dist/tcpdump/print-token.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that: (1) source code distributions
   9  * retain the above copyright notice and this paragraph in its entirety, (2)
  10  * distributions including binary code include the above copyright notice and
  11  * this paragraph in its entirety in the documentation or other materials
  12  * provided with the distribution, and (3) all advertising materials mentioning
  13  * features or use of this software display the following acknowledgement:
  14  * ``This product includes software developed by the University of California,
  15  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  16  * the University nor the names of its contributors may be used to endorse
  17  * or promote products derived from this software without specific prior
  18  * written permission.
  19  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  20  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  21  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  22  *
  23  * Hacked version of print-ether.c  Larry Lile <lile@stdio.com>
  24  *
  25  * Further tweaked to more closely resemble print-fddi.c
  26  *      Guy Harris <guy@alum.mit.edu>
  27  */
  28 #include <sys/cdefs.h>
  29 #ifndef lint
  30 #if 0
  31 static const char rcsid[] _U_ =
  32     "@(#) Header: /tcpdump/master/tcpdump/print-token.c,v 1.25.2.2 2005/11/13 12:13:01 guy Exp";
  33 #else
  34 __RCSID("$NetBSD: tcpdump2rcsid.ex,v 1.1 2001/06/25 20:09:58 itojun Exp $");
  35 #endif
  36 #endif
  37
  38 #ifdef HAVE_CONFIG_H
  39 #include "config.h"
  40 #endif
  41
  42 #include <tcpdump-stdinc.h>
  43
  44 #include <pcap.h>
  45 #include <stdio.h>
  46 #include <string.h>
  47
  48 #include "interface.h"
  49 #include "addrtoname.h"
  50 #include "ethertype.h"
  51
  52 #include "ether.h"
  53 #include "token.h"
  54
  55 /* Extract src, dst addresses */
  56 static inline void
  57 extract_token_addrs(const struct token_header *trp, char *fsrc, char *fdst)
  58 {
  59         memcpy(fdst, (const char *)trp->token_dhost, 6);
  60         memcpy(fsrc, (const char *)trp->token_shost, 6);
  61 }
  62
  63 /*
  64  * Print the TR MAC header
  65  */
  66 static inline void
  67 token_hdr_print(register const struct token_header *trp, register u_int length,
  68            register const u_char *fsrc, register const u_char *fdst)
  69 {
  70         const char *srcname, *dstname;
  71
  72         srcname = etheraddr_string(fsrc);
  73         dstname = etheraddr_string(fdst);
  74
  75         if (vflag)
  76                 (void) printf("%02x %02x %s %s %d: ",
  77                        trp->token_ac,
  78                        trp->token_fc,
  79                        srcname, dstname,
  80                        length);
  81         else
  82                 printf("%s %s %d: ", srcname, dstname, length);
  83 }
  84
  85 static const char *broadcast_indicator[] = {
  86         "Non-Broadcast", "Non-Broadcast",
  87         "Non-Broadcast", "Non-Broadcast",
  88         "All-routes",    "All-routes",
  89         "Single-route",  "Single-route"
  90 };
  91
  92 static const char *direction[] = {
  93         "Forward", "Backward"
  94 };
  95
  96 static const char *largest_frame[] = {
  97         "516",
  98         "1500",
  99         "2052",
 100         "4472",
 101         "8144",
 102         "11407",
 103         "17800",
 104         "??"
 105 };
 106
 107 u_int
 108 token_print(const u_char *p, u_int length, u_int caplen)
 109 {
 110         const struct token_header *trp;
 111         u_short extracted_ethertype;
 112         struct ether_header ehdr;
 113         u_int route_len = 0, hdr_len = TOKEN_HDRLEN;
 114         int seg;
 115
 116         trp = (const struct token_header *)p;
 117
 118         if (caplen < TOKEN_HDRLEN) {
 119                 printf("[|token-ring]");
 120                 return hdr_len;
 121         }
 122
 123         /*
 124          * Get the TR addresses into a canonical form
 125          */
 126         extract_token_addrs(trp, (char*)ESRC(&ehdr), (char*)EDST(&ehdr));
 127
 128         /* Adjust for source routing information in the MAC header */
 129         if (IS_SOURCE_ROUTED(trp)) {
 130                 /* Clear source-routed bit */
 131                 *ESRC(&ehdr) &= 0x7f;
 132
 133                 if (eflag)
 134                         token_hdr_print(trp, length, ESRC(&ehdr), EDST(&ehdr));
 135
 136                 route_len = RIF_LENGTH(trp);
 137                 if (vflag) {
 138                         printf("%s ", broadcast_indicator[BROADCAST(trp)]);
 139                         printf("%s", direction[DIRECTION(trp)]);
 140
 141                         for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
 142                                 printf(" [%d:%d]", RING_NUMBER(trp, seg),
 143                                     BRIDGE_NUMBER(trp, seg));
 144                 } else {
 145                         printf("rt = %x", ntohs(trp->token_rcf));
 146
 147                         for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
 148                                 printf(":%x", ntohs(trp->token_rseg[seg]));
 149                 }
 150                 printf(" (%s) ", largest_frame[LARGEST_FRAME(trp)]);
 151         } else {
 152                 if (eflag)
 153                         token_hdr_print(trp, length, ESRC(&ehdr), EDST(&ehdr));
 154         }
 155
 156         /* Skip over token ring MAC header and routing information */
 157         hdr_len += route_len;
 158         length -= hdr_len;
 159         p += hdr_len;
 160         caplen -= hdr_len;
 161
 162         /* Frame Control field determines interpretation of packet */
 163         if (FRAME_TYPE(trp) == TOKEN_FC_LLC) {
 164                 /* Try to print the LLC-layer header & higher layers */
 165                 if (llc_print(p, length, caplen, ESRC(&ehdr), EDST(&ehdr),
 166                     &extracted_ethertype) == 0) {
 167                         /* ether_type not known, print raw packet */
 168                         if (!eflag)
 169                                 token_hdr_print(trp,
 170                                     length + TOKEN_HDRLEN + route_len,
 171                                     ESRC(&ehdr), EDST(&ehdr));
 172                         if (extracted_ethertype) {
 173                                 printf("(LLC %s) ",
 174                         etherproto_string(htons(extracted_ethertype)));
 175                         }
 176                         if (!suppress_default_print)
 177                                 default_print(p, caplen);
 178                 }
 179         } else {
 180                 /* Some kinds of TR packet we cannot handle intelligently */
 181                 /* XXX - dissect MAC packets if frame type is 0 */
 182                 if (!eflag)
 183                         token_hdr_print(trp, length + TOKEN_HDRLEN + route_len,
 184                             ESRC(&ehdr), EDST(&ehdr));
 185                 if (!suppress_default_print)
 186                         default_print(p, caplen);
 187         }
 188         return (hdr_len);
 189 }
 190
 191 /*
 192  * This is the top level routine of the printer.  'p' points
 193  * to the TR header of the packet, 'h->ts' is the timestamp,
 194  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 195  * is the number of bytes actually captured.
 196  */
 197 u_int
 198 token_if_print(const struct pcap_pkthdr *h, const u_char *p)
 199 {
 200         return (token_print(p, h->len, h->caplen));
 201 }