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