NetBSD/sbin/routed/main.c

345 lines
8.8 KiB
C

/*
* Copyright (c) 1983, 1988 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.
*/
#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1983, 1988 Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)main.c 5.23 (Berkeley) 7/1/91";
static char rcsid[] = "$Header: /cvsroot/src/sbin/routed/main.c,v 1.3 1993/03/23 00:30:31 cgd Exp $";
#endif /* not lint */
/*
* Routing Table Management Daemon
*/
#include "defs.h"
#include <sys/ioctl.h>
#include <sys/file.h>
#include <net/if.h>
#include <sys/errno.h>
#include <sys/signal.h>
#include <sys/syslog.h>
#include "pathnames.h"
int supplier = -1; /* process should supply updates */
int gateway = 0; /* 1 if we are a gateway to parts beyond */
int debug = 0;
int bufspace = 127*1024; /* max. input buffer size to request */
struct rip *msg = (struct rip *)packet;
void hup(), rtdeleteall(), sigtrace(), timer();
main(argc, argv)
int argc;
char *argv[];
{
int n, cc, nfd, omask, tflags = 0;
struct sockaddr from;
struct timeval *tvp, waittime;
struct itimerval itval;
register struct rip *query = msg;
fd_set ibits;
u_char retry;
argv0 = argv;
#if BSD >= 43
openlog("routed", LOG_PID | LOG_ODELAY, LOG_DAEMON);
setlogmask(LOG_UPTO(LOG_WARNING));
#else
openlog("routed", LOG_PID);
#define LOG_UPTO(x) (x)
#define setlogmask(x) (x)
#endif
sp = getservbyname("router", "udp");
if (sp == NULL) {
fprintf(stderr, "routed: router/udp: unknown service\n");
exit(1);
}
addr.sin_family = AF_INET;
addr.sin_port = sp->s_port;
s = getsocket(AF_INET, SOCK_DGRAM, &addr);
if (s < 0)
exit(1);
argv++, argc--;
while (argc > 0 && **argv == '-') {
if (strcmp(*argv, "-s") == 0) {
supplier = 1;
argv++, argc--;
continue;
}
if (strcmp(*argv, "-q") == 0) {
supplier = 0;
argv++, argc--;
continue;
}
if (strcmp(*argv, "-t") == 0) {
tflags++;
setlogmask(LOG_UPTO(LOG_DEBUG));
argv++, argc--;
continue;
}
if (strcmp(*argv, "-d") == 0) {
debug++;
setlogmask(LOG_UPTO(LOG_DEBUG));
argv++, argc--;
continue;
}
if (strcmp(*argv, "-g") == 0) {
gateway = 1;
argv++, argc--;
continue;
}
fprintf(stderr,
"usage: routed [ -s ] [ -q ] [ -t ] [ -g ]\n");
exit(1);
}
if (debug == 0)
daemon(0, 0);
/*
* Any extra argument is considered
* a tracing log file.
*/
if (argc > 0)
traceon(*argv);
while (tflags-- > 0)
bumploglevel();
(void) gettimeofday(&now, (struct timezone *)NULL);
/*
* Collect an initial view of the world by
* checking the interface configuration and the gateway kludge
* file. Then, send a request packet on all
* directly connected networks to find out what
* everyone else thinks.
*/
rtinit();
ifinit();
gwkludge();
if (gateway > 0)
rtdefault();
if (supplier < 0)
supplier = 0;
query->rip_cmd = RIPCMD_REQUEST;
query->rip_vers = RIPVERSION;
if (sizeof(query->rip_nets[0].rip_dst.sa_family) > 1) /* XXX */
query->rip_nets[0].rip_dst.sa_family = htons((u_short)AF_UNSPEC);
else
query->rip_nets[0].rip_dst.sa_family = AF_UNSPEC;
query->rip_nets[0].rip_metric = htonl((u_long)HOPCNT_INFINITY);
toall(sndmsg);
signal(SIGALRM, timer);
signal(SIGHUP, hup);
signal(SIGTERM, hup);
signal(SIGINT, rtdeleteall);
signal(SIGUSR1, sigtrace);
signal(SIGUSR2, sigtrace);
itval.it_interval.tv_sec = TIMER_RATE;
itval.it_value.tv_sec = TIMER_RATE;
itval.it_interval.tv_usec = 0;
itval.it_value.tv_usec = 0;
srandom(getpid());
if (setitimer(ITIMER_REAL, &itval, (struct itimerval *)NULL) < 0)
syslog(LOG_ERR, "setitimer: %m\n");
FD_ZERO(&ibits);
nfd = s + 1; /* 1 + max(fd's) */
for (;;) {
FD_SET(s, &ibits);
/*
* If we need a dynamic update that was held off,
* needupdate will be set, and nextbcast is the time
* by which we want select to return. Compute time
* until dynamic update should be sent, and select only
* until then. If we have already passed nextbcast,
* just poll.
