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 #include <config.h>
  27
  28 #include "netdissect-stdinc.h"
  29
  30 #include <stdio.h>
  31
  32 #define ND_LONGJMP_FROM_TCHECK
  33 #include "netdissect.h"
  34 #include "addrtoname.h"
  35 #include "extract.h"
  36
  37 /* well-known sockets */
  38 #define IPX_SKT_NCP             0x0451
  39 #define IPX_SKT_SAP             0x0452
  40 #define IPX_SKT_RIP             0x0453
  41 #define IPX_SKT_NETBIOS         0x0455
  42 #define IPX_SKT_DIAGNOSTICS     0x0456
  43 #define IPX_SKT_NWLINK_DGM      0x0553  /* NWLink datagram, may contain SMB */
  44 #define IPX_SKT_EIGRP           0x85be  /* Cisco EIGRP over IPX */
  45
  46 /* IPX transport header */
  47 struct ipxHdr {
  48     nd_uint16_t cksum;          /* Checksum */
  49     nd_uint16_t length;         /* Length, in bytes, including header */
  50     nd_uint8_t  tCtl;           /* Transport Control (i.e. hop count) */
  51     nd_uint8_t  pType;          /* Packet Type (i.e. level 2 protocol) */
  52     nd_uint32_t dstNet;         /* destination net */
  53     nd_mac48    dstNode;        /* destination node */
  54     nd_uint16_t dstSkt;         /* destination socket */
  55     nd_uint32_t srcNet;         /* source net */
  56     nd_mac48    srcNode;        /* source node */
  57     nd_uint16_t srcSkt;         /* source socket */
  58 };
  59
  60 #define ipxSize 30
  61
  62 static const char *ipxaddr_string(netdissect_options *, uint32_t, const u_char *);
  63 static void ipx_decode(netdissect_options *, const struct ipxHdr *, const u_char *, u_int);
  64 static void ipx_sap_print(netdissect_options *, const u_char *, u_int);
  65 static void ipx_rip_print(netdissect_options *, const u_char *, u_int);
  66
  67 /*
  68  * Print IPX datagram packets.
  69  */
  70 void
  71 ipx_print(netdissect_options *ndo, const u_char *p, u_int length)
  72 {
  73         const struct ipxHdr *ipx = (const struct ipxHdr *)p;
  74
  75         ndo->ndo_protocol = "ipx";
  76         if (!ndo->ndo_eflag)
  77                 ND_PRINT("IPX ");
  78
  79         ND_PRINT("%s.%04x > ",
  80                      ipxaddr_string(ndo, GET_BE_U_4(ipx->srcNet), ipx->srcNode),
  81                      GET_BE_U_2(ipx->srcSkt));
  82
  83         ND_PRINT("%s.%04x: ",
  84                      ipxaddr_string(ndo, GET_BE_U_4(ipx->dstNet), ipx->dstNode),
  85                      GET_BE_U_2(ipx->dstSkt));
  86
  87         /* take length from ipx header */
  88         length = GET_BE_U_2(ipx->length);
  89
  90         if (length < ipxSize) {
  91                 ND_PRINT("[length %u < %u]", length, ipxSize);
  92                 nd_print_invalid(ndo);
  93                 return;
  94         }
  95         ipx_decode(ndo, ipx, p + ipxSize, length - ipxSize);
  96 }
  97
  98 static const char *
  99 ipxaddr_string(netdissect_options *ndo, uint32_t net, const u_char *node)
 100 {
 101     static char line[256];
 102
 103     snprintf(line, sizeof(line), "%08x.%02x:%02x:%02x:%02x:%02x:%02x",
 104             net, GET_U_1(node), GET_U_1(node + 1),
 105             GET_U_1(node + 2), GET_U_1(node + 3),
 106             GET_U_1(node + 4), GET_U_1(node + 5));
 107
 108     return line;
 109 }
 110
 111 static void
 112 ipx_decode(netdissect_options *ndo, const struct ipxHdr *ipx, const u_char *datap, u_int length)
 113 {
 114     u_short dstSkt;
 115
 116     dstSkt = GET_BE_U_2(ipx->dstSkt);
 117     switch (dstSkt) {
 118       case IPX_SKT_NCP:
 119         ND_PRINT("ipx-ncp %u", length);
