The Tcpdump Group git mirrors - tcpdump/blob - print-igmp.c

   1 /*
   2  * Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994, 1995, 1996
   3  *  The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that: (1) source code distributions
   7  * retain the above copyright notice and this paragraph in its entirety, (2)
   8  * distributions including binary code include the above copyright notice and
   9  * this paragraph in its entirety in the documentation or other materials
  10  * provided with the distribution, and (3) all advertising materials mentioning
  11  * features or use of this software display the following acknowledgement:
  12  * ``This product includes software developed by the University of California,
  13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  14  * the University nor the names of its contributors may be used to endorse
  15  * or promote products derived from this software without specific prior
  16  * written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  */
  21
  22 #ifndef lint
  23 static const char rcsid[] =
  24     "@(#) $Header: /tcpdump/master/tcpdump/print-igmp.c,v 1.2 2000-11-02 18:02:52 fenner Exp $ (LBL)";
  25 #endif
  26
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #include <sys/param.h>
  32 #include <sys/socket.h>
  33
  34 #include <netinet/in.h>
  35 #include <netinet/in_systm.h>
  36 #include <netinet/ip.h>
  37
  38 #include <stdio.h>
  39 #include <string.h>
  40
  41 #include "interface.h"
  42 #include "addrtoname.h"
  43 #include "extract.h"            /* must come after interface.h */
  44
  45 #ifndef IN_CLASSD
  46 #define IN_CLASSD(i) (((int32_t)(i) & 0xf0000000) == 0xe0000000)
  47 #endif
  48
  49 /* (following from ipmulti/mrouted/prune.h) */
  50
  51 /*
  52  * The packet format for a traceroute request.
  53  */
  54 struct tr_query {
  55     u_int  tr_src;          /* traceroute source */
  56     u_int  tr_dst;          /* traceroute destination */
  57     u_int  tr_raddr;        /* traceroute response address */
  58     u_int  tr_rttlqid;      /* response ttl and qid */
  59 };
  60
  61 #define TR_GETTTL(x)        (int)(((x) >> 24) & 0xff)
  62 #define TR_GETQID(x)        ((x) & 0x00ffffff)
  63
  64 /*
  65  * Traceroute response format.  A traceroute response has a tr_query at the
  66  * beginning, followed by one tr_resp for each hop taken.
  67  */
  68 struct tr_resp {
  69     u_int tr_qarr;          /* query arrival time */
  70     u_int tr_inaddr;        /* incoming interface address */
  71     u_int tr_outaddr;       /* outgoing interface address */
  72     u_int tr_rmtaddr;       /* parent address in source tree */
  73     u_int tr_vifin;         /* input packet count on interface */
  74     u_int tr_vifout;        /* output packet count on interface */
  75     u_int tr_pktcnt;        /* total incoming packets for src-grp */
  76     u_char  tr_rproto;      /* routing proto deployed on router */
  77     u_char  tr_fttl;        /* ttl required to forward on outvif */
  78     u_char  tr_smask;       /* subnet mask for src addr */
  79     u_char  tr_rflags;      /* forwarding error codes */
  80 };
  81
  82 /* defs within mtrace */
  83 #define TR_QUERY 1
  84 #define TR_RESP 2
  85
  86 /* fields for tr_rflags (forwarding error codes) */
  87 #define TR_NO_ERR   0
  88 #define TR_WRONG_IF 1
  89 #define TR_PRUNED   2
  90 #define TR_OPRUNED  3
  91 #define TR_SCOPED   4
  92 #define TR_NO_RTE   5
  93 #define TR_NO_FWD   7
  94 #define TR_NO_SPACE 0x81
  95 #define TR_OLD_ROUTER   0x82
  96
  97 /* fields for tr_rproto (routing protocol) */
  98 #define TR_PROTO_DVMRP  1
