diff options
Diffstat (limited to 'contrib/bind/bin/named/ns_notify.c')
| -rw-r--r-- | contrib/bind/bin/named/ns_notify.c | 379 |
1 files changed, 379 insertions, 0 deletions
diff --git a/contrib/bind/bin/named/ns_notify.c b/contrib/bind/bin/named/ns_notify.c new file mode 100644 index 0000000..ac03732e --- /dev/null +++ b/contrib/bind/bin/named/ns_notify.c @@ -0,0 +1,379 @@ +#if !defined(lint) && !defined(SABER) +static const char rcsid[] = "$Id: ns_notify.c,v 8.4 1999/10/15 19:49:04 vixie Exp $"; +#endif /* not lint */ + +/* + * Copyright (c) 1994-1999 by Internet Software Consortium. + * + * Permission to use, copy, modify, and 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 INTERNET SOFTWARE CONSORTIUM DISCLAIMS + * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE + * CONSORTIUM 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. + */ + +/* Import. */ + +#include "port_before.h" + +#include <sys/types.h> +#include <sys/param.h> +#include <sys/socket.h> +#include <sys/file.h> +#include <sys/un.h> + +#include <netinet/in.h> +#include <arpa/nameser.h> +#include <arpa/inet.h> + +#include <errno.h> +#include <limits.h> +#include <resolv.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <syslog.h> +#include <time.h> + +#include <isc/eventlib.h> +#include <isc/logging.h> +#include <isc/memcluster.h> + +#include <isc/dst.h> + +#include "port_after.h" + +#include "named.h" + +#ifdef BIND_NOTIFY + +/* Types. */ + +struct notify { + char * name; + ns_class class; + ns_type type; + evTimerID timer; + LINK(struct notify) link; +}; + +/* Forward. */ + +static void sysnotify(const char *, ns_class, ns_type); +static void sysnotify_slaves(const char *, const char *, + ns_class, ns_type, int, int *, int *); +static void sysnotify_ns(const char *, const char *, + ns_class, ns_type, int, int *, int *); +static void free_notify(struct notify *); +static void notify_timer(evContext, void *, + struct timespec, struct timespec); + +/* Local. */ + +static LIST(struct notify) pending_notifies; + +/* Public. */ + +/* + * ns_notify(dname, class, type) + * call this when a zone has changed and its slaves need to know. + */ +void +ns_notify(const char *dname, ns_class class, ns_type type) { + static const char no_room[] = "%s failed, cannot notify for zone %s"; + int delay, max_delay; + struct zoneinfo *zp; + struct notify *ni; + + zp = find_auth_zone(dname, class); + if (zp == NULL) { + ns_warning(ns_log_notify, + "no zone found for notify (\"%s\" %s %s)", + (dname && *dname) ? dname : ".", + p_class(class), p_type(type)); + return; + } + if ((zp->z_flags & Z_NOTIFY) != 0) { + ns_info(ns_log_notify, + "suppressing duplicate notify (\"%s\" %s %s)", + (dname && *dname) ? dname : ".", + p_class(class), p_type(type)); + return; + } + ni = memget(sizeof *ni); + if (ni == NULL) { + ns_info(ns_log_notify, no_room, "memget", dname); + return; + } + ni->name = savestr(dname, 0); + if (ni->name == NULL) { + memput(ni, sizeof *ni); + ni = NULL; + ns_info(ns_log_notify, no_room, "memget", dname); + return; + } + ni->class = class; + ni->type = type; + evInitID(&ni->timer); + + /* Delay notification for from five seconds up to fifteen minutes. */ + max_delay = MIN(nzones/5, 895); + max_delay = MAX(max_delay, 25); + delay = 5 + (rand() % max_delay); + if (evSetTimer(ev, notify_timer, ni, + evAddTime(evNowTime(), evConsTime(delay, 0)), + evConsTime(0, 0), &ni->timer) < 0) { + ns_error(ns_log_notify, "evSetTimer() failed: %s", + strerror(errno)); + freestr(ni->name); + memput(ni, sizeof *ni); + return; + } + + zp->z_flags |= Z_NOTIFY; + APPEND(pending_notifies, ni, link); + ns_debug(ns_log_notify, 3, + "ns_notify(%s, %s, %s): ni %p, zp %p, delay %d", + (dname && *dname) ? dname : ".", + p_class(class), p_type(type), + ni, zp, delay); +} + +/* + * ns_unnotify() + * call this when all pending notifies are now considered junque. + */ +void +ns_unnotify(void) { + while (!EMPTY(pending_notifies)) { + struct notify *ni = HEAD(pending_notifies); + + INSIST(LINKED(ni, link)); + UNLINK(pending_notifies, ni, link); + free_notify(ni); + } +} + +/* Private. */ + +/* + * sysnotify(dname, class, type) + * cause a NOTIFY request to be sysquery()'d to each slave server + * of the zone that "dname" is within. + */ +static void +sysnotify(const char *dname, ns_class class, ns_type type) { + const char *zname, *fname; + int nns, na, i; + struct zoneinfo *zp; + struct in_addr *also_addr; + + ns_debug(ns_log_notify, 3, "sysnotify(%s, %s, %s)", + dname, p_class(class), p_type(type)); + zp = find_auth_zone(dname, class); + if (zp == NULL) { + ns_warning(ns_log_notify, "sysnotify: