mirror of
https://github.com/the-tcpdump-group/tcpdump.git
synced 2024-11-27 12:03:44 +08:00
51e180c4fb
Remove a number of instances that do not match common patterns and have the only substantial effect on the code flow that a truncated packet triggers "goto trunc" instead of longjmp(). (In a few cases this change can increase the number of fields printed before giving up.)
266 lines
6.7 KiB
C
266 lines
6.7 KiB
C
/*
|
|
* 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.
|
|
*
|
|
* Contributed by Brad Parker (brad@fcr.com).
|
|
*/
|
|
|
|
/* \summary: Novell IPX printer */
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include <config.h>
|
|
#endif
|
|
|
|
#include "netdissect-stdinc.h"
|
|
|
|
#include <stdio.h>
|
|
|
|
#include "netdissect.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 {
|
|
nd_uint16_t cksum; /* Checksum */
|
|
nd_uint16_t length; /* Length, in bytes, including header */
|
|
nd_uint8_t tCtl; /* Transport Control (i.e. hop count) */
|
|
nd_uint8_t pType; /* Packet Type (i.e. level 2 protocol) */
|
|
nd_uint32_t dstNet; /* destination net */
|
|
nd_byte dstNode[6]; /* destination node */
|
|
nd_uint16_t dstSkt; /* destination socket */
|
|
nd_uint32_t srcNet; /* source net */
|
|
nd_byte srcNode[6]; /* source node */
|
|
nd_uint16_t srcSkt; /* source socket */
|
|
};
|
|
|
|
#define ipxSize 30
|
|
|
|
static const char *ipxaddr_string(netdissect_options *, 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_char *, u_int);
|
|
static void ipx_rip_print(netdissect_options *, const u_char *, 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;
|
|
|
|
ndo->ndo_protocol = "ipx";
|
|
if (!ndo->ndo_eflag)
|
|
ND_PRINT("IPX ");
|
|
|
|
ND_PRINT("%s.%04x > ",
|
|
ipxaddr_string(ndo, GET_BE_U_4(ipx->srcNet), ipx->srcNode),
|
|
GET_BE_U_2(ipx->srcSkt));
|
|
|
|
ND_PRINT("%s.%04x: ",
|
|
ipxaddr_string(ndo, GET_BE_U_4(ipx->dstNet), ipx->dstNode),
|
|
GET_BE_U_2(ipx->dstSkt));
|
|
|
|
/* take length from ipx header */
|
|
length = GET_BE_U_2(ipx->length);
|
|
|
|
if (length < ipxSize) {
|
|
ND_PRINT("[length %u < %u]", length, ipxSize);
|
|
nd_print_invalid(ndo);
|
|
return;
|
|
}
|
|
ipx_decode(ndo, ipx, p + ipxSize, length - ipxSize);
|
|
}
|
|
|
|
static const char *
|
|
ipxaddr_string(netdissect_options *ndo, uint32_t net, const u_char *node)
|
|
{
|
|
static char line[256];
|
|
|
|
snprintf(line, sizeof(line), "%08x.%02x:%02x:%02x:%02x:%02x:%02x",
|
|
net, GET_U_1(node), GET_U_1(node + 1),
|
|
GET_U_1(node + 2), GET_U_1(node + 3),
|
|
GET_U_1(node + 4), GET_U_1(node + 5));
|
|
|
|
return line;
|
|
}
|
|
|
|
static void
|
|
ipx_decode(netdissect_options *ndo, const struct ipxHdr *ipx, const u_char *datap, u_int length)
|
|
{
|
|
u_short dstSkt;
|
|
|
|
dstSkt = GET_BE_U_2(ipx->dstSkt);
|
|
switch (dstSkt) {
|
|
case IPX_SKT_NCP:
|
|
ND_PRINT("ipx-ncp %u", length);
|
|
break;
|
|
case IPX_SKT_SAP:
|
|
ipx_sap_print(ndo, datap, length);
|
|
break;
