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 1.5 2000-09-18 05:11:44 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 #include <net/if.h>
  41
  42 #include <netinet/in.h>
  43 #include <netinet/in_systm.h>
  44 #include <netinet/ip.h>
  45 #include <netinet/if_ether.h>
  46
  47 #include <ctype.h>
  48 #include <netdb.h>
  49 #include <pcap.h>
  50 #include <stdio.h>
  51 #ifdef __bsdi__
  52 #include <net/slcompress.h>
  53 #include <net/if_ppp.h>
  54 #endif
  55
  56 #include "interface.h"
  57 #include "addrtoname.h"
  58 #include "ppp.h"
  59 #include "chdlc.h"
  60
  61 static void chdlc_slarp_print(const u_char *, u_int);
  62
  63 /* Standard CHDLC printer */
  64 void
  65 chdlc_if_print(u_char *user, const struct pcap_pkthdr *h,
  66              register const u_char *p)
  67 {
  68         register u_int length = h->len;
  69         register u_int caplen = h->caplen;
  70         const struct ip *ip;
  71         u_int proto;
  72
  73         ts_print(&h->ts);
  74
  75         if (caplen < CHDLC_HDRLEN) {
  76                 printf("[|chdlc]");
  77                 goto out;
  78         }
  79
  80         /*
  81          * Some printers want to get back at the link level addresses,
  82          * and/or check that they're not walking off the end of the packet.
  83          * Rather than pass them all the way down, we set these globals.
  84          */
  85         proto = ntohs(*(u_short *)&p[2]);
  86         packetp = p;
  87         snapend = p + caplen;
  88
  89         if (eflag) {
  90                 switch (p[0]) {
  91                 case CHDLC_UNICAST:
  92                         printf("unicast ");
  93                         break;
  94                 case CHDLC_BCAST:
  95                         printf("bcast ");
  96                         break;
  97                 default:
  98                         printf("0x%02x ", p[0]);
  99                         break;
 100                 }
 101                 printf("%d %04x: ", length, proto);
 102         }
 103
 104         length -= CHDLC_HDRLEN;
 105         ip = (struct ip *)(p + CHDLC_HDRLEN);
 106         switch (proto) {
 107         case ETHERTYPE_IP:
 108                 ip_print((const u_char *)ip, length);
 109                 break;
 110 #ifdef INET6
 111         case ETHERTYPE_IPV6:
 112                 ip6_print((const u_char *)ip, length);
 113                 break;
 114 #endif
 115         case CHDLC_TYPE_SLARP:
 116                 chdlc_slarp_print((const u_char *)ip, length);
 117                 break;
 118 #if 0
 119         case CHDLC_TYPE_CDP:
 120                 chdlc_cdp_print((const u_char *)ip, length);
 121                 break;
 122 #endif
 123         }
 124         if (xflag)
 125                 default_print((const u_char *)ip, caplen - CHDLC_HDRLEN);
 126 out:
 127         putchar('\n');
 128 }
 129
 130 struct cisco_slarp {
 131         long code;
 132 #define SLARP_REQUEST   0
 133 #define SLARP_REPLY     1
 134 #define SLARP_KEEPALIVE 2
 135         union {
 136                 struct {
 137                         struct in_addr addr;
 138                         struct in_addr mask;
 139                         u_short unused[3];
 140                 } addr;
 141                 struct {
 142                         long myseq;
 143                         long yourseq;
 144                         short rel;
 145                         short t1;
 146                         short t2;
 147                 } keep;
 148         } un;
 149 };
 150
 151 #define SLARP_LEN       18
 152
 153 static void
 154 chdlc_slarp_print(const u_char *cp, u_int length)
 155 {
 156         struct cisco_slarp *slarp;
 157
 158         if (length < SLARP_LEN) {
 159                 printf("[|slarp]");
 160                 return;
 161         }
 162
 163         slarp = (struct cisco_slarp *)cp;
 164         switch (ntohl(slarp->code)) {
 165         case SLARP_REQUEST:
 166                 printf("slarp-request");
 167                 break;
 168         case SLARP_REPLY:
 169                 printf("slarp-reply %s/%s",
 170                         ipaddr_string(&slarp->un.addr.addr),
 171                         ipaddr_string(&slarp->un.addr.mask));
 172                 break;
 173         case SLARP_KEEPALIVE:
 174                 printf("slarp-keepalive my=0x%x your=0x%x ",
 175                         (u_int32_t)ntohl(slarp->un.keep.myseq),
 176                         (u_int32_t)ntohl(slarp->un.keep.yourseq));
 177                 printf("reliability=0x%04x t1=%d.%d",
 178                         ntohs(slarp->un.keep.rel), ntohs(slarp->un.keep.t1),
 179                         ntohs(slarp->un.keep.t2));
 180                 break;
 181         default:
 182                 printf("slarp-0x%x unknown", (u_int32_t)ntohl(slarp->code));
 183                 break;
 184         }
 185
 186         if (SLARP_LEN < length && vflag)
 187                 printf("(trailing junk: %d bytes)", length - SLARP_LEN);
 188 }