238 lines
6.5 KiB
C
238 lines
6.5 KiB
C
/* $NetBSD: print-token.c,v 1.4 2002/05/31 09:45:46 itojun Exp $ */
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/*
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* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Hacked version of print-ether.c Larry Lile <lile@stdio.com>
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*
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* Further tweaked to more closely resemble print-fddi.c
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* Guy Harris <guy@alum.mit.edu>
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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-token.c,v 1.15 2002/05/29 10:06:27 guy Exp";
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#else
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__RCSID("$NetBSD: print-token.c,v 1.4 2002/05/31 09:45:46 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 <sys/param.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <pcap.h>
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#include <stdio.h>
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#include <string.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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#include "token.h"
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/* Extract src, dst addresses */
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static inline void
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extract_token_addrs(const struct token_header *trp, char *fsrc, char *fdst)
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{
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memcpy(fdst, (const char *)trp->token_dhost, 6);
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memcpy(fsrc, (const char *)trp->token_shost, 6);
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}
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/*
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* Print the TR MAC header
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*/
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static inline void
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token_hdr_print(register const struct token_header *trp, register u_int length,
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register const u_char *fsrc, register const u_char *fdst)
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{
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const char *srcname, *dstname;
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srcname = etheraddr_string(fsrc);
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dstname = etheraddr_string(fdst);
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if (vflag)
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(void) printf("%02x %02x %s %s %d: ",
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trp->token_ac,
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trp->token_fc,
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srcname, dstname,
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length);
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else
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printf("%s %s %d: ", srcname, dstname, length);
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}
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static const char *broadcast_indicator[] = {
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"Non-Broadcast", "Non-Broadcast",
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"Non-Broadcast", "Non-Broadcast",
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"All-routes", "All-routes",
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"Single-route", "Single-route"
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};
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static const char *direction[] = {
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"Forward", "Backward"
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};
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static const char *largest_frame[] = {
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"516",
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"1500",
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"2052",
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"4472",
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"8144",
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"11407",
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"17800",
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"??"
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};
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u_int
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token_print(const u_char *p, u_int length, u_int caplen)
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{
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const struct token_header *trp;
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u_short extracted_ethertype;
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struct ether_header ehdr;
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u_int route_len = 0, hdr_len = TOKEN_HDRLEN, seg;
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trp = (const struct token_header *)p;
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if (caplen < TOKEN_HDRLEN) {
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printf("[|token-ring]");
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return hdr_len;
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}
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/*
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* Get the TR addresses into a canonical form
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*/
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extract_token_addrs(trp, (char*)ESRC(&ehdr), (char*)EDST(&ehdr));
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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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snapend = p + caplen;
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/*
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* Actually, the only printers that use packetp are print-arp.c
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* and print-bootp.c, and they assume that packetp points to an
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* Ethernet header. The right thing to do is to fix them to know
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* which link type is in use when they excavate. XXX
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*/
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packetp = (u_char *)&ehdr;
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/* Adjust for source routing information in the MAC header */
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if (IS_SOURCE_ROUTED(trp)) {
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/* Clear source-routed bit */
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*ESRC(&ehdr) &= 0x7f;
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if (eflag)
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token_hdr_print(trp, length, ESRC(&ehdr), EDST(&ehdr));
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route_len = RIF_LENGTH(trp);
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if (vflag) {
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printf("%s ", broadcast_indicator[BROADCAST(trp)]);
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printf("%s", direction[DIRECTION(trp)]);
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for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
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printf(" [%d:%d]", RING_NUMBER(trp, seg),
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BRIDGE_NUMBER(trp, seg));
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} else {
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printf("rt = %x", ntohs(trp->token_rcf));
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for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
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printf(":%x", ntohs(trp->token_rseg[seg]));
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}
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printf(" (%s) ", largest_frame[LARGEST_FRAME(trp)]);
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} else {
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if (eflag)
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token_hdr_print(trp, length, ESRC(&ehdr), EDST(&ehdr));
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}
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/* Skip over token ring MAC header and routing information */
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hdr_len += route_len;
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length -= hdr_len;
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p += hdr_len;
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caplen -= hdr_len;
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/* Frame Control field determines interpretation of packet */
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extracted_ethertype = 0;
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if (FRAME_TYPE(trp) == TOKEN_FC_LLC) {
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/* Try to print the LLC-layer header & higher layers */
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if (llc_print(p, length, caplen, ESRC(&ehdr), EDST(&ehdr),
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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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token_hdr_print(trp,
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length + TOKEN_HDRLEN + route_len,
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ESRC(&ehdr), EDST(&ehdr));
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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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/* Some kinds of TR packet we cannot handle intelligently */
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/* XXX - dissect MAC packets if frame type is 0 */
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if (!eflag)
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token_hdr_print(trp, length + TOKEN_HDRLEN + route_len,
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ESRC(&ehdr), EDST(&ehdr));
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if (!xflag && !qflag)
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default_print(p, caplen);
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}
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return (hdr_len);
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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 TR 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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token_if_print(u_char *user, 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_int hdr_len;
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++infodelay;
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ts_print(&h->ts);
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hdr_len = token_print(p, length, caplen);
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/*
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* If "-x" was specified, print stuff past the Token Ring header,
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* if there's anything to print.
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*/
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if (xflag && caplen > hdr_len)
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default_print(p + hdr_len, caplen - hdr_len);
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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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