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 /* Extract src, dst addresses */
  50 static inline void
  51 extract_token_addrs(const struct token_header *trp, char *fsrc, char *fdst)
  52 {
  53         memcpy(fdst, (const char *)trp->token_dhost, 6);
  54         memcpy(fsrc, (const char *)trp->token_shost, 6);
  55 }
  56
  57 /*
  58  * Print the TR MAC header
  59  */
  60 static inline void
  61 token_hdr_print(register const struct token_header *trp, register u_int length,
  62            register const u_char *fsrc, register const u_char *fdst)
  63 {
  64         const char *srcname, *dstname;
  65
  66         srcname = etheraddr_string(fsrc);
  67         dstname = etheraddr_string(fdst);
  68
  69         if (vflag)
  70                 (void) printf("%02x %02x %s %s %d: ",
  71                        trp->token_ac,
  72                        trp->token_fc,
  73                        srcname, dstname,
  74                        length);
  75         else
  76                 printf("%s %s %d: ", srcname, dstname, length);
  77 }
  78
  79 static const char *broadcast_indicator[] = {
  80         "Non-Broadcast", "Non-Broadcast",
  81         "Non-Broadcast", "Non-Broadcast",
  82         "All-routes",    "All-routes",
  83         "Single-route",  "Single-route"
  84 };
  85
  86 static const char *direction[] = {
  87         "Forward", "Backward"
  88 };
  89
  90 static const char *largest_frame[] = {
  91         "516",
  92         "1500",
  93         "2052",
  94         "4472",
  95         "8144",
  96         "11407",
  97         "17800",
  98         "??"
  99 };
 100
 101 u_int
 102 token_print(const u_char *p, u_int length, u_int caplen)
 103 {
 104         const struct token_header *trp;
 105         u_short extracted_ethertype;
 106         struct ether_header ehdr;
 107         u_int route_len = 0, hdr_len = TOKEN_HDRLEN;
 108         int seg;
 109
 110         trp = (const struct token_header *)p;
 111
 112         if (caplen < TOKEN_HDRLEN) {
 113                 printf("[|token-ring]");
 114                 return hdr_len;
 115         }
 116
 117         /*
 118          * Get the TR addresses into a canonical form
 119          */
 120         extract_token_addrs(trp, (char*)ESRC(&ehdr), (char*)EDST(&ehdr));
 121
 122         /* Adjust for source routing information in the MAC header */
 123         if (IS_SOURCE_ROUTED(trp)) {
 124                 /* Clear source-routed bit */
 125                 *ESRC(&ehdr) &= 0x7f;
 126
 127                 if (eflag)
 128                         token_hdr_print(trp, length, ESRC(&ehdr), EDST(&ehdr));
 129
 130                 route_len = RIF_LENGTH(trp);
 131                 if (vflag) {
 132                         printf("%s ", broadcast_indicator[BROADCAST(trp)]);
 133                         printf("%s", direction[DIRECTION(trp)]);
 134
 135                         for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
 136                                 printf(" [%d:%d]", RING_NUMBER(trp, seg),
 137                                     BRIDGE_NUMBER(trp, seg));
 138                 } else {
 139                         printf("rt = %x", EXTRACT_16BITS(&trp->token_rcf));
 140
 141                         for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
 142                                 printf(":%x", EXTRACT_16BITS(&trp->token_rseg[seg]));
 143                 }
 144                 printf(" (%s) ", largest_frame[LARGEST_FRAME(trp)]);
 145         } else {
 146                 if (eflag)
 147                         token_hdr_print(trp, length, ESRC(&ehdr), EDST(&ehdr));
 148         }
 149
 150         /* Skip over token ring MAC header and routing information */
 151         hdr_len += route_len;
 152         length -= hdr_len;
 153         p += hdr_len;
 154         caplen -= hdr_len;
 155
 156         /* Frame Control field determines interpretation of packet */
 157         if (FRAME_TYPE(trp) == TOKEN_FC_LLC) {
 158                 /* Try to print the LLC-layer header & higher layers */
 159                 if (llc_print(p, length, caplen, ESRC(&ehdr), EDST(&ehdr),
 160                     &extracted_ethertype) == 0) {
 161                         /* ether_type not known, print raw packet */
 162                         if (!eflag)
 163                                 token_hdr_print(trp,
 164                                     length + TOKEN_HDRLEN + route_len,
 165                                     ESRC(&ehdr), EDST(&ehdr));
 166                         if (extracted_ethertype) {
 167                                 printf("(LLC %s) ",
 168                         etherproto_string(htons(extracted_ethertype)));
 169                         }
 170                         if (!suppress_default_print)
 171                                 default_print(p, caplen);
 172                 }
 173         } else {
 174                 /* Some kinds of TR packet we cannot handle intelligently */
 175                 /* XXX - dissect MAC packets if frame type is 0 */
 176                 if (!eflag)
 177                         token_hdr_print(trp, length + TOKEN_HDRLEN + route_len,
 178                             ESRC(&ehdr), EDST(&ehdr));
 179                 if (!suppress_default_print)
 180                         default_print(p, caplen);
 181         }
 182         return (hdr_len);
 183 }
 184
 185 /*
 186  * This is the top level routine of the printer.  'p' points
 187  * to the TR header of the packet, 'h->ts' is the timestamp,
 188  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 189  * is the number of bytes actually captured.
 190  */
 191 u_int
 192 token_if_print(const struct pcap_pkthdr *h, const u_char *p)
 193 {
 194         return (token_print(p, h->len, h->caplen));
 195 }