/*
 * Copyright 2002 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
 * Copyright (c) 1988, 1990 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.
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1988, 1990 Regents of the University of California.\n"
" All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)main.c      5.5 (Berkeley) 12/18/92";
#endif /* not lint */

#include <string.h>
#include <sys/types.h>

#include "ring.h"
#include "externs.h"
#include "defines.h"

/* These values need to be the same as defined in libtelnet/kerberos5.c */
/* Either define them in both places, or put in some common header file. */
#define OPTS_FORWARD_CREDS              0x00000002
#define OPTS_FORWARDABLE_CREDS          0x00000001

/*
 * This flag is incremented, if any of the
 * Kerberos command line options are used.
 */
int krb5auth_flag = 0;

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

        init_network();

        if (init_telnet() == 0)
                return (0);

        init_sys();

        return (1);
}

#if     defined(USE_TOS)
#define TELNET_OPTIONS  "8EKLS:X:acde:fFk:l:n:rt:x"
#else
#define TELNET_OPTIONS  "8EKLX:acde:fFk:l:n:rt:x"
#endif  /* USE_TOS */

static void
usage()
{
        (void) fprintf(stderr, "Usage: %s %s\n",
                prompt,
                " [-8] [-E] [-K] [-L] [-a] [-c] [-d] [-f/-F] [-r] [-x]"
                "\n\t[-e char] [-k realm] [-l user] [-n tracefile] [-X atype]"
                "\n\t[host-name [port]]");
        exit(1);
}

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


int
main(int argc, char *argv[])
{
        int ch;
        char *user;
        extern boolean_t auth_enable_encrypt;
        extern int forward_flags;

        /* Clear out things */
        if (tninit() == 0)
                return (EXIT_FAILURE);

        if (!isatty(fileno(stdin))) {
                setbuf(stdin, NULL);
        }
        if (!isatty(fileno(stdout))) {
                setbuf(stdout, NULL);
        }

        TerminalSaveState();

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

        user = NULL;

        rlogin = (strncmp(prompt, "rlog", 4) == 0) ? '~' : _POSIX_VDISABLE;
        autologin = -1;

        while ((ch = getopt(argc, argv, TELNET_OPTIONS)) != EOF) {
                switch (ch) {
                case 'K':
                        autologin_set = 1;
                        autologin = 0;
                        krb5auth_flag++;
                        break;
                case 'X':
                        auth_disable_name(optarg);
                        krb5auth_flag++;
                        break;
                case 'a':
                        autologin_set = 1;
                        autologin = 1;
                        krb5auth_flag++;
                        break;
                case 'f':
                        if (forward_flags & OPTS_FORWARD_CREDS) {
                            (void) fprintf(stderr, gettext(
                                "%s: Only one of -f "
                                "and -F allowed.\n"), prompt);
                            usage();
                        }
                        forward_flags |= OPTS_FORWARD_CREDS;
                        forward_flag_set = 1;
                        krb5auth_flag++;
                        break;
                case 'F':
                        if (forward_flags & OPTS_FORWARD_CREDS) {
                            (void) fprintf(stderr, gettext(
                                "%s: Only one of -f "
                                "and -F allowed.\n"), prompt);
                            usage();
                        }
                        forward_flags |= OPTS_FORWARD_CREDS;
                        forward_flags |= OPTS_FORWARDABLE_CREDS;
                        forwardable_flag_set = 1;
                        forward_flag = 1;
                        krb5auth_flag++;
                        break;
                case 'k':
                        set_krb5_realm(optarg);
                        krb5auth_flag++;
                        break;
                case 'x':
                        if (krb5_privacy_allowed()) {
                                encrypt_auto(1);
                                decrypt_auto(1);
                                wantencryption = B_TRUE;
                                autologin = 1;
                                autologin_set = 1;
                                auth_enable_encrypt = B_TRUE;
                                encrypt_flag_set = 1;
                                krb5auth_flag++;
                        } else {
                                (void) fprintf(stderr, gettext(
                                        "%s: Encryption not supported.\n"),
                                        prompt);
                                exit(1);
                        }
                        break;

                /* begin common options */
                case '8':
                        eight = 3;      /* binary output and input */
                        break;
                case 'E':
                        escape_valid = B_FALSE;
                        rlogin = escape = _POSIX_VDISABLE;
                        break;
                case 'L':
                        eight |= 2;     /* binary output only */
                        break;
#if USE_TOS
                case 'S':
                        (void) fprintf(stderr,
                            "%s: Warning: -S ignored, no parsetos() support.\n",
                            prompt);
                        break;
#endif /* USE_TOS */
                case 'c':
                        skiprc = 1;
                        break;
                case 'd':
                        debug = 1;
                        break;
                case 'e':
                        escape_valid = B_TRUE;
                        set_escape_char(optarg);
                        break;
                case 'l':
                        autologin_set = 1;
                        autologin = 1;
                        user = optarg;
                        break;
                case 'n':
                        SetNetTrace(optarg);
                        break;
                case 'r':
                        rlogin = '~';
                        break;
                case 't':
                        (void) fprintf(stderr,
                            "%s: Warning: -t ignored, no TN3270 support.\n",
                            prompt);
                        break;
                default:
                        usage();
                        /* NOTREACHED */
                }
        }
        if (autologin == -1)
                autologin = (rlogin == _POSIX_VDISABLE) ? 0 : 1;

        argc -= optind;
        argv += optind;

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

                if (argc > 2)
                        usage();
                *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(EXIT_SUCCESS);
                if (tn(argp - args, args) == 1)
                        return (EXIT_SUCCESS);
                else
                        return (EXIT_FAILURE);
        }
        (void) setjmp(toplevel);
        for (;;) {
                command(1, 0, 0);
        }
}