crypto/kerberosIV/appl/telnet/telnet/main.c

   1 /*
   2  * Copyright (c) 1988, 1990, 1993
   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 the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 static char *copyright[] = {
  35     "@(#) Copyright (c) 1988, 1990, 1993\n"
  36     "\tThe Regents of the University of California.  All rights reserved.\n",
  37     (char*)copyright
  38 };
  39
  40 #include "telnet_locl.h"
  41 RCSID("$Id: main.c,v 1.30 1999/11/13 06:30:11 assar Exp $");
  42
  43 /* These values need to be the same as defined in libtelnet/kerberos5.c */
  44 /* Either define them in both places, or put in some common header file. */
  45 #define OPTS_FORWARD_CREDS      0x00000002
  46 #define OPTS_FORWARDABLE_CREDS  0x00000001
  47
  48 #if KRB5
  49 #define FORWARD
  50 #endif
  51
  52 /*
  53  * Initialize variables.
  54  */
  55 void
  56 tninit(void)
  57 {
  58     init_terminal();
  59
  60     init_network();
  61
  62     init_telnet();
  63
  64     init_sys();
  65 }
  66
  67 void
  68 usage(void)
  69 {
  70   fprintf(stderr, "Usage: %s %s%s%s%s\n", prompt,
  71 #ifdef  AUTHENTICATION
  72           "[-8] [-E] [-K] [-L] [-G] [-S tos] [-X atype] [-a] [-c] [-d] [-e char]",
  73           "\n\t[-k realm] [-l user] [-f/-F] [-n tracefile] ",
  74 #else
  75           "[-8] [-E] [-L] [-S tos] [-a] [-c] [-d] [-e char] [-l user]",
  76           "\n\t[-n tracefile]",
  77 #endif
  78           "[-r] ",
  79 #ifdef  ENCRYPTION
  80           "[-x] [host-name [port]]"
  81 #else
  82           "[host-name [port]]"
  83 #endif
  84     );
  85   exit(1);
  86 }
  87
  88 /*
  89  * main.  Parse arguments, invoke the protocol or command parser.
  90  */
  91
  92
  93 #ifdef  FORWARD
  94 extern int forward_flags;
  95 static int default_forward=0;
  96 #endif  /* FORWARD */
  97
  98 #ifdef KRB5
  99 /* XXX ugly hack to setup dns-proxy stuff */
 100 #define Authenticator asn1_Authenticator
 101 #include <krb5.h>
 102 static void
 103 krb5_init(void)
 104 {
 105     krb5_context context;
 106     krb5_init_context(&context);
 107
 108 #if defined(AUTHENTICATION) && defined(KRB5) && defined(FORWARD)
 109     if (krb5_config_get_bool (context, NULL,
 110          "libdefaults", "forward", NULL)) {
 111            forward_flags |= OPTS_FORWARD_CREDS;
 112            default_forward=1;
 113     }
 114     if (krb5_config_get_bool (context, NULL,
 115          "libdefaults", "forwardable", NULL)) {
 116            forward_flags |= OPTS_FORWARDABLE_CREDS;
 117            default_forward=1;
 118     }
 119 #endif
 120 #ifdef  ENCRYPTION
 121     if (krb5_config_get_bool (context, NULL,
 122         "libdefaults", "encrypt", NULL)) {
 123           encrypt_auto(1);
 124           decrypt_auto(1);
 125           EncryptVerbose(1);
 126         }
 127 #endif
 128
 129     krb5_free_context(context);
 130 }
 131 #endif
 132
 133 int
 134 main(int argc, char **argv)
 135 {
 136         int ch;
 137         char *user;
 138
 139 #ifdef KRB5
 140         krb5_init();
 141 #endif
 142
 143         tninit();               /* Clear out things */
 144
 145         TerminalSaveState();
 146
 147         if ((prompt = strrchr(argv[0], '/')))
 148                 ++prompt;
 149         else
 150                 prompt = argv[0];
 151
 152         user = NULL;
 153
 154         rlogin = (strncmp(prompt, "rlog", 4) == 0) ? '~' : _POSIX_VDISABLE;
 155
 156         /*
 157          * if AUTHENTICATION and ENCRYPTION is set autologin will be
 158          * se to true after the getopt switch; unless the -K option is
 159          * passed
 160          */
 161         autologin = -1;
 162
 163         while((ch = getopt(argc, argv,
 164                            "78DEKLS:X:abcde:fFk:l:n:rxG")) != -1) {
 165                 switch(ch) {
 166                 case '8':
 167                         eight = 3;      /* binary output and input */
 168                         break;
 169                 case '7':
 170                         eight = 0;
 171                         break;
 172                 case 'b':
 173                     binary = 3;
 174                     break;
 175                 case 'D': {
 176                     /* sometimes we don't want a mangled display */
 177                     char *p;
 178                     if((p = getenv("DISPLAY")))
 179                         env_define("DISPLAY", (unsigned char*)p);
 180                     break;
 181                 }
 182                 case 'E':
 183                         rlogin = escape = _POSIX_VDISABLE;
 184                         break;
 185                 case 'K':
 186 #ifdef  AUTHENTICATION
 187                         autologin = 0;
 188 #endif
 189                         break;
 190                 case 'L':
 191                         eight |= 2;     /* binary output only */
 192                         break;
 193                 case 'S':
 194                     {
 195 #ifdef  HAVE_PARSETOS
 196                         extern int tos;
 197
 198                         if ((tos = parsetos(optarg, "tcp")) < 0)
 199                                 fprintf(stderr, "%s%s%s%s\n",
 200                                         prompt, ": Bad TOS argument '",
 201                                         optarg,
 202                                         "; will try to use default TOS");
 203 #else
 204                         fprintf(stderr,
 205                            "%s: Warning: -S ignored, no parsetos() support.\n",
 206                                                                 prompt);
 207 #endif
 208                     }
 209                         break;
 210                 case 'X':
 211 #ifdef  AUTHENTICATION
 212                         auth_disable_name(optarg);
 213 #endif
