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 1.11 2002-08-01 08:53:17 risso Exp $ (LBL)";
  25 #endif
  26
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #include <tcpdump-stdinc.h>
  32
  33 #include <stdio.h>
  34 #include <string.h>
  35
  36 #include "interface.h"
  37 #include "addrtoname.h"
  38 #include "extract.h"                    /* must come after interface.h */
  39 #include "ppp.h"
  40
  41 /* Codes */
  42 enum {
  43   LCP_CONFREQ = 1,
  44   LCP_CONFACK = 2,
  45   LCP_CONFNAK = 3,
  46   LCP_CONFREJ = 4,
  47   LCP_TERMREQ = 5,
  48   LCP_TERMACK = 6,
  49   LCP_CODEREJ = 7,
  50   LCP_PROTREJ = 8,
  51   LCP_ECHOREQ = 9,
  52   LCP_ECHOREP = 10,
  53   LCP_DISCARD = 11
  54 };
  55
  56 static struct tok lcpcode2str[] = {
  57   { LCP_CONFREQ, "ConfReq" },
  58   { LCP_CONFACK, "ConfAck" },
  59   { LCP_CONFNAK, "ConfNak" },
  60   { LCP_CONFREJ, "ConfRej" },
  61   { LCP_TERMREQ, "TermReq" },
  62   { LCP_TERMACK, "TermAck" },
  63   { LCP_CODEREJ, "CodeRej" },
  64   { LCP_PROTREJ, "ProtRej" },
  65   { LCP_ECHOREQ, "EchoReq" },
  66   { LCP_ECHOREP, "EchoRep" },
  67   { LCP_DISCARD, "Discard" },
  68   { 0, NULL }
  69 };
  70
  71
  72 enum {
  73   LCP_RESERVED  = 0,
  74   LCP_MRU       = 1,
  75   LCP_ASYNCMAP  = 2,
  76   LCP_AUTHPROTO = 3,
  77   LCP_QUALPROTO = 4,
  78   LCP_MAGICNUM  = 5,
  79   LCP_PCOMP     = 7,
  80   LCP_ACFCOMP   = 8,
  81   LCP_CALLBACK  = 13
  82 };
  83
  84 static struct tok lcpoption2str[] = {
  85   { LCP_RESERVED, "reserved"},
  86   { LCP_MRU, "mru"},
  87   { LCP_ASYNCMAP, "asyncmap"},
  88   { LCP_AUTHPROTO, "auth"},
  89   { LCP_QUALPROTO, "qual"},
  90   { LCP_MAGICNUM, "magic"},
  91   { LCP_PCOMP, "pcomp"},
  92   { LCP_ACFCOMP, "acfcomp"},
  93   { LCP_CALLBACK, "callback"},
  94   { 0, NULL }
  95 };
  96
  97 static struct tok lcpauth2str[] = {
  98   {0xc023, "PAP"},
  99   {0xc223, "CHAP"},
 100   { 0, NULL }
 101 };
 102
 103 static struct tok lcpqual2str[] = {
 104   {0xc025, "LQR"},
 105   { 0, NULL }
 106 };
 107
 108 static struct tok lcpchap2str[] = {
 109   {0x05, "MD5"},
 110   {0x80, "MS"},
 111   { 0, NULL }
 112 };
 113
 114 void
 115 lcp_print(register const u_char *bp, u_int length)
 116 {
 117   u_short lcp_code, lcp_id, lcp_length;
 118   const u_char *lcp_data;
 119
 120   lcp_data = bp+4;
 121
 122   if (snapend < lcp_data) {
 123     printf(" [LCP|]");
 124     return;
 125   }
 126
 127   lcp_code  = bp[0];
 128   lcp_id    = bp[1];
 129   lcp_length = EXTRACT_16BITS(bp+2);
 130
 131   printf("LCP %s id=0x%x", tok2str(lcpcode2str, "LCP-#%d", lcp_code), lcp_id);
 132
 133   switch (lcp_code) {
 134   case LCP_CONFREQ:
 135   case LCP_CONFACK:
 136   case LCP_CONFNAK:
 137   case LCP_CONFREJ:
 138     /* Print Options */
 139     {
 140       u_char lcpopt_type, lcpopt_length;
 141       const u_char *p=lcp_data;
 142       while (p+2 < lcp_data+lcp_length && p+2 < snapend) {
 143         lcpopt_type = p[0];
 144         lcpopt_length = p[1];
 145         p+=2;
 146         printf(" <%s ",tok2str(lcpoption2str, "option-#%d", lcpopt_type));
 147         if (lcpopt_length)
 148           switch (lcpopt_type) {
 149           case LCP_MRU:
 150             if (snapend < p+2) return;
 151             printf("%d",ntohs(*(u_short*)p));
 152             if (lcpopt_length != 4) printf(" len=%d!",lcpopt_length);
 153             break;
 154           case LCP_AUTHPROTO:
 155             if (snapend < p+2) return;
 156             printf("%s",tok2str(lcpauth2str, "AUTH-%#x", ntohs(*(u_short*)p)));
 157             if (lcpopt_length < 4) printf(" len=%d!",lcpopt_length);
 158             if (lcpopt_length >= 5 && p < snapend)
 159               printf(" %s",tok2str(lcpchap2str, "%#x", p[0]));
 160             break;
 161           case LCP_QUALPROTO:
 162             if (snapend < p+2) return;
 163             printf("%s",tok2str(lcpqual2str, "QUAL-%#x", ntohs(*(u_short*)p)));
 164             if (lcpopt_length < 4) printf(" len=%d!",lcpopt_length);
 165             /* Print data field of auth? */
 166             break;
 167           case LCP_ASYNCMAP:
 168           case LCP_MAGICNUM:
 169             if (snapend < p+4) return;
 170             printf("%#x", (unsigned)ntohl(*(u_long*)p));
 171             if (lcpopt_length != 6) printf(" len=%d!",lcpopt_length);
 172             break;
 173           case LCP_PCOMP:
 174           case LCP_ACFCOMP:
 175           case LCP_RESERVED:
 176             if (lcpopt_length != 2) printf(" len=%d!",lcpopt_length);
 177             break;
 178           default:
 179             if (lcpopt_length != 2) printf(" len=%d",lcpopt_length);
 180             break;
 181           }
 182         printf(">");
 183         p+=lcpopt_length-2;
 184       }
 185     }
 186     break;
 187   case LCP_ECHOREQ:
 188   case LCP_ECHOREP:
 189   case LCP_DISCARD:
 190     if (snapend < lcp_data+4) return;
 191     printf(" magic=%#x", (unsigned)ntohl(*(u_long *) lcp_data));
 192     lcp_data +=4;
 193     break;
 194   case LCP_PROTREJ:
 195     if (snapend < lcp_data+2) return;
 196     printf(" prot=%s", tok2str(ppptype2str, "PROT-%#x", ntohs(*(u_short *) lcp_data)));
 197     /* TODO print rejected packet too ? */
 198     break;
 199   case LCP_CODEREJ:
 200     if (snapend < lcp_data+4) return;
 201     printf(" ");
 202     lcp_print(lcp_data, (lcp_length+lcp_data > snapend ? snapend-lcp_data : lcp_length));
 203     break;
 204   case LCP_TERMREQ:
 205   case LCP_TERMACK:
 206     break;
 207   default:
 208     break;
 209   }
 210
 211   return;
 212 }