/* $NetBSD: mrinfo.c,v 1.4 1995/12/10 11:00:51 mycroft Exp $ */ /* * This tool requests configuration info from a multicast router * and prints the reply (if any). Invoke it as: * * mrinfo router-name-or-address * * Written Wed Mar 24 1993 by Van Jacobson (adapted from the * multicast mapper written by Pavel Curtis). * * The lawyers insist we include the following UC copyright notice. * The mapper from which this is derived contained a Xerox copyright * notice which follows the UC one. Try not to get depressed noting * that the legal gibberish is larger than the program. * * Copyright (c) 1993 Regents of the University of California. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the Computer Systems * Engineering Group at Lawrence Berkeley Laboratory. * 4. Neither the name of the University nor of the Laboratory may be used * to endorse or promote products derived from this software without * specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * --------------------------------- * Copyright (c) Xerox Corporation 1992. All rights reserved. * * License is granted to copy, to use, and to make and to use derivative works * for research and evaluation purposes, provided that Xerox is acknowledged * in all documentation pertaining to any such copy or derivative work. Xerox * grants no other licenses expressed or implied. The Xerox trade name should * not be used in any advertising without its written permission. * * XEROX CORPORATION MAKES NO REPRESENTATIONS CONCERNING EITHER THE * MERCHANTABILITY OF THIS SOFTWARE OR THE SUITABILITY OF THIS SOFTWARE FOR * ANY PARTICULAR PURPOSE. The software is provided "as is" without express * or implied warranty of any kind. * * These notices must be retained in any copies of any part of this software. */ #ifndef lint static char rcsid[] = "@(#) $NetBSD: mrinfo.c,v 1.4 1995/12/10 11:00:51 mycroft Exp $"; /* original rcsid: "@(#) Header: mrinfo.c,v 1.6 93/04/08 15:14:16 van Exp (LBL)"; */ #endif #include #include #include #include "defs.h" #include #ifdef __STDC__ #include #else #include #endif #define DEFAULT_TIMEOUT 4 /* How long to wait before retrying requests */ #define DEFAULT_RETRIES 3 /* How many times to ask each router */ u_int32_t our_addr, target_addr = 0; /* in NET order */ int debug = 0; int nflag = 0; int retries = DEFAULT_RETRIES; int timeout = DEFAULT_TIMEOUT; int target_level = 0; vifi_t numvifs; /* to keep loader happy */ /* (see COPY_TABLES macro called in kern.c) */ char * inet_name __P((u_int32_t addr)); void ask __P((u_int32_t dst)); void ask2 __P((u_int32_t dst)); int get_number __P((int *var, int deflt, char ***pargv, int *pargc)); u_int32_t host_addr __P((char *name)); void usage __P((void)); /* to shut up -Wstrict-prototypes */ int main __P((int argc, char *argv[])); char * inet_name(addr) u_int32_t addr; { struct hostent *e; struct in_addr in; if (addr == 0) return "local"; if (nflag || (e = gethostbyaddr((char *)&addr, sizeof(addr), AF_INET)) == NULL) { in.s_addr = addr; return (inet_ntoa(in)); } return (e->h_name); } /* * Log errors and other messages 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; char fmt[100]; va_start(ap, format); #else void log(severity, syserr, format, va_alist) int severity, syserr; char *format; va_dcl { va_list ap; char