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https://github.com/the-tcpdump-group/tcpdump.git
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4bec97f457
tcpdump.c. Have if_print routines return the length of the link-layer header, so that the common code knows how to skip the link-layer header when printing the packet in hex/ASCII.
109 lines
2.6 KiB
C
109 lines
2.6 KiB
C
/*
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* Marko Kiiskila carnil@cs.tut.fi
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*
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* Tampere University of Technology - Telecommunications Laboratory
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*
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* Permission to use, copy, modify and distribute this
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* software and its documentation is hereby granted,
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* provided that both the copyright notice and this
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* permission notice appear in all copies of the software,
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* derivative works or modified versions, and any portions
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* thereof, that both notices appear in supporting
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* documentation, and that the use of this software is
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* acknowledged in any publications resulting from using
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* the software.
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*
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* TUT ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION AND DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS
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* SOFTWARE.
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*
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*/
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#ifndef lint
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static const char rcsid[] =
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"@(#) $Header: /tcpdump/master/tcpdump/print-cip.c,v 1.21 2002-12-19 09:39:12 guy Exp $ (LBL)";
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#endif
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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 <string.h>
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#include <tcpdump-stdinc.h>
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#include <stdio.h>
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#include <pcap.h>
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#include "interface.h"
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#include "addrtoname.h"
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#include "ethertype.h"
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#include "ether.h"
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#define RFC1483LLC_LEN 8
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static unsigned char rfcllc[] = {
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0xaa, /* DSAP: non-ISO */
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0xaa, /* SSAP: non-ISO */
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0x03, /* Ctrl: Unnumbered Information Command PDU */
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0x00, /* OUI: EtherType */
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0x00,
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0x00 };
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static inline void
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cip_print(int length)
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{
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/*
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* There is no MAC-layer header, so just print the length.
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*/
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printf("%d: ", length);
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}
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/*
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* This is the top level routine of the printer. 'p' points
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* to the LLC/SNAP or raw header of the packet, 'h->ts' is the timestamp,
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* 'h->length' is the length of the packet off the wire, and 'h->caplen'
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* is the number of bytes actually captured.
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*/
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u_int
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cip_if_print(const struct pcap_pkthdr *h, const u_char *p)
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{
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u_int caplen = h->caplen;
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u_int length = h->len;
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u_short extracted_ethertype;
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if (memcmp(rfcllc, p, sizeof(rfcllc))==0 && caplen < RFC1483LLC_LEN) {
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printf("[|cip]");
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return (0);
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}
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if (eflag)
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cip_print(length);
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if (memcmp(rfcllc, p, sizeof(rfcllc)) == 0) {
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/*
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* LLC header is present. Try to print it & higher layers.
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*/
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if (llc_print(p, length, caplen, NULL, NULL,
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&extracted_ethertype) == 0) {
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/* ether_type not known, print raw packet */
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if (!eflag)
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cip_print(length);
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if (extracted_ethertype) {
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printf("(LLC %s) ",
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etherproto_string(htons(extracted_ethertype)));
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}
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if (!xflag && !qflag)
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default_print(p, caplen);
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}
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} else {
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/*
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* LLC header is absent; treat it as just IP.
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*/
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ip_print(p, length);
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}
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return (0);
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}
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