mirror of
https://github.com/the-tcpdump-group/tcpdump.git
synced 2024-11-24 02:23:27 +08:00
e070cf232f
dissector really needs source and destination MAC addresses, we should make global pointers to them - which would be null for packets lacking MAC addresses, so dissectors that need them will need to do something sensible if those pointers are null.) Don't fake up an Ethernet header if there aren't any MAC addresses to use when faking it up. "bp_chaddr" in "print-bootp.c" is an array, so "bp->bp_chaddr" cannot be null, and there's no need to test for it not being null.
125 lines
2.9 KiB
C
125 lines
2.9 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 1.20 2002-12-18 08:53:20 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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void
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cip_if_print(u_char *user _U_, 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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++infodelay;
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ts_print(&h->ts);
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if (memcmp(rfcllc, p, sizeof(rfcllc))==0 && caplen < RFC1483LLC_LEN) {
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printf("[|cip]");
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goto out;
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}
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if (eflag)
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cip_print(length);
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/*
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* Some printers want to check that they're not walking off the
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* end of the packet.
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* Rather than pass it all the way down, we set this global.
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*/
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snapend = p + caplen;
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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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if (xflag)
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default_print(p, caplen);
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out:
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putchar('\n');
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--infodelay;
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if (infoprint)
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info(0);
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}
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