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 * 4. Neither the name of the University nor the names of its contributors 141590Srgrimes * may be used to endorse or promote products derived from this software 151590Srgrimes * without specific prior written permission. 161590Srgrimes * 171590Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 181590Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 191590Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 201590Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 211590Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 221590Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 231590Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 241590Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 251590Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 261590Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 271590Srgrimes * SUCH DAMAGE. 281590Srgrimes */ 291590Srgrimes 3087710Smarkm#include <sys/cdefs.h> 3187710Smarkm 3287710Smarkm__FBSDID("$FreeBSD$"); 3387710Smarkm 341590Srgrimes#ifndef lint 3587710Smarkmstatic const char sccsid[] = "@(#)ctl_transact.c 8.1 (Berkeley) 6/6/93"; 3632503Scharnier#endif 371590Srgrimes 3890868Smike#include <arpa/inet.h> 3990868Smike 401590Srgrimes#include <errno.h> 4187710Smarkm 4214443Sjoerg#include "talk.h" 431590Srgrimes#include "talk_ctl.h" 441590Srgrimes 451590Srgrimes#define CTL_WAIT 2 /* time to wait for a response, in seconds */ 461590Srgrimes 471590Srgrimes/* 481590Srgrimes * SOCKDGRAM is unreliable, so we must repeat messages if we have 49228992Suqs * not received an acknowledgement within a reasonable amount 501590Srgrimes * of time 511590Srgrimes */ 5214443Sjoergvoid 53178642Sdelphijctl_transact(struct in_addr target, CTL_MSG lmsg, int type, CTL_RESPONSE *rp) 541590Srgrimes{ 5514443Sjoerg fd_set read_mask, ctl_mask; 5614443Sjoerg int nready = 0, cc; 571590Srgrimes struct timeval wait; 581590Srgrimes 5987710Smarkm lmsg.type = type; 601590Srgrimes daemon_addr.sin_addr = target; 611590Srgrimes daemon_addr.sin_port = daemon_port; 6214443Sjoerg FD_ZERO(&ctl_mask); 6314443Sjoerg FD_SET(ctl_sockt, &ctl_mask); 641590Srgrimes 651590Srgrimes /* 661590Srgrimes * Keep sending the message until a response of 671590Srgrimes * the proper type is obtained. 681590Srgrimes */ 691590Srgrimes do { 701590Srgrimes wait.tv_sec = CTL_WAIT; 711590Srgrimes wait.tv_usec = 0; 721590Srgrimes /* resend message until a response is obtained */ 731590Srgrimes do { 7487710Smarkm cc = sendto(ctl_sockt, (char *)&lmsg, sizeof (lmsg), 0, 751590Srgrimes (struct sockaddr *)&daemon_addr, 761590Srgrimes sizeof (daemon_addr)); 7787710Smarkm if (cc != sizeof (lmsg)) { 781590Srgrimes if (errno == EINTR) 791590Srgrimes continue; 801590Srgrimes p_error("Error on write to talk daemon"); 811590Srgrimes } 821590Srgrimes read_mask = ctl_mask; 831590Srgrimes nready = select(32, &read_mask, 0, 0, &wait); 841590Srgrimes if (nready < 0) { 851590Srgrimes if (errno == EINTR) 861590Srgrimes continue; 871590Srgrimes p_error("Error waiting for daemon response"); 881590Srgrimes } 891590Srgrimes } while (nready == 0); 901590Srgrimes /* 918874Srgrimes * Keep reading while there are queued messages 921590Srgrimes * (this is not necessary, it just saves extra 931590Srgrimes * request/acknowledgements being sent) 941590Srgrimes */ 951590Srgrimes do { 961590Srgrimes cc = recv(ctl_sockt, (char *)rp, sizeof (*rp), 0); 971590Srgrimes if (cc < 0) { 981590Srgrimes if (errno == EINTR) 991590Srgrimes continue; 1001590Srgrimes p_error("Error on read from talk daemon"); 1011590Srgrimes } 1021590Srgrimes read_mask = ctl_mask; 1031590Srgrimes /* an immediate poll */ 1041590Srgrimes timerclear(&wait); 1051590Srgrimes nready = select(32, &read_mask, 0, 0, &wait); 1061590Srgrimes } while (nready > 0 && (rp->vers != TALK_VERSION || 1071590Srgrimes rp->type != type)); 1081590Srgrimes } while (rp->vers != TALK_VERSION || rp->type != type); 1091590Srgrimes rp->id_num = ntohl(rp->id_num); 1101590Srgrimes rp->addr.sa_family = ntohs(rp->addr.sa_family); 1111590Srgrimes} 112