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https://github.com/the-tcpdump-group/tcpdump.git
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94a3708f00
Builds using Autotools or CMake generate config.h, thus remove the '#ifdef HAVE_CONFIG_H'/'#endif'. Remove also the 'add_definitions(-DHAVE_CONFIG_H)' in CMakeLists.txt.
121 lines
3.0 KiB
C
121 lines
3.0 KiB
C
/*
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* Copyright (c) 1998-2007 The TCPDUMP project
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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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* 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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* Original code by Carles Kishimoto <carles.kishimoto@gmail.com>
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*/
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/* \summary: Dynamic Trunking Protocol (DTP) 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 DTP_HEADER_LEN 1
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#define DTP_DOMAIN_TLV 0x0001
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#define DTP_STATUS_TLV 0x0002
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#define DTP_DTP_TYPE_TLV 0x0003
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#define DTP_NEIGHBOR_TLV 0x0004
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static const struct tok dtp_tlv_values[] = {
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{ DTP_DOMAIN_TLV, "Domain" },
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{ DTP_STATUS_TLV, "Status" },
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{ DTP_DTP_TYPE_TLV, "DTP type" },
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{ DTP_NEIGHBOR_TLV, "Neighbor" },
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{ 0, NULL}
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};
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void
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dtp_print(netdissect_options *ndo, const u_char *tptr, u_int length)
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{
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ndo->ndo_protocol = "dtp";
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if (length < DTP_HEADER_LEN) {
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ND_PRINT("[zero packet length]");
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goto invalid;
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}
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ND_PRINT("DTPv%u, length %u",
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GET_U_1(tptr),
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length);
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/*
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* In non-verbose mode, just print version.
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*/
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if (ndo->ndo_vflag < 1) {
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return;
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}
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tptr += DTP_HEADER_LEN;
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length -= DTP_HEADER_LEN;
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while (length) {
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uint16_t type, len;
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if (length < 4) {
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ND_PRINT("[%u bytes remaining]", length);
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goto invalid;
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}
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type = GET_BE_U_2(tptr);
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len = GET_BE_U_2(tptr + 2);
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/* XXX: should not be but sometimes it is, see the test captures */
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if (type == 0)
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return;
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ND_PRINT("\n\t%s (0x%04x) TLV, length %u",
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tok2str(dtp_tlv_values, "Unknown", type),
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type, len);
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/* infinite loop check */
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if (len < 4 || len > length) {
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ND_PRINT("[TLV length %u]", len);
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goto invalid;
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}
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switch (type) {
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case DTP_DOMAIN_TLV:
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ND_PRINT(", ");
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nd_printjnp(ndo, tptr+4, len-4);
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break;
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case DTP_STATUS_TLV:
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case DTP_DTP_TYPE_TLV:
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if (len != 5)
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goto invalid;
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ND_PRINT(", 0x%x", GET_U_1(tptr + 4));
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break;
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case DTP_NEIGHBOR_TLV:
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if (len != 10)
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goto invalid;
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ND_PRINT(", %s", GET_MAC48_STRING(tptr+4));
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break;
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default:
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ND_TCHECK_LEN(tptr, len);
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break;
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}
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tptr += 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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ND_TCHECK_LEN(tptr, length);
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}
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