usr.bin/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  * @(#)main.c   8.3 (Berkeley) 5/30/95
  34  * $FreeBSD: src/crypto/telnet/telnet/main.c,v 1.4.2.5 2002/04/13 10:59:08 markm Exp $
  35  * $DragonFly: src/crypto/telnet/telnet/main.c,v 1.2 2003/06/17 04:24:37 dillon Exp $
  36  */
  37
  38 #include <sys/types.h>
  39 #include <sys/socket.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42 #include <unistd.h>
  43
  44 #include "ring.h"
  45 #include "externs.h"
  46 #include "defines.h"
  47
  48 #ifdef  AUTHENTICATION
  49 #include <libtelnet/auth.h>
  50 #endif
  51 #ifdef  ENCRYPTION
  52 #include <libtelnet/encrypt.h>
  53 #endif
  54
  55 /* These values need to be the same as defined in libtelnet/kerberos5.c */
  56 /* Either define them in both places, or put in some common header file. */
  57 #define OPTS_FORWARD_CREDS      0x00000002
  58 #define OPTS_FORWARDABLE_CREDS  0x00000001
  59
  60 #if 0
  61 #define FORWARD
  62 #endif
  63
  64 #if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
  65 char *ipsec_policy_in = NULL;
  66 char *ipsec_policy_out = NULL;
  67 #endif
  68
  69 int family = AF_UNSPEC;
  70
  71 /*
  72  * Initialize variables.
  73  */
  74 void
  75 tninit(void)
  76 {
  77     init_terminal();
  78
  79     init_network();
  80
  81     init_telnet();
  82
  83     init_sys();
  84 }
  85
  86 static void
  87 usage(void)
  88 {
  89         fprintf(stderr, "Usage: %s %s%s%s%s\n",
  90             prompt,
  91 #ifdef  AUTHENTICATION
  92             "[-4] [-6] [-8] [-E] [-K] [-L] [-N] [-S tos] [-X atype] [-c] [-d]",
  93             "\n\t[-e char] [-k realm] [-l user] [-f/-F] [-n tracefile] ",
  94 #else
  95             "[-4] [-6] [-8] [-E] [-L] [-N] [-S tos] [-c] [-d]",
  96             "\n\t[-e char] [-l user] [-n tracefile] ",
  97 #endif
  98             "[-r] [-s src_addr] [-u] ",
  99 #if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
 100             "[-P policy] "
 101 #endif
 102 #ifdef  ENCRYPTION
 103             "[-y] [host-name [port]]"
 104 #else   /* ENCRYPTION */
 105             "[host-name [port]]"
 106 #endif  /* ENCRYPTION */
 107         );
 108         exit(1);
 109 }
 110
 111 /*
 112  * main.  Parse arguments, invoke the protocol or command parser.
 113  */
 114
 115 int
 116 main(int argc, char *argv[])
 117 {
 118         int ch;
 119         char *user;
 120         char *src_addr = NULL;
 121 #ifdef  FORWARD
 122         extern int forward_flags;
 123 #endif  /* FORWARD */
 124
 125         tninit();               /* Clear out things */
 126
 127         TerminalSaveState();
 128
 129         if ((prompt = strrchr(argv[0], '/')))
 130                 ++prompt;
 131         else
 132                 prompt = argv[0];
 133
 134         user = NULL;
 135
 136         rlogin = (strncmp(prompt, "rlog", 4) == 0) ? '~' : _POSIX_VDISABLE;
 137 #ifdef AUTHENTICATION
 138         autologin = 0;
 139 #else
 140         autologin = -1;
 141 #endif
 142
 143 #ifdef  ENCRYPTION
 144         encrypt_auto(1);
 145         decrypt_auto(1);
 146 #endif
 147
 148 #if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
 149 #define IPSECOPT        "P:"
 150 #else
 151 #define IPSECOPT
 152 #endif
 153         while ((ch = getopt(argc, argv,
 154                             "468EKLNS:X:acde:fFk:l:n:rs:t:uxy" IPSECOPT)) != -1)
 155 #undef IPSECOPT
 156         {
 157                 switch(ch) {
 158                 case '4':
 159                         family = AF_INET;
 160                         break;
 161 #ifdef INET6
 162                 case '6':
 163                         family = AF_INET6;
 164                         break;
 165 #endif
 166                 case '8':
 167                         eight = 3;      /* binary output and input */
 168                         break;
 169                 case 'E':
 170                         rlogin = escape = _POSIX_VDISABLE;
 171                         break;
 172                 case 'K':
 173 #ifdef  AUTHENTICATION
 174                         /* It's the default now, so ignore */
 175 #endif
 176                         break;
 177                 case 'L':
 178                         eight |= 2;     /* binary output only */
 179                         break;
 180                 case 'N':
 181                         doaddrlookup = 0;
 182                         break;
 183                 case 'S':
 184                     {
 185 #ifdef  HAS_GETTOS
 186                         extern int tos;
 187
 188                         if ((tos = parsetos(optarg, "tcp")) < 0)
 189                                 fprintf(stderr, "%s%s%s%s\n",
 190                                         prompt, ": Bad TOS argument '",
 191                                         optarg,
 192                                         "; will try to use default TOS");
 193 #else
 194                         fprintf(stderr,
 195                            "%s: Warning: -S ignored, no parsetos() support.\n",
 196                                                                 prompt);
 197 #endif
 198                     }
 199                         break;
 200                 case 'X':
 201 #ifdef  AUTHENTICATION
 202                         auth_disable_name(optarg);
 203 #endif
 204                         break;
 205                 case 'a':
 206                         autologin = 1;
 207                         break;
 208                 case 'c':
 209                         skiprc = 1;
 210                         break;
 211                 case 'd':
 212                         debug = 1;
 213                         break;
 214                 case 'e':
 215                         set_escape_char(optarg);
 216                         break;
