/*      $NetBSD: main.c,v 1.33 2024/11/03 10:43:27 rillig Exp $ */

/*
 * 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. 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.
 */

#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1988, 1990, 1993\
 The Regents of the University of California.  All rights reserved.");
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)main.c      8.3 (Berkeley) 5/30/95";
#else
__RCSID("$NetBSD: main.c,v 1.33 2024/11/03 10:43:27 rillig Exp $");
#endif
#endif /* not lint */

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

#include <unistd.h>

#include "ring.h"
#include "externs.h"
#include "defines.h"
#ifdef AUTHENTICATION
#include <libtelnet/auth.h>
#endif
#ifdef ENCRYPTION
#include <libtelnet/encrypt.h>
#endif

/* 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

#if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
char *ipsec_policy_in = NULL;
char *ipsec_policy_out = NULL;
#endif

int family = AF_UNSPEC;

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

    init_network();

    init_telnet();

    init_sys();

}

        void
usage(void)
{
        fprintf(stderr, "usage: %s %s%s%s%s\n",
            prompt,
#ifdef  AUTHENTICATION
            "[-4] [-6] [-8] [-E] [-K] [-L] [-N] [-S tos] [-X atype] [-a] [-c]",
            "\n\t[-d] [-e char] [-k realm] [-l user] [-f/-F] [-n tracefile] ",
#else
            "[-4] [-6] [-8] [-E] [-L] [-N] [-S tos] [-a] [-c] [-d] [-e char]",
            "\n\t[-l user] [-n tracefile] ",
#endif
            "[-r] ",
#ifdef  ENCRYPTION
            "[-x] "
#endif
#if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
            "\n\t[-P policy] [host-name [port]]"
#else
            "\n\t[host-name [port]]"
#endif
        );
        exit(1);
}

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


int
main(int argc, char *argv[])
{
        int ch;
        char *user;
#ifdef  FORWARD
        extern int forward_flags;
#endif  /* FORWARD */

        tninit();               /* Clear out things */

        TerminalSaveState();

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

        user = NULL;

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

#if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
#define IPSECOPT        "P:"
#else
#define IPSECOPT
#endif
        while ((ch = getopt(argc, argv, "468EKLNS:X:acde:fFk:l:n:rt:x"
                        IPSECOPT)) != -1) {
#undef IPSECOPT
                switch(ch) {
                case '4':
                        family = AF_INET;
                        break;
                case '6':
                        family = AF_INET6;
                        break;
                case '8':
                        eight = 3;      /* binary output and input */
                        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 'N':
                        doaddrlookup = 0;
                        break;
                case 'S':
                    {
                        fprintf(stderr,
                           "%s: Warning: -S ignored, no parsetos() support.\n",
                                                                prompt);
                    }
                        break;
                case 'X':
#ifdef  AUTHENTICATION
                        auth_disable_name(optarg);
#endif
                        break;
                case 'a':
                        autologin = 1;
                        break;
                case 'c':
                        skiprc = 1;
                        break;
                case 'd':
                        telnet_debug = 1;
                        break;
                case 'e':
                        set_escape_char(optarg);
                        break;
                case 'f':
#if defined(AUTHENTICATION) && defined(KRB5) && defined(FORWARD)
                        if (forward_flags & OPTS_FORWARD_CREDS) {
                            fprintf(stderr,
                                    "%s: Only one of -f and -F allowed.\n",
                                    prompt);
                            usage();
                        }
                        forward_flags |= OPTS_FORWARD_CREDS;
#else
                        fprintf(stderr,
                         "%s: Warning: -f ignored, no Kerberos V5 support.\n",
                                prompt);
#endif
                        break;
                case 'F':
#if defined(AUTHENTICATION) && defined(KRB5) && defined(FORWARD)
                        if (forward_flags & OPTS_FORWARD_CREDS) {
                            fprintf(stderr,
                                    "%s: Only one of -f and -F allowed.\n",
                                    prompt);
                            usage();
                        }
                        forward_flags |= OPTS_FORWARD_CREDS;
                        forward_flags |= OPTS_FORWARDABLE_CREDS;
#else
                        fprintf(stderr,
                         "%s: Warning: -F ignored, no Kerberos V5 support.\n",
                                prompt);
#endif
                        break;
                case 'k':
                        fprintf(stderr,
                           "%s: Warning: -k ignored, no Kerberos V4 support.\n",
                                                                prompt);
                        break;
                case 'l':
                        if(autologin == 0) {
                                autologin = -1;
                        }
                        user = optarg;
                        break;
                case 'n':
                                SetNetTrace(optarg);
                        break;
                case 'r':
                        rlogin = '~';
                        break;
                case 't':
                        fprintf(stderr,
                           "%s: Warning: -t ignored, no TN3270 support.\n",
                                                                prompt);
                        break;
                case 'x':
#ifdef  ENCRYPTION
                        encrypt_auto(1);
                        decrypt_auto(1);
#else   /* ENCRYPTION */
                        fprintf(stderr,
                            "%s: Warning: -x ignored, no ENCRYPT support.\n",
                                                                prompt);
#endif  /* ENCRYPTION */
                        break;
#if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
                case 'P':
                        if (!strncmp("in", optarg, 2))
                                ipsec_policy_in = strdup(optarg);
                        else if (!strncmp("out", optarg, 3)) 
                                ipsec_policy_out = strdup(optarg);
                        else
                                usage();
                        break;
#endif
                case '?':
                default:
                        usage();
                        /* NOTREACHED */
                }
        }

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

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

        argc -= optind;
        argv += optind;

        if (argc) {
                static char ml[] = "-l";
                char *args[7];
                char ** volatile argp;  /* avoid longjmp clobbering */

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

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