4.3BSD-Reno/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 are permitted
 * provided that: (1) source distributions retain this entire copyright
 * notice and comment, and (2) distributions including binaries display
 * the following acknowledgement:  ``This product includes software
 * developed by the University of California, Berkeley and its contributors''
 * in the documentation or other materials provided with the distribution
 * and in all advertising materials mentioning features or use of this
 * software. 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef lint
static char sccsid[] = "@(#)get_addrs.c	5.6 (Berkeley) 6/1/90";
#endif /* not lint */

#include "talk_ctl.h"
#include <netdb.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;
}