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

   1 /*
   2  * Marko Kiiskila carnil@cs.tut.fi
   3  *
   4  * Tampere University of Technology - Telecommunications Laboratory
   5  *
   6  * Permission to use, copy, modify and distribute this
   7  * software and its documentation is hereby granted,
   8  * provided that both the copyright notice and this
   9  * permission notice appear in all copies of the software,
  10  * derivative works or modified versions, and any portions
  11  * thereof, that both notices appear in supporting
  12  * documentation, and that the use of this software is
  13  * acknowledged in any publications resulting from using
  14  * the software.
  15  *
  16  * TUT ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  17  * CONDITION AND DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  18  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS
  19  * SOFTWARE.
  20  *
  21  */
  22
  23 #ifndef lint
  24 static const char rcsid[] =
  25     "@(#) $Header: /tcpdump/master/tcpdump/print-lane.c,v 1.14 2002-07-11 09:17:24 guy Exp $ (LBL)";
  26 #endif
  27
  28 #ifdef HAVE_CONFIG_H
  29 #include "config.h"
  30 #endif
  31
  32 #include <sys/param.h>
  33 #include <sys/time.h>
  34 #include <sys/types.h>
  35 #include <sys/socket.h>
  36
  37
  38 #include <netinet/in.h>
  39
  40 #include <stdio.h>
  41 #include <pcap.h>
  42
  43 #include "interface.h"
  44 #include "addrtoname.h"
  45 #include "ether.h"
  46 #include "lane.h"
  47
  48 static const struct tok lecop2str[] = {
  49         { 0x0001,       "configure request" },
  50         { 0x0101,       "configure response" },
  51         { 0x0002,       "join request" },
  52         { 0x0102,       "join response" },
  53         { 0x0003,       "ready query" },
  54         { 0x0103,       "ready indication" },
  55         { 0x0004,       "register request" },
  56         { 0x0104,       "register response" },
  57         { 0x0005,       "unregister request" },
  58         { 0x0105,       "unregister response" },
  59         { 0x0006,       "ARP request" },
  60         { 0x0106,       "ARP response" },
  61         { 0x0007,       "flush request" },
  62         { 0x0107,       "flush response" },
  63         { 0x0008,       "NARP request" },
  64         { 0x0009,       "topology request" },
  65         { 0,            NULL }
  66 };
  67
  68 static inline void
  69 lane_hdr_print(register const u_char *bp, int length)
  70 {
  71         register const struct lecdatahdr_8023 *ep;
  72
  73         ep = (const struct lecdatahdr_8023 *)bp;
  74         if (qflag)
  75                 (void)printf("lecid:%x %s %s %d: ",
  76                              ntohs(ep->le_header),
  77                              etheraddr_string(ep->h_source),
  78                              etheraddr_string(ep->h_dest),
  79                              length);
  80         else
  81                 (void)printf("lecid:%x %s %s %s %d: ",
  82                              ntohs(ep->le_header),
  83                              etheraddr_string(ep->h_source),
  84                              etheraddr_string(ep->h_dest),
  85                              etherproto_string(ep->h_type),
  86                              length);
  87 }
  88
  89 /*
  90  * This is the top level routine of the printer.  'p' is the points
  91  * to the ether header of the packet, 'h->tv' is the timestamp,
  92  * 'h->length' is the length of the packet off the wire, and 'h->caplen'
  93  * is the number of bytes actually captured.
  94  *
  95  * This assumes 802.3, not 802.5, LAN emulation.
  96  */
  97 void
  98 lane_print(const u_char *p, u_int length, u_int caplen)
  99 {
 100         struct lane_controlhdr *lec;
 101         struct lecdatahdr_8023 *ep;
 102         u_short ether_type;
 103         u_short extracted_ethertype;
 104
 105         if (caplen < sizeof(struct lane_controlhdr)) {
 106                 printf("[|lane]");
 107                 return;
 108         }
 109
 110         lec = (struct lane_controlhdr *)p;
 111         if (ntohs(lec->lec_header) == 0xff00) {
 112                 /*
 113                  * LE Control.
 114                  */
 115                 printf("lec: proto %x vers %x %s",
 116                     lec->lec_proto, lec->lec_vers,
 117                     tok2str(lecop2str, "opcode-#%u", ntohs(lec->lec_opcode)));
 118                 return;
 119         }
 120
 121         if (caplen < sizeof(struct lecdatahdr_8023)) {
 122                 printf("[|lane]");
 123                 return;
 124         }
 125
 126         if (eflag)
 127                 lane_hdr_print(p, length);
 128
 129         /*
 130          * Some printers want to get back at the ethernet addresses,
 131          * and/or check that they're not walking off the end of the packet.
 132          * Rather than pass them all the way down, we set these globals.
 133          */
 134         packetp = p + 2;        /* skip the LECID */
 135         snapend = p + caplen;
 136
 137         length -= sizeof(struct lecdatahdr_8023);
 138         caplen -= sizeof(struct lecdatahdr_8023);
 139         ep = (struct lecdatahdr_8023 *)p;
 140         p += sizeof(struct lecdatahdr_8023);
 141
 142         ether_type = ntohs(ep->h_type);
 143
 144         /*
 145          * Is it (gag) an 802.3 encapsulation?
 146          */
 147         extracted_ethertype = 0;
 148         if (ether_type <= ETHERMTU) {
 149                 /* Try to print the LLC-layer header & higher layers */
 150                 if (llc_print(p, length, caplen, ep->h_source, ep->h_dest,
 151                     &extracted_ethertype) == 0) {
 152                         /* ether_type not known, print raw packet */
 153                         if (!eflag)
 154                                 lane_hdr_print((u_char *)ep, length + sizeof(*ep));
 155                         if (extracted_ethertype) {
 156                                 printf("(LLC %s) ",
 157                                etherproto_string(htons(extracted_ethertype)));
 158                         }
 159                         if (!xflag && !qflag)
 160                                 default_print(p, caplen);
 161                 }
 162         } else if (ether_encap_print(ether_type, p, length, caplen,
 163             &extracted_ethertype) == 0) {
 164                 /* ether_type not known, print raw packet */
 165                 if (!eflag)
 166                         lane_hdr_print((u_char *)ep, length + sizeof(*ep));
 167                 if (!xflag && !qflag)
 168                         default_print(p, caplen);
 169         }
 170         if (xflag)
 171                 default_print(p, caplen);
 172 }
 173
 174 void
 175 lane_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
 176 {
 177         int caplen = h->caplen;
 178         int length = h->len;
 179
 180         ++infodelay;
 181         ts_print(&h->ts);
 182
 183         lane_print(p, length, caplen);
 184
 185         putchar('\n');
 186         --infodelay;
 187         if (infoprint)
 188                 info(0);
 189 }