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/usr.bin/telnet/main.c,v 1.10.2.5 2002/04/13 11:07:13 markm Exp $
  35  * $DragonFly: src/usr.bin/telnet/main.c,v 1.2 2003/06/17 04:29:32 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
  49 /* These values need to be the same as defined in libtelnet/kerberos5.c */
  50 /* Either define them in both places, or put in some common header file. */
  51 #define OPTS_FORWARD_CREDS      0x00000002
  52 #define OPTS_FORWARDABLE_CREDS  0x00000001
  53
  54 #if 0
  55 #define FORWARD
  56 #endif
  57
  58 #if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
  59 char *ipsec_policy_in = NULL;
  60 char *ipsec_policy_out = NULL;
  61 #endif
  62
  63 int family = AF_UNSPEC;
  64
  65 /*
  66  * Initialize variables.
  67  */
  68 void
  69 tninit(void)
  70 {
  71     init_terminal();
  72
  73     init_network();
  74
  75     init_telnet();
  76
  77     init_sys();
  78 }
  79
  80 static void
  81 usage(void)
  82 {
  83         fprintf(stderr, "Usage: %s %s%s%s%s\n",
  84             prompt,
  85             "[-4] [-6] [-8] [-E] [-L] [-N] [-S tos] [-c] [-d]",
  86             "\n\t[-e char] [-l user] [-n tracefile] ",
  87             "[-r] [-s src_addr] [-u] ",
  88 #if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
  89             "[-P policy] "
  90 #endif
  91             "[host-name [port]]"
  92         );
  93         exit(1);
  94 }
  95
  96 /*
  97  * main.  Parse arguments, invoke the protocol or command parser.
  98  */
  99
 100 int
 101 main(int argc, char *argv[])
 102 {
 103         int ch;
 104         char *user;
 105         char *src_addr = NULL;
 106 #ifdef  FORWARD
 107         extern int forward_flags;
 108 #endif  /* FORWARD */
 109
 110         tninit();               /* Clear out things */
 111
 112         TerminalSaveState();
 113
 114         if ((prompt = strrchr(argv[0], '/')))
 115                 ++prompt;
 116         else
 117                 prompt = argv[0];
 118
 119         user = NULL;
 120
 121         rlogin = (strncmp(prompt, "rlog", 4) == 0) ? '~' : _POSIX_VDISABLE;
 122         autologin = -1;
 123
 124
 125 #if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
 126 #define IPSECOPT        "P:"
 127 #else
 128 #define IPSECOPT
 129 #endif
 130         while ((ch = getopt(argc, argv,
 131                             "468EKLNS:X:acde:fFk:l:n:rs:t:uxy" IPSECOPT)) != -1)
 132 #undef IPSECOPT
 133         {
 134                 switch(ch) {
 135                 case '4':
 136                         family = AF_INET;
 137                         break;
 138 #ifdef INET6
 139                 case '6':
 140                         family = AF_INET6;
 141                         break;
 142 #endif
 143                 case '8':
 144                         eight = 3;      /* binary output and input */
 145                         break;
 146                 case 'E':
 147                         rlogin = escape = _POSIX_VDISABLE;
 148                         break;
 149                 case 'K':
 150                         break;
 151                 case 'L':
 152                         eight |= 2;     /* binary output only */
 153                         break;
 154                 case 'N':
 155                         doaddrlookup = 0;
 156                         break;
 157                 case 'S':
 158                     {
 159 #ifdef  HAS_GETTOS
 160                         extern int tos;
 161
 162                         if ((tos = parsetos(optarg, "tcp")) < 0)
 163                                 fprintf(stderr, "%s%s%s%s\n",
 164                                         prompt, ": Bad TOS argument '",
 165                                         optarg,
 166                                         "; will try to use default TOS");
 167 #else
 168                         fprintf(stderr,
 169                            "%s: Warning: -S ignored, no parsetos() support.\n",
 170                                                                 prompt);
 171 #endif
 172                     }
 173                         break;
 174                 case 'X':
 175                         break;
 176                 case 'a':
 177                         autologin = 1;
 178                         break;
 179                 case 'c':
 180                         skiprc = 1;
 181                         break;
 182                 case 'd':
 183                         debug = 1;
 184                         break;
 185                 case 'e':
 186                         set_escape_char(optarg);
 187                         break;
 188                 case 'f':
 189                         fprintf(stderr,
 190                          "%s: Warning: -f ignored, no Kerberos V5 support.\n",
 191                                 prompt);
 192                         break;
 193                 case 'F':
 194                         fprintf(stderr,
 195                          "%s: Warning: -F ignored, no Kerberos V5 support.\n",
 196                                 prompt);
 197                         break;
 198                 case 'k':
 199                         fprintf(stderr,
 200                            "%s: Warning: -k ignored, no Kerberos V4 support.\n",
 201                                                                 prompt);
 202                         break;
 203                 case 'l':
 204                         autologin = 1;
 205                         user = optarg;
 206                         break;
 207                 case 'n':
 208                                 SetNetTrace(optarg);
 209                         break;
 210                 case 'r':
 211                         rlogin = '~';
 212                         break;
 213                 case 's':
 214                         src_addr = optarg;
 215                         break;
 216                 case 'u':
 217                         family = AF_UNIX;
 218                         break;
 219                 case 'x':
 220                         fprintf(stderr,
 221                             "%s: Warning: -x ignored, no ENCRYPT support.\n",
 222                                                                 prompt);
 223                         break;
 224                 case 'y':
 225                         fprintf(stderr,
 226                             "%s: Warning: -y ignored, no ENCRYPT support.\n",
 227                                                                 prompt);
 228                         break;
 229 #if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
 230                 case 'P':
 231                         if (!strncmp("in", optarg, 2))
 232                                 ipsec_policy_in = strdup(optarg);
 233                         else if (!strncmp("out", optarg, 3))
 234                                 ipsec_policy_out = strdup(optarg);
 235                         else
 236                                 usage();
 237                         break;
 238 #endif
 239                 case '?':
 240                 default:
 241                         usage();
 242                         /* NOTREACHED */
 243                 }
 244         }
 245         if (autologin == -1)
 246                 autologin = (rlogin == _POSIX_VDISABLE) ? 0 : 1;
 247
 248         argc -= optind;
 249         argv += optind;
 250
 251         if (argc) {
 252                 char *args[9], **argp = args;
 253
 254                 if (argc > 2)
 255                         usage();
 256                 *argp++ = prompt;
 257                 if (user) {
 258                         *argp++ = strdup("-l");
 259                         *argp++ = user;
 260                 }
 261                 if (src_addr) {
 262                         *argp++ = strdup("-s");
 263                         *argp++ = src_addr;
 264                 }
 265                 *argp++ = argv[0];              /* host */
 266                 if (argc > 1)
 267                         *argp++ = argv[1];      /* port */
 268                 *argp = 0;
 269
 270                 if (setjmp(toplevel) != 0)
 271                         Exit(0);
 272                 if (tn(argp - args, args) == 1)
 273                         return (0);
 274                 else
 275                         return (1);
 276         }
 277         (void)setjmp(toplevel);
 278         for (;;) {
 279                         command(1, 0, 0);
 280         }
 281         return 0;
 282 }