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 1.1 1999-10-30 05:11:11 itojun Exp $ (LBL)";
  26 #endif
  27
  28 #include <sys/param.h>
  29 #include <sys/time.h>
  30 #include <sys/socket.h>
  31 #include <sys/file.h>
  32 #include <sys/ioctl.h>
  33
  34 #if __STDC__
  35 struct mbuf;
  36 struct rtentry;
  37 #endif
  38 #include <net/if.h>
  39
  40 #include <netinet/in.h>
  41 #include <netinet/in_systm.h>
  42 #include <netinet/ip.h>
  43 #include <netinet/if_ether.h>
  44
  45 #include <ctype.h>
  46 #include <netdb.h>
  47 #include <pcap.h>
  48 #include <stdio.h>
  49 #ifdef __bsdi__
  50 #include <net/slcompress.h>
  51 #include <net/if_ppp.h>
  52 #endif
  53
  54 #include "interface.h"
  55 #include "addrtoname.h"
  56 #include "ppp.h"
  57
  58 /* XXX This goes somewhere else. */
  59 #define CHDLC_HDRLEN 4
  60 #define CHDLC_UNICAST   0x0f
  61 #define CHDLC_BCAST     0x8f
  62 #define CHDLC_TYPE_SLARP        0x8035
  63 #define CHDLC_TYPE_CDP          0x2000
  64
  65 static void chdlc_slarp_print(const u_char *, u_int);
  66
  67 /* Standard CHDLC printer */
  68 void
  69 chdlc_if_print(u_char *user, const struct pcap_pkthdr *h,
  70              register const u_char *p)
  71 {
  72         register u_int length = h->len;
  73         register u_int caplen = h->caplen;
  74         const struct ip *ip;
  75         u_int proto;
  76
  77         ts_print(&h->ts);
  78
  79         if (caplen < CHDLC_HDRLEN) {
  80                 printf("[|chdlc]");
  81                 goto out;
  82         }
  83
  84         /*
  85          * Some printers want to get back at the link level addresses,
  86          * and/or check that they're not walking off the end of the packet.
  87          * Rather than pass them all the way down, we set these globals.
  88          */
  89         proto = ntohs(*(u_short *)&p[2]);
  90         packetp = p;
  91         snapend = p + caplen;
  92
  93         if (eflag) {
  94                 switch (p[0]) {
  95                 case CHDLC_UNICAST:
  96                         printf("unicast ");
  97                         break;
  98                 case CHDLC_BCAST:
  99                         printf("bcast ");
 100                         break;
 101                 default:
 102                         printf("0x%02x ", p[0]);
 103                         break;
 104                 }
 105                 printf("%d %04x: ", length, proto);
 106         }
 107
 108         length -= CHDLC_HDRLEN;
 109         ip = (struct ip *)(p + CHDLC_HDRLEN);
 110         switch(proto) {
 111         case ETHERTYPE_IP:
 112                 ip_print((const u_char *)ip, length);
 113                 break;
 114 #ifdef INET6
 115         case ETHERTYPE_IPV6:
 116                 ip6_print((const u_char *)ip, length);
 117                 break;
 118 #endif
 119         case CHDLC_TYPE_SLARP:
 120                 chdlc_slarp_print((const u_char *)ip, length);
 121                 break;
 122 #if 0
 123         case CHDLC_TYPE_CDP:
 124                 chdlc_cdp_print((const u_char *)ip, length);
 125                 break;
 126 #endif
 127         }
 128         if (xflag)
 129                 default_print((const u_char *)ip, caplen - CHDLC_HDRLEN);
 130 out:
 131         putchar('\n');
 132 }
 133
 134 struct cisco_slarp {
 135         long code;
 136 #define SLARP_REQUEST   0
 137 #define SLARP_REPLY     1
 138 #define SLARP_KEEPALIVE 2
 139         union {
 140                 struct {
 141                         struct in_addr addr;
 142                         struct in_addr mask;
 143                         u_short unused[3];
 144                 } addr;
 145                 struct {
 146                         long myseq;
 147                         long yourseq;
 148                         short rel;
 149                         short t1;
 150                         short t2;
 151                 } keep;
 152         } un;
 153 };
 154
 155 #define SLARP_LEN       18
 156
 157 static void
 158 chdlc_slarp_print(const u_char *cp, u_int length)
 159 {
 160         struct cisco_slarp *slarp;
 161
 162         if (length < SLARP_LEN) {
 163                 printf("[|slarp]");
 164                 return;
 165         }
 166
 167         slarp = (struct cisco_slarp *)cp;
 168         switch (ntohl(slarp->code)) {
 169         case SLARP_REQUEST:
 170                 printf("slarp-request");
 171                 break;
 172         case SLARP_REPLY:
 173                 printf("slarp-reply %s/%s",
 174                         ipaddr_string(&slarp->un.addr.addr),
 175                         ipaddr_string(&slarp->un.addr.mask));
 176                 break;
 177         case SLARP_KEEPALIVE:
 178                 printf("slarp-keepalive my=0x%x your=0x%x ",
 179                         (u_int32_t)ntohl(slarp->un.keep.myseq),
 180                         (u_int32_t)ntohl(slarp->un.keep.yourseq));
 181                 printf("reliability=0x%04x t1=%d.%d",
 182                         ntohs(slarp->un.keep.rel), ntohs(slarp->un.keep.t1),
 183                         ntohs(slarp->un.keep.t2));
 184                 break;
 185         default:
 186                 printf("slarp-0x%x unknown", (u_int32_t)ntohl(slarp->code));
 187                 break;
 188         }
 189
 190         if (SLARP_LEN < length && vflag)
 191                 printf("(trailing junk: %d bytes)", length - SLARP_LEN);
 192 }