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/*
* Copyright (c) 2001 William C. Fenner.
* 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, and (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.
* The name of William C. Fenner may not 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.
*/
#ifndef lint
static const char rcsid[] =
"@(#) $Header: /tcpdump/master/tcpdump/print-msdp.c,v 1.2 2001/12/10 08:06:40 guy Exp $";
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <netinet/in.h>
#include "interface.h"
#include "addrtoname.h"
#include "extract.h"
#define MSDP_TYPE_MAX 7
void
msdp_print(const unsigned char *sp, u_int length)
{
unsigned int type, len;
TCHECK2(*sp, 3);
/* See if we think we're at the beginning of a compound packet */
type = *sp;
len = EXTRACT_16BITS(sp + 1);
if (len > 1500 || len < 3 || type == 0 || type > MSDP_TYPE_MAX)
goto trunc; /* not really truncated, but still not decodable */
(void)printf(" msdp:");
while (length > 0) {
TCHECK2(*sp, 3);
type = *sp;
len = EXTRACT_16BITS(sp + 1);
if (len > 1400 || vflag)
printf(" [len %d]", len);
if (len < 3)
goto trunc;
sp += 3;
length -= 3;
switch (type) {
case 1: /* IPv4 Source-Active */
case 3: /* IPv4 Source-Active Response */
if (type == 1)
(void)printf(" SA");
else
(void)printf(" SA-Response");
TCHECK(*sp);
(void)printf(" %d entries", *sp);
if (*sp * 12 + 8 < len) {
(void)printf(" [w/data]");
if (vflag > 1) {
(void)printf(" ");
ip_print(sp + *sp * 12 + 8 - 3,
len - (*sp * 12 + 8));
}
}
break;
case 2:
(void)printf(" SA-Request");
TCHECK2(*sp, 5);
(void)printf(" for %s", ipaddr_string(sp + 1));
break;
case 4:
(void)printf(" Keepalive");
if (len != 3)
(void)printf("[len=%d] ", len);
break;
case 5:
(void)printf(" Notification");
break;
default:
(void)printf(" [type=%d len=%d]", type, len);
break;
}
sp += (len - 3);
length -= (len - 3);
}
return;
trunc:
(void)printf(" [|msdp]");
}
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