b636d99d91
For now, printing of Sun RPC requests is disabled because we do not yet have the RPC header files. This should affect basically noone, as we do not have any RPC-based programs yet, for the same reason. Change-Id: Ie7818faaaacdc104d8b2c37a68866b4ce18247d6
142 lines
3.9 KiB
C
142 lines
3.9 KiB
C
/*
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* This module implements decoding of the Loopback Protocol, originally
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* defined as the Configuration Testing Protocol. It is based on the following
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* specification:
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* http://www.mit.edu/people/jhawk/ctp.pdf
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*
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* Copyright (c) 2014 The TCPDUMP project
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* 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 the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: print-loopback.c,v 1.2 2014/11/20 03:05:03 christos Exp $");
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#endif
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#define NETDISSECT_REWORKED
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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 <tcpdump-stdinc.h>
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#include "interface.h"
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#include "extract.h"
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#include "ether.h"
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#include "addrtoname.h"
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static const char tstr[] = " [|loopback]";
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static const char cstr[] = " (corrupt)";
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#define LOOPBACK_REPLY 1
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#define LOOPBACK_FWDDATA 2
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static const struct tok fcode_str[] = {
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{ LOOPBACK_REPLY, "Reply" },
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{ LOOPBACK_FWDDATA, "Forward Data" },
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{ 0, NULL }
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};
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static void
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loopback_message_print(netdissect_options *ndo, const u_char *cp, const u_int len)
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{
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const u_char *ep = cp + len;
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uint16_t function;
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if (len < 2)
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goto corrupt;
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/* function */
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ND_TCHECK2(*cp, 2);
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function = EXTRACT_LE_16BITS(cp);
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cp += 2;
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ND_PRINT((ndo, ", %s", tok2str(fcode_str, " invalid (%u)", function)));
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switch (function) {
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case LOOPBACK_REPLY:
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if (len < 4)
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goto corrupt;
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/* receipt number */
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ND_TCHECK2(*cp, 2);
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ND_PRINT((ndo, ", receipt number %u", EXTRACT_LE_16BITS(cp)));
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cp += 2;
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/* data */
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ND_PRINT((ndo, ", data (%u octets)", len - 4));
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ND_TCHECK2(*cp, len - 4);
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break;
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case LOOPBACK_FWDDATA:
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if (len < 8)
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goto corrupt;
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/* forwarding address */
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ND_TCHECK2(*cp, ETHER_ADDR_LEN);
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ND_PRINT((ndo, ", forwarding address %s", etheraddr_string(ndo, cp)));
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cp += ETHER_ADDR_LEN;
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/* data */
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ND_PRINT((ndo, ", data (%u octets)", len - 8));
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ND_TCHECK2(*cp, len - 8);
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break;
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default:
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ND_TCHECK2(*cp, len - 2);
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break;
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}
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return;
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corrupt:
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ND_PRINT((ndo, "%s", cstr));
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ND_TCHECK2(*cp, ep - cp);
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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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void
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loopback_print(netdissect_options *ndo, const u_char *cp, const u_int len)
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{
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const u_char *ep = cp + len;
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uint16_t skipCount;
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ND_PRINT((ndo, "Loopback"));
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if (len < 2)
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goto corrupt;
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/* skipCount */
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ND_TCHECK2(*cp, 2);
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skipCount = EXTRACT_LE_16BITS(cp);
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cp += 2;
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ND_PRINT((ndo, ", skipCount %u", skipCount));
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if (skipCount % 8)
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ND_PRINT((ndo, " (bogus)"));
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if (skipCount > len - 2)
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goto corrupt;
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loopback_message_print(ndo, cp + skipCount, len - 2 - skipCount);
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return;
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corrupt:
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ND_PRINT((ndo, "%s", cstr));
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ND_TCHECK2(*cp, ep - cp);
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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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