/* $NetBSD: mtrace.c,v 1.41 2016/03/13 19:47:59 christos Exp $ */ /* * mtrace.c * * This tool traces the branch of a multicast tree from a source to a * receiver for a particular multicast group and gives statistics * about packet rate and loss for each hop along the path. It can * usually be invoked just as * * mtrace source * * to trace the route from that source to the local host for a default * group when only the route is desired and not group-specific packet * counts. See the usage line for more complex forms. * * * Released 4 Apr 1995. This program was adapted by Steve Casner * (USC/ISI) from a prototype written by Ajit Thyagarajan (UDel and * Xerox PARC). It attempts to parallel in command syntax and output * format the unicast traceroute program written by Van Jacobson (LBL) * for the parts where that makes sense. * * Copyright (c) 1998-2001. * The University of Southern California/Information Sciences Institute. * 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. Neither the name of the project nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE PROJECT 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 PROJECT 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. */ #include #ifndef lint __RCSID("$NetBSD: mtrace.c,v 1.41 2016/03/13 19:47:59 christos Exp $"); #endif #include #include #include #include #include #include #include #include #include #include #include #include "defs.h" #include #ifdef SUNOS5 #include #endif #define DEFAULT_TIMEOUT 3 /* How long to wait before retrying requests */ #define DEFAULT_RETRIES 3 /* How many times to try */ #define MAXHOPS UNREACHABLE /* Don't need more hops than max metric */ #define UNICAST_TTL 255 /* TTL for unicast response */ #define MULTICAST_TTL1 64 /* Default TTL for multicast query/response */ #define MULTICAST_TTL_INC 32 /* TTL increment for increase after timeout */ #define MULTICAST_TTL_MAX 192 /* Maximum TTL allowed (protect low-BW links */ struct resp_buf { u_long qtime; /* Time query was issued */ u_long rtime; /* Time response was received */ int len; /* Number of reports or length of data */ struct igmp igmp; /* IGMP header */ union { struct { struct tr_query q; /* Query/response header */ struct tr_resp r[MAXHOPS]; /* Per-hop reports */ } t; char d[MAX_DVMRP_DATA_LEN]; /* Neighbor data */ } u; } base, incr[2]; #define qhdr u.t.q #define resps u.t.r #define ndata u.d char names[MAXHOPS][40]; int reset[MAXHOPS]; /* To get around 3.4 bug, ... */ int swaps[MAXHOPS]; /* To get around 3.6 bug, ... */ int timeout = DEFAULT_TIMEOUT; int nqueries = DEFAULT_RETRIES; int numeric = FALSE; int debug = 0; int passive = FALSE; int multicast = FALSE; int statint = 10; int verbose = 0; u_int32_t defgrp; /* Default group if not specified */ u_int32_t query_cast; /* All routers multicast addr */ u_int32_t resp_cast; /* Mtrace response multicast addr */ u_int32_t lcl_addr = 0; /* This host address, in NET order */ u_int32_t dst_netmask; /* netmask to go with qdst */ /* * Query/response parameters, all initialized to zero and set later * to default values or from options. */ u_int32_t qsrc = 0; /* Source address in the query */ u_int32_t qgrp = 0; /* Group address in the query */ u_int32_t qdst = 0; /* Destination (receiver) address in query */ u_char qno = 0; /* Max number of hops to query */ u_int32_t raddr = 0; /* Address where response should be sent */ int qttl = 0; /* TTL for the query packet */ u_char rttl = 0; /* TTL for the response packet */ u_int32_t gwy = 0; /* User-supplied last-hop router address */ u_int32_t tdst = 0; /* Address where trace is sent (last-hop) */ vifi_t numvifs; /* to keep loader happy */ /* (see kern.c) */ u_long byteswap(u_long); const char * inet_name(u_int32_t addr); u_int32_t host_addr(const char *name); /* u_int is promoted u_char */ const char * proto_type(u_int type); const char * flag_type(u_int type); u_int32_t get_netmask(int s, u_int32_t dst); int get_ttl(struct resp_buf *buf); int t_diff(u_long a, u_long b); u_long fixtime(u_long time); int send_recv(u_int32_t dst, int type, int code, int tries, struct resp_buf *save); const char * print_host(u_int32_t addr); const char * print_host2(u_int32_t addr1, u_int32_t addr2); void print_trace(int index, struct resp_buf *buf); int what_kind(struct resp_buf *buf, const char *why); const char * scale(int *hop); void stat_line(struct tr_resp *r, struct tr_resp *s, int have_next, int *res); void fixup_stats(struct resp_buf *base, struct resp_buf *prev, struct resp_buf *new); int print_stats(struct resp_buf *base, struct resp_buf *prev, struct resp_buf *new); void check_vif_state(void); void passive_mode(void) __dead; int main(int argc, char *argv[]); /* logit() prototyped in defs.h */ const char * inet_name(u_int32_t addr) { struct hostent *e; e = gethostbyaddr((char *)&addr, sizeof(addr), AF_INET); return e ? e->h_name : "?"; } u_int32_t host_addr(const char *name) { struct hostent *e = (struct hostent *)0; u_int32_t addr; int i, dots = 3; char buf[40]; const char *ip = name; char *op = buf; /* * Undo BSD's favor -- take fewer than 4 octets as net/subnet address * if the name is all numeric. */ for (i = sizeof(buf) - 7; i > 0; --i) { if (*ip == '.') --dots; else if (*ip == '\0') break; else if (!isdigit((unsigned char)*ip)) dots = 0; /* Not numeric, don't add zeroes */ *op++ = *ip++; } for (i = 0; i < dots; ++i) { *op++ = '.'; *op++ = '0'; } *op = '\0'; if (dots <= 0) e = gethostbyname(name); if (e) memcpy((char *)&addr, e->h_addr_list[0], sizeof(addr)); else { addr = inet_addr(buf); if (addr == (in_addr_t)-1) { addr = 0; printf("Could not parse %s as host name or address\n", name); } } return addr; } const char * proto_type(u_int type) { static char buf[80]; switch (type) { case PROTO_DVMRP: return ("DVMRP"); case PROTO_MOSPF: return ("MOSPF"); case PROTO_PIM: return ("PIM"); case PROTO_CBT: return ("CBT"); case PROTO_PIM_SPEC: return ("PIM-special"); case PROTO_PIM_STAT: return ("PIM-static"); case PROTO_DVMRP_STAT: return ("DVMRP-static"); case PROTO_PIM_MBGP: return ("PIM/MBGP"); default: (void)snprintf(buf, sizeof buf, "Unknown protocol code %d", type); return (buf); } } const char * flag_type(u_int type) { static char buf[80]; switch (type) { case TR_NO_ERR: return (""); case TR_WRONG_IF: return ("Wrong interface"); case TR_PRUNED: return ("Prune sent upstream"); case TR_OPRUNED: return ("Output pruned"); case TR_SCOPED: return ("Hit scope boundary"); case TR_NO_RTE: return ("No route"); case TR_OLD_ROUTER: return ("Next router no mtrace"); case TR_NO_FWD: return ("Not forwarding"); case TR_NO_SPACE: return ("No space in packet"); case TR_RP_OR_CORE: return ("RP/Core"); case TR_RPF_INT: return ("Trace packet on RPT interface"); case TR_NO_MULTICAST: return ("Trace packet on non-MC interface"); case TR_ADMIN_DENY: return ("Trace admin-denied"); default: (void)snprintf(buf, sizeof buf, "Unknown error code %d", type); return (buf); } } /* * If destination is on a local net, get the netmask, else set the * netmask to all ones. There are two side effects: if the local * address was not explicitly set, and if the destination is on a * local net, use that one; in either case, verify that the local * address is valid. */ u_int32_t get_netmask(int s, u_int32_t dst) { u_int32_t if_addr, if_mask; u_int32_t retval = 0xFFFFFFFF; int found = FALSE; struct ifaddrs *ifap, *ifa; if (getifaddrs(&ifap) != 0) { perror("getifaddrs"); return (retval); } for (ifa = ifap; ifa; ifa = ifa->ifa_next) { if (ifa->ifa_addr->sa_family != AF_INET) continue; if_addr = ((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr; if_mask = ((struct sockaddr_in *)ifa->ifa_netmask)->sin_addr.s_addr; if ((dst & if_mask) == (if_addr & if_mask)) { retval = if_mask; if (lcl_addr == 0) lcl_addr = if_addr; } if (lcl_addr == if_addr) found = TRUE; } if (!found && lcl_addr != 0) { printf("Interface address is not valid\n"); exit(1); } freeifaddrs(ifap); return (retval); } int get_ttl(struct resp_buf *buf) { int rno; struct tr_resp *b; u_int ttl; if (buf && (rno = buf->len) > 0) { b = buf->resps + rno - 1; ttl = b->tr_fttl; while (--rno > 0) { --b; if (ttl < b->tr_fttl) ttl = b->tr_fttl; else ++ttl; } ttl += MULTICAST_TTL_INC; if (ttl < MULTICAST_TTL1) ttl = MULTICAST_TTL1; if (ttl > MULTICAST_TTL_MAX) ttl = MULTICAST_TTL_MAX; return (ttl); } else return(MULTICAST_TTL1); } /* * Calculate the difference between two 32-bit NTP timestamps and return * the result in milliseconds. */ int t_diff(u_long a, u_long b) { int d = a - b; return ((d * 125) >> 13); } /* * Fixup for incorrect time format in 3.3 mrouted. * This is possible because (JAN_1970 mod 64K) is quite close to 32K, * so correct and incorrect times will be far apart. */ u_long fixtime(u_long tim) { if (abs((int)(tim-base.qtime)) > 0x3FFFFFFF) tim = ((tim & 0xFFFF0000) + (JAN_1970 << 16)) + ((tim & 0xFFFF) << 14) / 15625; return (tim); } /* * Swap bytes for poor little-endian machines that don't byte-swap */ u_long byteswap(u_long v) { return ((v << 24) | ((v & 0xff00) << 8) | ((v >> 8) & 0xff00) | (v >> 24)); } int send_recv(u_int32_t dst, int type, int code, int tries, struct resp_buf *save) { struct pollfd set[1]; struct timeval tq, tr, tv; struct ip *ip; struct igmp *igmp; struct tr_query *query, *rquery; int ipdatalen, iphdrlen, igmpdatalen; u_int32_t local, group; int datalen; int count, recvlen; socklen_t dummy; int len; int i; if (type == IGMP_MTRACE_QUERY) { group = qgrp; datalen = sizeof(struct tr_query); } else { group = htonl(MROUTED_LEVEL); datalen = 0; } if (IN_MULTICAST(ntohl(dst))) local = lcl_addr; else local = INADDR_ANY; /* * If the reply address was not explicitly specified, start off * with the unicast address of this host. Then, if there is no * response after trying half the tries with unicast, switch to * the standard multicast reply address. If the TTL was also not * specified, set a multicast TTL and if needed increase it for the * last quarter of the tries. */ query = (struct tr_query *)(send_buf + MIN_IP_HEADER_LEN + IGMP_MINLEN); query->tr_raddr = raddr ? raddr : multicast ? resp_cast : lcl_addr; query->tr_rttl = rttl ? rttl : IN_MULTICAST(ntohl(query->tr_raddr)) ? get_ttl(save) : UNICAST_TTL; query->tr_src = qsrc; query->tr_dst = qdst; for (i = tries ; i > 0; --i) { if (tries == nqueries && raddr == 0) { if (i == ((nqueries + 1) >> 1)) { query->tr_raddr = resp_cast; if (rttl == 0) query->tr_rttl = get_ttl(save); } if (i <= ((nqueries + 3) >> 2) && rttl == 0) { query->tr_rttl += MULTICAST_TTL_INC; if (query->tr_rttl > MULTICAST_TTL_MAX) query->tr_rttl = MULTICAST_TTL_MAX; } } /* * Change the qid for each request sent to avoid being confused * by duplicate responses */ query->tr_qid = arc4random() >> 8; /* * Set timer to calculate delays, then send query */ gettimeofday(&tq, 0); send_igmp(local, dst, type, code, group, datalen); /* * Wait for response, discarding false alarms */ set[0].fd = igmp_socket; set[0].events = POLLIN; while (TRUE) { gettimeofday(&tv, 0); tv.tv_sec = tq.tv_sec + timeout - tv.tv_sec; tv.tv_usec = tq.tv_usec - tv.