/* $NetBSD: ns_maint.c,v 1.4 2001/05/17 22:59:40 itojun Exp $ */ #if !defined(lint) && !defined(SABER) static const char sccsid[] = "@(#)ns_maint.c 4.39 (Berkeley) 3/2/91"; static const char rcsid[] = "Id: ns_maint.c,v 8.122 2001/03/01 06:26:31 marka Exp"; #endif /* not lint */ /* * Copyright (c) 1986, 1988 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /* * Portions Copyright (c) 1993 by Digital Equipment Corporation. * * 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, and that * the name of Digital Equipment Corporation not be used in advertising or * publicity pertaining to distribution of the document or software without * specific, written prior permission. * * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT * CORPORATION 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. */ /* * Portions Copyright (c) 1996-2000 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. */ /* * Portions Copyright (c) 1999 by Check Point Software Technologies, Inc. * * 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, and that * the name of Check Point Software Technologies Incorporated not be used * in advertising or publicity pertaining to distribution of the document * or software without specific, written prior permission. * * THE SOFTWARE IS PROVIDED "AS IS" AND CHECK POINT SOFTWARE TECHNOLOGIES * INCORPORATED DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. * IN NO EVENT SHALL CHECK POINT SOFTWARE TECHNOLOGIES INCORPRATED * 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. */ #include "port_before.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "port_after.h" #include "named.h" static int nxfers(struct zoneinfo *), bottom_of_zone(struct databuf *, int); static void startxfer(struct zoneinfo *), abortxfer(struct zoneinfo *), tryxfer(void), purge_z_2(struct hashbuf *, int); static int purge_nonglue_2(const char *, struct hashbuf *, int, int, int); #ifndef HAVE_SPAWNXFER static pid_t spawnxfer(char **, struct zoneinfo *); #endif /* State of all running zone transfers */ static struct { pid_t xfer_pid; int xfer_state; /* see below */ WAIT_T xfer_status; struct in_addr xfer_addr; } xferstatus[MAX_XFERS_RUNNING]; #define XFER_IDLE 0 #define XFER_RUNNING 1 #define XFER_DONE 2 /* * Perform routine zone maintenance. */ void zone_maint(struct zoneinfo *zp) { gettime(&tt); ns_debug(ns_log_maint, 1, "zone_maint('%s'); now %lu", zp->z_origin[0] == '\0' ? "." : zp->z_origin, (u_long)tt.tv_sec); #ifdef DEBUG if (debug >= 2) printzoneinfo((zp - zones), ns_log_maint, 2); #endif switch (zp->z_type) { case Z_SECONDARY: /*FALLTHROUGH*/ #ifdef STUBS case Z_STUB: #endif if (zp->z_serial != 0 && ((zp->z_lastupdate+zp->z_expire) < (u_int32_t)tt.tv_sec)) { if ((zp->z_flags & Z_NOTIFY) != 0) ns_stopnotify(zp->z_origin, zp->z_class); /* calls purge_zone */ do_reload(zp->z_origin, zp->z_type, zp->z_class, 0); /* reset zone state */ if (!haveComplained((u_long)zp, (u_long)stale)) { ns_notice(ns_log_default, "%s zone \"%s\" expired", zoneTypeString(zp->z_type), zp->z_origin); } zp->z_flags &= ~Z_AUTH; zp->z_flags |= Z_EXPIRED; zp->z_refresh = INIT_REFRESH; zp->z_retry = INIT_REFRESH; zp->z_serial = 0; } if ((zp->z_flags & (Z_NEED_RELOAD|Z_NEED_XFER|Z_QSERIAL)) != 0) { ns_retrytime(zp, tt.tv_sec); break; } if (zp->z_flags & Z_XFER_RUNNING) { abortxfer(zp); /* * Check again in 30 seconds in case the first * abort doesn't work. */ if (zp->z_time != 0 && zp->z_time <= tt.tv_sec) zp->z_time = tt.tv_sec + 30; break; } /* * If we don't have the zone loaded or dialup is off * or we attempted a qserial_query before and the queue was * full attempt to verify / load the zone. */ if ((zp->z_serial == 0) || (zp->z_flags & Z_NEED_QSERIAL) || (zp->z_dialup == zdialup_no) || (zp->z_dialup == zdialup_use_default && NS_OPTION_P(OPTION_NODIALUP))) qserial_query(zp); else { ns_info(ns_log_default, "Suppressed qserial_query(%s)", *(zp->z_origin) ? zp->z_origin : "."); ns_refreshtime(zp, tt.tv_sec); } break; #ifdef BIND_UPDATE case Z_PRIMARY: if ((zp->z_flags & Z_DYNAMIC) == 0) break; if (tt.tv_sec >= zp->z_soaincrtime && zp->z_soaincrintvl > 0 && zp->z_flags & Z_NEED_SOAUPDATE) { if (incr_serial(zp) < 0) { /* Try again later. */ ns_error(ns_log_maint, "error updating serial number for %s from %d", zp->z_origin, zp->z_serial); zp->z_soaincrtime = 0; (void)schedule_soa_update(zp, 0); } } if (tt.tv_sec >= zp->z_dumptime && zp->z_dumpintvl > 0 && zp->z_flags & Z_NEED_DUMP) { if (zonedump(zp, ISNOTIXFR) < 0) { /* Try again later. */ ns_error(ns_log_maint, "zone dump for '%s' failed, rescheduling", zp->z_origin); zp->z_dumptime = 0; (void)schedule_dump(zp); } } if (zp->z_maintain_ixfr_base) ixfr_log_maint(zp); break; #endif /* BIND_UPDATE */ default: break; } /* * It is essential that we never try to set a timer in the past * or for now because doing so could cause an infinite loop. */ INSIST(zp->z_time == 0 || zp->z_time > tt.tv_sec); sched_zone_maint(zp); } static void do_zone_maint(evContext ctx, void *uap, struct timespec due, struct timespec inter) { ztimer_info zti = uap; struct zoneinfo *zp; INSIST(zti != NULL); ns_debug(ns_log_maint, 1, "do_zone_maint for zone %s (class %s)", zti->name, p_class(zti->class)); zp = find_zone(zti->name, zti->class); if (zp == NULL) { ns_error(ns_log_maint, "do_zone_maint: %s zone '%s' (class %s) is not authoritative", zoneTypeString(zti->type), zti->name, p_class(zti->class)); return; } if (zp->z_type != zti->type) { ns_error(ns_log_maint, "do_zone_maint: %s zone '%s' (class %s) has changed its