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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.
*/
/* \summary: Multicast Source Discovery Protocol (MSDP) printer */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "netdissect-stdinc.h"
#include "netdissect.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;
ndo->ndo_protocol = "msdp";
ND_PRINT(": ");
nd_print_protocol(ndo);
/* See if we think we're at the beginning of a compound packet */
type = GET_U_1(sp);
len = GET_BE_U_2(sp + 1);
if (len > 1500 || len < 3 || type == 0 || type > MSDP_TYPE_MAX)
goto trunc; /* not really truncated, but still not decodable */
while (length != 0) {
type = GET_U_1(sp);
len = GET_BE_U_2(sp + 1);
if (len > 1400 || ndo->ndo_vflag)
ND_PRINT(" [len %u]", len);
if (len < 3)
goto trunc;
if (length < len)
goto trunc;
sp += 3;
length -= 3;
switch (type) {
case 1: /* IPv4 Source-Active */
case 3: /* IPv4 Source-Active Response */
if (type == 1)
ND_PRINT(" SA");
else
ND_PRINT(" SA-Response");
ND_PRINT(" %u entries", GET_U_1(sp));
if ((u_int)((GET_U_1(sp) * 12) + 8) < len) {
ND_PRINT(" [w/data]");
if (ndo->ndo_vflag > 1) {
ND_PRINT(" ");
ip_print(ndo, sp +
GET_U_1(sp) * 12 + 8 - 3,
len - (GET_U_1(sp) * 12 + 8));
}
}
break;
case 2:
ND_PRINT(" SA-Request");
ND_PRINT(" for %s", GET_IPADDR_STRING(sp + 1));
break;
case 4:
ND_PRINT(" Keepalive");
if (len != 3)
ND_PRINT("[len=%u] ", len);
break;
case 5:
ND_PRINT(" Notification");
break;
default:
ND_PRINT(" [type=%u len=%u]", type, len);
break;
}
sp += (len - 3);
length -= (len - 3);
}
return;
trunc:
nd_print_trunc(ndo);
}
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