mirror of
https://github.com/the-tcpdump-group/tcpdump.git
synced 2024-12-02 22:43:57 +08:00
109 lines
2.6 KiB
C
109 lines
2.6 KiB
C
/*
|
|
* 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.
|
|
*
|
|
*/
|
|
|
|
#ifndef lint
|
|
static const char rcsid[] _U_ =
|
|
"@(#) $Header: /tcpdump/master/tcpdump/print-cip.c,v 1.24 2004-03-17 23:24:36 guy Exp $ (LBL)";
|
|
#endif
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include <string.h>
|
|
|
|
#include <tcpdump-stdinc.h>
|
|
|
|
#include <stdio.h>
|
|
#include <pcap.h>
|
|
|
|
#include "interface.h"
|
|
#include "addrtoname.h"
|
|
#include "ethertype.h"
|
|
#include "ether.h"
|
|
|
|
#define RFC1483LLC_LEN 8
|
|
|
|
static 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(int length)
|
|
{
|
|
/*
|
|
* There is no MAC-layer header, so just print the length.
|
|
*/
|
|
printf("%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(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) {
|
|
printf("[|cip]");
|
|
return (0);
|
|
}
|
|
|
|
if (eflag)
|
|
cip_print(length);
|
|
|
|
if (memcmp(rfcllc, p, sizeof(rfcllc)) == 0) {
|
|
/*
|
|
* LLC header is present. Try to print it & higher layers.
|
|
*/
|
|
if (llc_print(p, length, caplen, NULL, NULL,
|
|
&extracted_ethertype) == 0) {
|
|
/* ether_type not known, print raw packet */
|
|
if (!eflag)
|
|
cip_print(length);
|
|
if (extracted_ethertype) {
|
|
printf("(LLC %s) ",
|
|
etherproto_string(htons(extracted_ethertype)));
|
|
}
|
|
if (!xflag && !qflag)
|
|
default_print(p, caplen);
|
|
}
|
|
} else {
|
|
/*
|
|
* LLC header is absent; treat it as just IP.
|
|
*/
|
|
ip_print(p, length);
|
|
}
|
|
|
|
return (0);
|
|
}
|