1/*
2 * Marko Kiiskila carnil@cs.tut.fi
3 *
4 * Tampere University of Technology - Telecommunications Laboratory
5 *
6 * Permission to use, copy, modify and distribute this
7 * software and its documentation is hereby granted,
8 * provided that both the copyright notice and this
9 * permission notice appear in all copies of the software,
10 * derivative works or modified versions, and any portions
11 * thereof, that both notices appear in supporting
12 * documentation, and that the use of this software is
13 * acknowledged in any publications resulting from using
14 * the software.
15 *
16 * TUT ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
17 * CONDITION AND DISCLAIMS ANY LIABILITY OF ANY KIND FOR
18 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS
19 * SOFTWARE.
20 *
21 */
22
23#ifndef lint
24static const char rcsid[] _U_ =
25    "@(#) $Header: /tcpdump/master/tcpdump/print-cip.c,v 1.26 2005-07-07 01:22:17 guy Exp $ (LBL)";
26#endif
27
28#ifdef HAVE_CONFIG_H
29#include "config.h"
30#endif
31
32#include <string.h>
33
34#include <tcpdump-stdinc.h>
35
36#include <stdio.h>
37#include <pcap.h>
38
39#include "interface.h"
40#include "addrtoname.h"
41#include "ethertype.h"
42#include "ether.h"
43
44#define RFC1483LLC_LEN	8
45
46static unsigned char rfcllc[] = {
47	0xaa,	/* DSAP: non-ISO */
48	0xaa,	/* SSAP: non-ISO */
49	0x03,	/* Ctrl: Unnumbered Information Command PDU */
50	0x00,	/* OUI: EtherType */
51	0x00,
52	0x00 };
53
54static inline void
55cip_print(int length)
56{
57	/*
58	 * There is no MAC-layer header, so just print the length.
59	 */
60	printf("%d: ", length);
61}
62
63/*
64 * This is the top level routine of the printer.  'p' points
65 * to the LLC/SNAP or raw header of the packet, 'h->ts' is the timestamp,
66 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
67 * is the number of bytes actually captured.
68 */
69u_int
70cip_if_print(const struct pcap_pkthdr *h, const u_char *p)
71{
72	u_int caplen = h->caplen;
73	u_int length = h->len;
74	u_short extracted_ethertype;
75
76	if (memcmp(rfcllc, p, sizeof(rfcllc))==0 && caplen < RFC1483LLC_LEN) {
77		printf("[|cip]");
78		return (0);
79	}
80
81	if (eflag)
82		cip_print(length);
83
84	if (memcmp(rfcllc, p, sizeof(rfcllc)) == 0) {
85		/*
86		 * LLC header is present.  Try to print it & higher layers.
87		 */
88		if (llc_print(p, length, caplen, NULL, NULL,
89		    &extracted_ethertype) == 0) {
90			/* ether_type not known, print raw packet */
91			if (!eflag)
92				cip_print(length);
93			if (extracted_ethertype) {
94				printf("(LLC %s) ",
95			       etherproto_string(htons(extracted_ethertype)));
96			}
97			if (!suppress_default_print)
98				default_print(p, caplen);
99		}
100	} else {
101		/*
102		 * LLC header is absent; treat it as just IP.
103		 */
104		ip_print(gndo, p, length);
105	}
106
107	return (0);
108}
109
110
111/*
112 * Local Variables:
113 * c-style: whitesmith
114 * c-basic-offset: 8
115 * End:
116 */
117