758 lines
16 KiB
C
758 lines
16 KiB
C
/*
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* The mrouted program is covered by the license in the accompanying file
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* named "LICENSE". Use of the mrouted program represents acceptance of
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* the terms and conditions listed in that file.
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*
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* The mrouted program is COPYRIGHT 1989 by The Board of Trustees of
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* Leland Stanford Junior University.
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*
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*
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* $Id$
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*/
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/*
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* Written by Steve Deering, Stanford University, February 1989.
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*
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* (An earlier version of DVMRP was implemented by David Waitzman of
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* BBN STC by extending Berkeley's routed program. Some of Waitzman's
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* extensions have been incorporated into mrouted, but none of the
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* original routed code has been adopted.)
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*/
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#include "defs.h"
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#ifdef __STDC__
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#include <stdarg.h>
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#else
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#include <varargs.h>
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#endif
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#include <fcntl.h>
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#ifdef SNMP
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#include "snmp.h"
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#endif
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#ifndef lint
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static char rcsid[] =
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"@(#) $Id$";
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#endif
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extern char *configfilename;
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char versionstring[100];
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static char pidfilename[] = _PATH_MROUTED_PID;
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static char dumpfilename[] = _PATH_MROUTED_DUMP;
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static char cachefilename[] = _PATH_MROUTED_CACHE;
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static char genidfilename[] = _PATH_MROUTED_GENID;
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int cache_lifetime = DEFAULT_CACHE_LIFETIME;
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int max_prune_lifetime = DEFAULT_CACHE_LIFETIME * 2;
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int debug = 0;
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u_char pruning = 1; /* Enable pruning by default */
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#ifdef SNMP
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#define NHANDLERS 34
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#else
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#define NHANDLERS 2
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#endif
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static struct ihandler {
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int fd; /* File descriptor */
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ihfunc_t func; /* Function to call with &fd_set */
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} ihandlers[NHANDLERS];
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static int nhandlers = 0;
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/*
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* Forward declarations.
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*/
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static void fasttimer __P((int));
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static void done __P((int));
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static void dump __P((int));
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static void fdump __P((int));
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static void cdump __P((int));
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static void restart __P((int));
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static void timer __P((void));
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static void cleanup __P((void));
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static void resetlogging __P((void *));
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/* To shut up gcc -Wstrict-prototypes */
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int main __P((int argc, char **argv));
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int
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register_input_handler(fd, func)
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int fd;
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ihfunc_t func;
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{
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if (nhandlers >= NHANDLERS)
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return -1;
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ihandlers[nhandlers].fd = fd;
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ihandlers[nhandlers++].func = func;
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return 0;
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}
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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register int recvlen;
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register int omask;
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int dummy;
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FILE *fp;
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struct timeval tv;
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u_int32 prev_genid;
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int vers;
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fd_set rfds, readers;
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int nfds, n, i;
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#ifdef SNMP
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struct timeval timeout, *tvp = &timeout;
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struct timeval sched, *svp = &sched, now, *nvp = &now;
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int index, block;
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#endif
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setlinebuf(stderr);
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if (geteuid() != 0) {
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fprintf(stderr, "mrouted: must be root\n");
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exit(1);
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}
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argv++, argc--;
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while (argc > 0 && *argv[0] == '-') {
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if (strcmp(*argv, "-d") == 0) {
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if (argc > 1 && isdigit(*(argv + 1)[0])) {
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argv++, argc--;
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debug = atoi(*argv);
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} else
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debug = DEFAULT_DEBUG;
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} else if (strcmp(*argv, "-c") == 0) {
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if (argc > 1) {
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argv++, argc--;
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configfilename = *argv;
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} else
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goto usage;
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} else if (strcmp(*argv, "-p") == 0) {
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pruning = 0;
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#ifdef SNMP
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} else if (strcmp(*argv, "-P") == 0) {
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if (argc > 1 && isdigit(*(argv + 1)[0])) {
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argv++, argc--;
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dest_port = atoi(*argv);
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} else
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dest_port = DEFAULT_PORT;
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#endif
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} else
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goto usage;
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argv++, argc--;
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}
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if (argc > 0) {
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usage: fprintf(stderr,
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"usage: mrouted [-p] [-c configfile] [-d [debug_level]]\n");
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exit(1);
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}
