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HardenedBSD/usr.sbin/pim6dd/main.c
David E. O'Brien 1a37aa566b Add `_PATH_DEVZERO'. 
Use _PATH_* where where possible.
2000-12-09 09:35:55 +00:00

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/*
* Copyright (c) 1998 by the University of Oregon.
* All rights reserved.
*
* Permission to use, copy, modify, and distribute this software and
* its documentation in source and binary forms for lawful
* purposes and without fee is hereby granted, provided
* that the above copyright notice appear in all copies and that both
* the copyright notice and this permission notice appear in supporting
* documentation, and that any documentation, advertising materials,
* and other materials related to such distribution and use acknowledge
* that the software was developed by the University of Oregon.
* The name of the University of Oregon may not be used to endorse or
* promote products derived from this software without specific prior
* written permission.
*
* THE UNIVERSITY OF OREGON DOES NOT MAKE ANY REPRESENTATIONS
* ABOUT THE SUITABILITY OF THIS SOFTWARE FOR ANY PURPOSE. THIS SOFTWARE IS
* PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND
* NON-INFRINGEMENT.
*
* IN NO EVENT SHALL UO, OR ANY OTHER CONTRIBUTOR BE LIABLE FOR ANY
* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES, WHETHER IN CONTRACT,
* TORT, OR OTHER FORM OF ACTION, ARISING OUT OF OR IN CONNECTION WITH,
* THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Other copyrights might apply to parts of this software and are so
* noted when applicable.
*/
/*
* Questions concerning this software should be directed to
* Kurt Windisch (kurtw@antc.uoregon.edu)
*
* $Id: main.c,v 1.4 2000/10/05 22:20:38 itojun Exp $
*/
/*
* Part of this program has been derived from PIM sparse-mode pimd.
* The pimd program is covered by the license in the accompanying file
* named "LICENSE.pimd".
*
* The pimd program is COPYRIGHT 1998 by University of Southern California.
*
* Part of this program has been derived from mrouted.
* The mrouted program is covered by the license in the accompanying file
* named "LICENSE.mrouted".
*
* The mrouted program is COPYRIGHT 1989 by The Board of Trustees of
* Leland Stanford Junior University.
*
* $FreeBSD$
*/
#include <paths.h>
#include "defs.h"
#ifdef SNMP
#include "snmp.h"
#endif
char configfilename[256] = _PATH_PIM6D_CONF;
char versionstring[100];
static char pidfilename[] = _PATH_PIM6D_PID;
/* TODO: not used
static char genidfilename[] = _PATH_PIM6D_GENID;
*/
int haveterminal = 1;
char *progname;
static int sighandled = 0;
#define GOT_SIGINT 0x01
#define GOT_SIGHUP 0x02
#define GOT_SIGUSR1 0x04
#define GOT_SIGUSR2 0x08