type", zoneTypeString(zti->type), zti->name, p_class(zti->class)); return; } free_zone_timerinfo(zp); zp->z_flags &= ~Z_TIMER_SET; zone_maint(zp); } /* * Figure out the next maintenance time for the zone and set a timer. */ void sched_zone_maint(struct zoneinfo *zp) { time_t next_maint = (time_t)0; ztimer_info zti; if (zp->z_time != 0) next_maint = zp->z_time; #ifdef BIND_UPDATE if (zp->z_type == z_master && (zp->z_flags & Z_DYNAMIC) != 0) { if (zp->z_soaincrintvl > 0 && (next_maint == 0 || next_maint > zp->z_soaincrtime)) next_maint = zp->z_soaincrtime; if (zp->z_dumpintvl > 0 && (next_maint == 0 || next_maint > zp->z_dumptime)) next_maint = zp->z_dumptime; } #endif if (next_maint != 0) { if (next_maint < tt.tv_sec) next_maint = tt.tv_sec; if (zp->z_flags & Z_TIMER_SET) { if (next_maint == zp->z_nextmaint) { ns_debug(ns_log_maint, 1, "no schedule change for zone '%s'", zp->z_origin[0] == '\0' ? "." : zp->z_origin); return; } if (evResetTimer(ev, zp->z_timer, do_zone_maint, zp->z_timerinfo, evConsTime(next_maint, 0), evConsTime(0, 0)) < 0) { ns_error(ns_log_maint, "evChangeTimer failed in sched_zone_maint for zone '%s': %s", zp->z_origin[0] == '\0' ? "." : zp->z_origin, strerror(errno)); return; } } else { zti = (ztimer_info)memget(sizeof *zti); if (zti == NULL) ns_panic(ns_log_maint, 1, "memget failed in sched_zone_maint"); zti->name = savestr(zp->z_origin, 1); zti->class = zp->z_class; zti->type = zp->z_type; if (evSetTimer(ev, do_zone_maint, zti, evConsTime(next_maint, 0), evConsTime(0, 0), &zp->z_timer) < 0) { ns_error(ns_log_maint, "evSetTimer failed in sched_zone_maint for zone '%s': %s", zp->z_origin[0] == '\0' ? "." : zp->z_origin, strerror(errno)); return; } zp->z_flags |= Z_TIMER_SET; zp->z_timerinfo = zti; } ns_debug(ns_log_maint, 1, "next maintenance for zone '%s' in %lu sec", zp->z_origin[0] == '\0' ? "." : zp->z_origin, (u_long)(next_maint - tt.tv_sec)); } else { if (zp->z_flags & Z_TIMER_SET) { free_zone_timerinfo(zp); if (evClearTimer(ev, zp->z_timer) < 0) ns_error(ns_log_maint, "evClearTimer failed in sched_zone_maint for zone '%s': %s", zp->z_origin[0] == '\0' ? "." : zp->z_origin, strerror(errno)); zp->z_flags &= ~Z_TIMER_SET; } ns_debug(ns_log_maint, 1, "no scheduled maintenance for zone '%s'", zp->z_origin[0] == '\0' ? "." : zp->z_origin); } zp->z_nextmaint = next_maint; } void ns_cleancache(evContext ctx, void *uap, struct timespec due, struct timespec inter) { int deleted; gettime(&tt); INSIST(uap == NULL); deleted = clean_cache(hashtab, 0); ns_info(ns_log_maint, "Cleaned cache of %d RRset%s", deleted, (deleted==1) ? "" : "s"); } void ns_heartbeat(evContext ctx, void *uap, struct timespec due, struct timespec inter) { struct zoneinfo *zp; gettime(&tt); INSIST(uap == NULL); for (zp = zones; zp < &zones[nzones]; zp++) { enum zonetype zt = zp->z_type; if ((zt == z_nil) || (zp->z_dialup == zdialup_no) || (zp->z_dialup == zdialup_use_default && NS_OPTION_P(OPTION_NODIALUP))) continue; /* * Perform the refresh query that was suppressed. */ if ((zt == z_slave || zt == z_stub) && (zp->z_flags & (Z_NEED_RELOAD|Z_NEED_XFER|Z_QSERIAL|Z_XFER_RUNNING) ) == 0) { ns_info(ns_log_default, "Heartbeat: qserial \"%s\"", *(zp->z_origin) ? zp->z_origin : "."); qserial_query(zp); } #ifdef BIND_NOTIFY /* * Trigger a refresh query while the link is up by * sending a notify. */ if (((zp->z_notify == znotify_yes) || ((zp->z_notify == znotify_use_default) && !NS_OPTION_P(OPTION_NONOTIFY))) && (zt == z_master || zt == z_slave) && !loading && ((zp->z_flags & Z_AUTH) != 0)) ns_notify(zp->z_origin, zp->z_class, ns_t_soa); #endif } } /* * Mark a zone "up to date" after named-xfer tells us this or we * discover it through the qserial_*() logic. * The caller is responsible for calling sched_zone_maint(zp). */ static void markUpToDate(struct zoneinfo *zp) { struct stat f_time; zp->z_flags &= ~Z_SYSLOGGED; zp->z_lastupdate = tt.tv_sec; ns_refreshtime(zp, tt.tv_sec); /* * Restore Z_AUTH in case expired, * but only if there were no errors * in the zone file. */ if ((zp->z_flags & Z_DB_BAD) == 0) { zp->z_flags |= Z_AUTH; zp->z_flags &= ~Z_EXPIRED; } if (zp->z_source) { struct timeval t[2]; t[0] = tt; t[1] = tt; (void) utimes(zp->z_source, t); } /* we use "stat" to set zp->z_ftime instead of just setting it to tt.tv_sec in order to avoid any possible rounding problems in utimes(). */ if (stat(zp->z_source, &f_time) != -1) zp->z_ftime = f_time.st_mtime; /* XXX log if stat fails? */ } void qserial_retrytime(struct zoneinfo *zp, time_t timebase) { zp->z_time = timebase + 5 + (rand() % 25); } /* * Query for the serial number of a zone, so that we can check to see if * we need to transfer it. If there are too many outstanding serial * number queries, we'll try again later. * The caller is responsible for calling sched_zone_maint(zp). */ void qserial_query(struct zoneinfo *zp) { struct qinfo *qp; ns_debug(ns_log_default, 1, "qserial_query(%s)", zp->z_origin); if (qserials_running >= server_options->serial_queries) { qserial_retrytime(zp, tt.tv_sec); zp->z_flags |= Z_NEED_QSERIAL; return; } qp = sysquery(zp->z_origin, zp->z_class, T_SOA, zp->z_addr, zp->z_addrcnt, ntohs(zp->z_port) ? zp->z_port : ns_port, QUERY); if (qp == NULL) { ns_debug(ns_log_default, 1, "qserial_query(%s): sysquery FAILED", zp->z_origin); /* XXX - this is bad, we should do something */ qserial_retrytime(zp, tt.tv_sec); zp->z_flags |= Z_NEED_QSERIAL; return; } qp->q_flags |= Q_ZSERIAL; qp->q_zquery = zp; zp->z_flags |= Z_QSERIAL; zp->z_flags &= ~Z_NEED_QSERIAL; zp->z_xaddrcnt = 