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get_addrs.c revision 1.1 
      1 /*
      2  * Copyright (c) 1983 Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #ifndef lint
     35 static char sccsid[] = "@(#)get_addrs.c	5.7 (Berkeley) 3/1/91";
     36 #endif /* not lint */
     37 
     38 #include <sys/types.h>
     39 #include <sys/socket.h>
     40 #include <netinet/in.h>
     41 #include <protocols/talkd.h>
     42 #include <netdb.h>
     43 #include <stdio.h>
     44 #include "talk_ctl.h"
     45 
     46 get_addrs(my_machine_name, his_machine_name)
     47 	char *my_machine_name, *his_machine_name;
     48 {
     49 	struct hostent *hp;
     50 	struct servent *sp;
     51 
     52 	msg.pid = htonl(getpid());
     53 	/* look up the address of the local host */
     54 	hp = gethostbyname(my_machine_name);
     55 	if (hp == NULL) {
     56 		fprintf(stderr, "talk: %s: ", my_machine_name);
     57 		herror((char *)NULL);
     58 		exit(-1);
     59 	}
     60 	bcopy(hp->h_addr, (char *)&my_machine_addr, hp->h_length);
     61 	/*
     62 	 * If the callee is on-machine, just copy the
     63 	 * network address, otherwise do a lookup...
     64 	 */
     65 	if (strcmp(his_machine_name, my_machine_name)) {
     66 		hp = gethostbyname(his_machine_name);
     67 		if (hp == NULL) {
     68 			fprintf(stderr, "talk: %s: ", his_machine_name);
     69 			herror((char *)NULL);
     70 			exit(-1);
     71 		}
     72 		bcopy(hp->h_addr, (char *) &his_machine_addr, hp->h_length);
     73 	} else
     74 		his_machine_addr = my_machine_addr;
     75 	/* find the server's port */
     76 	sp = getservbyname("ntalk", "udp");
     77 	if (sp == 0) {
     78 		fprintf(stderr, "talk: %s/%s: service is not registered.\n",
     79 		     "ntalk", "udp");
     80 		exit(-1);
     81 	}
     82 	daemon_port = sp->s_port;
     83 }
     84