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

   1 /*
   2  * Copyright (c) 1998-2004  Hannes Gredler <hannes@tcpdump.org>
   3  *      The TCPDUMP project
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that: (1) source code
   7  * distributions retain the above copyright notice and this paragraph
   8  * in its entirety, and (2) distributions including binary code include
   9  * the above copyright notice and this paragraph in its entirety in
  10  * the documentation or other materials provided with the distribution.
  11  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND
  12  * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
  13  * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  14  * FOR A PARTICULAR PURPOSE.
  15  */
  16
  17 #ifndef lint
  18 static const char rcsid[] _U_ =
  19     "@(#) $Header: /tcpdump/master/tcpdump/print-eigrp.c,v 1.2 2004-04-30 23:52:00 hannes Exp $";
  20 #endif
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include "config.h"
  24 #endif
  25
  26 #include <tcpdump-stdinc.h>
  27
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31
  32 #include "interface.h"
  33 #include "extract.h"
  34 #include "addrtoname.h"
  35
  36 /*
  37  * packet format documented at
  38  * http://www.rhyshaden.com/eigrp.htm
  39  */
  40
  41 struct eigrp_common_header {
  42     u_int8_t version;
  43     u_int8_t opcode;
  44     u_int8_t checksum[2];
  45     u_int8_t flags[4];
  46     u_int8_t seq[4];
  47     u_int8_t ack[4];
  48     u_int8_t asn[4];
  49 };
  50
  51 #define EIGRP_VERSION                        2
  52
  53 #define EIGRP_OPCODE_UPDATE                  1
  54 #define EIGRP_OPCODE_QUERY                   3
  55 #define EIGRP_OPCODE_REPLY                   4
  56 #define EIGRP_OPCODE_HELLO                   5
  57 #define EIGRP_OPCODE_IPXSAP                  6
  58 #define EIGRP_OPCODE_PROBE                   7
  59
  60 static const struct tok eigrp_opcode_values[] = {
  61     { EIGRP_OPCODE_UPDATE, "Update" },
  62     { EIGRP_OPCODE_QUERY, "Query" },
  63     { EIGRP_OPCODE_REPLY, "Reply" },
  64     { EIGRP_OPCODE_HELLO, "Hello" },
  65     { EIGRP_OPCODE_IPXSAP, "IPX SAP" },
  66     { EIGRP_OPCODE_PROBE, "Probe" },
  67     { 0, NULL}
  68 };
  69
  70 struct eigrp_tlv_header {
  71     u_int8_t type[2];
  72     u_int8_t length[2];
  73 };
  74
  75 #define EIGRP_TLV_GENERAL_PARM   0x0001
  76 #define EIGRP_TLV_AUTH           0x0002
  77 #define EIGRP_TLV_SEQ            0x0003
  78 #define EIGRP_TLV_SW_VERSION     0x0004
  79 #define EIGRP_TLV_MCAST_SEQ      0x0005
  80 #define EIGRP_TLV_IP_INT         0x0102
  81 #define EIGRP_TLV_IP_EXT         0x0103
  82 #define EIGRP_TLV_AT_INT         0x0202
  83 #define EIGRP_TLV_AT_EXT         0x0203
  84 #define EIGRP_TLV_AT_CABLE_SETUP 0x0204
  85 #define EIGRP_TLV_IPX_INT        0x0302
  86 #define EIGRP_TLV_IPX_EXT        0x0303
  87
  88 static const struct tok eigrp_tlv_values[] = {
  89     { EIGRP_TLV_GENERAL_PARM, "General Parameters"},
  90     { EIGRP_TLV_AUTH, "Authentication"},
  91     { EIGRP_TLV_SEQ, "Sequence"},
  92     { EIGRP_TLV_SW_VERSION, "Software Version"},
  93     { EIGRP_TLV_MCAST_SEQ, "Next Multicast Sequence"},
