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get_addrs.c revision 1.4 
      1 /*	$NetBSD: get_addrs.c,v 1.4 1997/10/20 00:23:18 lukem Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1983, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 #ifndef lint
     38 #if 0
     39 static char sccsid[] = "@(#)get_addrs.c	8.1 (Berkeley) 6/6/93";
     40 #endif
     41 __RCSID("$NetBSD: get_addrs.c,v 1.4 1997/10/20 00:23:18 lukem Exp $");
     42 #endif /* not lint */
     43 
     44 #include "talk.h"
     45 #include <netdb.h>
     46 #include <stdio.h>
     47 #include <unistd.h>
     48 #include "talk_ctl.h"
     49 
     50 void
     51 get_addrs(my_machine_name, his_machine_name)
     52 	char *my_machine_name, *his_machine_name;
     53 {
     54 	struct hostent *hp;
     55 	struct servent *sp;
     56 
     57 	msg.pid = htonl(getpid());
     58 	/* look up the address of the local host */
     59 	hp = gethostbyname(my_machine_name);
     60 	if (hp == NULL) {
     61 		fprintf(stderr, "talk: %s: ", my_machine_name);
     62 		herror((char *)NULL);
     63 		exit(-1);
     64 	}
     65 	memmove((char *)&my_machine_addr, hp->h_addr, hp->h_length);
     66 	/*
     67 	 * If the callee is on-machine, just copy the
     68 	 * network address, otherwise do a lookup...
     69 	 */
     70 	if (strcmp(his_machine_name, my_machine_name)) {
     71 		hp = gethostbyname(his_machine_name);
     72 		if (hp == NULL) {
     73 			fprintf(stderr, "talk: %s: ", his_machine_name);
     74 			herror((char *)NULL);
     75 			exit(-1);
     76 		}
     77 		memmove((char *) &his_machine_addr, hp->h_addr, hp->h_length);
     78 	} else
     79 		his_machine_addr = my_machine_addr;
     80 	/* find the server's port */
     81 	sp = getservbyname("ntalk", "udp");
     82 	if (sp == 0) {
     83 		fprintf(stderr, "talk: %s/%s: service is not registered.\n",
     84 		     "ntalk", "udp");
     85 		exit(-1);
     86 	}
     87 	daemon_port = sp->s_port;
     88 }
     89