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HardenedBSD/usr.sbin/named/ns_main.c
Peter Wemm a58206b6ea Merge in 4.9.3-P1 changes and bump version number. 
(Patch1 only affects named and BSD/OS makefiles that we dont use)
1996-01-22 05:55:52 +00:00

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#if !defined(lint) && !defined(SABER)
static char sccsid[] = "@(#)ns_main.c 4.55 (Berkeley) 7/1/91";
static char rcsid[] = "$Id: ns_main.c,v 1.6 1996/01/07 05:48:33 peter Exp $";
#endif /* not lint */
/*
* ++Copyright++ 1986, 1989, 1990
* -
* Copyright (c) 1986, 1989, 1990
* 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--
*/
#if !defined(lint) && !defined(SABER)
char copyright[] =
"@(#) Copyright (c) 1986, 1989, 1990 The Regents of the University of California.\n\
portions Copyright (c) 1993 Digital Equipment Corporation\n\
portions Copyright (c) 1995 Internet Software Consortium\n\
All rights reserved.\n";
#endif /* not lint */
/*
* Internet Name server (see RCF1035 & others).
*/
#include <sys/param.h>
#include <sys/file.h>
#include <sys/stat.h>
#if !defined(SYSV) && defined(XXX)
#include <sys/wait.h>
#endif /* !SYSV */
#if defined(__osf__)
# define _SOCKADDR_LEN /* XXX - should be in portability.h but that
* would need to be included before socket.h
*/
#endif
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#if defined(__osf__)
# include <sys/mbuf.h>
# include <net/route.h>
#endif
#if defined(_AIX)
# include <sys/time.h>
# define TIME_H_INCLUDED
#endif
#include <net/if.h>
#include <arpa/nameser.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <stdio.h>
#include <syslog.h>
#include <errno.h>
#include <signal.h>
#include <netdb.h>
#include <resolv.h>
#if defined(SVR4)
# include <sys/sockio.h>
#endif
#define MAIN_PROGRAM
#include "named.h"
#undef MAIN_PROGRAM
#undef nsaddr
/* UDP receive, TCP send buffer size */
static const int rbufsize = 8 * 1024,
/* TCP send window size */
sbufsize = 16 * 1024;
static struct sockaddr_in nsaddr;
static u_int16_t local_ns_port, /* our service port */
nsid_state;
static fd_set mask; /* open descriptors */
#ifdef OLD_SETPROCTITLE
static char **Argv = NULL;
static char *LastArg = NULL; /* end of argv */
#endif
static struct qstream *sqadd __P((void));
static void sq_query __P((struct qstream *)),
opensocket __P((struct qdatagram *)),
#ifdef DEBUG
printnetinfo __P((struct netinfo *)),
#endif
setdebug __P((int));
static int sq_here __P((struct qstream *));
static SIG_FN onintr __P(()),
maint_alarm __P(()),
setdumpflg __P(()),
onhup __P(()),
#if defined(QRYLOG) && defined(SIGWINCH)
setQrylogFlg __P(()),
#endif
setIncrDbgFlg __P(()),
setNoDbgFlg __P(()),
#ifdef SIGSYS
sigprof __P(()),
#endif /* SIGSYS */
setchkptflg __P(()),
setstatsflg __P(());
static void
usage()
{
fprintf(stderr,
"Usage: named [-d #] [-q] [-r] [-p port[/localport]] [[-b] bootfile]\n");
exit(1);
}
/*ARGSUSED*/
void
main(argc, argv, envp)
int argc;
char *argv[], *envp[];
{
register int n, udpcnt;
register char *arg;
register struct qstream *sp;
register struct qdatagram *dqp;
struct qstream *nextsp;
int nfds;
const int on = 1;
int rfd, size, len;
time_t lasttime, maxctime;
u_char buf[BUFSIZ];
#ifdef POSIX_SIGNALS
struct sigaction sact;
#else
#ifndef SYSV
struct sigvec vec;
#endif
#endif
#ifdef NeXT
int old_sigmask;
#endif
fd_set tmpmask;
struct timeval t, *tp;
struct qstream *candidate = QSTREAM_NULL;
char **argp;
#ifdef PID_FIX
char oldpid[10];
#endif
#ifdef WANT_PIDFILE
FILE *fp; /* file descriptor for pid file */
#endif
#ifdef IP_OPTIONS
u_char ip_opts[50]; /* arbitrary size */
#endif
local_ns_port = ns_port = htons(NAMESERVER_PORT);
/* BSD has a better random number generator but it's not clear
* that we need it here.
*/
gettime(&tt);
srand(((unsigned)getpid()) + (unsigned)tt.tv_usec);
#ifdef OLD_SETPROCTITLE
/*
** Save start and extent of argv for ns_setproctitle().
*/
Argv = argp = argv;
while (*argp)
argp++;
LastArg = argp[-1] + strlen(argp[-1]);
#endif
(void) umask(022);
/* XXX - should use getopt here */
while (--argc > 0) {
arg = *++argv;
if (*arg == '-') {
while (*++arg)
switch (*arg) {
case 'b':
if (--argc <= 0)
usage();
bootfile = savestr(*++argv);
break;
case 'd':
++argv;
if (*argv != 0) {
if (**argv == '-') {
argv--;
break;
}
#ifdef DEBUG
debug = atoi(*argv);
#endif
--argc;
}
#ifdef DEBUG
if (debug <= 0)
debug = 1;
setdebug(1);
#endif
break;
case 'p':
/* use nonstandard port number.
* usage: -p remote/local
* remote is the port number to which
* we send queries. local is the port
* on which we listen for queries.
* local defaults to same as remote.
