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  * Format and print Novell IPX packets.
  22  * Contributed by Brad Parker (brad@fcr.com).
  23  */
  24
  25 /* \summary: Novell IPX printer */
  26
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #include <netdissect-stdinc.h>
  32
  33 #include <stdio.h>
  34
  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     uint16_t    cksum;          /* Checksum */
  51     uint16_t    length;         /* Length, in bytes, including header */
  52     uint8_t     tCtl;           /* Transport Control (i.e. hop count) */
  53     uint8_t     pType;          /* Packet Type (i.e. level 2 protocol) */
  54     uint16_t    dstNet[2];      /* destination net */
  55     uint8_t     dstNode[6];     /* destination node */
  56     uint16_t    dstSkt;         /* destination socket */
  57     uint16_t    srcNet[2];      /* source net */
  58     uint8_t     srcNode[6];     /* source node */
  59     uint16_t    srcSkt;         /* source socket */
  60 };
  61
  62 #define ipxSize 30
  63
  64 static const char *ipxaddr_string(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_short *, u_int);
  67 static void ipx_rip_print(netdissect_options *, const u_short *, 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         if (!ndo->ndo_eflag)
  78                 ND_PRINT((ndo, "IPX "));
  79
  80         ND_TCHECK(ipx->srcSkt);
  81         ND_PRINT((ndo, "%s.%04x > ",
  82                      ipxaddr_string(EXTRACT_32BITS(ipx->srcNet), ipx->srcNode),
  83                      EXTRACT_16BITS(&ipx->srcSkt)));
  84
  85         ND_PRINT((ndo, "%s.%04x: ",
  86                      ipxaddr_string(EXTRACT_32BITS(ipx->dstNet), ipx->dstNode),
  87                      EXTRACT_16BITS(&ipx->dstSkt)));
  88
  89         /* take length from ipx header */
  90         ND_TCHECK(ipx->length);
  91         length = EXTRACT_16BITS(&ipx->length);
  92
  93         ipx_decode(ndo, ipx, p + ipxSize, length - ipxSize);
  94         return;
  95 trunc:
  96         ND_PRINT((ndo, "[|ipx %d]", length));
  97 }
  98
  99 static const char *
 100 ipxaddr_string(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, node[0], node[1], node[2], node[3], node[4], node[5]);
 106
 107     return line;
 108 }
 109
 110 static void
 111 ipx_decode(netdissect_options *ndo, const struct ipxHdr *ipx, const u_char *datap, u_int length)
 112 {
 113     register u_short dstSkt;
 114
 115     dstSkt = EXTRACT_16BITS(&ipx->dstSkt);
 116     switch (dstSkt) {
 117       case IPX_SKT_NCP:
 118         ND_PRINT((ndo, "ipx-ncp %d", length));
 119         break;
 120       case IPX_SKT_SAP:
 121         ipx_sap_print(ndo, (const u_short *)datap, length);
 122         break;
 123       case IPX_SKT_RIP:
 124         ipx_rip_print(ndo, (const u_short *)datap, length);
 125         break;
 126       case IPX_SKT_NETBIOS:
 127         ND_PRINT((ndo, "ipx-netbios %d", length));
 128 #ifdef ENABLE_SMB
 129         ipx_netbios_print(ndo, datap, length);
 130 #endif
 131         break;
 132       case IPX_SKT_DIAGNOSTICS:
 133         ND_PRINT((ndo, "ipx-diags %d", length));
 134         break;
 135       case IPX_SKT_NWLINK_DGM:
 136         ND_PRINT((ndo, "ipx-nwlink-dgm %d", length));
 137 #ifdef ENABLE_SMB
 138         ipx_netbios_print(ndo, datap, length);
 139 #endif
 140         break;
 141       case IPX_SKT_EIGRP:
 142         eigrp_print(ndo, datap, length);
 143         break;
 144       default:
 145         ND_PRINT((ndo, "ipx-#%x %d", dstSkt, length));
 146         break;
 147     }
 148 }
 149
 150 static void
 151 ipx_sap_print(netdissect_options *ndo, const u_short *ipx, u_int length)
 152 {
 153     int command, i;
 154
 155     ND_TCHECK(ipx[0]);
 156     command = EXTRACT_16BITS(ipx);
 157     ipx++;
 158     length -= 2;
 159
 160     switch (command) {
 161       case 1:
 162       case 3:
 163         if (command == 1)
 164             ND_PRINT((ndo, "ipx-sap-req"));
 165         else
 166             ND_PRINT((ndo, "ipx-sap-nearest-req"));
 167
 168         ND_TCHECK(ipx[0]);
 169         ND_PRINT((ndo, " %s", ipxsap_string(ndo, htons(EXTRACT_16BITS(&ipx[0])))));
 170         break;
 171
 172       case 2:
 173       case 4:
 174         if (command == 2)
 175             ND_PRINT((ndo, "ipx-sap-resp"));
 176         else
 177             ND_PRINT((ndo, "ipx-sap-nearest-resp"));
 178
 179         for (i = 0; i < 8 && length > 0; i++) {
 180             ND_TCHECK(ipx[0]);
 181             ND_PRINT((ndo, " %s '", ipxsap_string(ndo, htons(EXTRACT_16BITS(&ipx[0])))));
 182             if (fn_printzp(ndo, (const u_char *)&ipx[1], 48, ndo->ndo_snapend)) {
 183                 ND_PRINT((ndo, "'"));
 184                 goto trunc;
 185             }
 186             ND_TCHECK2(ipx[25], 10);
 187             ND_PRINT((ndo, "' addr %s",
 188                 ipxaddr_string(EXTRACT_32BITS(&ipx[25]), (const u_char *)&ipx[27])));
 189             ipx += 32;
 190             length -= 64;
 191         }
 192         break;
 193       default:
 194         ND_PRINT((ndo, "ipx-sap-?%x", command));
 195         break;
 196     }
 197     return;
 198 trunc:
 199     ND_PRINT((ndo, "[|ipx %d]", length));
 200 }
 201
 202 static void
 203 ipx_rip_print(netdissect_options *ndo, const u_short *ipx, u_int length)
 204 {
 205     int command, i;
 206
 207     ND_TCHECK(ipx[0]);
 208     command = EXTRACT_16BITS(ipx);
 209     ipx++;
 210     length -= 2;
 211
 212     switch (command) {
 213       case 1:
 214         ND_PRINT((ndo, "ipx-rip-req"));
 215         if (length > 0) {
 216             ND_TCHECK(ipx[3]);
 217             ND_PRINT((ndo, " %08x/%d.%d", EXTRACT_32BITS(&ipx[0]),
 218                          EXTRACT_16BITS(&ipx[2]), EXTRACT_16BITS(&ipx[3])));
 219         }
 220         break;
 221       case 2:
 222         ND_PRINT((ndo, "ipx-rip-resp"));
 223         for (i = 0; i < 50 && length > 0; i++) {
 224             ND_TCHECK(ipx[3]);
 225             ND_PRINT((ndo, " %08x/%d.%d", EXTRACT_32BITS(&ipx[0]),
 226                          EXTRACT_16BITS(&ipx[2]), EXTRACT_16BITS(&ipx[3])));
 227
 228             ipx += 4;
 229             length -= 8;
 230         }
 231         break;
 232       default:
 233         ND_PRINT((ndo, "ipx-rip-?%x", command));
 234         break;
 235     }
 236     return;
 237 trunc:
 238     ND_PRINT((ndo, "[|ipx %d]", length));
 239 }