source: libpacketdump/link_9.c @ 8485d99

4.0.1-hotfixescachetimestampsdevelopdpdk-ndagetsilivendag_formatrc-4.0.1rc-4.0.2rc-4.0.3rc-4.0.4ringdecrementfixringperformanceringtimestampfixes
Last change on this file since 8485d99 was ee6e802, checked in by Shane Alcock <salcock@…>, 5 years ago

Updated copyright blurb on all source files

In some cases, this meant adding copyright blurbs to files that
had never had them before.

  • Property mode set to 100644
File size: 2.1 KB
Line 
1/*
2 *
3 * Copyright (c) 2007-2016 The University of Waikato, Hamilton, New Zealand.
4 * All rights reserved.
5 *
6 * This file is part of libtrace.
7 *
8 * This code has been developed by the University of Waikato WAND
9 * research group. For further information please see http://www.wand.net.nz/
10 *
11 * libtrace is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU Lesser General Public License as published by
13 * the Free Software Foundation; either version 3 of the License, or
14 * (at your option) any later version.
15 *
16 * libtrace is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19 * GNU Lesser General Public License for more details.
20 *
21 * You should have received a copy of the GNU Lesser General Public License
22 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
23 *
24 *
25 */
26/* Decoder for PPP with HDLC frames */
27
28#include <sys/types.h>
29#include <netinet/in.h>
30#include <stdio.h>
31#include <inttypes.h>
32#include <dlfcn.h>
33#include "libtrace.h"
34#include "libpacketdump.h"
35
36typedef struct libtrace_hdlc_t {
37        uint8_t address;        /** Always 0xff */
38        uint8_t control;        /** Always 0x03 */
39        uint16_t protocol;
40} libtrace_hdlc_t;
41
42
43DLLEXPORT void decode(int link_type UNUSED,const char *packet,unsigned len)
44{
45        libtrace_hdlc_t *frame = (libtrace_hdlc_t *)packet;
46
47        printf(" PPP:");
48        if (len >= 1)
49                printf(" Address: 0x%02x", frame->address);
50        else {
51                printf("[|Truncated]\n");
52                return;
53        }
54       
55        if (len >= 2)
56                printf(" Control: 0x%02x", frame->control);
57        else {
58                printf("[|Truncated]\n");
59                return;
60        }
61       
62        if (len >= 4) {
63                printf(" Protocol: 0x%04x\n", ntohs(frame->protocol));
64               
65                /* PPP protocols do not match ethertypes, so we have to
66                 * convert
67                 *
68                 * XXX develop decoders for PPP protocols so this can be
69                 * done generically
70                 */
71                if (ntohs(frame->protocol) == 0x0021) {
72                        decode_next(packet + 4, len - 4, "eth", 0x0800);
73                } 
74        }
75        else {
76                printf("[|Truncated]\n");
77                return;
78        }
79       
80
81        return;
82}
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