/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2017 Gary Mills
 * Copyright 1997 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*      Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T     */
/*        All Rights Reserved   */

/*
 * University Copyright- Copyright (c) 1982, 1986, 1988
 * The Regents of the University of California
 * All Rights Reserved
 *
 * University Acknowledgment- Portions of this document are derived from
 * software developed by the University of California, Berkeley, and its
 * contributors.
 */

#include "talk.h"
#include "ctl.h"
#include <locale.h>
#include <pwd.h>
#include <sys/systeminfo.h>

char *getlogin(), *ttyname(int);

extern CTL_MSG msg;

/*
 * Determine the local and remote user, tty, and machines
 */

struct hostent *gethostbyname();

void
get_names(argc, argv)
int argc;
char *argv[];
{
        char hostname[HOST_NAME_LENGTH + 1];
        char *rem_name;
        char *my_name;
        char *my_machine_name;
        char *rem_machine_name;
        char *rem_tty;
        char *ptr;
        int name_length;

        if (argc < 2) {
                fprintf(stderr,
                    "Usage: talk %s\n", gettext("address [terminal]"));
                exit(1);
        }
        if (!isatty(0)) {
                fprintf(stderr,
        gettext("Standard input must be a tty, not a pipe or a file\n"));
                exit(1);
        }

        if (!isatty(1)) {
                fprintf(stderr,
        gettext("Standard output must be a tty, not a pipe or a file\n"));
                exit(1);
        }

        if ((my_name = getlogin()) == NULL) {
        struct passwd *pass = getpwuid(getuid());
        if (pass != NULL)
                my_name = pass->pw_name;
        }
        if (my_name == NULL) {
                fprintf(stderr,
        gettext("Who are you?  You have no entry in /etc/utmp!  Aborting..\n"));
                exit(1);
        }

        name_length = HOST_NAME_LENGTH;
        (void) sysinfo(SI_HOSTNAME, hostname, name_length);
        my_machine_name = hostname;

        /*
         * check for, and strip out, the machine name of the target
         */

        for (ptr = argv[1]; *ptr != '\0' &&
                         *ptr != '@' &&
                         *ptr != ':' &&
                         *ptr != '!' &&
                         *ptr != '.'; ptr++) {
        }

        if (*ptr == '\0') {

                /* this is a local to local talk */

        rem_name = argv[1];
        rem_machine_name = my_machine_name;

        } else {

        if (*ptr == '@') {
                /* user@host */
                rem_name = argv[1];
                rem_machine_name = ptr + 1;
        } else {
                /* host.user or host!user or host:user */
                rem_name = ptr + 1;
                rem_machine_name = argv[1];
        }
        *ptr = '\0';
        }


        if (argc > 2) {
        rem_tty = argv[2];      /* tty name is arg 2 */
        } else {
        rem_tty = "";
        }

        get_addrs(my_machine_name, rem_machine_name);

        /* Load these useful values into the standard message header */

        msg.id_num = 0;

        strncpy(msg.l_name, my_name, NAME_SIZE);
        msg.l_name[NAME_SIZE - 1] = '\0';

        strncpy(msg.r_name, rem_name, NAME_SIZE);
        msg.r_name[NAME_SIZE - 1] = '\0';

        strncpy(msg.r_tty, rem_tty, TTY_SIZE);
        msg.r_tty[TTY_SIZE - 1] = '\0';
}