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 = poll(set, 1, tv.tv_sec * 1000 + tv.tv_usec / 1000); if (count < 0) { if (errno != EINTR) perror("select"); continue; } else if (count == 0) { printf("* "); fflush(stdout); break; } gettimeofday(&tr, 0); recvlen = recvfrom(igmp_socket, recv_buf, RECV_BUF_SIZE, 0, (struct sockaddr *)0, &dummy); if (recvlen <= 0) { if (recvlen && errno != EINTR) perror("recvfrom"); continue; } if (recvlen < (int)sizeof(struct ip)) { fprintf(stderr, "packet too short (%u bytes) for IP header", recvlen); continue; } ip = (struct ip *) recv_buf; if (ip->ip_p == 0) /* ignore cache creation requests */ continue; iphdrlen = ip->ip_hl << 2; ipdatalen = ip->ip_len; if (iphdrlen + ipdatalen != recvlen) { fprintf(stderr, "packet shorter (%u bytes) than hdr+data len (%u+%u)\n", recvlen, iphdrlen, ipdatalen); continue; } igmp = (struct igmp *) (recv_buf + iphdrlen); igmpdatalen = ipdatalen - IGMP_MINLEN; if (igmpdatalen < 0) { fprintf(stderr, "IP data field too short (%u bytes) for IGMP from %s\n", ipdatalen, inet_fmt(ip->ip_src.s_addr)); continue; } switch (igmp->igmp_type) { case IGMP_DVMRP: if (igmp->igmp_code != DVMRP_NEIGHBORS2) continue; len = igmpdatalen; /* * Accept DVMRP_NEIGHBORS2 response if it comes from the * address queried or if that address is one of the local * addresses in the response. */ if (ip->ip_src.s_addr != dst) { u_int32_t *p = (u_int32_t *)(igmp + 1); u_int32_t *ep = p + (len >> 2); while (p < ep) { u_int32_t laddr = *p++; int n = ntohl(*p++) & 0xFF; if (laddr == dst) { ep = p + 1; /* ensure p < ep after loop */ break; } p += n; } if (p >= ep) continue; } break; case IGMP_MTRACE_QUERY: /* For backward compatibility with 3.3 */ case IGMP_MTRACE_REPLY: if (igmpdatalen <= (int)QLEN) continue; if ((igmpdatalen - QLEN)%RLEN) { printf("packet with incorrect datalen\n"); continue; } /* * Ignore responses that don't match query. */ rquery = (struct tr_query *)(igmp + 1); if (rquery->tr_qid != query->tr_qid) continue; if (rquery->tr_src != qsrc) continue; if (rquery->tr_dst != qdst) continue; len = (igmpdatalen - QLEN)/RLEN; /* * Ignore trace queries passing through this node when * mtrace is run on an mrouter that is in the path * (needed only because IGMP_MTRACE_QUERY is accepted above * for backward compatibility with multicast release 3.3). */ if (igmp->igmp_type == IGMP_MTRACE_QUERY) { struct tr_resp *r = (struct tr_resp *)(rquery+1) + len - 1; u_int32_t smask; VAL_TO_MASK(smask, r->tr_smask); if (len < code && (r->tr_inaddr & smask) != (qsrc & smask) && r->tr_rmtaddr != 0 && !(r->tr_rflags & 0x80)) continue; } /* * A match, we'll keep this one. */ if (len > code) { fprintf(stderr, "Num hops received (%d) exceeds request (%d)\n", len, code); } rquery->tr_raddr = query->tr_raddr; /* Insure these are */ rquery->tr_rttl = query->tr_rttl; /* as we sent them */ break; default: continue; } /* * Most of the sanity checking done at this point. * Return this packet we have been waiting for. */ if (save) { save->qtime = ((tq.tv_sec + JAN_1970) << 16) + (tq.tv_usec << 10) / 15625; save->rtime = ((tr.tv_sec + JAN_1970) << 16) + (tr.tv_usec << 10) / 15625; save->len = len; bcopy((char *)igmp, (char *)&save->igmp, ipdatalen); } return (recvlen); } } return (0); } /* * Most of this code is duplicated elsewhere. I'm not sure if * the duplication is absolutely required or not. * * Ideally, this would keep track of ongoing statistics * collection and print out statistics. (& keep track * of h-b-h traces and only print the longest) For now, * it just snoops on what traces it can. */ void passive_mode(void) { struct timeval tr; struct ip *ip; struct igmp *igmp; struct tr_resp *r; int ipdatalen, iphdrlen, igmpdatalen; int len, recvlen; socklen_t dummy; u_int32_t smask; if (raddr) { if (IN_MULTICAST(ntohl(raddr))) k_join(raddr, INADDR_ANY); } else k_join(htonl(0xE0000120), INADDR_ANY); while (1) { recvlen = recvfrom(igmp_socket, recv_buf, RECV_BUF_SIZE, 0, (struct sockaddr *)0, &dummy); gettimeofday(&tr,0); if (recvlen <= 0) { if (recvlen && errno != EINTR) perror("recvfrom"); continue; } if (recvlen < (int)sizeof(struct ip)) { fprintf(stderr, "packet too short (%u bytes) for IP header", recvlen); continue; } ip = (struct ip *) recv_buf; if (ip->ip_p == 0) /* ignore cache creation requests */ continue; iphdrlen = ip->ip_hl << 2; ipdatalen = ip->ip_len; if (iphdrlen + ipdatalen != recvlen) { fprintf(stderr, "packet shorter (%u bytes) than hdr+data len (%u+%u)\n", recvlen, iphdrlen, ipdatalen); continue; } igmp = (struct igmp *) (recv_buf + iphdrlen); igmpdatalen = ipdatalen - IGMP_MINLEN; if (igmpdatalen < 0) { fprintf(stderr, "IP data field too short (%u bytes) for IGMP from %s\n", ipdatalen, inet_fmt(ip->ip_src.s_addr)); continue; } switch (igmp->igmp_type) { case IGMP_MTRACE_QUERY: /* For backward compatibility with 3.3 */ case IGMP_MTRACE_REPLY: if (igmpdatalen < (int)QLEN) continue; if ((igmpdatalen - QLEN)%RLEN) { printf("packet with incorrect datalen\n"); continue; } len = (igmpdatalen - QLEN)/RLEN; break; default: continue; } base.qtime = ((tr.tv_sec + JAN_1970) << 16) + (tr.tv_usec << 10) / 15625; base.rtime = ((tr.tv_sec + JAN_1970) << 16) + (tr.tv_usec << 10) / 15625; base.len = len; bcopy((char *)igmp, (char *)&base.igmp, ipdatalen); /* * If the user specified which traces to monitor, * only accept traces that correspond to the * request */ if ((qsrc != 0 && qsrc != base.qhdr.tr_src) || (qdst != 0 && qdst != base.qhdr.tr_dst) || (qgrp != 0 && qgrp != igmp->igmp_group.s_addr)) continue; printf("Mtrace from %s to %s via group %s (mxhop=%d)\n", inet_fmt(base.qhdr.tr_dst), inet_fmt(base.qhdr.tr_src), inet_fmt(igmp->igmp_group.s_addr), igmp->igmp_code); if (len == 0) continue; printf(" 0 "); print_host(base.qhdr.tr_dst); printf("\n"); print_trace(1, &base); r = base.resps + base.len - 1; VAL_TO_MASK(smask, r->tr_smask); if ((r->tr_inaddr & smask) == (base.qhdr.tr_src & smask)) { printf("%3d ", -(base.len+1)); print_host(base.qhdr.tr_src); printf("\n"); } else if (r->tr_rmtaddr != 0) { printf("%3d ", -(base.len+1)); what_kind(&base, r->tr_rflags == TR_OLD_ROUTER ? "doesn't support mtrace" : "is the next hop"); } printf("\n"); } } const char * print_host(u_int32_t addr) { return print_host2(addr, 0); } /* * On some routers, one interface has a name and the other doesn't. * We always print the address of the outgoing interface, but can * sometimes get the name from the incoming interface. This might be * confusing but should be slightly more helpful than just a "?". */ const char * print_host2(u_int32_t addr1, u_int32_t addr2) { const char *name; if (numeric) { printf("%s", inet_fmt(addr1)); return (""); } name = inet_name(addr1); if (*name == '?' && *(name + 1) == '\0' && addr2 != 0) name = inet_name(addr2); printf("%s (%s)", name, inet_fmt(addr1)); return (name); } /* * Print responses as received (reverse path from dst to src) */ void print_trace(int idx, struct resp_buf *buf) { struct tr_resp *r; const char *name; int i; int hop; const char *ms, *ft; i = abs(idx); r = buf->resps + i - 1; for (; i <= buf->len; ++i, ++r) { if (idx > 0) printf("%3d ", -i); name = print_host2(r->tr_outaddr, r->tr_inaddr); printf(" %s thresh^ %d", proto_type(r->tr_rproto), r->tr_fttl); if (verbose) { hop = t_diff(fixtime(ntohl(r->tr_qarr)), buf->qtime); ms = scale(&hop); printf(" %d%s", hop, ms); } ft = flag_type(r->tr_rflags); if (strlen(ft) != 0) printf(" %s", ft); printf("\n"); memcpy(names[i-1], name, sizeof(names[0]) - 1); names[i-1][sizeof(names[0])-1] = '\0'; } } /* * See what kind of router is the next hop */ int what_kind(struct resp_buf *buf, const char *why) { u_int32_t smask; int retval; int hops = buf->len; struct tr_resp *r = buf->resps + hops - 1; u_int32_t next = r->tr_rmtaddr; retval = send_recv(next, IGMP_DVMRP, DVMRP_ASK_NEIGHBORS2, 1, &incr[0]); print_host(next); if (retval) { u_int32_t version = ntohl(incr[0].igmp.igmp_group.s_addr); u_int32_t *p = (u_int32_t *)incr[0].ndata; u_int32_t *ep = p + (incr[0].len >> 2); const char *type = ""; retval = 0; switch (version & 0xFF) { case 1: type = "proteon/mrouted "; retval = 1; break; case 2: case 3: if (((version >> 8) & 0xFF) < 3) retval = 1; /* Fall through */ case 4: type = "mrouted "; break; case 10: type = "cisco "; } printf(" [%s%d.%d] %s\n", type, version & 0xFF, (version >> 8) & 0xFF, why); VAL_TO_MASK(smask, r->tr_smask); while (p < ep) { u_int32_t laddr = *p++; int flags = (ntohl(*p) & 0xFF00) >> 8; int n = ntohl(*p++) & 0xFF; if (!(flags & (DVMRP_NF_DOWN | DVMRP_NF_DISABLED)) && (laddr & smask) == (qsrc & smask)) { printf("%3d ", -(hops+2)); print_host(qsrc); printf("\n"); return 1; } p += n; } return retval; } printf(" %s\n", why); return 0; } const char * scale(int *hop) { if (*hop > -1000 && *hop < 10000) return (" ms"); *hop /= 1000; if (*hop > -1000 && *hop < 10000) return (" s "); return ("s "); } /* * Calculate and print one line of packet loss and packet rate statistics. * Checks for count of all ones from mrouted 2.3 that doesn't have counters. */ #define NEITHER 0 #define INS 1 #define OUTS 2 #define BOTH 3 void stat_line(struct tr_resp *r, struct tr_resp *s, int have_next, int *rst) { int timediff = (fixtime(ntohl(s->tr_qarr)) - fixtime(ntohl(r->tr_qarr))) >> 16; int v_lost, v_pct; int g_lost, g_pct; int v_out = ntohl(s->tr_vifout) - ntohl(r->tr_vifout); int g_out = ntohl(s->tr_pktcnt) - ntohl(r->tr_pktcnt); int v_pps, g_pps; char v_str[8], g_str[8]; int have = NEITHER; int res = *rst; if (timediff == 0) timediff = 1; v_pps = v_out / timediff; g_pps = g_out / timediff; if ((v_out && (s->tr_vifout != 0xFFFFFFFF && s->tr_vifout != 0)) || (r->tr_vifout != 0xFFFFFFFF && r->tr_vifout != 0)) have |= OUTS; if (have_next) { --r, --s, --rst; if ((s->tr_vifin != 0xFFFFFFFF && s->tr_vifin != 0) || (r->tr_vifin != 0xFFFFFFFF && r->tr_vifin != 0)) have |= INS; if (*rst) res = 1; } switch (have) { case BOTH: v_lost = v_out - (ntohl(s->tr_vifin) - ntohl(r->tr_vifin)); if (v_out) v_pct = (v_lost * 100 + (v_out >> 1)) / v_out; else v_pct = 0; if (-100 < v_pct && v_pct < 101 && v_out > 10) (void)snprintf(v_str, sizeof v_str, "%3d", v_pct); else memcpy(v_str, " --", 4); g_lost = g_out - (ntohl(s->tr_pktcnt) - ntohl(r->tr_pktcnt)); if (g_out) g_pct = (g_lost * 100 + (g_out >> 1))/ g_out; else g_pct = 0; if (-100 < g_pct && g_pct < 101 && g_out > 10) (void)snprintf(g_str, sizeof g_str, "%3d", g_pct); else memcpy(g_str, " --", 4); printf("%6d/%-5d=%s%%%4d pps", v_lost, v_out, v_str, v_pps); if (res) printf("\n"); else printf("%6d/%-5d=%s%%%4d pps\n", g_lost, g_out, g_str, g_pps); break; case INS: v_out = ntohl(s->tr_vifin) - ntohl(r->tr_vifin); v_pps = v_out / timediff; /* Fall through */ case OUTS: printf(" %-5d %4d pps", v_out, v_pps); if (res) printf("\n"); else printf(" %-5d %4d pps\n", g_out, g_pps); break; case NEITHER: printf("\n"); break; } if (debug > 2) { printf("\t\t\t\tv_in: %ld ", (long)ntohl(s->tr_vifin)); printf("v_out: %ld ", (long)ntohl(s->tr_vifout)); printf("pkts: %ld\n", (long)ntohl(s->tr_pktcnt)); printf("\t\t\t\tv_in: %ld ", (long)ntohl(r->tr_vifin)); printf("v_out: %ld ", (long)ntohl(r->tr_vifout)); printf("pkts: %ld\n", (long)ntohl(r->tr_pktcnt)); printf("\t\t\t\tv_in: %ld ", (long)ntohl(s->tr_vifin)-ntohl(r->tr_vifin)); printf("v_out: %ld ", (long)(ntohl(s->tr_vifout) - ntohl(r->tr_vifout))); printf("pkts: %ld ", (long)(ntohl(s->tr_pktcnt) - ntohl(r->tr_pktcnt))); printf("time: %d\n", timediff); printf("\t\t\t\tres: %d\n", res); } } /* * A fixup to check if any pktcnt has been reset, and to fix the * byteorder bugs in mrouted 3.6 on little-endian machines. */ void fixup_stats(struct resp_buf *basep, struct resp_buf *prev, struct resp_buf *new) { int rno = basep->len; struct tr_resp *b = basep->resps + rno; struct tr_resp *p = prev->resps + rno; struct tr_resp *n = new->resps + rno; int *r = reset + rno; int *s = swaps + rno; int res; /* Check for byte-swappers */ while (--rno >= 0) { --n; --p; --b; --s; if (*s || (ntohl(n->tr_vifout) - ntohl(p->tr_vifout)) > 100000) { /* This host sends byteswapped reports; swap 'em */ if (!*s) { *s = 1; b->tr_qarr = byteswap(b->tr_qarr); b->tr_vifin = byteswap(b->tr_vifin); b->tr_vifout = byteswap(b->tr_vifout); b->tr_pktcnt = byteswap(b->tr_pktcnt); } n->tr_qarr = byteswap(n->tr_qarr); n->tr_vifin = byteswap(n->tr_vifin); n->tr_vifout = byteswap(n->tr_vifout); n->tr_pktcnt = byteswap(n->tr_pktcnt); } } rno = basep->len; b = basep->resps + rno; p = prev->resps + rno; n = new->resps + rno; while (--rno >= 0) { --n; --p; --b; --r; res = ((ntohl(n->tr_pktcnt) < ntohl(b->tr_pktcnt)) || (ntohl(n->tr_pktcnt) < ntohl(p->tr_pktcnt))); if (debug > 2) printf("\t\tr=%d, res=%d\n", *r, res); if (*r) { if (res || *r > 1) { /* * This router appears to be a 3.4 with that nasty ol' * neighbor version bug, which causes it to constantly * reset. Just nuke the statistics for this node, and * don't even bother giving it the benefit of the * doubt from now on. */ p->tr_pktcnt = b->tr_pktcnt = n->tr_pktcnt; r++; } else { /* * This is simply the situation that the original * fixup_stats was meant to deal with -- that a * 3.3 or 3.4 router deleted a cache entry while * traffic was still active. */ *r = 0; break; } } else *r = res; } if (rno < 0) return; rno = basep->len; b = basep->resps + rno; p = prev->resps + rno; while (--rno >= 0) (--b)->tr_pktcnt = (--p)->tr_pktcnt; } /* * Print responses with statistics for forward path (from src to dst) */ int print_stats(struct resp_buf *basep, struct resp_buf *prev, struct resp_buf *new) { int rtt, hop; const char *ms; char *s1; u_int32_t smask; int rno = basep->len - 1; struct tr_resp *b = basep->resps + rno; struct tr_resp *p = prev->resps + rno; struct tr_resp *n = new->resps + rno; int *r = reset + rno; u_long resptime = new->rtime; u_long qarrtime = fixtime(ntohl(n->tr_qarr)); u_int ttl = n->tr_fttl; int first = (basep == prev); VAL_TO_MASK(smask, b->tr_smask); printf(" Source Response Dest"); printf(" Packet Statistics For Only For Traffic\n"); s1 = inet_fmt(qsrc); printf("%-15s %-15s All Multicast Traffic From %s\n", ((b->tr_inaddr & smask) == (qsrc & smask)) ? s1 : " * * * ", inet_fmt(basep->qhdr.tr_raddr), s1); rtt = t_diff(resptime, new->qtime); ms = scale(&rtt); printf(" %c __/ rtt%5d%s Lost/Sent = Pct Rate To %s\n", first ? 'v' : '|', rtt, ms, inet_fmt(qgrp)); if (!first) { hop = t_diff(resptime, qarrtime); ms = scale(&hop); printf(" v / hop%5d%s", hop, ms); printf(" --------------------- --------------------\n"); } if (debug > 2) { printf("\t\t\t\tv_in: %ld ", (long)ntohl(n->tr_vifin)); printf("v_out: %ld ", (long)ntohl(n->tr_vifout)); printf("pkts: %ld\n", (long)ntohl(n->tr_pktcnt)); printf("\t\t\t\tv_in: %ld ", (long)ntohl(b->tr_vifin)); printf("v_out: %ld ", (long)ntohl(b->tr_vifout)); printf("pkts: %ld\n", (long)ntohl(b->tr_pktcnt)); printf("\t\t\t\tv_in: %ld ", (long)(ntohl(n->tr_vifin) - ntohl(b->tr_vifin))); printf("v_out: %ld ", (long)(ntohl(n->tr_vifout) - ntohl(b->tr_vifout))); printf("pkts: %ld\n", (long)(ntohl(n->tr_pktcnt) - ntohl(b->tr_pktcnt))); printf("\t\t\t\treset: %d\n", *r); } while (TRUE) { if ((n->tr_inaddr != b->tr_inaddr) || (p->tr_inaddr != b->tr_inaddr)) return 1; /* Route changed */ if ((n->tr_inaddr != n->tr_outaddr)) printf("%-15s\n", inet_fmt(n->tr_inaddr)); printf("%-15s %-14s %s\n", inet_fmt(n->tr_outaddr), names[rno], flag_type(n->tr_rflags)); if (rno-- < 1) break; printf(" %c ^ ttl%5d ", first ? 