The Tcpdump Group git mirrors - tcpdump/blob - print-lcp.c

   1 /*
   2  * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that: (1) source code distributions
   7  * retain the above copyright notice and this paragraph in its entirety, (2)
   8  * distributions including binary code include the above copyright notice and
   9  * this paragraph in its entirety in the documentation or other materials
  10  * provided with the distribution, and (3) all advertising materials mentioning
  11  * features or use of this software display the following acknowledgement:
  12  * ``This product includes software developed by the University of California,
  13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  14  * the University nor the names of its contributors may be used to endorse
  15  * or promote products derived from this software without specific prior
  16  * written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  */
  21
  22 #ifndef lint
  23 static const char rcsid[] =
  24 "@(#) $Header: /tcpdump/master/tcpdump/Attic/print-lcp.c,v 1.9 2000-10-06 04:23:12 guy Exp $ (LBL)";
  25 #endif
  26
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #include <sys/param.h>
  32 #include <sys/time.h>
  33 #include <sys/socket.h>
  34
  35 #include <netinet/in.h>
  36
  37 #include <stdio.h>
  38 #include <string.h>
  39
  40 #include "interface.h"
  41 #include "addrtoname.h"
  42 #include "extract.h"                    /* must come after interface.h */
  43 #include "ppp.h"
  44
  45 /* Codes */
  46 enum {
  47   LCP_CONFREQ = 1,
  48   LCP_CONFACK = 2,
  49   LCP_CONFNAK = 3,
  50   LCP_CONFREJ = 4,
  51   LCP_TERMREQ = 5,
  52   LCP_TERMACK = 6,
  53   LCP_CODEREJ = 7,
  54   LCP_PROTREJ = 8,
  55   LCP_ECHOREQ = 9,
  56   LCP_ECHOREP = 10,
  57   LCP_DISCARD = 11
  58 };
  59
  60 static struct tok lcpcode2str[] = {
  61   { LCP_CONFREQ, "ConfReq" },
  62   { LCP_CONFACK, "ConfAck" },
  63   { LCP_CONFNAK, "ConfNak" },
  64   { LCP_CONFREJ, "ConfRej" },
  65   { LCP_TERMREQ, "TermReq" },
  66   { LCP_TERMACK, "TermAck" },
  67   { LCP_CODEREJ, "CodeRej" },
  68   { LCP_PROTREJ, "ProtRej" },
  69   { LCP_ECHOREQ, "EchoReq" },
  70   { LCP_ECHOREP, "EchoRep" },
  71   { LCP_DISCARD, "Discard" },
  72   { 0, NULL }
  73 };
  74
  75
  76 enum {
  77   LCP_RESERVED  = 0,
  78   LCP_MRU       = 1,
  79   LCP_ASYNCMAP  = 2,
  80   LCP_AUTHPROTO = 3,
  81   LCP_QUALPROTO = 4,
  82   LCP_MAGICNUM  = 5,
  83   LCP_PCOMP     = 7,
  84   LCP_ACFCOMP   = 8,
  85   LCP_CALLBACK  = 13
  86 };
  87
  88 static struct tok lcpoption2str[] = {
  89   { LCP_RESERVED, "reserved"},
  90   { LCP_MRU, "mru"},
  91   { LCP_ASYNCMAP, "asyncmap"},
  92   { LCP_AUTHPROTO, "auth"},
  93   { LCP_QUALPROTO, "qual"},
  94   { LCP_MAGICNUM, "magic"},
  95   { LCP_PCOMP, "pcomp"},
  96   { LCP_ACFCOMP, "acfcomp"},
  97   { LCP_CALLBACK, "callback"},
  98   { 0, NULL }
  99 };
 100
 101 static struct tok lcpauth2str[] = {
 102   {0xc023, "PAP"},
 103   {0xc223, "CHAP"},
 104   { 0, NULL }
 105 };
 106
 107 static struct tok lcpqual2str[] = {
 108   {0xc025, "LQR"},
 109   { 0, NULL }
 110 };
 111
 112 static struct tok lcpchap2str[] = {
 113   {0x05, "MD5"},
 114   {0x80, "MS"},
 115   { 0, NULL }
 116 };
 117
 118 void
 119 lcp_print(register const u_char *bp, u_int length)
 120 {
