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freebsd-nq/contrib/bind/bin/named/ns_maint.c
Peter Wemm 15f7f56992 Import final bind-8.1.2 release. 
Obtained from: ftp.isc.org
1998-06-11 05:01:49 +00:00

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#if !defined(lint) && !defined(SABER)
static char sccsid[] = "@(#)ns_maint.c 4.39 (Berkeley) 3/2/91";
static char rcsid[] = "$Id: ns_maint.c,v 8.39 1998/04/14 00:34:39 halley 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, 1997 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.
*/
#include "port_before.h"
#include <sys/param.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <arpa/nameser.h>
#include <errno.h>
#include <signal.h>
#include <resolv.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <time.h>
#include <unistd.h>
#include <isc/eventlib.h>
#include <isc/logging.h>
#include <isc/memcluster.h>
#include "port_after.h"
#include "named.h"
static int xfers_running, /* # of xfers running */
xfers_deferred, /* # of needed xfers not run yet */
qserials_running,
nxfers(struct zoneinfo *, int),
bottom_of_zone(struct databuf *, int);
static void startxfer(struct zoneinfo *),
abortxfer(struct zoneinfo *),
addxfer(struct zoneinfo *),
tryxfer(void),
purge_z_2(struct hashbuf *, int);
#define qserial_qfull() (qserials_running == MAXQSERIAL)
static time_t stats_time;
/* State of all running zone transfers */
static struct {
pid_t xfer_pid;
int xfer_state; /* see below */
WAIT_T xfer_status;
} xferstatus[MAX_XFERS_RUNNING];
#define XFER_IDLE 0
#define XFER_RUNNING 1
#define XFER_DONE 2
/*
* Perform maintenance on all zones that need it.
*/
void
ns_maint() {
struct zoneinfo *zp;
int zonenum, deleted;
gettime(&tt);
ns_debug(ns_log_maint, 1, "ns_maint()");
for (zp = zones, zonenum = 0; zp < &zones[nzones]; zp++, zonenum++)
zone_maint(zp);
ns_debug(ns_log_maint, 1, "exit ns_maint()");
}
/*
* 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)) {
zp->z_serial = 0;
/* XXX should we clear Z_AUTH here? */
}
if (zp->z_flags & (Z_NEED_RELOAD|Z_NEED_XFER|Z_QSERIAL)) {
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;
}
qserial_query(zp);
break;
#ifdef BIND_UPDATE
case Z_PRIMARY:
if (! (zp->z_flags & Z_DYNAMIC))
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) < 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);
}
}
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->type, zti->class);
if (zp == NULL) {
ns_error(ns_log_maint,
"do_zone_maint: %s zone '%s' (class %s) is not authoritative",
zoneTypeString(zp), 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;
char *zone_name;
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)) {
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 RR%s",
deleted, (deleted==1) ? "" : "s");
}
/*
* 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;
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 (qserial_qfull()) {
qserial_retrytime(zp, tt.tv_sec);
return;
}
qp = sysquery(zp->z_origin, zp->z_class, T_SOA,
zp->z_addr, zp->z_addrcnt, QUERY);
if (!qp) {
ns_info(ns_log_default, "qserial_query(%s): sysquery FAILED",
zp->z_origin);
/* XXX - this is bad, we should do something */
qserial_retrytime(zp, tt.tv_sec);
return;
}
qp->q_flags |= Q_ZSERIAL;
qp->q_zquery = zp;
zp->z_flags |= Z_QSERIAL;
zp->z_xaddr = inaddr_any;
ns_refreshtime(zp, tt.tv_sec);
qserials_running++;
ns_debug(ns_log_default, 1, "qserial_query(%s) QUEUED", zp->z_origin);
}
void
qserial_answer(struct qinfo *qp, u_int32_t serial, struct sockaddr_in from) {
struct zoneinfo *zp = qp->q_zquery;
ns_debug(ns_log_default, 1, "qserial_answer(%s, %u)", zp->z_origin,
