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freebsd-src/usr.sbin/pim6sd/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 Southern California.
* 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 Southern
* California and/or Information Sciences Institute.
* The name of the University of Southern California may not
* be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THE UNIVERSITY OF SOUTHERN CALIFORNIA 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 USC, 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
* Mickael Hoerdt (hoerdt@clarinet.u-strasbg.fr) LSIIT Strasbourg.
*
*/
/*
* This program has been derived from pim6dd.
* The pim6dd program is covered by the license in the accompanying file
* named "LICENSE.pim6dd".
*/
/*
* This program has been derived from pimd.
* The pimd program is covered by the license in the accompanying file
* named "LICENSE.pimd".
*
*/
/*
* 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 <sys/param.h>
#include <sys/time.h>
#include <errno.h>
#include <paths.h>
#include <stdlib.h>
#include <stdio.h>
#include <signal.h>
#include <string.h>
#include <syslog.h>
#include <fcntl.h>
#include "pathnames.h"
#include "defs.h"
#include "debug.h"
#include "mld6.h"
#include "pim6.h"
#include "vif.h"
#include "routesock.h"
#include "callout.h"
#include "mrt.h"
#include "timer.h"
#include "rp.h"
#include "kern.h"
#include "cfparse.h"
char configfilename[256] = _PATH_PIM6D_CONF;
char versionstring[100];
char logfilename[256] = _PATH_PIM6D_LOGFILE;
/* TODO: not used
static char genidfilename[] = _PATH_PIM6D_GENID;
*/
static char pidfilename[] = _PATH_PIM6D_PID;
FILE *log_fp = stderr;
char *progname;
static int foreground = 0;
static int sighandled = 0;
#define GOT_SIGINT 0x01
#define GOT_SIGHUP 0x02
#define GOT_SIGUSR1 0x04
#define GOT_SIGUSR2 0x08
#define GOT_SIGALRM 0x10
#define GOT_SIGINFO 0x20
#define NHANDLERS 3
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[] = {
{ "mld_proto", DEBUG_MLD_PROTO, 5 },
{ "mld_timer", DEBUG_MLD_TIMER, 5 },
{ "mld_member", DEBUG_MLD_MEMBER, 5 },
{ "mld", DEBUG_MLD, 3 },
{ "switch", DEBUG_SWITCH, 2 },
{ "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_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));
/* 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=0,
n,
i,
secs;
extern char todaysversion[];
struct sigaction sa;
struct debugname *d;
char c;
int tmpd;
setlinebuf(stderr);
if (geteuid() != 0)
{
fprintf(stderr, "pim6sd: 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;
int no=0;
argv++;
argc--;
debug = 0;
p = *argv;
q = NULL;
while (p)
{
q = strchr(p, ',');
if (q)
*q++ = '\0';
if(p[0]=='-')
{
no=1;
p++;
}
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;
}
if(no)
{
debug &=~d->level;
no=0;
}
else
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;
}
else if (strcmp(*argv, "-f") == 0)
foreground = 1;
else
goto usage;
argv++;
argc--;
}
if (argc > 0)
{
usage:
tmpd = 0xffffffff;
fprintf(stderr, "usage: pim6sd [-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("pim6sd", LOG_PID, LOG_DAEMON);
// (void) setlogmask(LOG_UPTO(LOG_NOTICE));
#else
(void) openlog("pim6sd", LOG_PID);
#endif /* LOG_DAEMON */
/* open a log file */
if ((log_fp = fopen(logfilename, "w")) == NULL)
log(LOG_ERR, errno, "fopen(%s)", logfilename);
setlinebuf(log_fp);
sprintf(versionstring, "pim6sd version %s", todaysversion);
log(LOG_INFO, 0, "%s starting", versionstring);
/*
* TODO: XXX: use a combination of time and hostid to initialize the
* random generator.
*/
#ifdef SYSV
srand48(time(NULL));
#else
srandom(time(NULL));
#endif
callout_init();
init_mld6();
init_pim6();
#ifdef HAVE_ROUTING_SOCKETS
init_routesock();
#endif /* HAVE_ROUTING_SOCKETS */
init_pim6_mrt();
init_timers();
/* TODO: check the kernel DVMRP/MROUTED/PIM support version */
init_vifs();
init_rp6_and_bsr6(); /* Must be after init_vifs() */
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);
sigaction(SIGINFO, &sa, NULL);
FD_ZERO(&readers);
FD_SET(mld6_socket, &readers);
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(log_fp);
IF_DEBUG(DEBUG_PIM_MRT)
dump_pim_mrt(log_fp);
/* schedule first timer interrupt */
timer_setTimer(timer_interval, timer, NULL);
if (foreground == 0)
{
/* Detach from the terminal */
#ifdef TIOCNOTTY
int t;
#endif /* TIOCNOTTY */
if (fork())
exit(0);
#ifdef HAVE_ROUTING_SOCKETS
pid = getpid();
#endif
(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 */
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_SIGINFO)
{
sighandled &= ~GOT_SIGINFO;
dump_stat();
}
if (sighandled & GOT_SIGUSR1)
{
sighandled &= ~GOT_SIGUSR1;
fdump(SIGUSR1);
}
if (sighandled & GOT_SIGUSR2)
{
sighandled &= ~GOT_SIGUSR2;
#ifdef notyet
cdump(SIGUSR2);
#else
cfparse(0, 1); /* reset debug level */
#endif
}
if (sighandled & GOT_SIGALRM)
{
sighandled &= ~GOT_SIGALRM;
timer(&dummysigalrm);
}
}
if ((n = select(nfds, &rfds, NULL, NULL, timeout)) < 0)
{
if (errno != EINTR)
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)
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)
{
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.
* this granularity is configurable ( see file pim6sd.conf.sample)
*/
static void
timer(i)
void *i;
{
age_vifs(); /* Timeout neighbors and groups */
age_routes(); /* Timeout routing entries */
age_misc(); /* Timeout the rest (Cand-RP list, etc) */
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()
{
/*
* TODO: XXX (not in the spec): if I am the BSR, somehow inform the other
* routers I am going down and need to elect another BSR? (probably by
* sending a the Cand-RP-set with my_priority=LOWEST?)
*
*/
k_stop_pim(mld6_socket);
}
/*
* 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;
case SIGINFO:
sighandled |= GOT_SIGINFO;
break;
}
}
/* TODO: not verified */
/*
* Restart the daemon
*/
static void
restart(i)
int i;
{
log(LOG_NOTICE, 0, "% 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();
init_vifs();
/* schedule timer interrupts */
timer_setTimer(timer_interval, timer, NULL);
}
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