 121   u_short lcp_code, lcp_id, lcp_length;
 122   const u_char *lcp_data;
 123
 124   lcp_data = bp+4;
 125
 126   if (snapend < lcp_data) {
 127     printf(" [LCP|]");
 128     return;
 129   }
 130
 131   lcp_code  = bp[0];
 132   lcp_id    = bp[1];
 133   lcp_length = EXTRACT_16BITS(bp+2);
 134
 135   printf("LCP %s id=0x%x", tok2str(lcpcode2str, "LCP-#%d", lcp_code), lcp_id);
 136
 137   switch (lcp_code) {
 138   case LCP_CONFREQ:
 139   case LCP_CONFACK:
 140   case LCP_CONFNAK:
 141   case LCP_CONFREJ:
 142     /* Print Options */
 143     {
 144       u_char lcpopt_type, lcpopt_length;
 145       const u_char *p=lcp_data;
 146       while (p+2 < lcp_data+lcp_length && p+2 < snapend) {
 147         lcpopt_type = p[0];
 148         lcpopt_length = p[1];
 149         p+=2;
 150         printf(" <%s ",tok2str(lcpoption2str, "option-#%d", lcpopt_type));
 151         if (lcpopt_length)
 152           switch (lcpopt_type) {
 153           case LCP_MRU:
 154             if (snapend < p+2) return;
 155             printf("%d",ntohs(*(u_short*)p));
 156             if (lcpopt_length != 4) printf(" len=%d!",lcpopt_length);
 157             break;
 158           case LCP_AUTHPROTO:
 159             if (snapend < p+2) return;
 160             printf("%s",tok2str(lcpauth2str, "AUTH-%#x", ntohs(*(u_short*)p)));
 161             if (lcpopt_length < 4) printf(" len=%d!",lcpopt_length);
 162             if (lcpopt_length >= 5 && p < snapend)
 163               printf(" %s",tok2str(lcpchap2str, "%#x", p[0]));
 164             break;
 165           case LCP_QUALPROTO:
 166             if (snapend < p+2) return;
 167             printf("%s",tok2str(lcpqual2str, "QUAL-%#x", ntohs(*(u_short*)p)));
 168             if (lcpopt_length < 4) printf(" len=%d!",lcpopt_length);
 169             /* Print data field of auth? */
 170             break;
 171           case LCP_ASYNCMAP:
 172           case LCP_MAGICNUM:
 173             if (snapend < p+4) return;
 174             printf("%#x", (unsigned)ntohl(*(u_long*)p));
 175             if (lcpopt_length != 6) printf(" len=%d!",lcpopt_length);
 176             break;
 177           case LCP_PCOMP:
 178           case LCP_ACFCOMP:
 179           case LCP_RESERVED:
 180             if (lcpopt_length != 2) printf(" len=%d!",lcpopt_length);
 181             break;
 182           default:
 183             if (lcpopt_length != 2) printf(" len=%d",lcpopt_length);
 184             break;
 185           }
 186         printf(">");
 187         p+=lcpopt_length-2;
 188       }
 189     }
 190     break;
 191   case LCP_ECHOREQ:
 192   case LCP_ECHOREP:
 193   case LCP_DISCARD:
 194     if (snapend < lcp_data+4) return;
 195     printf(" magic=%#x", (unsigned)ntohl(*(u_long *) lcp_data));
 196     lcp_data +=4;
 197     break;
 198   case LCP_PROTREJ:
 199     if (snapend < lcp_data+2) return;
 200     printf(" prot=%s", tok2str(ppptype2str, "PROT-%#x", ntohs(*(u_short *) lcp_data)));
 201     /* TODO print rejected packet too ? */
 202     break;
 203   case LCP_CODEREJ:
 204     if (snapend < lcp_data+4) return;
 205     printf(" ");
 206     lcp_print(lcp_data, (lcp_length+lcp_data > snapend ? snapend-lcp_data : lcp_length));
 207     break;
 208   case LCP_TERMREQ:
 209   case LCP_TERMACK:
 210     break;
 211   default:
 212     break;
 213   }
 214
 215   return;
 216 }