*/
if (--argc <= 0)
usage();
ns_port = htons((u_int16_t)
atoi(*++argv));
{
char *p = strchr(*argv, '/');
if (p) {
local_ns_port =
htons((u_int16_t)
atoi(p+1));
} else {
local_ns_port = ns_port;
}
}
break;
#ifdef QRYLOG
case 'q':
qrylog = 1;
break;
#endif
case 'r':
NoRecurse = 1;
break;
default:
usage();
}
} else
bootfile = savestr(*argv);
}
#ifdef DEBUG
if (!debug)
#endif
for (n = getdtablesize() - 1; n > 2; n--)
(void) close(n); /* don't use my_close() here */
#ifdef DEBUG
else {
fprintf(ddt, "Debug turned ON, Level %d\n",debug);
fprintf(ddt, "Version = %s\n", Version);
fprintf(ddt, "bootfile = %s\n", bootfile);
}
#endif
n = 0;
#if defined(DEBUG) && defined(LOG_PERROR)
if (debug)
n = LOG_PERROR;
#endif
#ifdef LOG_DAEMON
openlog("named", LOG_PID|LOG_CONS|LOG_NDELAY|n, LOGFAC);
#else
openlog("named", LOG_PID);
#endif
#ifdef WANT_PIDFILE
/* tuck my process id away */
#ifdef PID_FIX
fp = fopen(PidFile, "r+");
if (fp != NULL) {
(void) fgets(oldpid, sizeof(oldpid), fp);
(void) rewind(fp);
fprintf(fp, "%ld\n", (long)getpid());
(void) my_fclose(fp);
}
#else /*PID_FIX*/
fp = fopen(PidFile, "w");
if (fp != NULL) {
fprintf(fp, "%d\n", getpid());
(void) my_fclose(fp);
}
#endif /*PID_FIX*/
#endif /*WANT_PIDFILE*/
syslog(LOG_NOTICE, "starting. %s", Version);
_res.options &= ~(RES_DEFNAMES | RES_DNSRCH | RES_RECURSE);
nsaddr.sin_family = AF_INET;
nsaddr.sin_addr.s_addr = INADDR_ANY;
nsaddr.sin_port = local_ns_port;
nsid_init();
/*
** Open stream port.
*/
for (n = 0; ; n++) {
if ((vs = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
syslog(LOG_ERR, "socket(SOCK_STREAM): %m");
exit(1);
}
if (setsockopt(vs, SOL_SOCKET, SO_REUSEADDR, (char *)&on,
sizeof(on)) != 0)
{
syslog(LOG_NOTICE, "setsockopt(vs, reuseaddr): %m");
(void) my_close(vs);
continue;
}
if (bind(vs, (struct sockaddr *)&nsaddr, sizeof(nsaddr)) == 0)
break;
if (errno != EADDRINUSE || n > 4) {
if (errno == EADDRINUSE) {
syslog(LOG_NOTICE,
"There may be a name server already running");
syslog(LOG_ERR, "exiting");
} else {
syslog(LOG_ERR, "bind(vs, [%s].%d): %m",
inet_ntoa(nsaddr.sin_addr),
ntohs(nsaddr.sin_port));
}
#if defined(WANT_PIDFILE) && defined(PID_FIX)
/* put old pid back */
if (atoi(oldpid) && (fp = fopen(PidFile, "w"))) {
fprintf(fp, "%s", oldpid);
(void) my_fclose(fp);
_exit(1);
}
#endif /*WANT_PIDFILE && PID_FIX*/
exit(1);
}
/* Retry opening the socket a few times */
my_close(vs);
sleep(3);
}
if (listen(vs, 5) != 0) {
syslog(LOG_ERR, "listen(vs, 5): %m");
exit(1);
}
/*
* named would be terminated if one of these is sent and no handler.
*/
setsignal(SIGINT, -1, setdumpflg);
setsignal(SIGQUIT, -1, setchkptflg);
setsignal(SIGIOT, -1, setstatsflg);
setsignal(SIGUSR1, -1, setIncrDbgFlg);
setsignal(SIGUSR2, -1, setNoDbgFlg);
#if defined(SIGWINCH) && defined(QRYLOG)
setsignal(SIGWINCH, -1, setQrylogFlg);
#endif
/*
* Get list of local addresses and set up datagram sockets.
*/
FD_ZERO(&mask);
FD_SET(vs, &mask);
getnetconf();
/*
** Initialize and load database.
*/
gettime(&tt);
buildservicelist();
buildprotolist();
ns_init(bootfile);
#ifdef DEBUG
if (debug) {
fprintf(ddt, "Network and sort list:\n");
printnetinfo(nettab);
}
#endif
time(&boottime);
resettime = boottime;
setsignal(SIGALRM, SIGCHLD, maint_alarm);
setsignal(SIGCHLD, SIGALRM, reapchild);
setsignal(SIGPIPE, -1, (SIG_FN (*)())SIG_IGN);
setsignal(SIGHUP, -1, onhup);
#if defined(SIGXFSZ)
/* Wierd DEC Hesiodism, harmless. */
setsignal(SIGXFSZ, -1, onhup);
#endif
#ifdef SIGSYS
setsignal(SIGSYS, -1, sigprof);
#endif /* SIGSYS */
#ifdef ALLOW_UPDATES
/* Catch SIGTERM so we can dump the database upon shutdown if it
has changed since it was last dumped/booted */
setsignal(SIGTERM, -1, onintr);
#endif
#ifdef XSTATS
/* Catch SIGTERM so we can write stats before exiting. */
setsignal(SIGTERM, -1, onintr);
#endif
dprintf(1, (ddt, "database initialized\n"));
t.tv_usec = 0;
/*
* Fork and go into background now that
* we've done any slow initialization
* and are ready to answer queries.
