOL, - "attempt to add wildcard NS record" - "ignored"); - continue; - } - if (rdata.type == dns_rdatatype_cname) { - CHECK(cname_incompatible_rrset_exists(db, ver, - name, - &flag)); - if (flag) { - update_log(client, zone, - LOGLEVEL_PROTOCOL, - "attempt to add CNAME " - "alongside non-CNAME " - "ignored"); - continue; - } - } else { - CHECK(rrset_exists(db, ver, name, - dns_rdatatype_cname, 0, - &flag)); - if (flag && - ! dns_rdatatype_isdnssec(rdata.type)) - { - update_log(client, zone, - LOGLEVEL_PROTOCOL, - "attempt to add non-CNAME " - "alongside CNAME ignored"); - continue; - } - } - if (rdata.type == dns_rdatatype_soa) { - isc_boolean_t ok; - CHECK(rrset_exists(db, ver, name, - dns_rdatatype_soa, 0, - &flag)); - if (! flag) { - update_log(client, zone, - LOGLEVEL_PROTOCOL, - "attempt to create 2nd " - "SOA ignored"); - continue; - } - CHECK(check_soa_increment(db, ver, &rdata, - &ok)); - if (! ok) { - update_log(client, zone, - LOGLEVEL_PROTOCOL, - "SOA update failed to " - "increment serial, " - "ignoring it"); - continue; - } - soa_serial_changed = ISC_TRUE; - } - if ((options & DNS_ZONEOPT_CHECKWILDCARD) != 0 && - dns_name_internalwildcard(name)) { - char namestr[DNS_NAME_FORMATSIZE]; - dns_name_format(name, namestr, - sizeof(namestr)); - update_log(client, zone, LOGLEVEL_PROTOCOL, - "warning: ownername '%s' contains " - "a non-terminal wildcard", namestr); - } - - if (isc_log_wouldlog(ns_g_lctx, LOGLEVEL_PROTOCOL)) { - char namestr[DNS_NAME_FORMATSIZE]; - char typestr[DNS_RDATATYPE_FORMATSIZE]; - dns_name_format(name, namestr, - sizeof(namestr)); - dns_rdatatype_format(rdata.type, typestr, - sizeof(typestr)); - update_log(client, zone, - LOGLEVEL_PROTOCOL, - "adding an RR at '%s' %s", - namestr, typestr); - } - - /* Prepare the affected RRset for the addition. */ - { - add_rr_prepare_ctx_t ctx; - ctx.db = db; - ctx.ver = ver; - ctx.diff = &diff; - ctx.name = name; - ctx.update_rr = &rdata; - ctx.update_rr_ttl = ttl; - ctx.ignore_add = ISC_FALSE; - dns_diff_init(mctx, &ctx.del_diff); - dns_diff_init(mctx, &ctx.add_diff); - CHECK(foreach_rr(db, ver, name, rdata.type, - covers, add_rr_prepare_action, - &ctx)); - - if (ctx.ignore_add) { - dns_diff_clear(&ctx.del_diff); - dns_diff_clear(&ctx.add_diff); - } else { - CHECK(do_diff(&ctx.del_diff, db, ver, &diff)); - CHECK(do_diff(&ctx.add_diff, db, ver, &diff)); - CHECK(update_one_rr(db, ver, &diff, - DNS_DIFFOP_ADD, - name, ttl, &rdata)); - } - } - } else if (update_class == dns_rdataclass_any) { - if (rdata.type == dns_rdatatype_any) { - if (isc_log_wouldlog(ns_g_lctx, - LOGLEVEL_PROTOCOL)) - { - char namestr[DNS_NAME_FORMATSIZE]; - dns_name_format(name, namestr, - sizeof(namestr)); - update_log(client, zone, - LOGLEVEL_PROTOCOL, - "delete all rrsets from " - "name '%s'", namestr); - } - if (dns_name_equal(name, zonename)) { - CHECK(delete_if(type_not_soa_nor_ns_p, - db, ver, name, - dns_rdatatype_any, 0, - &rdata, &diff)); - } else { - CHECK(delete_if(type_not_dnssec, - db, ver, name, - dns_rdatatype_any, 0, - &rdata, &diff)); - } - } else if (dns_name_equal(name, zonename) && - (rdata.type == dns_rdatatype_soa || - rdata.type == dns_rdatatype_ns)) { - update_log(client, zone, - LOGLEVEL_PROTOCOL, - "attempt to delete all SOA " - "or NS records ignored"); - continue; - } else { - if (isc_log_wouldlog(ns_g_lctx, - LOGLEVEL_PROTOCOL)) - { - char namestr[DNS_NAME_FORMATSIZE]; - char