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

   1 /*
   2  * Copyright (c) 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  * Contributed by Brad Parker (brad@fcr.com).
  22  */
  23
  24 /* \summary: Novell IPX printer */
  25
  26 #ifdef HAVE_CONFIG_H
  27 #include <config.h>
  28 #endif
  29
  30 #include "netdissect-stdinc.h"
  31
  32 #include <stdio.h>
  33
  34 #include "netdissect.h"
  35 #include "addrtoname.h"
  36 #include "extract.h"
  37
  38 /* well-known sockets */
  39 #define IPX_SKT_NCP             0x0451
  40 #define IPX_SKT_SAP             0x0452
  41 #define IPX_SKT_RIP             0x0453
  42 #define IPX_SKT_NETBIOS         0x0455
  43 #define IPX_SKT_DIAGNOSTICS     0x0456
  44 #define IPX_SKT_NWLINK_DGM      0x0553  /* NWLink datagram, may contain SMB */
  45 #define IPX_SKT_EIGRP           0x85be  /* Cisco EIGRP over IPX */
  46
  47 /* IPX transport header */
  48 struct ipxHdr {
  49     nd_uint16_t cksum;          /* Checksum */
  50     nd_uint16_t length;         /* Length, in bytes, including header */
  51     nd_uint8_t  tCtl;           /* Transport Control (i.e. hop count) */
  52     nd_uint8_t  pType;          /* Packet Type (i.e. level 2 protocol) */
  53     nd_uint32_t dstNet;         /* destination net */
  54     nd_byte     dstNode[6];     /* destination node */
  55     nd_uint16_t dstSkt;         /* destination socket */
  56     nd_uint32_t srcNet;         /* source net */
  57     nd_byte     srcNode[6];     /* source node */
  58     nd_uint16_t srcSkt;         /* source socket */
  59 };
  60
  61 #define ipxSize 30
  62
  63 static const char *ipxaddr_string(netdissect_options *, uint32_t, const u_char *);
  64 static void ipx_decode(netdissect_options *, const struct ipxHdr *, const u_char *, u_int);
  65 static void ipx_sap_print(netdissect_options *, const u_char *, u_int);
  66 static void ipx_rip_print(netdissect_options *, const u_char *, u_int);
  67
  68 /*
  69  * Print IPX datagram packets.
  70  */
  71 void
  72 ipx_print(netdissect_options *ndo, const u_char *p, u_int length)
  73 {
  74         const struct ipxHdr *ipx = (const struct ipxHdr *)p;
  75
  76         ndo->ndo_protocol = "ipx";
  77         if (!ndo->ndo_eflag)
  78                 ND_PRINT("IPX ");
  79
  80         ND_TCHECK_2(ipx->srcSkt);
  81         ND_PRINT("%s.%04x > ",
  82                      ipxaddr_string(ndo, GET_BE_U_4(ipx->srcNet), ipx->srcNode),
  83                      GET_BE_U_2(ipx->srcSkt));
  84
  85         ND_PRINT("%s.%04x: ",
  86                      ipxaddr_string(ndo, GET_BE_U_4(ipx->dstNet), ipx->dstNode),
  87                      GET_BE_U_2(ipx->dstSkt));
  88
  89         /* take length from ipx header */
  90         ND_TCHECK_2(ipx->length);
  91         length = GET_BE_U_2(ipx->length);
  92
  93         if (length < ipxSize) {
  94                 ND_PRINT("[length %u < %u]", length, ipxSize);
  95                 nd_print_invalid(ndo);
  96                 return;
  97         }
  98         ipx_decode(ndo, ipx, p + ipxSize, length - ipxSize);
  99         return;
 100 trunc:
 101         nd_print_trunc(ndo);
 102 }
 103
 104 static const char *
 105 ipxaddr_string(netdissect_options *ndo, uint32_t net, const u_char *node)
 106 {
 107     static char line[256];
 108
 109     snprintf(line, sizeof(line), "%08x.%02x:%02x:%02x:%02x:%02x:%02x",
 110             net, GET_U_1(node), GET_U_1(node + 1),
 111             GET_U_1(node + 2), GET_U_1(node + 3),
 112             GET_U_1(node + 4), GET_U_1(node + 5));
 113
 114     return line;
 115 }
 116
 117 static void
 118 ipx_decode(netdissect_options *ndo, const struct ipxHdr *ipx, const u_char *datap, u_int length)
 119 {
 120     u_short dstSkt;
 121
 122     dstSkt = GET_BE_U_2(ipx->dstSkt);
 123     switch (dstSkt) {
 124       case IPX_SKT_NCP:
 125         ND_PRINT("ipx-ncp %u", length);
 126         break;
 127       case IPX_SKT_SAP:
 128         ipx_sap_print(ndo, datap, length);
 129         break;
 130       case IPX_SKT_RIP:
 131         ipx_rip_print(ndo, datap, length);
 132         break;
 133       case IPX_SKT_NETBIOS:
 134         ND_PRINT("ipx-netbios %u", length);
