usr/src/usr.bin/talk/get_addrs.c

/*
 * Copyright (c) 1983 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
static char sccsid[] = "@(#)get_addrs.c 5.7 (Berkeley) 3/1/91";
#endif /* not lint */

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <protocols/talkd.h>
#include <netdb.h>
#include <stdio.h>
#include "talk_ctl.h"

get_addrs(my_machine_name, his_machine_name)
        char *my_machine_name, *his_machine_name;
{
        struct hostent *hp;
        struct servent *sp;

        msg.pid = htonl(getpid());
        /* look up the address of the local host */
        hp = gethostbyname(my_machine_name);
        if (hp == NULL) {
                fprintf(stderr, "talk: %s: ", my_machine_name);
                herror((char *)NULL);
                exit(-1);
        }
        bcopy(hp->h_addr, (char *)&my_machine_addr, hp->h_length);
        /*
         * If the callee is on-machine, just copy the
         * network address, otherwise do a lookup...
         */
        if (strcmp(his_machine_name, my_machine_name)) {
                hp = gethostbyname(his_machine_name);
                if (hp == NULL) {
                        fprintf(stderr, "talk: %s: ", his_machine_name);
                        herror((char *)NULL);
                        exit(-1);
                }
                bcopy(hp->h_addr, (char *) &his_machine_addr, hp->h_length);
        } else
                his_machine_addr = my_machine_addr;
        /* find the server's port */
        sp = getservbyname("ntalk", "udp");
        if (sp == 0) {
                fprintf(stderr, "talk: %s/%s: service is not registered.\n",
                     "ntalk", "udp");
                exit(-1);
        }
        daemon_port = sp->s_port;
}