nexmon – Rev 1
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/*
* Copyright (c) 1994, 1995, 1996
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific prior
* written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* Format and print Novell IPX packets.
* Contributed by Brad Parker (brad@fcr.com).
*/
#define NETDISSECT_REWORKED
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <tcpdump-stdinc.h>
#include <stdio.h>
#include "interface.h"
#include "addrtoname.h"
#include "extract.h"
/* well-known sockets */
#define IPX_SKT_NCP 0x0451
#define IPX_SKT_SAP 0x0452
#define IPX_SKT_RIP 0x0453
#define IPX_SKT_NETBIOS 0x0455
#define IPX_SKT_DIAGNOSTICS 0x0456
#define IPX_SKT_NWLINK_DGM 0x0553 /* NWLink datagram, may contain SMB */
#define IPX_SKT_EIGRP 0x85be /* Cisco EIGRP over IPX */
/* IPX transport header */
struct ipxHdr {
uint16_t cksum; /* Checksum */
uint16_t length; /* Length, in bytes, including header */
uint8_t tCtl; /* Transport Control (i.e. hop count) */
uint8_t pType; /* Packet Type (i.e. level 2 protocol) */
uint16_t dstNet[2]; /* destination net */
uint8_t dstNode[6]; /* destination node */
uint16_t dstSkt; /* destination socket */
uint16_t srcNet[2]; /* source net */
uint8_t srcNode[6]; /* source node */
uint16_t srcSkt; /* source socket */
};
#define ipxSize 30
static const char *ipxaddr_string(uint32_t, const u_char *);
static void ipx_decode(netdissect_options *, const struct ipxHdr *, const u_char *, u_int);
static void ipx_sap_print(netdissect_options *, const u_short *, u_int);
static void ipx_rip_print(netdissect_options *, const u_short *, u_int);
/*
* Print IPX datagram packets.
*/
void
ipx_print(netdissect_options *ndo, const u_char *p, u_int length)
{
const struct ipxHdr *ipx = (const struct ipxHdr *)p;
if (!ndo->ndo_eflag)
ND_PRINT((ndo, "IPX "));
ND_TCHECK(ipx->srcSkt);
ND_PRINT((ndo, "%s.%04x > ",
ipxaddr_string(EXTRACT_32BITS(ipx->srcNet), ipx->srcNode),
EXTRACT_16BITS(&ipx->srcSkt)));
ND_PRINT((ndo, "%s.%04x: ",
ipxaddr_string(EXTRACT_32BITS(ipx->dstNet), ipx->dstNode),
EXTRACT_16BITS(&ipx->dstSkt)));
/* take length from ipx header */
ND_TCHECK(ipx->length);
length = EXTRACT_16BITS(&ipx->length);
ipx_decode(ndo, ipx, (u_char *)ipx + ipxSize, length - ipxSize);
return;
trunc:
ND_PRINT((ndo, "[|ipx %d]", length));
}
static const char *
ipxaddr_string(uint32_t net, const u_char *node)
{
static char line[256];
snprintf(line, sizeof(line), "%08x.%02x:%02x:%02x:%02x:%02x:%02x",
net, node[0], node[1], node[2], node[3], node[4], node[5]);
return line;
}
static void
ipx_decode(netdissect_options *ndo, const struct ipxHdr *ipx, const u_char *datap, u_int length)
{
register u_short dstSkt;
dstSkt = EXTRACT_16BITS(&ipx->dstSkt);
switch (dstSkt) {
case IPX_SKT_NCP:
ND_PRINT((ndo, "ipx-ncp %d", length));
break;
case IPX_SKT_SAP:
ipx_sap_print(ndo, (u_short *)datap, length);
break;
case IPX_SKT_RIP:
ipx_rip_print(ndo, (u_short *)datap, length);
break;
case IPX_SKT_NETBIOS:
ND_PRINT((ndo, "ipx-netbios %d", length));
#ifdef TCPDUMP_DO_SMB
ipx_netbios_print(ndo, datap, length);
#endif
break;
case IPX_SKT_DIAGNOSTICS:
ND_PRINT((ndo, "ipx-diags %d", length));
break;
case IPX_SKT_NWLINK_DGM:
ND_PRINT((ndo, "ipx-nwlink-dgm %d", length));
#ifdef TCPDUMP_DO_SMB
ipx_netbios_print(ndo, datap, length);
#endif
break;
case IPX_SKT_EIGRP:
eigrp_print(ndo, datap, length);
break;
default:
ND_PRINT((ndo, "ipx-#%x %d", dstSkt, length));
break;
}
}
static void
ipx_sap_print(netdissect_options *ndo, const u_short *ipx, u_int length)
{
int command, i;
ND_TCHECK(ipx[0]);
command = EXTRACT_16BITS(ipx);
ipx++;
length -= 2;
switch (command) {
case 1:
case 3:
if (command == 1)
ND_PRINT((ndo, "ipx-sap-req"));
else
ND_PRINT((ndo, "ipx-sap-nearest-req"));
ND_TCHECK(ipx[0]);
ND_PRINT((ndo, " %s", ipxsap_string(htons(EXTRACT_16BITS(&ipx[0])))));
break;
case 2:
case 4:
if (command == 2)
ND_PRINT((ndo, "ipx-sap-resp"));
else
ND_PRINT((ndo, "ipx-sap-nearest-resp"));
for (i = 0; i < 8 && length > 0; i++) {
ND_TCHECK(ipx[0]);
ND_PRINT((ndo, " %s '", ipxsap_string(htons(EXTRACT_16BITS(&ipx[0])))));
if (fn_printzp(ndo, (u_char *)&ipx[1], 48, ndo->ndo_snapend)) {
ND_PRINT((ndo, "'"));
goto trunc;
}
ND_TCHECK2(ipx[25], 10);
ND_PRINT((ndo, "' addr %s",
ipxaddr_string(EXTRACT_32BITS(&ipx[25]), (u_char *)&ipx[27])));
ipx += 32;
length -= 64;
}
break;
default:
ND_PRINT((ndo, "ipx-sap-?%x", command));
break;
}
return;
trunc:
ND_PRINT((ndo, "[|ipx %d]", length));
}
static void
ipx_rip_print(netdissect_options *ndo, const u_short *ipx, u_int length)
{
int command, i;
ND_TCHECK(ipx[0]);
command = EXTRACT_16BITS(ipx);
ipx++;
length -= 2;
switch (command) {
case 1:
ND_PRINT((ndo, "ipx-rip-req"));
if (length > 0) {
ND_TCHECK(ipx[3]);
ND_PRINT((ndo, " %08x/%d.%d", EXTRACT_32BITS(&ipx[0]),
EXTRACT_16BITS(&ipx[2]), EXTRACT_16BITS(&ipx[3])));
}
break;
case 2:
ND_PRINT((ndo, "ipx-rip-resp"));
for (i = 0; i < 50 && length > 0; i++) {
ND_TCHECK(ipx[3]);
ND_PRINT((ndo, " %08x/%d.%d", EXTRACT_32BITS(&ipx[0]),
EXTRACT_16BITS(&ipx[2]), EXTRACT_16BITS(&ipx[3])));
ipx += 4;
length -= 8;
}
break;
default:
ND_PRINT((ndo, "ipx-rip-?%x", command));
break;
}
return;
trunc:
ND_PRINT((ndo, "[|ipx %d]", length));
}