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freebsd-dev/contrib/bind/named/ns_maint.c
Peter Wemm d6da9453b6 Take #2. Import bind-4.9.4-P1 into the intended directory! 
This has most of the non-essential stuff removed (ie: what is not built)

bmake glue to follow.
1996-08-29 19:20:22 +00:00

1101 lines
26 KiB
C
Raw Blame History

#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 8.16 1996/08/05 08:31:30 vixie Exp $";
#endif /* not lint */
/*
* ++Copyright++ 1986, 1988
* -
* 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.
* -
* --Copyright--
*/
#include <sys/param.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <arpa/nameser.h>
#include <sys/wait.h>
#include <stdio.h>
#include <syslog.h>
#include <signal.h>
#include <errno.h>
#include <sys/stat.h>
#include "named.h"
#ifdef USE_UTIME
# include <utime.h>
#endif
static int xfers_running, /* # of xfers running */
xfers_deferred, /* # of needed xfers not run yet */
qserials_running,
alarm_pending, /* flag */
nxfers __P((struct zoneinfo *, int));
static void startxfer __P((struct zoneinfo *)),
abortxfer __P((struct zoneinfo *)),
addxfer __P((struct zoneinfo *)),
tryxfer __P((void));
#define qserial_qfull() (qserials_running == MAXQSERIAL)
#ifdef CLEANCACHE
static time_t cache_time;
#endif
#ifdef XSTATS
static time_t stats_time;
#endif
/*
* Invoked at regular intervals by signal interrupt; refresh all secondary
* zones from primary name server and remove old cache entries. Also,
* ifdef'd ALLOW_UPDATES, dump database if it has changed since last
* dump/bootup.
*/
void
ns_maint()
{
register struct zoneinfo *zp;
int zonenum;
gettime(&tt);
dprintf(1, (ddt, "\nns_maint(); now %s", ctimel(tt.tv_sec)));
alarm_pending = 0;
for (zp = zones, zonenum = 0; zp < &zones[nzones]; zp++, zonenum++) {
#ifdef DEBUG
if (debug >= 2)
printzoneinfo(zonenum);
#endif
if (tt.tv_sec >= zp->z_time && zp->z_refresh > 0) {
switch (zp->z_type) {
case Z_CACHE:
doachkpt();
ns_refreshtime(zp, tt.tv_sec);
break;
case Z_SECONDARY:
#ifdef STUBS
case Z_STUB:
#endif
if (zp->z_serial != 0 &&
((zp->z_lastupdate + zp->z_expire) <
tt.tv_sec)
) {
zp->z_serial = 0;
}
if (zp->z_flags &
(Z_NEED_RELOAD|Z_NEED_XFER|Z_QSERIAL)) {
ns_refreshtime(zp, tt.tv_sec);
break;
}
if (zp->z_flags & Z_XFER_RUNNING) {
abortxfer(zp);
break;
}
qserial_query(zp);
break;
#ifdef ALLOW_UPDATES
case Z_PRIMARY:
/*
* Checkpoint the zone if it has changed
* since we last checkpointed
*/
if (zp->z_flags & Z_CHANGED) {
zonedump(zp);
ns_refreshtime(zp, tt.tv_sec);
}
break;
#endif /* ALLOW_UPDATES */
}
gettime(&tt);
}
}
#ifdef CLEANCACHE
if ((cache_time + cache_interval) <= tt.tv_sec) {
if (cache_time && (!NoRecurse || !NoFetchGlue))
remove_zone(hashtab, 0, 0);
cache_time = tt.tv_sec;
}
#endif
#ifdef XSTATS
if (stats_time + stats_interval <= tt.tv_sec) {
if (stats_time)
ns_logstats();
stats_time = tt.tv_sec;
}
#endif
if (!needmaint)
sched_maint();
dprintf(1, (ddt, "exit ns_maint()\n"));
}
/*
* Find when the next refresh needs to be and set
* interrupt time accordingly.