 217                 case 'f':
 218 #ifdef  AUTHENTICATION
 219 #if defined(KRB5) && defined(FORWARD)
 220                         if (forward_flags & OPTS_FORWARD_CREDS) {
 221                             fprintf(stderr,
 222                                     "%s: Only one of -f and -F allowed.\n",
 223                                     prompt);
 224                             usage();
 225                         }
 226                         forward_flags |= OPTS_FORWARD_CREDS;
 227 #else
 228                         fprintf(stderr,
 229                          "%s: Warning: -f ignored, no Kerberos V5 support.\n",
 230                                 prompt);
 231 #endif
 232 #else
 233                         fprintf(stderr,
 234                          "%s: Warning: -f ignored, no Kerberos V5 support.\n",
 235                                 prompt);
 236 #endif
 237                         break;
 238                 case 'F':
 239 #ifdef  AUTHENTICATION
 240 #if defined(KRB5) && defined(FORWARD)
 241                         if (forward_flags & OPTS_FORWARD_CREDS) {
 242                             fprintf(stderr,
 243                                     "%s: Only one of -f and -F allowed.\n",
 244                                     prompt);
 245                             usage();
 246                         }
 247                         forward_flags |= OPTS_FORWARD_CREDS;
 248                         forward_flags |= OPTS_FORWARDABLE_CREDS;
 249 #else
 250                         fprintf(stderr,
 251                          "%s: Warning: -F ignored, no Kerberos V5 support.\n",
 252                                 prompt);
 253 #endif
 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 #ifdef  AUTHENTICATION
 262 #if defined(KRB4)
 263                     {
 264                         extern char *dest_realm, dst_realm_buf[], dst_realm_sz;
 265                         dest_realm = dst_realm_buf;
 266                         (void)strncpy(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 #else
 274                         fprintf(stderr,
 275                            "%s: Warning: -k ignored, no Kerberos V4 support.\n",
 276                                                                 prompt);
 277 #endif
 278                         break;
 279                 case 'l':
 280 #ifdef  AUTHENTICATION
 281                         /* This is the default now, so ignore it */
 282 #else
 283                         autologin = 1;
 284 #endif
 285                         user = optarg;
 286                         break;
 287                 case 'n':
 288                                 SetNetTrace(optarg);
 289                         break;
 290                 case 'r':
 291                         rlogin = '~';
 292                         break;
 293                 case 's':
 294                         src_addr = optarg;
 295                         break;
 296                 case 'u':
 297                         family = AF_UNIX;
 298                         break;
 299                 case 'x':
 300 #ifndef ENCRYPTION
 301                         fprintf(stderr,
 302                             "%s: Warning: -x ignored, no ENCRYPT support.\n",
 303                                                                 prompt);
 304 #endif  /* ENCRYPTION */
 305                         break;
 306                 case 'y':
 307 #ifdef  ENCRYPTION
 308                         encrypt_auto(0);
 309                         decrypt_auto(0);
 310 #else
 311                         fprintf(stderr,
 312                             "%s: Warning: -y ignored, no ENCRYPT support.\n",
 313                                                                 prompt);
 314 #endif  /* ENCRYPTION */
 315                         break;
 316 #if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
 317                 case 'P':
 318                         if (!strncmp("in", optarg, 2))
 319                                 ipsec_policy_in = strdup(optarg);
 320                         else if (!strncmp("out", optarg, 3))
 321                                 ipsec_policy_out = strdup(optarg);
 322                         else
 323                                 usage();
 324                         break;
 325 #endif
 326                 case '?':
 327                 default:
 328                         usage();
 329                         /* NOTREACHED */
 330                 }
 331         }
 332         if (autologin == -1)
 333                 autologin = (rlogin == _POSIX_VDISABLE) ? 0 : 1;
 334
 335         argc -= optind;
 336         argv += optind;
 337
 338         if (argc) {
 339                 char *args[9], **argp = args;
 340
 341                 if (argc > 2)
 342                         usage();
 343                 *argp++ = prompt;
 344                 if (user) {
 345                         *argp++ = strdup("-l");
 346                         *argp++ = user;
 347                 }
 348                 if (src_addr) {
 349                         *argp++ = strdup("-s");
 350                         *argp++ = src_addr;
 351                 }
 352                 *argp++ = argv[0];              /* host */
 353                 if (argc > 1)
 354                         *argp++ = argv[1];      /* port */
 355                 *argp = 0;
 356
 357                 if (setjmp(toplevel) != 0)
 358                         Exit(0);
 359                 if (tn(argp - args, args) == 1)
 360                         return (0);
 361                 else
 362                         return (1);
 363         }
 364         (void)setjmp(toplevel);
 365         for (;;) {
 366                         command(1, 0, 0);
 367         }
 368         return 0;
 369 }