0; ns_refreshtime(zp, tt.tv_sec); qserials_running++; ns_debug(ns_log_default, 1, "qserial_query(%s) QUEUED", zp->z_origin); } static int qserv_compare(const void *a, const void *b) { const struct qserv *qs1 = a, *qs2 = b; u_int32_t s1 = qs1->serial, s2 = qs2->serial; /* Note that we sort the "best" serial numbers to the front. */ if (s1 == s2) return (0); if (s1 == 0) return (-1); if (s2 == 0) return (1); if (!SEQ_GT(s1, s2)) return (1); assert(SEQ_GT(s1, s2)); return (-1); } void qserial_answer(struct qinfo *qp) { struct zoneinfo *zp = qp->q_zquery; struct qserv *qs = NULL; u_int32_t serial = 0; int n, cnt = 0; /* Take this query out of the global quotas. */ zp->z_flags &= ~Z_QSERIAL; qp->q_flags &= ~Q_ZSERIAL; /* keeps us from being called twice */ qserials_running--; /* Find best serial among those returned. */ for (n = 0; n < qp->q_naddr; n++) { qs = &qp->q_addr[n]; ns_debug(ns_log_default, 1, "qserial_answer(%s): [%s] -> %lu", zp->z_origin, inet_ntoa(qs->ns_addr.sin_addr), (unsigned long)qs->serial); /* Don't consider serials which weren't set by a response. */ if (qs->serial == 0) continue; /* Count valid answers. */ cnt++; /* Remove from consideration serials which aren't "better." */ if (zp->z_serial != 0 && !SEQ_GT(qs->serial, zp->z_serial)) { if (serial == 0 && qs->serial == zp->z_serial) serial = qs->serial; if (qs->serial != zp->z_serial) ns_notice(ns_log_xfer_in, "Zone \"%s\" (%s) SOA serial# (%lu) rcvd from [%s] is < ours (%lu)%s", zp->z_origin, p_class(zp->z_class), (u_long) qs->serial, inet_ntoa(qs->ns_addr.sin_addr), (u_long) zp->z_serial, qp->q_naddr!=1 ? ": skipping" : ""); qs->serial = 0; continue; } if (serial == 0 || SEQ_GT(qs->serial, serial)) serial = qs->serial; } /* If we have an existing serial number, then sort by "better." */ if (zp->z_serial != 0) { qsort(qp->q_addr, qp->q_naddr, sizeof(struct qserv), qserv_compare); for (n = 0; n < qp->q_naddr; n++) { qs = &qp->q_addr[n]; ns_debug(ns_log_default, 1, "qserial_answer after sort: [%s] -> %lu", inet_ntoa(qs->ns_addr.sin_addr), (unsigned long)qs->serial); } } /* Now see about kicking off an inbound transfer. */ if (serial == 0) { /* An error occurred, or the all queries timed out. */ if (qp->q_naddr != cnt) ns_info(ns_log_xfer_in, "Err/TO getting serial# for \"%s\"", zp->z_origin); addxfer(zp); } else if (zp->z_serial == 0 || SEQ_GT(serial, zp->z_serial)) { ns_debug(ns_log_xfer_in, 1, "qserial_answer: zone is out of date"); /* Use all servers whose serials are better than ours. */ zp->z_xaddrcnt = 0; for (n = 0; n < qp->q_naddr; n++) { qs = &qp->q_addr[n]; if (qs->serial != 0) zp->z_xaddr[zp->z_xaddrcnt++] = qs->ns_addr.sin_addr; } addxfer(zp); } else if (zp->z_serial == serial) { ns_debug(ns_log_xfer_in, 1, "qserial_answer: zone serial is still OK"); markUpToDate(zp); sched_zone_maint(zp); } } /* * Writes TSIG key info for an address to a file, optionally opening it first. * Returns: * -1: Error. * 0: No action taken. * 1: Tsig info successfully written. */ static int write_tsig_info(struct in_addr addr, char *name, int *fd) { server_info si; DST_KEY *dst_key; int tsig_fd = *fd; char tsig_str[1024], secret_buf64[172]; u_char secret_buf[128]; int secret_len, len; si = find_server(addr); if (si == NULL || si->key_list == NULL || si->key_list->first == NULL) return(0); dst_key = si->key_list->first->key; if (tsig_fd == -1) { *fd = tsig_fd = mkstemp(name); if (tsig_fd < 0) { ns_warning(ns_log_default, "write_tsig_info: mkstemp(%s) for TSIG info failed", name); return(-1); } (void) fchown(tsig_fd, user_id, group_id); } memset(secret_buf, 0, sizeof(secret_buf)); secret_len = dst_key_to_buffer(dst_key, secret_buf, sizeof(secret_buf)); if (secret_len == 0) return (-1); len = b64_ntop(secret_buf, secret_len, secret_buf64, sizeof(secret_buf64)); if (len == -1) return (-1); /* We need snprintf! */ if (strlen(dst_key->dk_key_name) + len + sizeof("XXX.XXX.XXX.XXX"), sizeof("123") + 5 > sizeof(tsig_str)) return (-1); sprintf(tsig_str, "%s\n%s\n%d\n%s\n", inet_ntoa(addr), dst_key->dk_key_name, dst_key->dk_alg, secret_buf64); len = strlen(tsig_str); if (write(tsig_fd, tsig_str, strlen(tsig_str)) != len) return (-1); return (1); } /* * Returns number of tsigs written or -1. */ static int write_tsigs(struct zoneinfo *zp, char *tsig_name) { struct in_addr a; int tsig_ret; int tsig_fd = -1; int cnt; int records = 0; for (cnt = 0; cnt < zp->z_xaddrcnt; cnt++) { a = zp->z_xaddr[cnt]; if (aIsUs(a) && ns_port == zp->z_port) continue; tsig_ret = write_tsig_info(a, tsig_name, &tsig_fd); switch (tsig_ret) { case -1: goto error; case 0: break; case 1: records++; break; } } if (tsig_fd != -1) close(tsig_fd); return (records); error: if (tsig_fd != -1) { unlink(tsig_name); close(tsig_fd); } return (-1); } #ifdef BIND_IXFR static int supports_ixfr(struct zoneinfo *zp) { int cnt = 0; for (cnt = 0; cnt < zp->z_xaddrcnt; cnt++) { struct in_addr a; server_info si; a = zp->z_xaddr[cnt]; if (aIsUs(a) && ns_port == zp->z_port) continue; si = find_server(a); if (si != NULL && (si->flags & SERVER_INFO_SUPPORT_IXFR) != 0) return(1); } return(0); } #endif /* * Start an asynchronous zone transfer for a zone. Depends on current time * being in tt. Caller must do a sched_zone_maint(zp) after we return. */ static void startxfer(struct zoneinfo *zp) { char *argv[NSMAX*2 + 20], argv_ns[NSMAX][MAXDNAME]; int argc = 0, argc_ns = 0, i; pid_t pid; u_int cnt; char debug_str[10]; char serial_str[10]; char port_str[10]; char class_str[10]; char src_str[20]; char tsig_name[MAXPATHLEN+1]; int tsig_ret = 0; ns_debug(ns_log_default, 