720 lines
19 KiB
C
720 lines
19 KiB
C
/*
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* Copyright (c) 1998 by the University of Oregon.
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* All rights reserved.
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*
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* Permission to use, copy, modify, and distribute this software and
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* its documentation in source and binary forms for lawful
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* purposes and without fee is hereby granted, provided
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* that the above copyright notice appear in all copies and that both
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* the copyright notice and this permission notice appear in supporting
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* documentation, and that any documentation, advertising materials,
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* and other materials related to such distribution and use acknowledge
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* that the software was developed by the University of Oregon.
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* The name of the University of Oregon may not be used to endorse or
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* promote products derived from this software without specific prior
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* written permission.
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*
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* THE UNIVERSITY OF OREGON DOES NOT MAKE ANY REPRESENTATIONS
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* ABOUT THE SUITABILITY OF THIS SOFTWARE FOR ANY PURPOSE. THIS SOFTWARE IS
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* PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND
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* NON-INFRINGEMENT.
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*
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* IN NO EVENT SHALL UO, OR ANY OTHER CONTRIBUTOR BE LIABLE FOR ANY
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* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES, WHETHER IN CONTRACT,
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* TORT, OR OTHER FORM OF ACTION, ARISING OUT OF OR IN CONNECTION WITH,
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* THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* Other copyrights might apply to parts of this software and are so
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* noted when applicable.
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*/
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/*
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* Questions concerning this software should be directed to
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* Kurt Windisch (kurtw@antc.uoregon.edu)
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*
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* $Id: main.c,v 1.4 2000/10/05 22:20:38 itojun Exp $
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*/
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/*
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* Part of this program has been derived from PIM sparse-mode pimd.
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* The pimd program is covered by the license in the accompanying file
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* named "LICENSE.pimd".
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*
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* The pimd program is COPYRIGHT 1998 by University of Southern California.
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*
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* Part of this program has been derived from mrouted.
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* The mrouted program is covered by the license in the accompanying file
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* named "LICENSE.mrouted".
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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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* $FreeBSD$
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*/
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#include "defs.h"
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#ifdef SNMP
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#include "snmp.h"
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#endif
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char configfilename[256] = _PATH_PIM6D_CONF;
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char versionstring[100];
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static char pidfilename[] = _PATH_PIM6D_PID;
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/* TODO: not used
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static char genidfilename[] = _PATH_PIM6D_GENID;
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*/
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int haveterminal = 1;
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char *progname;
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static int sighandled = 0;
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#define GOT_SIGINT 0x01
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#define GOT_SIGHUP 0x02
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#define GOT_SIGUSR1 0x04
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#define GOT_SIGUSR2 0x08
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#define GOT_SIGALRM 0x10
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#ifdef SNMP
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#define NHANDLERS 34
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#else
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#define NHANDLERS 3
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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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static struct debugname {
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char *name;
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int level;
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int nchars;
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} debugnames[] = {
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#if 0
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{ "dvmrp_detail", DEBUG_DVMRP_DETAIL, 5 },
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{ "dvmrp_prunes", DEBUG_DVMRP_PRUNE, 8 },
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{ "dvmrp_pruning", DEBUG_DVMRP_PRUNE, 8 },
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{ "dvmrp_mrt", DEBUG_DVMRP_ROUTE, 7 },
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{ "dvmrp_routes", DEBUG_DVMRP_ROUTE, 7 },
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{ "dvmrp_routing", DEBUG_DVMRP_ROUTE, 7 },
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{ "dvmrp_neighbors", DEBUG_DVMRP_PEER, 7 },
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{ "dvmrp_peers", DEBUG_DVMRP_PEER, 8 },
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{ "dvmrp_hello", DEBUG_DVMRP_PEER, 7 },
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{ "dvmrp_timers", DEBUG_DVMRP_TIMER, 7 },
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{ "dvmrp", DEBUG_DVMRP, 1 },
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{ "igmp_proto", DEBUG_IGMP_PROTO, 6 },
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{ "igmp_timers", DEBUG_IGMP_TIMER, 6 },
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{ "igmp_members", DEBUG_IGMP_MEMBER, 6 },
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{ "groups", DEBUG_MEMBER, 1 },
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{ "membership", DEBUG_MEMBER, 2 },
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{ "igmp", DEBUG_IGMP, 1 },
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#endif
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{ "trace", DEBUG_TRACE, 2 },
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{ "mtrace", DEBUG_TRACE, 2 },
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{ "traceroute", DEBUG_TRACE, 2 },
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{ "timeout", DEBUG_TIMEOUT, 2 },
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{ "callout", DEBUG_TIMEOUT, 3 },
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{ "pkt", DEBUG_PKT, 2 },
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{ "packets", DEBUG_PKT, 2 },
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{ "interfaces", DEBUG_IF, 2 },
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{ "vif", DEBUG_IF, 1 },
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{ "kernel", DEBUG_KERN, 2 },
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{ "cache", DEBUG_MFC, 1 },
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{ "mfc", DEBUG_MFC, 2 },
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{ "k_cache", DEBUG_MFC, 2 },
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{ "k_mfc", DEBUG_MFC, 2 },
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{ "rsrr", DEBUG_RSRR, 2 },
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{ "pim_detail", DEBUG_PIM_DETAIL, 5 },
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{ "pim_hello", DEBUG_PIM_HELLO, 5 },
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{ "pim_neighbors", DEBUG_PIM_HELLO, 5 },
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{ "pim_register", DEBUG_PIM_REGISTER, 5 },
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{ "registers", DEBUG_PIM_REGISTER, 2 },
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{ "pim_join_prune", DEBUG_PIM_JOIN_PRUNE, 5 },
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{ "pim_j_p", DEBUG_PIM_JOIN_PRUNE, 5 },
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{ "pim_jp", DEBUG_PIM_JOIN_PRUNE, 5 },
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{ "pim_graft", DEBUG_PIM_GRAFT, 5 },
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{ "pim_bootstrap", DEBUG_PIM_BOOTSTRAP, 5 },
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{ "pim_bsr", DEBUG_PIM_BOOTSTRAP, 5 },
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{ "bsr", DEBUG_PIM_BOOTSTRAP, 1 },
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{ "bootstrap", DEBUG_PIM_BOOTSTRAP, 1 },
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{ "pim_asserts", DEBUG_PIM_ASSERT, 5 },
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{ "pim_cand_rp", DEBUG_PIM_CAND_RP, 5 },