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if (debug == 0) {
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/*
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* Detach from the terminal
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*/
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int t;
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if (fork()) exit(0);
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(void)close(0);
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(void)close(1);
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(void)close(2);
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(void)open("/", 0);
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(void)dup2(0, 1);
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(void)dup2(0, 2);
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#ifdef SYSV
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(void)setpgrp();
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#else
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#ifdef TIOCNOTTY
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t = open("/dev/tty", 2);
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if (t >= 0) {
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(void)ioctl(t, TIOCNOTTY, (char *)0);
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(void)close(t);
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}
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#else
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if (setsid() < 0)
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perror("setsid");
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#endif
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#endif
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}
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else
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fprintf(stderr, "debug level %u\n", debug);
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#ifdef LOG_DAEMON
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(void)openlog("mrouted", LOG_PID, LOG_DAEMON);
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(void)setlogmask(LOG_UPTO(LOG_NOTICE));
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#else
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(void)openlog("mrouted", LOG_PID);
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#endif
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sprintf(versionstring, "mrouted version %d.%da",
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PROTOCOL_VERSION, MROUTED_VERSION);
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log(LOG_NOTICE, 0, "%s", versionstring);
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#ifdef SYSV
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srand48(time(NULL));
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#else
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srandom(gethostid());
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#endif
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/*
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* Get generation id
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*/
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gettimeofday(&tv, 0);
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dvmrp_genid = tv.tv_sec;
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fp = fopen(genidfilename, "r");
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if (fp != NULL) {
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fscanf(fp, "%d", &prev_genid);
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if (prev_genid == dvmrp_genid)
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dvmrp_genid++;
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(void) fclose(fp);
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}
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fp = fopen(genidfilename, "w");
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if (fp != NULL) {
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fprintf(fp, "%d", dvmrp_genid);
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(void) fclose(fp);
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}
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callout_init();
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init_igmp();
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init_routes();
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init_ktable();
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k_init_dvmrp(); /* enable DVMRP routing in kernel */
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#ifndef OLD_KERNEL
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vers = k_get_version();
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/*XXX
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* This function must change whenever the kernel version changes
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*/
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if ((((vers >> 8) & 0xff) != 3) ||
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((vers & 0xff) != 5))
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log(LOG_ERR, 0, "kernel (v%d.%d)/mrouted (v%d.%d) version mismatch",
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(vers >> 8) & 0xff, vers & 0xff,
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PROTOCOL_VERSION, MROUTED_VERSION);
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#endif
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#ifdef SNMP
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if (i = snmp_init())
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return i;
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gettimeofday(nvp, 0);
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if (nvp->tv_usec < 500000L){
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svp->tv_usec = nvp->tv_usec + 500000L;
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svp->tv_sec = nvp->tv_sec;
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} else {
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svp->tv_usec = nvp->tv_usec - 500000L;
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svp->tv_sec = nvp->tv_sec + 1;
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}
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#endif /* SNMP */
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init_vifs();
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#ifdef RSRR
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rsrr_init();
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#endif /* RSRR */
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#if defined(__STDC__) || defined(__GNUC__)
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/*
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* Allow cleanup if unexpected exit. Apparently some architectures
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* have a kernel bug where closing the socket doesn't do an
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* ip_mrouter_done(), so we attempt to do it on exit.
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*/
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atexit(cleanup);
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#endif
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if (debug)
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fprintf(stderr, "pruning %s\n", pruning ? "on" : "off");
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fp = fopen(pidfilename, "w");
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if (fp != NULL) {
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fprintf(fp, "%d\n", (int)getpid());
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(void) fclose(fp);
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}
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(void)signal(SIGALRM, fasttimer);
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(void)signal(SIGHUP, restart);
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(void)signal(SIGTERM, done);
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(void)signal(SIGINT, done);
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(void)signal(SIGUSR1, fdump);
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(void)signal(SIGUSR2, cdump);
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if (debug != 0)
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(void)signal(SIGQUIT, dump);
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FD_ZERO(&readers);
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FD_SET(igmp_socket, &readers);
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nfds = igmp_socket + 1;
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for (i = 0; i < nhandlers; i++) {
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FD_SET(ihandlers[i].fd, &readers);
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if (ihandlers[i].fd >= nfds)
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nfds = ihandlers[i].fd + 1;
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}
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/*
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* Install the vifs in the kernel as late as possible in the
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* initialization sequence.
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*/
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init_installvifs();
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if (debug >= 2) dump(0);
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/* Start up the log rate-limiter */
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resetlogging(NULL);
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(void)alarm(1); /* schedule first timer interrupt */
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/*
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* Main receive loop.