  94     { EIGRP_TLV_IP_INT, "IP Internal routes"},
  95     { EIGRP_TLV_IP_EXT, "IP External routes"},
  96     { EIGRP_TLV_AT_INT, "AppleTalk Internal routes"},
  97     { EIGRP_TLV_AT_EXT, "AppleTalk External routes"},
  98     { EIGRP_TLV_AT_CABLE_SETUP, "AppleTalk Cable setup"},
  99     { EIGRP_TLV_IPX_INT, "IPX Internal routes"},
 100     { EIGRP_TLV_IPX_EXT, "IPX External routes"},
 101     { 0, NULL}
 102 };
 103
 104 struct eigrp_tlv_general_parm {
 105     u_int8_t k1;
 106     u_int8_t k2;
 107     u_int8_t k3;
 108     u_int8_t k4;
 109     u_int8_t k5;
 110     u_int8_t res;
 111     u_int8_t holdtime[2];
 112 };
 113
 114 struct eigrp_tlv_sw_version {
 115     u_int8_t ios_major;
 116     u_int8_t ios_minor;
 117     u_int8_t eigrp_major;
 118     u_int8_t eigrp_minor;
 119 };
 120
 121 void
 122 eigrp_print(register const u_char *pptr, register u_int len) {
 123
 124     const struct eigrp_common_header *eigrp_com_header;
 125     const struct eigrp_tlv_header *eigrp_tlv_header;
 126     const u_char *tptr,*tlv_tptr;
 127     int tlen,eigrp_tlv_len,eigrp_tlv_type,tlv_tlen;
 128
 129     union {
 130         const struct eigrp_tlv_general_parm *eigrp_tlv_general_parm;
 131         const struct eigrp_tlv_sw_version *eigrp_tlv_sw_version;
 132     } tlv_ptr;
 133
 134     tptr=pptr;
 135     eigrp_com_header = (const struct eigrp_common_header *)pptr;
 136     TCHECK(*eigrp_com_header);
 137
 138     /*
 139      * Sanity checking of the header.
 140      */
 141     if (eigrp_com_header->version != EIGRP_VERSION) {
 142         printf("EIGRP version %u packet not supported",eigrp_com_header->version);
 143         return;
 144     }
 145
 146     /* in non-verbose mode just lets print the basic Message Type*/
 147     if (vflag < 1) {
 148         printf("EIGRP %s, length: %u",
 149                tok2str(eigrp_opcode_values, "unknown (%u)",eigrp_com_header->opcode),
 150                len);
 151         return;
 152     }
 153
 154     /* ok they seem to want to know everything - lets fully decode it */
 155
 156     tlen=len-sizeof(struct eigrp_common_header);
 157
 158     /* FIXME print other header info */
 159     printf("\n\tEIGRP v%u, opcode: %s (%u), chksum: 0x%04x, Flags: [0x%08x]\n\tseq: 0x%08x, ack: 0x%08x, AS: %u, length: %u",
 160            eigrp_com_header->version,
 161            tok2str(eigrp_opcode_values, "unknown, type: %u",eigrp_com_header->opcode),
 162            eigrp_com_header->opcode,
 163            EXTRACT_16BITS(&eigrp_com_header->checksum),
 164            EXTRACT_32BITS(&eigrp_com_header->flags),
 165            EXTRACT_32BITS(&eigrp_com_header->seq),
 166            EXTRACT_32BITS(&eigrp_com_header->ack),
 167            EXTRACT_32BITS(&eigrp_com_header->asn),
 168            tlen);
 169
 170     tptr+=sizeof(const struct eigrp_common_header);
 171
 172     while(tlen>0) {
 173         /* did we capture enough for fully decoding the object header ? */
 174         if (!TTEST2(*tptr, sizeof(struct eigrp_tlv_header)))
 175             goto trunc;
 176
 177         eigrp_tlv_header = (const struct eigrp_tlv_header *)tptr;
 178         eigrp_tlv_len=EXTRACT_16BITS(&eigrp_tlv_header->length);
