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/*
* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific prior
* written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* Hacked version of print-ether.c Larry Lile <lile@stdio.com>
*
* Further tweaked to more closely resemble print-fddi.c
* Guy Harris <guy@alum.mit.edu>
*
* $FreeBSD$
*/
#ifndef lint
static const char rcsid[] =
"@(#) $Header: /tcpdump/master/tcpdump/print-token.c,v 1.13 2001/09/18 15:46:37 fenner Exp $";
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/param.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <pcap.h>
#include <stdio.h>
#include <string.h>
#include "interface.h"
#include "addrtoname.h"
#include "ethertype.h"
#include "ether.h"
#include "token.h"
/* Extract src, dst addresses */
static inline void
extract_token_addrs(const struct token_header *trp, char *fsrc, char *fdst)
{
memcpy(fdst, (const char *)trp->token_dhost, 6);
memcpy(fsrc, (const char *)trp->token_shost, 6);
}
/*
* Print the TR MAC header
*/
static inline void
token_print(register const struct token_header *trp, register u_int length,
register const u_char *fsrc, register const u_char *fdst)
{
const char *srcname, *dstname;
srcname = etheraddr_string(fsrc);
dstname = etheraddr_string(fdst);
if (vflag)
(void) printf("%02x %02x %s %s %d: ",
trp->token_ac,
trp->token_fc,
srcname, dstname,
length);
else
printf("%s %s %d: ", srcname, dstname, length);
}
static const char *broadcast_indicator[] = {
"Non-Broadcast", "Non-Broadcast",
"Non-Broadcast", "Non-Broadcast",
"All-routes", "All-routes",
"Single-route", "Single-route"
};
static const char *direction[] = {
"Forward", "Backward"
};
static const char *largest_frame[] = {
"516",
"1500",
"2052",
"4472",
"8144",
"11407",
"17800",
"??"
};
/*
* This is the top level routine of the printer. 'p' is the points
* to the TR header of the packet, 'tvp' is the timestamp,
* 'length' is the length of the packet off the wire, and 'caplen'
* is the number of bytes actually captured.
*/
void
token_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
{
u_int caplen = h->caplen;
u_int length = h->len;
const struct token_header *trp;
u_short extracted_ethertype;
struct ether_header ehdr;
u_int route_len = 0, seg;
trp = (const struct token_header *)p;
++infodelay;
ts_print(&h->ts);
if (caplen < TOKEN_HDRLEN) {
printf("[|token-ring]");
goto out;
}
/*
* Get the TR addresses into a canonical form
*/
extract_token_addrs(trp, (char*)ESRC(&ehdr), (char*)EDST(&ehdr));
/*
* Some printers want to get back at the ethernet addresses,
* and/or check that they're not walking off the end of the packet.
* Rather than pass them all the way down, we set these globals.
*/
snapend = p + caplen;
/*
* Actually, the only printers that use packetp are print-arp.c
* and print-bootp.c, and they assume that packetp points to an
* Ethernet header. The right thing to do is to fix them to know
* which link type is in use when they excavate. XXX
*/
packetp = (u_char *)&ehdr;
/* Adjust for source routing information in the MAC header */
if (IS_SOURCE_ROUTED(trp)) {
/* Clear source-routed bit */
*ESRC(&ehdr) &= 0x7f;
if (eflag)
token_print(trp, length, ESRC(&ehdr), EDST(&ehdr));
route_len = RIF_LENGTH(trp);
if (vflag) {
printf("%s ", broadcast_indicator[BROADCAST(trp)]);
printf("%s", direction[DIRECTION(trp)]);
for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
printf(" [%d:%d]", RING_NUMBER(trp, seg),
BRIDGE_NUMBER(trp, seg));
} else {
printf("rt = %x", ntohs(trp->token_rcf));
for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
printf(":%x", ntohs(trp->token_rseg[seg]));
}
printf(" (%s) ", largest_frame[LARGEST_FRAME(trp)]);
} else {
if (eflag)
token_print(trp, length, ESRC(&ehdr), EDST(&ehdr));
}
/* Skip over token ring MAC header and routing information */
length -= TOKEN_HDRLEN + route_len;
p += TOKEN_HDRLEN + route_len;
caplen -= TOKEN_HDRLEN + route_len;
/* Frame Control field determines interpretation of packet */
extracted_ethertype = 0;
if (FRAME_TYPE(trp) == TOKEN_FC_LLC) {
/* Try to print the LLC-layer header & higher layers */
if (llc_print(p, length, caplen, ESRC(&ehdr), EDST(&ehdr),
&extracted_ethertype) == 0) {
/* ether_type not known, print raw packet */
if (!eflag)
token_print(trp,
length + TOKEN_HDRLEN + route_len,
ESRC(&ehdr), EDST(&ehdr));
if (extracted_ethertype) {
printf("(LLC %s) ",
etherproto_string(htons(extracted_ethertype)));
}
if (!xflag && !qflag)
default_print(p, caplen);
}
} else {
/* Some kinds of TR packet we cannot handle intelligently */
/* XXX - dissect MAC packets if frame type is 0 */
if (!eflag)
token_print(trp, length + TOKEN_HDRLEN + route_len,
ESRC(&ehdr), EDST(&ehdr));
if (!xflag && !qflag)
default_print(p, caplen);
}
if (xflag)
default_print(p, caplen);
out:
putchar('\n');
--infodelay;
if (infoprint)
info(0);
}
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