The Tcpdump Group git mirrors - tcpdump/blob - print-token.c

   1 /*
   2  * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that: (1) source code distributions
   7  * retain the above copyright notice and this paragraph in its entirety, (2)
   8  * distributions including binary code include the above copyright notice and
   9  * this paragraph in its entirety in the documentation or other materials
  10  * provided with the distribution, and (3) all advertising materials mentioning
  11  * features or use of this software display the following acknowledgement:
  12  * ``This product includes software developed by the University of California,
  13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  14  * the University nor the names of its contributors may be used to endorse
  15  * or promote products derived from this software without specific prior
  16  * written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  *
  21  * Hacked version of print-ether.c  Larry Lile <lile@stdio.com>
  22  *
  23  * Further tweaked to more closely resemble print-fddi.c
  24  *      Guy Harris <guy@alum.mit.edu>
  25  */
  26 #ifndef lint
  27 static const char rcsid[] _U_ =
  28     "@(#) $Header: /tcpdump/master/tcpdump/print-token.c,v 1.27 2005-11-13 12:12:43 guy Exp $";
  29 #endif
  30
  31 #ifdef HAVE_CONFIG_H
  32 #include "config.h"
  33 #endif
  34
  35 #include <tcpdump-stdinc.h>
  36
  37 #include <pcap.h>
  38 #include <stdio.h>
  39 #include <string.h>
  40
  41 #include "interface.h"
  42 #include "extract.h"
  43 #include "addrtoname.h"
  44 #include "ethertype.h"
  45
  46 #include "ether.h"
  47 #include "token.h"
  48
  49 static const char tstr[] = "[|token-ring]";
  50
  51 /* Extract src, dst addresses */
  52 static inline void
  53 extract_token_addrs(const struct token_header *trp, char *fsrc, char *fdst)
  54 {
  55         memcpy(fdst, (const char *)trp->token_dhost, 6);
  56         memcpy(fsrc, (const char *)trp->token_shost, 6);
  57 }
  58
  59 /*
  60  * Print the TR MAC header
  61  */
  62 static inline void
  63 token_hdr_print(register const struct token_header *trp, register u_int length,
  64            register const u_char *fsrc, register const u_char *fdst)
  65 {
  66         const char *srcname, *dstname;
  67
  68         srcname = etheraddr_string(fsrc);
  69         dstname = etheraddr_string(fdst);
  70
  71         if (vflag)
  72                 (void) printf("%02x %02x %s %s %d: ",
  73                        trp->token_ac,
  74                        trp->token_fc,
  75                        srcname, dstname,
  76                        length);
  77         else
  78                 printf("%s %s %d: ", srcname, dstname, length);
  79 }
  80
  81 static const char *broadcast_indicator[] = {
  82         "Non-Broadcast", "Non-Broadcast",
  83         "Non-Broadcast", "Non-Broadcast",
  84         "All-routes",    "All-routes",
  85         "Single-route",  "Single-route"
  86 };
  87
  88 static const char *direction[] = {
  89         "Forward", "Backward"
  90 };
  91
  92 static const char *largest_frame[] = {
  93         "516",
  94         "1500",
  95         "2052",
  96         "4472",
  97         "8144",
  98         "11407",
  99         "17800",
 100         "??"
 101 };
 102
 103 u_int
 104 token_print(const u_char *p, u_int length, u_int caplen)
 105 {
 106         const struct token_header *trp;
 107         u_short extracted_ethertype;
 108         struct ether_header ehdr;
 109         u_int route_len = 0, hdr_len = TOKEN_HDRLEN;
 110         int seg;
 111
 112         trp = (const struct token_header *)p;
 113
 114         if (caplen < TOKEN_HDRLEN) {
 115                 printf("%s", tstr);
 116                 return hdr_len;
 117         }
 118
 119         /*
 120          * Get the TR addresses into a canonical form
 121          */
 122         extract_token_addrs(trp, (char*)ESRC(&ehdr), (char*)EDST(&ehdr));
 123
 124         /* Adjust for source routing information in the MAC header */
 125         if (IS_SOURCE_ROUTED(trp)) {
 126                 /* Clear source-routed bit */
 127                 *ESRC(&ehdr) &= 0x7f;
 128
 129                 if (eflag)
 130                         token_hdr_print(trp, length, ESRC(&ehdr), EDST(&ehdr));
 131
 132                 if (caplen < TOKEN_HDRLEN + 2) {
 133                         printf("%s", tstr);
 134                         return hdr_len;
 135                 }
 136                 route_len = RIF_LENGTH(trp);
 137                 hdr_len += route_len;
 138                 if (caplen < hdr_len) {
 139                         printf("%s", tstr);
 140                         return hdr_len;
 141                 }
 142                 if (vflag) {
 143                         printf("%s ", broadcast_indicator[BROADCAST(trp)]);
 144                         printf("%s", direction[DIRECTION(trp)]);
 145
 146                         for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
 147                                 printf(" [%d:%d]", RING_NUMBER(trp, seg),
 148                                     BRIDGE_NUMBER(trp, seg));
 149                 } else {
 150                         printf("rt = %x", EXTRACT_16BITS(&trp->token_rcf));
 151
 152                         for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
 153                                 printf(":%x", EXTRACT_16BITS(&trp->token_rseg[seg]));
 154                 }
 155                 printf(" (%s) ", largest_frame[LARGEST_FRAME(trp)]);
 156         } else {
 157                 if (eflag)
 158                         token_hdr_print(trp, length, ESRC(&ehdr), EDST(&ehdr));
 159         }
 160
 161         /* Skip over token ring MAC header and routing information */
 162         length -= hdr_len;
 163         p += hdr_len;
 164         caplen -= hdr_len;
 165
 166         /* Frame Control field determines interpretation of packet */
 167         if (FRAME_TYPE(trp) == TOKEN_FC_LLC) {
 168                 /* Try to print the LLC-layer header & higher layers */
 169                 if (llc_print(p, length, caplen, ESRC(&ehdr), EDST(&ehdr),
 170                     &extracted_ethertype) == 0) {
 171                         /* ether_type not known, print raw packet */
 172                         if (!eflag)
 173                                 token_hdr_print(trp,
 174                                     length + TOKEN_HDRLEN + route_len,
 175                                     ESRC(&ehdr), EDST(&ehdr));
 176                         if (extracted_ethertype) {
 177                                 printf("(LLC %s) ",
 178                         etherproto_string(htons(extracted_ethertype)));
 179                         }
 180                         if (!suppress_default_print)
 181                                 default_print(p, caplen);
 182                 }
 183         } else {
 184                 /* Some kinds of TR packet we cannot handle intelligently */
 185                 /* XXX - dissect MAC packets if frame type is 0 */
 186                 if (!eflag)
 187                         token_hdr_print(trp, length + TOKEN_HDRLEN + route_len,
 188                             ESRC(&ehdr), EDST(&ehdr));
 189                 if (!suppress_default_print)
 190                         default_print(p, caplen);
 191         }
 192         return (hdr_len);
 193 }
 194
 195 /*
 196  * This is the top level routine of the printer.  'p' points
 197  * to the TR header of the packet, 'h->ts' is the timestamp,
 198  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 199  * is the number of bytes actually captured.
 200  */
 201 u_int
 202 token_if_print(const struct pcap_pkthdr *h, const u_char *p)
 203 {
 204         return (token_print(p, h->len, h->caplen));
 205 }