*/
void
sched_maint()
{
register struct zoneinfo *zp;
struct itimerval ival;
#ifdef CLEANCACHE
time_t next_refresh = cache_time + cache_interval;
#else
time_t next_refresh = 0;
#endif
static time_t next_alarm;
for (zp = zones; zp < &zones[nzones]; zp++)
if (zp->z_time != 0 &&
(next_refresh == 0 || next_refresh > zp->z_time))
next_refresh = zp->z_time;
/*
* Schedule the next call to ns_maint.
* Don't visit any sooner than maint_interval.
*/
bzero((char *)&ival, sizeof ival);
if (next_refresh != 0) {
if (next_refresh == next_alarm && alarm_pending) {
dprintf(1, (ddt, "sched_maint: no schedule change\n"));
return;
}
/*
* tv_sec can be an unsigned long, so we can't let
* it go negative.
*/
if (next_refresh < tt.tv_sec)
next_refresh = tt.tv_sec;
ival.it_value.tv_sec = next_refresh - tt.tv_sec;
if ((long) ival.it_value.tv_sec < maint_interval)
ival.it_value.tv_sec = maint_interval;
next_alarm = next_refresh;
alarm_pending = 1;
}
(void) setitimer(ITIMER_REAL, &ival, (struct itimerval *)NULL);
dprintf(1, (ddt, "sched_maint: Next interrupt in %lu sec\n",
(u_long)ival.it_value.tv_sec));
}
/*
* Mark a zone "up to date" after named-xfer tells us this or we
* discover it through the qserial_*() logic.
*/
static void
markUpToDate(zp)
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) {
#if defined(USE_UTIME)
struct utimbuf t;
t.actime = tt.tv_sec;
t.modtime = tt.tv_sec;
(void) utime(zp->z_source, &t);
#else
struct timeval t[2];
t[0] = tt;
t[1] = tt;
(void) utimes(zp->z_source, t);
#endif /* USE_UTIME */
}
/* 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? */
}
/*
* Query for the serial number of a zone, so that
* we can check to see if we need to transfer it.
*/
void
qserial_query(zp)
struct zoneinfo *zp;
{
struct qinfo *qp;
dprintf(1, (ddt, "qserial_query(%s)\n", zp->z_origin));
if (qserial_qfull())
return;
qp = sysquery(zp->z_origin, zp->z_class, T_SOA,
zp->z_addr, zp->z_addrcnt, QUERY);
if (!qp) {
syslog(LOG_INFO, "qserial_query(%s): sysquery FAILED",
zp->z_origin);
return; /* XXX - this is bad, we should do something */
}
qp->q_flags |= Q_ZSERIAL;
qp->q_zquery = zp;
zp->z_flags |= Z_QSERIAL;
ns_refreshtime(zp, tt.tv_sec);
qserials_running++;
dprintf(1, (ddt, "qserial_query(%s) QUEUED\n", zp->z_origin));
}
void
qserial_answer(qp, serial)
struct qinfo *qp;
u_int32_t serial;
{
struct zoneinfo *zp = qp->q_zquery;
int was_qfull = qserial_qfull();
dprintf(1, (ddt, "qserial_answer(%s, %lu)\n",
zp->z_origin, (u_long)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.
