1 /* $OpenBSD: get_addrs.c,v 1.8 2009/10/27 23:59:44 deraadt Exp $ */ 2 /* $NetBSD: get_addrs.c,v 1.3 1994/12/09 02:14:14 jtc Exp $ */ 3 4 /* 5 * Copyright (c) 1983, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include "talk.h" 34 #include <netdb.h> 35 #include <stdio.h> 36 #include <unistd.h> 37 #include "talk_ctl.h" 38 39 void 40 get_addrs(my_machine_name, his_machine_name) 41 char *my_machine_name, *his_machine_name; 42 { 43 struct hostent *hp; 44 struct servent *sp; 45 46 msg.pid = htonl(getpid()); 47 /* look up the address of the local host */ 48 hp = gethostbyname(my_machine_name); 49 if (hp == NULL) 50 errx(1, "%s: %s", my_machine_name, hstrerror(h_errno)); 51 bcopy(hp->h_addr, (char *)&my_machine_addr, hp->h_length); 52 /* 53 * If the callee is on-machine, just copy the 54 * network address, otherwise do a lookup... 55 */ 56 if (strcmp(his_machine_name, my_machine_name)) { 57 hp = gethostbyname(his_machine_name); 58 if (hp == NULL) 59 errx(1, "%s: %s", his_machine_name, hstrerror(h_errno)); 60 bcopy(hp->h_addr, (char *) &his_machine_addr, hp->h_length); 61 } else 62 his_machine_addr = my_machine_addr; 63 /* find the server's port */ 64 sp = getservbyname("ntalk", "udp"); 65 if (sp == NULL) 66 errx(1, "ntalk/udp: service is not registered."); 67 daemon_port = sp->s_port; 68 } 69