contrib/tcpdump/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 1.2 1999/11/21 09:36:49 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/socket.h>
  35 #include <sys/file.h>
  36 #include <sys/ioctl.h>
  37
  38 #if __STDC__
  39 struct mbuf;
  40 struct rtentry;
  41 #endif
  42 #include <net/if.h>
  43
  44 #include <netinet/in.h>
  45 #include <netinet/in_systm.h>
  46 #include <netinet/ip.h>
  47 #include <netinet/if_ether.h>
  48
  49 #include <ctype.h>
  50 #include <netdb.h>
  51 #include <pcap.h>
  52 #include <stdio.h>
  53 #ifdef __bsdi__
  54 #include <net/slcompress.h>
  55 #include <net/if_ppp.h>
  56 #endif
  57
  58 #include "interface.h"
  59 #include "addrtoname.h"
  60 #include "ppp.h"
  61
  62 /* XXX This goes somewhere else. */
  63 #define CHDLC_HDRLEN 4
  64 #define CHDLC_UNICAST   0x0f
  65 #define CHDLC_BCAST     0x8f
  66 #define CHDLC_TYPE_SLARP        0x8035
  67 #define CHDLC_TYPE_CDP          0x2000
  68
  69 static void chdlc_slarp_print(const u_char *, u_int);
  70
  71 /* Standard CHDLC printer */
  72 void
  73 chdlc_if_print(u_char *user, const struct pcap_pkthdr *h,
  74              register const u_char *p)
  75 {
  76         register u_int length = h->len;
  77         register u_int caplen = h->caplen;
  78         const struct ip *ip;
  79         u_int proto;
  80
  81         ts_print(&h->ts);
  82
  83         if (caplen < CHDLC_HDRLEN) {
  84                 printf("[|chdlc]");
  85                 goto out;
  86         }
  87
  88         /*
  89          * Some printers want to get back at the link level addresses,
  90          * and/or check that they're not walking off the end of the packet.
  91          * Rather than pass them all the way down, we set these globals.
  92          */
  93         proto = ntohs(*(u_short *)&p[2]);
  94         packetp = p;
  95         snapend = p + caplen;
  96
  97         if (eflag) {
  98                 switch (p[0]) {
  99                 case CHDLC_UNICAST:
 100                         printf("unicast ");
 101                         break;
 102                 case CHDLC_BCAST:
 103                         printf("bcast ");
 104                         break;
 105                 default:
 106                         printf("0x%02x ", p[0]);
 107                         break;
 108                 }
 109                 printf("%d %04x: ", length, proto);
 110         }
 111
 112         length -= CHDLC_HDRLEN;
 113         ip = (struct ip *)(p + CHDLC_HDRLEN);
 114         switch(proto) {
 115         case ETHERTYPE_IP:
 116                 ip_print((const u_char *)ip, length);
 117                 break;
 118 #ifdef INET6
 119         case ETHERTYPE_IPV6:
 120                 ip6_print((const u_char *)ip, length);
 121                 break;
 122 #endif
 123         case CHDLC_TYPE_SLARP:
 124                 chdlc_slarp_print((const u_char *)ip, length);
 125                 break;
 126 #if 0
 127         case CHDLC_TYPE_CDP:
 128                 chdlc_cdp_print((const u_char *)ip, length);
 129                 break;
 130 #endif
 131         }
 132         if (xflag)
 133                 default_print((const u_char *)ip, caplen - CHDLC_HDRLEN);
 134 out:
 135         putchar('\n');
 136 }
 137
 138 struct cisco_slarp {
 139         long code;
 140 #define SLARP_REQUEST   0
 141 #define SLARP_REPLY     1
 142 #define SLARP_KEEPALIVE 2
 143         union {
 144                 struct {
 145                         struct in_addr addr;
 146                         struct in_addr mask;
 147                         u_short unused[3];
 148                 } addr;
 149                 struct {
 150                         long myseq;
 151                         long yourseq;
 152                         short rel;
 153                         short t1;
 154                         short t2;
 155                 } keep;
 156         } un;
 157 };
 158
 159 #define SLARP_LEN       18
 160
 161 static void
 162 chdlc_slarp_print(const u_char *cp, u_int length)
 163 {
 164         struct cisco_slarp *slarp;
 165
 166         if (length < SLARP_LEN) {
 167                 printf("[|slarp]");
 168                 return;
 169         }
 170
 171         slarp = (struct cisco_slarp *)cp;
 172         switch (ntohl(slarp->code)) {
 173         case SLARP_REQUEST:
 174                 printf("slarp-request");
 175                 break;
 176         case SLARP_REPLY:
 177                 printf("slarp-reply %s/%s",
 178                         ipaddr_string(&slarp->un.addr.addr),
 179                         ipaddr_string(&slarp->un.addr.mask));
 180                 break;
 181         case SLARP_KEEPALIVE:
 182                 printf("slarp-keepalive my=0x%x your=0x%x ",
 183                         (u_int32_t)ntohl(slarp->un.keep.myseq),
 184                         (u_int32_t)ntohl(slarp->un.keep.yourseq));
 185                 printf("reliability=0x%04x t1=%d.%d",
 186                         ntohs(slarp->un.keep.rel), ntohs(slarp->un.keep.t1),
 187                         ntohs(slarp->un.keep.t2));
 188                 break;
 189         default:
 190                 printf("slarp-0x%x unknown", (u_int32_t)ntohl(slarp->code));
 191                 break;
 192         }
 193
 194         if (SLARP_LEN < length && vflag)
 195                 printf("(trailing junk: %d bytes)", length - SLARP_LEN);
 196 }