1 /* $NetBSD: get_addrs.c,v 1.7 2001/04/06 11:13:46 wiz 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 1.7 2001/04/06 11:13:46 wiz Exp $"); 42 #endif /* not lint */ 43 44 #include "talk.h" 45 #include <netdb.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <unistd.h> 49 #include "talk_ctl.h" 50 51 void 52 get_addrs(my_machine_name, his_machine_name) 53 const char *my_machine_name, *his_machine_name; 54 { 55 struct hostent *hp; 56 struct servent *sp; 57 58 msg.pid = htonl(getpid()); 59 /* look up the address of the local host */ 60 hp = gethostbyname(my_machine_name); 61 if (hp == NULL) { 62 fprintf(stderr, "talk: %s: ", my_machine_name); 63 herror((char *)NULL); 64 exit(1); 65 } 66 memmove((char *)&my_machine_addr, hp->h_addr, hp->h_length); 67 /* 68 * If the callee is on-machine, just copy the 69 * network address, otherwise do a lookup... 70 */ 71 if (strcmp(his_machine_name, my_machine_name)) { 72 hp = gethostbyname(his_machine_name); 73 if (hp == NULL) { 74 fprintf(stderr, "talk: %s: ", his_machine_name); 75 herror((char *)NULL); 76 exit(1); 77 } 78 memmove((char *) &his_machine_addr, hp->h_addr, hp->h_length); 79 } else 80 his_machine_addr = my_machine_addr; 81 /* find the server's port */ 82 sp = getservbyname("ntalk", "udp"); 83 if (sp == 0) { 84 fprintf(stderr, "talk: %s/%s: service is not registered.\n", 85 "ntalk", "udp"); 86 exit(1); 87 } 88 daemon_port = sp->s_port; 89 } 90