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("$Id$");
  42
  43 #if KRB5
  44 #define FORWARD
  45 #endif
  46
  47 /*
  48  * Initialize variables.
  49  */
  50 void
  51 tninit(void)
  52 {
  53     init_terminal();
  54
  55     init_network();
  56
  57     init_telnet();
  58
  59     init_sys();
  60 }
  61
  62 void
  63 usage(void)
  64 {
  65   fprintf(stderr, "Usage: %s %s%s%s%s\n", prompt,
  66 #ifdef  AUTHENTICATION
  67           "[-8] [-E] [-K] [-L] [-G] [-S tos] [-X atype] [-a] [-c] [-d] [-e char]",
  68           "\n\t[-k realm] [-l user] [-f/-F] [-n tracefile] ",
  69 #else
  70           "[-8] [-E] [-L] [-S tos] [-a] [-c] [-d] [-e char] [-l user]",
  71           "\n\t[-n tracefile]",
  72 #endif
  73           "[-r] ",
  74 #ifdef  ENCRYPTION
  75           "[-x] [host-name [port]]"
  76 #else
  77           "[host-name [port]]"
  78 #endif
  79     );
  80   exit(1);
  81 }
  82
  83 /*
  84  * main.  Parse arguments, invoke the protocol or command parser.
  85  */
  86
  87
  88 #ifdef  FORWARD
  89 int forward_option = 0; /* forward flags set from command line */
  90 #endif  /* FORWARD */
  91 void
  92 set_forward_options(void)
  93 {
  94 #ifdef FORWARD
  95         switch(forward_option) {
  96         case 'f':
  97                 kerberos5_set_forward(1);
  98                 kerberos5_set_forwardable(0);
  99                 break;
 100         case 'F':
 101                 kerberos5_set_forward(1);
 102                 kerberos5_set_forwardable(1);
 103                 break;
 104         case 'G':
 105                 kerberos5_set_forward(0);
 106                 kerberos5_set_forwardable(0);
 107                 break;
 108         default:
 109                 break;
 110         }
 111 #endif
 112 }
 113
 114 #ifdef KRB5
 115 #define Authenticator asn1_Authenticator
 116 #include <krb5.h>
 117 static void
 118 krb5_init(void)
 119 {
 120     krb5_context context;
 121     krb5_error_code ret;
 122     krb5_boolean ret_val;
 123
 124     ret = krb5_init_context(&context);
 125     if (ret)
 126         return;
 127
 128 #if defined(AUTHENTICATION) && defined(FORWARD)
 129     krb5_appdefault_boolean(context, NULL,
 130                             NULL, "forward",
 131                             0, &ret_val);
 132     if (ret_val)
 133             kerberos5_set_forward(1);
 134     krb5_appdefault_boolean(context, NULL,
 135                             NULL, "forwardable",
 136                             0, &ret_val);
 137     if (ret_val)
 138             kerberos5_set_forwardable(1);
 139 #endif
 140 #ifdef  ENCRYPTION
 141     krb5_appdefault_boolean(context, NULL,
 142                             NULL, "encrypt",
 143                             0, &ret_val);
 144     if (ret_val) {
 145           encrypt_auto(1);
 146           decrypt_auto(1);
 147           wantencryption = 1;
 148           EncryptVerbose(1);
 149         }
 150 #endif
 151
 152     krb5_free_context(context);
 153 }
 154 #endif
 155
 156 #if defined(AUTHENTICATION) && defined(KRB4)
 157 extern char *dest_realm, dst_realm_buf[];
 158 extern int dst_realm_sz;
 159 #endif
 160
 161 int
 162 main(int argc, char **argv)
 163 {
 164         int ch;
 165         char *user;
 166
 167         setprogname(argv[0]);
 168
 169 #ifdef KRB5
 170         krb5_init();
 171 #endif
 172
 173         tninit();               /* Clear out things */
 174
 175         TerminalSaveState();
 176
 177         if ((prompt = strrchr(argv[0], '/')))
 178                 ++prompt;
 179         else
 180                 prompt = argv[0];
 181
 182         user = NULL;
 183
 184         rlogin = (strncmp(prompt, "rlog", 4) == 0) ? '~' : _POSIX_VDISABLE;
 185
 186         /*
 187          * if AUTHENTICATION and ENCRYPTION is set autologin will be
 188          * se to true after the getopt switch; unless the -K option is
 189          * passed
 190          */
 191         autologin = -1;
 192
 193         if (argc == 2 && strcmp(argv[1], "--version") == 0) {
 194             print_version(NULL);
 195             exit(0);
 196         }
 197
 198         while((ch = getopt(argc, argv,
 199                            "78DEKLS:X:abcde:fFk:l:n:rxG")) != -1) {
 200                 switch(ch) {
 201                 case '8':
 202                         eight = 3;      /* binary output and input */
 203                         break;
 204                 case '7':
 205                         eight = 0;
 206                         break;
 207                 case 'b':
 208                     binary = 3;
 209                     break;
 210                 case 'D': {
 211                     /* sometimes we don't want a mangled display */
 212                     char *p;
 213                     if((p = getenv("DISPLAY")))
 214                         env_define((unsigned char*)"DISPLAY", (unsigned char*)p);
 215                     break;
 216                 }
 217                 case 'E':
 218                         rlogin = escape = _POSIX_VDISABLE;
 219                         break;
 220                 case 'K':
 221 #ifdef  AUTHENTICATION
 222                         autologin = 0;
 223 #endif
 224                         break;
 225                 case 'L':
 226                         eight |= 2;     /* binary output only */
 227                         break;