'v' : '|', ttl); stat_line(p, n, TRUE, r); if (!first) { resptime = qarrtime; qarrtime = fixtime(ntohl((n-1)->tr_qarr)); hop = t_diff(resptime, qarrtime); ms = scale(&hop); printf(" v | hop%5d%s", hop, ms); stat_line(b, n, TRUE, r); } --b, --p, --n, --r; if (ttl < n->tr_fttl) ttl = n->tr_fttl; else ++ttl; } printf(" %c \\__ ttl%5d ", first ? 'v' : '|', ttl); stat_line(p, n, FALSE, r); if (!first) { hop = t_diff(qarrtime, new->qtime); ms = scale(&hop); printf(" v \\ hop%5d%s", hop, ms); stat_line(b, n, FALSE, r); } printf("%-15s %s\n", inet_fmt(qdst), inet_fmt(lcl_addr)); printf(" Receiver Query Source\n\n"); return 0; } /*************************************************************************** * main ***************************************************************************/ int main(int argc, char **argv) { int udp; struct sockaddr_in addr; socklen_t addrlen = sizeof(addr); int recvlen; struct timeval tv; struct resp_buf *prev, *new; struct tr_resp *r; u_int32_t smask; int rno; int hops, nexthop, tries; u_int32_t lastout = 0; int numstats = 1; int waittime; if (geteuid() != 0) { fprintf(stderr, "mtrace: must be root\n"); exit(1); } init_igmp(); if (setuid(getuid()) == -1) logit(LOG_ERR, errno, "setuid"); argv++, argc--; if (argc == 0) goto usage; while (argc > 0 && *argv[0] == '-') { const char *p = *argv++; argc--; p++; do { char c = *p++; const char *arg = (char *) 0; if (isdigit((unsigned char)*p)) { arg = p; p = ""; } else if (argc > 0) arg = argv[0]; switch (c) { case 'd': /* Unlisted debug print option */ if (arg && isdigit((unsigned char)*arg)) { debug = atoi(arg); if (debug < 0) debug = 0; if (debug > 3) debug = 3; if (arg == argv[0]) argv++, argc--; break; } else goto usage; case 'M': /* Use multicast for reponse */ multicast = TRUE; break; case 'l': /* Loop updating stats indefinitely */ numstats = 3153600; break; case 'n': /* Don't reverse map host addresses */ numeric = TRUE; break; case 'p': /* Passive listen for traces */ passive = TRUE; break; case 'v': /* Verbosity */ verbose = TRUE; break; case 's': /* Short form, don't wait for stats */ numstats = 0; break; case 'w': /* Time to wait for packet arrival */ if (arg && isdigit((unsigned char)*arg)) { timeout = atoi(arg); if (timeout < 1) timeout = 1; if (arg == argv[0]) argv++, argc--; break; } else goto usage; case 'm': /* Max number of hops to trace */ if (arg && isdigit((unsigned char)*arg)) { qno = atoi(arg); if (qno > MAXHOPS) qno = MAXHOPS; else if (qno < 1) qno = 0; if (arg == argv[0]) argv++, argc--; break; } else goto usage; case 'q': /* Number of query retries */ if (arg && isdigit((unsigned char)*arg)) { nqueries = atoi(arg); if (nqueries < 1) nqueries = 1; if (arg == argv[0]) argv++, argc--; break; } else goto usage; case 'g': /* Last-hop gateway (dest of query) */ if (arg && (gwy = host_addr(arg))) { if (arg == argv[0]) argv++, argc--; break; } else goto usage; case 't': /* TTL for query packet */ if (arg && isdigit((unsigned char)*arg)) { qttl = atoi(arg); if (qttl < 1) qttl = 1; rttl = qttl; if (arg == argv[0]) argv++, argc--; break; } else goto usage; case 'r': /* Dest for response packet */ if (arg && (raddr = host_addr(arg))) { if (arg == argv[0]) argv++, argc--; break; } else goto usage; case 'i': /* Local interface address */ if (arg && (lcl_addr = host_addr(arg))) { if (arg == argv[0]) argv++, argc--; break; } else goto usage; case 'S': /* Stat accumulation interval */ if (arg && isdigit((unsigned char)*arg)) { statint = atoi(arg); if (statint < 1) statint = 1; if (arg == argv[0]) argv++, argc--; break; } else goto usage; default: goto usage; } } while (*p); } if (argc > 0 && (qsrc = host_addr(argv[0]))) { /* Source of path */ if (IN_MULTICAST(ntohl(qsrc))) goto usage; argv++, argc--; if (argc > 0 && (qdst = host_addr(argv[0]))) { /* Dest of path */ argv++, argc--; if (argc > 0 && (qgrp = host_addr(argv[0]))) { /* Path via group */ argv++, argc--; } if (IN_MULTICAST(ntohl(qdst))) { u_int32_t temp = qdst; qdst = qgrp; qgrp = temp; if (IN_MULTICAST(ntohl(qdst))) goto usage; } else if (qgrp && !IN_MULTICAST(ntohl(qgrp))) goto usage; } } if (passive) { passive_mode(); return(0); } if (argc > 0 || qsrc == 0) { usage: printf("\ Usage: mtrace [-Mlnps] [-w wait] [-m max_hops] [-q nqueries] [-g gateway]\n\ [-S statint] [-t ttl] [-r resp_dest] [-i if_addr] source [receiver] [group]\n"); exit(1); } /* * Set useful defaults for as many parameters as possible. */ defgrp = htonl(0xE0020001); /* MBone Audio (224.2.0.1) */ query_cast = htonl(0xE0000002); /* All routers multicast addr */ resp_cast = htonl(0xE0000120); /* Mtrace response multicast addr */ if (qgrp == 0) qgrp = defgrp; /* * Get default local address for multicasts to use in setting defaults. */ memset(&addr, 0, sizeof(addr)); addr.sin_family = AF_INET; #if (defined(BSD) && (BSD >= 199103)) addr.sin_len = sizeof(addr); #endif addr.sin_addr.s_addr = qgrp; addr.sin_port = htons(2000); /* Any port above 