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 1.6 2000-09-23 08:26:36 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 #include <net/if.h>
  38
  39 #include <netinet/in.h>
  40 #include <netinet/in_systm.h>
  41 #include <netinet/ip.h>
  42 #include <netinet/ip_var.h>
  43
  44 #include <stdio.h>
  45 #include <pcap.h>
  46
  47 #include "interface.h"
  48 #include "addrtoname.h"
  49 #include "ether.h"
  50 #include "lane.h"
  51
  52 static inline void
  53 lane_print(register const u_char *bp, int length)
  54 {
  55         register const struct lecdatahdr_8023 *ep;
  56
  57         ep = (const struct lecdatahdr_8023 *)bp;
  58         if (qflag)
  59                 (void)printf("lecid:%d %s %s %d: ",
  60                              ntohs(ep->le_header),
  61                              etheraddr_string(ep->h_source),
  62                              etheraddr_string(ep->h_dest),
  63                              length);
  64         else
  65                 (void)printf("lecid:%d %s %s %s %d: ",
  66                              ntohs(ep->le_header),
  67                              etheraddr_string(ep->h_source),
  68                              etheraddr_string(ep->h_dest),
  69                              etherproto_string(ep->h_type),
  70                              length);
  71 }
  72
  73 /*
  74  * This is the top level routine of the printer.  'p' is the points
  75  * to the ether header of the packet, 'h->tv' is the timestamp,
  76  * 'h->length' is the length of the packet off the wire, and 'h->caplen'
  77  * is the number of bytes actually captured.
  78  */
  79 void
  80 lane_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
  81 {
  82         int caplen = h->caplen;
  83         int length = h->len;
  84         struct lecdatahdr_8023 *ep;
  85         u_short ether_type;
  86         u_short extracted_ethertype;
  87
  88         ts_print(&h->ts);
  89
  90         if (caplen < sizeof(struct lecdatahdr_8023)) {
  91                 printf("[|lane]");
  92                 goto out;
  93         }
  94
  95         if (eflag)
  96                 lane_print(p, length);
  97
  98         /*
  99          * Some printers want to get back at the ethernet addresses,
 100          * and/or check that they're not walking off the end of the packet.
 101          * Rather than pass them all the way down, we set these globals.
 102          */
 103         packetp = p;
 104         snapend = p + caplen;
 105
 106         length -= sizeof(struct lecdatahdr_8023);
 107         caplen -= sizeof(struct lecdatahdr_8023);
 108         ep = (struct lecdatahdr_8023 *)p;
 109         p += sizeof(struct lecdatahdr_8023);
 110
 111         ether_type = ntohs(ep->h_type);
 112
 113         /*
 114          * Is it (gag) an 802.3 encapsulation?
 115          */
 116         extracted_ethertype = 0;
 117         if (ether_type < ETHERMTU) {
 118                 /* Try to print the LLC-layer header & higher layers */
 119                 if (llc_print(p, length, caplen, ep->h_source,ep->h_dest)==0) {
 120                         /* ether_type not known, print raw packet */
 121                         if (!eflag)
 122                                 lane_print((u_char *)ep, length);
 123                         if (extracted_ethertype) {
 124                                 printf("(LLC %s) ",
 125                                etherproto_string(htons(extracted_ethertype)));
 126                         }
 127                         if (!xflag && !qflag)
 128                                 default_print(p, caplen);
 129                 }
 130         } else if (ether_encap_print(ether_type, p, length, caplen) == 0) {
 131                 /* ether_type not known, print raw packet */
 132                 if (!eflag)
 133                         lane_print((u_char *)ep, length + sizeof(*ep));
 134                 if (!xflag && !qflag)
 135                         default_print(p, caplen);
 136         }
 137         if (xflag)
 138                 default_print(p, caplen);
 139  out:
 140         putchar('\n');
 141 }