can't find \"%s\" (%s)", + dname, p_class(class)); + return; + } + if (ns_samename(dname, zp->z_origin) != 1) { + ns_warning(ns_log_notify, "sysnotify: not auth for zone %s", + dname); + return; + } + if (zp->z_notify == znotify_no || + (zp->z_notify == znotify_use_default && + NS_OPTION_P(OPTION_NONOTIFY))) + return; + if (zp->z_type != z_master && zp->z_type != z_slave) { + ns_warning(ns_log_notify, "sysnotify: %s not master or slave", + dname); + return; + } + zname = zp->z_origin; + nns = na = 0; + if (zp->z_type == z_master) + sysnotify_slaves(dname, zname, class, type, + zp - zones, &nns, &na); + + /* + * Handle any global or zone-specific also-notify clauses + */ + if (zp->z_notify_count != 0) { + /* zone-specific also notify */ + + ns_debug(ns_log_notify, 3, "zone notify ns = %d", + zp->z_notify_count); + + also_addr = zp->z_also_notify; + for (i = 0; i < zp->z_notify_count; i++) { + ns_debug(ns_log_notify, 4, "notifying %s", + inet_ntoa(*also_addr)); + sysquery(dname, class, type, also_addr, 1, ns_port, + NS_NOTIFY_OP); + also_addr++; + } + nns += zp->z_notify_count; + na += zp->z_notify_count; + } else if (server_options->notify_count != 0) { + ns_debug(ns_log_notify, 4, "global notify ns = %d", + server_options->notify_count); + also_addr = server_options->also_notify; + for (i = 0; i < server_options->notify_count; i++) { + ns_debug(ns_log_notify, 3, "notifying %s", + inet_ntoa(*also_addr)); + sysquery(dname, class, type, also_addr, + 1, ns_port, ns_o_notify); + also_addr++; + } + nns += server_options->notify_count; + na += server_options->notify_count; + } + + if (nns != 0 || na != 0) + ns_info(ns_log_notify, + "Sent NOTIFY for \"%s %s %s\" (%s); %d NS, %d A", + dname, p_class(class), p_type(type), zname, nns, na); +} + +static void +sysnotify_slaves(const char *dname, const char *zname, + ns_class class, ns_type type, + int zn, int *nns, int *na) +{ + const char *mname, *fname; + struct hashbuf *htp; + struct namebuf *np; + struct databuf *dp; + + /* + * Master. + */ + htp = hashtab; + np = nlookup(zname, &htp, &fname, 0); + if (np == NULL) { + ns_warning(ns_log_notify, + "sysnotify: found name \"%s\" but not zone", + dname); + return; + } + mname = NULL; + for (dp = np->n_data; dp != NULL; dp = dp->d_next) { + if (dp->d_zone == DB_Z_CACHE || !match(dp, class, ns_t_soa)) + continue; + if (dp->d_type == ns_t_sig) + continue; + if (mname) { + ns_notice(ns_log_notify, + "multiple SOA's for zone \"%s\"?", + zname); + return; + } + mname = (char *) dp->d_data; + } + if (mname == NULL) { + ns_notice(ns_log_notify, "no SOA found for zone \"%s\"", + zname); + return; + } + for (dp = np->n_data; dp != NULL; dp = dp->d_next) { + if (dp->d_zone == DB_Z_CACHE || !match(dp, class, ns_t_ns)) + continue; + if (dp->d_type == ns_t_sig) + continue; + if (ns_samename((char*)dp->d_data, mname) == 1) + continue; + sysnotify_ns(dname, (char *)dp->d_data, class, type, + zn, nns, na); + } +} + +static void +sysnotify_ns(const char *dname, const char *aname, + ns_class class, ns_type type, + int zn, int *nns, int *na) +{ + struct databuf *adp; + struct namebuf *anp; + const char *fname; + struct in_addr nss[NSMAX]; + struct hashbuf *htp; + int is_us, nsc; + + htp = hashtab; + anp = nlookup(aname, &htp, &fname, 0); + nsc = 0; + is_us = 0; + if (anp != NULL) + for (adp = anp->n_data; adp; adp = adp->d_next) { + struct in_addr ina; + + if (!match(adp, class, T_A)) + continue; + if (adp->d_type == ns_t_sig) + continue; + ina = ina_get(adp->d_data); + if (aIsUs(ina)) { + is_us = 1; + continue; + } + if (nsc < NSMAX) + nss[nsc++] = ina; + } /*next A*/ + if (nsc == 0) { + if (!is_us) { + struct qinfo *qp; + + qp = sysquery(aname, class, ns_t_a, 0, 0, ns_port, + ns_o_query); + if (qp != NULL) + qp->q_notifyzone = zn; + } + return; + } + sysquery(dname, class, type, nss, nsc, ns_port, ns_o_notify); + (*nns)++; + *na += nsc; +} + +static void +free_notify(struct notify *ni) { + struct zoneinfo *zp; + + INSIST(!LINKED(ni, link)); + zp = find_auth_zone(ni->name, ni->class); + if (zp != NULL) { + INSIST((zp->z_flags & Z_NOTIFY) != 0); + zp->z_flags &= ~Z_NOTIFY; + } + if (evTestID(ni->timer)) { + evClearTimer(ev, ni->timer); + evInitID(&ni->timer); + } + freestr(ni->name); + memput(ni, sizeof *ni); +} + +static void +notify_timer(evContext ctx, void *uap, + struct timespec due, + struct timespec inter) +{ + struct notify *ni = uap; + + INSIST(evTestID(ni->timer)); + evInitID(&ni->timer); + INSIST(LINKED(ni, link)); + UNLINK(pending_notifies, ni, link); + sysnotify(ni->name, ni->class, ni->type); + free_notify(ni); +} + +#endif /*BIND_NOTIFY*/ |