serial);
zp->z_flags &= ~Z_QSERIAL;
qp->q_flags &= ~Q_ZSERIAL; /* keeps us from being called twice */
qserials_running--;
if (serial == 0) {
/* An error occurred, or the query timed out. */
ns_info(ns_log_default, "Err/TO getting serial# for \"%s\"",
zp->z_origin);
addxfer(zp);
} else if (SEQ_GT(serial, zp->z_serial) || !zp->z_serial) {
ns_debug(ns_log_default, 1,
"qserial_answer: zone is out of date");
zp->z_xaddr = from.sin_addr; /* don't use qp->q_from */
addxfer(zp);
} else if (SEQ_GT(zp->z_serial, serial)) {
if (!haveComplained((u_long)zp, (u_long)"went backward")) {
ns_notice(ns_log_default,
"Zone \"%s\" (class %d) SOA serial# (%u) rcvd from [%s] is < ours (%u)",
zp->z_origin, zp->z_class, serial,
inet_ntoa(from.sin_addr), zp->z_serial);
}
} else {
ns_debug(ns_log_default, 1,
"qserial_answer: zone serial is still OK");
markUpToDate(zp);
sched_zone_maint(zp);
}
}
/*
* Start an asynchronous zone transfer for a zone.
* Depends on current time being in tt.
* Caller must do sched_zone_maint(zp) after startxfer returns.
*/
static void
startxfer(struct zoneinfo *zp) {
char *argv[NSMAX + 20], argv_ns[NSMAX][MAXDNAME];
int argc = 0, argc_ns = 0, pid, i;
u_int cnt;
char debug_str[10];
char serial_str[10];
char port_str[10];
char class_str[10];
char src_str[20];
ns_debug(ns_log_default, 1, "startxfer() %s", 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;
argv[argc++] = "-s";
sprintf(serial_str, "%u", zp->z_serial);
argv[argc++] = serial_str;
if (zp->z_axfr_src.s_addr != 0) {
argv[argc++] = "-x";
argv[argc++] = strcpy(src_str, inet_ntoa(zp->z_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", 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 (ina_hlong(zp->z_xaddr) != INADDR_ANY) {
/*
* Address was specified by the qserial logic, use it
* first.
*/
if (aIsUs(zp->z_xaddr) &&
!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(zp->z_xaddr));
} else
argv[argc++] = strcpy(argv_ns[argc_ns++],
inet_ntoa(zp->z_xaddr));
}
/*
* Copy the server ip addresses into argv, after converting
* to ascii and saving the static inet_ntoa result. Skip zp->z_xaddr
* if seen.
*/
for (cnt = 0; cnt < zp->z_addrcnt; cnt++) {
struct in_addr a;
a = zp->z_addr[cnt];
if (ina_equal(a, zp->z_xaddr))
continue;
if (aIsUs(a) &&
!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));
}
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, buffer);
}
#endif /* DEBUG */
gettime(&tt);
for (i = 0; i < MAX_XFERS_RUNNING; i++) {
if (xferstatus[i].xfer_pid == 0) {
xferstatus[i].xfer_state = XFER_RUNNING;
break;
}
}
if ((pid = vfork()) == -1) {
ns_error(ns_log_default, "xfer vfork: %s", strerror(errno));
zp->z_time = tt.tv_sec + 10;
return;
}
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. */
}
/* Parent. */
xferstatus[i].xfer_pid = pid; /* XXX - small race condition here if we
* can't hold signals */
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++;
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(const struct zoneinfo *zp) {
static char ret[sizeof "(4294967296?)"]; /* 2^32 */
switch (zp->z_type) {
case Z_MASTER: return ("master");
case Z_SLAVE: return ("slave");
#ifdef STUBS
case Z_STUB: return ("stub");
#endif
case Z_CACHE: return ("cache");
default:
sprintf(ret, "(%u?)", (u_int32_t)zp->z_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));
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) {
ns_debug(category, level,
"\tdumpintvl %lu, soaincrintvl %lu deferupdcnt %lu",
zp->z_dumpintvl, zp->z_soaincrintvl,
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 */
/* 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.
