/*
 * Copyright (c) 1988, 1990, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

static char *copyright[] = {
    "@(#) Copyright (c) 1988, 1990, 1993\n"
    "\tThe Regents of the University of California.  All rights reserved.\n",
    (char*)copyright
};

#include "telnet_locl.h"
RCSID("$Id$");

#if KRB5
#define FORWARD
#endif

/*
 * Initialize variables.
 */
void
tninit(void)
{
    init_terminal();

    init_network();

    init_telnet();

    init_sys();
}

static void
usage(int exit_code)
{
  fprintf(stderr, "Usage: %s %s%s%s%s\n", prompt,
#ifdef  AUTHENTICATION
          "[-8] [-E] [-K] [-L] [-G] [-S tos] [-X atype] [-a] [-c] [-d] [-e char]",
          "\n\t[-k realm] [-l user] [-f/-F] [-n tracefile] ",
#else
          "[-8] [-E] [-L] [-S tos] [-a] [-c] [-d] [-e char] [-l user]",
          "\n\t[-n tracefile]",
#endif
          "[-r] ",
#ifdef  ENCRYPTION
          "[-x] [host-name [port]]"
#else
          "[host-name [port]]"
#endif
    );
  exit(exit_code);
}

/*
 * main.  Parse arguments, invoke the protocol or command parser.
 */


#ifdef  FORWARD
int forward_option = 0; /* forward flags set from command line */
#endif  /* FORWARD */
void
set_forward_options(void)
{
#ifdef FORWARD
        switch(forward_option) {
        case 'f':
                kerberos5_set_forward(1);
                kerberos5_set_forwardable(0);
                break;
        case 'F':
                kerberos5_set_forward(1);
                kerberos5_set_forwardable(1);
                break;
        case 'G':
                kerberos5_set_forward(0);
                kerberos5_set_forwardable(0);
                break;
        default:
                break;
        }
#endif
}

#ifdef KRB5
#define Authenticator asn1_Authenticator
#include <krb5.h>
static void
krb5_init(void)
{
    krb5_context context;
    krb5_error_code ret;
    krb5_boolean ret_val;

    ret = krb5_init_context(&context);
    if (ret)
        return;

#if defined(AUTHENTICATION) && defined(FORWARD)
    krb5_appdefault_boolean(context, NULL,
                            NULL, "forward",
                            0, &ret_val);
    if (ret_val)
            kerberos5_set_forward(1);
    krb5_appdefault_boolean(context, NULL,
                            NULL, "forwardable",
                            0, &ret_val);
    if (ret_val)
            kerberos5_set_forwardable(1);
#endif
#ifdef  ENCRYPTION
    krb5_appdefault_boolean(context, NULL,
                            NULL, "encrypt",
                            0, &ret_val);
    if (ret_val) {
          encrypt_auto(1);
          decrypt_auto(1);
          wantencryption = 1;
          EncryptVerbose(1);
        }
#endif

    krb5_free_context(context);
}
#endif

int
main(int argc, char **argv)
{
        int ch;
        char *user;

        setprogname(argv[0]);

#ifdef KRB5
        krb5_init();
#endif

        tninit();               /* Clear out things */

        TerminalSaveState();

        if ((prompt = strrchr(argv[0], '/')))
                ++prompt;
        else
                prompt = argv[0];

        user = NULL;

        rlogin = (strncmp(prompt, "rlog", 4) == 0) ? '~' : _POSIX_VDISABLE;

