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- /*
- * 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";
- #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);
- }
-