1 /* $OpenBSD: get_addrs.c,v 1.9 2010/08/12 23:31:29 tedu 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(char *my_machine_name, char *his_machine_name) 41 { 42 struct hostent *hp; 43 struct servent *sp; 44 45 msg.pid = htonl(getpid()); 46 /* look up the address of the local host */ 47 hp = gethostbyname(my_machine_name); 48 if (hp == NULL) 49 errx(1, "%s: %s", my_machine_name, hstrerror(h_errno)); 50 bcopy(hp->h_addr, &my_machine_addr, hp->h_length); 51 /* 52 * If the callee is on-machine, just copy the 53 * network address, otherwise do a lookup... 54 */ 55 if (strcmp(his_machine_name, my_machine_name)) { 56 hp = gethostbyname(his_machine_name); 57 if (hp == NULL) 58 errx(1, "%s: %s", his_machine_name, hstrerror(h_errno)); 59 bcopy(hp->h_addr, &his_machine_addr, hp->h_length); 60 } else 61 his_machine_addr = my_machine_addr; 62 /* find the server's port */ 63 sp = getservbyname("ntalk", "udp"); 64 if (sp == NULL) 65 errx(1, "ntalk/udp: service is not registered."); 66 daemon_port = sp->s_port; 67 } 68