The Tcpdump Group git mirrors - tcpdump/blob - print-icmp.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-icmp.c,v 1.38 1999-10-07 23:47:11 mcr Exp $ (LBL)";
  25 #endif
  26
  27 #include <sys/param.h>
  28 #include <sys/time.h>
  29 #include <sys/socket.h>
  30
  31 #if __STDC__
  32 struct mbuf;
  33 struct rtentry;
  34 #endif
  35 #include <net/if.h>
  36
  37 #include <netinet/in.h>
  38 #include <netinet/if_ether.h>
  39 #include <netinet/in_systm.h>
  40 #include <netinet/ip.h>
  41 #include <netinet/ip_icmp.h>
  42 #include <netinet/ip_var.h>
  43 #include <netinet/udp.h>
  44 #include <netinet/udp_var.h>
  45 #include <netinet/tcp.h>
  46 #include <netinet/tcpip.h>
  47
  48 #include <stdio.h>
  49 #include <string.h>
  50
  51 #include "interface.h"
  52 #include "addrtoname.h"
  53 #include "extract.h"                    /* must come after interface.h */
  54
  55 /* rfc1700 */
  56 #ifndef ICMP_UNREACH_NET_UNKNOWN
  57 #define ICMP_UNREACH_NET_UNKNOWN        6       /* destination net unknown */
  58 #endif
  59 #ifndef ICMP_UNREACH_HOST_UNKNOWN
  60 #define ICMP_UNREACH_HOST_UNKNOWN       7       /* destination host unknown */
  61 #endif
  62 #ifndef ICMP_UNREACH_ISOLATED
  63 #define ICMP_UNREACH_ISOLATED           8       /* source host isolated */
  64 #endif
  65 #ifndef ICMP_UNREACH_NET_PROHIB
  66 #define ICMP_UNREACH_NET_PROHIB         9       /* admin prohibited net */
  67 #endif
  68 #ifndef ICMP_UNREACH_HOST_PROHIB
  69 #define ICMP_UNREACH_HOST_PROHIB        10      /* admin prohibited host */
  70 #endif
  71 #ifndef ICMP_UNREACH_TOSNET
  72 #define ICMP_UNREACH_TOSNET             11      /* tos prohibited net */
  73 #endif
  74 #ifndef ICMP_UNREACH_TOSHOST
  75 #define ICMP_UNREACH_TOSHOST            12      /* tos prohibited host */
  76 #endif
  77
  78 /* rfc1716 */
  79 #ifndef ICMP_UNREACH_FILTER_PROHIB
  80 #define ICMP_UNREACH_FILTER_PROHIB      13      /* admin prohibited filter */
  81 #endif
  82 #ifndef ICMP_UNREACH_HOST_PRECEDENCE
  83 #define ICMP_UNREACH_HOST_PRECEDENCE    14      /* host precedence violation */
  84 #endif
  85 #ifndef ICMP_UNREACH_PRECEDENCE_CUTOFF
  86 #define ICMP_UNREACH_PRECEDENCE_CUTOFF  15      /* precedence cutoff */
  87 #endif
  88
  89 /* rfc1256 */
  90 #ifndef ICMP_ROUTERADVERT
  91 #define ICMP_ROUTERADVERT               9       /* router advertisement */
  92 #endif
  93 #ifndef ICMP_ROUTERSOLICIT
  94 #define ICMP_ROUTERSOLICIT              10      /* router solicitation */
  95 #endif
  96
  97 /* Most of the icmp types */
  98 static struct tok icmp2str[] = {
  99         { ICMP_ECHOREPLY,               "echo reply" },
 100         { ICMP_SOURCEQUENCH,            "source quench" },
 101         { ICMP_ECHO,                    "echo request" },
 102         { ICMP_ROUTERSOLICIT,           "router solicitation" },
 103         { ICMP_TSTAMP,                  "time stamp request" },
 104         { ICMP_TSTAMPREPLY,             "time stamp reply" },
 105         { ICMP_IREQ,                    "information request" },
 106         { ICMP_IREQREPLY,               "information reply" },
 107         { ICMP_MASKREQ,                 "address mask request" },
 108         { 0,                            NULL }
 109 };
 110
 111 /* Formats for most of the ICMP_UNREACH codes */
 112 static struct tok unreach2str[] = {
 113         { ICMP_UNREACH_NET,             "net %s unreachable" },
 114         { ICMP_UNREACH_HOST,            "host %s unreachable" },
 115         { ICMP_UNREACH_SRCFAIL,
 116             "%s unreachable - source route failed" },
 117         { ICMP_UNREACH_NET_UNKNOWN,     "net %s unreachable - unknown" },
 118         { ICMP_UNREACH_HOST_UNKNOWN,    "host %s unreachable - unknown" },
 119         { ICMP_UNREACH_ISOLATED,
 120             "%s unreachable - source host isolated" },
 121         { ICMP_UNREACH_NET_PROHIB,
 122             "net %s unreachable - admin prohibited" },
 123         { ICMP_UNREACH_HOST_PROHIB,
 124             "host %s unreachable - admin prohibited" },
 125         { ICMP_UNREACH_TOSNET,
 126             "net %s unreachable - tos prohibited" },
 127         { ICMP_UNREACH_TOSHOST,
 128             "host %s unreachable - tos prohibited" },
 129         { ICMP_UNREACH_FILTER_PROHIB,
 130             "host %s unreachable - admin prohibited filter" },
 131         { ICMP_UNREACH_HOST_PRECEDENCE,
 132             "host %s unreachable - host precedence violation" },
 133         { ICMP_UNREACH_PRECEDENCE_CUTOFF,