 135 #ifdef ENABLE_SMB
 136         ipx_netbios_print(ndo, datap, length);
 137 #endif
 138         break;
 139       case IPX_SKT_DIAGNOSTICS:
 140         ND_PRINT("ipx-diags %u", length);
 141         break;
 142       case IPX_SKT_NWLINK_DGM:
 143         ND_PRINT("ipx-nwlink-dgm %u", length);
 144 #ifdef ENABLE_SMB
 145         ipx_netbios_print(ndo, datap, length);
 146 #endif
 147         break;
 148       case IPX_SKT_EIGRP:
 149         eigrp_print(ndo, datap, length);
 150         break;
 151       default:
 152         ND_PRINT("ipx-#%x %u", dstSkt, length);
 153         break;
 154     }
 155 }
 156
 157 static void
 158 ipx_sap_print(netdissect_options *ndo, const u_char *ipx, u_int length)
 159 {
 160     int command, i;
 161
 162     ND_TCHECK_2(ipx);
 163     command = GET_BE_U_2(ipx);
 164     ipx += 2;
 165     length -= 2;
 166
 167     switch (command) {
 168       case 1:
 169       case 3:
 170         if (command == 1)
 171             ND_PRINT("ipx-sap-req");
 172         else
 173             ND_PRINT("ipx-sap-nearest-req");
 174
 175         ND_TCHECK_2(ipx);
 176         ND_PRINT(" %s", ipxsap_string(ndo, htons(GET_BE_U_2(ipx))));
 177         break;
 178
 179       case 2:
 180       case 4:
 181         if (command == 2)
 182             ND_PRINT("ipx-sap-resp");
 183         else
 184             ND_PRINT("ipx-sap-nearest-resp");
 185
 186         for (i = 0; i < 8 && length != 0; i++) {
 187             ND_TCHECK_2(ipx);
 188             if (length < 2)
 189                 goto trunc;
 190             ND_PRINT(" %s '", ipxsap_string(ndo, htons(GET_BE_U_2(ipx))));
 191             ipx += 2;
 192             length -= 2;
 193             if (length < 48) {
 194                 ND_PRINT("'");
 195                 goto trunc;
 196             }
 197             if (nd_printzp(ndo, ipx, 48, ndo->ndo_snapend)) {
 198                 ND_PRINT("'");
 199                 goto trunc;
 200             }
 201             ND_PRINT("'");
 202             ipx += 48;
 203             length -= 48;
 204             /*
 205              * 10 bytes of IPX address.
 206              */
 207             ND_TCHECK_LEN(ipx, 10);
 208             if (length < 10)
 209                 goto trunc;
 210             ND_PRINT(" addr %s",
 211                 ipxaddr_string(ndo, GET_BE_U_4(ipx), ipx + 4));
 212             ipx += 10;
 213             length -= 10;
 214             /*
 215              * 2 bytes of socket and 2 bytes of number of intermediate
 216              * networks.
 217              */
 218             ND_TCHECK_4(ipx);
 219             if (length < 4)
 220                 goto trunc;
 221             ipx += 4;
 222             length -= 4;
 223         }
 224         break;
 225       default:
 226         ND_PRINT("ipx-sap-?%x", command);
 227         break;
 228     }
 229     return;
 230 trunc:
 231     nd_print_trunc(ndo);
 232 }
 233
 234 static void
 235 ipx_rip_print(netdissect_options *ndo, const u_char *ipx, u_int length)
 236 {
 237     int command, i;
 238
 239     ND_TCHECK_2(ipx);
 240     command = GET_BE_U_2(ipx);
 241     ipx += 2;
 242     length -= 2;
 243
 244     switch (command) {
 245       case 1:
 246         ND_PRINT("ipx-rip-req");
 247         if (length != 0) {
 248             if (length < 8)
 249                 goto trunc;
 250             ND_TCHECK_8(ipx);
 251             ND_PRINT(" %08x/%u.%u", GET_BE_U_4(ipx),
 252                          GET_BE_U_2(ipx + 4), GET_BE_U_2(ipx + 6));
 253         }
 254         break;
 255       case 2:
 256         ND_PRINT("ipx-rip-resp");
 257         for (i = 0; i < 50 && length != 0; i++) {
 258             if (length < 8)
 259                 goto trunc;
 260             ND_TCHECK_8(ipx);
 261             ND_PRINT(" %08x/%u.%u", GET_BE_U_4(ipx),
 262                          GET_BE_U_2(ipx + 4), GET_BE_U_2(ipx + 6));
 263
 264             ipx += 8;
 265             length -= 8;
 266         }
 267         break;
 268       default:
 269         ND_PRINT("ipx-rip-?%x", command);
 270         break;
 271     }
 272     return;
 273 trunc:
 274     nd_print_trunc(ndo);
 275 }