#define GOT_SIGALRM 0x10
#ifdef SNMP
#define NHANDLERS 34
#else
#define NHANDLERS 3
#endif
static struct ihandler {
int fd; /* File descriptor */
ihfunc_t func; /* Function to call with &fd_set */
} ihandlers[NHANDLERS];
static int nhandlers = 0;
static struct debugname {
char *name;
int level;
int nchars;
} debugnames[] = {
#if 0
{ "dvmrp_detail", DEBUG_DVMRP_DETAIL, 5 },
{ "dvmrp_prunes", DEBUG_DVMRP_PRUNE, 8 },
{ "dvmrp_pruning", DEBUG_DVMRP_PRUNE, 8 },
{ "dvmrp_mrt", DEBUG_DVMRP_ROUTE, 7 },
{ "dvmrp_routes", DEBUG_DVMRP_ROUTE, 7 },
{ "dvmrp_routing", DEBUG_DVMRP_ROUTE, 7 },
{ "dvmrp_neighbors", DEBUG_DVMRP_PEER, 7 },
{ "dvmrp_peers", DEBUG_DVMRP_PEER, 8 },
{ "dvmrp_hello", DEBUG_DVMRP_PEER, 7 },
{ "dvmrp_timers", DEBUG_DVMRP_TIMER, 7 },
{ "dvmrp", DEBUG_DVMRP, 1 },
{ "igmp_proto", DEBUG_IGMP_PROTO, 6 },
{ "igmp_timers", DEBUG_IGMP_TIMER, 6 },
{ "igmp_members", DEBUG_IGMP_MEMBER, 6 },
{ "groups", DEBUG_MEMBER, 1 },
{ "membership", DEBUG_MEMBER, 2 },
{ "igmp", DEBUG_IGMP, 1 },
#endif
{ "trace", DEBUG_TRACE, 2 },
{ "mtrace", DEBUG_TRACE, 2 },
{ "traceroute", DEBUG_TRACE, 2 },
{ "timeout", DEBUG_TIMEOUT, 2 },
{ "callout", DEBUG_TIMEOUT, 3 },
{ "pkt", DEBUG_PKT, 2 },
{ "packets", DEBUG_PKT, 2 },
{ "interfaces", DEBUG_IF, 2 },
{ "vif", DEBUG_IF, 1 },
{ "kernel", DEBUG_KERN, 2 },
{ "cache", DEBUG_MFC, 1 },
{ "mfc", DEBUG_MFC, 2 },
{ "k_cache", DEBUG_MFC, 2 },
{ "k_mfc", DEBUG_MFC, 2 },
{ "rsrr", DEBUG_RSRR, 2 },
{ "pim_detail", DEBUG_PIM_DETAIL, 5 },
{ "pim_hello", DEBUG_PIM_HELLO, 5 },
{ "pim_neighbors", DEBUG_PIM_HELLO, 5 },
{ "pim_register", DEBUG_PIM_REGISTER, 5 },
{ "registers", DEBUG_PIM_REGISTER, 2 },
{ "pim_join_prune", DEBUG_PIM_JOIN_PRUNE, 5 },
{ "pim_j_p", DEBUG_PIM_JOIN_PRUNE, 5 },
{ "pim_jp", DEBUG_PIM_JOIN_PRUNE, 5 },
{ "pim_graft", DEBUG_PIM_GRAFT, 5 },
{ "pim_bootstrap", DEBUG_PIM_BOOTSTRAP, 5 },
{ "pim_bsr", DEBUG_PIM_BOOTSTRAP, 5 },
{ "bsr", DEBUG_PIM_BOOTSTRAP, 1 },
{ "bootstrap", DEBUG_PIM_BOOTSTRAP, 1 },
{ "pim_asserts", DEBUG_PIM_ASSERT, 5 },
{ "pim_cand_rp", DEBUG_PIM_CAND_RP, 5 },
{ "pim_c_rp", DEBUG_PIM_CAND_RP, 5 },
{ "pim_rp", DEBUG_PIM_CAND_RP, 6 },
{ "rp", DEBUG_PIM_CAND_RP, 2 },
{ "pim_routes", DEBUG_PIM_MRT, 6 },
{ "pim_routing", DEBUG_PIM_MRT, 6 },
{ "pim_mrt", DEBUG_PIM_MRT, 5 },
{ "pim_timers", DEBUG_PIM_TIMER, 5 },
{ "pim_rpf", DEBUG_PIM_RPF, 6 },
{ "rpf", DEBUG_RPF, 3 },
{ "pim", DEBUG_PIM, 1 },
{ "routes", DEBUG_MRT, 1 },
{ "routing", DEBUG_MRT, 1 },
{ "mrt", DEBUG_MRT, 1 },
{ "routers", DEBUG_NEIGHBORS, 6 },
{ "mrouters", DEBUG_NEIGHBORS, 7 },
{ "neighbors", DEBUG_NEIGHBORS, 1 },
{ "timers", DEBUG_TIMER, 1 },
{ "asserts", DEBUG_ASSERT, 1 },
{ "all", DEBUG_ALL, 2 },
{ "3", 0xffffffff, 1 } /* compat. */
};
/*
* Forward declarations.
