mirror of
https://github.com/the-tcpdump-group/tcpdump.git
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d8acd8f5d0
For each decoder that has more than one instance of truncation signaling
and prints the same string in each instance make sure that the string is
declared as "static const char tstr[]" right after the initial includes
block. Where necessary, replace fputs(s, stdout) with equivalent
printf("%s", s).
119 lines
3.7 KiB
C
119 lines
3.7 KiB
C
/*
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* This module implements printing of the very basic (version-independent)
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* OpenFlow header and iteration over OpenFlow messages. It is intended for
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* dispatching of version-specific OpenFlow message decoding.
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*
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*
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* Copyright (c) 2013 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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#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 "openflow.h"
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static const char tstr[] = " [|openflow]";
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static const char cstr[] = " (corrupt)";
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#define OF_VER_1_0 0x01
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static void
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of_header_print(const uint8_t version, const uint8_t type,
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const uint16_t length, const uint32_t xid) {
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printf("\n\tversion unknown (0x%02x), type 0x%02x, length %u, xid 0x%08x",
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version, type, length, xid);
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}
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/* Print a single OpenFlow message. */
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static const u_char *
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of_header_body_print(const u_char *cp, const u_char *ep) {
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uint8_t version, type;
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uint16_t length;
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uint32_t xid;
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if (ep < cp + OF_HEADER_LEN)
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goto corrupt;
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/* version */
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TCHECK2(*cp, 1);
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version = *cp;
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cp += 1;
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/* type */
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TCHECK2(*cp, 1);
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type = *cp;
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cp += 1;
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/* length */
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TCHECK2(*cp, 2);
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length = EXTRACT_16BITS(cp);
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cp += 2;
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/* xid */
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TCHECK2(*cp, 4);
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xid = EXTRACT_32BITS(cp);
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cp += 4;
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/* Message length includes the header length and a message always includes
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* the basic header. A message length underrun fails decoding of the rest of
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* the current packet. At the same time, try decoding as much of the current
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* message as possible even when it does not end within the current TCP
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* segment. */
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if (length < OF_HEADER_LEN) {
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of_header_print(version, type, length, xid);
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goto corrupt;
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}
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/* Decode known protocol versions further without printing the header (the
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* type decoding is version-specific. */
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switch (version) {
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case OF_VER_1_0:
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return of10_header_body_print(cp, ep, type, length, xid);
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default:
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of_header_print(version, type, length, xid);
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TCHECK2(*cp, length - OF_HEADER_LEN);
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return cp + length - OF_HEADER_LEN; /* done with current message */
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}
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corrupt: /* fail current packet */
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printf("%s", cstr);
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TCHECK2(*cp, ep - cp);
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return ep;
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trunc:
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printf("%s", tstr);
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return ep;
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}
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/* Print a TCP segment worth of OpenFlow messages presuming the segment begins
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* on a message boundary. */
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void
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openflow_print(const u_char *cp, const u_int len) {
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const u_char *ep = cp + len;
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printf(": OpenFlow");
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while (cp < ep)
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cp = of_header_body_print(cp, ep);
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}
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