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); } #ifdef SUNOS5 /* * SunOS 5.X prior to SunOS 2.6, getsockname returns 0 for udp socket. * This call to sysinfo will return the hostname. * If the default multicast interfface (set with the route * for 224.0.0.0) is not the same as the hostname, * mtrace -i [if_addr] will have to be used. */ if (addr.sin_addr.s_addr == 0) { char myhostname[MAXHOSTNAMELEN]; struct hostent *hp; int error; error = sysinfo(SI_HOSTNAME, myhostname, sizeof(myhostname)); if (error == -1) { perror("Getting my hostname"); exit(1); } hp = gethostbyname(myhostname); if (hp == NULL || hp->h_addrtype != AF_INET || hp->h_length != sizeof(addr.sin_addr)) { perror("Finding IP address for my hostname"); exit(1); } memcpy((char *)&addr.sin_addr.s_addr, hp->h_addr, sizeof(addr.sin_addr.s_addr)); } #endif /* * Default destination for path to be queried is the local host. */ if (qdst == 0) qdst = lcl_addr ? lcl_addr : addr.sin_addr.s_addr; dst_netmask = get_netmask(udp, qdst); close(udp); if (lcl_addr == 0) lcl_addr = addr.sin_addr.s_addr; /* * Protect against unicast queries to mrouted versions that might crash. */ if (gwy && !IN_MULTICAST(ntohl(gwy))) if (send_recv(gwy, IGMP_DVMRP, DVMRP_ASK_NEIGHBORS2, 1, &incr[0])) { int version = ntohl(incr[0].igmp.igmp_group.s_addr) & 0xFFFF; if (version == 0x0303 || version == 0x0503) { printf("Don't use -g to address an mrouted 3.%d, it might crash\n", (version >> 8) & 0xFF); exit(0); } } printf("Mtrace from %s to %s via group %s\n", inet_fmt(qsrc), inet_fmt(qdst), inet_fmt(qgrp)); if ((qdst & dst_netmask) == (qsrc & dst_netmask)) { printf("Source & receiver are directly connected, no path to trace\n"); exit(0); } /* * If the response is to be a multicast address, make sure we * are listening on that multicast address. */ if (raddr) { if (IN_MULTICAST(ntohl(raddr))) k_join(raddr, lcl_addr); } else k_join(resp_cast, lcl_addr); /* * If the destination is on the local net, the last-hop router can * be found by multicast to the all-routers multicast group. * Otherwise, use the group address that is the subject of the * query since by definition the last-hop router will be a member. * Set default TTLs for local remote multicasts. */ restart: if (gwy == 0) if ((qdst & dst_netmask) == (lcl_addr & dst_netmask)) tdst = query_cast; else tdst = qgrp; else tdst = gwy; if (IN_MULTICAST(ntohl(tdst))) { k_set_loop(1); /* If I am running on a router, I need to hear this */ if (tdst == query_cast) k_set_ttl(qttl ? qttl : 1); else k_set_ttl(qttl ? qttl : MULTICAST_TTL1); } /* * Try a query at the requested number of hops or MAXHOPS if unspecified. */ if (qno == 0) { hops = MAXHOPS; tries = 1; printf("Querying full reverse path... "); fflush(stdout); } else { hops = qno; tries = nqueries; printf("Querying reverse path, maximum %d hops... ", qno); fflush(stdout); } base.rtime = 0; base.len = 0; recvlen = send_recv(tdst, IGMP_MTRACE_QUERY, hops, tries, &base); /* * If the initial query was successful, print it. Otherwise, if * the query max hop count is the default of zero, loop starting * from one until there is no response for four hops. The extra * hops allow getting past an mtrace-capable mrouter that can't * send multicast packets because all phyints are disabled. */ if (recvlen) { printf("\n 0 "); print_host(qdst); printf("\n"); print_trace(1, &base); r = base.resps + base.len - 1; if (r->tr_rflags == TR_OLD_ROUTER || r->tr_rflags == TR_NO_SPACE || qno != 0) { printf("%3d ", -(base.len+1)); what_kind(&base, r->tr_rflags == TR_OLD_ROUTER ? "doesn't support mtrace" : "is the next hop"); } else { VAL_TO_MASK(smask, r->tr_smask); if ((r->tr_inaddr & smask) == (qsrc & smask)) { printf("%3d ", -(base.len+1)); print_host(qsrc); printf("\n"); } } } else if (qno == 0) { printf("switching to hop-by-hop:\n 0 "); print_host(qdst); printf("\n"); for (hops = 1, nexthop = 1; hops <= MAXHOPS; ++hops) { printf("%3d ", -hops); fflush(stdout); /* * After a successful first hop, try switching to the unicast * address of the last-hop router instead of multicasting the * trace query. This should be safe for mrouted versions 3.3 * and 3.5 because there is a long route timeout with metric * infinity before a route disappears. Switching to unicast * reduces the amount of multicast traffic and avoids a bug * with duplicate suppression in mrouted 3.5. */ if (hops == 2 && gwy == 0 && (recvlen = send_recv(lastout, IGMP_MTRACE_QUERY, hops, 1, &base))) tdst = lastout; else recvlen = send_recv(tdst, IGMP_MTRACE_QUERY, hops, nqueries, &base); if (recvlen == 0) { if (hops == 1) break; if (hops == nexthop) { if (what_kind(&base, "didn't respond")) { /* the ask_neighbors determined that the * not-responding router is the first-hop. */ break; } } else if (hops < nexthop + 3) { printf("\n"); } else { printf("...giving up\n"); break; } continue; } r = base.resps + base.len - 1; if (base.len == hops && (hops == 1 || (base.resps+nexthop-2)->tr_outaddr == lastout)) { if (hops == nexthop) { print_trace(-hops, &base); } else { printf("\nResuming...