| /* |
| * Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994 |
| * The Regents of the University of California. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that: (1) source code distributions |
| * retain the above copyright notice and this paragraph in its entirety, (2) |
| * distributions including binary code include the above copyright notice and |
| * this paragraph in its entirety in the documentation or other materials |
| * provided with the distribution, and (3) all advertising materials mentioning |
| * features or use of this software display the following acknowledgement: |
| * ``This product includes software developed by the University of California, |
| * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of |
| * the University nor the names of its contributors may be used to endorse |
| * or promote products derived from this software without specific prior |
| * written permission. |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED |
| * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
| */ |
| |
| /* \summary: IP Payload Compression Protocol (IPComp) printer */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include <config.h> |
| #endif |
| |
| #include "netdissect-stdinc.h" |
| |
| #include "netdissect.h" |
| #include "extract.h" |
| |
| struct ipcomp { |
| nd_uint8_t comp_nxt; /* Next Header */ |
| nd_uint8_t comp_flags; /* Length of data, in 32bit */ |
| nd_uint16_t comp_cpi; /* Compression parameter index */ |
| }; |
| |
| void |
| ipcomp_print(netdissect_options *ndo, const u_char *bp) |
| { |
| const struct ipcomp *ipcomp; |
| uint16_t cpi; |
| |
| ndo->ndo_protocol = "ipcomp"; |
| ipcomp = (const struct ipcomp *)bp; |
| cpi = GET_BE_U_2(ipcomp->comp_cpi); |
| |
| ND_PRINT("IPComp(cpi=0x%04x)", cpi); |
| |
| /* |
| * XXX - based on the CPI, we could decompress the packet here. |
| * Packet buffer management is a headache (if we decompress, |
| * packet will become larger). |
| * |
| * We would decompress the packet and then call a routine that, |
| * based on ipcomp->comp_nxt, dissects the decompressed data. |
| * |
| * Until we do that, however, we just return -1, so that |
| * the loop that processes "protocol"/"next header" types |
| * stops - there's nothing more it can do with a compressed |
| * payload. |
| */ |
| } |