  99 #define TR_PROTO_MOSPF  2
 100 #define TR_PROTO_PIM    3
 101 #define TR_PROTO_CBT    4
 102
 103 /* igmpv3 report types */
 104 static struct tok igmpv3report2str[] = {
 105         { 1,    "is_in" },
 106         { 2,    "is_ex" },
 107         { 3,    "to_in" },
 108         { 4,    "to_ex" },
 109         { 5,    "allow" },
 110         { 6,    "block" },
 111         { 0,    NULL }
 112 };
 113
 114 static void
 115 print_mtrace(register const u_char *bp, register u_int len)
 116 {
 117     register struct tr_query *tr = (struct tr_query *)(bp + 8);
 118
 119     printf("mtrace %lu: %s to %s reply-to %s",
 120         (u_long)TR_GETQID(ntohl(tr->tr_rttlqid)),
 121         ipaddr_string(&tr->tr_src), ipaddr_string(&tr->tr_dst),
 122         ipaddr_string(&tr->tr_raddr));
 123     if (IN_CLASSD(ntohl(tr->tr_raddr)))
 124         printf(" with-ttl %d", TR_GETTTL(ntohl(tr->tr_rttlqid)));
 125 }
 126
 127 static void
 128 print_mresp(register const u_char *bp, register u_int len)
 129 {
 130     register struct tr_query *tr = (struct tr_query *)(bp + 8);
 131
 132     printf("mresp %lu: %s to %s reply-to %s",
 133         (u_long)TR_GETQID(ntohl(tr->tr_rttlqid)),
 134         ipaddr_string(&tr->tr_src), ipaddr_string(&tr->tr_dst),
 135         ipaddr_string(&tr->tr_raddr));
 136     if (IN_CLASSD(ntohl(tr->tr_raddr)))
 137         printf(" with-ttl %d", TR_GETTTL(ntohl(tr->tr_rttlqid)));
 138 }
 139
 140 static void
 141 print_igmpv3_report(register const u_char *bp, register u_int len,
 142        register const u_char *bp2)
 143 {
 144     int group, nsrcs, ngroups;
 145     register int i, j;
 146
 147     /* Minimum len is 16, and should be a multiple of 4 */
 148     if (len < 16 || len & 0x03) {
 149         (void)printf(" [invalid len %d]", len);
 150         return;
 151     }
 152     TCHECK2(bp[6], 2);
 153     ngroups = EXTRACT_16BITS(&bp[6]);
 154     (void)printf(", %d group record(s)", ngroups);
 155     if (vflag > 0) {
 156         /* Print the group records */
 157         group = 8;
 158         for (i=0; i<ngroups; i++) {
 159             if (len < group+8) {
 160                 (void)printf(" [invalid number of groups]");
 161                 return;
 162             }
 163             TCHECK2(bp[group+4], 4);
 164             (void)printf(" [gaddr %s", ipaddr_string(&bp[group+4]));
 165             (void)printf(" %s", tok2str(igmpv3report2str, " [v3-report-#%d]",
 166                                                                 bp[group]));
 167             nsrcs = EXTRACT_16BITS(&bp[group+2]);
 168             /* Check the number of sources and print them */
 169             if (len < group+8+(nsrcs<<2)) {
 170                 (void)printf(" [invalid number of sources %d]", nsrcs);
 171                 return;
 172             }
 173             if (vflag == 1)
 174                 (void)printf(", %d source(s)", nsrcs);
 175             else {
 176                 /* Print the sources */
 177                 (void)printf(" {");
 178                 for (j=0; j<nsrcs; j++) {
 179                     TCHECK2(bp[group+8+(j<<2)], 4);
 180                     (void)printf(" %s", ipaddr_string(&bp[group+8+(j<<2)]));
 181                 }
 182                 (void)printf(" }");
 183             }
 184             /* Next group record */
 185             group += 8 + (nsrcs << 2);
 186             (void)printf("]");
 187         }
 188     }
 189     return;
 190 trunc:
 191     (void)printf("[|igmp]");
 192     return;
 193 }
 194
 195 static void
 196 print_igmpv3_query(register const u_char *bp, register u_int len,
 197        register const u_char *bp2)
