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 1.8 2000-09-28 06:42:56 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 #include <netinet/in_systm.h>
  43
  44 #include <ctype.h>
  45 #include <netdb.h>
  46 #include <pcap.h>
  47 #include <stdio.h>
  48 #ifdef __bsdi__
  49 #include <net/slcompress.h>
  50 #include <net/if_ppp.h>
  51 #endif
  52
  53 #include "interface.h"
  54 #include "addrtoname.h"
  55 #include "ethertype.h"
  56 #include "ppp.h"
  57 #include "chdlc.h"
  58
  59 static void chdlc_slarp_print(const u_char *, u_int);
  60
  61 /* Standard CHDLC printer */
  62 void
  63 chdlc_if_print(u_char *user, const struct pcap_pkthdr *h,
  64              register const u_char *p)
  65 {
  66         register u_int length = h->len;
  67         register u_int caplen = h->caplen;
  68         const struct ip *ip;
  69         u_int proto;
  70
  71         ts_print(&h->ts);
  72
  73         if (caplen < CHDLC_HDRLEN) {
  74                 printf("[|chdlc]");
  75                 goto out;
  76         }
  77
  78         /*
  79          * Some printers want to get back at the link level addresses,
  80          * and/or check that they're not walking off the end of the packet.
  81          * Rather than pass them all the way down, we set these globals.
  82          */
  83         proto = ntohs(*(u_short *)&p[2]);
  84         packetp = p;
  85         snapend = p + caplen;
  86
  87         if (eflag) {
  88                 switch (p[0]) {
  89                 case CHDLC_UNICAST:
  90                         printf("unicast ");
  91                         break;
  92                 case CHDLC_BCAST:
  93                         printf("bcast ");
  94                         break;
  95                 default:
  96                         printf("0x%02x ", p[0]);
  97                         break;
  98                 }
  99                 printf("%d %04x: ", length, proto);
 100         }
 101
 102         length -= CHDLC_HDRLEN;
 103         ip = (struct ip *)(p + CHDLC_HDRLEN);
 104         switch (proto) {
 105         case ETHERTYPE_IP:
 106                 ip_print((const u_char *)ip, length);
 107                 break;
 108 #ifdef INET6
 109         case ETHERTYPE_IPV6:
 110                 ip6_print((const u_char *)ip, length);
 111                 break;
 112 #endif
 113         case CHDLC_TYPE_SLARP:
 114                 chdlc_slarp_print((const u_char *)ip, length);
 115                 break;
 116 #if 0
 117         case CHDLC_TYPE_CDP:
 118                 chdlc_cdp_print((const u_char *)ip, length);
 119                 break;
 120 #endif
 121         }
 122         if (xflag)
 123                 default_print((const u_char *)ip, caplen - CHDLC_HDRLEN);
 124 out:
 125         putchar('\n');
 126 }
 127
 128 struct cisco_slarp {
 129         long code;
 130 #define SLARP_REQUEST   0
 131 #define SLARP_REPLY     1
 132 #define SLARP_KEEPALIVE 2
 133         union {
 134                 struct {
 135                         struct in_addr addr;
 136                         struct in_addr mask;
 137                         u_short unused[3];
 138                 } addr;
 139                 struct {
 140                         long myseq;
 141                         long yourseq;
 142                         short rel;
 143                         short t1;
 144                         short t2;
 145                 } keep;
 146         } un;
 147 };
 148
 149 #define SLARP_LEN       18
 150
 151 static void
 152 chdlc_slarp_print(const u_char *cp, u_int length)
 153 {
 154         struct cisco_slarp *slarp;
 155
 156         if (length < SLARP_LEN) {
 157                 printf("[|slarp]");
 158                 return;
 159         }
 160
 161         slarp = (struct cisco_slarp *)cp;
 162         switch (ntohl(slarp->code)) {
 163         case SLARP_REQUEST:
 164                 printf("slarp-request");
 165                 break;
 166         case SLARP_REPLY:
 167                 printf("slarp-reply %s/%s",
 168                         ipaddr_string(&slarp->un.addr.addr),
 169                         ipaddr_string(&slarp->un.addr.mask));
 170                 break;
 171         case SLARP_KEEPALIVE:
 172                 printf("slarp-keepalive my=0x%x your=0x%x ",
 173                         (u_int32_t)ntohl(slarp->un.keep.myseq),
 174                         (u_int32_t)ntohl(slarp->un.keep.yourseq));
 175                 printf("reliability=0x%04x t1=%d.%d",
 176                         ntohs(slarp->un.keep.rel), ntohs(slarp->un.keep.t1),
 177                         ntohs(slarp->un.keep.t2));
 178                 break;
 179         default:
 180                 printf("slarp-0x%x unknown", (u_int32_t)ntohl(slarp->code));
 181                 break;
 182         }
 183
 184         if (SLARP_LEN < length && vflag)
 185                 printf("(trailing junk: %d bytes)", length - SLARP_LEN);
 186 }