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*/
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dummy = 0;
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for(;;) {
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#ifdef SYSV
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sigset_t block, oblock;
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#endif
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bcopy((char *)&readers, (char *)&rfds, sizeof(rfds));
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#ifdef SNMP
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gettimeofday(nvp, 0);
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if (nvp->tv_sec > svp->tv_sec
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|| (nvp->tv_sec == svp->tv_sec && nvp->tv_usec > svp->tv_usec)){
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alarmTimer(nvp);
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eventTimer(nvp);
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if (nvp->tv_usec < 500000L){
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svp->tv_usec = nvp->tv_usec + 500000L;
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svp->tv_sec = nvp->tv_sec;
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} else {
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svp->tv_usec = nvp->tv_usec - 500000L;
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svp->tv_sec = nvp->tv_sec + 1;
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}
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}
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tvp = &timeout;
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tvp->tv_sec = 0;
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tvp->tv_usec = 500000L;
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block = 0;
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snmp_select_info(&nfds, &rfds, tvp, &block);
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if (block == 1)
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tvp = NULL; /* block without timeout */
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if ((n = select(nfds, &rfds, NULL, NULL, tvp)) < 0)
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#else
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if ((n = select(nfds, &rfds, NULL, NULL, NULL)) < 0)
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#endif
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{
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if (errno != EINTR) /* SIGALRM is expected */
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log(LOG_WARNING, errno, "select failed");
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continue;
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}
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if (FD_ISSET(igmp_socket, &rfds)) {
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recvlen = recvfrom(igmp_socket, recv_buf, RECV_BUF_SIZE,
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0, NULL, &dummy);
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if (recvlen < 0) {
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if (errno != EINTR) log(LOG_ERR, errno, "recvfrom");
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continue;
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}
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#ifdef SYSV
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(void)sigemptyset(&block);
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(void)sigaddset(&block, SIGALRM);
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if (sigprocmask(SIG_BLOCK, &block, &oblock) < 0)
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log(LOG_ERR, errno, "sigprocmask");
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#else
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omask = sigblock(sigmask(SIGALRM));
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#endif
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accept_igmp(recvlen);
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#ifdef SYSV
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(void)sigprocmask(SIG_SETMASK, &oblock, (sigset_t *)NULL);
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#else
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(void)sigsetmask(omask);
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#endif
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}
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for (i = 0; i < nhandlers; i++) {
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if (FD_ISSET(ihandlers[i].fd, &rfds)) {
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(*ihandlers[i].func)(ihandlers[i].fd, &rfds);
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}
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}
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#ifdef SNMP
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snmp_read(&rfds);
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snmp_timeout(); /* poll */
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#endif
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}
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}
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/*
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* routine invoked every second. Its main goal is to cycle through
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* the routing table and send partial updates to all neighbors at a
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* rate that will cause the entire table to be sent in ROUTE_REPORT_INTERVAL
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* seconds. Also, every TIMER_INTERVAL seconds it calls timer() to
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* do all the other time-based processing.
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*/
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static void
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fasttimer(i)
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int i;
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{
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static unsigned int tlast;
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static unsigned int nsent;
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register unsigned int t = tlast + 1;
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register int n;
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/*
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* if we're in the last second, send everything that's left.
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* otherwise send at least the fraction we should have sent by now.
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*/
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if (t >= ROUTE_REPORT_INTERVAL) {
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register int nleft = nroutes - nsent;
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while (nleft > 0) {
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if ((n = report_next_chunk()) <= 0)
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break;
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nleft -= n;
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}
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tlast = 0;
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nsent = 0;
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} else {
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register unsigned int ncum = nroutes * t / ROUTE_REPORT_INTERVAL;
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while (nsent < ncum) {
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if ((n = report_next_chunk()) <= 0)
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break;
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nsent += n;
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}
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tlast = t;
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}
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if ((t % TIMER_INTERVAL) == 0)
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timer();
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age_callout_queue();/* Advance the timer for the callout queue
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for groups */
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alarm(1);
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}
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/*
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* The 'virtual_time' variable is initialized to a value that will cause the
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* first invocation of timer() to send a probe or route report to all vifs
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* and send group membership queries to all subnets for which this router is
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* querier. This first invocation occurs approximately TIMER_INTERVAL seconds
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* after the router starts up. Note that probes for neighbors and queries
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* for group memberships are also sent at start-up time, as part of initial-
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* ization. This repetition after a short interval is desirable for quickly
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* building up topology and membership information in the presence of possible
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* packet loss.
