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 1.4 2000-07-01 03:39:01 assar 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
  60 /* XXX This goes somewhere else. */
  61 #define CHDLC_HDRLEN 4
  62 #define CHDLC_UNICAST   0x0f
  63 #define CHDLC_BCAST     0x8f
  64 #define CHDLC_TYPE_SLARP        0x8035
  65 #define CHDLC_TYPE_CDP          0x2000
  66
  67 static void chdlc_slarp_print(const u_char *, u_int);
  68
  69 /* Standard CHDLC printer */
  70 void
  71 chdlc_if_print(u_char *user, const struct pcap_pkthdr *h,
  72              register const u_char *p)
  73 {
  74         register u_int length = h->len;
  75         register u_int caplen = h->caplen;
  76         const struct ip *ip;
  77         u_int proto;
  78
  79         ts_print(&h->ts);
  80
  81         if (caplen < CHDLC_HDRLEN) {
  82                 printf("[|chdlc]");
  83                 goto out;
  84         }
  85
  86         /*
  87          * Some printers want to get back at the link level addresses,
  88          * and/or check that they're not walking off the end of the packet.
  89          * Rather than pass them all the way down, we set these globals.
  90          */
  91         proto = ntohs(*(u_short *)&p[2]);
  92         packetp = p;
  93         snapend = p + caplen;
  94
  95         if (eflag) {
  96                 switch (p[0]) {
  97                 case CHDLC_UNICAST:
  98                         printf("unicast ");
  99                         break;
 100                 case CHDLC_BCAST:
 101                         printf("bcast ");
 102                         break;
 103                 default:
 104                         printf("0x%02x ", p[0]);
 105                         break;
 106                 }
 107                 printf("%d %04x: ", length, proto);
 108         }
 109
 110         length -= CHDLC_HDRLEN;
 111         ip = (struct ip *)(p + CHDLC_HDRLEN);
 112         switch (proto) {
 113         case ETHERTYPE_IP:
 114                 ip_print((const u_char *)ip, length);
 115                 break;
 116 #ifdef INET6
 117         case ETHERTYPE_IPV6:
 118                 ip6_print((const u_char *)ip, length);
 119                 break;
 120 #endif
 121         case CHDLC_TYPE_SLARP:
 122                 chdlc_slarp_print((const u_char *)ip, length);
 123                 break;
 124 #if 0
 125         case CHDLC_TYPE_CDP:
 126                 chdlc_cdp_print((const u_char *)ip, length);
 127                 break;
 128 #endif
 129         }
 130         if (xflag)
 131                 default_print((const u_char *)ip, caplen - CHDLC_HDRLEN);
 132 out:
 133         putchar('\n');
 134 }
 135
 136 struct cisco_slarp {
 137         long code;
 138 #define SLARP_REQUEST   0
 139 #define SLARP_REPLY     1
 140 #define SLARP_KEEPALIVE 2
 141         union {
 142                 struct {
 143                         struct in_addr addr;
 144                         struct in_addr mask;
 145                         u_short unused[3];
 146                 } addr;
 147                 struct {
 148                         long myseq;
 149                         long yourseq;
 150                         short rel;
 151                         short t1;
 152                         short t2;
 153                 } keep;
 154         } un;
 155 };
 156
 157 #define SLARP_LEN       18
 158
 159 static void
 160 chdlc_slarp_print(const u_char *cp, u_int length)
 161 {
 162         struct cisco_slarp *slarp;
 163
 164         if (length < SLARP_LEN) {
 165                 printf("[|slarp]");
 166                 return;
 167         }
 168
 169         slarp = (struct cisco_slarp *)cp;
 170         switch (ntohl(slarp->code)) {
 171         case SLARP_REQUEST:
 172                 printf("slarp-request");
 173                 break;
 174         case SLARP_REPLY:
 175                 printf("slarp-reply %s/%s",
 176                         ipaddr_string(&slarp->un.addr.addr),
 177                         ipaddr_string(&slarp->un.addr.mask));
 178                 break;
 179         case SLARP_KEEPALIVE:
 180                 printf("slarp-keepalive my=0x%x your=0x%x ",
 181                         (u_int32_t)ntohl(slarp->un.keep.myseq),
 182                         (u_int32_t)ntohl(slarp->un.keep.yourseq));
 183                 printf("reliability=0x%04x t1=%d.%d",
 184                         ntohs(slarp->un.keep.rel), ntohs(slarp->un.keep.t1),
 185                         ntohs(slarp->un.keep.t2));
 186                 break;
 187         default:
 188                 printf("slarp-0x%x unknown", (u_int32_t)ntohl(slarp->code));
 189                 break;
 190         }
 191
 192         if (SLARP_LEN < length && vflag)
 193                 printf("(trailing junk: %d bytes)", length - SLARP_LEN);
 194 }