get_addrs.c revision 1590
11590Srgrimes/* 21590Srgrimes * Copyright (c) 1983, 1993 31590Srgrimes * The Regents of the University of California. All rights reserved. 41590Srgrimes * 51590Srgrimes * Redistribution and use in source and binary forms, with or without 61590Srgrimes * modification, are permitted provided that the following conditions 71590Srgrimes * are met: 81590Srgrimes * 1. Redistributions of source code must retain the above copyright 91590Srgrimes * notice, this list of conditions and the following disclaimer. 101590Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111590Srgrimes * notice, this list of conditions and the following disclaimer in the 121590Srgrimes * documentation and/or other materials provided with the distribution. 131590Srgrimes * 3. All advertising materials mentioning features or use of this software 141590Srgrimes * must display the following acknowledgement: 151590Srgrimes * This product includes software developed by the University of 161590Srgrimes * California, Berkeley and its contributors. 171590Srgrimes * 4. Neither the name of the University nor the names of its contributors 181590Srgrimes * may be used to endorse or promote products derived from this software 191590Srgrimes * without specific prior written permission. 201590Srgrimes * 211590Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 221590Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 231590Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 241590Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 251590Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 261590Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 271590Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 281590Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 291590Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 301590Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 311590Srgrimes * SUCH DAMAGE. 321590Srgrimes */ 331590Srgrimes 341590Srgrimes#ifndef lint 351590Srgrimesstatic char sccsid[] = "@(#)get_addrs.c 8.1 (Berkeley) 6/6/93"; 361590Srgrimes#endif /* not lint */ 371590Srgrimes 381590Srgrimes#include <sys/types.h> 391590Srgrimes#include <sys/socket.h> 401590Srgrimes#include <netinet/in.h> 411590Srgrimes#include <protocols/talkd.h> 421590Srgrimes#include <netdb.h> 431590Srgrimes#include <stdio.h> 441590Srgrimes#include "talk_ctl.h" 451590Srgrimes 461590Srgrimesget_addrs(my_machine_name, his_machine_name) 471590Srgrimes char *my_machine_name, *his_machine_name; 481590Srgrimes{ 491590Srgrimes struct hostent *hp; 501590Srgrimes struct servent *sp; 511590Srgrimes 521590Srgrimes msg.pid = htonl(getpid()); 531590Srgrimes /* look up the address of the local host */ 541590Srgrimes hp = gethostbyname(my_machine_name); 551590Srgrimes if (hp == NULL) { 561590Srgrimes fprintf(stderr, "talk: %s: ", my_machine_name); 571590Srgrimes herror((char *)NULL); 581590Srgrimes exit(-1); 591590Srgrimes } 601590Srgrimes bcopy(hp->h_addr, (char *)&my_machine_addr, hp->h_length); 611590Srgrimes /* 621590Srgrimes * If the callee is on-machine, just copy the 631590Srgrimes * network address, otherwise do a lookup... 641590Srgrimes */ 651590Srgrimes if (strcmp(his_machine_name, my_machine_name)) { 661590Srgrimes hp = gethostbyname(his_machine_name); 671590Srgrimes if (hp == NULL) { 681590Srgrimes fprintf(stderr, "talk: %s: ", his_machine_name); 691590Srgrimes herror((char *)NULL); 701590Srgrimes exit(-1); 711590Srgrimes } 721590Srgrimes bcopy(hp->h_addr, (char *) &his_machine_addr, hp->h_length); 731590Srgrimes } else 741590Srgrimes his_machine_addr = my_machine_addr; 751590Srgrimes /* find the server's port */ 761590Srgrimes sp = getservbyname("ntalk", "udp"); 771590Srgrimes if (sp == 0) { 781590Srgrimes fprintf(stderr, "talk: %s/%s: service is not registered.\n", 791590Srgrimes "ntalk", "udp"); 801590Srgrimes exit(-1); 811590Srgrimes } 821590Srgrimes daemon_port = sp->s_port; 831590Srgrimes} 84