*/
#ifdef USE_SETSID
if (
#ifdef DEBUG
!debug ||
#endif
!isatty(0)) {
if (fork() > 0)
exit(0);
setsid();
#ifdef DEBUG
if (!debug)
#endif
{
n = open(_PATH_DEVNULL, O_RDONLY);
(void) dup2(n, 0);
(void) dup2(n, 1);
(void) dup2(n, 2);
if (n > 2)
(void) my_close(n);
}
}
#else
#ifdef DEBUG
if (!debug)
#endif
{
#ifdef HAVE_DAEMON
daemon(1, 0);
#else
switch (fork()) {
case -1:
syslog(LOG_ERR, "fork: %m");
exit(1);
/*FALLTHROUGH*/
case 0:
/* child */
break;
default:
/* parent */
exit(0);
}
n = open(_PATH_DEVNULL, O_RDONLY);
(void) dup2(n, 0);
(void) dup2(n, 1);
(void) dup2(n, 2);
if (n > 2)
(void) my_close(n);
#if defined(SYSV) || defined(hpux)
setpgrp();
#else
{
struct itimerval ival;
/*
* The open below may hang on pseudo ttys if the person
* who starts named logs out before this point.
*
* needmaint may get set inapropriately if the open
* hangs, but all that will happen is we will see that
* no maintenance is required.
*/
bzero((char *)&ival, sizeof(ival));
ival.it_value.tv_sec = 120;
(void) setitimer(ITIMER_REAL, &ival,
(struct itimerval *)NULL);
n = open(_PATH_TTY, O_RDWR);
ival.it_value.tv_sec = 0;
(void) setitimer(ITIMER_REAL, &ival,
(struct itimerval *)NULL);
if (n > 0) {
(void) ioctl(n, TIOCNOTTY, (char *)NULL);
(void) my_close(n);
}
}
#endif /* SYSV */
#endif /* HAVE_DAEMON */
}
#endif /* USE_SETSID */
#ifdef WANT_PIDFILE
/* tuck my process id away again */
fp = fopen(PidFile, "w");
if (fp != NULL) {
fprintf(fp, "%ld\n", (long)getpid());
(void) my_fclose(fp);
}
#endif
syslog(LOG_NOTICE, "Ready to answer queries.\n");
prime_cache();
nfds = getdtablesize(); /* get the number of file descriptors */
if (nfds > FD_SETSIZE) {
nfds = FD_SETSIZE; /* Bulletproofing */
syslog(LOG_NOTICE, "Return from getdtablesize() > FD_SETSIZE");
}
#ifdef NeXT
old_sigmask = sigblock(sigmask(SIGCHLD));
#endif
for (;;) {
#ifdef DEBUG
if (ddt && debug == 0) {
fprintf(ddt,"Debug turned OFF\n");
(void) my_fclose(ddt);
ddt = 0;
}
#endif
#ifdef ALLOW_UPDATES
if (needToExit) {
struct zoneinfo *zp;
sigblock(~0); /*
* Block all blockable signals
* to ensure a consistant
* state during final dump
*/
dprintf(1, (ddt, "Received shutdown signal\n"));
for (zp = zones; zp < &zones[nzones]; zp++) {
if (zp->z_flags & Z_CHANGED)
zonedump(zp);
}
exit(0);
}
#endif /* ALLOW_UPDATES */
#ifdef XSTATS
if (needToExit) {
ns_logstats();
exit(0);
}
#endif /* XSTATS */
if (needreload) {
needreload = 0;
db_reload();
}
if (needStatsDump) {
needStatsDump = 0;
ns_stats();
}
if (needendxfer) {
holdsigchld();
needendxfer = 0; /* should be safe even if not held */
endxfer(); /* releases SIGCHLD */
}
releasesigchld();
if (needzoneload) {
needzoneload = 0;
loadxfer();
}
if (needmaint) {
needmaint = 0;
ns_maint();
}
if(needToChkpt) {
needToChkpt = 0;
doachkpt();
}
if(needToDoadump) {
needToDoadump = 0;
doadump();
}
/*
** Wait until a query arrives
*/
if (retryqp != NULL) {
gettime(&tt);
/*
** The tv_sec field might be unsigned
** and thus cannot be negative.
*/
if ((int32_t) retryqp->q_time <= tt.tv_sec) {
retry(retryqp);
continue;
}
t.tv_sec = (int32_t) retryqp->q_time - tt.tv_sec;
tp = &t;
} else
tp = NULL;
tmpmask = mask;
#ifdef NeXT
sigsetmask(old_sigmask); /* Let queued signals run. */
#endif
n = select(nfds, &tmpmask, (fd_set *)NULL, (fd_set *)NULL, tp);
#ifdef NeXT
old_sigmask = sigblock(sigmask(SIGCHLD));
#endif
if (n < 0 && errno != EINTR) {
syslog(LOG_ERR, "select: %m");
sleep(60);
}
if (n <= 0)
continue;
for (dqp = datagramq;
dqp != QDATAGRAM_NULL;
dqp = dqp->dq_next) {
if (FD_ISSET(dqp->dq_dfd, &tmpmask))
for (udpcnt = 0; udpcnt < 42; udpcnt++) { /*XXX*/
int from_len = sizeof(from_addr);
if ((n = recvfrom(dqp->dq_dfd, (char *)buf,
MIN(PACKETSZ, sizeof buf), 0,
(struct sockaddr *)&from_addr, &from_len)) < 0)
{
#if defined(SPURIOUS_ECONNREFUSED)
if ((n < 0) && (errno == ECONNREFUSED))
break;
#endif
if ((n < 0) && (errno == PORT_WOULDBLK))
break;
syslog(LOG_INFO, "recvfrom: %m");
break;
}
if (n == 0)
break;
gettime(&tt);
dprintf(1, (ddt,
"\ndatagram from [%s].%d, fd %d, len %d; now %s",
inet_ntoa(from_addr.sin_addr),
ntohs(from_addr.sin_port),
dqp->dq_dfd, n,
ctimel(tt.tv_sec)));
#ifdef DEBUG
if (debug >= 10)
fp_nquery(buf, n, ddt);
#endif
/*
* Consult database to get the answer.
