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https://github.com/the-tcpdump-group/tcpdump.git
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70 lines
2.3 KiB
C
70 lines
2.3 KiB
C
/*
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* Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994
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* The Regents of the University of California. 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 distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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/* \summary: IP Payload Compression Protocol (IPComp) 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 "extract.h"
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struct ipcomp {
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nd_uint8_t comp_nxt; /* Next Header */
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nd_uint8_t comp_flags; /* Length of data, in 32bit */
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nd_uint16_t comp_cpi; /* Compression parameter index */
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};
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void
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ipcomp_print(netdissect_options *ndo, const u_char *bp)
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{
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const struct ipcomp *ipcomp;
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uint16_t cpi;
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ipcomp = (const struct ipcomp *)bp;
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ND_TCHECK_SIZE(ipcomp);
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cpi = EXTRACT_BE_U_2(ipcomp->comp_cpi);
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ND_PRINT("IPComp(cpi=0x%04x)", cpi);
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/*
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* XXX - based on the CPI, we could decompress the packet here.
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* Packet buffer management is a headache (if we decompress,
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* packet will become larger).
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*
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* We would decompress the packet and then call a routine that,
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* based on ipcomp->comp_nxt, dissects the decompressed data.
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*
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* Until we do that, however, we just return -1, so that
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* the loop that processes "protocol"/"next header" types
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* stops - there's nothing more it can do with a compressed
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* payload.
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*/
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return;
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trunc:
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ND_PRINT("[|IPCOMP]");
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return;
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}
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