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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#)main.c   8.3 (Berkeley) 5/30/95
  30  * $FreeBSD: src/crypto/telnet/telnet/main.c,v 1.4.2.5 2002/04/13 10:59:08 markm Exp $
  31  */
  32
  33 #include <sys/types.h>
  34 #include <sys/socket.h>
  35 #include <stdlib.h>
  36 #include <string.h>
  37 #include <unistd.h>
  38
  39 #include "ring.h"
  40 #include "externs.h"
  41 #include "defines.h"
  42
  43 #ifdef  AUTHENTICATION
  44 #include <libtelnet/auth.h>
  45 #endif
  46 #ifdef  ENCRYPTION
  47 #include <libtelnet/encrypt.h>
  48 #endif
  49
  50 /* These values need to be the same as defined in libtelnet/kerberos5.c */
  51 /* Either define them in both places, or put in some common header file. */
  52 #define OPTS_FORWARD_CREDS      0x00000002
  53 #define OPTS_FORWARDABLE_CREDS  0x00000001
  54
  55 #if 0
  56 #define FORWARD
  57 #endif
  58
  59 #if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
  60 char *ipsec_policy_in = NULL;
  61 char *ipsec_policy_out = NULL;
  62 #endif
  63
  64 int family = AF_UNSPEC;
  65
  66 /*
  67  * Initialize variables.
  68  */
  69 void
  70 tninit(void)
  71 {
  72     init_terminal();
  73
  74     init_network();
  75
  76     init_telnet();
  77
  78     init_sys();
  79 }
  80
  81 static void
  82 usage(void)
  83 {
  84         fprintf(stderr, "Usage: %s %s%s%s%s\n",
  85             prompt,
  86 #ifdef  AUTHENTICATION
  87             "[-4] [-6] [-8] [-E] [-K] [-L] [-N] [-S tos] [-X atype] [-c] [-d]",
  88             "\n\t[-e char] [-k realm] [-l user] [-f/-F] [-n tracefile] ",
  89 #else
  90             "[-4] [-6] [-8] [-E] [-L] [-N] [-S tos] [-c] [-d]",
  91             "\n\t[-e char] [-l user] [-n tracefile] ",
  92 #endif
  93             "[-r] [-s src_addr] [-u] ",
  94 #if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
  95             "[-P policy] "
  96 #endif
  97 #ifdef  ENCRYPTION
  98             "[-y] [host-name [port]]"
  99 #else   /* ENCRYPTION */
 100             "[host-name [port]]"
 101 #endif  /* ENCRYPTION */
 102         );
 103         exit(1);
 104 }
 105
 106 /*
 107  * main.  Parse arguments, invoke the protocol or command parser.
 108  */
 109
 110 int
 111 main(int argc, char *argv[])
 112 {
 113         int ch;
 114         char *user;
 115         char *src_addr = NULL;
 116 #ifdef  FORWARD
 117         extern int forward_flags;
 118 #endif  /* FORWARD */
 119
 120         tninit();               /* Clear out things */
 121
 122         TerminalSaveState();
 123
 124         if ((prompt = strrchr(argv[0], '/')))
 125                 ++prompt;
 126         else
 127                 prompt = argv[0];
 128
 129         user = NULL;
 130
 131         rlogin = (strncmp(prompt, "rlog", 4) == 0) ? '~' : _POSIX_VDISABLE;
 132 #ifdef AUTHENTICATION
 133         autologin = 0;
 134 #else
 135         autologin = -1;
 136 #endif
 137
 138 #ifdef  ENCRYPTION
 139         encrypt_auto(1);
 140         decrypt_auto(1);
 141 #endif
 142
 143 #if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
 144 #define IPSECOPT        "P:"
 145 #else
 146 #define IPSECOPT
 147 #endif
 148         while ((ch = getopt(argc, argv,
 149                             "468EKLNS:X:acde:fFk:l:n:rs:t:uxy" IPSECOPT)) != -1)
 150 #undef IPSECOPT
 151         {
 152                 switch(ch) {
 153                 case '4':
 154                         family = AF_INET;
 155                         break;
 156 #ifdef INET6
 157                 case '6':
 158                         family = AF_INET6;
 159                         break;
 160 #endif
 161                 case '8':
 162                         eight = 3;      /* binary output and input */
 163                         break;
 164                 case 'E':
 165                         rlogin = escape = _POSIX_VDISABLE;
 166                         break;
 167                 case 'K':
 168 #ifdef  AUTHENTICATION
 169                         /* It's the default now, so ignore */
 170 #endif
 171                         break;
 172                 case 'L':
 173                         eight |= 2;     /* binary output only */
 174                         break;
 175                 case 'N':
 176                         doaddrlookup = 0;
 177                         break;
 178                 case 'S':
 179                     {
 180 #ifdef  HAS_GETTOS
 181                         extern int tos;
 182
 183                         if ((tos = parsetos(optarg, "tcp")) < 0)
 184                                 fprintf(stderr, "%s%s%s%s\n",
 185                                         prompt, ": Bad TOS argument '",
 186                                         optarg,
 187                                         "; will try to use default TOS");
 188 #else
 189                         fprintf(stderr,
 190                            "%s: Warning: -S ignored, no parsetos() support.\n",
 191                                                                 prompt);
 192 #endif
 193                     }
 194                         break;
 195                 case 'X':
 196 #ifdef  AUTHENTICATION
 197                         auth_disable_name(optarg);
 198 #endif
 199                         break;
 200                 case 'a':
 201                         autologin = 1;
 202                         break;
 203                 case 'c':
 204                         skiprc = 1;
 205                         break;
 206                 case 'd':
 207                         debug = 1;
 208                         break;
 209                 case 'e':
 210                         set_escape_char(optarg);
 211                         break;
 212                 case 'f':
 213 #ifdef  AUTHENTICATION
 214 #if defined(KRB5) && defined(FORWARD)
 215                         if (forward_flags & OPTS_FORWARD_CREDS) {