*/
gettime(&tt);
ns_req(buf, n, PACKETSZ, QSTREAM_NULL, &from_addr,
dqp->dq_dfd);
}
}
/*
** Process stream connection.
**
** Note that a "continue" in here takes us back to the select()
** which, if our accept() failed, will bring us back here.
*/
if (FD_ISSET(vs, &tmpmask)) {
int from_len = sizeof(from_addr);
rfd = accept(vs,
(struct sockaddr *)&from_addr,
&from_len);
if (rfd < 0 && errno == EINTR)
continue;
if (rfd < 0 && errno == EMFILE && streamq) {
maxctime = 0;
candidate = NULL;
for (sp = streamq; sp; sp = nextsp) {
nextsp = sp->s_next;
if (sp->s_refcnt)
continue;
gettime(&tt);
lasttime = tt.tv_sec - sp->s_time;
if (lasttime >= VQEXPIRY)
sqrm(sp);
else if (lasttime > maxctime) {
candidate = sp;
maxctime = lasttime;
}
}
if (candidate)
sqrm(candidate);
continue;
}
if (rfd < 0) {
syslog(LOG_INFO, "accept: %m");
continue;
}
if ((n = fcntl(rfd, F_GETFL, 0)) < 0) {
syslog(LOG_INFO, "fcntl(rfd, F_GETFL): %m");
(void) my_close(rfd);
continue;
}
if (fcntl(rfd, F_SETFL, n|PORT_NONBLOCK) != 0) {
syslog(LOG_INFO, "fcntl(rfd, NONBLOCK): %m");
(void) my_close(rfd);
continue;
}
#if defined(IP_OPTIONS)
len = sizeof ip_opts;
if (getsockopt(rfd, IPPROTO_IP, IP_OPTIONS,
(char *)ip_opts, &len) < 0) {
syslog(LOG_INFO,
"getsockopt(rfd, IP_OPTIONS): %m");
(void) my_close(rfd);
continue;
}
if (len != 0) {
nameserIncr(from_addr.sin_addr, nssRcvdOpts);
if (!haveComplained((char*)
from_addr.sin_addr.s_addr,
"rcvd ip options")) {
syslog(LOG_INFO,
"rcvd IP_OPTIONS from [%s].%d (ignored)",
inet_ntoa(from_addr.sin_addr),
ntohs(from_addr.sin_port));
}
if (setsockopt(rfd, IPPROTO_IP, IP_OPTIONS,
NULL, 0) < 0) {
syslog(LOG_INFO,
"setsockopt(!IP_OPTIONS): %m");
(void) my_close(rfd);
continue;
}
}
#endif
if (setsockopt(rfd, SOL_SOCKET, SO_SNDBUF,
(char*)&sbufsize, sizeof(sbufsize)) < 0){
syslog(LOG_INFO,
"setsockopt(rfd, SO_SNDBUF, %d): %m",
sbufsize);
(void) my_close(rfd);
continue;
}
if (setsockopt(rfd, SOL_SOCKET, SO_KEEPALIVE,
(char *)&on, sizeof(on)) < 0) {
syslog(LOG_INFO,
"setsockopt(rfd, KEEPALIVE): %m");
(void) my_close(rfd);
continue;
}
if ((sp = sqadd()) == QSTREAM_NULL) {
(void) my_close(rfd);
continue;
}
sp->s_rfd = rfd; /* stream file descriptor */
sp->s_size = -1; /* amount of data to receive */
gettime(&tt);
sp->s_time = tt.tv_sec; /* last transaction time */
sp->s_from = from_addr; /* address to respond to */
sp->s_bufp = (u_char *)&sp->s_tempsize;
FD_SET(rfd, &mask);
FD_SET(rfd, &tmpmask);
dprintf(1, (ddt,
"\nTCP connection from [%s].%d (fd %d)\n",
inet_ntoa(sp->s_from.sin_addr),
ntohs(sp->s_from.sin_port), rfd));
}
if (streamq)
dprintf(3, (ddt, "streamq = 0x%lx\n",
(u_long)streamq));
for (sp = streamq; sp != QSTREAM_NULL; sp = nextsp) {
nextsp = sp->s_next;
if (!FD_ISSET(sp->s_rfd, &tmpmask))
continue;
dprintf(5, (ddt,
"sp x%lx rfd %d size %d time %d next x%lx\n",
(u_long)sp, sp->s_rfd, sp->s_size,
sp->s_time, (u_long)sp->s_next));
dprintf(5, (ddt,
"\tbufsize %d buf x%lx bufp x%lx\n",
sp->s_bufsize,
(u_long)sp->s_buf, (u_long)sp->s_bufp));
if (sp->s_size < 0) {
size = INT16SZ
- (sp->s_bufp - (u_char *)&sp->s_tempsize);
while (size > 0 &&
(n = read(sp->s_rfd, sp->s_bufp, size)) > 0
) {
sp->s_bufp += n;
size -= n;
}
if ((n < 0) && (errno == PORT_WOULDBLK))
continue;
if (n <= 0) {
sqrm(sp);
continue;
}
if ((sp->s_bufp - (u_char *)&sp->s_tempsize) ==
INT16SZ) {
sp->s_size = ntohs(sp->s_tempsize);
if (sp->s_bufsize == 0) {
if (!(sp->s_buf = (u_char *)
malloc(rbufsize))
) {
sp->s_buf = buf;
sp->s_size = sizeof(buf);
} else {
sp->s_bufsize = rbufsize;
}
}
if (sp->s_size > sp->s_bufsize &&
sp->s_bufsize != 0
) {
sp->s_buf = (u_char *)
realloc((char *)sp->s_buf,
(unsigned)sp->s_size);
if (sp->s_buf == NULL) {
sp->s_buf = buf;
sp->s_bufsize = 0;
sp->s_size = sizeof(buf);
} else {
sp->s_bufsize = sp->s_size;
}
}
sp->s_bufp = sp->s_buf;
}
}
gettime(&tt);
sp->s_time = tt.tv_sec;
while (sp->s_size > 0 &&
(n = read(sp->s_rfd,
sp->s_bufp,
sp->s_size)
) > 0
) {
sp->s_bufp += n;
sp->s_size -= n;
}
/*
* we don't have enough memory for the query.