 214                         break;
 215                 case 'a':
 216                         autologin = 1;
 217                         break;
 218                 case 'c':
 219                         skiprc = 1;
 220                         break;
 221                 case 'd':
 222                         debug = 1;
 223                         break;
 224                 case 'e':
 225                         set_escape_char(optarg);
 226                         break;
 227                 case 'f':
 228 #if defined(AUTHENTICATION) && defined(KRB5) && defined(FORWARD)
 229                         if ((forward_flags & OPTS_FORWARD_CREDS) &&
 230                             !default_forward) {
 231                             fprintf(stderr,
 232                                     "%s: Only one of -f and -F allowed.\n",
 233                                     prompt);
 234                             usage();
 235                         }
 236                         forward_flags |= OPTS_FORWARD_CREDS;
 237 #else
 238                         fprintf(stderr,
 239                          "%s: Warning: -f ignored, no Kerberos V5 support.\n",
 240                                 prompt);
 241 #endif
 242                         break;
 243                 case 'F':
 244 #if defined(AUTHENTICATION) && defined(KRB5) && defined(FORWARD)
 245                         if ((forward_flags & OPTS_FORWARD_CREDS) &&
 246                             !default_forward) {
 247                             fprintf(stderr,
 248                                     "%s: Only one of -f and -F allowed.\n",
 249                                     prompt);
 250                             usage();
 251                         }
 252                         forward_flags |= OPTS_FORWARD_CREDS;
 253                         forward_flags |= OPTS_FORWARDABLE_CREDS;
 254 #else
 255                         fprintf(stderr,
 256                          "%s: Warning: -F ignored, no Kerberos V5 support.\n",
 257                                 prompt);
 258 #endif
 259                         break;
 260                 case 'k':
 261 #if defined(AUTHENTICATION) && defined(KRB4)
 262                     {
 263                         extern char *dest_realm, dst_realm_buf[];
 264                         extern int dst_realm_sz;
 265                         dest_realm = dst_realm_buf;
 266                         strlcpy(dest_realm, optarg, dst_realm_sz);
 267                     }
 268 #else
 269                         fprintf(stderr,
 270                            "%s: Warning: -k ignored, no Kerberos V4 support.\n",
 271                                                                 prompt);
 272 #endif
 273                         break;
 274                 case 'l':
 275                   if(autologin == 0){
 276                     fprintf(stderr, "%s: Warning: -K ignored\n", prompt);
 277                     autologin = -1;
 278                   }
 279                         user = optarg;
 280                         break;
 281                 case 'n':
 282                                 SetNetTrace(optarg);
 283                         break;
 284                 case 'r':
 285                         rlogin = '~';
 286                         break;
 287                 case 'x':
 288 #ifdef  ENCRYPTION
 289                         encrypt_auto(1);
 290                         decrypt_auto(1);
 291                         EncryptVerbose(1);
 292 #else
 293                         fprintf(stderr,
 294                             "%s: Warning: -x ignored, no ENCRYPT support.\n",
 295                                                                 prompt);
 296 #endif
 297                         break;
 298                 case 'G':
 299 #if defined(AUTHENTICATION) && defined(KRB5) && defined(FORWARD)
 300                         forward_flags ^= OPTS_FORWARD_CREDS;
 301                         forward_flags ^= OPTS_FORWARDABLE_CREDS;
 302 #else
 303                         fprintf(stderr,
 304                          "%s: Warning: -G ignored, no Kerberos V5 support.\n",
 305                                 prompt);
 306 #endif
 307                         break;
 308
 309                 case '?':
 310                 default:
 311                         usage();
 312                         /* NOTREACHED */
 313                 }
 314         }
 315
 316         if (autologin == -1) {          /* esc@magic.fi; force  */
 317 #if defined(AUTHENTICATION)
 318                 autologin = 1;
 319 #endif
 320 #if defined(ENCRYPTION)
 321                 encrypt_auto(1);
 322                 decrypt_auto(1);
 323 #endif
 324         }
 325
 326         if (autologin == -1)
 327                 autologin = (rlogin == _POSIX_VDISABLE) ? 0 : 1;
 328
 329         argc -= optind;
 330         argv += optind;
 331
 332         if (argc) {
 333                 char *args[7], **argp = args;
 334
 335                 if (argc > 2)
 336                         usage();
 337                 *argp++ = prompt;
 338                 if (user) {
 339                         *argp++ = "-l";
 340                         *argp++ = user;
 341                 }
 342                 *argp++ = argv[0];              /* host */
 343                 if (argc > 1)
 344                         *argp++ = argv[1];      /* port */
 345                 *argp = 0;
 346
 347                 if (setjmp(toplevel) != 0)
 348                         Exit(0);
 349                 if (tn(argp - args, args) == 1)
 350                         return (0);
 351                 else
 352                         return (1);
 353         }
 354         setjmp(toplevel);
 355         for (;;) {
 356                         command(1, 0, 0);
 357         }
 358 }