 198 {
 199     int nsrcs;
 200     register int i;
 201
 202     (void)printf(" v3");
 203     /* Minimum len is 12, and should be a multiple of 4 */
 204     if (len < 12 || len & 0x03) {
 205         (void)printf(" [invalid len %d]", len);
 206         return;
 207     }
 208     TCHECK2(bp[4], 4);
 209     if (EXTRACT_32BITS(&bp[4]) == 0)
 210         return;
 211     (void)printf(" [gaddr %s", ipaddr_string(&bp[4]));
 212     TCHECK2(bp[10], 2);
 213     nsrcs = EXTRACT_16BITS(&bp[10]);
 214     if (nsrcs > 0) {
 215         if (len < 12 + (nsrcs << 2))
 216             (void)printf(" [invalid number of sources]");
 217         else if (vflag > 1) {
 218             (void)printf(" {");
 219             for (i=0; i<nsrcs; i++) {
 220                 TCHECK2(bp[12+(i<<2)], 4);
 221                 (void)printf(" %s", ipaddr_string(&bp[12+(i<<2)]));
 222             }
 223             (void)printf(" }");
 224         } else
 225             (void)printf(", %d source(s)", nsrcs);
 226     }
 227     (void)printf("]");
 228     return;
 229 trunc:
 230     (void)printf("[|igmp]");
 231     return;
 232 }
 233
 234 void
 235 igmp_print(register const u_char *bp, register u_int len,
 236        register const u_char *bp2)
 237 {
 238     register const struct ip *ip;
 239
 240     ip = (const struct ip *)bp2;
 241     (void)printf("%s > %s: ",
 242         ipaddr_string(&ip->ip_src),
 243         ipaddr_string(&ip->ip_dst));
 244
 245     if (qflag) {
 246         (void)printf("igmp");
 247         return;
 248     }
 249
 250     TCHECK2(bp[0], 8);
 251     switch (bp[0]) {
 252     case 0x11:
 253         (void)printf("igmp query");
 254         if (len >= 12)
 255             print_igmpv3_query(bp, len, bp2);
 256         else {
 257             if (bp[1]) {
 258                 (void)printf(" v2");
 259                 if (bp[1] != 100)
 260                     (void)printf(" [max resp time %d]", bp[1]);
 261             } else
 262                 (void)printf(" v1");
 263             if (EXTRACT_32BITS(&bp[4]))
 264                 (void)printf(" [gaddr %s]", ipaddr_string(&bp[4]));
 265             if (len != 8)
 266                 (void)printf(" [len %d]", len);
 267         }
 268         break;
 269     case 0x12:
 270         (void)printf("igmp v1 report %s", ipaddr_string(&bp[4]));
 271         if (len != 8)
 272             (void)printf(" [len %d]", len);
 273         break;
 274     case 0x16:
 275         (void)printf("igmp v2 report %s", ipaddr_string(&bp[4]));
 276         break;
 277     case 0x22:
 278         (void)printf("igmp v3 report");
 279         print_igmpv3_report(bp, len, bp2);
 280         break;
 281     case 0x17:
 282         (void)printf("igmp leave %s", ipaddr_string(&bp[4]));
 283         break;
 284     case 0x13:
 285         (void)printf("igmp dvmrp");
 286         if (len < 8)
 287             (void)printf(" [len %d]", len);
 288         else
 289             dvmrp_print(bp, len);
 290         break;
 291     case 0x14:
 292         (void)printf("igmp pimv1");
 293         pimv1_print(bp, len);
 294         break;
 295     case 0x1e:
 296         print_mresp(bp, len);
 297         break;
 298     case 0x1f:
 299         print_mtrace(bp, len);
 300         break;
 301     default:
 302         (void)printf("igmp-%d", bp[0]);
 303         break;
 304     }
 305
 306     if (vflag && TTEST2(bp[0], len)) {
 307         /* Check the IGMP checksum */
 308         if (in_cksum((const u_short*)bp, len, 0))
 309             printf(" bad igmp cksum %x!", EXTRACT_16BITS(&bp[2]));
 310     }
 311     return;
 312 trunc:
 313     fputs("[|igmp]", stdout);
 314 }