166 lines
4.0 KiB
C
166 lines
4.0 KiB
C
/* $NetBSD: print-cip.c,v 1.2 2001/06/25 19:59:57 itojun Exp $ */
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/*
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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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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static const char rcsid[] =
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"@(#) Header: /tcpdump/master/tcpdump/print-cip.c,v 1.13 2001/06/08 04:48:23 guy Exp (LBL)";
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#else
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__RCSID("$NetBSD: print-cip.c,v 1.2 2001/06/25 19:59:57 itojun Exp $");
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#endif
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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 <sys/param.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.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(register const u_char *bp, int length)
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{
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int i;
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if (memcmp(rfcllc, bp, sizeof(rfcllc))) {
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if (qflag) {
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for (i = 0;i < RFC1483LLC_LEN; i++)
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(void)printf("%2.2x ",bp[i]);
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} else {
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for (i = 0;i < RFC1483LLC_LEN - 2; i++)
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(void)printf("%2.2x ",bp[i]);
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etherproto_string(((u_short*)bp)[3]);
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}
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} else {
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if (qflag)
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(void)printf("(null encapsulation)");
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else {
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(void)printf("(null encap)");
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etherproto_string(ETHERTYPE_IP);
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}
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}
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}
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/*
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* This is the top level routine of the printer. 'p' is the points
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* to the raw header of the packet, 'tvp' is the timestamp,
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* 'length' is the length of the packet off the wire, and '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, const struct pcap_pkthdr *h, const u_char *p)
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{
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int caplen = h->caplen;
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int length = h->len;
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u_short ether_type;
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u_short extracted_ethertype;
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u_short *bp;
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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(p, length);
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/*
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* Some printers want to get back at the ethernet addresses,
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* and/or check that they're not walking off the end of the packet.
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* Rather than pass them all the way down, we set these globals.
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*/
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packetp = p;
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snapend = p + caplen;
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if (memcmp(rfcllc, p, sizeof(rfcllc))==0) {
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length -= RFC1483LLC_LEN;
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caplen -= RFC1483LLC_LEN;
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bp = (u_short *)p;
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p += RFC1483LLC_LEN;
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ether_type = ntohs(bp[3]);
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} else {
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ether_type = ETHERTYPE_IP;
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bp = (u_short *)p;
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}
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/*
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* Is it (gag) an 802.3 encapsulation?
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*/
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extracted_ethertype = 0;
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if (ether_type < ETHERMTU) {
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/* Try to print the LLC-layer header & higher layers */
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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((u_char *)bp, length + RFC1483LLC_LEN);
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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 if (ether_encap_print(ether_type, p, length, caplen,
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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((u_char *)bp, length + RFC1483LLC_LEN);
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if (!xflag && !qflag)
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default_print(p, caplen);
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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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}
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