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[] =
  28     "@(#) $Header: /tcpdump/master/tcpdump/print-token.c,v 1.6 2000-09-29 04:58:52 guy Exp $";
  29 #endif
  30
  31 #ifdef HAVE_CONFIG_H
  32 #include "config.h"
  33 #endif
  34
  35 #include <sys/param.h>
  36 #include <sys/time.h>
  37 #include <sys/socket.h>
  38
  39 struct mbuf;
  40 struct rtentry;
  41
  42 #include <netinet/in.h>
  43
  44 #include <pcap.h>
  45 #include <stdio.h>
  46
  47 #include "interface.h"
  48 #include "addrtoname.h"
  49 #include "ethertype.h"
  50
  51 #include "ether.h"
  52 #include "token.h"
  53
  54 /* Extract src, dst addresses */
  55 static inline void
  56 extract_token_addrs(const struct token_header *trp, char *fsrc, char *fdst)
  57 {
  58         memcpy(fdst, (char *)trp->token_dhost, 6);
  59         memcpy(fsrc, (char *)trp->token_shost, 6);
  60 }
  61
  62 /*
  63  * Print the TR MAC header
  64  */
  65 static inline void
  66 token_print(register const struct token_header *trp, register u_int length,
  67            register const u_char *fsrc, register const u_char *fdst)
  68 {
  69         char *srcname, *dstname;
  70
  71         srcname = etheraddr_string(fsrc);
  72         dstname = etheraddr_string(fdst);
  73
  74         if (vflag)
  75                 (void) printf("%02x %02x %s %s %d: ",
  76                        trp->token_ac,
  77                        trp->token_fc,
  78                        srcname, dstname,
  79                        length);
  80         else
  81                 printf("%s %s %d: ", srcname, dstname, length);
  82 }
  83
  84 static char *broadcast_indicator[] = {
  85         "Non-Broadcast", "Non-Broadcast",
  86         "Non-Broadcast", "Non-Broadcast",
  87         "All-routes",    "All-routes",
  88         "Single-route",  "Single-route"
  89 };
  90
  91 static char *direction[] = {
  92         "Forward", "Backward"
  93 };
  94
  95 static char *largest_frame[] = {
  96         "516",
  97         "1500",
  98         "2052",
  99         "4472",
 100         "8144",
 101         "11407",
 102         "17800",
 103         "??"
 104 };
 105
 106 /*
 107  * This is the top level routine of the printer.  'p' is the points
 108  * to the TR header of the packet, 'tvp' is the timestamp,
 109  * 'length' is the length of the packet off the wire, and 'caplen'
 110  * is the number of bytes actually captured.
 111  */
 112 void
 113 token_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
 114 {
 115         u_int caplen = h->caplen;
 116         u_int length = h->len;
 117         struct token_header *trp;
 118         u_short extracted_ethertype;
 119         struct ether_header ehdr;
 120         u_int route_len = 0, seg;
 121
 122         trp = (struct token_header *)p;
 123
 124         ts_print(&h->ts);
 125
 126         if (caplen < TOKEN_HDRLEN) {
 127                 printf("[|token-ring]");
 128                 goto out;
 129         }
 130         /*
 131          * Get the TR addresses into a canonical form
 132          */
 133         extract_token_addrs(trp, (char*)ESRC(&ehdr), (char*)EDST(&ehdr));
 134         /*
 135          * Some printers want to get back at the ethernet addresses,
 136          * and/or check that they're not walking off the end of the packet.
 137          * Rather than pass them all the way down, we set these globals.
 138          */
 139         snapend = p + caplen;
 140         /*
 141          * Actually, the only printer that uses packetp is print-bootp.c,
 142          * and it assumes that packetp points to an Ethernet header.  The
 143          * right thing to do is to fix print-bootp.c to know which link
 144          * type is in use when it excavates. XXX
 145          */
 146         packetp = (u_char *)&ehdr;
 147
 148         /* Adjust for source routing information in the MAC header */
 149         if (IS_SOURCE_ROUTED(trp)) {
 150                 /* Clear source-routed bit */
 151                 *ESRC(&ehdr) &= 0x7f;
 152
 153                 if (eflag)
 154                         token_print(trp, length, ESRC(&ehdr), EDST(&ehdr));
 155
 156                 route_len = RIF_LENGTH(trp);
 157                 if (vflag) {
 158                         printf("%s ", broadcast_indicator[BROADCAST(trp)]);
 159                         printf("%s", direction[DIRECTION(trp)]);
 160
 161                         for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
 162                                 printf(" [%d:%d]", RING_NUMBER(trp, seg),
 163                                     BRIDGE_NUMBER(trp, seg));
 164                 } else {
 165                         printf("rt = %x", ntohs(trp->token_rcf));
 166
 167                         for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
 168                                 printf(":%x", ntohs(trp->token_rseg[seg]));
 169                 }
 170                 printf(" (%s) ", largest_frame[LARGEST_FRAME(trp)]);
 171         } else {
 172                 if (eflag)
 173                         token_print(trp, length, ESRC(&ehdr), EDST(&ehdr));
 174         }
 175
 176         /* Skip over token ring MAC header and routing information */
 177         length -= TOKEN_HDRLEN + route_len;
 178         p += TOKEN_HDRLEN + route_len;
 179         caplen -= TOKEN_HDRLEN + route_len;
 180
 181         /* Frame Control field determines interpretation of packet */
 182         extracted_ethertype = 0;
 183         if (FRAME_TYPE(trp) == TOKEN_FC_LLC) {
 184                 /* Try to print the LLC-layer header & higher layers */
 185                 if (llc_print(p, length, caplen, ESRC(&ehdr), EDST(&ehdr))
 186                     == 0) {
 187                         /* ether_type not known, print raw packet */
 188                         if (!eflag)
 189                                 token_print(trp, length,
 190                                     ESRC(&ehdr), EDST(&ehdr));
 191                         if (extracted_ethertype) {
 192                                 printf("(LLC %s) ",
 193                         etherproto_string(htons(extracted_ethertype)));
 194                         }
 195                         if (!xflag && !qflag)
 196                                 default_print(p, caplen);
 197                 }
 198         } else {
 199                 /* Some kinds of TR packet we cannot handle intelligently */
 200                 /* XXX - dissect MAC packets if frame type is 0 */
 201                 if (!eflag)
 202                         token_print(trp, length, ESRC(&ehdr), EDST(&ehdr));
 203                 if (!xflag && !qflag)
 204                         default_print(p, caplen);
 205         }
 206         if (xflag)
 207                 default_print(p, caplen);
 208 out:
 209         putchar('\n');
 210 }