*/
#ifdef GETSER_LOGGING
syslog(GETSER_LOGGING, "Err/TO getting serial# for \"%s\"",
zp->z_origin);
#endif /* GETSER_LOGGING */
addxfer(zp);
} else if (SEQ_GT(serial, zp->z_serial) || !zp->z_serial) {
dprintf(1, (ddt, "qserial_answer: zone is out of date\n"));
zp->z_xaddr = from_addr.sin_addr; /* don't use qp->q_from */
addxfer(zp);
} else if (SEQ_GT(zp->z_serial, serial)) {
if (!haveComplained((char*)zp, "went backward")) {
syslog(LOG_NOTICE,
"Zone \"%s\" (class %d) SOA serial# (%lu) rcvd from [%s] is < ours (%lu)\n",
zp->z_origin, zp->z_class, (u_long)serial,
inet_ntoa(from_addr.sin_addr),
(u_long)zp->z_serial);
}
} else {
dprintf(1, (ddt, "qserial_answer: zone serial is still OK\n"));
markUpToDate(zp);
}
if (was_qfull)
needmaint = 1;
}
/*
* Hold and release SIGCHLD
*/
#ifdef POSIX_SIGNALS
static sigset_t sset;
#else
#ifndef SYSV
static int omask;
#endif
#endif /* POSIX_SIGNALS */
void holdsigchld()
{
#ifdef POSIX_SIGNALS
sigemptyset(&sset);
sigaddset(&sset,SIGCHLD);
sigprocmask(SIG_BLOCK,&sset,NULL);
#else /* POSIX_SIGNALS */
#ifndef SYSV
omask = sigblock(sigmask(SIGCHLD));
#else /* SYSV */
/* XXX - out of luck? */
#endif /* SYSV */
#endif /* POSIX_SIGNALS */
}
void releasesigchld()
{
#ifdef POSIX_SIGNALS
sigprocmask(SIG_UNBLOCK,&sset,NULL);
#else
#ifndef SYSV
(void) sigsetmask(omask);
#endif
#endif /* POSIX_SIGNALS */
}
/* State of all running zone transfers */
static struct {
pid_t xfer_pid;
int xfer_state; /* see below */
#ifdef sequent
union wait xfer_status;
#else
int xfer_status;
#endif
} xferstatus[MAX_XFERS_RUNNING];
#define XFER_IDLE 0
#define XFER_RUNNING 1
#define XFER_DONE 2
/*
* Start an asynchronous zone transfer for a zone.
* Depends on current time being in tt.
* The caller must call sched_maint after startxfer.
*/
static void
startxfer(zp)
struct zoneinfo *zp;
{
static char *argv[NSMAX + 20], argv_ns[NSMAX][MAXDNAME];
int argc = 0, argc_ns = 0, pid, i;
unsigned int cnt;
char debug_str[10];
char serial_str[10];
char port_str[10];
#ifdef GEN_AXFR
char class_str[10];
#endif
dprintf(1, (ddt, "startxfer() %s\n", zp->z_origin));
argv[argc++] = _PATH_XFER;
argv[argc++] = "-z";
argv[argc++] = zp->z_origin;
argv[argc++] = "-f";
argv[argc++] = zp->z_source;
argv[argc++] = "-s";
sprintf(serial_str, "%lu", (u_long)zp->z_serial);
argv[argc++] = serial_str;
#ifdef GEN_AXFR
argv[argc++] = "-C";
sprintf(class_str, "%d", zp->z_class);
argv[argc++] = class_str;
#endif
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 (zp->z_xaddr.s_addr != 0) {
/* Address was specified by the qserial logic, use it. */
argv[argc++] = strcpy(argv_ns[argc_ns++],
inet_ntoa(zp->z_xaddr));
} else {
/*
* Copy the server ip addresses into argv, after converting
* to ascii and saving the static inet_ntoa result.