        /*
         * if AUTHENTICATION and ENCRYPTION is set autologin will be
         * se to true after the getopt switch; unless the -K option is
         * passed
         */
        autologin = -1;

        if (argc == 2 && strcmp(argv[1], "--version") == 0) {
            print_version(NULL);
            exit(0);
        }
        if (argc == 2 && strcmp(argv[1], "--help") == 0)
            usage(0);


        while((ch = getopt(argc, argv,
                           "78DEKLS:X:abcde:fFk:l:n:rxG")) != -1) {
                switch(ch) {
                case '8':
                        eight = 3;      /* binary output and input */
                        break;
                case '7':
                        eight = 0;
                        break;
                case 'b':
                    binary = 3;
                    break;
                case 'D': {
                    /* sometimes we don't want a mangled display */
                    char *p;
                    if((p = getenv("DISPLAY")))
                        env_define((unsigned char*)"DISPLAY", (unsigned char*)p);
                    break;
                }
                case 'E':
                        rlogin = escape = _POSIX_VDISABLE;
                        break;
                case 'K':
#ifdef  AUTHENTICATION
                        autologin = 0;
#endif
                        break;
                case 'L':
                        eight |= 2;     /* binary output only */
                        break;
                case 'S':
                    {
#ifdef  HAVE_PARSETOS
                        extern int tos;

                        if ((tos = parsetos(optarg, "tcp")) < 0)
                                fprintf(stderr, "%s%s%s%s\n",
                                        prompt, ": Bad TOS argument '",
                                        optarg,
                                        "; will try to use default TOS");
#else
                        fprintf(stderr,
                           "%s: Warning: -S ignored, no parsetos() support.\n",
                                                                prompt);
#endif
                    }
                        break;
                case 'X':
#ifdef  AUTHENTICATION
                        auth_disable_name(optarg);
#endif
                        break;
                case 'a':
                        autologin = 1;
                        break;
                case 'c':
                        skiprc = 1;
                        break;
                case 'd':
                        debug = 1;
                        break;
                case 'e':
                        set_escape_char(optarg);
                        break;
                case 'f':
                case 'F':
                case 'G':
#if defined(AUTHENTICATION) && defined(KRB5) && defined(FORWARD)
                        if (forward_option) {
                            fprintf(stderr,
                                    "%s: Only one of -f, -F and -G allowed.\n",
                                    prompt);
                            usage(1);
                        }
                        forward_option = ch;
#else
                        fprintf(stderr,
                         "%s: Warning: -%c ignored, no Kerberos V5 support.\n",
                                prompt, ch);
#endif
                        break;
                case 'k':
                    fprintf(stderr,
                            "%s: Warning: -k ignored, no Kerberos V4 support.\n",
                            prompt);
                    break;
                case 'l':
                  if(autologin == 0){
                    fprintf(stderr, "%s: Warning: -K ignored\n", prompt);
                    autologin = -1;
                  }
                        user = optarg;
                        break;
                case 'n':
                                SetNetTrace(optarg);
                        break;
                case 'r':
                        rlogin = '~';
                        break;
                case 'x':
#ifdef  ENCRYPTION
                        encrypt_auto(1);
                        decrypt_auto(1);
                        wantencryption = 1;
                        EncryptVerbose(1);
#else
                        fprintf(stderr,
                            "%s: Warning: -x ignored, no ENCRYPT support.\n",
                                                                prompt);
#endif
                        break;

                case '?':
                default:
                        usage(1);
                        /* NOTREACHED */
                }
        }

        if (autologin == -1) {          /* esc@magic.fi; force  */
#if defined(AUTHENTICATION)
                autologin = 1;
#endif
#if defined(ENCRYPTION)
                encrypt_auto(1);
                decrypt_auto(1);
                wantencryption = -1;
#endif
        }

        if (autologin == -1)
                autologin = (rlogin == _POSIX_VDISABLE) ? 0 : 1;

        argc -= optind;
        argv += optind;

        if (argc) {
                char *args[7], **argp = args;

                if (argc > 2)
                        usage(1);
                *argp++ = prompt;
                if (user) {
                        *argp++ = "-l";
                        *argp++ = user;
                }
                *argp++ = argv[0];              /* host */
                if (argc > 1)
                        *argp++ = argv[1];      /* port */
                *argp = 0;

                if (setjmp(toplevel) != 0)
                        Exit(0);
                if (tn(argp - args, args) == 1)
                        return (0);
                else
                        return (1);
        }
        setjmp(toplevel);
        for (;;) {
                        command(1, 0, 0);
        }
}