 179         eigrp_tlv_type=EXTRACT_16BITS(&eigrp_tlv_header->type);
 180
 181
 182         if (eigrp_tlv_len == 0 || eigrp_tlv_len > tlen) {
 183             print_unknown_data(tptr+sizeof(sizeof(struct eigrp_tlv_header)),"\n\t    ",tlen);
 184             return;
 185         }
 186
 187         printf("\n\t  %s TLV (0x%04x), length: %u",
 188                tok2str(eigrp_tlv_values,
 189                        "Unknown",
 190                        eigrp_tlv_type),
 191                eigrp_tlv_type,
 192                eigrp_tlv_len);
 193
 194         tlv_tptr=tptr+sizeof(struct eigrp_tlv_header);
 195         tlv_tlen=eigrp_tlv_len-sizeof(struct eigrp_tlv_header);
 196
 197         /* did we capture enough for fully decoding the object ? */
 198         if (!TTEST2(*tptr, eigrp_tlv_len))
 199             goto trunc;
 200
 201         switch(eigrp_tlv_type) {
 202
 203         case EIGRP_TLV_GENERAL_PARM:
 204             tlv_ptr.eigrp_tlv_general_parm = (const struct eigrp_tlv_general_parm *)tlv_tptr;
 205             printf("\n\t    holdtime: %us, k1 %u, k2 %u, k3 %u, k4 %u, k5 %u",
 206                    EXTRACT_16BITS(tlv_ptr.eigrp_tlv_general_parm->holdtime),
 207                    tlv_ptr.eigrp_tlv_general_parm->k1,
 208                    tlv_ptr.eigrp_tlv_general_parm->k2,
 209                    tlv_ptr.eigrp_tlv_general_parm->k3,
 210                    tlv_ptr.eigrp_tlv_general_parm->k4,
 211                    tlv_ptr.eigrp_tlv_general_parm->k5);
 212             break;
 213
 214         case EIGRP_TLV_SW_VERSION:
 215             tlv_ptr.eigrp_tlv_sw_version = (const struct eigrp_tlv_sw_version *)tlv_tptr;
 216             printf("\n\t    IOS version: %u.%u, EIGRP version %u.%u",
 217                    tlv_ptr.eigrp_tlv_sw_version->ios_major,
 218                    tlv_ptr.eigrp_tlv_sw_version->ios_minor,
 219                    tlv_ptr.eigrp_tlv_sw_version->eigrp_major,
 220                    tlv_ptr.eigrp_tlv_sw_version->eigrp_minor);
 221             break;
 222
 223             /*
 224              * FIXME those are the defined TLVs that lack a decoder
 225              * you are welcome to contribute code ;-)
 226              */
 227
 228         case EIGRP_TLV_AUTH:
 229         case EIGRP_TLV_SEQ:
 230         case EIGRP_TLV_MCAST_SEQ:
 231         case EIGRP_TLV_IP_INT:
 232         case EIGRP_TLV_IP_EXT:
 233         case EIGRP_TLV_AT_INT:
 234         case EIGRP_TLV_AT_EXT:
 235         case EIGRP_TLV_AT_CABLE_SETUP:
 236         case EIGRP_TLV_IPX_INT:
 237         case EIGRP_TLV_IPX_EXT:
 238
 239         default:
 240             if (vflag <= 1)
 241                 print_unknown_data(tlv_tptr,"\n\t    ",tlv_tlen);
 242             break;
 243         }
 244         /* do we want to see an additionally hexdump ? */
 245         if (vflag > 1)
 246             print_unknown_data(tptr+sizeof(sizeof(struct eigrp_tlv_header)),"\n\t    ",
 247                                eigrp_tlv_len-sizeof(struct eigrp_tlv_header));
 248
 249         tptr+=eigrp_tlv_len;
 250         tlen-=eigrp_tlv_len;
 251     }
 252     return;
 253 trunc:
 254     printf("\n\t\t packet exceeded snapshot");
 255 }