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