/*

* 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.

*/

#define NETDISSECT_REWORKED

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include <tcpdump-stdinc.h>

#include "interface.h"

#include "addrtoname.h"

#include "extract.h"

#define MSDP_TYPE_MAX 7

void

msdp_print(netdissect_options *ndo, const u_char *sp, u_int length)

{

unsigned int type, len;

ND_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 */

ND_PRINT((ndo, " msdp:"));

while (length > 0) {

ND_TCHECK2(*sp, 3);

type = *sp;

len = EXTRACT_16BITS(sp + 1);

if (len > 1400 || ndo->ndo_vflag)

ND_PRINT((ndo, " [len %u]", 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)

ND_PRINT((ndo, " SA"));

else

ND_PRINT((ndo, " SA-Response"));

ND_TCHECK(*sp);

ND_PRINT((ndo, " %u entries", *sp));

if ((u_int)((*sp * 12) + 8) < len) {

ND_PRINT((ndo, " [w/data]"));

if (ndo->ndo_vflag > 1) {

ND_PRINT((ndo, " "));

ip_print(ndo, sp + *sp * 12 + 8 - 3,

len - (*sp * 12 + 8));

}

}

break;

case 2:

ND_PRINT((ndo, " SA-Request"));

ND_TCHECK2(*sp, 5);

ND_PRINT((ndo, " for %s", ipaddr_string(sp + 1)));

break;

case 4:

ND_PRINT((ndo, " Keepalive"));

if (len != 3)

ND_PRINT((ndo, "[len=%d] ", len));

break;

case 5:

ND_PRINT((ndo, " Notification"));

break;

default:

ND_PRINT((ndo, " [type=%d len=%d]", type, len));

break;

}

sp += (len - 3);

length -= (len - 3);

}

return;

trunc:

ND_PRINT((ndo, " [|msdp]"));

}

/*

* Local Variables:

* c-style: whitesmith

* c-basic-offset: 8

* End:

*/