*/
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) {
for (pdp = NULL, dp = np->n_data; dp != NULL;
(void)NULL) {
if (dp->d_zone == DB_Z_CACHE &&
(stale(dp) || all)) {
dp = rm_datum(dp, np, pdp, NULL);
deleted++;
} 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);
}
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;
}
}
/* remove entry from cache, if required */
if (np->n_hash == NULL && np->n_data == NULL) {
struct namebuf **npp, **nppend;
struct namebuf *npn, *pnp, *nnp;
ns_debug(ns_log_default, 3,
"purge_zone: cleaning cache");
/* Walk parent hashtable looking for ourself. */
if (np->n_parent)
phtp = np->n_parent->n_hash;
else
phtp = htp; /* top / root zone */
if (phtp) {
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_zone: found our selves");
npn = rm_name(nnp,npp,pnp);
phtp->h_cnt--;
} else {
npn = nnp->n_next;
pnp = nnp;
}
}
}
}
}
}
}
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, int delta) {
struct in_addr nsa;
struct nameser *nsp;
int ret;
if (ina_hlong(zp->z_xaddr) != INADDR_ANY)
nsa = zp->z_xaddr; /* qserial overrode address */
else if (!zp->z_addrcnt)
return (-1);
else
nsa = zp->z_addr[0]; /* first ns holds zone's xfer limit */
if (!(nsp = nameserFind(nsa, NS_F_INSERT)))
return (-1); /* probably ENOMEM */
ret = nsp->xfers;
if (delta < 0 && -delta > ret)
return (-1); /* taking more than we have */
nsp->xfers += delta;
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--;
(void)nxfers(zp, -1);
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;
}
}
/*
* SIGCHLD signal handler: process exit of xfer's.
*/
void
reapchild(evContext ctx, void *uap, int sig) {
int pid, i;
WAIT_T status;
int saved_errno = errno;
gettime(&tt);
while ((pid = 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;
}
}
}
errno = saved_errno;
}
/*
* Finish processing of of finished xfers
*/
void
endxfer() {
struct zoneinfo *zp;
int exitstatus, pid, i;
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--;
(void) nxfers(zp, -1);
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_SUCCESS:
/* XXX should incorporate loadxfer() */
zp->z_flags |= Z_NEED_RELOAD;
zp->z_flags &= ~Z_SYSLOGGED;
ns_need(MAIN_NEED_ZONELOAD);
break;
case XFER_TIMEOUT:
if (!(zp->z_flags & Z_SYSLOGGED)) {
zp->z_flags |= Z_SYSLOGGED;
ns_notice(ns_log_default,
"zoneref: Masters for secondary 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, 0)) != -1 &&
xfers < server_options->transfers_per_ns &&
(zp->z_flags & Z_NEED_XFER)) {
nxfers(zp, 1);
xfers_deferred--;
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() {
struct zoneinfo *zp;
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_reload() for primary changes. */
ns_stopxfrs(zp);
purge_zone(zp->z_origin, hashtab, zp->z_class);
if (!db_load(zp->z_source, zp->z_origin, zp, NULL))
zp->z_flags |= Z_AUTH;
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.
*/
static void
addxfer(struct zoneinfo *zp) {
if (!(zp->z_flags & Z_NEED_XFER)) {
zp->z_flags |= Z_NEED_XFER;
xfers_deferred++;
tryxfer();
}
}
/*
* Flush and reload data base.
*/
void
ns_reload() {
ns_notice(ns_log_default, "reloading nameserver");
qflush();
sq_flush(NULL);
#ifdef FORCED_RELOAD
reloading = 1; /* to force transfer if secondary and backing up */
#endif
ns_init(conffile);
time(&resettime);
#ifdef FORCED_RELOAD
reloading = 0;
#endif /* FORCED_RELOAD */
ns_notice(ns_log_default, "Ready to answer queries.");
}
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