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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;
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(ndo, 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:
*/
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