*/
for (cnt = 0; cnt < zp->z_addrcnt; cnt++) {
struct in_addr a;
a = zp->z_addr[cnt];
if (aIsUs(a) &&
!haveComplained(zp->z_origin, (char*)startxfer)) {
syslog(LOG_NOTICE,
"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] = 0;
#ifdef DEBUG
if (debug) {
for (i = 0; i < argc; i++)
fprintf(ddt, " %s", argv[i]);
fprintf(ddt, "\n");
}
#endif /* DEBUG */
gettime(&tt);
holdsigchld();
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) {
syslog(LOG_ERR, "xfer vfork: %m");
releasesigchld();
zp->z_time = tt.tv_sec + 10;
return;
}
if (pid == 0) {
/* Child. */
execv(_PATH_XFER, argv);
syslog(LOG_ERR, "can't exec %s: %m", _PATH_XFER);
_exit(XFER_FAIL); /* Avoid duplicate buffer flushes. */
}
/* Parent. */
xferstatus[i].xfer_pid = pid; /* XXX - small race condition here if we
* can't hold signals */
dprintf(1, (ddt, "started xfer child %d\n", pid));
zp->z_flags &= ~Z_NEED_XFER;
zp->z_flags |= Z_XFER_RUNNING;
zp->z_xferpid = pid;
xfers_running++;
zp->z_time = tt.tv_sec + MAX_XFER_TIME;
releasesigchld();
}
const char *
zoneTypeString(zp)
const struct zoneinfo *zp;
{
static char ret[sizeof "(4294967296?)"]; /* 2^32 */
switch (zp->z_type) {
case Z_PRIMARY: return ("primary");
case Z_SECONDARY: return ("secondary");
#ifdef STUBS
case Z_STUB: return ("stub");
#endif
case Z_CACHE: return ("cache");
default:
sprintf(ret, "(%lu?)", (u_long)zp->z_type);
return (ret);
}
}
#ifdef DEBUG
void
printzoneinfo(zonenum)
int zonenum;
{
struct timeval tt;
struct zoneinfo *zp = &zones[zonenum];
if (!debug)
return;
if (!zp->z_origin)
return;
fprintf(ddt, "printzoneinfo(%d):\n", zonenum);
gettime(&tt);
fprintf(ddt, "origin ='%s'", zp->z_origin[0] ? zp->z_origin : ".");
#ifdef GEN_AXFR
fprintf(ddt, ", class = %d", zp->z_class);
#endif
fprintf(ddt, ", type = %s", zoneTypeString(zp));
if (zp->z_source)
fprintf(ddt,", source = %s\n", zp->z_source);
fprintf(ddt, "z_refresh = %lu", (u_long)zp->z_refresh);
fprintf(ddt, ", retry = %lu", (u_long)zp->z_retry);
fprintf(ddt, ", expire = %lu", (u_long)zp->z_expire);
fprintf(ddt, ", minimum = %lu", (u_long)zp->z_minimum);
fprintf(ddt, ", serial = %lu\n", (u_long)zp->z_serial);
fprintf(ddt, "z_time = %lu", (u_long)zp->z_time);
if (zp->z_time) {
fprintf(ddt, ", now time : %lu sec", (u_long)tt.tv_sec);
fprintf(ddt, ", time left: %lu sec",
(u_long)(zp->z_time - tt.tv_sec));
}
fprintf(ddt, "; flags %lx\n", (u_long)zp->z_flags);
}
#endif /* DEBUG */
/*
* remove_zone (htp, zone) --
* Delete all RR's in the zone "zone" under specified hash table.