|
|
case IPX_SKT_RIP:
|
|
ipx_rip_print(ndo, datap, length);
|
|
break;
|
|
case IPX_SKT_NETBIOS:
|
|
ND_PRINT("ipx-netbios %u", length);
|
|
#ifdef ENABLE_SMB
|
|
ipx_netbios_print(ndo, datap, length);
|
|
#endif
|
|
break;
|
|
case IPX_SKT_DIAGNOSTICS:
|
|
ND_PRINT("ipx-diags %u", length);
|
|
break;
|
|
case IPX_SKT_NWLINK_DGM:
|
|
ND_PRINT("ipx-nwlink-dgm %u", length);
|
|
#ifdef ENABLE_SMB
|
|
ipx_netbios_print(ndo, datap, length);
|
|
#endif
|
|
break;
|
|
case IPX_SKT_EIGRP:
|
|
eigrp_print(ndo, datap, length);
|
|
break;
|
|
default:
|
|
ND_PRINT("ipx-#%x %u", dstSkt, length);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
ipx_sap_print(netdissect_options *ndo, const u_char *ipx, u_int length)
|
|
{
|
|
int command, i;
|
|
|
|
command = GET_BE_U_2(ipx);
|
|
ipx += 2;
|
|
length -= 2;
|
|
|
|
switch (command) {
|
|
case 1:
|
|
case 3:
|
|
if (command == 1)
|
|
ND_PRINT("ipx-sap-req");
|
|
else
|
|
ND_PRINT("ipx-sap-nearest-req");
|
|
|
|
ND_PRINT(" %s", ipxsap_string(ndo, htons(GET_BE_U_2(ipx))));
|
|
break;
|
|
|
|
case 2:
|
|
case 4:
|
|
if (command == 2)
|
|
ND_PRINT("ipx-sap-resp");
|
|
else
|
|
ND_PRINT("ipx-sap-nearest-resp");
|
|
|
|
for (i = 0; i < 8 && length != 0; i++) {
|
|
ND_TCHECK_2(ipx);
|
|
if (length < 2)
|
|
goto trunc;
|
|
ND_PRINT(" %s '", ipxsap_string(ndo, htons(GET_BE_U_2(ipx))));
|
|
ipx += 2;
|
|
length -= 2;
|
|
if (length < 48) {
|
|
ND_PRINT("'");
|
|
goto trunc;
|
|
}
|
|
if (nd_printzp(ndo, ipx, 48, ndo->ndo_snapend)) {
|
|
ND_PRINT("'");
|
|
goto trunc;
|
|
}
|
|
ND_PRINT("'");
|
|
ipx += 48;
|
|
length -= 48;
|
|
/*
|
|
* 10 bytes of IPX address.
|
|
*/
|
|
ND_TCHECK_LEN(ipx, 10);
|
|
if (length < 10)
|
|
goto trunc;
|
|
ND_PRINT(" addr %s",
|
|
ipxaddr_string(ndo, GET_BE_U_4(ipx), ipx + 4));
|
|
ipx += 10;
|
|
length -= 10;
|
|
/*
|
|
* 2 bytes of socket and 2 bytes of number of intermediate
|
|
* networks.
|
|
*/
|
|
ND_TCHECK_4(ipx);
|
|
if (length < 4)
|
|
goto trunc;
|
|
ipx += 4;
|
|
length -= 4;
|
|
}
|
|
break;
|
|
default:
|
|
ND_PRINT("ipx-sap-?%x", command);
|
|
break;
|
|
}
|
|
return;
|
|
trunc:
|
|
nd_print_trunc(ndo);
|
|
}
|
|
|
|
static void
|
|
ipx_rip_print(netdissect_options *ndo, const u_char *ipx, u_int length)
|
|
{
|
|
int command, i;
|
|
|
|
command = GET_BE_U_2(ipx);
|
|
ipx += 2;
|
|
length -= 2;
|
|
|
|
switch (command) {
|
|
case 1:
|
|
ND_PRINT("ipx-rip-req");
|
|
if (length != 0) {
|
|
if (length < 8)
|
|
goto trunc;
|
|
ND_PRINT(" %08x/%u.%u", GET_BE_U_4(ipx),
|
|
GET_BE_U_2(ipx + 4), GET_BE_U_2(ipx + 6));
|
|
}
|
|
break;
|
|
case 2:
|
|
ND_PRINT("ipx-rip-resp");
|
|
for (i = 0; i < 50 && length != 0; i++) {
|
|
if (length < 8)
|
|
goto trunc;
|
|
ND_PRINT(" %08x/%u.%u", GET_BE_U_4(ipx),
|
|
GET_BE_U_2(ipx + 4), GET_BE_U_2(ipx + 6));
|
|
|
|
ipx += 8;
|
|
length -= 8;
|
|
}
|
|
break;
|
|
default:
|
|
ND_PRINT("ipx-rip-?%x", command);
|
|
break;
|
|
}
|
|
return;
|
|
trunc:
|
|
nd_print_trunc(ndo);
|
|
}
|