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*
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* 'virtual_time' advances at a rate that is only a crude approximation of
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* real time, because it does not take into account any time spent processing,
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* and because the timer intervals are sometimes shrunk by a random amount to
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* avoid unwanted synchronization with other routers.
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*/
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static u_long virtual_time = 0;
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/*
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* Timer routine. Performs periodic neighbor probing, route reporting, and
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* group querying duties, and drives various timers in routing entries and
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* virtual interface data structures.
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*/
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static void
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timer()
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{
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age_routes(); /* Advance the timers in the route entries */
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age_vifs(); /* Advance the timers for neighbors */
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age_table_entry(); /* Advance the timers for the cache entries */
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if (virtual_time % GROUP_QUERY_INTERVAL == 0) {
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/*
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* Time to query the local group memberships on all subnets
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* for which this router is the elected querier.
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*/
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query_groups();
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}
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if (virtual_time % NEIGHBOR_PROBE_INTERVAL == 0) {
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/*
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* Time to send a probe on all vifs from which no neighbors have
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* been heard. Also, check if any inoperative interfaces have now
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* come up. (If they have, they will also be probed as part of
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* their initialization.)
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*/
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probe_for_neighbors();
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if (vifs_down)
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check_vif_state();
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}
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delay_change_reports = FALSE;
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if (routes_changed) {
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/*
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* Some routes have changed since the last timer interrupt, but
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* have not been reported yet. Report the changed routes to all
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* neighbors.
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*/
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report_to_all_neighbors(CHANGED_ROUTES);
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}
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#ifdef SNMP
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sync_timer();
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#endif
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/*
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* Advance virtual time
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*/
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virtual_time += TIMER_INTERVAL;
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}
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/*
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* On termination, let everyone know we're going away.
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*/
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static void
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done(i)
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int i;
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{
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log(LOG_NOTICE, 0, "%s exiting", versionstring);
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cleanup();
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_exit(1);
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}
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static void
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cleanup()
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{
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static in_cleanup = 0;
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if (!in_cleanup) {
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in_cleanup++;
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#ifdef RSRR
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rsrr_clean();
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#endif /* RSRR */
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expire_all_routes();
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report_to_all_neighbors(ALL_ROUTES);
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k_stop_dvmrp();
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}
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}
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/*
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* Dump internal data structures to stderr.
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*/
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static void
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dump(i)
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int i;
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{
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dump_vifs(stderr);
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dump_routes(stderr);
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}
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/*
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* Dump internal data structures to a file.
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*/
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static void
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fdump(i)
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int i;
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{
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FILE *fp;
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fp = fopen(dumpfilename, "w");
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if (fp != NULL) {
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dump_vifs(fp);
|
|
dump_routes(fp);
|
|
(void) fclose(fp);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Dump local cache contents to a file.
|
|
*/
|
|
static void
|
|
cdump(i)
|
|
int i;
|
|
{
|
|
FILE *fp;
|
|
|
|
fp = fopen(cachefilename, "w");
|
|
if (fp != NULL) {
|
|
dump_cache(fp);
|
|
(void) fclose(fp);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Restart mrouted
|
|
*/
|
|
static void
|
|
restart(i)
|
|
int i;
|
|
{
|
|
register int omask;
|
|
#ifdef SYSV
|
|
sigset_t block, oblock;
|
|
#endif
|
|
|
|
log(LOG_NOTICE, 0, "%s restart", versionstring);
|
|
|
|
/*
|
|
* reset all the entries
|
|
*/
|
|
#ifdef SYSV
|
|
(void)sigemptyset(&block);
|
|
(void)sigaddset(&block, SIGALRM);
|
|
if (sigprocmask(SIG_BLOCK, &block, &oblock) < 0)
|
|
log(LOG_ERR, errno, "sigprocmask");
|
|
#else
|
|
omask = sigblock(sigmask(SIGALRM));
|
|
#endif
|
|
free_all_prunes();
|
|
free_all_routes();
|
|
stop_all_vifs();
|
|
k_stop_dvmrp();
|
|
close(igmp_socket);
|
|
close(udp_socket);
|
|
|
|
/*
|
|
* start processing again
|
|
*/
|
|
dvmrp_genid++;
|
|
pruning = 1;
|
|
|
|
init_igmp();
|
|
init_routes();
|
|
init_ktable();
|
|
init_vifs();
|
|
k_init_dvmrp(); /* enable DVMRP routing in kernel */
|
|
init_installvifs();
|
|
|
|
#ifdef SYSV
|
|
(void)sigprocmask(SIG_SETMASK, &oblock, (sigset_t *)NULL);
|
|
#else
|
|
(void)sigsetmask(omask);
|
|
#endif
|
|
}
|
|
|
|
#define LOG_MAX_MSGS 20 /* if > 20/minute then shut up for a while */
|
|
#define LOG_SHUT_UP 600 /* shut up for 10 minutes */
|
|
static int log_nmsgs = 0;
|
|
|
|
static void
|
|
resetlogging(arg)
|
|
void *arg;
|
|
{
|
|
int nxttime = 60;
|
|
void *narg = NULL;
|
|
|
|
if (arg == NULL && log_nmsgs > LOG_MAX_MSGS) {
|
|
nxttime = LOG_SHUT_UP;
|
|
narg = (void *)&log_nmsgs; /* just need some valid void * */
|
|
syslog(LOG_WARNING, "logging too fast, shutting up for %d minutes",
|
|
LOG_SHUT_UP / 60);
|
|
} else {
|
|
log_nmsgs = 0;
|
|
}
|
|
|
|
timer_setTimer(nxttime, resetlogging, narg);
|
|
}
|
|
|
|
/*
|
|
* Log errors and other messages to the system log daemon and to stderr,
|
|
* according to the severity of the message and the current debug level.
