436 lines
10 KiB
C
436 lines
10 KiB
C
#if !defined(lint) && !defined(SABER)
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static const char rcsid[] = "$Id: ns_notify.c,v 8.14 2001/04/01 18:38:36 vixie Exp $";
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#endif /* not lint */
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/*
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* Copyright (c) 1994-2000 by Internet Software Consortium.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
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* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
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* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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*/
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/* Import. */
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#include "port_before.h"
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/file.h>
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#include <sys/un.h>
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#include <netinet/in.h>
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#include <arpa/nameser.h>
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#include <arpa/inet.h>
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#include <errno.h>
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#include <limits.h>
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#include <resolv.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <time.h>
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#include <isc/eventlib.h>
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#include <isc/logging.h>
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#include <isc/memcluster.h>
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#include <isc/dst.h>
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#include "port_after.h"
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#include "named.h"
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#ifdef BIND_NOTIFY
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/* Types. */
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struct notify {
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char * name;
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ns_class class;
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ns_type type;
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evTimerID timer;
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LINK(struct notify) link;
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};
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/* Forward. */
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static void sysnotify(const char *, ns_class, ns_type);
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static void sysnotify_slaves(const char *, const char *,
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ns_class, ns_type, int, int *, int *);
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static void sysnotify_ns(const char *, const char *,
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ns_class, ns_type, int, int *, int *);
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static void free_notify(struct notify *);
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static void notify_timer(evContext, void *,
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struct timespec, struct timespec);
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/* Local. */
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static LIST(struct notify) pending_notifies;
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static LIST(struct notify) loading_notifies;
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/* Public. */
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/*
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* ns_notify(dname, class, type)
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* call this when a zone has changed and its slaves need to know.
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*/
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void
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ns_notify(const char *dname, ns_class class, ns_type type) {
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static const char no_room[] = "%s failed, cannot notify for zone %s";
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int delay, max_delay;
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struct zoneinfo *zp;
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struct notify *ni;
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zp = find_auth_zone(dname, class);
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if (zp == NULL) {
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ns_warning(ns_log_notify,
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"no zone found for notify (\"%s\" %s %s)",
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(dname && *dname) ? dname : ".",
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p_class(class), p_type(type));
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return;
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}
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if (ns_samename(dname, zp->z_origin) != 1) {
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ns_warning(ns_log_notify,
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"notify not called with top of zone (\"%s\" %s %s)",
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(dname && *dname) ? dname : ".",
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p_class(class), p_type(type));
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return;
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}
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if ((zp->z_flags & Z_NOTIFY) != 0) {
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ns_info(ns_log_notify,
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"suppressing duplicate notify (\"%s\" %s %s)",
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(dname && *dname) ? dname : ".",
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p_class(class), p_type(type));
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return;
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}
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ni = memget(sizeof *ni);
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if (ni == NULL) {
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ns_info(ns_log_notify, no_room, "memget", dname);
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return;
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}
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ni->name = savestr(dname, 0);
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if (ni->name == NULL) {
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memput(ni, sizeof *ni);
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ni = NULL;
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ns_info(ns_log_notify, no_room, "memget", dname);
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return;
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}
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ni->class = class;
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ni->type = type;
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INIT_LINK(ni, link);
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evInitID(&ni->timer);
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if (loading != 0) {
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APPEND(loading_notifies, ni, link);
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return;
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}
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/* Delay notification for from five seconds up to fifteen minutes. */
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max_delay = MIN(nzones, 895);
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max_delay = MAX(max_delay, 25);
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delay = 5 + (rand() % max_delay);
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if (evSetTimer(ev, notify_timer, ni,
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evAddTime(evNowTime(), evConsTime(delay, 0)),
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evConsTime(0, 0), &ni->timer) < 0) {
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ns_error(ns_log_notify, "evSetTimer() failed: %s",
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strerror(errno));
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freestr(ni->name);
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memput(ni, sizeof *ni);
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return;
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}
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zp->z_flags |= Z_NOTIFY;
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APPEND(pending_notifies, ni, link);
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ns_debug(ns_log_notify, 3,
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"ns_notify(%s, %s, %s): ni %p, zp %p, delay %d",
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(dname && *dname) ? dname : ".",
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p_class(class), p_type(type),
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ni, zp, delay);
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}
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void
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notify_afterload() {
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struct notify *ni;
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INSIST(loading == 0);
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while ((ni = HEAD(loading_notifies)) != NULL) {
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UNLINK(loading_notifies, ni, link);
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ns_notify(ni->name, ni->class, ni->type);
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freestr(ni->name);
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memput(ni, sizeof *ni);
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}
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}
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/*
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* ns_unnotify()
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* call this when all pending notifies are now considered junque.
