contrib/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 #include <sys/cdefs.h>
  35
  36 __FBSDID("$FreeBSD$");
  37
  38 #ifndef lint
  39 static const char sccsid[] = "@(#)main.c        8.3 (Berkeley) 5/30/95";
  40 #endif
  41
  42 #include <sys/types.h>
  43 #include <sys/socket.h>
  44 #include <stdlib.h>
  45 #include <string.h>
  46 #include <unistd.h>
  47
  48 #include "ring.h"
  49 #include "externs.h"
  50 #include "defines.h"
  51
  52 #ifdef  AUTHENTICATION
  53 #include <libtelnet/auth.h>
  54 #endif
  55 #ifdef  ENCRYPTION
  56 #include <libtelnet/encrypt.h>
  57 #endif
  58
  59 /* These values need to be the same as defined in libtelnet/kerberos5.c */
  60 /* Either define them in both places, or put in some common header file. */
  61 #define OPTS_FORWARD_CREDS      0x00000002
  62 #define OPTS_FORWARDABLE_CREDS  0x00000001
  63
  64 #if 0
  65 #define FORWARD
  66 #endif
  67
  68 #if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
  69 char *ipsec_policy_in = NULL;
  70 char *ipsec_policy_out = NULL;
  71 #endif
  72
  73 int family = AF_UNSPEC;
  74
  75 /*
  76  * Initialize variables.
  77  */
  78 void
  79 tninit(void)
  80 {
  81     init_terminal();
  82
  83     init_network();
  84
  85     init_telnet();
  86
  87     init_sys();
  88 }
  89
  90 static void
  91 usage(void)
  92 {
  93         fprintf(stderr, "Usage: %s %s%s%s%s\n",
  94             prompt,
  95 #ifdef  AUTHENTICATION
  96             "[-4] [-6] [-8] [-E] [-K] [-L] [-N] [-S tos] [-X atype] [-c] [-d]",
  97             "\n\t[-e char] [-k realm] [-l user] [-f/-F] [-n tracefile] ",
  98 #else
  99             "[-4] [-6] [-8] [-E] [-L] [-N] [-S tos] [-c] [-d]",
 100             "\n\t[-e char] [-l user] [-n tracefile] ",
 101 #endif
 102             "[-r] [-s src_addr] [-u] ",
 103 #if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
 104             "[-P policy] "
 105 #endif
 106 #ifdef  ENCRYPTION
 107             "[-y] [host-name [port]]"
 108 #else   /* ENCRYPTION */
 109             "[host-name [port]]"
 110 #endif  /* ENCRYPTION */
 111         );
 112         exit(1);
 113 }
 114
 115 /*
 116  * main.  Parse arguments, invoke the protocol or command parser.
 117  */
 118
 119 int
 120 main(int argc, char *argv[])
 121 {
 122         int ch;
 123         char *user;
 124         char *src_addr = NULL;
 125 #ifdef  FORWARD
 126         extern int forward_flags;
 127 #endif  /* FORWARD */
 128
 129         tninit();               /* Clear out things */
 130
 131         TerminalSaveState();
 132
 133         if ((prompt = strrchr(argv[0], '/')))
 134                 ++prompt;
 135         else
 136                 prompt = argv[0];
 137
 138         user = NULL;
 139
 140         rlogin = (strncmp(prompt, "rlog", 4) == 0) ? '~' : _POSIX_VDISABLE;
 141 #ifdef AUTHENTICATION
 142         autologin = 1;
 143 #else
 144         autologin = -1;
 145 #endif
 146
 147 #ifdef  ENCRYPTION
 148         encrypt_auto(1);
 149         decrypt_auto(1);
 150 #endif
 151
 152 #if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
 153 #define IPSECOPT        "P:"
 154 #else
 155 #define IPSECOPT
 156 #endif
 157         while ((ch = getopt(argc, argv,
 158                             "468EKLNS:X:acde:fFk:l:n:rs:t:uxy" IPSECOPT)) != -1)
 159 #undef IPSECOPT
 160         {
 161                 switch(ch) {
 162                 case '4':
 163                         family = AF_INET;
 164                         break;
 165 #ifdef INET6
 166                 case '6':
 167                         family = AF_INET6;
 168                         break;
 169 #endif
 170                 case '8':
 171                         eight = 3;      /* binary output and input */
 172                         break;
 173                 case 'E':
 174                         rlogin = escape = _POSIX_VDISABLE;
 175                         break;
 176                 case 'K':
 177 #ifdef  AUTHENTICATION
 178                         autologin = 0;
 179 #endif
 180                         break;
 181                 case 'L':
 182                         eight |= 2;     /* binary output only */
 183                         break;
 184                 case 'N':
 185                         doaddrlookup = 0;
 186                         break;
 187                 case 'S':
 188                     {
 189 #ifdef  HAS_GETTOS
 190                         extern int tos;
 191
 192                         if ((tos = parsetos(optarg, "tcp")) < 0)
 193                                 fprintf(stderr, "%s%s%s%s\n",
 194                                         prompt, ": Bad TOS argument '",
 195                                         optarg,
 196                                         "; will try to use default TOS");
 197 #else
 198                         fprintf(stderr,
 199                            "%s: Warning: -S ignored, no parsetos() support.\n",
 200                                                                 prompt);
 201 #endif
 202                     }
 203                         break;
 204                 case 'X':
 205 #ifdef  AUTHENTICATION
 206                         auth_disable_name(optarg);
 207 #endif
 208                         break;
 209                 case 'a':
 210 #ifdef  AUTHENTICATION
 211                         /* It's the default now, so ignore */
 212 #else
 213                         autologin = 1;
 214 #endif
 215                         break;
 216                 case 'c':
 217                         skiprc = 1;
 218                         break;
 219                 case 'd':
 220                         debug = 1;
 221                         break;
 222                 case 'e':
 223                         set_escape_char(optarg);
 224                         break;
 225                 case 'f':
 226 #ifdef  AUTHENTICATION
 227 #if defined(KRB5) && defined(FORWARD)
 228                         if (forward_flags & OPTS_FORWARD_CREDS) {
 229                             fprintf(stderr,