* if we have a query id, then we will send an
* error back to the user.
*/
if (sp->s_bufsize == 0 &&
(sp->s_bufp - sp->s_buf > INT16SZ)) {
HEADER *hp;
hp = (HEADER *)sp->s_buf;
hp->qr = 1;
hp->ra = (NoRecurse == 0);
hp->ancount = 0;
hp->qdcount = 0;
hp->nscount = 0;
hp->arcount = 0;
hp->rcode = SERVFAIL;
(void) writemsg(sp->s_rfd, sp->s_buf,
HFIXEDSZ);
continue;
}
if ((n == -1) && (errno == PORT_WOULDBLK))
continue;
if (n <= 0) {
sqrm(sp);
continue;
}
/*
* Consult database to get the answer.
*/
if (sp->s_size == 0) {
nameserIncr(sp->s_from.sin_addr, nssRcvdTCP);
sq_query(sp);
ns_req(sp->s_buf,
sp->s_bufp - sp->s_buf,
sp->s_bufsize, sp,
&sp->s_from, -1);
/* ns_req() can call sqrm() - check for it */
if (sq_here(sp)) {
sp->s_bufp = (u_char *)&sp->s_tempsize;
sp->s_size = -1;
}
continue;
}
}
}
/* NOTREACHED */
}
void
getnetconf()
{
register struct netinfo *ntp;
struct netinfo *ontp;
struct ifconf ifc;
struct ifreq ifreq, *ifr;
struct qdatagram *dqp;
static int first = 1;
char buf[32768], *cp, *cplim;
u_int32_t nm;
time_t my_generation = time(NULL);
ifc.ifc_len = sizeof buf;
ifc.ifc_buf = buf;
if (ioctl(vs, SIOCGIFCONF, (char *)&ifc) < 0) {
syslog(LOG_ERR, "get interface configuration: %m - exiting");
exit(1);
}
ntp = NULL;
#if defined(AF_LINK) && !defined(RISCOS_BSD) && !defined(M_UNIX)
#define my_max(a, b) (a > b ? a : b)
#define my_size(p) my_max((p).sa_len, sizeof(p))
#else
#define my_size(p) (sizeof (p))
#endif
cplim = buf + ifc.ifc_len; /* skip over if's with big ifr_addr's */
for (cp = buf;
cp < cplim;
cp += sizeof (ifr->ifr_name) + my_size(ifr->ifr_addr)) {
#undef my_size
ifr = (struct ifreq *)cp;
if (ifr->ifr_addr.sa_family != AF_INET ||
((struct sockaddr_in *)
&ifr->ifr_addr)->sin_addr.s_addr == 0) {
continue;
}
ifreq = *ifr;
/*
* Don't test IFF_UP, packets may still be received at this
* address if any other interface is up.
*/
#if !defined(BSD) || (BSD < 199103)
if (ioctl(vs, SIOCGIFADDR, (char *)&ifreq) < 0) {
syslog(LOG_NOTICE, "get interface addr: %m");
continue;
}
#endif
dprintf(1, (ddt, "considering [%s]\n",
inet_ntoa(((struct sockaddr_in *)
&ifreq.ifr_addr)->sin_addr)));
/* build datagram queue */
/*
* look for an already existing source interface address.
* This happens mostly when reinitializing. Also, if
* the machine has multiple point to point interfaces, then
* the local address may appear more than once.
*/
if (dqp = aIsUs(((struct sockaddr_in *)&ifreq.ifr_addr)
->sin_addr)) {
dprintf(1, (ddt,
"dup interface address %s on %s\n",
inet_ntoa(((struct sockaddr_in *)
&ifreq.ifr_addr)->sin_addr),
ifreq.ifr_name));
dqp->dq_gen = my_generation;
continue;
}
/*
* Skip over address 0.0.0.0 since this will conflict
* with binding to wildcard address later. Interfaces
* which are not completely configured can have this addr.
*/
if (((struct sockaddr_in *)&ifreq.ifr_addr)->sin_addr.s_addr
== 0x00000000) { /* XXX */
dprintf(1, (ddt, "skipping address 0.0.0.0 on %s\n",
ifreq.ifr_name));
continue;
}
if ((dqp = (struct qdatagram *)
calloc(1, sizeof(struct qdatagram))
) == NULL) {
syslog(LOG_ERR, "getnetconf: malloc: %m");
exit(12);
}
dqp->dq_next = datagramq;
datagramq = dqp;
dqp->dq_addr = ((struct sockaddr_in *)
&ifreq.ifr_addr)->sin_addr;
dqp->dq_gen = my_generation;
opensocket(dqp);
dprintf(1, (ddt, "listening [%s]\n",
inet_ntoa(((struct sockaddr_in *)
&ifreq.ifr_addr)->sin_addr)));
/*
* Add interface to list of directly-attached (sub)nets
* for use in sorting addresses.