 134             "host %s unreachable - precedence cutoff" },
 135         { 0,                            NULL }
 136 };
 137
 138 /* Formats for the ICMP_REDIRECT codes */
 139 static struct tok type2str[] = {
 140         { ICMP_REDIRECT_NET,            "redirect %s to net %s" },
 141         { ICMP_REDIRECT_HOST,           "redirect %s to host %s" },
 142         { ICMP_REDIRECT_TOSNET,         "redirect-tos %s to net %s" },
 143         { ICMP_REDIRECT_TOSHOST,        "redirect-tos %s to net %s" },
 144         { 0,                            NULL }
 145 };
 146
 147 /* rfc1191 */
 148 struct mtu_discovery {
 149         short unused;
 150         short nexthopmtu;
 151 };
 152
 153 /* rfc1256 */
 154 struct ih_rdiscovery {
 155         u_char ird_addrnum;
 156         u_char ird_addrsiz;
 157         u_short ird_lifetime;
 158 };
 159
 160 struct id_rdiscovery {
 161         u_int32_t ird_addr;
 162         u_int32_t ird_pref;
 163 };
 164
 165 void
 166 icmp_print(register const u_char *bp, register const u_char *bp2)
 167 {
 168         register char *cp;
 169         register const struct icmp *dp;
 170         register const struct ip *ip;
 171         register const char *str, *fmt;
 172         register const struct ip *oip;
 173         register const struct udphdr *ouh;
 174         register u_int hlen, dport, mtu;
 175         char buf[256];
 176
 177         dp = (struct icmp *)bp;
 178         ip = (struct ip *)bp2;
 179         str = buf;
 180
 181         (void)printf("%s > %s: ",
 182                 ipaddr_string(&ip->ip_src),
 183                 ipaddr_string(&ip->ip_dst));
 184
 185         TCHECK(dp->icmp_code);
 186         switch (dp->icmp_type) {
 187
 188         case ICMP_UNREACH:
 189                 TCHECK(dp->icmp_ip.ip_dst);
 190                 switch (dp->icmp_code) {
 191
 192                 case ICMP_UNREACH_PROTOCOL:
 193                         TCHECK(dp->icmp_ip.ip_p);
 194                         (void)sprintf(buf, "%s protocol %d unreachable",
 195                                        ipaddr_string(&dp->icmp_ip.ip_dst),
 196                                        dp->icmp_ip.ip_p);
 197                         break;
 198
 199                 case ICMP_UNREACH_PORT:
 200                         TCHECK(dp->icmp_ip.ip_p);
 201                         oip = &dp->icmp_ip;
 202                         hlen = oip->ip_hl * 4;
 203                         ouh = (struct udphdr *)(((u_char *)oip) + hlen);
 204                         dport = ntohs(ouh->uh_dport);
 205                         switch (oip->ip_p) {
 206
 207                         case IPPROTO_TCP:
 208                                 (void)sprintf(buf,
 209                                         "%s tcp port %s unreachable",
 210                                         ipaddr_string(&oip->ip_dst),
 211                                         tcpport_string(dport));
 212                                 break;
 213
 214                         case IPPROTO_UDP:
 215                                 (void)sprintf(buf,
 216                                         "%s udp port %s unreachable",
 217                                         ipaddr_string(&oip->ip_dst),
 218                                         udpport_string(dport));
 219                                 break;
 220
 221                         default:
 222                                 (void)sprintf(buf,
 223                                         "%s protocol %d port %d unreachable",
 224                                         ipaddr_string(&oip->ip_dst),
 225                                         oip->ip_p, dport);
 226                                 break;
 227                         }
 228                         break;
 229
 230                 case ICMP_UNREACH_NEEDFRAG:
 231                         {
 232                         register const struct mtu_discovery *mp;
 233
 234                         mp = (struct mtu_discovery *)&dp->icmp_void;
 235                         mtu = EXTRACT_16BITS(&mp->nexthopmtu);
 236                         if (mtu)
 237                             (void)sprintf(buf,
 238                                 "%s unreachable - need to frag (mtu %d)",
 239                                 ipaddr_string(&dp->icmp_ip.ip_dst), mtu);
 240                         else
 241                             (void)sprintf(buf,
 242                                 "%s unreachable - need to frag",
 243                                 ipaddr_string(&dp->icmp_ip.ip_dst));