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{ "pim_c_rp", DEBUG_PIM_CAND_RP, 5 },
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{ "pim_rp", DEBUG_PIM_CAND_RP, 6 },
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{ "rp", DEBUG_PIM_CAND_RP, 2 },
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{ "pim_routes", DEBUG_PIM_MRT, 6 },
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{ "pim_routing", DEBUG_PIM_MRT, 6 },
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{ "pim_mrt", DEBUG_PIM_MRT, 5 },
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{ "pim_timers", DEBUG_PIM_TIMER, 5 },
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{ "pim_rpf", DEBUG_PIM_RPF, 6 },
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{ "rpf", DEBUG_RPF, 3 },
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{ "pim", DEBUG_PIM, 1 },
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{ "routes", DEBUG_MRT, 1 },
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{ "routing", DEBUG_MRT, 1 },
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{ "mrt", DEBUG_MRT, 1 },
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{ "routers", DEBUG_NEIGHBORS, 6 },
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{ "mrouters", DEBUG_NEIGHBORS, 7 },
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{ "neighbors", DEBUG_NEIGHBORS, 1 },
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{ "timers", DEBUG_TIMER, 1 },
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{ "asserts", DEBUG_ASSERT, 1 },
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{ "all", DEBUG_ALL, 2 },
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{ "3", 0xffffffff, 1 } /* compat. */
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};
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/*
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* Forward declarations.
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*/
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static void handler __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 restart __P((int));
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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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int dummy, dummysigalrm;
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FILE *fp;
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struct timeval tv, difftime, curtime, lasttime, *timeout;
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fd_set rfds, readers;
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int nfds, n, i, secs;
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extern char todaysversion[];
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struct sigaction sa;
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struct debugname *d;
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char c;
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int tmpd;
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setlinebuf(stderr);
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if (geteuid() != 0) {
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fprintf(stderr, "pim6dd: must be root\n");
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exit(1);
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}
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progname = strrchr(argv[0], '/');
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if (progname)
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progname++;
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else
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progname = argv[0];
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argv++;
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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 && *(argv + 1)[0] != '-') {
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char *p,*q;
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int i, len;
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struct debugname *d;
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argv++;
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argc--;
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debug = 0;
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p = *argv; q = NULL;
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while (p) {
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q = strchr(p, ',');
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if (q)
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*q++ = '\0';
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len = strlen(p);
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for (i = 0, d = debugnames;
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i < sizeof(debugnames) / sizeof(debugnames[0]);
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i++, d++)
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if (len >= d->nchars && strncmp(d->name, p, len) == 0)
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break;
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if (i == sizeof(debugnames) / sizeof(debugnames[0])) {
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int j = 0xffffffff;
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int k = 0;
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fprintf(stderr, "Valid debug levels: ");
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for (i = 0, d = debugnames;
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i < sizeof(debugnames) / sizeof(debugnames[0]);
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i++, d++) {
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if ((j & d->level) == d->level) {
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if (k++)
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putc(',', stderr);
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fputs(d->name, stderr);
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j &= ~d->level;
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}
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}
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putc('\n', stderr);
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goto usage;
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}
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debug |= d->level;
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p = q;
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}
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}
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else
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debug = DEBUG_DEFAULT;
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}
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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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strcpy(configfilename, *argv);
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}
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else
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goto usage;
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/* TODO: not implemented */
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#ifdef SNMP
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}
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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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}
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else
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dest_port = DEFAULT_PORT;
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#endif
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}
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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:
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tmpd = 0xffffffff;
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fprintf(stderr, "usage: pim6dd [-c configfile] [-d [debug_level][,debug_level]]\n");
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fprintf(stderr, "debug levels: ");
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c = '(';
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for (d = debugnames; d < debugnames +
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sizeof(debugnames) / sizeof(debugnames[0]); d++) {
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if ((tmpd & d->level) == d->level) {
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tmpd &= ~d->level;
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fprintf(stderr, "%c%s", c, d->name);
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c = ',';
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}
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}
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fprintf(stderr, ")\n");
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exit(1);
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}
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if (debug != 0) {
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tmpd = debug;
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fprintf(stderr, "debug level 0x%lx ", debug);
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c = '(';
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for (d = debugnames; d < debugnames +
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sizeof(debugnames) / sizeof(debugnames[0]); d++) {
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if ((tmpd & d->level) == d->level) {
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tmpd &= ~d->level;
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fprintf(stderr, "%c%s", c, d->name);
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c = ',';
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}
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}
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fprintf(stderr, ")\n");
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}
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#ifdef LOG_DAEMON
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(void)openlog("pim6dd", 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("pim6dd", LOG_PID);
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#endif /* LOG_DAEMON */
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sprintf(versionstring, "pim6dd version %s", todaysversion);
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log(LOG_DEBUG, 0, "%s starting", versionstring);
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/* TODO: XXX: use a combination of time and hostid to initialize the random
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* generator.
