The Tcpdump Group git mirrors - tcpdump/blob - print-chdlc.c

   1 /* maybe it should be merged into print-ppp.c */
   2 /*
   3  * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997
   4  *      The Regents of the University of California.  All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that: (1) source code distributions
   8  * retain the above copyright notice and this paragraph in its entirety, (2)
   9  * distributions including binary code include the above copyright notice and
  10  * this paragraph in its entirety in the documentation or other materials
  11  * provided with the distribution, and (3) all advertising materials mentioning
  12  * features or use of this software display the following acknowledgement:
  13  * ``This product includes software developed by the University of California,
  14  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  15  * the University nor the names of its contributors may be used to endorse
  16  * or promote products derived from this software without specific prior
  17  * written permission.
  18  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  19  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  20  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  21  */
  22
  23 #ifndef lint
  24 static const char rcsid[] =
  25     "@(#) $Header: /tcpdump/master/tcpdump/print-chdlc.c,v 1.9 2000-09-29 04:58:35 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/socket.h>
  35 #include <sys/file.h>
  36 #include <sys/ioctl.h>
  37
  38 struct mbuf;
  39 struct rtentry;
  40
  41 #include <netinet/in.h>
  42
  43 #include <ctype.h>
  44 #include <netdb.h>
  45 #include <pcap.h>
  46 #include <stdio.h>
  47 #ifdef __bsdi__
  48 #include <net/slcompress.h>
  49 #include <net/if_ppp.h>
  50 #endif
  51
  52 #include "interface.h"
  53 #include "addrtoname.h"
  54 #include "ethertype.h"
  55 #include "ppp.h"
  56 #include "chdlc.h"
  57
  58 static void chdlc_slarp_print(const u_char *, u_int);
  59
  60 /* Standard CHDLC printer */
  61 void
  62 chdlc_if_print(u_char *user, const struct pcap_pkthdr *h,
  63              register const u_char *p)
  64 {
  65         register u_int length = h->len;
  66         register u_int caplen = h->caplen;
  67         const struct ip *ip;
  68         u_int proto;
  69
  70         ts_print(&h->ts);
  71
  72         if (caplen < CHDLC_HDRLEN) {
  73                 printf("[|chdlc]");
  74                 goto out;
  75         }
  76
  77         /*
  78          * Some printers want to get back at the link level addresses,
  79          * and/or check that they're not walking off the end of the packet.
  80          * Rather than pass them all the way down, we set these globals.
  81          */
  82         proto = ntohs(*(u_short *)&p[2]);
  83         packetp = p;
  84         snapend = p + caplen;
  85
  86         if (eflag) {
  87                 switch (p[0]) {
  88                 case CHDLC_UNICAST:
  89                         printf("unicast ");
  90                         break;
  91                 case CHDLC_BCAST:
  92                         printf("bcast ");
  93                         break;
  94                 default:
  95                         printf("0x%02x ", p[0]);
  96                         break;
  97                 }
  98                 printf("%d %04x: ", length, proto);
  99         }
 100
 101         length -= CHDLC_HDRLEN;
 102         ip = (struct ip *)(p + CHDLC_HDRLEN);
 103         switch (proto) {
 104         case ETHERTYPE_IP:
 105                 ip_print((const u_char *)ip, length);
 106                 break;
 107 #ifdef INET6
 108         case ETHERTYPE_IPV6:
 109                 ip6_print((const u_char *)ip, length);
 110                 break;
 111 #endif
 112         case CHDLC_TYPE_SLARP:
 113                 chdlc_slarp_print((const u_char *)ip, length);
 114                 break;
 115 #if 0
 116         case CHDLC_TYPE_CDP:
 117                 chdlc_cdp_print((const u_char *)ip, length);
 118                 break;
 119 #endif
 120         }
 121         if (xflag)
 122                 default_print((const u_char *)ip, caplen - CHDLC_HDRLEN);
 123 out:
 124         putchar('\n');
 125 }
 126
 127 struct cisco_slarp {
 128         long code;
 129 #define SLARP_REQUEST   0
 130 #define SLARP_REPLY     1
 131 #define SLARP_KEEPALIVE 2
 132         union {
 133                 struct {
 134                         struct in_addr addr;
 135                         struct in_addr mask;
 136                         u_short unused[3];
 137                 } addr;
 138                 struct {
 139                         long myseq;
 140                         long yourseq;
 141                         short rel;
 142                         short t1;
 143                         short t2;
 144                 } keep;
 145         } un;
 146 };
 147
 148 #define SLARP_LEN       18
 149
 150 static void
 151 chdlc_slarp_print(const u_char *cp, u_int length)
 152 {
 153         struct cisco_slarp *slarp;
 154
 155         if (length < SLARP_LEN) {
 156                 printf("[|slarp]");
 157                 return;
 158         }
 159
 160         slarp = (struct cisco_slarp *)cp;
 161         switch (ntohl(slarp->code)) {
 162         case SLARP_REQUEST:
 163                 printf("slarp-request");
 164                 break;
 165         case SLARP_REPLY:
 166                 printf("slarp-reply %s/%s",
 167                         ipaddr_string(&slarp->un.addr.addr),
 168                         ipaddr_string(&slarp->un.addr.mask));
 169                 break;
 170         case SLARP_KEEPALIVE:
 171                 printf("slarp-keepalive my=0x%x your=0x%x ",
 172                         (u_int32_t)ntohl(slarp->un.keep.myseq),
 173                         (u_int32_t)ntohl(slarp->un.keep.yourseq));
 174                 printf("reliability=0x%04x t1=%d.%d",
 175                         ntohs(slarp->un.keep.rel), ntohs(slarp->un.keep.t1),
 176                         ntohs(slarp->un.keep.t2));
 177                 break;
 178         default:
 179                 printf("slarp-0x%x unknown", (u_int32_t)ntohl(slarp->code));
 180                 break;
 181         }
 182
 183         if (SLARP_LEN < length && vflag)
 184                 printf("(trailing junk: %d bytes)", length - SLARP_LEN);
 185 }