 244                         }
 245                         break;
 246
 247                 default:
 248                         fmt = tok2str(unreach2str, "#%d %%s unreachable",
 249                             dp->icmp_code);
 250                         (void)sprintf(buf, fmt,
 251                             ipaddr_string(&dp->icmp_ip.ip_dst));
 252                         break;
 253                 }
 254                 break;
 255
 256         case ICMP_REDIRECT:
 257                 TCHECK(dp->icmp_ip.ip_dst);
 258                 fmt = tok2str(type2str, "redirect-#%d %%s to net %%s",
 259                     dp->icmp_code);
 260                 (void)sprintf(buf, fmt,
 261                     ipaddr_string(&dp->icmp_ip.ip_dst),
 262                     ipaddr_string(&dp->icmp_gwaddr));
 263                 break;
 264
 265         case ICMP_ROUTERADVERT:
 266                 {
 267                 register const struct ih_rdiscovery *ihp;
 268                 register const struct id_rdiscovery *idp;
 269                 u_int lifetime, num, size;
 270
 271                 (void)strcpy(buf, "router advertisement");
 272                 cp = buf + strlen(buf);
 273
 274                 ihp = (struct ih_rdiscovery *)&dp->icmp_void;
 275                 TCHECK(*ihp);
 276                 (void)strcpy(cp, " lifetime ");
 277                 cp = buf + strlen(buf);
 278                 lifetime = EXTRACT_16BITS(&ihp->ird_lifetime);
 279                 if (lifetime < 60)
 280                         (void)sprintf(cp, "%u", lifetime);
 281                 else if (lifetime < 60 * 60)
 282                         (void)sprintf(cp, "%u:%02u",
 283                             lifetime / 60, lifetime % 60);
 284                 else
 285                         (void)sprintf(cp, "%u:%02u:%02u",
 286                             lifetime / 3600,
 287                             (lifetime % 3600) / 60,
 288                             lifetime % 60);
 289                 cp = buf + strlen(buf);
 290
 291                 num = ihp->ird_addrnum;
 292                 (void)sprintf(cp, " %d:", num);
 293                 cp = buf + strlen(buf);
 294
 295                 size = ihp->ird_addrsiz;
 296                 if (size != 2) {
 297                         (void)sprintf(cp, " [size %d]", size);
 298                         break;
 299                 }
 300                 idp = (struct id_rdiscovery *)&dp->icmp_data;
 301                 while (num-- > 0) {
 302                         TCHECK(*idp);
 303                         (void)sprintf(cp, " {%s %u}",
 304                             ipaddr_string(&idp->ird_addr),
 305                             EXTRACT_32BITS(&idp->ird_pref));
 306                         cp = buf + strlen(buf);
 307                 }
 308                 }
 309                 break;
 310
 311         case ICMP_TIMXCEED:
 312                 TCHECK(dp->icmp_ip.ip_dst);
 313                 switch (dp->icmp_code) {
 314
 315                 case ICMP_TIMXCEED_INTRANS:
 316                         str = "time exceeded in-transit";
 317                         break;
 318
 319                 case ICMP_TIMXCEED_REASS:
 320                         str = "ip reassembly time exceeded";
 321                         break;
 322
 323                 default:
 324                         (void)sprintf(buf, "time exceeded-#%d", dp->icmp_code);
 325                         break;
 326                 }
 327                 break;
 328
 329         case ICMP_PARAMPROB:
 330                 if (dp->icmp_code)
 331                         (void)sprintf(buf, "parameter problem - code %d",
 332                                         dp->icmp_code);
 333                 else {
 334                         TCHECK(dp->icmp_pptr);
 335                         (void)sprintf(buf, "parameter problem - octet %d",
 336                                         dp->icmp_pptr);
 337                 }
 338                 break;
 339
 340         case ICMP_MASKREPLY:
 341                 TCHECK(dp->icmp_mask);
 342                 (void)sprintf(buf, "address mask is 0x%08x",
 343                     (u_int32_t)ntohl(dp->icmp_mask));
 344                 break;
 345
 346         default:
 347                 str = tok2str(icmp2str, "type-#%d", dp->icmp_type);
 348                 break;
 349         }
 350         (void)printf("icmp: %s", str);
 351         return;
 352 trunc:
 353         fputs("[|icmp]", stdout);
 354 }