*/
static void handler __P((int));
static void timer __P((void *));
static void cleanup __P((void));
static void restart __P((int));
static void cleanup __P((void));
static void resetlogging __P((void *));
/* To shut up gcc -Wstrict-prototypes */
int main __P((int argc, char **argv));
int
register_input_handler(fd, func)
int fd;
ihfunc_t func;
{
if (nhandlers >= NHANDLERS)
return -1;
ihandlers[nhandlers].fd = fd;
ihandlers[nhandlers++].func = func;
return 0;
}
int
main(argc, argv)
int argc;
char *argv[];
{
int dummy, dummysigalrm;
FILE *fp;
struct timeval tv, difftime, curtime, lasttime, *timeout;
fd_set rfds, readers;
int nfds, n, i, secs;
extern char todaysversion[];
struct sigaction sa;
struct debugname *d;
char c;
int tmpd;
setlinebuf(stderr);
if (geteuid() != 0) {
fprintf(stderr, "pim6dd: must be root\n");
exit(1);
}
progname = strrchr(argv[0], '/');
if (progname)
progname++;
else
progname = argv[0];
argv++;
argc--;
while (argc > 0 && *argv[0] == '-') {
if (strcmp(*argv, "-d") == 0) {
if (argc > 1 && *(argv + 1)[0] != '-') {
char *p,*q;
int i, len;
struct debugname *d;
argv++;
argc--;
debug = 0;
p = *argv; q = NULL;
while (p) {
q = strchr(p, ',');
if (q)
*q++ = '\0';
len = strlen(p);
for (i = 0, d = debugnames;
i < sizeof(debugnames) / sizeof(debugnames[0]);
i++, d++)
if (len >= d->nchars && strncmp(d->name, p, len) == 0)
break;
if (i == sizeof(debugnames) / sizeof(debugnames[0])) {
int j = 0xffffffff;
int k = 0;
fprintf(stderr, "Valid debug levels: ");
for (i = 0, d = debugnames;
i < sizeof(debugnames) / sizeof(debugnames[0]);
i++, d++) {
if ((j & d->level) == d->level) {
if (k++)
putc(',', stderr);
fputs(d->name, stderr);
j &= ~d->level;
}
}
putc('\n', stderr);
goto usage;
}
debug |= d->level;
p = q;
}
}
else
debug = DEBUG_DEFAULT;
}
else if (strcmp(*argv, "-c") == 0) {
if (argc > 1) {
argv++; argc--;
strcpy(configfilename, *argv);
}
else
goto usage;
/* TODO: not implemented */
#ifdef SNMP
}
else if (strcmp(*argv, "-P") == 0) {
if (argc > 1 && isdigit(*(argv + 1)[0])) {
argv++, argc--;
dest_port = atoi(*argv);
}
else
dest_port = DEFAULT_PORT;
#endif
}
else
goto usage;
argv++; argc--;
}
if (argc > 0) {
usage:
tmpd = 0xffffffff;
fprintf(stderr, "usage: pim6dd [-c configfile] [-d [debug_level][,debug_level]]\n");
fprintf(stderr, "debug levels: ");
c = '(';
for (d = debugnames; d < debugnames +
sizeof(debugnames) / sizeof(debugnames[0]); d++) {
if ((tmpd & d->level) == d->level) {
tmpd &= ~d->level;
fprintf(stderr, "%c%s", c, d->name);
c = ',';
}
}
fprintf(stderr, ")\n");
exit(1);
}
if (debug != 0) {
tmpd = debug;
fprintf(stderr, "debug level 0x%lx ", debug);
c = '(';
for (d = debugnames; d < debugnames +
sizeof(debugnames) / sizeof(debugnames[0]); d++) {
if ((tmpd & d->level) == d->level) {
tmpd &= ~d->level;
fprintf(stderr, "%c%s", c, d->name);
c = ',';
}
}
fprintf(stderr, ")\n");
}
#ifdef LOG_DAEMON
(void)openlog("pim6dd", LOG_PID, LOG_DAEMON);
(void)setlogmask(LOG_UPTO(LOG_NOTICE));
#else
(void)openlog("pim6dd", LOG_PID);
#endif /* LOG_DAEMON */
sprintf(versionstring, "pim6dd version %s", todaysversion);
log(LOG_DEBUG, 0, "%s starting", versionstring);
/* TODO: XXX: use a combination of time and hostid to initialize the random
* generator.