1, "startxfer() %s", zp->z_origin[0] != '\0' ? zp->z_origin : "."); argv[argc++] = server_options->named_xfer; argv[argc++] = "-z"; argv[argc++] = zp->z_origin; argv[argc++] = "-f"; argv[argc++] = zp->z_source; #ifdef BIND_IXFR if (supports_ixfr(zp) && zp->z_ixfr_tmp != NULL) { argv[argc++] = "-i"; argv[argc++] = zp->z_ixfr_tmp; } #endif if (zp->z_serial != 0) { argv[argc++] = "-s"; sprintf(serial_str, "%u", zp->z_serial); argv[argc++] = serial_str; } if (zp->z_axfr_src.s_addr != 0 || server_options->axfr_src.s_addr != 0) { argv[argc++] = "-x"; argv[argc++] = strcpy(src_str, inet_ntoa( (zp->z_axfr_src.s_addr != 0) ? zp->z_axfr_src : server_options->axfr_src)); } argv[argc++] = "-C"; sprintf(class_str, "%d", zp->z_class); argv[argc++] = class_str; if (zp->z_flags & Z_SYSLOGGED) argv[argc++] = "-q"; argv[argc++] = "-P"; sprintf(port_str, "%d", ntohs(zp->z_port) != 0 ? zp->z_port : ns_port); argv[argc++] = port_str; #ifdef STUBS if (zp->z_type == Z_STUB) argv[argc++] = "-S"; #endif #ifdef DEBUG if (debug) { argv[argc++] = "-d"; sprintf(debug_str, "%d", debug); argv[argc++] = debug_str; argv[argc++] = "-l"; argv[argc++] = _PATH_XFERDDT; if (debug > 5) { argv[argc++] = "-t"; argv[argc++] = _PATH_XFERTRACE; } } #endif if (zp->z_xaddrcnt == 0) { for (zp->z_xaddrcnt = 0; zp->z_xaddrcnt < zp->z_addrcnt; zp->z_xaddrcnt++) zp->z_xaddr[zp->z_xaddrcnt] = zp->z_addr[zp->z_xaddrcnt]; } /* * Store TSIG keys if we have them. */ strcpy(tsig_name, "tsigs.XXXXXX"); tsig_ret = write_tsigs(zp, tsig_name); if (tsig_ret == -1) { ns_error(ns_log_xfer_in, "unable to write tsig info: '%s'", zp->z_origin); return; } if (tsig_ret != 0) { argv[argc++] = "-T"; argv[argc++] = tsig_name; } /* * Copy the server ip addresses into argv, after converting * to ascii and saving the static inet_ntoa result. * Also, send TSIG key info into a file for the child. */ for (cnt = 0; cnt < zp->z_xaddrcnt; cnt++) { struct in_addr a; a = zp->z_xaddr[cnt]; if (aIsUs(a) && ns_port == zp->z_port) { if (!haveComplained((u_long)zp, (u_long)startxfer)) ns_notice(ns_log_default, "attempted to fetch zone %s from self (%s)", zp->z_origin, inet_ntoa(a)); continue; } argv[argc++] = strcpy(argv_ns[argc_ns++], inet_ntoa(a)); #ifdef BIND_IXFR if (zp->z_ixfr_tmp != NULL) { server_info si = find_server(a); if (si != NULL && (si->flags & SERVER_INFO_SUPPORT_IXFR) != 0) argv[argc++] = "ixfr"; else argv[argc++] = "axfr"; } #endif } argv[argc] = NULL; #ifdef DEBUG if (debug >= 1) { char buffer[1024]; char *curr, *last; int len; curr = buffer; last = &buffer[sizeof buffer - 1]; /* leave room for \0 */ for (i = 0; i < argc; i++) { len = strlen(argv[i]); if (curr + len + 1 >= last) { ns_debug(ns_log_xfer_in, 1, "xfer args debug printout truncated"); break; } strncpy(curr, argv[i], len); curr += len; *curr = ' '; curr++; } *curr = '\0'; ns_debug(ns_log_xfer_in, 1, "%s", buffer); } #endif /* DEBUG */ gettime(&tt); for (i = 0; i < MAX_XFERS_RUNNING; i++) if (xferstatus[i].xfer_pid == 0) break; if (i == MAX_XFERS_RUNNING) { ns_warning(ns_log_default, "startxfer: too many xfers running"); zp->z_time = tt.tv_sec + 10; return; } if ((pid = spawnxfer(argv, zp)) == -1) { unlink(tsig_name); return; } xferstatus[i].xfer_state = XFER_RUNNING; xferstatus[i].xfer_pid = pid; /* XXX - small race condition here if we * can't hold signals */ xferstatus[i].xfer_addr = zp->z_xaddr[0]; ns_debug(ns_log_default, 1, "started xfer child %d", pid); zp->z_flags &= ~Z_NEED_XFER; zp->z_flags |= Z_XFER_RUNNING; zp->z_xferpid = pid; xfers_running++; xfers_deferred--; if (zp->z_max_transfer_time_in) zp->z_time = tt.tv_sec + zp->z_max_transfer_time_in; else zp->z_time = tt.tv_sec + server_options->max_transfer_time_in; } const char * zoneTypeString(u_int type) { static char ret[sizeof "(4294967296?)"]; /* 2^32 */ switch (type) { case Z_MASTER: return ("master"); case Z_SLAVE: return ("slave"); #ifdef STUBS case Z_STUB: return ("stub"); #endif case Z_HINT: return ("hint"); case Z_CACHE: return ("cache"); case Z_FORWARD: return ("forward"); default: sprintf(ret, "(%u?)", type); return (ret); } } #ifdef DEBUG void printzoneinfo(int zonenum, int category, int level) { struct timeval tt; struct zoneinfo *zp = &zones[zonenum]; if (debug == 0) return; if (!zp->z_origin) return; gettime(&tt); ns_debug(category, level, "zone %d: %s, class %s, type %s", zonenum, zp->z_origin[0] ? zp->z_origin : ".", p_class(zp->z_class), zoneTypeString(zp->z_type)); if (zp->z_source) ns_debug(category, level, "\tsource %s", zp->z_source); ns_debug(category, level, "\tflags %lx, serial %u, minimum %u", (u_long)zp->z_flags, zp->z_serial, zp->z_minimum); ns_debug(category, level, "\trefresh %u, retry %u, expire %u", zp->z_refresh, zp->z_retry, zp->z_expire); if (zp->z_time) ns_debug(category, level, "\tz_time %lu (now %lu, left: %lu)", zp->z_time, (u_long)tt.tv_sec, (u_long)(zp->z_time - tt.tv_sec)); else ns_debug(category, level, "\tz_time %lu", zp->z_time); #ifdef BIND_UPDATE if (zp->z_type == z_master && (zp->z_flags & Z_DYNAMIC) != 0) { ns_debug(category, level, "\tdumpintvl %lu, soaincrintvl %lu deferupdcnt %lu", (unsigned long)zp->z_dumpintvl, zp->z_soaincrintvl, (unsigned long)zp->z_deferupdcnt); if (zp->z_soaincrtime) ns_debug(category, level, "\tz_soaincrtime %lu (now %lu, left: %lu)", zp->z_soaincrtime, (u_long)tt.tv_sec, (u_long)(zp->z_soaincrtime - tt.tv_sec)); else ns_debug(category, level, "\tz_soaincrtime %lu", zp->z_soaincrtime); if (zp->z_dumptime) ns_debug(category, level, "\tz_dumptime %lu (now %lu, left: %lu)", zp->z_dumptime, (u_long)tt.tv_sec, (u_long)(zp->z_dumptime - tt.tv_sec)); else ns_debug(category, level, "\tz_dumptime %lu", zp->z_dumptime); } #endif } #endif /* DEBUG */ /* * Remove all cached data below dname, class independent. */ void clean_cache_from(char *dname, struct hashbuf *htp) { const char *fname; struct databuf *dp, *pdp; struct namebuf *np; struct hashbuf *phtp = htp; int root_zone = 0; ns_debug(ns_log_default, 1, "clean_cache_from(%s)", dname); if ((np = nlookup(dname, &phtp, &fname, 0)) && dname == fname && !ns_wildcard(NAME(*np))) { for (pdp = NULL, dp = np->n_data; dp != NULL; (void)NULL) { if (dp->d_zone == DB_Z_CACHE) dp = rm_datum(dp, np, pdp, NULL); else { pdp = dp; dp = dp->d_next; } } if (*dname == '\0') root_zone = 1; if (np->n_hash != NULL || root_zone) { struct hashbuf *h; if (root_zone) h = htp; else h = np->n_hash; (void)clean_cache(h, 1); if (h->h_cnt == 0 && !root_zone) { rm_hash(np->n_hash); np->n_hash = NULL; } } if (!root_zone && np->n_hash == NULL && np->n_data == NULL) (void) purge_node(htp, np); } } /* clean_cache(htp, all) * Scan the entire cache looking for expired TTL's on nonauthoritative * data, and remove it. if `all' is true, ignore TTL and rm everything. * notes: * this should be lazy and eventlib driven. * return: * number of deleted RRs (all=1) or RRsets (all=0). */ int clean_cache(struct hashbuf *htp, int all) { struct databuf *dp, *pdp; struct namebuf *np, *pnp, *npn; struct namebuf **npp, **nppend; int deleted = 0; nppend = htp->h_tab + htp->h_size; for (npp = htp->h_tab; npp < nppend; npp++) { for (pnp = NULL, np = *npp; np != NULL; np = npn) { again: for (pdp = NULL, dp = np->n_data; dp != NULL; (void)NULL) { if (all && dp->d_zone == DB_Z_CACHE) { dp = rm_datum(dp, np, pdp, NULL); deleted++; } else if (dp->d_zone == DB_Z_CACHE && stale(dp)) { delete_all(np, dp->d_class, dp->d_type); deleted++; goto again; } else { pdp = dp; dp = dp->d_next; } } /*for(pdp)*/ if (np->n_hash) { /* Call recursively to remove subdomains. */ deleted += clean_cache(np->n_hash, all); /* If now empty, free it */ if (np->n_hash->h_cnt == 0) { rm_hash(np->n_hash); np->n_hash = NULL; } } if (np->n_hash == NULL && np->n_data == NULL) { npn = rm_name(np, npp, pnp); htp->h_cnt--; } else { npn = np->n_next; pnp = np; } } /*for(pnp)*/ } /*for(npp)*/ return (deleted); } /* struct namebuf * * purge_node(htp, np) * Remove entry from cache. * Prerequisites: * Node is empty and has no children. * Paramters: * htp - root of recursive hash table this node is part of. * np - the node to be deleted. * Return: * pointer to parent. */ struct namebuf * purge_node(struct hashbuf *htp, struct namebuf *np) { struct namebuf **npp, **nppend; struct namebuf *npn, *pnp, *nnp, *parent; struct hashbuf *phtp; ns_debug(ns_log_default, 3, "purge_node: cleaning cache"); INSIST(np->n_hash == NULL && np->n_data == NULL); /* Walk parent hashtable looking for ourself. */ parent = np->n_parent; if (parent != NULL) phtp = parent->n_hash; else phtp = htp; if (phtp == NULL) { /* XXX why shouldn't we panic? */ } else { nppend = phtp->h_tab + phtp->h_size; for (npp = phtp->h_tab; npp < nppend; npp++) { for (pnp = NULL, nnp = *npp; nnp != NULL; nnp = npn) { if (nnp == np) { ns_debug(ns_log_default, 3, "purge_node: found ourself"); npn = rm_name(nnp, npp, pnp); phtp->h_cnt--; } else { npn = nnp->n_next; pnp = nnp; } } } } return (parent); } void remove_zone(struct zoneinfo *zp, const char *verb) { #ifdef BIND_UPDATE /* * A dynamic zone might have changed, so we * need to dump it before removing it. */ if ((zp->z_flags & Z_DYNAMIC) != 0 && ((zp->z_flags & Z_NEED_SOAUPDATE) != 0 || (zp->z_flags & Z_NEED_DUMP) != 0)) (void) zonedump(zp, ISNOTIXFR); #endif if ((zp->z_flags & Z_NOTIFY) != 0) ns_stopnotify(zp->z_origin, zp->z_class); if ((zp->z_flags & Z_NEED_XFER) != 0) { zp->z_flags &= ~Z_NEED_XFER; xfers_deferred--; } ns_stopxfrs(zp); do_reload(zp->z_origin, zp->z_type, zp->z_class, 1); ns_notice(ns_log_config, "%s zone \"%s\" (%s) %s", zoneTypeString(zp->z_type), zp->z_origin, p_class(zp->z_class), verb); free_zone_contents(zp, 1); memset(zp, 0, sizeof(*zp)); zp->z_type = z_nil; /* Pedantic; memset() did it. */ INIT_LINK(zp, z_reloadlink); INIT_LINK(zp, z_freelink); free_zone(zp); } int purge_nonglue(const char *dname, struct hashbuf *htp, int class, int log) { const char *fname; struct namebuf *np; struct hashbuf *phtp = htp; int root_zone = 0; int errs = 0; ns_debug(ns_log_default, 1, "purge_zone(%s,%d)", dname, class); if ((np = nlookup(dname, &phtp, &fname, 0)) && dname == fname && !ns_wildcard(NAME(*np))) { if (*dname == '\0') root_zone = 1; if (np->n_hash != NULL || root_zone) { struct hashbuf *h; if (root_zone) h = htp; else h = np->n_hash; errs += purge_nonglue_2(dname, h, class, 0, log); if (h->h_cnt == 0 && !root_zone) { rm_hash(np->n_hash); np->n_hash = NULL; } } } return (errs); } static int valid_glue(struct databuf *dp, char *name, int belowcut) { /* NS records are only valid glue at the zone cut */ if (belowcut && dp->d_type == T_NS) return(0); if (ISVALIDGLUE(dp)) /* T_NS/T_A/T_AAAA/T_A6 */ return (1); if (belowcut) return (0); /* Parent NXT record? */ if (dp->d_type == T_NXT && !ns_samedomain((char*)dp->d_data, name) && ns_samedomain((char*)dp->d_data, zones[dp->d_zone].z_origin)) return (1); /* NOKEY is in parent zone otherwise child zone */ if (dp->d_type == T_KEY && dp->d_size == 4 && (dp->d_data[0] & 0xc3) == 0xc1) return (1); /* NXT & KEY records may be signed */ if (!belowcut && dp->d_type == T_SIG && (SIG_COVERS(dp) == T_NXT || SIG_COVERS(dp) == T_KEY)) return (1); return (0); } static int purge_nonglue_2(const char *dname, struct hashbuf *htp, int class, int belowcut, int log) { struct databuf *dp, *pdp; struct namebuf *np, *pnp, *npn; struct namebuf **npp, **nppend; int errs = 0; int zonecut; char name[MAXDNAME]; nppend = htp->h_tab + htp->h_size; for (npp = htp->h_tab; npp < nppend; npp++) { for (pnp = NULL, np = *npp; np != NULL; np = npn) { if (!bottom_of_zone(np->n_data, class)) { zonecut = belowcut; for (dp = np->n_data; dp != NULL; dp = dp->d_next) { if (match(dp, class, ns_t_ns)) { zonecut = 1; break; } } getname(np, name, sizeof name); for (pdp = NULL, dp = np->n_data; dp != NULL; (void)NULL) { if (dp->d_class == class && zonecut && !valid_glue(dp, name, belowcut)) { if (log) ns_error(ns_log_load, "zone: %s/%s: non-glue record %s bottom of zone: %s/%s", *dname ? dname : ".", p_class(dp->d_class), belowcut ? "below" : "at", *name ? name : ".", p_type(dp->d_type)); dp = rm_datum(dp, np, pdp, NULL); if (log) errs++; } else { pdp = dp; dp = dp->d_next; } } if (np->n_hash) { /* * call recursively to clean * subdomains */ errs += purge_nonglue_2(dname, np->n_hash, class, zonecut || belowcut, log); /* if now empty, free it */ if (np->n_hash->h_cnt == 0) { rm_hash(np->n_hash); np->n_hash = NULL; } } } if (np->n_hash == NULL && np->n_data == NULL) { npn = rm_name(np, npp, pnp); htp->h_cnt--; } else { npn = np->n_next; pnp = np; } } } return (errs); } void purge_zone(const char *dname, struct hashbuf *htp, int class) { const char *fname; struct databuf *dp, *pdp; struct namebuf *np; struct hashbuf *phtp = htp; int root_zone = 0; ns_debug(ns_log_default, 1, "purge_zone(%s,%d)", dname, class); if ((np = nlookup(dname, &phtp, &fname, 0)) && dname == fname && !ns_wildcard(NAME(*np))) { for (pdp = NULL, dp = np->n_data; dp != NULL; (void)NULL) { if (dp->d_class == class) dp = rm_datum(dp, np, pdp, NULL); else { pdp = dp; dp = dp->d_next; } } if (*dname == '\0') root_zone = 1; if (np->n_hash != NULL || root_zone) { struct hashbuf *h; if (root_zone) h = htp; else h = np->n_hash; purge_z_2(h, class); if (h->h_cnt == 0 && !root_zone) { rm_hash(np->n_hash); np->n_hash = NULL; } } if (!root_zone && np->n_hash == NULL && np->n_data == NULL) (void) purge_node(htp, np); } } static void purge_z_2(htp, class) struct hashbuf *htp; int class; { struct databuf *dp, *pdp; struct namebuf *np, *pnp, *npn; struct namebuf **npp, **nppend; nppend = htp->h_tab + htp->h_size; for (npp = htp->h_tab; npp < nppend; npp++) { for (pnp = NULL, np = *npp; np != NULL; np = npn) { if (!bottom_of_zone(np->n_data, class)) { for (pdp = NULL, dp = np->n_data; dp != NULL; (void)NULL) { if (dp->d_class == class) dp = rm_datum(dp, np, pdp, NULL); else { pdp = dp; dp = dp->d_next; } } if (np->n_hash) { /* call recursively to rm subdomains */ purge_z_2(np->n_hash, class); /* if now empty, free it */ if (np->n_hash->h_cnt == 0) { rm_hash(np->n_hash); np->n_hash = NULL; } } } if (np->n_hash == NULL && np->n_data == NULL) { npn = rm_name(np, npp, pnp); htp->h_cnt--; } else { npn = np->n_next; pnp = np; } } } } static int bottom_of_zone(struct databuf *dp, int class) { int ret = 0; for ((void)NULL; dp; dp = dp->d_next) { if (dp->d_class != class) continue; if (dp->d_zone == DB_Z_CACHE) continue; if (dp->d_rcode) /* This should not occur. */ continue; if (dp->d_type != T_SOA) continue; ret = 1; break; } ns_debug(ns_log_default, 3, "bottom_of_zone() == %d", ret); return (ret); } /* * Handle XFER limit for a nameserver. */ static int nxfers(struct zoneinfo *zp) { struct in_addr nsa; int ret; int i; if (zp->z_xaddrcnt != 0) nsa = zp->z_xaddr[0]; /* first ns holds zone's xfer limit */ else if (zp->z_addrcnt != 0) nsa = zp->z_addr[0]; /* first ns holds zone's xfer limit */ else return (-1); ret = 0; for (i = 0; i < MAX_XFERS_RUNNING; i++) if (xferstatus[i].xfer_status == XFER_RUNNING && xferstatus[i].xfer_addr.s_addr == nsa.s_addr) ret++; return (ret); } /* * Abort an xfer that has taken too long. */ static void abortxfer(struct zoneinfo *zp) { if (zp->z_flags & (Z_XFER_GONE|Z_XFER_ABORTED)) { int i; for (i = 0; i < MAX_XFERS_RUNNING; i++) { if (xferstatus[i].xfer_pid == zp->z_xferpid) { xferstatus[i].xfer_pid = 0; xferstatus[i].xfer_state = XFER_IDLE; break; } } if (zp->z_flags & Z_XFER_GONE) ns_warning(ns_log_default, "zone transfer timeout for \"%s\"; pid %lu missing", zp->z_origin, (u_long)zp->z_xferpid); else if (kill(zp->z_xferpid, SIGKILL) == -1) ns_warning(ns_log_default, "zone transfer timeout for \"%s\"; kill pid %lu: %s", zp->z_origin, (u_long)zp->z_xferpid, strerror(errno)); else ns_warning(ns_log_default, "zone transfer timeout for \"%s\"; second kill \ pid %lu - forgetting, processes may accumulate", zp->z_origin, (u_long)zp->z_xferpid); zp->z_xferpid = 0; xfers_running--; zp->z_flags &= ~(Z_XFER_RUNNING|Z_XFER_ABORTED|Z_XFER_GONE); } else if (kill(zp->z_xferpid, SIGTERM) == -1) { if (errno == ESRCH) /* No warning on first time, it may have just exited */ zp->z_flags |= Z_XFER_GONE; else { ns_warning(ns_log_default, "zone transfer timeout for \"%s\"; pid %lu kill failed %s", zp->z_origin, (u_long)zp->z_xferpid, strerror(errno)); zp->z_flags |= Z_XFER_ABORTED; } } else { ns_notice(ns_log_default, "zone transfer timeout for \"%s\"; pid %lu killed", zp->z_origin, (u_long)zp->z_xferpid); zp->z_flags |= Z_XFER_ABORTED; } } /* * Process exit of xfer's. */ void reapchild(void) { int i; pid_t pid; WAIT_T status; gettime(&tt); while ((pid = (pid_t)waitpid(-1, &status, WNOHANG)) > 0) { for (i = 0; i < MAX_XFERS_RUNNING; i++) { if (xferstatus[i].xfer_pid == pid) { xferstatus[i].xfer_status = status; xferstatus[i].xfer_state = XFER_DONE; ns_need(main_need_endxfer); break; } } } } /* * Finish processing of of finished xfers */ void endxfer() { struct zoneinfo *zp; int exitstatus, i; pid_t pid; WAIT_T status; gettime(&tt); for (i = 0; i < MAX_XFERS_RUNNING; i++) { if (xferstatus[i].xfer_state != XFER_DONE) continue; pid = xferstatus[i].xfer_pid; status = xferstatus[i].xfer_status; exitstatus = WIFEXITED(status) ? WEXITSTATUS(status) : 0; for (zp = zones; zp < &zones[nzones]; zp++) { if (zp->z_xferpid != pid) continue; xfers_running--; zp->z_xferpid = 0; zp->z_flags &= ~(Z_XFER_RUNNING|Z_XFER_ABORTED|Z_XFER_GONE); ns_debug(ns_log_default, 1, "\nendxfer: child %d zone %s returned status=%d termsig=%d", pid, zp->z_origin, exitstatus, WIFSIGNALED(status) ? WTERMSIG(status) : -1); if (WIFSIGNALED(status)) { if (WTERMSIG(status) != SIGKILL) { ns_notice(ns_log_default, "named-xfer \"%s\" exited with signal %d", zp->z_origin[0]?zp->z_origin:".", WTERMSIG(status)); } ns_retrytime(zp, tt.tv_sec); sched_zone_maint(zp); } else { switch (exitstatus) { case XFER_UPTODATE: markUpToDate(zp); sched_zone_maint(zp); break; case XFER_SUCCESSAXFR: case XFER_SUCCESSAXFRIXFRFILE: zp->z_xferpid = XFER_ISAXFR; if (exitstatus == XFER_SUCCESSAXFRIXFRFILE) { zp->z_xferpid = XFER_ISAXFRIXFR; } if (zp->z_ixfr_tmp != NULL) isc_movefile(zp->z_ixfr_tmp, zp->z_source); /* XXX should incorporate loadxfer() */ zp->z_flags |= Z_NEED_RELOAD; zp->z_flags &= ~Z_SYSLOGGED; ns_need(main_need_zoneload); break; case XFER_SUCCESSIXFR: zp->z_xferpid = XFER_ISIXFR; ns_notice(ns_log_default, "IXFR Success %s", zp->z_ixfr_tmp); if (merge_logs(zp, zp->z_ixfr_tmp) >= 0) { ns_notice(ns_log_default, "IXFR Merge success %s", zp->z_ixfr_tmp); (void)unlink(zp->z_updatelog); (void)unlink(zp->z_ixfr_base); isc_movefile(zp->z_ixfr_tmp, zp->z_ixfr_base); (void)unlink(zp->z_ixfr_tmp); if (zonedump(zp, ISIXFR) < 0) ns_warning(ns_log_db, "error in write ixfr updates to zone file %s", zp ->z_source); ns_refreshtime(zp, tt.tv_sec); sched_zone_maint(zp); } else { ns_notice(ns_log_default, "IXFR Merge failed %s", zp->z_ixfr_tmp); ns_retrytime(zp, tt.tv_sec); sched_zone_maint(zp); } break; case XFER_TIMEOUT: if (!(zp->z_flags & Z_SYSLOGGED)) { zp->z_flags |= Z_SYSLOGGED; ns_notice(ns_log_default, "zoneref: Masters for slave zone \"%s\" unreachable", zp->z_origin); } ns_retrytime(zp, tt.tv_sec); sched_zone_maint(zp); break; default: if (!(zp->z_flags & Z_SYSLOGGED)) { zp->z_flags |= Z_SYSLOGGED; ns_notice(ns_log_default, "named-xfer for \"%s\" exited %d", zp->z_origin, exitstatus); } /* FALLTHROUGH */ case XFER_FAIL: zp->z_flags |= Z_SYSLOGGED; ns_retrytime(zp, tt.tv_sec); sched_zone_maint(zp); break; } break; } } xferstatus[i].xfer_state = XFER_IDLE; xferstatus[i].xfer_pid = 0; } tryxfer(); } /* * Try to start some xfers - new "fair scheduler" by Bob Halley @DEC (1995) */ static void tryxfer() { static struct zoneinfo *zp = NULL; static struct zoneinfo *lastzones = NULL; static int lastnzones = 0; struct zoneinfo *startzp, *stopzp; /* initialize, and watch out for changes in zones! */ if (lastzones != zones) { if (lastzones != NULL) ns_debug(ns_log_default, 3, "zones changed: %p != %p", lastzones, zones); lastzones = zones; zp = zones; } /* did zones shrink? */ if (lastnzones > nzones) { ns_debug(ns_log_default, 3, "zones shrunk"); zp = zones; } lastnzones = nzones; if (zp == zones) stopzp = &zones[nzones-1]; else stopzp = zp - 1; ns_debug(ns_log_default, 3, "tryxfer start zp=%p stopzp=%p def=%d running=%d", zp, stopzp, xfers_deferred, xfers_running); startzp = zp; for (;;) { int xfers; if (!xfers_deferred || xfers_running >= server_options->transfers_in) break; if ((xfers = nxfers(zp)) != -1 && xfers < server_options->transfers_per_ns && (zp->z_flags & Z_NEED_XFER)) { startxfer(zp); sched_zone_maint(zp); } if (zp == stopzp) { ns_debug(ns_log_default, 3, "tryxfer stop mark"); zp = startzp; break; } zp++; /* wrap around? */ if (zp == &zones[nzones]) zp = zones; } ns_debug(ns_log_default, 3, "tryxfer stop zp=%p", zp); } /* * Reload zones whose transfers have completed. */ void loadxfer(void) { struct zoneinfo *zp; u_int32_t old_serial,new_serial; char *tmpnom; int isixfr; gettime(&tt); for (zp = zones; zp < &zones[nzones]; zp++) { if (zp->z_flags & Z_NEED_RELOAD) { ns_debug(ns_log_default, 1, "loadxfer() \"%s\"", zp->z_origin[0] ? zp->z_origin : "."); zp->z_flags &= ~(Z_NEED_RELOAD|Z_AUTH); /* XXX this is bad, should be done in ns_zreload() for primary changes. */ ns_stopxfrs(zp); old_serial = zp->z_serial; if (zp->z_xferpid == XFER_ISIXFR) { tmpnom = zp->z_ixfr_tmp; isixfr = ISIXFR; } else { tmpnom = zp->z_source; purge_zone(zp->z_origin, hashtab, zp->z_class); isixfr = ISNOTIXFR; } if (zp->z_xferpid == XFER_ISAXFRIXFR) { tmpnom= zp->z_source; purge_zone(zp->z_origin, hashtab, zp->z_class); isixfr = ISNOTIXFR; } if (!db_load(tmpnom, zp->z_origin, zp, NULL, isixfr)) { zp->z_flags |= Z_AUTH; zp->z_flags &= ~Z_EXPIRED; if (isixfr == ISIXFR) { new_serial= zp ->z_serial; ns_warning(ns_log_db, "ISIXFR"); ns_warning(ns_log_db, "error in updating ixfr data base file %s from %s", zp -> z_ixfr_base, zp ->z_ixfr_tmp); if (zonedump(zp,ISIXFR)<0) ns_warning(ns_log_db, "error in write ixfr updates to zone file %s", zp ->z_source); } } zp->z_xferpid = 0; if (zp->z_flags & Z_TMP_FILE) (void) unlink(zp->z_source); sched_zone_maint(zp); } } } /* * Add this zone to the set of those needing transfers. */ void addxfer(struct zoneinfo *zp) { if (!