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128 lines
3.0 KiB
128 lines
3.0 KiB
/* |
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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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#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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