*/
#ifdef SYSV
srand48(time(NULL));
#else
{
struct timeval tm;
gettimeofday(&tm, NULL);
srandom(tm.tv_usec + gethostid());
}
#endif
callout_init();
/* Start up the log rate-limiter */
resetlogging(NULL);
init_mld6();
#if 0
k_stop_pim(mld6_socket);
exit(0); /* XXX */
#endif
init_pim6();
init_pim6_mrt();
init_timers();
/* TODO: check the kernel DVMRP/MROUTED/PIM support version */
#ifdef SNMP
if (i = snmp_init())
return i;
#endif /* SNMP */
init_vifs();
#ifdef RSRR
rsrr_init();
#endif /* RSRR */
sa.sa_handler = handler;
sa.sa_flags = 0; /* Interrupt system calls */
sigemptyset(&sa.sa_mask);
sigaction(SIGALRM, &sa, NULL);
sigaction(SIGHUP, &sa, NULL);
sigaction(SIGTERM, &sa, NULL);
sigaction(SIGINT, &sa, NULL);
sigaction(SIGUSR1, &sa, NULL);
sigaction(SIGUSR2, &sa, NULL);
FD_ZERO(&readers);
FD_SET(mld6_socket, &readers);
nfds = mld6_socket + 1;
for (i = 0; i < nhandlers; i++) {
FD_SET(ihandlers[i].fd, &readers);
if (ihandlers[i].fd >= nfds)
nfds = ihandlers[i].fd + 1;
}
IF_DEBUG(DEBUG_IF)
dump_vifs(stderr);
IF_DEBUG(DEBUG_PIM_MRT)
dump_pim_mrt(stderr);
/* schedule first timer interrupt */
timer_setTimer(TIMER_INTERVAL, timer, NULL);
if (debug == 0) {
/* Detach from the terminal */
#ifdef TIOCNOTTY
int t;
#endif /* TIOCNOTTY */
haveterminal = 0;
if (fork())
exit(0);
(void)close(0);
(void)close(1);
(void)close(2);
(void)open("/", 0);
(void)dup2(0, 1);
(void)dup2(0, 2);
#if defined(SYSV) || defined(linux)
(void)setpgrp();
#else
#ifdef TIOCNOTTY
t = open(_PATH_TTY, 2);
if (t >= 0) {
(void)ioctl(t, TIOCNOTTY, (char *)0);
(void)close(t);
}
#else
if (setsid() < 0)
perror("setsid");
#endif /* TIOCNOTTY */
#endif /* SYSV */
} /* End of child process code */
#ifdef HAVE_ROUTING_SOCKETS
init_routesock();
#endif /* HAVE_ROUTING_SOCKETS */
fp = fopen(pidfilename, "w");
if (fp != NULL) {
fprintf(fp, "%d\n", (int)getpid());
(void) fclose(fp);
}
/*
* Main receive loop.
*/
dummy = 0;
dummysigalrm = SIGALRM;
difftime.tv_usec = 0;
gettimeofday(&curtime, NULL);
lasttime = curtime;
for(;;) {
bcopy((char *)&readers, (char *)&rfds, sizeof(rfds));
secs = timer_nextTimer();
if (secs == -1)
timeout = NULL;
else {
timeout = &tv;
timeout->tv_sec = secs;
timeout->tv_usec = 0;
}
if (sighandled) {
if (sighandled & GOT_SIGINT) {
sighandled &= ~GOT_SIGINT;
break;
}
if (sighandled & GOT_SIGHUP) {
sighandled &= ~GOT_SIGHUP;
restart(SIGHUP);
}
if (sighandled & GOT_SIGUSR1) {
sighandled &= ~GOT_SIGUSR1;
fdump(SIGUSR1);
}
if (sighandled & GOT_SIGUSR2) {
sighandled &= ~GOT_SIGUSR2;
cdump(SIGUSR2);
}
if (sighandled & GOT_SIGALRM) {
sighandled &= ~GOT_SIGALRM;
timer(&dummysigalrm);
}
}
if ((n = select(nfds, &rfds, NULL, NULL, timeout)) < 0) {
if (errno != EINTR) /* SIGALRM is expected */
log(LOG_WARNING, errno, "select failed");
continue;
}
/*
* Handle timeout queue.
*
* If select + packet processing took more than 1 second,
* or if there is a timeout pending, age the timeout queue.
*
* If not, collect usec in difftime to make sure that the
* time doesn't drift too badly.
*
* If the timeout handlers took more than 1 second,
* age the timeout queue again. XXX This introduces the
* potential for infinite loops!
*/
do {
/*
* If the select timed out, then there's no other
* activity to account for and we don't need to
* call gettimeofday.