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*/
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void
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ns_unnotify(void) {
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while (!EMPTY(pending_notifies)) {
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struct notify *ni = HEAD(pending_notifies);
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INSIST(LINKED(ni, link));
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UNLINK(pending_notifies, ni, link);
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free_notify(ni);
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}
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}
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/*
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* ns_stopnotify(const char *dname, ns_class class)
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* stop notifies for this particular zone.
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*/
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void
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ns_stopnotify(const char *dname, ns_class class) {
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struct notify *ni;
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ni = HEAD(pending_notifies);
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while (ni != NULL &&
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(ni->class != class || ns_samename(ni->name, dname) != 1))
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ni = NEXT(ni, link);
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if (ni != NULL) {
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UNLINK(pending_notifies, ni, link);
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free_notify(ni);
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}
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}
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/* Private. */
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/*
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* sysnotify(dname, class, type)
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* cause a NOTIFY request to be sysquery()'d to each slave server
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* of the zone that "dname" is within.
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*/
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static void
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sysnotify(const char *dname, ns_class class, ns_type type) {
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const char *zname;
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u_int32_t zserial;
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int nns, na, i;
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struct zoneinfo *zp;
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struct in_addr *also_addr;
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ns_debug(ns_log_notify, 3, "sysnotify(%s, %s, %s)",
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dname, p_class(class), p_type(type));
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zp = find_auth_zone(dname, class);
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if (zp == NULL) {
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ns_warning(ns_log_notify, "sysnotify: can't find \"%s\" (%s)",
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dname, p_class(class));
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return;
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}
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if (ns_samename(dname, zp->z_origin) != 1) {
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ns_warning(ns_log_notify, "sysnotify: not auth for zone %s",
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dname);
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return;
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}
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if (zp->z_notify == znotify_no ||
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(zp->z_notify == znotify_use_default &&
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NS_OPTION_P(OPTION_NONOTIFY)))
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return;
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if (zp->z_type != z_master && zp->z_type != z_slave) {
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ns_warning(ns_log_notify, "sysnotify: %s not master or slave",
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dname);
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return;
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}
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zname = zp->z_origin;
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zserial = zp->z_serial;
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nns = na = 0;
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sysnotify_slaves(dname, zname, class, type, zp - zones, &nns, &na);
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/*
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* Handle any global or zone-specific also-notify clauses
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*/
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if (zp->z_notify_count != 0) {
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/* zone-specific also notify */
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ns_debug(ns_log_notify, 3, "zone notify ns = %d",
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zp->z_notify_count);
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also_addr = zp->z_also_notify;
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for (i = 0; i < zp->z_notify_count; i++) {
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ns_debug(ns_log_notify, 4, "notifying %s",
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inet_ntoa(*also_addr));
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sysquery(dname, class, type, also_addr, 1, ns_port,
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NS_NOTIFY_OP);
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also_addr++;
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}
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nns += zp->z_notify_count;
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na += zp->z_notify_count;
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} else if (server_options->notify_count != 0) {
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ns_debug(ns_log_notify, 4, "global notify ns = %d",
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server_options->notify_count);
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also_addr = server_options->also_notify;
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for (i = 0; i < server_options->notify_count; i++) {
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ns_debug(ns_log_notify, 3, "notifying %s",
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inet_ntoa(*also_addr));
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sysquery(dname, class, type, also_addr,
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1, ns_port, ns_o_notify);
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also_addr++;
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}
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nns += server_options->notify_count;
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na += server_options->notify_count;
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}
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if (nns != 0 || na != 0)
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ns_info(ns_log_notify,
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"Sent NOTIFY for \"%s %s %s %u\" (%s); %d NS, %d A",
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dname, p_class(class), p_type(type), zserial, zname, nns, na);
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}
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static void
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sysnotify_slaves(const char *dname, const char *zname,
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ns_class class, ns_type type,
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int zn, int *nns, int *na)
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{
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const char *mname, *fname;
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struct hashbuf *htp;
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struct namebuf *np;
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struct databuf *dp;
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/*
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* Master.
