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 1.12 2001-07-05 18:54:14 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
  35 #include <netinet/in.h>
  36
  37 #include <ctype.h>
  38 #include <netdb.h>
  39 #include <pcap.h>
  40 #include <stdio.h>
  41
  42 #include "interface.h"
  43 #include "addrtoname.h"
  44 #include "ethertype.h"
  45 #include "ppp.h"
  46 #include "chdlc.h"
  47
  48 static void chdlc_slarp_print(const u_char *, u_int);
  49
  50 /* Standard CHDLC printer */
  51 void
  52 chdlc_if_print(u_char *user, const struct pcap_pkthdr *h,
  53              register const u_char *p)
  54 {
  55         register u_int length = h->len;
  56         register u_int caplen = h->caplen;
  57
  58         ++infodelay;
  59         ts_print(&h->ts);
  60
  61         /*
  62          * Some printers want to get back at the link level addresses,
  63          * and/or check that they're not walking off the end of the packet.
  64          * Rather than pass them all the way down, we set these globals.
  65          */
  66         packetp = p;
  67         snapend = p + caplen;
  68
  69         chdlc_print(p, length, caplen);
  70
  71         putchar('\n');
  72         --infodelay;
  73         if (infoprint)
  74                 info(0);
  75 }
  76
  77 void
  78 chdlc_print(register const u_char *p, u_int length, u_int caplen)
  79 {
  80         const struct ip *ip;
  81         u_int proto;
  82
  83         if (caplen < CHDLC_HDRLEN) {
  84                 printf("[|chdlc]");
  85                 return;
  86         }
  87
  88         proto = ntohs(*(u_short *)&p[2]);
  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 }
 127
 128 struct cisco_slarp {
 129         u_int32_t 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_int16_t unused[3];
 138                 } addr;
 139                 struct {
 140                         u_int32_t myseq;
 141                         u_int32_t yourseq;
 142                         u_int16_t rel;
 143                         u_int16_t t1;
 144                         u_int16_t 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 }