typestr[DNS_RDATATYPE_FORMATSIZE]; - dns_name_format(name, namestr, - sizeof(namestr)); - dns_rdatatype_format(rdata.type, - typestr, - sizeof(typestr)); - update_log(client, zone, - LOGLEVEL_PROTOCOL, - "deleting rrset at '%s' %s", - namestr, typestr); - } - CHECK(delete_if(true_p, db, ver, name, - rdata.type, covers, &rdata, - &diff)); - } - } else if (update_class == dns_rdataclass_none) { - /* - * The (name == zonename) condition appears in - * RFC2136 3.4.2.4 but is missing from the pseudocode. - */ - if (dns_name_equal(name, zonename)) { - if (rdata.type == dns_rdatatype_soa) { - update_log(client, zone, - LOGLEVEL_PROTOCOL, - "attempt to delete SOA " - "ignored"); - continue; - } - if (rdata.type == dns_rdatatype_ns) { - int count; - CHECK(rr_count(db, ver, name, - dns_rdatatype_ns, - 0, &count)); - if (count == 1) { - update_log(client, zone, - LOGLEVEL_PROTOCOL, - "attempt to " - "delete last " - "NS ignored"); - continue; - } - } - } - update_log(client, zone, - LOGLEVEL_PROTOCOL, - "deleting an RR"); - CHECK(delete_if(rr_equal_p, db, ver, name, - rdata.type, covers, &rdata, &diff)); - } - } - if (result != ISC_R_NOMORE) - FAIL(result); - - /* - * If any changes were made, increment the SOA serial number, - * update RRSIGs and NSECs (if zone is secure), and write the update - * to the journal. - */ - if (! ISC_LIST_EMPTY(diff.tuples)) { - char *journalfile; - dns_journal_t *journal; - - /* - * Increment the SOA serial, but only if it was not - * changed as a result of an update operation. - */ - if (! soa_serial_changed) { - CHECK(increment_soa_serial(db, ver, &diff, mctx)); - } - - CHECK(check_mx(client, zone, db, ver, &diff)); - - CHECK(remove_orphaned_ds(db, ver, &diff)); - - if (dns_db_issecure(db)) { - result = update_signatures(client, zone, db, oldver, - ver, &diff, - dns_zone_getsigvalidityinterval(zone)); - if (result != ISC_R_SUCCESS) { - update_log(client, zone, - ISC_LOG_ERROR, - "RRSIG/NSEC update failed: %s", - isc_result_totext(result)); - goto failure; - } - } - - journalfile = dns_zone_getjournal(zone); - if (journalfile != NULL) { - update_log(client, zone, LOGLEVEL_DEBUG, - "writing journal %s", journalfile); - - journal = NULL; - result = dns_journal_open(mctx, journalfile, - ISC_TRUE, &journal); - if (result != ISC_R_SUCCESS) - FAILS(result, "journal open failed"); - - result = dns_journal_write_transaction(journal, &diff); - if (result != ISC_R_SUCCESS) { - dns_journal_destroy(&journal); - FAILS(result, "journal write failed"); - } - - dns_journal_destroy(&journal); - } - - /* - * XXXRTH Just a note that this committing code will have - * to change to handle databases that need two-phase - * commit, but this isn't a priority. - */ - update_log(client, zone, LOGLEVEL_DEBUG, - "committing update transaction"); - dns_db_closeversion(db, &ver, ISC_TRUE); - - /* - * Mark the zone as dirty so that it will be written to disk. - */ - dns_zone_markdirty(zone); - - /* - * Notify slaves of the change we just made. - */ - dns_zone_notify(zone); - } else { - update_log(client, zone, LOGLEVEL_DEBUG, "redundant request"); - dns_db_closeversion(db, &ver, ISC_TRUE); - } - result = ISC_R_SUCCESS; - goto common; - - failure: - /* - * The reason for failure should have been logged at this point. - */ - if (ver != NULL) { - update_log(client, zone, LOGLEVEL_DEBUG, - "rolling back"); - dns_db_closeversion(db, &ver, ISC_FALSE); - } - - common: - dns_diff_clear(&temp); - dns_diff_clear(&diff); - - if (oldver != NULL) - dns_db_closeversion(db, &oldver, ISC_FALSE); - - if (db != NULL) - dns_db_detach(&db); - - if (ssutable != NULL) - dns_ssutable_detach(&ssutable); - - if (zone != NULL) - dns_zone_detach(&zone); - - isc_task_detach(&task); - uev->result = result; - uev->ev_type = DNS_EVENT_UPDATEDONE; - uev->ev_action = updatedone_action; - isc_task_send(client->task, &event); - INSIST(event == NULL); -} - -static void -updatedone_action(isc_task_t *task, isc_event_t *event) { - update_event_t *uev = (update_event_t *) event; - ns_client_t *client = (ns_client_t *) event->ev_arg; - - UNUSED(task); - - INSIST(event->ev_type == DNS_EVENT_UPDATEDONE); - INSIST(task == client->task); - - INSIST(client->nupdates > 0); - client->nupdates--; - respond(client, uev->result); - isc_event_free(&event); - ns_client_detach(&client); -} - -/*% - * Update forwarding support. - */ - -static void -forward_fail(isc_task_t *task, isc_event_t *event) { - ns_client_t *client = (ns_client_t *)event->ev_arg; - - UNUSED(task); - - INSIST(client->nupdates > 0); - client->nupdates--; - respond(client, DNS_R_SERVFAIL); - isc_event_free(&event); - ns_client_detach(&client); -} - - -static void -forward_callback(void *arg, isc_result_t result, dns_message_t *answer) { - update_event_t *uev = arg; - ns_client_t *client = uev->ev_arg; - - if (result != ISC_R_SUCCESS) { - INSIST(answer == NULL); - uev->ev_type = DNS_EVENT_UPDATEDONE; - uev->ev_action = forward_fail; - } else { - uev->ev_type = DNS_EVENT_UPDATEDONE; - uev->ev_action = forward_done; - uev->answer = answer; - } - isc_task_send(client->task, ISC_EVENT_PTR(&uev)); -} - -static void -forward_done(isc_task_t *task, isc_event_t *event) { - update_event_t *uev = (update_event_t *) event; - ns_client_t *client = (ns_client_t *)event->ev_arg; - - UNUSED(task); - - INSIST(client->nupdates > 0); - client->nupdates--; - ns_client_sendraw(client, uev->answer); - dns_message_destroy(&uev->answer); - isc_event_free(&event); - ns_client_detach(&client); -} - -static void -forward_action(isc_task_t *task, isc_event_t *event) { - update_event_t *uev = (update_event_t *) event; - dns_zone_t *zone = uev->zone; - ns_client_t *client = (ns_client_t *)event->ev_arg; - isc_result_t result; - - result = dns_zone_forwardupdate(zone, client->message, - forward_callback, event); - if (result != ISC_R_SUCCESS) { - uev->ev_type = DNS_EVENT_UPDATEDONE; - uev->ev_action = forward_fail; - isc_task_send(client->task, &event); - } - dns_zone_detach(&zone); - isc_task_detach(&task); -} - -static isc_result_t -send_forward_event(ns_client_t *client, dns_zone_t *zone) { - isc_result_t result = ISC_R_SUCCESS; - update_event_t *event = NULL; - isc_task_t *zonetask = NULL; - ns_client_t *evclient; - - event = (update_event_t *) - isc_event_allocate(client->mctx, client, DNS_EVENT_UPDATE, - forward_action, NULL, sizeof(*event)); - if (event == NULL) - FAIL(ISC_R_NOMEMORY); - event->zone = zone; - event->result = ISC_R_SUCCESS; - - evclient = NULL; - ns_client_attach(client, &evclient); - INSIST(client->nupdates == 0); - client->nupdates++; - event->ev_arg = evclient; - - dns_zone_gettask(zone, &zonetask); - isc_task_send(zonetask, ISC_EVENT_PTR(&event)); - - failure: - if (event != NULL) - isc_event_free(ISC_EVENT_PTR(&event)); - return (result); -} |