*/
if (ntp == NULL) {
ntp = (struct netinfo *)malloc(sizeof(struct netinfo));
if (!ntp)
panic(errno, "malloc(netinfo)");
}
ntp->my_addr = ((struct sockaddr_in *)
&ifreq.ifr_addr)->sin_addr;
#ifdef SIOCGIFNETMASK
if (ioctl(vs, SIOCGIFNETMASK, (char *)&ifreq) < 0) {
syslog(LOG_NOTICE, "get netmask: %m");
ntp->mask = net_mask(ntp->my_addr);
} else
ntp->mask = ((struct sockaddr_in *)
&ifreq.ifr_addr)->sin_addr.s_addr;
#else
/* 4.2 does not support subnets */
ntp->mask = net_mask(ntp->my_addr);
#endif
if (ioctl(vs, SIOCGIFFLAGS, (char *)&ifreq) < 0) {
syslog(LOG_NOTICE, "get interface flags: %m");
continue;
}
#ifdef IFF_LOOPBACK
if (ifreq.ifr_flags & IFF_LOOPBACK)
#else
/* test against 127.0.0.1 (yuck!!) */
if (ntp->my_addr.s_addr == inet_addr("127.0.0.1")) /* XXX */
#endif
{
if (netloop.my_addr.s_addr == 0) {
netloop.my_addr = ntp->my_addr;
netloop.mask = 0xffffffff;
netloop.addr = ntp->my_addr.s_addr;
dprintf(1, (ddt, "loopback address: x%lx\n",
netloop.my_addr.s_addr));
}
continue;
} else if ((ifreq.ifr_flags & IFF_POINTOPOINT)) {
if (ioctl(vs, SIOCGIFDSTADDR, (char *)&ifreq) < 0) {
syslog(LOG_NOTICE, "get dst addr: %m");
continue;
}
ntp->mask = 0xffffffff;
ntp->addr = ((struct sockaddr_in *)
&ifreq.ifr_addr)->sin_addr.s_addr;
} else {
ntp->addr = ntp->mask & ntp->my_addr.s_addr;
}
/*
* Place on end of list of locally-attached (sub)nets,
* but before logical nets for subnetted nets.
*/
ntp->next = *elocal;
*elocal = ntp;
if (elocal == enettab)
enettab = &ntp->next;
elocal = &ntp->next;
ntp = NULL;
}
if (ntp)
free((char *)ntp);
/*
* now go through the datagramq and delete anything that
* does not have the current generation number. this is
* how we catch interfaces that go away or change their
* addresses. note that 0.0.0.0 is the wildcard element
* and should never be deleted by this code.
*
* XXX - need to update enettab/elocal as well.
*/
dqflush(my_generation); /* With apologies to The Who. */
/*
* Create separate qdatagram structure for socket
* wildcard address.
*/
if (first) {
if (!(dqp = (struct qdatagram *)calloc(1, sizeof(*dqp))))
panic(errno, "malloc(qdatagram)");
dqp->dq_next = datagramq;
datagramq = dqp;
dqp->dq_addr.s_addr = INADDR_ANY;
opensocket(dqp);
ds = dqp->dq_dfd;
}
/*
* Compute logical networks to which we're connected
* based on attached subnets;
* used for sorting based on network configuration.
*/
for (ntp = nettab; ntp != NULL; ntp = ntp->next) {
nm = net_mask(ntp->my_addr);
if (nm != ntp->mask) {
if (findnetinfo(ntp->my_addr))
continue;
ontp = (struct netinfo *)
malloc(sizeof(struct netinfo));
if (!ontp)
panic(errno, "malloc(netinfo)");
ontp->my_addr = ntp->my_addr;
ontp->mask = nm;
ontp->addr = ontp->my_addr.s_addr & nm;
ontp->next = *enettab;
*enettab = ontp;
enettab = &ontp->next;
}
}
first = 0;
}
/*
* Find netinfo structure for logical network implied by address "addr",
* if it's on list of local/favored networks.
*/
struct netinfo *
findnetinfo(addr)
struct in_addr addr;
{
register struct netinfo *ntp;
u_int32_t net, mask;
mask = net_mask(addr);
net = addr.s_addr & mask;
for (ntp = nettab; ntp != NULL; ntp = ntp->next)
if (ntp->addr == net && ntp->mask == mask)
return (ntp);
return ((struct netinfo *) NULL);
}
#ifdef DEBUG
static void
printnetinfo(ntp)
register struct netinfo *ntp;
{
for ( ; ntp != NULL; ntp = ntp->next) {
fprintf(ddt, "addr x%lx mask x%lx",
(u_long)ntp->addr, (u_long)ntp->mask);
fprintf(ddt, " my_addr x%lx", ntp->my_addr.s_addr);
fprintf(ddt, " %s\n", inet_ntoa(ntp->my_addr));
}
}
#endif
static void
opensocket(dqp)
register struct qdatagram *dqp;
{
int m, n;
int on = 1;
/*
* Open datagram sockets bound to interface address.
*/
if ((dqp->dq_dfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
syslog(LOG_ERR, "socket(SOCK_DGRAM): %m - exiting");
exit(1);
}
dprintf(1, (ddt, "dqp->dq_addr %s d_dfd %d\n",
inet_ntoa(dqp->dq_addr), dqp->dq_dfd));
if (setsockopt(dqp->dq_dfd, SOL_SOCKET, SO_REUSEADDR,
(char *)&on, sizeof(on)) != 0)
{
syslog(LOG_NOTICE, "setsockopt(dqp->dq_dfd, reuseaddr): %m");
/* XXX press on regardless, this is not too serious. */
}
#ifdef SO_RCVBUF
m = sizeof(n);
if ((getsockopt(dqp->dq_dfd, SOL_SOCKET, SO_RCVBUF, (char*)&n, &m) >= 0)
&& (m == sizeof(n))
&& (n < rbufsize)) {
(void) setsockopt(dqp->dq_dfd, SOL_SOCKET, SO_RCVBUF,
(char *)&rbufsize, sizeof(rbufsize));
}
#endif /* SO_RCVBUF */
if ((n = fcntl(dqp->dq_dfd, F_GETFL, 0)) < 0) {
syslog(LOG_NOTICE, "fcntl(dfd, F_GETFL): %m");
/* XXX press on regardless, but this really is a problem. */
} else if (fcntl(dqp->dq_dfd, F_SETFL, n|PORT_NONBLOCK) != 0) {
syslog(LOG_NOTICE, "fcntl(dqp->dq_dfd, non-blocking): %m");
/* XXX press on regardless, but this really is a problem. */
}
/*
* NOTE: Some versions of SunOS have problems with the following
* call to bind. Bind still seems to function on these systems
* if you comment out the exit inside the if. This may cause
* Suns with multiple interfaces to reply strangely.
