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 1.3 2000-09-23 08:03:41 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 #include <net/if.h>
  42
  43 #include <netinet/in.h>
  44 #include <netinet/in_systm.h>
  45 #include <netinet/ip.h>
  46
  47 #include <pcap.h>
  48 #include <stdio.h>
  49
  50 #include "interface.h"
  51 #include "addrtoname.h"
  52 #include "ethertype.h"
  53
  54 #include "ether.h"
  55 #include "token.h"
  56
  57 /* Extract src, dst addresses */
  58 static inline void
  59 extract_token_addrs(const struct token_header *trp, char *fsrc, char *fdst)
  60 {
  61         memcpy(fdst, (char *)trp->token_dhost, 6);
  62         memcpy(fsrc, (char *)trp->token_shost, 6);
  63 }
  64
  65 /*
  66  * Print the TR MAC header
  67  */
  68 static inline void
  69 token_print(register const struct token_header *trp, register u_int length,
  70            register const u_char *fsrc, register const u_char *fdst)
  71 {
  72         char *srcname, *dstname;
  73
  74         srcname = etheraddr_string(fsrc);
  75         dstname = etheraddr_string(fdst);
  76
  77         if (vflag)
  78                 (void) printf("%02x %02x %s %s %d: ",
  79                        trp->token_ac,
  80                        trp->token_fc,
  81                        srcname, dstname,
  82                        length);
  83         else
  84                 printf("%s %s %d: ", srcname, dstname, length);
  85 }
  86
  87 static char *broadcast_indicator[] = {
  88         "Non-Broadcast", "Non-Broadcast",
  89         "Non-Broadcast", "Non-Broadcast",
  90         "All-routes",    "All-routes",
  91         "Single-route",  "Single-route"
  92 };
  93
  94 static char *direction[] = {
  95         "Forward", "Backward"
  96 };
  97
  98 static char *largest_frame[] = {
  99         "516",
 100         "1500",
 101         "2052",
 102         "4472",
 103         "8144",
 104         "11407",
 105         "17800",
 106         "??"
 107 };
 108
 109 /*
 110  * This is the top level routine of the printer.  'p' is the points
 111  * to the TR header of the packet, 'tvp' is the timestamp,
 112  * 'length' is the length of the packet off the wire, and 'caplen'
 113  * is the number of bytes actually captured.
 114  */
 115 void
 116 token_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
 117 {
 118         u_int caplen = h->caplen;
 119         u_int length = h->len;
 120         struct token_header *trp;
 121         u_short extracted_ethertype;
 122         struct ether_header ehdr;
 123         u_int route_len = 0, seg;
 124
 125         trp = (struct token_header *)p;
 126
 127         ts_print(&h->ts);
 128
 129         if (caplen < TOKEN_HDRLEN) {
 130                 printf("[|token-ring]");
 131                 goto out;
 132         }
 133         /*
 134          * Get the TR addresses into a canonical form
 135          */
 136         extract_token_addrs(trp, (char*)ESRC(&ehdr), (char*)EDST(&ehdr));
 137         /*
 138          * Some printers want to get back at the ethernet addresses,
 139          * and/or check that they're not walking off the end of the packet.
 140          * Rather than pass them all the way down, we set these globals.
 141          */
 142         snapend = p + caplen;
 143         /*
 144          * Actually, the only printer that uses packetp is print-bootp.c,
 145          * and it assumes that packetp points to an Ethernet header.  The
 146          * right thing to do is to fix print-bootp.c to know which link
 147          * type is in use when it excavates. XXX
 148          */
 149         packetp = (u_char *)&ehdr;
 150
 151         /* Adjust for source routing information in the MAC header */
 152         if (IS_SOURCE_ROUTED(trp)) {
 153                 /* Clear source-routed bit */
 154                 *ESRC(&ehdr) &= 0x7f;
 155
 156                 if (eflag)
 157                         token_print(trp, length, ESRC(&ehdr), EDST(&ehdr));
 158
 159                 route_len = RIF_LENGTH(trp);
 160                 if (vflag) {
 161                         printf("%s ", broadcast_indicator[BROADCAST(trp)]);
 162                         printf("%s", direction[DIRECTION(trp)]);
 163
 164                         for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
 165                                 printf(" [%d:%d]", RING_NUMBER(trp, seg),
 166                                     BRIDGE_NUMBER(trp, seg));
 167                 } else {
 168                         printf("rt = %x", ntohs(trp->token_rcf));
 169
 170                         for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
 171                                 printf(":%x", ntohs(trp->token_rseg[seg]));
 172                 }
 173                 printf(" (%s) ", largest_frame[LARGEST_FRAME(trp)]);
 174         } else {
 175                 if (eflag)
 176                         token_print(trp, length, ESRC(&ehdr), EDST(&ehdr));
 177         }
 178
 179         /* Skip over token ring MAC header and routing information */
 180         length -= TOKEN_HDRLEN + route_len;
 181         p += TOKEN_HDRLEN + route_len;
 182         caplen -= TOKEN_HDRLEN + route_len;
 183
 184         /* Frame Control field determines interpretation of packet */
 185         extracted_ethertype = 0;
 186         if (FRAME_TYPE(trp) == TOKEN_FC_LLC) {
 187                 /* Try to print the LLC-layer header & higher layers */
 188                 if (llc_print(p, length, caplen, ESRC(&ehdr), EDST(&ehdr))
 189                     == 0) {
 190                         /* ether_type not known, print raw packet */
 191                         if (!eflag)
 192                                 token_print(trp, length,
 193                                     ESRC(&ehdr), EDST(&ehdr));
 194                         if (extracted_ethertype) {
 195                                 printf("(LLC %s) ",
 196                         etherproto_string(htons(extracted_ethertype)));
 197                         }
 198                         if (!xflag && !qflag)
 199                                 default_print(p, caplen);
 200                 }
 201         } else {
 202                 /* Some kinds of TR packet we cannot handle intelligently */
 203                 /* XXX - dissect MAC packets if frame type is 0 */
 204                 if (!eflag)
 205                         token_print(trp, length, ESRC(&ehdr), EDST(&ehdr));
 206                 if (!xflag && !qflag)
 207                         default_print(p, caplen);
 208         }
 209         if (xflag)
 210                 default_print(p, caplen);
 211 out:
 212         putchar('\n');
 213 }