fmt[100]; va_start(ap); #endif switch (debug) { case 0: if (severity > LOG_WARNING) return; case 1: if (severity > LOG_NOTICE) return; case 2: if (severity > LOG_INFO) return; default: fmt[0] = '\0'; if (severity == LOG_WARNING) strcat(fmt, "warning - "); strncat(fmt, format, 80); vfprintf(stderr, fmt, ap); if (syserr == 0) fputc('\n', stderr); else if (syserr < sys_nerr) fprintf(stderr, ": %s\n", sys_errlist[syserr]); else fprintf(stderr, ": errno %d\n", syserr); } if (severity <= LOG_ERR) exit(-1); } /* * Send a neighbors-list request. */ void ask(dst) u_int32_t dst; { send_igmp(our_addr, dst, IGMP_DVMRP, DVMRP_ASK_NEIGHBORS, htonl(MROUTED_LEVEL), 0); } void ask2(dst) u_int32_t dst; { send_igmp(our_addr, dst, IGMP_DVMRP, DVMRP_ASK_NEIGHBORS2, htonl(MROUTED_LEVEL), 0); } /* * Process an incoming neighbor-list message. */ void accept_neighbors(src, dst, p, datalen, level) u_int32_t src, dst, level; u_char *p; int datalen; { u_char *ep = p + datalen; #define GET_ADDR(a) (a = ((u_int32_t)*p++ << 24), a += ((u_int32_t)*p++ << 16),\ a += ((u_int32_t)*p++ << 8), a += *p++) printf("%s (%s):\n", inet_fmt(src, s1), inet_name(src)); while (p < ep) { register u_int32_t laddr; register u_char metric; register u_char thresh; register int ncount; GET_ADDR(laddr); laddr = htonl(laddr); metric = *p++; thresh = *p++; ncount = *p++; while (--ncount >= 0) { register u_int32_t neighbor; GET_ADDR(neighbor); neighbor = htonl(neighbor); printf(" %s -> ", inet_fmt(laddr, s1)); printf("%s (%s) [%d/%d]\n", inet_fmt(neighbor, s1), inet_name(neighbor), metric, thresh); } } } void accept_neighbors2(src, dst, p, datalen, level) u_int32_t src, dst, level; u_char *p; int datalen; { u_char *ep = p + datalen; u_int broken_cisco = ((level & 0xffff) == 0x020a); /* 10.2 */ /* well, only possibly_broken_cisco, but that's too long to type. */ printf("%s (%s) [version %d.%d", inet_fmt(src, s1), inet_name(src), level & 0xff, (level >> 8) & 0xff); if ((level >> 16) & NF_LEAF) { printf (",leaf"); } if ((level >> 16) & NF_PRUNE) { printf (",prune"); } if ((level >> 16) & NF_GENID) { printf (",genid"); } if ((level >> 16) & NF_MTRACE) { printf (",mtrace"); } printf ("]:\n"); while (p < ep) { register u_char metric; register u_char thresh; register u_char flags; register int ncount; register u_int32_t laddr = *(u_int32_t*)p; p += 4; metric = *p++; thresh = *p++; flags = *p++; ncount = *p++; if (broken_cisco && ncount == 0) /* dumb Ciscos */ ncount = 1; if (broken_cisco && ncount > 15) /* dumb Ciscos */ ncount = ncount & 0xf; while (--ncount >= 0 && p < ep) { register u_int32_t neighbor = *(u_int32_t*)p; p += 4; printf(" %s -> ", inet_fmt(laddr, s1)); printf("%s (%s) [%d/%d", inet_fmt(neighbor, s1), inet_name(neighbor), metric, thresh); if (flags & DVMRP_NF_TUNNEL) printf("/tunnel"); if (flags & DVMRP_NF_SRCRT) printf("/srcrt"); if (flags & DVMRP_NF_PIM) printf("/pim"); if (flags & DVMRP_NF_QUERIER) printf("/querier"); if (flags & DVMRP_NF_DISABLED) printf("/disabled"); if (flags & DVMRP_NF_DOWN) printf("/down"); if (flags & DVMRP_NF_LEAF) printf("/leaf"); printf("]\n"); } } } int get_number(var, deflt, pargv, pargc) int *var, *pargc, deflt; char ***pargv; { if ((*pargv)[0][2] == '\0') { /* Get the value from the next * argument */ if (*pargc > 1 && isdigit((*pargv)[1][0])) { (*pargv)++, (*pargc)--; *var = atoi((*pargv)[0]); return 1; } else if (deflt >= 0) { *var = deflt; return 1; } else return 0; } else { /* Get value from the rest of this argument */ if (isdigit((*pargv)[0][2])) { *var = atoi((*pargv)[0] + 2); return 1; } else { return 0; } } } void usage() { fprintf(stderr, "Usage: mrinfo [-n] [-t timeout] [-r retries] [router]\n"); exit(1); } int main(argc, argv) int argc; char *argv[]; { int tries; int trynew; struct timeval et; struct hostent *hp; struct hostent bogus; char *host; int curaddr; if (geteuid() != 0) { fprintf(stderr, "mrinfo: must be root\n"); exit(1); } init_igmp(); setuid(getuid()); setlinebuf(stderr); argv++, argc--; while (argc > 0 && argv[0][0] == '-') { switch (argv[0][1]) { case 'd': if (!get_number(&debug, DEFAULT_DEBUG, &argv, &argc)) usage(); break; case 'n': ++nflag; break; case 'r': if (!get_number(&retries, -1, &argv, &argc)) usage(); break; case 't': if (!get_number(&timeout, -1, &argv, &argc)) usage(); break; default: usage(); } argv++, argc--; } if (argc > 1) usage(); if (argc == 1) host = argv[0]; else host = "127.0.0.1"; if ((target_addr = inet_addr(host)) != -1) { hp = &bogus; hp->h_length = sizeof(target_addr); if (!(hp->h_addr_list = (char **)malloc(2 * sizeof(char *)))) err(1, "can't allocate memory"); if (!(hp->h_addr_list[0] = malloc(hp->h_length))) err(1, "can't allocate memory"); memcpy(hp->h_addr_list[0], &target_addr, hp->h_length); hp->h_addr_list[1] = 0; } else hp = gethostbyname(host); if (hp == NULL) { fprintf(stderr, "mrinfo: %s: no such host\n", argv[0]); exit(1); } if (debug) fprintf(stderr, "Debug level %u\n", debug); /* Check all addresses; mrouters often have unreachable interfaces */ for (curaddr = 0; hp->h_addr_list[curaddr] != NULL; curaddr++) { memcpy(&target_addr, hp->h_addr_list[curaddr], hp->h_length); { /* Find a good local address for us. */ int udp; struct sockaddr_in addr; int addrlen = sizeof(addr); addr.sin_family = AF_INET; #if (defined(BSD) && (BSD >= 199103)) addr.sin_len = sizeof addr; #endif addr.sin_addr.s_addr = target_addr; addr.sin_port = htons(2000); /* any port over 1024 will * do... */ if ((udp = socket(AF_INET, SOCK_DGRAM, 0)) < 0 || connect(udp, (struct sockaddr *) & addr, sizeof(addr)) < 0 || getsockname(udp, (struct sockaddr *) & addr, &addrlen) < 0) { perror("Determining local address"); exit(-1); } close(udp); our_addr = addr.sin_addr.s_addr; } tries = 0; trynew = 1; /* * New strategy: send 'ask2' for two timeouts, then fall back * to 'ask', since it's not very likely that we are going to * find someone who only responds to 'ask' these days */ ask2(target_addr); gettimeofday(&et, 0); et.tv_sec += timeout; /* Main receive loop */ for (;;) { fd_set fds; struct timeval tv, now; int count, recvlen, dummy = 0; register u_int32_t src, dst, group; struct ip *ip; struct igmp *igmp; int ipdatalen, iphdrlen, igmpdatalen; FD_ZERO(&fds); FD_SET(igmp_socket, &fds); gettimeofday(&now, 0); tv.tv_sec = et.tv_sec - now.tv_sec; tv.tv_usec = et.tv_usec - now.tv_usec; if (tv.tv_usec < 0) { tv.tv_usec += 1000000L; --tv.tv_sec; } if (tv.tv_sec < 0) tv.tv_sec = tv.tv_usec = 0; count = select(igmp_socket + 1, &fds, 0, 0, &tv); if (count < 0) { if (errno != EINTR) perror("select"); continue; } else if (count == 