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https://github.com/the-tcpdump-group/tcpdump.git
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737c58073a
them in "print-sll.c" - as a cooked-mode capture may be reading from non-Ethernet, non-802.x devices, it may well see some ETH_P_/LINUX_SLL_P_ types that don't mean "this is an 802.2 LLC frame". We currently assume that the ETH_P_ values won't change in the kernel, so we don't have to explicitly map them. In various link-layer packet printers, if we don't handle the next layer up of packet type, and are printing the link-layer header, use the correct pointer to that header (i.e., if we've stepped "p" past the link-layer header, don't use "p", use a pointer to the beginning of the packet), and use the correct length (i.e., if we've subtracted the length of the link-layer header, add it back in, so that we always print the full packet length).
140 lines
3.6 KiB
C
140 lines
3.6 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-lane.c,v 1.11 2000-12-22 22:45:11 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 <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 "ether.h"
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#include "lane.h"
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static inline void
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lane_print(register const u_char *bp, int length)
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{
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register const struct lecdatahdr_8023 *ep;
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ep = (const struct lecdatahdr_8023 *)bp;
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if (qflag)
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(void)printf("lecid:%d %s %s %d: ",
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ntohs(ep->le_header),
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etheraddr_string(ep->h_source),
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etheraddr_string(ep->h_dest),
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length);
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else
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(void)printf("lecid:%d %s %s %s %d: ",
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ntohs(ep->le_header),
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etheraddr_string(ep->h_source),
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etheraddr_string(ep->h_dest),
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etherproto_string(ep->h_type),
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length);
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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 ether header of the packet, 'h->tv' 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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lane_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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struct lecdatahdr_8023 *ep;
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u_short ether_type;
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u_short extracted_ethertype;
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ts_print(&h->ts);
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if (caplen < sizeof(struct lecdatahdr_8023)) {
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printf("[|lane]");
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goto out;
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}
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if (eflag)
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lane_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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length -= sizeof(struct lecdatahdr_8023);
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caplen -= sizeof(struct lecdatahdr_8023);
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ep = (struct lecdatahdr_8023 *)p;
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p += sizeof(struct lecdatahdr_8023);
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ether_type = ntohs(ep->h_type);
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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, ep->h_source, ep->h_dest,
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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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lane_print((u_char *)ep, length + sizeof(*ep));
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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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lane_print((u_char *)ep, length + sizeof(*ep));
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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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