\n"); print_trace(nexthop, &base); } } else { if (base.len < hops) { /* * A shorter trace than requested means a fatal error * occurred along the path, or that the route changed * to a shorter one. * * If the trace is longer than the last one we received, * then we are resuming from a skipped router (but there * is still probably a problem). * * If the trace is shorter than the last one we * received, then the route must have changed (and * there is still probably a problem). */ if (nexthop <= base.len) { printf("\nResuming...\n"); print_trace(nexthop, &base); } else if (nexthop > base.len + 1) { hops = base.len; printf("\nRoute must have changed...\n"); print_trace(1, &base); } } else { /* * The last hop address is not the same as it was; * the route probably changed underneath us. */ hops = base.len; printf("\nRoute must have changed...\n"); print_trace(1, &base); } } lastout = r->tr_outaddr; if (base.len < hops || r->tr_rmtaddr == 0 || (r->tr_rflags & 0x80)) { VAL_TO_MASK(smask, r->tr_smask); if (r->tr_rmtaddr) { if (hops != nexthop) { printf("\n%3d ", -(base.len+1)); } what_kind(&base, r->tr_rflags == TR_OLD_ROUTER ? "doesn't support mtrace" : "would be the next hop"); /* XXX could do segmented trace if TR_NO_SPACE */ } else if (r->tr_rflags == TR_NO_ERR && (r->tr_inaddr & smask) == (qsrc & smask)) { printf("%3d ", -(hops + 1)); print_host(qsrc); printf("\n"); } break; } nexthop = hops + 1; } } if (base.rtime == 0) { printf("Timed out receiving responses\n"); if (IN_MULTICAST(ntohl(tdst))) { if (tdst == query_cast) printf("Perhaps no local router has a route for source %s\n", inet_fmt(qsrc)); else printf("Perhaps receiver %s is not a member of group %s,\n" "or no router local to it has a route for source %s,\n" "or multicast at ttl %d doesn't reach its last-hop router" " for that source\n", inet_fmt(qdst), inet_fmt(qgrp), inet_fmt(qsrc), qttl ? qttl : MULTICAST_TTL1); } exit(1); } printf("Round trip time %d ms\n\n", t_diff(base.rtime, base.qtime)); /* * Use the saved response which was the longest one received, * and make additional probes after delay to measure loss. */ raddr = base.qhdr.tr_raddr; rttl = base.qhdr.tr_rttl; gettimeofday(&tv, 0); waittime = statint - (((tv.tv_sec + JAN_1970) & 0xFFFF) - (base.qtime >> 16)); prev = &base; new = &incr[numstats&1]; while (numstats--) { if (waittime < 1) printf("\n"); else { printf("Waiting to accumulate statistics... "); fflush(stdout); sleep((unsigned)waittime); } rno = base.len; recvlen = send_recv(tdst, IGMP_MTRACE_QUERY, rno, nqueries, new); if (recvlen == 0) { printf("Timed out.\n"); exit(1); } if (rno != new->len) { printf("Trace length doesn't match:\n"); /* * XXX Should this trace result be printed, or is that * too verbose? Perhaps it should just say restarting. * But if the path is changing quickly, this may be the * only snapshot of the current path. But, if the path * is changing that quickly, does the current path really * matter? */ print_trace(1, new); printf("Restarting.\n\n"); numstats++; goto restart; } printf("Results after %d seconds:\n\n", (int)((new->qtime - base.qtime) >> 16)); fixup_stats(&base, prev, new); if (print_stats(&base, prev, new)) { printf("Route changed:\n"); print_trace(1, new); printf("Restarting.\n\n"); goto restart; } prev = new; new = &incr[numstats&1]; waittime = statint; } /* * If the response was multicast back, leave the group */ if (raddr) { if (IN_MULTICAST(ntohl(raddr))) k_leave(raddr, lcl_addr); } else k_leave(resp_cast, lcl_addr); return (0); } void check_vif_state(void) { logit(LOG_WARNING, errno, "sendto"); } /* * 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. */ void logit(int severity, int syserr, const char *format, ...) { va_list ap; switch (debug) { case 0: if (severity > LOG_WARNING) return; case 1: if (severity > LOG_NOTICE) return; case 2: if (severity > LOG_INFO ) return; default: if (severity == LOG_WARNING) fprintf(stderr, "warning - "); va_start(ap, format); vfprintf(stderr, format, ap); va_end(ap); if (syserr == 0) fprintf(stderr, "\n"); else fprintf(stderr, ": %s\n", strerror(syserr)); } if (severity <= LOG_ERR) exit(1); } /* dummies */ void accept_probe(u_int32_t src, u_int32_t dst, char *p, int datalen, u_int32_t level) { } void accept_group_report(u_int32_t src, u_int32_t dst, u_int32_t group, int r_type) { } void accept_neighbor_request2(u_int32_t src, u_int32_t dst) { } void accept_report(u_int32_t src, u_int32_t dst, char *p, int datalen, u_int32_t level) { } void accept_neighbor_request(u_int32_t src, u_int32_t dst) { } void accept_prune(u_int32_t src, u_int32_t dst, char *p, int datalen) { } void accept_graft(u_int32_t src, u_int32_t dst, char *p, int datalen) { } void accept_g_ack(u_int32_t src, u_int32_t dst, char *p, int datalen) { } void add_table_entry(u_int32_t origin, u_int32_t mcastgrp) { } void accept_leave_message(u_int32_t src, u_int32_t dst, u_int32_t group) { } void accept_mtrace(u_int32_t src, u_int32_t dst, u_int32_t group, char *data, u_int no, int datalen) { } void accept_membership_query(u_int32_t src, u_int32_t dst, u_int32_t group, int tmo) { } void accept_neighbors(u_int32_t src, u_int32_t dst, u_char *p, int datalen, u_int32_t level) { } void accept_neighbors2(u_int32_t src, u_int32_t dst, u_char *p, int datalen, u_int32_t level) { } void accept_info_request(u_int32_t src, u_int32_t dst, u_char *p, int datalen) { } void accept_info_reply(u_int32_t src, u_int32_t dst, u_char *p, int datalen) { }