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 1.16 2002-09-05 21:25:43 guy Exp $ (LBL)";
  26 #endif
  27
  28 #ifdef HAVE_CONFIG_H
  29 #include "config.h"
  30 #endif
  31
  32 #include <tcpdump-stdinc.h>
  33
  34 #include <stdio.h>
  35 #include <pcap.h>
  36
  37 #include "interface.h"
  38 #include "addrtoname.h"
  39 #include "ether.h"
  40 #include "lane.h"
  41
  42 static const struct tok lecop2str[] = {
  43         { 0x0001,       "configure request" },
  44         { 0x0101,       "configure response" },
  45         { 0x0002,       "join request" },
  46         { 0x0102,       "join response" },
  47         { 0x0003,       "ready query" },
  48         { 0x0103,       "ready indication" },
  49         { 0x0004,       "register request" },
  50         { 0x0104,       "register response" },
  51         { 0x0005,       "unregister request" },
  52         { 0x0105,       "unregister response" },
  53         { 0x0006,       "ARP request" },
  54         { 0x0106,       "ARP response" },
  55         { 0x0007,       "flush request" },
  56         { 0x0107,       "flush response" },
  57         { 0x0008,       "NARP request" },
  58         { 0x0009,       "topology request" },
  59         { 0,            NULL }
  60 };
  61
  62 static inline void
  63 lane_hdr_print(register const u_char *bp, int length)
  64 {
  65         register const struct lecdatahdr_8023 *ep;
  66
  67         ep = (const struct lecdatahdr_8023 *)bp;
  68         if (qflag)
  69                 (void)printf("lecid:%x %s %s %d: ",
  70                              ntohs(ep->le_header),
  71                              etheraddr_string(ep->h_source),
  72                              etheraddr_string(ep->h_dest),
  73                              length);
  74         else
  75                 (void)printf("lecid:%x %s %s %s %d: ",
  76                              ntohs(ep->le_header),
  77                              etheraddr_string(ep->h_source),
  78                              etheraddr_string(ep->h_dest),
  79                              etherproto_string(ep->h_type),
  80                              length);
  81 }
  82
  83 /*
  84  * This is the top level routine of the printer.  'p' points
  85  * to the LANE header of the packet, 'h->ts' is the timestamp,
  86  * 'h->length' is the length of the packet off the wire, and 'h->caplen'
  87  * is the number of bytes actually captured.
  88  *
  89  * This assumes 802.3, not 802.5, LAN emulation.
  90  */
  91 void
  92 lane_print(const u_char *p, u_int length, u_int caplen)
  93 {
  94         struct lane_controlhdr *lec;
  95         struct lecdatahdr_8023 *ep;
  96         u_short ether_type;
  97         u_short extracted_ethertype;
  98
  99         if (caplen < sizeof(struct lane_controlhdr)) {
 100                 printf("[|lane]");
 101                 return;
 102         }
 103
 104         lec = (struct lane_controlhdr *)p;
 105         if (ntohs(lec->lec_header) == 0xff00) {
 106                 /*
 107                  * LE Control.
 108                  */
 109                 printf("lec: proto %x vers %x %s",
 110                     lec->lec_proto, lec->lec_vers,
 111                     tok2str(lecop2str, "opcode-#%u", ntohs(lec->lec_opcode)));
 112                 return;
 113         }
 114
 115         if (caplen < sizeof(struct lecdatahdr_8023)) {
 116                 printf("[|lane]");
 117                 return;
 118         }
 119
 120         if (eflag)
 121                 lane_hdr_print(p, length);
 122
 123         /*
 124          * Some printers want to get back at the ethernet addresses,
 125          * and/or check that they're not walking off the end of the packet.
 126          * Rather than pass them all the way down, we set these globals.
 127          */
 128         packetp = p + 2;        /* skip the LECID */
 129         snapend = p + caplen;
 130
 131         length -= sizeof(struct lecdatahdr_8023);
 132         caplen -= sizeof(struct lecdatahdr_8023);
 133         ep = (struct lecdatahdr_8023 *)p;
 134         p += sizeof(struct lecdatahdr_8023);
 135
 136         ether_type = ntohs(ep->h_type);
 137
 138         /*
 139          * Is it (gag) an 802.3 encapsulation?
 140          */
 141         extracted_ethertype = 0;
 142         if (ether_type <= ETHERMTU) {
 143                 /* Try to print the LLC-layer header & higher layers */
 144                 if (llc_print(p, length, caplen, ep->h_source, ep->h_dest,
 145                     &extracted_ethertype) == 0) {
 146                         /* ether_type not known, print raw packet */
 147                         if (!eflag)
 148                                 lane_hdr_print((u_char *)ep, length + sizeof(*ep));
 149                         if (extracted_ethertype) {
 150                                 printf("(LLC %s) ",
 151                                etherproto_string(htons(extracted_ethertype)));
 152                         }
 153                         if (!xflag && !qflag)
 154                                 default_print(p, caplen);
 155                 }
 156         } else if (ether_encap_print(ether_type, p, length, caplen,
 157             &extracted_ethertype) == 0) {
 158                 /* ether_type not known, print raw packet */
 159                 if (!eflag)
 160                         lane_hdr_print((u_char *)ep, length + sizeof(*ep));
 161                 if (!xflag && !qflag)
 162                         default_print(p, caplen);
 163         }
 164         if (xflag)
 165                 default_print(p, caplen);
 166 }
 167
 168 void
 169 lane_if_print(u_char *user _U_, const struct pcap_pkthdr *h, const u_char *p)
 170 {
 171         int caplen = h->caplen;
 172         int length = h->len;
 173
 174         ++infodelay;
 175         ts_print(&h->ts);
 176
 177         lane_print(p, length, caplen);
 178
 179         putchar('\n');
 180         --infodelay;
 181         if (infoprint)
 182                 info(0);
 183 }