 216                             fprintf(stderr,
 217                                     "%s: Only one of -f and -F allowed.\n",
 218                                     prompt);
 219                             usage();
 220                         }
 221                         forward_flags |= OPTS_FORWARD_CREDS;
 222 #else
 223                         fprintf(stderr,
 224                          "%s: Warning: -f ignored, no Kerberos V5 support.\n",
 225                                 prompt);
 226 #endif
 227 #else
 228                         fprintf(stderr,
 229                          "%s: Warning: -f ignored, no Kerberos V5 support.\n",
 230                                 prompt);
 231 #endif
 232                         break;
 233                 case 'F':
 234 #ifdef  AUTHENTICATION
 235 #if defined(KRB5) && defined(FORWARD)
 236                         if (forward_flags & OPTS_FORWARD_CREDS) {
 237                             fprintf(stderr,
 238                                     "%s: Only one of -f and -F allowed.\n",
 239                                     prompt);
 240                             usage();
 241                         }
 242                         forward_flags |= OPTS_FORWARD_CREDS;
 243                         forward_flags |= OPTS_FORWARDABLE_CREDS;
 244 #else
 245                         fprintf(stderr,
 246                          "%s: Warning: -F ignored, no Kerberos V5 support.\n",
 247                                 prompt);
 248 #endif
 249 #else
 250                         fprintf(stderr,
 251                          "%s: Warning: -F ignored, no Kerberos V5 support.\n",
 252                                 prompt);
 253 #endif
 254                         break;
 255                 case 'k':
 256 #ifdef  AUTHENTICATION
 257 #if defined(KRB4)
 258                     {
 259                         extern char *dest_realm, dst_realm_buf[], dst_realm_sz;
 260                         dest_realm = dst_realm_buf;
 261                         (void)strncpy(dest_realm, optarg, dst_realm_sz);
 262                     }
 263 #else
 264                         fprintf(stderr,
 265                            "%s: Warning: -k ignored, no Kerberos V4 support.\n",
 266                                                                 prompt);
 267 #endif
 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 #ifdef  AUTHENTICATION
 276                         /* This is the default now, so ignore it */
 277 #else
 278                         autologin = 1;
 279 #endif
 280                         user = optarg;
 281                         break;
 282                 case 'n':
 283                                 SetNetTrace(optarg);
 284                         break;
 285                 case 'r':
 286                         rlogin = '~';
 287                         break;
 288                 case 's':
 289                         src_addr = optarg;
 290                         break;
 291                 case 'u':
 292                         family = AF_UNIX;
 293                         break;
 294                 case 'x':
 295 #ifndef ENCRYPTION
 296                         fprintf(stderr,
 297                             "%s: Warning: -x ignored, no ENCRYPT support.\n",
 298                                                                 prompt);
 299 #endif  /* ENCRYPTION */
 300                         break;
 301                 case 'y':
 302 #ifdef  ENCRYPTION
 303                         encrypt_auto(0);
 304                         decrypt_auto(0);
 305 #else
 306                         fprintf(stderr,
 307                             "%s: Warning: -y ignored, no ENCRYPT support.\n",
 308                                                                 prompt);
 309 #endif  /* ENCRYPTION */
 310                         break;
 311 #if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
 312                 case 'P':
 313                         if (!strncmp("in", optarg, 2))
 314                                 ipsec_policy_in = strdup(optarg);
 315                         else if (!strncmp("out", optarg, 3))
 316                                 ipsec_policy_out = strdup(optarg);
 317                         else
 318                                 usage();
 319                         break;
 320 #endif
 321                 case '?':
 322                 default:
 323                         usage();
 324                         /* NOTREACHED */
 325                 }
 326         }
 327         if (autologin == -1)
 328                 autologin = (rlogin == _POSIX_VDISABLE) ? 0 : 1;
 329
 330         argc -= optind;
 331         argv += optind;
 332
 333         if (argc) {
 334                 char *args[9], **argp = args;
 335
 336                 if (argc > 2)
 337                         usage();
 338                 *argp++ = prompt;
 339                 if (user) {
 340                         *argp++ = strdup("-l");
 341                         *argp++ = user;
 342                 }
 343                 if (src_addr) {
 344                         *argp++ = strdup("-s");
 345                         *argp++ = src_addr;
 346                 }
 347                 *argp++ = argv[0];              /* host */
 348                 if (argc > 1)
 349                         *argp++ = argv[1];      /* port */
 350                 *argp = NULL;
 351
 352                 if (setjmp(toplevel) != 0)
 353                         Exit(0);
 354                 if (tn(argp - args, args) == 1)
 355                         return (0);
 356                 else
 357                         return (1);
 358         }
 359         (void)setjmp(toplevel);
 360         for (;;) {
 361                         command(1, 0, 0);
 362         }
 363         return 0;
 364 }