 228                 case 'S':
 229                     {
 230 #ifdef  HAVE_PARSETOS
 231                         extern int tos;
 232
 233                         if ((tos = parsetos(optarg, "tcp")) < 0)
 234                                 fprintf(stderr, "%s%s%s%s\n",
 235                                         prompt, ": Bad TOS argument '",
 236                                         optarg,
 237                                         "; will try to use default TOS");
 238 #else
 239                         fprintf(stderr,
 240                            "%s: Warning: -S ignored, no parsetos() support.\n",
 241                                                                 prompt);
 242 #endif
 243                     }
 244                         break;
 245                 case 'X':
 246 #ifdef  AUTHENTICATION
 247                         auth_disable_name(optarg);
 248 #endif
 249                         break;
 250                 case 'a':
 251                         autologin = 1;
 252                         break;
 253                 case 'c':
 254                         skiprc = 1;
 255                         break;
 256                 case 'd':
 257                         debug = 1;
 258                         break;
 259                 case 'e':
 260                         set_escape_char(optarg);
 261                         break;
 262                 case 'f':
 263                 case 'F':
 264                 case 'G':
 265 #if defined(AUTHENTICATION) && defined(KRB5) && defined(FORWARD)
 266                         if (forward_option) {
 267                             fprintf(stderr,
 268                                     "%s: Only one of -f, -F and -G allowed.\n",
 269                                     prompt);
 270                             usage();
 271                         }
 272                         forward_option = ch;
 273 #else
 274                         fprintf(stderr,
 275                          "%s: Warning: -%c ignored, no Kerberos V5 support.\n",
 276                                 prompt, ch);
 277 #endif
 278                         break;
 279                 case 'k':
 280 #if defined(AUTHENTICATION) && defined(KRB4)
 281                     {
 282                         dest_realm = dst_realm_buf;
 283                         strlcpy(dest_realm, optarg, dst_realm_sz);
 284                     }
 285 #else
 286                         fprintf(stderr,
 287                            "%s: Warning: -k ignored, no Kerberos V4 support.\n",
 288                                                                 prompt);
 289 #endif
 290                         break;
 291                 case 'l':
 292                   if(autologin == 0){
 293                     fprintf(stderr, "%s: Warning: -K ignored\n", prompt);
 294                     autologin = -1;
 295                   }
 296                         user = optarg;
 297                         break;
 298                 case 'n':
 299                                 SetNetTrace(optarg);
 300                         break;
 301                 case 'r':
 302                         rlogin = '~';
 303                         break;
 304                 case 'x':
 305 #ifdef  ENCRYPTION
 306                         encrypt_auto(1);
 307                         decrypt_auto(1);
 308                         wantencryption = 1;
 309                         EncryptVerbose(1);
 310 #else
 311                         fprintf(stderr,
 312                             "%s: Warning: -x ignored, no ENCRYPT support.\n",
 313                                                                 prompt);
 314 #endif
 315                         break;
 316
 317                 case '?':
 318                 default:
 319                         usage();
 320                         /* NOTREACHED */
 321                 }
 322         }
 323
 324         if (autologin == -1) {          /* esc@magic.fi; force  */
 325 #if defined(AUTHENTICATION)
 326                 autologin = 1;
 327 #endif
 328 #if defined(ENCRYPTION)
 329                 encrypt_auto(1);
 330                 decrypt_auto(1);
 331                 wantencryption = -1;
 332 #endif
 333         }
 334
 335         if (autologin == -1)
 336                 autologin = (rlogin == _POSIX_VDISABLE) ? 0 : 1;
 337
 338         argc -= optind;
 339         argv += optind;
 340
 341         if (argc) {
 342                 char *args[7], **argp = args;
 343
 344                 if (argc > 2)
 345                         usage();
 346                 *argp++ = prompt;
 347                 if (user) {
 348                         *argp++ = "-l";
 349                         *argp++ = user;
 350                 }
 351                 *argp++ = argv[0];              /* host */
 352                 if (argc > 1)
 353                         *argp++ = argv[1];      /* port */
 354                 *argp = 0;
 355
 356                 if (setjmp(toplevel) != 0)
 357                         Exit(0);
 358                 if (tn(argp - args, args) == 1)
 359                         return (0);
 360                 else
 361                         return (1);
 362         }
 363         setjmp(toplevel);
 364         for (;;) {
 365                         command(1, 0, 0);
 366         }
 367 }