contrib/tcpdump-3.9/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 1.25.2.2 2005/11/13 12:13:01 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 "addrtoname.h"
  43 #include "ethertype.h"
  44
  45 #include "ether.h"
  46 #include "token.h"
  47
  48 /* Extract src, dst addresses */
  49 static inline void
  50 extract_token_addrs(const struct token_header *trp, char *fsrc, char *fdst)
  51 {
  52         memcpy(fdst, (const char *)trp->token_dhost, 6);
  53         memcpy(fsrc, (const char *)trp->token_shost, 6);
  54 }
  55
  56 /*
  57  * Print the TR MAC header
  58  */
  59 static inline void
  60 token_hdr_print(register const struct token_header *trp, register u_int length,
  61            register const u_char *fsrc, register const u_char *fdst)
  62 {
  63         const char *srcname, *dstname;
  64
  65         srcname = etheraddr_string(fsrc);
  66         dstname = etheraddr_string(fdst);
  67
  68         if (vflag)
  69                 (void) printf("%02x %02x %s %s %d: ",
  70                        trp->token_ac,
  71                        trp->token_fc,
  72                        srcname, dstname,
  73                        length);
  74         else
  75                 printf("%s %s %d: ", srcname, dstname, length);
  76 }
  77
  78 static const char *broadcast_indicator[] = {
  79         "Non-Broadcast", "Non-Broadcast",
  80         "Non-Broadcast", "Non-Broadcast",
  81         "All-routes",    "All-routes",
  82         "Single-route",  "Single-route"
  83 };
  84
  85 static const char *direction[] = {
  86         "Forward", "Backward"
  87 };
  88
  89 static const char *largest_frame[] = {
  90         "516",
  91         "1500",
  92         "2052",
  93         "4472",
  94         "8144",
  95         "11407",
  96         "17800",
  97         "??"
  98 };
  99
 100 u_int
 101 token_print(const u_char *p, u_int length, u_int caplen)
 102 {
 103         const struct token_header *trp;
 104         u_short extracted_ethertype;
 105         struct ether_header ehdr;
 106         u_int route_len = 0, hdr_len = TOKEN_HDRLEN;
 107         int seg;
 108
 109         trp = (const struct token_header *)p;
 110
 111         if (caplen < TOKEN_HDRLEN) {
 112                 printf("[|token-ring]");
 113                 return hdr_len;
 114         }
 115
 116         /*
 117          * Get the TR addresses into a canonical form
 118          */
 119         extract_token_addrs(trp, (char*)ESRC(&ehdr), (char*)EDST(&ehdr));
 120
 121         /* Adjust for source routing information in the MAC header */
 122         if (IS_SOURCE_ROUTED(trp)) {
 123                 /* Clear source-routed bit */
 124                 *ESRC(&ehdr) &= 0x7f;
 125
 126                 if (eflag)
 127                         token_hdr_print(trp, length, ESRC(&ehdr), EDST(&ehdr));
 128
 129                 route_len = RIF_LENGTH(trp);
 130                 if (vflag) {
 131                         printf("%s ", broadcast_indicator[BROADCAST(trp)]);
 132                         printf("%s", direction[DIRECTION(trp)]);
 133
 134                         for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
 135                                 printf(" [%d:%d]", RING_NUMBER(trp, seg),
 136                                     BRIDGE_NUMBER(trp, seg));
 137                 } else {
 138                         printf("rt = %x", ntohs(trp->token_rcf));
 139
 140                         for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
 141                                 printf(":%x", ntohs(trp->token_rseg[seg]));
 142                 }
 143                 printf(" (%s) ", largest_frame[LARGEST_FRAME(trp)]);
 144         } else {
 145                 if (eflag)
 146                         token_hdr_print(trp, length, ESRC(&ehdr), EDST(&ehdr));
 147         }
 148
 149         /* Skip over token ring MAC header and routing information */
 150         hdr_len += route_len;
 151         length -= hdr_len;
 152         p += hdr_len;
 153         caplen -= hdr_len;
 154
 155         /* Frame Control field determines interpretation of packet */
 156         if (FRAME_TYPE(trp) == TOKEN_FC_LLC) {
 157                 /* Try to print the LLC-layer header & higher layers */
 158                 if (llc_print(p, length, caplen, ESRC(&ehdr), EDST(&ehdr),
 159                     &extracted_ethertype) == 0) {
 160                         /* ether_type not known, print raw packet */
 161                         if (!eflag)
 162                                 token_hdr_print(trp,
 163                                     length + TOKEN_HDRLEN + route_len,
 164                                     ESRC(&ehdr), EDST(&ehdr));
 165                         if (extracted_ethertype) {
 166                                 printf("(LLC %s) ",
 167                         etherproto_string(htons(extracted_ethertype)));
 168                         }
 169                         if (!suppress_default_print)
 170                                 default_print(p, caplen);
 171                 }
 172         } else {
 173                 /* Some kinds of TR packet we cannot handle intelligently */
 174                 /* XXX - dissect MAC packets if frame type is 0 */
 175                 if (!eflag)
 176                         token_hdr_print(trp, length + TOKEN_HDRLEN + route_len,
 177                             ESRC(&ehdr), EDST(&ehdr));
 178                 if (!suppress_default_print)
 179                         default_print(p, caplen);
 180         }
 181         return (hdr_len);
 182 }
 183
 184 /*
 185  * This is the top level routine of the printer.  'p' points
 186  * to the TR header of the packet, 'h->ts' is the timestamp,
 187  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 188  * is the number of bytes actually captured.
 189  */
 190 u_int
 191 token_if_print(const struct pcap_pkthdr *h, const u_char *p)
 192 {
 193         return (token_print(p, h->len, h->caplen));
 194 }