*/
void
#ifdef CLEANCACHE
remove_zone(htp, zone, all)
#else
remove_zone(htp, zone)
#endif
register struct hashbuf *htp;
register int zone;
#ifdef CLEANCACHE
register int all;
#endif
{
register struct databuf *dp, *pdp;
register 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) {
for (pdp = NULL, dp = np->n_data; dp != NULL; NULL) {
if (dp->d_zone == zone
#ifdef CLEANCACHE
&& (all || stale(dp))
#endif
) {
dp = rm_datum(dp, np, pdp);
} else {
pdp = dp;
dp = dp->d_next;
}
} /*for(pdp)*/
if (np->n_hash) {
/* call recursively to remove subdomains. */
remove_zone(np->n_hash, zone
#ifdef CLEANCACHE
, all
#endif
);
/* if now empty, free it */
if (np->n_hash->h_cnt == 0) {
free((char*)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)*/
}
#ifdef PURGE_ZONE
static void purge_z_2 __P((struct hashbuf *, int));
static bottom_of_zone __P((struct databuf *, int));
void
purge_zone(dname, htp, class)
const char *dname;
register struct hashbuf *htp;
int class;
{
const char *fname;
struct databuf *dp, *pdp;
struct namebuf *np;
struct hashbuf *phtp = htp;
dprintf(1, (ddt, "purge_zone(%s,%d)\n", dname, class));
if ((np = nlookup(dname, &phtp, &fname, 0)) && dname == fname &&
!ns_wildcard(NAME(*np))) {
for (pdp = NULL, dp = np->n_data; dp != NULL; ) {
if (dp->d_class == class)
dp = rm_datum(dp, np, pdp);
else {
pdp = dp;
dp = dp->d_next;
}
}
if (np->n_hash) {
purge_z_2(np->n_hash, class);
if (np->n_hash->h_cnt == 0) {
free((char*)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;
dprintf(3,(ddt, "purge_zone: cleaning cache\n"));
/* 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) {
dprintf(3, (ddt,
"purge_zone: found our selves\n"
));
npn = rm_name(nnp,npp,pnp);
phtp->h_cnt--;
} else {
npn = nnp->n_next;
pnp = nnp;
}
}
}
}
}
}
}
static void
purge_z_2(htp, class)
register struct hashbuf *htp;
register int class;
{
register struct databuf *dp, *pdp;
register 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; ) {
if (dp->d_class == class)
dp = rm_datum(dp, np, pdp);
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) {
free((char*)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(dp, class)
struct databuf *dp;
int class;
{
for ( ; dp ; dp = dp->d_next) {
if (dp->d_class != class)
continue;
if (dp->d_zone == 0)
continue;
#ifdef NCACHE
if (dp->d_rcode) /* this should not occur */
continue;
#endif
if (dp->d_type == T_SOA)
return (1);
}
dprintf(3, (ddt, "bottom_of_zone() == 0\n"));
return (0);
}
#endif
/*
* Handle XFER limit for a nameserver.
*/
static int
nxfers(zp, delta)
struct zoneinfo *zp;
int delta;
{
struct in_addr nsa;
struct nameser *nsp;
int ret;
if (zp->z_xaddr.s_addr)
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(zp)
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)
syslog(LOG_WARNING,
"zone transfer timeout for \"%s\"; pid %lu missing",
zp->z_origin, (u_long)zp->z_xferpid);
else if (kill(zp->z_xferpid, SIGKILL) == -1)
syslog(LOG_WARNING,
"zone transfer timeout for \"%s\"; kill pid %lu: %m",
zp->z_origin, (u_long)zp->z_xferpid);
else
syslog(LOG_WARNING,
"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, SIGKILL) == -1) {
if (errno == ESRCH)
/* No warning on first time, it may have just exited */
zp->z_flags |= Z_XFER_GONE;
else {
syslog(LOG_WARNING,
"zone transfer timeout for \"%s\"; pid %lu kill failed %m",
zp->z_origin, (u_long)zp->z_xferpid);
zp->z_flags |= Z_XFER_ABORTED;
}
} else {
syslog(LOG_NOTICE,
"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.
* (Note: also called when outgoing transfer completes.)