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*/
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htp = hashtab;
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np = nlookup(zname, &htp, &fname, 0);
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if (np == NULL) {
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ns_warning(ns_log_notify,
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"sysnotify: found name \"%s\" but not zone",
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dname);
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return;
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}
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mname = NULL;
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for (dp = np->n_data; dp != NULL; dp = dp->d_next) {
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if (dp->d_zone == DB_Z_CACHE || !match(dp, class, ns_t_soa))
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continue;
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if (dp->d_type == ns_t_sig)
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continue;
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if (mname) {
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ns_notice(ns_log_notify,
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"multiple SOA's for zone \"%s\"?",
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zname);
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return;
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}
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mname = (char *) dp->d_data;
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}
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if (mname == NULL) {
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ns_notice(ns_log_notify, "no SOA found for zone \"%s\"",
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zname);
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return;
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}
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for (dp = np->n_data; dp != NULL; dp = dp->d_next) {
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if (dp->d_zone == DB_Z_CACHE || !match(dp, class, ns_t_ns))
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continue;
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if (dp->d_type == ns_t_sig)
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continue;
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if (ns_samename((char*)dp->d_data, mname) == 1)
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continue;
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sysnotify_ns(dname, (char *)dp->d_data, class, type,
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zn, nns, na);
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}
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}
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static void
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sysnotify_ns(const char *dname, const char *aname,
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ns_class class, ns_type type,
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int zn, int *nns, int *na)
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{
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struct databuf *adp;
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struct namebuf *anp;
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const char *fname;
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struct in_addr nss[NSMAX];
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struct hashbuf *htp;
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int is_us, nsc;
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int cname = 0;
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htp = hashtab;
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anp = nlookup(aname, &htp, &fname, 0);
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nsc = 0;
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is_us = 0;
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if (anp != NULL)
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for (adp = anp->n_data; adp; adp = adp->d_next) {
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struct in_addr ina;
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if (match(adp, class, T_CNAME)) {
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cname = 1;
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ns_error(ns_log_notify,
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"NS '%s' for '%s/%s' is a CNAME",
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*aname ? aname : ".",
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*dname ? dname : ".",
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p_class(class));
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break;
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}
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if (!match(adp, class, T_A))
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continue;
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if (adp->d_type == ns_t_sig)
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continue;
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ina = ina_get(adp->d_data);
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if (aIsUs(ina)) {
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is_us = 1;
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continue;
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}
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if (nsc < NSMAX)
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nss[nsc++] = ina;
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} /*next A*/
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if (nsc == 0) {
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if (!is_us && !cname && !NS_OPTION_P(OPTION_NOFETCHGLUE)) {
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struct qinfo *qp;
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qp = sysquery(aname, class, ns_t_a, 0, 0, ns_port,
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ns_o_query);
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if (qp != NULL)
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qp->q_notifyzone = zn;
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}
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return;
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}
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sysquery(dname, class, type, nss, nsc, ns_port, ns_o_notify);
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(*nns)++;
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*na += nsc;
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}
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static void
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free_notify(struct notify *ni) {
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struct zoneinfo *zp;
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INSIST(!LINKED(ni, link));
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zp = find_auth_zone(ni->name, ni->class);
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if (zp != NULL && ns_samename(ni->name, zp->z_origin) == 1) {
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INSIST((zp->z_flags & Z_NOTIFY) != 0);
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zp->z_flags &= ~Z_NOTIFY;
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}
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if (evTestID(ni->timer)) {
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evClearTimer(ev, ni->timer);
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evInitID(&ni->timer);
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}
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freestr(ni->name);
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memput(ni, sizeof *ni);
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}
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static void
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notify_timer(evContext ctx, void *uap,
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struct timespec due,
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struct timespec inter)
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{
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struct notify *ni = uap;
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INSIST(evTestID(ni->timer));
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evInitID(&ni->timer);
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INSIST(LINKED(ni, link));
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UNLINK(pending_notifies, ni, link);
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sysnotify(ni->name, ni->class, ni->type);
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free_notify(ni);
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}
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#endif /*BIND_NOTIFY*/
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