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*/
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#ifdef SYSV
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srand48(time(NULL));
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#else
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{
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struct timeval tm;
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gettimeofday(&tm, NULL);
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srandom(tm.tv_usec + gethostid());
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}
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#endif
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callout_init();
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/* Start up the log rate-limiter */
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resetlogging(NULL);
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init_mld6();
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#if 0
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k_stop_pim(mld6_socket);
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exit(0); /* XXX */
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#endif
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init_pim6();
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init_pim6_mrt();
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init_timers();
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/* TODO: check the kernel DVMRP/MROUTED/PIM support version */
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#ifdef SNMP
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if (i = snmp_init())
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return i;
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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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sa.sa_handler = handler;
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sa.sa_flags = 0; /* Interrupt system calls */
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sigemptyset(&sa.sa_mask);
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sigaction(SIGALRM, &sa, NULL);
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sigaction(SIGHUP, &sa, NULL);
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sigaction(SIGTERM, &sa, NULL);
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sigaction(SIGINT, &sa, NULL);
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sigaction(SIGUSR1, &sa, NULL);
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sigaction(SIGUSR2, &sa, NULL);
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FD_ZERO(&readers);
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FD_SET(mld6_socket, &readers);
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nfds = mld6_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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IF_DEBUG(DEBUG_IF)
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dump_vifs(stderr);
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IF_DEBUG(DEBUG_PIM_MRT)
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dump_pim_mrt(stderr);
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/* schedule first timer interrupt */
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timer_setTimer(TIMER_INTERVAL, timer, NULL);
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if (debug == 0) {
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/* Detach from the terminal */
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#ifdef TIOCNOTTY
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int t;
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#endif /* TIOCNOTTY */
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haveterminal = 0;
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if (fork())
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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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#if defined(SYSV) || defined(linux)
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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 /* TIOCNOTTY */
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#endif /* SYSV */
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} /* End of child process code */
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#ifdef HAVE_ROUTING_SOCKETS
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init_routesock();
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#endif /* HAVE_ROUTING_SOCKETS */
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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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/*
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* Main receive loop.
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*/
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dummy = 0;
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dummysigalrm = SIGALRM;
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difftime.tv_usec = 0;
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gettimeofday(&curtime, NULL);
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lasttime = curtime;
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for(;;) {
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bcopy((char *)&readers, (char *)&rfds, sizeof(rfds));
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secs = timer_nextTimer();
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if (secs == -1)
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timeout = NULL;
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else {
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timeout = &tv;
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timeout->tv_sec = secs;
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timeout->tv_usec = 0;
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}
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if (sighandled) {
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if (sighandled & GOT_SIGINT) {
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sighandled &= ~GOT_SIGINT;
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break;
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}
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if (sighandled & GOT_SIGHUP) {
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sighandled &= ~GOT_SIGHUP;
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restart(SIGHUP);
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}
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if (sighandled & GOT_SIGUSR1) {
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sighandled &= ~GOT_SIGUSR1;
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fdump(SIGUSR1);
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}
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if (sighandled & GOT_SIGUSR2) {
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sighandled &= ~GOT_SIGUSR2;
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cdump(SIGUSR2);
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}
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if (sighandled & GOT_SIGALRM) {
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sighandled &= ~GOT_SIGALRM;
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timer(&dummysigalrm);
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}
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}
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if ((n = select(nfds, &rfds, NULL, NULL, timeout)) < 0) {
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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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/*
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* Handle timeout queue.
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*
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* If select + packet processing took more than 1 second,
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* or if there is a timeout pending, age the timeout queue.
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*
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* If not, collect usec in difftime to make sure that the
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* time doesn't drift too badly.
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*
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* If the timeout handlers took more than 1 second,
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* age the timeout queue again. XXX This introduces the
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* potential for infinite loops!
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*/
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do {
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/*
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* If the select timed out, then there's no other
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* activity to account for and we don't need to
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* call gettimeofday.
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*/
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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);
|
|
}
|