(zp->z_flags & Z_NEED_XFER)) { zp->z_flags |= Z_NEED_XFER; xfers_deferred++; tryxfer(); } } /* * Mark one zone as requiring a reload. * Note that it should be called with signals blocked, * and should not allocate memory (since it can be called from a sighandler). */ const char * deferred_reload_unsafe(struct zoneinfo *zp) { INSIST(zp->z_type != z_nil); if (!zonefile_changed_p(zp)) return ("Zone file has not changed."); if (LINKED(zp, z_reloadlink)) return ("Zone is already scheduled for reloading."); APPEND(reloadingzones, zp, z_reloadlink); ns_need_unsafe(main_need_zreload); return ("Zone is now scheduled for reloading."); } /* * If we've loaded this file, and the file has not been modified and contains * no $INCLUDE, then there's no need to reload. */ int zonefile_changed_p(struct zoneinfo *zp) { struct stat sb; INSIST(zp->z_type != z_nil); return ((zp->z_flags & Z_INCLUDE) != 0 || stat(zp->z_source, &sb) == -1 || zp->z_ftime != sb.st_mtime); } int reload_master(struct zoneinfo *zp) { INSIST(zp->z_type == z_master); zp->z_flags &= ~Z_AUTH; ns_stopxfrs(zp); /* XXX what about parent zones? */ #ifdef BIND_UPDATE /* * A dynamic zone might have changed, so we * need to dump it before reloading it. */ if ((zp->z_flags & Z_DYNAMIC) != 0 && ((zp->z_flags & Z_NEED_SOAUPDATE) != 0 || (zp->z_flags & Z_NEED_DUMP) != 0)) (void) zonedump(zp, ISNOTIXFR); #endif purge_zone(zp->z_origin, hashtab, zp->z_class); ns_debug(ns_log_config, 1, "reloading zone"); #ifdef BIND_UPDATE if ((zp->z_flags & Z_DYNAMIC) != 0) { struct stat sb; if (stat(zp->z_source, &sb) < 0) ns_error(ns_log_config, "stat(%s) failed: %s", zp->z_source, strerror(errno)); else { if ((sb.st_mode & (S_IWUSR|S_IWGRP|S_IWOTH)) != 0) ns_warning(ns_log_config, "dynamic zone file '%s' is writable", zp->z_source); } } #endif if (!db_load(zp->z_source, zp->z_origin, zp, NULL, ISNOTIXFR)) zp->z_flags |= Z_AUTH; zp->z_refresh = 0; /* no maintenance needed */ zp->z_time = 0; #ifdef BIND_UPDATE zp->z_lastupdate = 0; if ((zp->z_flags & Z_DYNAMIC) != 0) if (merge_logs(zp, zp->z_updatelog) == 1) return (1); #endif return (0); } /* * Called by main() when main_need_zreload has been set. Should pull one * zone off of the reloadingzones list and reload it, then if the list is * not then empty, should turn main_need_zreload on again for the next call. * It is not an error to call this when the reloadingzones list is empty. */ void ns_zreload(void) { struct zoneinfo *zp; block_signals(); if (EMPTY(reloadingzones)) { unblock_signals(); return; } zp = HEAD(reloadingzones); UNLINK(reloadingzones, zp, z_reloadlink); unblock_signals(); reload_master(zp); block_signals(); if (!EMPTY(reloadingzones)) ns_need_unsafe(main_need_zreload); unblock_signals(); } /* * Flush and reload configuration file and data base. */ void ns_reload(void) { ns_notice(ns_log_default, "%s %snameserver", (reconfiging != 0) ? "reconfiguring" : "reloading", (noexpired == 1) ? "(-noexpired) " : ""); INSIST(reloading == 0); qflush(); sq_flush(NULL); reloading++; /* To force transfer if slave and backing up. */ confmtime = ns_init(conffile); time(&resettime); reloading--; ns_notice(ns_log_default, "Ready to answer queries."); } /* * Reload configuration, look for new or deleted zones, not changed ones * also ignore expired zones. */ void ns_noexpired(void) { INSIST(noexpired == 0); noexpired++; /* To ignore zones which are expired */ ns_reconfig(); noexpired--; } /* * Reload configuration, look for new or deleted zones, not changed ones. */ void ns_reconfig(void) { INSIST(reconfiging == 0); reconfiging++; /* To ignore zones which aren't new or deleted. */ ns_reload(); reconfiging--; } void make_new_zones(void) { struct zoneinfo *zp; int n; int newzones = (nzones == 0) ? INITIALZONES : NEWZONES; ns_debug(ns_log_config, 1, "Adding %d template zones", NEWZONES); zp = (struct zoneinfo *) memget((nzones + newzones) * sizeof(struct zoneinfo)); if (zp == NULL) panic("no memory for more zones", NULL); memset(zp, 0, (nzones + newzones) * sizeof(struct zoneinfo)); if (zones != NULL) { memcpy(zp, zones, nzones * sizeof(struct zoneinfo)); memput(zones, nzones * sizeof(struct zoneinfo)); } zones = zp; block_signals(); for (n = 0; n < newzones; n++) { INIT_LINK(&zones[nzones], z_reloadlink); INIT_LINK(&zones[nzones], z_freelink); if (nzones != 0) free_zone(&zones[nzones]); nzones++; } unblock_signals(); } void free_zone(struct zoneinfo *zp) { if (LINKED(zp, z_reloadlink)) panic("freeing reloading zone", NULL); if (zp->z_type != z_nil) panic("freeing unfree zone", NULL); APPEND(freezones, zp, z_freelink); } #ifndef HAVE_SPAWNXFER static pid_t spawnxfer(char **argv, struct zoneinfo *zp) { pid_t pid = (pid_t)vfork(); if (pid == -1) { ns_error(ns_log_default, "xfer vfork: %s", strerror(errno)); zp->z_time = tt.tv_sec + 10; return (pid); } if (pid == 0) { /* Child. */ execv(server_options->named_xfer, argv); ns_error(ns_log_default, "can't exec %s: %s", server_options->named_xfer, strerror(errno)); _exit(XFER_FAIL); /* Avoid duplicate buffer flushes. */ } return (pid); } #endif struct zoneinfo * find_auth_zone(const char *zname, ns_class zclass) { struct zoneinfo *zp; struct hashbuf *htp; struct namebuf *np; const char *fname; int zn; zp = find_zone(zname, zclass); if (zp != NULL && (zp->z_type == z_slave || zp->z_type == z_master || zp->z_type == z_stub)) return (zp); htp = hashtab; np = nlookup(zname, &htp, &fname, 0); if (np != NULL && (zn = findMyZone(np, zclass)) != DB_Z_CACHE) return (&zones[zn]); return (NULL); }