*/
nsaddr.sin_addr = dqp->dq_addr;
if (bind(dqp->dq_dfd, (struct sockaddr *)&nsaddr, sizeof(nsaddr))) {
syslog(LOG_NOTICE, "bind(dfd=%d, [%s].%d): %m",
dqp->dq_dfd, inet_ntoa(nsaddr.sin_addr),
ntohs(nsaddr.sin_port));
#if !defined(sun)
syslog(LOG_ERR, "exiting");
exit(1);
#endif
}
FD_SET(dqp->dq_dfd, &mask);
}
/*
** Set flag saying to reload database upon receiving SIGHUP.
** Must make sure that someone isn't walking through a data
** structure at the time.
*/
static SIG_FN
onhup()
{
int save_errno = errno;
resignal(SIGHUP, -1, onhup);
needreload = 1;
errno = save_errno;
}
/*
** Set flag saying to call ns_maint()
** Must make sure that someone isn't walking through a data
** structure at the time.
*/
static SIG_FN
maint_alarm()
{
int save_errno = errno;
resignal(SIGALRM, SIGCHLD, maint_alarm);
needmaint = 1;
errno = save_errno;
}
#ifdef ALLOW_UPDATES
/*
* Signal handler to schedule shutdown. Just set flag, to ensure a consistent
* state during dump.
*/
static SIG_FN
onintr()
{
int save_errno = errno;
resignal(SIGTERM, -1, onintr);
needToExit = 1;
errno = save_errno;
}
#endif /* ALLOW_UPDATES */
#ifdef XSTATS
/*
* Signal handler to write log information
*/
static SIG_FN
onintr()
{
int save_errno = errno;
resignal(SIGTERM, -1, onintr);
needToExit = 1; /* XXX variable reuse */
errno = save_errno;
}
#endif /* XSTATS */
/*
* Signal handler to schedule a data base dump. Do this instead of dumping the
* data base immediately, to avoid seeing it in a possibly inconsistent state
* (due to updates), and to avoid long disk I/O delays at signal-handler
* level
*/
static SIG_FN
setdumpflg()
{
int save_errno = errno;
resignal(SIGINT, -1, setdumpflg);
needToDoadump = 1;
errno = save_errno;
}
/*
** Turn on or off debuging by open or closeing the debug file
*/
static void
setdebug(code)
int code;
{
#if defined(lint) && !defined(DEBUG)
code = code;
#endif
#ifdef DEBUG
if (code) {
int n;
ddt = freopen(debugfile, "w+", stderr);
if ( ddt == NULL) {
syslog(LOG_NOTICE, "can't open debug file %s: %m",
debugfile);
debug = 0;
} else {
#if defined(HAVE_SETVBUF)
setvbuf(ddt, NULL, _IOLBF, BUFSIZ);
#else
setlinebuf(ddt);
#endif
if ((n = fcntl(fileno(ddt), F_GETFL, 0)) < 0) {
syslog(LOG_INFO,
"fcntl(ddt, F_GETFL): %m");
} else {
(void) fcntl(fileno(ddt), F_SETFL, n|O_APPEND);
}
}
} else
debug = 0;
/* delay closing ddt, we might interrupt someone */
#endif
}
/*
** Catch a special signal and set debug level.
**
** If debuging is off then turn on debuging else increment the level.
**
** Handy for looking in on long running name servers.
*/
static SIG_FN
setIncrDbgFlg()
{
int save_errno = errno;
resignal(SIGUSR1, -1, setIncrDbgFlg);
#ifdef DEBUG
if (debug == 0) {
debug++;
setdebug(1);
} else {
debug++;
}
if (debug)
fprintf(ddt, "Debug turned ON, Level %d\n", debug);
#endif
errno = save_errno;
}
/*
** Catch a special signal to turn off debugging
*/
static SIG_FN
setNoDbgFlg()
{
int save_errno = errno;
resignal(SIGUSR2, -1, setNoDbgFlg);
setdebug(0);
errno = save_errno;
}
#if defined(QRYLOG) && defined(SIGWINCH)
/*
** Set flag for query logging
*/
static SIG_FN
setQrylogFlg()
{
int save_errno = errno;
resignal(SIGWINCH, -1, setQrylogFlg);
qrylog = !qrylog;
syslog(LOG_NOTICE, "query log %s\n", qrylog ?"on" :"off");
errno = save_errno;
}
#endif /*QRYLOG && SIGWINCH*/
/*
** Set flag for statistics dump
*/
static SIG_FN
setstatsflg()
{
int save_errno = errno;
resignal(SIGIOT, -1, setstatsflg);
needStatsDump = 1;
errno = save_errno;
}
static SIG_FN
setchkptflg()
{
int save_errno = errno;
resignal(SIGQUIT, -1, setchkptflg);
needToChkpt = 1;
errno = save_errno;
}
/*
** Catch a special signal SIGSYS
**
** this is setup to fork and exit to drop to /usr/tmp/gmon.out
** and keep the server running
*/
#ifdef SIGSYS
static SIG_FN
sigprof()
{
int save_errno = errno;
resignal(SIGSYS, -1, sigprof);
dprintf(1, (ddt, "sigprof()\n"));
if (fork() == 0)
{
(void) chdir(_PATH_TMPDIR);
exit(1);
}
errno = save_errno;
}
#endif /* SIGSYS */
/*
** Routines for managing stream queue
*/
static struct qstream *
sqadd()
{
register struct qstream *sqp;
if (!(sqp = (struct qstream *)calloc(1, sizeof(struct qstream)))) {
syslog(LOG_ERR, "sqadd: calloc: %m");
return (QSTREAM_NULL);
}
dprintf(3, (ddt, "sqadd(x%lx)\n", (u_long)sqp));
sqp->s_next = streamq;
streamq = sqp;
return (sqp);
}
/* sqrm(qp)
* remove stream queue structure `qp'.
