mirror of
https://github.com/the-tcpdump-group/tcpdump.git
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105 lines
2.7 KiB
C
105 lines
2.7 KiB
C
/*
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* Copyright (c) 2001 William C. Fenner.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code
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* distributions retain the above copyright notice and this paragraph
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* in its entirety, and (2) distributions including binary code include
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* the above copyright notice and this paragraph in its entirety in
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* the documentation or other materials provided with the distribution.
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* The name of William C. Fenner may not be used to endorse or
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* promote products derived from this software without specific prior
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* written permission. THIS SOFTWARE IS PROVIDED ``AS IS'' AND
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* WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
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* LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE.
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*/
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/* \summary: Multicast Source Discovery Protocol (MSDP) printer */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <netdissect-stdinc.h>
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#include "netdissect.h"
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#include "addrtoname.h"
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#include "extract.h"
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#define MSDP_TYPE_MAX 7
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void
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msdp_print(netdissect_options *ndo, const u_char *sp, u_int length)
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{
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unsigned int type, len;
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ND_TCHECK_3(sp);
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/* See if we think we're at the beginning of a compound packet */
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type = EXTRACT_U_1(sp);
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len = EXTRACT_BE_U_2(sp + 1);
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if (len > 1500 || len < 3 || type == 0 || type > MSDP_TYPE_MAX)
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goto trunc; /* not really truncated, but still not decodable */
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ND_PRINT(" msdp:");
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while (length > 0) {
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ND_TCHECK_3(sp);
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type = EXTRACT_U_1(sp);
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len = EXTRACT_BE_U_2(sp + 1);
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if (len > 1400 || ndo->ndo_vflag)
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ND_PRINT(" [len %u]", len);
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if (len < 3)
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goto trunc;
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sp += 3;
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length -= 3;
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switch (type) {
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case 1: /* IPv4 Source-Active */
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case 3: /* IPv4 Source-Active Response */
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if (type == 1)
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ND_PRINT(" SA");
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else
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ND_PRINT(" SA-Response");
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ND_TCHECK_1(sp);
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ND_PRINT(" %u entries", EXTRACT_U_1(sp));
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if ((u_int)((EXTRACT_U_1(sp) * 12) + 8) < len) {
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ND_PRINT(" [w/data]");
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if (ndo->ndo_vflag > 1) {
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ND_PRINT(" ");
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ip_print(ndo, sp +
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EXTRACT_U_1(sp) * 12 + 8 - 3,
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len - (EXTRACT_U_1(sp) * 12 + 8));
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}
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}
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break;
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case 2:
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ND_PRINT(" SA-Request");
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ND_TCHECK_5(sp);
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ND_PRINT(" for %s", ipaddr_string(ndo, sp + 1));
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break;
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case 4:
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ND_PRINT(" Keepalive");
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if (len != 3)
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ND_PRINT("[len=%d] ", len);
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break;
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case 5:
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ND_PRINT(" Notification");
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break;
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default:
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ND_PRINT(" [type=%d len=%d]", type, len);
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break;
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}
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sp += (len - 3);
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length -= (len - 3);
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}
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return;
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trunc:
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ND_PRINT(" [|msdp]");
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}
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/*
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* Local Variables:
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* c-style: whitesmith
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* c-basic-offset: 8
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* End:
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*/
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