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_PRINT("%s.%04x > ",
  81                      ipxaddr_string(ndo, GET_BE_U_4(ipx->srcNet), ipx->srcNode),
  82                      GET_BE_U_2(ipx->srcSkt));
  83
  84         ND_PRINT("%s.%04x: ",
  85                      ipxaddr_string(ndo, GET_BE_U_4(ipx->dstNet), ipx->dstNode),
  86                      GET_BE_U_2(ipx->dstSkt));
  87
  88         /* take length from ipx header */
  89         length = GET_BE_U_2(ipx->length);
  90
  91         if (length < ipxSize) {
  92                 ND_PRINT("[length %u < %u]", length, ipxSize);
  93                 nd_print_invalid(ndo);
  94                 return;
  95         }
  96         ipx_decode(ndo, ipx, p + ipxSize, length - ipxSize);
  97 }
  98
  99 static const char *
 100 ipxaddr_string(netdissect_options *ndo, uint32_t net, const u_char *node)
 101 {
 102     static char line[256];
 103
 104     snprintf(line, sizeof(line), "%08x.%02x:%02x:%02x:%02x:%02x:%02x",
 105             net, GET_U_1(node), GET_U_1(node + 1),
 106             GET_U_1(node + 2), GET_U_1(node + 3),
 107             GET_U_1(node + 4), GET_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 = GET_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     command = GET_BE_U_2(ipx);
 158     ipx += 2;
 159     length -= 2;
 160
 161     switch (command) {
 162       case 1:
 163       case 3:
 164         if (command == 1)
 165             ND_PRINT("ipx-sap-req");
 166         else
 167             ND_PRINT("ipx-sap-nearest-req");
 168
 169         ND_PRINT(" %s", ipxsap_string(ndo, htons(GET_BE_U_2(ipx))));
 170         break;
 171
 172       case 2:
 173       case 4:
 174         if (command == 2)
 175             ND_PRINT("ipx-sap-resp");
 176         else
 177             ND_PRINT("ipx-sap-nearest-resp");
 178
 179         for (i = 0; i < 8 && length != 0; i++) {
 180             ND_TCHECK_2(ipx);
 181             if (length < 2)
 182                 goto trunc;
 183             ND_PRINT(" %s '", ipxsap_string(ndo, htons(GET_BE_U_2(ipx))));
 184             ipx += 2;
 185             length -= 2;
 186             if (length < 48) {
 187                 ND_PRINT("'");
 188                 goto trunc;
 189             }
 190             if (nd_printzp(ndo, ipx, 48, ndo->ndo_snapend)) {
 191                 ND_PRINT("'");
 192                 goto trunc;
 193             }
 194             ND_PRINT("'");
 195             ipx += 48;
 196             length -= 48;
 197             /*
 198              * 10 bytes of IPX address.
 199              */
 200             ND_TCHECK_LEN(ipx, 10);
 201             if (length < 10)
 202                 goto trunc;
 203             ND_PRINT(" addr %s",
 204                 ipxaddr_string(ndo, GET_BE_U_4(ipx), ipx + 4));
 205             ipx += 10;
 206             length -= 10;
 207             /*
 208              * 2 bytes of socket and 2 bytes of number of intermediate
 209              * networks.
 210              */
 211             ND_TCHECK_4(ipx);
 212             if (length < 4)
 213                 goto trunc;
 214             ipx += 4;
 215             length -= 4;
 216         }
 217         break;
 218       default:
 219         ND_PRINT("ipx-sap-?%x", command);
 220         break;
 221     }
 222     return;
 223 trunc:
 224     nd_print_trunc(ndo);
 225 }
 226
 227 static void
 228 ipx_rip_print(netdissect_options *ndo, const u_char *ipx, u_int length)
 229 {
 230     int command, i;
 231
 232     command = GET_BE_U_2(ipx);
 233     ipx += 2;
 234     length -= 2;
 235
 236     switch (command) {
 237       case 1:
 238         ND_PRINT("ipx-rip-req");
 239         if (length != 0) {
 240             if (length < 8)
 241                 goto trunc;
 242             ND_PRINT(" %08x/%u.%u", GET_BE_U_4(ipx),
 243                          GET_BE_U_2(ipx + 4), GET_BE_U_2(ipx + 6));
 244         }
 245         break;
 246       case 2:
 247         ND_PRINT("ipx-rip-resp");
 248         for (i = 0; i < 50 && length != 0; i++) {
 249             if (length < 8)
 250                 goto trunc;
 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             ipx += 8;
 255             length -= 8;
 256         }
 257         break;
 258       default:
 259         ND_PRINT("ipx-rip-?%x", command);
 260         break;
 261     }
 262     return;
 263 trunc:
 264     nd_print_trunc(ndo);
 265 }