/*      $OpenBSD: main.c,v 1.37 2022/12/04 23:50:49 cheloha Exp $       */
/*      $NetBSD: main.c,v 1.5 1996/02/28 21:04:05 thorpej 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 "telnet_locl.h"

#include <sys/socket.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

int family = AF_UNSPEC;
int rtableid = -1;

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

    init_network();

    init_telnet();

    init_sys();
}

static __dead void
usage(void)
{
        extern char *__progname;

        (void)fprintf(stderr,
            "usage: %s [-4678acDEKLr] [-b hostalias] [-e escapechar] "
            "[-l user]\n"
            "\t[-n tracefile] [-V rtable] [host [port]]\n",
            __progname);

        exit(1);
}

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

int
main(int argc, char *argv[])
{
        int ch;
        extern char *__progname;
        char *user, *alias;
        const char *errstr;

        tninit();               /* Clear out things */

        TerminalSaveState();

        prompt = __progname;

        user = alias = NULL;

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

        autologin = -1;

        while ((ch = getopt(argc, argv, "4678ab:cDEe:KLl:n:rV:"))
            != -1) {
                switch(ch) {
                case '4':
                        family = AF_INET;
                        break;
                case '6':
                        family = AF_INET6;
                        break;
                case '7':
                        eight = 0;
                        break;
                case '8':
                        eight = 3;      /* binary output and input */
                        break;
                case 'a':
                        autologin = 1;
                        break;
                case 'b':
                        alias = optarg;
                        break;
                case 'c':
                        skiprc = 1;
                        break;
                case 'D': {
                        /* sometimes we don't want a mangled display */
                        char *p;
                        if((p = getenv("DISPLAY")))
                                env_define("DISPLAY", (unsigned char*)p);
                        break;
                }
                case 'E':
                        rlogin = escape = _POSIX_VDISABLE;
                        break;
                case 'e':
                        set_escape_char(optarg);
                        break;
                case 'K':
                        autologin = 0;
                        break;
                case 'L':
                        eight |= 2;     /* binary output only */
                        break;
                case 'l':
                        autologin = -1;
                        user = optarg;
                        break;
                case 'n':
                        SetNetTrace(optarg);
                        break;
                case 'r':
                        rlogin = '~';
                        break;
                case 'V':
                        rtableid = (int)strtonum(optarg, 0,
                            RT_TABLEID_MAX, &errstr);
                        if (errstr) {
                                fprintf(stderr, "%s: Warning: "
                                    "-V ignored, rtable %s: %s\n",
                                    prompt, errstr, optarg);
                        }
                        break;
                default:
                        usage();
                }
        }

        if (rtableid >= 0)
                if (setrtable(rtableid) == -1) {
                        perror("setrtable");
                        exit(1);
                }

        if (pledge("stdio rpath wpath getpw dns inet tty", NULL) == -1) {
                perror("pledge");
                exit(1);
        }

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

        argc -= optind;
        argv += optind;

        if (argc) {
                char *args[8], **argp = args;

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

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