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