*/
if (n == 0) {
curtime.tv_sec = lasttime.tv_sec + secs;
curtime.tv_usec = lasttime.tv_usec;
n = -1; /* don't do this next time through the loop */
} else
gettimeofday(&curtime, NULL);
difftime.tv_sec = curtime.tv_sec - lasttime.tv_sec;
difftime.tv_usec += curtime.tv_usec - lasttime.tv_usec;
#ifdef TIMERDEBUG
IF_DEBUG(DEBUG_TIMEOUT)
log(LOG_DEBUG, 0, "TIMEOUT: secs %d, diff secs %d, diff usecs %d", secs, difftime.tv_sec, difftime.tv_usec );
#endif
while (difftime.tv_usec >= 1000000) {
difftime.tv_sec++;
difftime.tv_usec -= 1000000;
}
if (difftime.tv_usec < 0) {
difftime.tv_sec--;
difftime.tv_usec += 1000000;
}
lasttime = curtime;
if (secs == 0 || difftime.tv_sec > 0) {
#ifdef TIMERDEBUG
IF_DEBUG(DEBUG_TIMEOUT)
log(LOG_DEBUG, 0, "\taging callouts: secs %d, diff secs %d, diff usecs %d", secs, difftime.tv_sec, difftime.tv_usec );
#endif
age_callout_queue(difftime.tv_sec);
}
secs = -1;
} while (difftime.tv_sec > 0);
/* Handle sockets */
if (n > 0) {
/* TODO: shall check first mld6_socket for better performance? */
for (i = 0; i < nhandlers; i++) {
if (FD_ISSET(ihandlers[i].fd, &rfds)) {
(*ihandlers[i].func)(ihandlers[i].fd, &rfds);
}
}
}
} /* Main loop */
log(LOG_NOTICE, 0, "%s exiting", versionstring);
cleanup();
exit(0);
}
/*
* The 'virtual_time' variable is initialized to a value that will cause the
* first invocation of timer() to send a probe or route report to all vifs
* and send group membership queries to all subnets for which this router is
* querier. This first invocation occurs approximately TIMER_INTERVAL seconds
* after the router starts up. Note that probes for neighbors and queries
* for group memberships are also sent at start-up time, as part of initial-
* ization. This repetition after a short interval is desirable for quickly
* building up topology and membership information in the presence of possible
* packet loss.
*
* 'virtual_time' advances at a rate that is only a crude approximation of
* real time, because it does not take into account any time spent processing,
* and because the timer intervals are sometimes shrunk by a random amount to
* avoid unwanted synchronization with other routers.
*/
u_long virtual_time = 0;
/*
* Timer routine. Performs all perodic functions:
* aging interfaces, quering neighbors and members, etc... The granularity
* is equal to TIMER_INTERVAL.
*/
static void
timer(i)
void *i;
{
age_vifs(); /* Timeout neighbors and groups */
age_routes(); /* Timeout routing entries */
virtual_time += TIMER_INTERVAL;
timer_setTimer(TIMER_INTERVAL, timer, NULL);
}
/*
* Performs all necessary functions to quit gracefully
*/
/* TODO: implement all necessary stuff */
static void
cleanup()
{
#ifdef RSRR
rsrr_clean();
#endif /* RSRR */
k_stop_pim(mld6_socket);
/* TODO: XXX (not in the spec)
*/
}
/*
* Signal handler. Take note of the fact that the signal arrived
* so that the main loop can take care of it.
*/
static void
handler(sig)
int sig;
{
switch (sig) {
case SIGALRM:
sighandled |= GOT_SIGALRM;
case SIGINT:
case SIGTERM:
sighandled |= GOT_SIGINT;
break;
case SIGHUP:
sighandled |= GOT_SIGHUP;
break;
case SIGUSR1:
sighandled |= GOT_SIGUSR1;
break;
case SIGUSR2:
sighandled |= GOT_SIGUSR2;
break;
}
}
/* TODO: not verified */
/* PIMDM TODO */
/*
* Restart the daemon
*/
static void
restart(i)
int i;
{
#ifdef SNMP
int s;
#endif /* SNMP */
log(LOG_NOTICE, 0, "%s restart", versionstring);
/*
* reset all the entries
*/
/*
* TODO: delete?
* free_all_routes();
*/
free_all_callouts();
stop_all_vifs();
nhandlers=0;
k_stop_pim(mld6_socket);
close(mld6_socket);
close(pim6_socket);
close(udp_socket);
/*
* start processing again
*/
init_mld6();
init_pim6();
#ifdef HAVE_ROUTING_SOCKETS
init_routesock();
#endif /* HAVE_ROUTING_SOCKETS */
init_pim6_mrt();
#ifdef SNMP
if ( s = snmp_init())
exit(s);
#endif /* SNMP */
init_vifs();
#ifdef RSRR
rsrr_init();
#endif /* RSRR */
/* schedule timer interrupts */
timer_setTimer(TIMER_INTERVAL, timer, NULL);
}
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);
}
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