mirror of
https://github.com/the-tcpdump-group/tcpdump.git
synced 2024-11-23 18:14:29 +08:00
424961546a
Apply this to the 4 the recently converted protocols. HOW TO USE: Define this in a print-*.c file before including netdissect.h to make all its ND_TCHECK*() instances longjmp(). Only do this after verifying that every ND_TCHECK*() in the file is correct and that in every possible case it is safe to call longjmp() without incurring resource leaks or any other problems. If it is not safe or feasible to convert whole file, consider converting one function at a time.
136 lines
3.5 KiB
C
136 lines
3.5 KiB
C
/*
|
|
* Copyright (c) 2014 The TCPDUMP project
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
|
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
|
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
/* \summary: Loopback Protocol printer */
|
|
|
|
/*
|
|
* originally defined as the Ethernet Configuration Testing Protocol.
|
|
* specification: https://www.mit.edu/people/jhawk/ctp.pdf
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include <config.h>
|
|
#endif
|
|
|
|
#include "netdissect-stdinc.h"
|
|
|
|
#define ND_LONGJMP_FROM_TCHECK
|
|
#include "netdissect.h"
|
|
#include "extract.h"
|
|
#include "addrtoname.h"
|
|
|
|
|
|
#define LOOPBACK_REPLY 1
|
|
#define LOOPBACK_FWDDATA 2
|
|
|
|
static const struct tok fcode_str[] = {
|
|
{ LOOPBACK_REPLY, "Reply" },
|
|
{ LOOPBACK_FWDDATA, "Forward Data" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static void
|
|
loopback_message_print(netdissect_options *ndo,
|
|
const u_char *cp, u_int len)
|
|
{
|
|
uint16_t function;
|
|
|
|
if (len < 2)
|
|
goto invalid;
|
|
/* function */
|
|
function = GET_LE_U_2(cp);
|
|
cp += 2;
|
|
len -= 2;
|
|
ND_PRINT(", %s", tok2str(fcode_str, " invalid (%u)", function));
|
|
|
|
switch (function) {
|
|
case LOOPBACK_REPLY:
|
|
if (len < 2)
|
|
goto invalid;
|
|
/* receipt number */
|
|
ND_PRINT(", receipt number %u", GET_LE_U_2(cp));
|
|
cp += 2;
|
|
len -= 2;
|
|
/* data */
|
|
ND_PRINT(", data (%u octets)", len);
|
|
ND_TCHECK_LEN(cp, len);
|
|
break;
|
|
case LOOPBACK_FWDDATA:
|
|
if (len < MAC_ADDR_LEN)
|
|
goto invalid;
|
|
/* forwarding address */
|
|
ND_PRINT(", forwarding address %s", GET_ETHERADDR_STRING(cp));
|
|
cp += MAC_ADDR_LEN;
|
|
len -= MAC_ADDR_LEN;
|
|
/* data */
|
|
ND_PRINT(", data (%u octets)", len);
|
|
ND_TCHECK_LEN(cp, len);
|
|
break;
|
|
default:
|
|
ND_TCHECK_LEN(cp, len);
|
|
break;
|
|
}
|
|
return;
|
|
|
|
invalid:
|
|
nd_print_invalid(ndo);
|
|
ND_TCHECK_LEN(cp, len);
|
|
}
|
|
|
|
void
|
|
loopback_print(netdissect_options *ndo,
|
|
const u_char *cp, u_int len)
|
|
{
|
|
uint16_t skipCount;
|
|
|
|
ndo->ndo_protocol = "loopback";
|
|
ND_PRINT("Loopback");
|
|
if (len < 2)
|
|
goto invalid;
|
|
/* skipCount */
|
|
skipCount = GET_LE_U_2(cp);
|
|
cp += 2;
|
|
len -= 2;
|
|
ND_PRINT(", skipCount %u", skipCount);
|
|
if (skipCount % 8)
|
|
ND_PRINT(" (bogus)");
|
|
if (skipCount > len)
|
|
goto invalid;
|
|
/* the octets to skip */
|
|
ND_TCHECK_LEN(cp, skipCount);
|
|
cp += skipCount;
|
|
len -= skipCount;
|
|
/* the first message to decode */
|
|
loopback_message_print(ndo, cp, len);
|
|
return;
|
|
|
|
invalid:
|
|
nd_print_invalid(ndo);
|
|
ND_TCHECK_LEN(cp, len);
|
|
}
|
|
|