*/
SIG_FN
reapchild()
{
int pid, i, save_errno;
#if defined(sequent)
union wait status;
#else
int status;
#endif /* sequent */
#if defined(MUST_REARM_SIGS)
(void)signal(SIGCLD, (SIG_FN (*)()) reapchild);
#endif
save_errno = errno;
gettime(&tt);
#if defined(USE_WAITPID)
while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
#else /* USE_WAITPID */
{
pid = wait(&status);
#endif /* USE_WAITPID */
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;
needendxfer++;
break;
}
}
}
errno = save_errno;
}
/*
* Finish processing of of finished xfers
*/
void
endxfer()
{
register struct zoneinfo *zp;
int exitstatus, pid, i;
#if defined(sequent)
union wait status;
#else
int status;
#endif /* sequent */
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);
dprintf(1, (ddt,
"\nendxfer: child %d zone %s returned status=%d termsig=%d\n",
pid, zp->z_origin, exitstatus,
WIFSIGNALED(status) ?WTERMSIG(status) :-1
)
);
if (WIFSIGNALED(status)) {
if (WTERMSIG(status) != SIGKILL) {
syslog(LOG_NOTICE,
"named-xfer exited with signal %d\n",
WTERMSIG(status));
}
ns_retrytime(zp, tt.tv_sec);
} else {
switch (exitstatus) {
case XFER_UPTODATE:
markUpToDate(zp);
break;
case XFER_SUCCESS:
/* XXX should incorporate loadxfer() */
zp->z_flags |= Z_NEED_RELOAD;
zp->z_flags &= ~Z_SYSLOGGED;
needzoneload++;
break;
case XFER_TIMEOUT:
if (!(zp->z_flags & Z_SYSLOGGED)) {
zp->z_flags |= Z_SYSLOGGED;
syslog(LOG_NOTICE,
"zoneref: Masters for secondary zone \"%s\" unreachable",
zp->z_origin);
}
ns_retrytime(zp, tt.tv_sec);
break;
default:
if (!(zp->z_flags & Z_SYSLOGGED)) {
zp->z_flags |= Z_SYSLOGGED;
syslog(LOG_NOTICE,
"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);
break;
}
break;
}
}
xferstatus[i].xfer_state = XFER_IDLE;
xferstatus[i].xfer_pid = 0;
}
releasesigchld();
tryxfer();
}
/*
* Try to start some xfers - new "fair scheduler" by Bob Heiney @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)
syslog(LOG_INFO, "zones changed: %p != %p",
lastzones, zones);
lastzones = zones;
zp = zones;
}
/* did zones shrink? */
if (lastnzones > nzones) {
syslog(LOG_INFO, "zones shrunk");
zp = zones;
}
lastnzones = nzones;
if (zp == zones)
stopzp = &zones[nzones-1];
else
stopzp = zp - 1;
dprintf(3, (ddt, "tryxfer start zp=%p stopzp=%p def=%d running=%d\n",
zp, stopzp, xfers_deferred, xfers_running));
startzp = zp;
for (;;) {
int xfers;
if (!xfers_deferred || xfers_running >= max_xfers_running)
break;
if ((xfers = nxfers(zp, 0)) != -1 &&
xfers < max_xfers_per_ns &&
(zp->z_flags & Z_NEED_XFER)) {
nxfers(zp, 1);
xfers_deferred--;
startxfer(zp);
}
if (zp == stopzp) {
dprintf(3, (ddt, "tryxfer stop mark\n"));
zp = startzp;
break;
}
zp++;
/* wrap around? */
if (zp == &zones[nzones])
zp = zones;
}
dprintf(3, (ddt, "tryxfer stop zp=%p\n", zp));
if (!needmaint)
sched_maint();
}
/*
* Reload zones whose transfers have completed.
*/
void
loadxfer() {
register struct zoneinfo *zp;
gettime(&tt);
for (zp = zones; zp < &zones[nzones]; zp++) {
if (zp->z_flags & Z_NEED_RELOAD) {
dprintf(1, (ddt, "loadxfer() \"%s\"\n",
zp->z_origin[0] ? zp->z_origin : "."));
zp->z_flags &= ~(Z_NEED_RELOAD|Z_AUTH);
remove_zone(hashtab, zp - zones
#ifdef CLEANCACHE
, 1
#endif
);
#ifdef PURGE_ZONE
purge_zone(zp->z_origin, hashtab, zp->z_class);
#endif
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);
}
}
if (!needmaint)
sched_maint();
}
/*
* Add this zone to the set of those needing transfers.
*/
static void
addxfer(zp)
struct zoneinfo *zp;
{
if (!(zp->z_flags & Z_NEED_XFER)) {
zp->z_flags |= Z_NEED_XFER;
xfers_deferred++;
tryxfer();
}
}
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