mirror of
https://github.com/the-tcpdump-group/tcpdump.git
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129 lines
3.0 KiB
C
129 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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* Dynamic Trunk Protocol (DTP)
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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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#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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static const char tstr[] = " [|dtp]";
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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 TLV"},
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{ DTP_STATUS_TLV, "Status TLV"},
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{ DTP_DTP_TYPE_TLV, "DTP type TLV"},
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{ DTP_NEIGHBOR_TLV, "Neighbor TLV"},
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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 *pptr, u_int length)
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{
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int type, len;
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const u_char *tptr;
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if (length < DTP_HEADER_LEN)
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goto trunc;
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tptr = pptr;
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ND_TCHECK2(*tptr, DTP_HEADER_LEN);
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ND_PRINT((ndo, "DTPv%u, length %u",
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(*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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while (tptr < (pptr+length)) {
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ND_TCHECK2(*tptr, 4);
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type = EXTRACT_16BITS(tptr);
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len = EXTRACT_16BITS(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((ndo, "\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)
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goto invalid;
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ND_TCHECK2(*tptr, len);
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switch (type) {
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case DTP_DOMAIN_TLV:
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ND_PRINT((ndo, ", "));
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fn_printzp(ndo, tptr+4, len-4, pptr+length);
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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((ndo, ", 0x%x", *(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((ndo, ", %s", etheraddr_string(ndo, tptr+4)));
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break;
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default:
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break;
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}
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tptr += len;
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}
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return;
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invalid:
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ND_PRINT((ndo, "%s", istr));
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return;
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trunc:
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ND_PRINT((ndo, "%s", tstr));
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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: 4
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* End:
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*/
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