|
|
* For errors of severity LOG_ERR or worse, terminate the program.
|
|
*/
|
|
#ifdef __STDC__
|
|
void
|
|
log(int severity, int syserr, char *format, ...)
|
|
{
|
|
va_list ap;
|
|
static char fmt[211] = "warning - ";
|
|
char *msg;
|
|
char tbuf[20];
|
|
struct timeval now;
|
|
struct tm *thyme;
|
|
|
|
va_start(ap, format);
|
|
#else
|
|
/*VARARGS3*/
|
|
void
|
|
log(severity, syserr, format, va_alist)
|
|
int severity, syserr;
|
|
char *format;
|
|
va_dcl
|
|
{
|
|
va_list ap;
|
|
static char fmt[211] = "warning - ";
|
|
char *msg;
|
|
char tbuf[20];
|
|
struct timeval now;
|
|
struct tm *thyme;
|
|
|
|
va_start(ap);
|
|
#endif
|
|
vsprintf(&fmt[10], format, ap);
|
|
va_end(ap);
|
|
msg = (severity == LOG_WARNING) ? fmt : &fmt[10];
|
|
|
|
switch (debug) {
|
|
case 0: break;
|
|
case 1: if (severity > LOG_NOTICE) break;
|
|
case 2: if (severity > LOG_INFO ) break;
|
|
default:
|
|
gettimeofday(&now,NULL);
|
|
thyme = localtime(&now.tv_sec);
|
|
strftime(tbuf, sizeof(tbuf), "%X.%%03d ", thyme);
|
|
fprintf(stderr, tbuf, now.tv_usec / 1000);
|
|
fprintf(stderr, "%s", msg);
|
|
if (syserr == 0)
|
|
fprintf(stderr, "\n");
|
|
else if (syserr < sys_nerr)
|
|
fprintf(stderr, ": %s\n", sys_errlist[syserr]);
|
|
else
|
|
fprintf(stderr, ": errno %d\n", syserr);
|
|
}
|
|
|
|
if (severity <= LOG_NOTICE) {
|
|
if (log_nmsgs++ < LOG_MAX_MSGS) {
|
|
if (syserr != 0) {
|
|
errno = syserr;
|
|
syslog(severity, "%s: %m", msg);
|
|
} else
|
|
syslog(severity, "%s", msg);
|
|
}
|
|
|
|
if (severity <= LOG_ERR) exit(-1);
|
|
}
|
|
}
|
|
|
|
#ifdef DEBUG_MFC
|
|
void
|
|
md_log(what, origin, mcastgrp)
|
|
int what;
|
|
u_int32 origin, mcastgrp;
|
|
{
|
|
static FILE *f = NULL;
|
|
struct timeval tv;
|
|
u_int32 buf[4];
|
|
|
|
if (!f) {
|
|
if ((f = fopen("/tmp/mrouted.clog", "w")) == NULL) {
|
|
log(LOG_ERR, errno, "open /tmp/mrouted.clog");
|
|
}
|
|
}
|
|
|
|
gettimeofday(&tv, NULL);
|
|
buf[0] = tv.tv_sec;
|
|
buf[1] = what;
|
|
buf[2] = origin;
|
|
buf[3] = mcastgrp;
|
|
|
|
fwrite(buf, sizeof(u_int32), 4, f);
|
|
}
|
|
#endif
|