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 1.10 2000-12-18 05:42:00 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 inline void
  49 lane_print(register const u_char *bp, int length)
  50 {
  51         register const struct lecdatahdr_8023 *ep;
  52
  53         ep = (const struct lecdatahdr_8023 *)bp;
  54         if (qflag)
  55                 (void)printf("lecid:%d %s %s %d: ",
  56                              ntohs(ep->le_header),
  57                              etheraddr_string(ep->h_source),
  58                              etheraddr_string(ep->h_dest),
  59                              length);
  60         else
  61                 (void)printf("lecid:%d %s %s %s %d: ",
  62                              ntohs(ep->le_header),
  63                              etheraddr_string(ep->h_source),
  64                              etheraddr_string(ep->h_dest),
  65                              etherproto_string(ep->h_type),
  66                              length);
  67 }
  68
  69 /*
  70  * This is the top level routine of the printer.  'p' is the points
  71  * to the ether header of the packet, 'h->tv' is the timestamp,
  72  * 'h->length' is the length of the packet off the wire, and 'h->caplen'
  73  * is the number of bytes actually captured.
  74  */
  75 void
  76 lane_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
  77 {
  78         int caplen = h->caplen;
  79         int length = h->len;
  80         struct lecdatahdr_8023 *ep;
  81         u_short ether_type;
  82         u_short extracted_ethertype;
  83
  84         ts_print(&h->ts);
  85
  86         if (caplen < sizeof(struct lecdatahdr_8023)) {
  87                 printf("[|lane]");
  88                 goto out;
  89         }
  90
  91         if (eflag)
  92                 lane_print(p, length);
  93
  94         /*
  95          * Some printers want to get back at the ethernet addresses,
  96          * and/or check that they're not walking off the end of the packet.
  97          * Rather than pass them all the way down, we set these globals.
  98          */
  99         packetp = p;
 100         snapend = p + caplen;
 101
 102         length -= sizeof(struct lecdatahdr_8023);
 103         caplen -= sizeof(struct lecdatahdr_8023);
 104         ep = (struct lecdatahdr_8023 *)p;
 105         p += sizeof(struct lecdatahdr_8023);
 106
 107         ether_type = ntohs(ep->h_type);
 108
 109         /*
 110          * Is it (gag) an 802.3 encapsulation?
 111          */
 112         extracted_ethertype = 0;
 113         if (ether_type < ETHERMTU) {
 114                 /* Try to print the LLC-layer header & higher layers */
 115                 if (llc_print(p, length, caplen, ep->h_source, ep->h_dest,
 116                     &extracted_ethertype) == 0) {
 117                         /* ether_type not known, print raw packet */
 118                         if (!eflag)
 119                                 lane_print((u_char *)ep, length);
 120                         if (extracted_ethertype) {
 121                                 printf("(LLC %s) ",
 122                                etherproto_string(htons(extracted_ethertype)));
 123                         }
 124                         if (!xflag && !qflag)
 125                                 default_print(p, caplen);
 126                 }
 127         } else if (ether_encap_print(ether_type, p, length, caplen,
 128             &extracted_ethertype) == 0) {
 129                 /* ether_type not known, print raw packet */
 130                 if (!eflag)
 131                         lane_print((u_char *)ep, length + sizeof(*ep));
 132                 if (!xflag && !qflag)
 133                         default_print(p, caplen);
 134         }
 135         if (xflag)
 136                 default_print(p, caplen);
 137  out:
 138         putchar('\n');
 139 }