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     uint16_t    cksum;          /* Checksum */
  50     uint16_t    length;         /* Length, in bytes, including header */
  51     uint8_t     tCtl;           /* Transport Control (i.e. hop count) */
  52     uint8_t     pType;          /* Packet Type (i.e. level 2 protocol) */
  53     uint16_t    dstNet[2];      /* destination net */
  54     uint8_t     dstNode[6];     /* destination node */
  55     uint16_t    dstSkt;         /* destination socket */
  56     uint16_t    srcNet[2];      /* source net */
  57     uint8_t     srcNode[6];     /* source node */
  58     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         if (!ndo->ndo_eflag)
  77                 ND_PRINT((ndo, "IPX "));
  78
  79         ND_TCHECK(ipx->srcSkt);
  80         ND_PRINT((ndo, "%s.%04x > ",
  81                      ipxaddr_string(EXTRACT_BE_U_4(ipx->srcNet), ipx->srcNode),
  82                      EXTRACT_BE_U_2(&ipx->srcSkt)));
  83
  84         ND_PRINT((ndo, "%s.%04x: ",
  85                      ipxaddr_string(EXTRACT_BE_U_4(ipx->dstNet), ipx->dstNode),
  86                      EXTRACT_BE_U_2(&ipx->dstSkt)));
  87
  88         /* take length from ipx header */
  89         ND_TCHECK(ipx->length);
  90         length = EXTRACT_BE_U_2(&ipx->length);
  91
  92         ipx_decode(ndo, ipx, p + ipxSize, length - ipxSize);
  93         return;
  94 trunc:
  95         ND_PRINT((ndo, "[|ipx %d]", length));
  96 }
  97
  98 static const char *
  99 ipxaddr_string(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, EXTRACT_U_1(node), EXTRACT_U_1(node + 1),
 105             EXTRACT_U_1(node + 2), EXTRACT_U_1(node + 3),
 106             EXTRACT_U_1(node + 4), EXTRACT_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 = EXTRACT_BE_U_2(&ipx->dstSkt);
 117     switch (dstSkt) {
 118       case IPX_SKT_NCP:
 119         ND_PRINT((ndo, "ipx-ncp %d", 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((ndo, "ipx-netbios %d", length));
 129 #ifdef ENABLE_SMB
 130         ipx_netbios_print(ndo, datap, length);
 131 #endif
 132         break;
 133       case IPX_SKT_DIAGNOSTICS:
 134         ND_PRINT((ndo, "ipx-diags %d", length));
 135         break;
 136       case IPX_SKT_NWLINK_DGM:
 137         ND_PRINT((ndo, "ipx-nwlink-dgm %d", 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((ndo, "ipx-#%x %d", 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     ND_TCHECK_2(ipx);
 157     command = EXTRACT_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((ndo, "ipx-sap-req"));
 166         else
 167             ND_PRINT((ndo, "ipx-sap-nearest-req"));
 168
 169         ND_TCHECK_2(ipx);
 170         ND_PRINT((ndo, " %s", ipxsap_string(ndo, htons(EXTRACT_BE_U_2(ipx)))));
 171         break;
 172
 173       case 2:
 174       case 4:
 175         if (command == 2)
 176             ND_PRINT((ndo, "ipx-sap-resp"));
 177         else
 178             ND_PRINT((ndo, "ipx-sap-nearest-resp"));
 179
 180         for (i = 0; i < 8 && length != 0; i++) {
 181             ND_TCHECK_2(ipx);
 182             if (length < 2)
 183                 goto trunc;
 184             ND_PRINT((ndo, " %s '", ipxsap_string(ndo, htons(EXTRACT_BE_U_2(ipx)))));
 185             ipx += 2;
 186             length -= 2;
 187             if (length < 48) {
 188                 ND_PRINT((ndo, "'"));
 189                 goto trunc;
 190             }
 191             if (fn_printzp(ndo, ipx, 48, ndo->ndo_snapend)) {
 192                 ND_PRINT((ndo, "'"));
 193                 goto trunc;
 194             }
 195             ND_PRINT((ndo, "'"));
 196             ipx += 48;
 197             length -= 48;
 198             /*
 199              * 10 bytes of IPX address.
 200              */
 201             ND_TCHECK_LEN(ipx, 10);
 202             if (length < 10)
 203                 goto trunc;
 204             ND_PRINT((ndo, " addr %s",
 205                 ipxaddr_string(EXTRACT_BE_U_4(ipx), ipx + 4)));
 206             ipx += 10;
 207             length -= 10;
 208             /*
 209              * 2 bytes of socket and 2 bytes of number of intermediate
 210              * networks.
 211              */
 212             ND_TCHECK_LEN(ipx, 4);
 213             if (length < 4)
 214                 goto trunc;
 215             ipx += 4;
 216             length -= 4;
 217         }
 218         break;
 219       default:
 220         ND_PRINT((ndo, "ipx-sap-?%x", command));
 221         break;
 222     }
 223     return;
 224 trunc:
 225     ND_PRINT((ndo, "[|ipx]"));
 226 }
 227
 228 static void
 229 ipx_rip_print(netdissect_options *ndo, const u_char *ipx, u_int length)
 230 {
 231     int command, i;
 232
 233     ND_TCHECK_2(ipx);
 234     command = EXTRACT_BE_U_2(ipx);
 235     ipx += 2;
 236     length -= 2;
 237
 238     switch (command) {
 239       case 1:
 240         ND_PRINT((ndo, "ipx-rip-req"));
 241         if (length != 0) {
 242             if (length < 8)
 243                 goto trunc;
 244             ND_TCHECK_LEN(ipx, 8);
 245             ND_PRINT((ndo, " %08x/%d.%d", EXTRACT_BE_U_4(ipx),
 246                          EXTRACT_BE_U_2(ipx + 4), EXTRACT_BE_U_2(ipx + 6)));
 247         }
 248         break;
 249       case 2:
 250         ND_PRINT((ndo, "ipx-rip-resp"));
 251         for (i = 0; i < 50 && length != 0; i++) {
 252             if (length < 8)
 253                 goto trunc;
 254             ND_TCHECK_LEN(ipx, 8);
 255             ND_PRINT((ndo, " %08x/%d.%d", EXTRACT_BE_U_4(ipx),
 256                          EXTRACT_BE_U_2(ipx + 4), EXTRACT_BE_U_2(ipx + 6)));
 257
 258             ipx += 8;
 259             length -= 8;
 260         }
 261         break;
 262       default:
 263         ND_PRINT((ndo, "ipx-rip-?%x", command));
 264         break;
 265     }
 266     return;
 267 trunc:
 268     ND_PRINT((ndo, "[|ipx]"));
 269 }