dist/tcpdump/print-cip.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Marko Kiiskila carnil@cs.tut.fi
   5  *
   6  * Tampere University of Technology - Telecommunications Laboratory
   7  *
   8  * Permission to use, copy, modify and distribute this
   9  * software and its documentation is hereby granted,
  10  * provided that both the copyright notice and this
  11  * permission notice appear in all copies of the software,
  12  * derivative works or modified versions, and any portions
  13  * thereof, that both notices appear in supporting
  14  * documentation, and that the use of this software is
  15  * acknowledged in any publications resulting from using
  16  * the software.
  17  *
  18  * TUT ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  19  * CONDITION AND DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  20  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS
  21  * SOFTWARE.
  22  *
  23  */
  24
  25 #include <sys/cdefs.h>
  26 #ifndef lint
  27 #if 0
  28 static const char rcsid[] _U_ =
  29     "@(#) Header: /tcpdump/master/tcpdump/print-cip.c,v 1.25.2.1 2005/07/07 01:24:34 guy Exp (LBL)";
  30 #else
  31 __RCSID("$NetBSD: tcpdump2rcsid.ex,v 1.1 2001/06/25 20:09:58 itojun Exp $");
  32 #endif
  33 #endif
  34
  35 #ifdef HAVE_CONFIG_H
  36 #include "config.h"
  37 #endif
  38
  39 #include <string.h>
  40
  41 #include <tcpdump-stdinc.h>
  42
  43 #include <stdio.h>
  44 #include <pcap.h>
  45
  46 #include "interface.h"
  47 #include "addrtoname.h"
  48 #include "ethertype.h"
  49 #include "ether.h"
  50
  51 #define RFC1483LLC_LEN  8
  52
  53 static unsigned char rfcllc[] = {
  54         0xaa,   /* DSAP: non-ISO */
  55         0xaa,   /* SSAP: non-ISO */
  56         0x03,   /* Ctrl: Unnumbered Information Command PDU */
  57         0x00,   /* OUI: EtherType */
  58         0x00,
  59         0x00 };
  60
  61 static inline void
  62 cip_print(int length)
  63 {
  64         /*
  65          * There is no MAC-layer header, so just print the length.
  66          */
  67         printf("%d: ", length);
  68 }
  69
  70 /*
  71  * This is the top level routine of the printer.  'p' points
  72  * to the LLC/SNAP or raw header of the packet, 'h->ts' is the timestamp,
  73  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
  74  * is the number of bytes actually captured.
  75  */
  76 u_int
  77 cip_if_print(const struct pcap_pkthdr *h, const u_char *p)
  78 {
  79         u_int caplen = h->caplen;
  80         u_int length = h->len;
  81         u_short extracted_ethertype;
  82
  83         if (memcmp(rfcllc, p, sizeof(rfcllc))==0 && caplen < RFC1483LLC_LEN) {
  84                 printf("[|cip]");
  85                 return (0);
  86         }
  87
  88         if (eflag)
  89                 cip_print(length);
  90
  91         if (memcmp(rfcllc, p, sizeof(rfcllc)) == 0) {
  92                 /*
  93                  * LLC header is present.  Try to print it & higher layers.
  94                  */
  95                 if (llc_print(p, length, caplen, NULL, NULL,
  96                     &extracted_ethertype) == 0) {
  97                         /* ether_type not known, print raw packet */
  98                         if (!eflag)
  99                                 cip_print(length);
 100                         if (extracted_ethertype) {
 101                                 printf("(LLC %s) ",
 102                                etherproto_string(htons(extracted_ethertype)));
 103                         }
 104                         if (!suppress_default_print)
 105                                 default_print(p, caplen);
 106                 }
 107         } else {
 108                 /*
 109                  * LLC header is absent; treat it as just IP.
 110                  */
 111                 ip_print(gndo, p, length);
 112         }
 113
 114         return (0);
 115 }
 116
 117
 118 /*
 119  * Local Variables:
 120  * c-style: whitesmith
 121  * c-basic-offset: 8
 122  * End:
 123  */