mirror of
https://github.com/the-tcpdump-group/tcpdump.git
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02bdfdc471
Use ND_ICHECK_U() in length/type tests and add an 'invalid' label. Remove the 'trunc' label. Move '#define ND_LONGJMP_FROM_TCHECK' just before '#include "netdissect.h"' as for all other uses.
124 lines
3.1 KiB
C
124 lines
3.1 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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#include <config.h>
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#include "netdissect-stdinc.h"
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#define ND_LONGJMP_FROM_TCHECK
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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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ndo->ndo_protocol = "msdp";
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ND_PRINT(": ");
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nd_print_protocol(ndo);
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/* See if we think we're at the beginning of a compound packet */
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type = GET_U_1(sp);
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len = GET_BE_U_2(sp + 1);
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ND_ICHECK_U(len, >, 1500);
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ND_ICHECK_U(len, <, 3);
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ND_ICHECK_U(type, ==, 0);
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ND_ICHECK_U(type, >, MSDP_TYPE_MAX);
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while (length != 0) {
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unsigned int entry_count;
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ND_ICHECK_U(length, <, 3);
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type = GET_U_1(sp);
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len = GET_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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ND_ICHECK_U(len, <, 3);
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ND_ICHECK_U(length, <, len);
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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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/* Entry Count */
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ND_ICHECK_U(len, <, 4);
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entry_count = GET_U_1(sp + 3);
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ND_PRINT(" %u entries", entry_count);
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/* RP Address */
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ND_ICHECK_U(len, <, 8);
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/* XXX -print this based on ndo_vflag? */
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ND_TCHECK_LEN(sp + 4, 4);
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/* Entries */
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ND_TCHECK_LEN(sp + 8, entry_count*12);
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if (len > (8 + entry_count*12)) {
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/* Encapsulated IP packet */
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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 + (8 + entry_count*12),
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len - (8 + entry_count*12));
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}
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}
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break;
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case 2:
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/* draft-ietf-msdp-spec-13 */
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ND_PRINT(" SA-Request");
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/* Reserved */
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ND_ICHECK_U(len, <, 4);
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ND_TCHECK_1(sp + 3);
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/* Group Address */
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ND_ICHECK_U(len, <, 8);
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if (len != 8)
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ND_PRINT("[len=%u] ", len);
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ND_PRINT(" for %s", GET_IPADDR_STRING(sp + 4));
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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=%u] ", 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=%u len=%u]", type, len);
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break;
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}
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ND_TCHECK_LEN(sp, len);
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sp += len;
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length -= len;
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}
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return;
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invalid:
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nd_print_invalid(ndo);
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}
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