 120         break;
 121       case IPX_SKT_SAP:
 122         ipx_sap_print(ndo, datap, length);
 123         break;
 124       case IPX_SKT_RIP:
 125         ipx_rip_print(ndo, datap, length);
 126         break;
 127       case IPX_SKT_NETBIOS:
 128         ND_PRINT("ipx-netbios %u", length);
 129 #ifdef ENABLE_SMB
 130         ipx_netbios_print(ndo, datap, length);
 131 #endif
 132         break;
 133       case IPX_SKT_DIAGNOSTICS:
 134         ND_PRINT("ipx-diags %u", length);
 135         break;
 136       case IPX_SKT_NWLINK_DGM:
 137         ND_PRINT("ipx-nwlink-dgm %u", length);
 138 #ifdef ENABLE_SMB
 139         ipx_netbios_print(ndo, datap, length);
 140 #endif
 141         break;
 142       case IPX_SKT_EIGRP:
 143         eigrp_print(ndo, datap, length);
 144         break;
 145       default:
 146         ND_PRINT("ipx-#%x %u", dstSkt, length);
 147         break;
 148     }
 149 }
 150
 151 static void
 152 ipx_sap_print(netdissect_options *ndo, const u_char *ipx, u_int length)
 153 {
 154     int command, i;
 155
 156     command = GET_BE_U_2(ipx);
 157     ND_ICHECK_U(length, <, 2);
 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_ICHECK_U(length, <, 2);
 181             ND_PRINT(" %s '", ipxsap_string(ndo, htons(GET_BE_U_2(ipx))));
 182             ipx += 2;
 183             length -= 2;
 184             if (length < 48) {
 185                 ND_PRINT("'");
 186                 goto invalid;
 187             }
 188             nd_printjnp(ndo, ipx, 48);
 189             ND_PRINT("'");
 190             ipx += 48;
 191             length -= 48;
 192             /*
 193              * 10 bytes of IPX address.
 194              */
 195             ND_ICHECK_U(length, <, 10);
 196             ND_PRINT(" addr %s",
 197                 ipxaddr_string(ndo, GET_BE_U_4(ipx), ipx + 4));
 198             ipx += 10;
 199             length -= 10;
 200             /*
 201              * 2 bytes of socket and 2 bytes of number of intermediate
 202              * networks.
 203              */
 204             ND_ICHECK_U(length, <, 4);
 205             ND_TCHECK_4(ipx);
 206             ipx += 4;
 207             length -= 4;
 208         }
 209         break;
 210       default:
 211         ND_PRINT("ipx-sap-?%x", command);
 212         break;
 213     }
 214     return;
 215
 216 invalid:
 217     nd_print_invalid(ndo);
 218 }
 219
 220 static void
 221 ipx_rip_print(netdissect_options *ndo, const u_char *ipx, u_int length)
 222 {
 223     int command, i;
 224
 225     command = GET_BE_U_2(ipx);
 226     ND_ICHECK_U(length, <, 2);
 227     ipx += 2;
 228     length -= 2;
 229
 230     switch (command) {
 231       case 1:
 232         ND_PRINT("ipx-rip-req");
 233         if (length != 0) {
 234             ND_ICHECK_U(length, <, 8);
 235             ND_PRINT(" %08x/%u.%u", GET_BE_U_4(ipx),
 236                          GET_BE_U_2(ipx + 4), GET_BE_U_2(ipx + 6));
 237         }
 238         break;
 239       case 2:
 240         ND_PRINT("ipx-rip-resp");
 241         for (i = 0; i < 50 && length != 0; i++) {
 242             ND_ICHECK_U(length, <, 8);
 243             ND_PRINT(" %08x/%u.%u", GET_BE_U_4(ipx),
 244                          GET_BE_U_2(ipx + 4), GET_BE_U_2(ipx + 6));
 245
 246             ipx += 8;
 247             length -= 8;
 248         }
 249         break;
 250       default:
 251         ND_PRINT("ipx-rip-?%x", command);
 252         break;
 253     }
 254     return;
 255
 256 invalid:
 257     nd_print_invalid(ndo);
 258 }