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(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(EXTRACT_BE_U_4(ipx->srcNet), ipx->srcNode),
  83                      EXTRACT_BE_U_2(ipx->srcSkt));
  84
  85         ND_PRINT("%s.%04x: ",
  86                      ipxaddr_string(EXTRACT_BE_U_4(ipx->dstNet), ipx->dstNode),
  87                      EXTRACT_BE_U_2(ipx->dstSkt));
  88
  89         /* take length from ipx header */
  90         ND_TCHECK_2(ipx->length);
  91         length = EXTRACT_BE_U_2(ipx->length);
  92
  93         ipx_decode(ndo, ipx, p + ipxSize, length - ipxSize);
  94         return;
  95 trunc:
  96         nd_print_trunc(ndo);
  97 }
  98
  99 static const char *
 100 ipxaddr_string(uint32_t net, const u_char *node)
 101 {
 102     static char line[256];
 103
 104     nd_snprintf(line, sizeof(line), "%08x.%02x:%02x:%02x:%02x:%02x:%02x",
 105             net, EXTRACT_U_1(node), EXTRACT_U_1(node + 1),
 106             EXTRACT_U_1(node + 2), EXTRACT_U_1(node + 3),
 107             EXTRACT_U_1(node + 4), EXTRACT_U_1(node + 5));
 108
 109     return line;
 110 }
 111
 112 static void
 113 ipx_decode(netdissect_options *ndo, const struct ipxHdr *ipx, const u_char *datap, u_int length)
 114 {
 115     u_short dstSkt;
 116
 117     dstSkt = EXTRACT_BE_U_2(ipx->dstSkt);
 118     switch (dstSkt) {
 119       case IPX_SKT_NCP:
 120         ND_PRINT("ipx-ncp %u", length);
 121         break;
 122       case IPX_SKT_SAP:
 123         ipx_sap_print(ndo, datap, length);
 124         break;
 125       case IPX_SKT_RIP:
 126         ipx_rip_print(ndo, datap, length);
 127         break;
 128       case IPX_SKT_NETBIOS:
 129         ND_PRINT("ipx-netbios %u", length);
 130 #ifdef ENABLE_SMB
 131         ipx_netbios_print(ndo, datap, length);
 132 #endif
 133         break;
 134       case IPX_SKT_DIAGNOSTICS:
 135         ND_PRINT("ipx-diags %u", length);
 136         break;
 137       case IPX_SKT_NWLINK_DGM:
 138         ND_PRINT("ipx-nwlink-dgm %u", length);
 139 #ifdef ENABLE_SMB
 140         ipx_netbios_print(ndo, datap, length);
 141 #endif
 142         break;
 143       case IPX_SKT_EIGRP:
 144         eigrp_print(ndo, datap, length);
 145         break;
 146       default:
 147         ND_PRINT("ipx-#%x %u", dstSkt, length);
 148         break;
 149     }
 150 }
 151
 152 static void
 153 ipx_sap_print(netdissect_options *ndo, const u_char *ipx, u_int length)
 154 {
 155     int command, i;
 156
 157     ND_TCHECK_2(ipx);
 158     command = EXTRACT_BE_U_2(ipx);
 159     ipx += 2;
 160     length -= 2;
 161
 162     switch (command) {
 163       case 1:
 164       case 3:
 165         if (command == 1)
 166             ND_PRINT("ipx-sap-req");
 167         else
 168             ND_PRINT("ipx-sap-nearest-req");
 169
 170         ND_TCHECK_2(ipx);
 171         ND_PRINT(" %s", ipxsap_string(ndo, htons(EXTRACT_BE_U_2(ipx))));
 172         break;
 173
 174       case 2:
 175       case 4:
 176         if (command == 2)
 177             ND_PRINT("ipx-sap-resp");
 178         else
 179             ND_PRINT("ipx-sap-nearest-resp");
 180
 181         for (i = 0; i < 8 && length != 0; i++) {
 182             ND_TCHECK_2(ipx);
 183             if (length < 2)
 184                 goto trunc;
 185             ND_PRINT(" %s '", ipxsap_string(ndo, htons(EXTRACT_BE_U_2(ipx))));
 186             ipx += 2;
 187             length -= 2;
 188             if (length < 48) {
 189                 ND_PRINT("'");
 190                 goto trunc;
 191             }
 192             if (nd_printzp(ndo, ipx, 48, ndo->ndo_snapend)) {
 193                 ND_PRINT("'");
 194                 goto trunc;
 195             }
 196             ND_PRINT("'");
 197             ipx += 48;
 198             length -= 48;
 199             /*
 200              * 10 bytes of IPX address.
 201              */
 202             ND_TCHECK_LEN(ipx, 10);
 203             if (length < 10)
 204                 goto trunc;
 205             ND_PRINT(" addr %s",
 206                 ipxaddr_string(EXTRACT_BE_U_4(ipx), ipx + 4));
 207             ipx += 10;
 208             length -= 10;
 209             /*
 210              * 2 bytes of socket and 2 bytes of number of intermediate
 211              * networks.
 212              */
 213             ND_TCHECK_4(ipx);
 214             if (length < 4)
 215                 goto trunc;
 216             ipx += 4;
 217             length -= 4;
 218         }
 219         break;
 220       default:
 221         ND_PRINT("ipx-sap-?%x", command);
 222         break;
 223     }
 224     return;
 225 trunc:
 226     nd_print_trunc(ndo);
 227 }
 228
 229 static void
 230 ipx_rip_print(netdissect_options *ndo, const u_char *ipx, u_int length)
 231 {
 232     int command, i;
 233
 234     ND_TCHECK_2(ipx);
 235     command = EXTRACT_BE_U_2(ipx);
 236     ipx += 2;
 237     length -= 2;
 238
 239     switch (command) {
 240       case 1:
 241         ND_PRINT("ipx-rip-req");
 242         if (length != 0) {
 243             if (length < 8)
 244                 goto trunc;
 245             ND_TCHECK_8(ipx);
 246             ND_PRINT(" %08x/%u.%u", EXTRACT_BE_U_4(ipx),
 247                          EXTRACT_BE_U_2(ipx + 4), EXTRACT_BE_U_2(ipx + 6));
 248         }
 249         break;
 250       case 2:
 251         ND_PRINT("ipx-rip-resp");
 252         for (i = 0; i < 50 && length != 0; i++) {
 253             if (length < 8)
 254                 goto trunc;
 255             ND_TCHECK_8(ipx);
 256             ND_PRINT(" %08x/%u.%u", EXTRACT_BE_U_4(ipx),
 257                          EXTRACT_BE_U_2(ipx + 4), EXTRACT_BE_U_2(ipx + 6));
 258
 259             ipx += 8;
 260             length -= 8;
 261         }
 262         break;
 263       default:
 264         ND_PRINT("ipx-rip-?%x", command);
 265         break;
 266     }
 267     return;
 268 trunc:
 269     nd_print_trunc(ndo);
 270 }