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 1.1 1999-11-21 03:52:11 assar Exp $ (LBL)";
  26 #endif
  27
  28 #include <sys/param.h>
  29 #include <sys/time.h>
  30 #include <sys/types.h>
  31 #include <sys/socket.h>
  32
  33 #include <net/if.h>
  34
  35 #include <netinet/in.h>
  36 #include <netinet/if_ether.h>
  37 #include <netinet/in_systm.h>
  38 #include <netinet/ip.h>
  39 #include <netinet/ip_var.h>
  40 #include <netinet/udp.h>
  41 #include <netinet/udp_var.h>
  42 #include <netinet/tcp.h>
  43 #include <netinet/tcpip.h>
  44
  45 #include <stdio.h>
  46 #include <pcap.h>
  47
  48 #include "interface.h"
  49 #include "addrtoname.h"
  50 #include "lane.h"
  51
  52 static const u_char *packetp;
  53 static const u_char *snapend;
  54
  55 static inline void
  56 lane_print(register const u_char *bp, int length)
  57 {
  58         register const struct lecdatahdr_8023 *ep;
  59
  60         ep = (const struct lecdatahdr_8023 *)bp;
  61         if (qflag)
  62                 (void)printf("lecid:%d %s %s %d: ",
  63                              ntohs(ep->le_header),
  64                              etheraddr_string(ep->h_source),
  65                              etheraddr_string(ep->h_dest),
  66                              length);
  67         else
  68                 (void)printf("lecid:%d %s %s %s %d: ",
  69                              ntohs(ep->le_header),
  70                              etheraddr_string(ep->h_source),
  71                              etheraddr_string(ep->h_dest),
  72                              etherproto_string(ep->h_type),
  73                              length);
  74 }
  75
  76 /*
  77  * This is the top level routine of the printer.  'p' is the points
  78  * to the ether header of the packet, 'h->tv' is the timestamp,
  79  * 'h->length' is the length of the packet off the wire, and 'h->caplen'
  80  * is the number of bytes actually captured.
  81  */
  82 void
  83 lane_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
  84 {
  85         int caplen = h->caplen;
  86         int length = h->len;
  87         struct lecdatahdr_8023 *ep;
  88         u_short ether_type;
  89         u_short extracted_ethertype;
  90
  91         ts_print(&h->ts);
  92
  93         if (caplen < sizeof(struct lecdatahdr_8023)) {
  94                 printf("[|lane]");
  95                 goto out;
  96         }
  97
  98         if (eflag)
  99                 lane_print(p, length);
 100
 101         /*
 102          * Some printers want to get back at the ethernet addresses,
 103          * and/or check that they're not walking off the end of the packet.
 104          * Rather than pass them all the way down, we set these globals.
 105          */
 106         packetp = p;
 107         snapend = p + caplen;
 108
 109         length -= sizeof(struct lecdatahdr_8023);
 110         caplen -= sizeof(struct lecdatahdr_8023);
 111         ep = (struct lecdatahdr_8023 *)p;
 112         p += sizeof(struct lecdatahdr_8023);
 113
 114         ether_type = ntohs(ep->h_type);
 115
 116         /*
 117          * Is it (gag) an 802.3 encapsulation?
 118          */
 119         extracted_ethertype = 0;
 120         if (ether_type < ETHERMTU) {
 121                 /* Try to print the LLC-layer header & higher layers */
 122                 if (llc_print(p, length, caplen, ep->h_source,ep->h_dest)==0) {
 123                         /* ether_type not known, print raw packet */
 124                         if (!eflag)
 125                                 lane_print((u_char *)ep, length);
 126                         if (extracted_ethertype) {
 127                                 printf("(LLC %s) ",
 128                                etherproto_string(htons(extracted_ethertype)));
 129                         }
 130                         if (!xflag && !qflag)
 131                                 default_print(p, caplen);
 132                 }
 133         } else if (ether_encap_print(ether_type, p, length, caplen) == 0) {
 134                 /* ether_type not known, print raw packet */
 135                 if (!eflag)
 136                         lane_print((u_char *)ep, length + sizeof(*ep));
 137                 if (!xflag && !qflag)
 138                         default_print(p, caplen);
 139         }
 140         if (xflag)
 141                 default_print(p, caplen);
 142  out:
 143         putchar('\n');
 144 }