 230                                     "%s: Only one of -f and -F allowed.\n",
 231                                     prompt);
 232                             usage();
 233                         }
 234                         forward_flags |= OPTS_FORWARD_CREDS;
 235 #else
 236                         fprintf(stderr,
 237                          "%s: Warning: -f ignored, no Kerberos V5 support.\n",
 238                                 prompt);
 239 #endif
 240 #else
 241                         fprintf(stderr,
 242                          "%s: Warning: -f ignored, no Kerberos V5 support.\n",
 243                                 prompt);
 244 #endif
 245                         break;
 246                 case 'F':
 247 #ifdef  AUTHENTICATION
 248 #if defined(KRB5) && defined(FORWARD)
 249                         if (forward_flags & OPTS_FORWARD_CREDS) {
 250                             fprintf(stderr,
 251                                     "%s: Only one of -f and -F allowed.\n",
 252                                     prompt);
 253                             usage();
 254                         }
 255                         forward_flags |= OPTS_FORWARD_CREDS;
 256                         forward_flags |= OPTS_FORWARDABLE_CREDS;
 257 #else
 258                         fprintf(stderr,
 259                          "%s: Warning: -F ignored, no Kerberos V5 support.\n",
 260                                 prompt);
 261 #endif
 262 #else
 263                         fprintf(stderr,
 264                          "%s: Warning: -F ignored, no Kerberos V5 support.\n",
 265                                 prompt);
 266 #endif
 267                         break;
 268                 case 'k':
 269 #ifdef  AUTHENTICATION
 270 #if defined(KRB4)
 271                     {
 272                         extern char *dest_realm, dst_realm_buf[], dst_realm_sz;
 273                         dest_realm = dst_realm_buf;
 274                         (void)strncpy(dest_realm, optarg, dst_realm_sz);
 275                     }
 276 #else
 277                         fprintf(stderr,
 278                            "%s: Warning: -k ignored, no Kerberos V4 support.\n",
 279                                                                 prompt);
 280 #endif
 281 #else
 282                         fprintf(stderr,
 283                            "%s: Warning: -k ignored, no Kerberos V4 support.\n",
 284                                                                 prompt);
 285 #endif
 286                         break;
 287                 case 'l':
 288 #ifdef  AUTHENTICATION
 289                         /* This is the default now, so ignore it */
 290 #else
 291                         autologin = 1;
 292 #endif
 293                         user = optarg;
 294                         break;
 295                 case 'n':
 296                                 SetNetTrace(optarg);
 297                         break;
 298                 case 'r':
 299                         rlogin = '~';
 300                         break;
 301                 case 's':
 302                         src_addr = optarg;
 303                         break;
 304                 case 'u':
 305                         family = AF_UNIX;
 306                         break;
 307                 case 'x':
 308 #ifndef ENCRYPTION
 309                         fprintf(stderr,
 310                             "%s: Warning: -x ignored, no ENCRYPT support.\n",
 311                                                                 prompt);
 312 #endif  /* ENCRYPTION */
 313                         break;
 314                 case 'y':
 315 #ifdef  ENCRYPTION
 316                         encrypt_auto(0);
 317                         decrypt_auto(0);
 318 #else
 319                         fprintf(stderr,
 320                             "%s: Warning: -y ignored, no ENCRYPT support.\n",
 321                                                                 prompt);
 322 #endif  /* ENCRYPTION */
 323                         break;
 324 #if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
 325                 case 'P':
 326                         if (!strncmp("in", optarg, 2))
 327                                 ipsec_policy_in = strdup(optarg);
 328                         else if (!strncmp("out", optarg, 3))
 329                                 ipsec_policy_out = strdup(optarg);
 330                         else
 331                                 usage();
 332                         break;
 333 #endif
 334                 case '?':
 335                 default:
 336                         usage();
 337                         /* NOTREACHED */
 338                 }
 339         }
 340         if (autologin == -1)
 341                 autologin = (rlogin == _POSIX_VDISABLE) ? 0 : 1;
 342
 343         argc -= optind;
 344         argv += optind;
 345
 346         if (argc) {
 347                 char *args[9], **argp = args;
 348
 349                 if (argc > 2)
 350                         usage();
 351                 *argp++ = prompt;
 352                 if (user) {
 353                         *argp++ = strdup("-l");
 354                         *argp++ = user;
 355                 }
 356                 if (src_addr) {
 357                         *argp++ = strdup("-s");
 358                         *argp++ = src_addr;
 359                 }
 360                 *argp++ = argv[0];              /* host */
 361                 if (argc > 1)
 362                         *argp++ = argv[1];      /* port */
 363                 *argp = 0;
 364
 365                 if (setjmp(toplevel) != 0)
 366                         Exit(0);
 367                 if (tn(argp - args, args) == 1)
 368                         return (0);
 369                 else
 370                         return (1);
 371         }
 372         (void)setjmp(toplevel);
 373         for (;;) {
 374                         command(1, 0, 0);
 375         }
 376         return 0;
 377 }