0) { log(LOG_DEBUG, 0, "Timed out receiving neighbor lists"); if (++tries > retries) break; /* If we've tried ASK_NEIGHBORS2 twice with * no response, fall back to ASK_NEIGHBORS */ if (tries == 2 && target_level == 0) trynew = 0; if (target_level == 0 && trynew == 0) ask(target_addr); else ask2(target_addr); gettimeofday(&et, 0); et.tv_sec += timeout; continue; } recvlen = recvfrom(igmp_socket, recv_buf, RECV_BUF_SIZE, 0, NULL, &dummy); if (recvlen <= 0) { if (recvlen && errno != EINTR) perror("recvfrom"); continue; } if (recvlen < sizeof(struct ip)) { log(LOG_WARNING, 0, "packet too short (%u bytes) for IP header", recvlen); continue; } ip = (struct ip *) recv_buf; if (ip->ip_p == 0) continue; /* Request to install cache entry */ src = ip->ip_src.s_addr; dst = ip->ip_dst.s_addr; iphdrlen = ip->ip_hl << 2; ipdatalen = ip->ip_len; if (iphdrlen + ipdatalen != recvlen) { log(LOG_WARNING, 0, "packet shorter (%u bytes) than hdr+data length (%u+%u)", recvlen, iphdrlen, ipdatalen); continue; } igmp = (struct igmp *) (recv_buf + iphdrlen); group = igmp->igmp_group.s_addr; igmpdatalen = ipdatalen - IGMP_MINLEN; if (igmpdatalen < 0) { log(LOG_WARNING, 0, "IP data field too short (%u bytes) for IGMP, from %s", ipdatalen, inet_fmt(src, s1)); continue; } if (igmp->igmp_type != IGMP_DVMRP) continue; switch (igmp->igmp_code) { case DVMRP_NEIGHBORS: case DVMRP_NEIGHBORS2: if (src != target_addr) { fprintf(stderr, "mrinfo: got reply from %s", inet_fmt(src, s1)); fprintf(stderr, " instead of %s\n", inet_fmt(target_addr, s1)); /*continue;*/ } break; default: continue; /* ignore all other DVMRP messages */ } switch (igmp->igmp_code) { case DVMRP_NEIGHBORS: if (group) { /* knows about DVMRP_NEIGHBORS2 msg */ if (target_level == 0) { target_level = ntohl(group); ask2(target_addr); } } else { accept_neighbors(src, dst, (u_char *)(igmp + 1), igmpdatalen, ntohl(group)); exit(0); } break; case DVMRP_NEIGHBORS2: accept_neighbors2(src, dst, (u_char *)(igmp + 1), igmpdatalen, ntohl(group)); exit(0); } } } exit(1); } /* dummies */ void accept_probe(src, dst, p, datalen, level) u_int32_t src, dst, level; char *p; int datalen; { } void accept_group_report(src, dst, group, r_type) u_int32_t src, dst, group; int r_type; { } void accept_neighbor_request2(src, dst) u_int32_t src, dst; { } void accept_report(src, dst, p, datalen, level) u_int32_t src, dst, level; char *p; int datalen; { } void accept_neighbor_request(src, dst) u_int32_t src, dst; { } void accept_prune(src, dst, p, datalen) u_int32_t src, dst; char *p; int datalen; { } void accept_graft(src, dst, p, datalen) u_int32_t src, dst; char *p; int datalen; { } void accept_g_ack(src, dst, p, datalen) u_int32_t src, dst; char *p; int datalen; { } void add_table_entry(origin, mcastgrp) u_int32_t origin, mcastgrp; { } void check_vif_state() { } void accept_leave_message(src, dst, group) u_int32_t src, dst, group; { } void accept_mtrace(src, dst, group, data, no, datalen) u_int32_t src, dst, group; char *data; u_int no; int datalen; { } void accept_membership_query(src, dst, group, tmo) u_int32_t src, dst, group; int tmo; { } void accept_info_request(src, dst, p, datalen) u_int32_t src, dst; u_char *p; int datalen; { } void accept_info_reply(src, dst, p, datalen) u_int32_t src, dst; u_char *p; int datalen; { }