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print-token.c

/*
 * 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>
 */
#ifndef lint
static const char rcsid[] _U_ =
    "@(#) $Header: /tcpdump/master/tcpdump/print-token.c,v 1.22.2.2 2003/11/16 08:51:51 guy Exp $";
#endif

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <tcpdump-stdinc.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_hdr_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",
      "??"
};

u_int
token_print(const u_char *p, u_int length, u_int caplen)
{
      const struct token_header *trp;
      u_short extracted_ethertype;
      struct ether_header ehdr;
      u_int route_len = 0, hdr_len = TOKEN_HDRLEN;
      int seg;

      trp = (const struct token_header *)p;

      if (caplen < TOKEN_HDRLEN) {
            printf("[|token-ring]");
            return hdr_len;
      }

      /*
       * Get the TR addresses into a canonical form
       */
      extract_token_addrs(trp, (char*)ESRC(&ehdr), (char*)EDST(&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_hdr_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_hdr_print(trp, length, ESRC(&ehdr), EDST(&ehdr));
      }

      /* Skip over token ring MAC header and routing information */
      hdr_len += route_len;
      length -= hdr_len;
      p += hdr_len;
      caplen -= hdr_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_hdr_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_hdr_print(trp, length + TOKEN_HDRLEN + route_len,
                      ESRC(&ehdr), EDST(&ehdr));
            if (!xflag && !qflag)
                  default_print(p, caplen);
      }
      return (hdr_len);
}

/*
 * This is the top level routine of the printer.  'p' points
 * to the TR header of the packet, 'h->ts' is the timestamp,
 * 'h->length' is the length of the packet off the wire, and 'h->caplen'
 * is the number of bytes actually captured.
 */
u_int
token_if_print(const struct pcap_pkthdr *h, const u_char *p)
{
      return (token_print(p, h->len, h->caplen));
}

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