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 1.15 2002-09-05 21:25:38 guy Exp $ (LBL)";
  26 #endif
  27
  28 #ifdef HAVE_CONFIG_H
  29 #include "config.h"
  30 #endif
  31
  32 #include <tcpdump-stdinc.h>
  33
  34 #include <pcap.h>
  35 #include <stdio.h>
  36
  37 #include "interface.h"
  38 #include "addrtoname.h"
  39 #include "ethertype.h"
  40 #include "extract.h"
  41 #include "ppp.h"
  42 #include "chdlc.h"
  43
  44 static void chdlc_slarp_print(const u_char *, u_int);
  45
  46 /* Standard CHDLC printer */
  47 void
  48 chdlc_if_print(u_char *user _U_, const struct pcap_pkthdr *h,
  49              register const u_char *p)
  50 {
  51         register u_int length = h->len;
  52         register u_int caplen = h->caplen;
  53
  54         ++infodelay;
  55         ts_print(&h->ts);
  56
  57         /*
  58          * Some printers want to get back at the link level addresses,
  59          * and/or check that they're not walking off the end of the packet.
  60          * Rather than pass them all the way down, we set these globals.
  61          */
  62         packetp = p;
  63         snapend = p + caplen;
  64
  65         chdlc_print(p, length, caplen);
  66
  67         putchar('\n');
  68         --infodelay;
  69         if (infoprint)
  70                 info(0);
  71 }
  72
  73 void
  74 chdlc_print(register const u_char *p, u_int length, u_int caplen)
  75 {
  76         const struct ip *ip;
  77         u_int proto;
  78
  79         if (caplen < CHDLC_HDRLEN) {
  80                 printf("[|chdlc]");
  81                 return;
  82         }
  83
  84         proto = EXTRACT_16BITS(&p[2]);
  85         if (eflag) {
  86                 switch (p[0]) {
  87                 case CHDLC_UNICAST:
  88                         printf("unicast ");
  89                         break;
  90                 case CHDLC_BCAST:
  91                         printf("bcast ");
  92                         break;
  93                 default:
  94                         printf("0x%02x ", p[0]);
  95                         break;
  96                 }
  97                 printf("%d %04x: ", length, proto);
  98         }
  99
 100         length -= CHDLC_HDRLEN;
 101         ip = (const struct ip *)(p + CHDLC_HDRLEN);
 102         switch (proto) {
 103         case ETHERTYPE_IP:
 104                 ip_print((const u_char *)ip, length);
 105                 break;
 106 #ifdef INET6
 107         case ETHERTYPE_IPV6:
 108                 ip6_print((const u_char *)ip, length);
 109                 break;
 110 #endif
 111         case CHDLC_TYPE_SLARP:
 112                 chdlc_slarp_print((const u_char *)ip, length);
 113                 break;
 114 #if 0
 115         case CHDLC_TYPE_CDP:
 116                 chdlc_cdp_print((const u_char *)ip, length);
 117                 break;
 118 #endif
 119         }
 120         if (xflag)
 121                 default_print((const u_char *)ip, caplen - CHDLC_HDRLEN);
 122 }
 123
 124 struct cisco_slarp {
 125         u_int32_t code;
 126 #define SLARP_REQUEST   0
 127 #define SLARP_REPLY     1
 128 #define SLARP_KEEPALIVE 2
 129         union {
 130                 struct {
 131                         struct in_addr addr;
 132                         struct in_addr mask;
 133                         u_int16_t unused[3];
 134                 } addr;
 135                 struct {
 136                         u_int32_t myseq;
 137                         u_int32_t yourseq;
 138                         u_int16_t rel;
 139                         u_int16_t t1;
 140                         u_int16_t t2;
 141                 } keep;
 142         } un;
 143 };
 144
 145 #define SLARP_LEN       18
 146
 147 static void
 148 chdlc_slarp_print(const u_char *cp, u_int length)
 149 {
 150         const struct cisco_slarp *slarp;
 151
 152         if (length < SLARP_LEN) {
 153                 printf("[|slarp]");
 154                 return;
 155         }
 156
 157         slarp = (const struct cisco_slarp *)cp;
 158         switch (ntohl(slarp->code)) {
 159         case SLARP_REQUEST:
 160                 printf("slarp-request");
 161                 break;
 162         case SLARP_REPLY:
 163                 printf("slarp-reply %s/%s",
 164                         ipaddr_string(&slarp->un.addr.addr),
 165                         ipaddr_string(&slarp->un.addr.mask));
 166                 break;
 167         case SLARP_KEEPALIVE:
 168                 printf("slarp-keepalive my=0x%x your=0x%x ",
 169                         (u_int32_t)ntohl(slarp->un.keep.myseq),
 170                         (u_int32_t)ntohl(slarp->un.keep.yourseq));
 171                 printf("reliability=0x%04x t1=%d.%d",
 172                         ntohs(slarp->un.keep.rel), ntohs(slarp->un.keep.t1),
 173                         ntohs(slarp->un.keep.t2));
 174                 break;
 175         default:
 176                 printf("slarp-0x%x unknown", (u_int32_t)ntohl(slarp->code));
 177                 break;
 178         }
 179
 180         if (SLARP_LEN < length && vflag)
 181                 printf("(trailing junk: %d bytes)", length - SLARP_LEN);
 182 }