* no current queries may refer to this stream when it is removed.
* side effects:
* memory is deallocated. sockets are closed. lists are relinked.
*/
void
sqrm(qp)
register struct qstream *qp;
{
register struct qstream *qsp;
dprintf(2, (ddt, "sqrm(%#lx, %d) rfcnt=%d\n",
(u_long)qp, qp->s_rfd, qp->s_refcnt));
if (qp->s_bufsize != 0)
free(qp->s_buf);
FD_CLR(qp->s_rfd, &mask);
(void) my_close(qp->s_rfd);
if (qp == streamq) {
streamq = qp->s_next;
} else {
for (qsp = streamq;
qsp && (qsp->s_next != qp);
qsp = qsp->s_next)
;
if (qsp) {
qsp->s_next = qp->s_next;
}
}
free((char *)qp);
}
/* void
* sqflush(allbut)
* call sqrm() on all open streams except `allbut'
* side effects:
* global list `streamq' modified
* idiocy:
* is N^2 due to the scan inside of sqrm()
*/
void
sqflush(allbut)
register struct qstream *allbut;
{
register struct qstream *sp, *spnext;
for (sp = streamq; sp != NULL; sp = spnext) {
spnext = sp->s_next;
if (sp != allbut)
sqrm(sp);
}
}
/* void
* dqflush(gen)
* close/deallocate all the udp sockets, unless `gen' != (time_t)0
* in which case all those not from this generation (except 0.0.0.0)
* will be deleted, and syslog() will be called.
* known bugs:
* the above text is impenetrable.
* side effects:
* global list `datagramq' is modified.
*/
void
dqflush(gen)
register time_t gen;
{
register struct qdatagram *this, *prev, *next;
prev = NULL;
for (this = datagramq; this != NULL; this = next) {
next = this->dq_next;
if (gen != (time_t)0) {
if (this->dq_addr.s_addr == INADDR_ANY ||
this->dq_gen == gen) {
prev = this;
continue;
}
syslog(LOG_NOTICE, "interface [%s] missing; deleting",
inet_ntoa(this->dq_addr));
}
FD_CLR(this->dq_dfd, &mask);
my_close(this->dq_dfd);
free(this);
if (prev == NULL)
datagramq = next;
else
prev->dq_next = next;
}
}
/* int
* sq_here(sp)
* determine whether stream 'sp' is still on the streamq
* return:
* boolean: is it here?
*/
static int
sq_here(sp)
register struct qstream *sp;
{
register struct qstream *t;
for (t = streamq; t != NULL; t = t->s_next)
if (t == sp)
return (1);
return (0);
}
/*
* Initiate query on stream;
* mark as referenced and stop selecting for input.
*/
static void
sq_query(sp)
register struct qstream *sp;
{
sp->s_refcnt++;
FD_CLR(sp->s_rfd, &mask);
}
/*
* Note that the current request on a stream has completed,
* and that we should continue looking for requests on the stream.
*/
void
sq_done(sp)
register struct qstream *sp;
{
sp->s_refcnt = 0;
sp->s_time = tt.tv_sec;
FD_SET(sp->s_rfd, &mask);
}
#ifdef OLD_SETPROCTITLE
void
ns_setproctitle(a, s)
char *a;
int s;
{
int size;
register char *cp;
struct sockaddr_in sin;
char buf[80];
cp = Argv[0];
size = sizeof(sin);
if (getpeername(s, (struct sockaddr *)&sin, &size) == 0)
(void) sprintf(buf, "-%s [%s]", a, inet_ntoa(sin.sin_addr));
else {
syslog(LOG_DEBUG, "getpeername: %m");
(void) sprintf(buf, "-%s", a);
}
(void) strncpy(cp, buf, LastArg - cp);
cp += strlen(cp);
while (cp < LastArg)
*cp++ = ' ';
}
#else
void
ns_setproctitle(a, s)
char *a;
int s;
{
int size;
struct sockaddr_in sin;
char buf[80];
size = sizeof(sin);
if (getpeername(s, (struct sockaddr *)&sin, &size) == 0)
(void) sprintf(buf, "%s [%s]", a, inet_ntoa(sin.sin_addr));
else {
syslog(LOG_DEBUG, "getpeername: %m");
(void) sprintf(buf, "%s", a);
}
setproctitle("%s", buf);
}
#endif
u_int32_t
net_mask(in)
struct in_addr in;
{
register u_int32_t i = ntohl(in.s_addr);
if (IN_CLASSA(i))
return (htonl(IN_CLASSA_NET));
else if (IN_CLASSB(i))
return (htonl(IN_CLASSB_NET));
else
return (htonl(IN_CLASSC_NET));
}
/*
* These are here in case we ever want to get more clever, like perhaps
* using a bitmap to keep track of outstanding queries and a random
* allocation scheme to make it a little harder to predict them. Note
* that the resolver will need the same protection so the cleverness
* should be put there rather than here; this is just an interface layer.
*/
void
nsid_init()
{
nsid_state = res_randomid();
}
u_int16_t
nsid_next()
{
if (nsid_state == 65535)
nsid_state = 0;
else
nsid_state++;
return (nsid_state);
}
#if defined(BSD43_BSD43_NFS)
/* junk needed for old Sun NFS licensees */
#undef dn_skipname
extern char *dn_skipname();
char *(*hack_skipname)() = dn_skipname;
#endif
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