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 1.2 1999-11-21 09:36:56 fenner 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/if_ether.h>
  41 #include <netinet/in_systm.h>
  42 #include <netinet/ip.h>
  43 #include <netinet/ip_var.h>
  44 #include <netinet/udp.h>
  45 #include <netinet/udp_var.h>
  46 #include <netinet/tcp.h>
  47 #include <netinet/tcpip.h>
  48
  49 #include <stdio.h>
  50 #include <pcap.h>
  51
  52 #include "interface.h"
  53 #include "addrtoname.h"
  54 #include "lane.h"
  55
  56 static const u_char *packetp;
  57 static const u_char *snapend;
  58
  59 static inline void
  60 lane_print(register const u_char *bp, int length)
  61 {
  62         register const struct lecdatahdr_8023 *ep;
  63
  64         ep = (const struct lecdatahdr_8023 *)bp;
  65         if (qflag)
  66                 (void)printf("lecid:%d %s %s %d: ",
  67                              ntohs(ep->le_header),
  68                              etheraddr_string(ep->h_source),
  69                              etheraddr_string(ep->h_dest),
  70                              length);
  71         else
  72                 (void)printf("lecid:%d %s %s %s %d: ",
  73                              ntohs(ep->le_header),
  74                              etheraddr_string(ep->h_source),
  75                              etheraddr_string(ep->h_dest),
  76                              etherproto_string(ep->h_type),
  77                              length);
  78 }
  79
  80 /*
  81  * This is the top level routine of the printer.  'p' is the points
  82  * to the ether header of the packet, 'h->tv' is the timestamp,
  83  * 'h->length' is the length of the packet off the wire, and 'h->caplen'
  84  * is the number of bytes actually captured.
  85  */
  86 void
  87 lane_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
  88 {
  89         int caplen = h->caplen;
  90         int length = h->len;
  91         struct lecdatahdr_8023 *ep;
  92         u_short ether_type;
  93         u_short extracted_ethertype;
  94
  95         ts_print(&h->ts);
  96
  97         if (caplen < sizeof(struct lecdatahdr_8023)) {
  98                 printf("[|lane]");
  99                 goto out;
 100         }
 101
 102         if (eflag)
 103                 lane_print(p, length);
 104
 105         /*
 106          * Some printers want to get back at the ethernet addresses,
 107          * and/or check that they're not walking off the end of the packet.
 108          * Rather than pass them all the way down, we set these globals.
 109          */
 110         packetp = p;
 111         snapend = p + caplen;
 112
 113         length -= sizeof(struct lecdatahdr_8023);
 114         caplen -= sizeof(struct lecdatahdr_8023);
 115         ep = (struct lecdatahdr_8023 *)p;
 116         p += sizeof(struct lecdatahdr_8023);
 117
 118         ether_type = ntohs(ep->h_type);
 119
 120         /*
 121          * Is it (gag) an 802.3 encapsulation?
 122          */
 123         extracted_ethertype = 0;
 124         if (ether_type < ETHERMTU) {
 125                 /* Try to print the LLC-layer header & higher layers */
 126                 if (llc_print(p, length, caplen, ep->h_source,ep->h_dest)==0) {
 127                         /* ether_type not known, print raw packet */
 128                         if (!eflag)
 129                                 lane_print((u_char *)ep, length);
 130                         if (extracted_ethertype) {
 131                                 printf("(LLC %s) ",
 132                                etherproto_string(htons(extracted_ethertype)));
 133                         }
 134                         if (!xflag && !qflag)
 135                                 default_print(p, caplen);
 136                 }
 137         } else if (ether_encap_print(ether_type, p, length, caplen) == 0) {
 138                 /* ether_type not known, print raw packet */
 139                 if (!eflag)
 140                         lane_print((u_char *)ep, length + sizeof(*ep));
 141                 if (!xflag && !qflag)
 142                         default_print(p, caplen);
 143         }
 144         if (xflag)
 145                 default_print(p, caplen);
 146  out:
 147         putchar('\n');
 148 }