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
  34 #include <sys/cdefs.h>
  35
  36 __FBSDID("$FreeBSD: src/usr.bin/telnet/main.c,v 1.10.2.5 2002/04/13 11:07:13 markm Exp $");
  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
  53 /* These values need to be the same as defined in libtelnet/kerberos5.c */
  54 /* Either define them in both places, or put in some common header file. */
  55 #define OPTS_FORWARD_CREDS      0x00000002
  56 #define OPTS_FORWARDABLE_CREDS  0x00000001
  57
  58 #if 0
  59 #define FORWARD
  60 #endif
  61
  62 #if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
  63 char *ipsec_policy_in = NULL;
  64 char *ipsec_policy_out = NULL;
  65 #endif
  66
  67 int family = AF_UNSPEC;
  68
  69 /*
  70  * Initialize variables.
  71  */
  72 void
  73 tninit(void)
  74 {
  75     init_terminal();
  76
  77     init_network();
  78
  79     init_telnet();
  80
  81     init_sys();
  82 }
  83
  84 static void
  85 usage(void)
  86 {
  87         fprintf(stderr, "Usage: %s %s%s%s%s\n",
  88             prompt,
  89             "[-4] [-6] [-8] [-E] [-L] [-N] [-S tos] [-c] [-d]",
  90             "\n\t[-e char] [-l user] [-n tracefile] ",
  91             "[-r] [-s src_addr] [-u] ",
  92 #if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
  93             "[-P policy] "
  94 #endif
  95             "[host-name [port]]"
  96         );
  97         exit(1);
  98 }
  99
 100 /*
 101  * main.  Parse arguments, invoke the protocol or command parser.
 102  */
 103
 104 int
 105 main(int argc, char *argv[])
 106 {
 107         int ch;
 108         char *user;
 109         char *src_addr = NULL;
 110 #ifdef  FORWARD
 111         extern int forward_flags;
 112 #endif  /* FORWARD */
 113
 114         tninit();               /* Clear out things */
 115
 116         TerminalSaveState();
 117
 118         if ((prompt = strrchr(argv[0], '/')))
 119                 ++prompt;
 120         else
 121                 prompt = argv[0];
 122
 123         user = NULL;
 124
 125         rlogin = (strncmp(prompt, "rlog", 4) == 0) ? '~' : _POSIX_VDISABLE;
 126         autologin = -1;
 127
 128
 129 #if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
 130 #define IPSECOPT        "P:"
 131 #else
 132 #define IPSECOPT
 133 #endif
 134         while ((ch = getopt(argc, argv,
 135                             "468EKLNS:X:acde:fFk:l:n:rs:t:uxy" IPSECOPT)) != -1)
 136 #undef IPSECOPT
 137         {
 138                 switch(ch) {
 139                 case '4':
 140                         family = AF_INET;
 141                         break;
 142 #ifdef INET6
 143                 case '6':
 144                         family = AF_INET6;
 145                         break;
 146 #endif
 147                 case '8':
 148                         eight = 3;      /* binary output and input */
 149                         break;
 150                 case 'E':
 151                         rlogin = escape = _POSIX_VDISABLE;
 152                         break;
 153                 case 'K':
 154                         break;
 155                 case 'L':
 156                         eight |= 2;     /* binary output only */
 157                         break;
 158                 case 'N':
 159                         doaddrlookup = 0;
 160                         break;
 161                 case 'S':
 162                     {
 163 #ifdef  HAS_GETTOS
 164                         extern int tos;
 165
 166                         if ((tos = parsetos(optarg, "tcp")) < 0)
 167                                 fprintf(stderr, "%s%s%s%s\n",
 168                                         prompt, ": Bad TOS argument '",
 169                                         optarg,
 170                                         "; will try to use default TOS");
 171 #else
 172                         fprintf(stderr,
 173                            "%s: Warning: -S ignored, no parsetos() support.\n",
 174                                                                 prompt);
 175 #endif
 176                     }
 177                         break;
 178                 case 'X':
 179                         break;
 180                 case 'a':
 181                         autologin = 1;
 182                         break;
 183                 case 'c':
 184                         skiprc = 1;
 185                         break;
 186                 case 'd':
 187                         debug = 1;
 188                         break;
 189                 case 'e':
 190                         set_escape_char(optarg);
 191                         break;
 192                 case 'f':
 193                         fprintf(stderr,
 194                          "%s: Warning: -f ignored, no Kerberos V5 support.\n",
 195                                 prompt);
 196                         break;
 197                 case 'F':
 198                         fprintf(stderr,
 199                          "%s: Warning: -F ignored, no Kerberos V5 support.\n",
 200                                 prompt);
 201                         break;
 202                 case 'k':
 203                         fprintf(stderr,
 204                            "%s: Warning: -k ignored, no Kerberos V4 support.\n",
 205                                                                 prompt);
 206                         break;
 207                 case 'l':
 208                         autologin = 1;
 209                         user = optarg;
 210                         break;
 211                 case 'n':
 212                                 SetNetTrace(optarg);
 213                         break;
 214                 case 'r':
 215                         rlogin = '~';
 216                         break;
 217                 case 's':
 218                         src_addr = optarg;
 219                         break;
 220                 case 'u':
 221                         family = AF_UNIX;
 222                         break;
 223                 case 'x':
 224                         fprintf(stderr,
 225                             "%s: Warning: -x ignored, no ENCRYPT support.\n",
 226                                                                 prompt);
 227                         break;
 228                 case 'y':
 229                         fprintf(stderr,
 230                             "%s: Warning: -y ignored, no ENCRYPT support.\n",
 231                                                                 prompt);
 232                         break;
 233 #if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
 234                 case 'P':
 235                         if (!strncmp("in", optarg, 2))
 236                                 ipsec_policy_in = strdup(optarg);
 237                         else if (!strncmp("out", optarg, 3))
 238                                 ipsec_policy_out = strdup(optarg);
 239                         else
 240                                 usage();
 241                         break;
 242 #endif
 243                 case '?':
 244                 default:
 245                         usage();
 246                         /* NOTREACHED */
 247                 }
 248         }
 249         if (autologin == -1)
 250                 autologin = (rlogin == _POSIX_VDISABLE) ? 0 : 1;
 251
 252         argc -= optind;
 253         argv += optind;
 254
 255         if (argc) {
 256                 char *args[9], **argp = args;
 257
 258                 if (argc > 2)
 259                         usage();
 260                 *argp++ = prompt;
 261                 if (user) {
 262                         *argp++ = strdup("-l");
 263                         *argp++ = user;
 264                 }
 265                 if (src_addr) {
 266                         *argp++ = strdup("-s");
 267                         *argp++ = src_addr;
 268                 }
 269                 *argp++ = argv[0];              /* host */
 270                 if (argc > 1)
 271                         *argp++ = argv[1];      /* port */
 272                 *argp = 0;
 273
 274                 if (setjmp(toplevel) != 0)
 275                         Exit(0);
 276                 if (tn(argp - args, args) == 1)
 277                         return (0);
 278                 else
 279                         return (1);
 280         }
 281         (void)setjmp(toplevel);
 282         for (;;) {
 283                         command(1, 0, 0);
 284         }
 285         return 0;
 286 }