*/
if (needupdate) {
waittime = nextbcast;
timevalsub(&waittime, &now);
if (waittime.tv_sec < 0) {
waittime.tv_sec = 0;
waittime.tv_usec = 0;
}
if (traceactions)
fprintf(ftrace,
"select until dynamic update %d/%d sec/usec\n",
waittime.tv_sec, waittime.tv_usec);
tvp = &waittime;
} else
tvp = (struct timeval *)NULL;
n = select(nfd, &ibits, 0, 0, tvp);
if (n <= 0) {
/*
* Need delayed dynamic update if select returned
* nothing and we timed out. Otherwise, ignore
* errors (e.g. EINTR).
*/
if (n < 0) {
if (errno == EINTR)
continue;
syslog(LOG_ERR, "select: %m");
}
omask = sigblock(sigmask(SIGALRM));
if (n == 0 && needupdate) {
if (traceactions)
fprintf(ftrace,
"send delayed dynamic update\n");
(void) gettimeofday(&now,
(struct timezone *)NULL);
toall(supply, RTS_CHANGED,
(struct interface *)NULL);
lastbcast = now;
needupdate = 0;
nextbcast.tv_sec = 0;
}
sigsetmask(omask);
continue;
}
(void) gettimeofday(&now, (struct timezone *)NULL);
omask = sigblock(sigmask(SIGALRM));
#ifdef doesntwork
/*
printf("s %d, ibits %x index %d, mod %d, sh %x, or %x &ibits %x\n",
s,
ibits.fds_bits[0],
(s)/(sizeof(fd_mask) * 8),
((s) % (sizeof(fd_mask) * 8)),
(1 << ((s) % (sizeof(fd_mask) * 8))),
ibits.fds_bits[(s)/(sizeof(fd_mask) * 8)] & (1 << ((s) % (sizeof(fd_mask) * 8))),
&ibits
);
*/
if (FD_ISSET(s, &ibits))
#else
if (ibits.fds_bits[s/32] & (1 << s))
#endif
process(s);
/* handle ICMP redirects */
sigsetmask(omask);
}
}
timevaladd(t1, t2)
struct timeval *t1, *t2;
{
t1->tv_sec += t2->tv_sec;
if ((t1->tv_usec += t2->tv_usec) > 1000000) {
t1->tv_sec++;
t1->tv_usec -= 1000000;
}
}
timevalsub(t1, t2)
struct timeval *t1, *t2;
{
t1->tv_sec -= t2->tv_sec;
if ((t1->tv_usec -= t2->tv_usec) < 0) {
t1->tv_sec--;
t1->tv_usec += 1000000;
}
}
process(fd)
int fd;
{
struct sockaddr from;
int fromlen, cc;
union {
char buf[MAXPACKETSIZE+1];
struct rip rip;
} inbuf;
for (;;) {
fromlen = sizeof (from);
cc = recvfrom(fd, &inbuf, sizeof (inbuf), 0, &from, &fromlen);
if (cc <= 0) {
if (cc < 0 && errno != EWOULDBLOCK)
perror("recvfrom");
break;
}
if (fromlen != sizeof (struct sockaddr_in))
break;
rip_input(&from, &inbuf.rip, cc);
}
}
getsocket(domain, type, sin)
int domain, type;
struct sockaddr_in *sin;
{
int sock, on = 1;
if ((sock = socket(domain, type, 0)) < 0) {
perror("socket");
syslog(LOG_ERR, "socket: %m");
return (-1);
}
#ifdef SO_BROADCAST
if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) {
syslog(LOG_ERR, "setsockopt SO_BROADCAST: %m");
close(sock);
return (-1);
}
#endif
#ifdef SO_RCVBUF
for (on = bufspace; ; on -= 1024) {
if (setsockopt(sock, SOL_SOCKET, SO_RCVBUF,
&on, sizeof (on)) == 0)
break;
if (on <= 8*1024) {
syslog(LOG_ERR, "setsockopt SO_RCVBUF: %m");
break;
}
}
if (traceactions)
fprintf(ftrace, "recv buf %d\n", on);
#endif
if (bind(sock, (struct sockaddr *)sin, sizeof (*sin)) < 0) {
perror("bind");
syslog(LOG_ERR, "bind: %m");
close(sock);
return (-1);
}
if (fcntl(sock, F_SETFL, O_NONBLOCK) == -1)
syslog(LOG_ERR, "fcntl O_NONBLOCK: %m\n");
return (sock);
}