1 /* $OpenBSD: ctl_transact.c,v 1.8 2003/06/03 02:56:17 millert Exp $ */ 2 /* $NetBSD: ctl_transact.c,v 1.3 1994/12/09 02:14:12 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 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)ctl_transact.c 8.1 (Berkeley) 6/6/93"; 36 #endif 37 static char rcsid[] = "$OpenBSD: ctl_transact.c,v 1.8 2003/06/03 02:56:17 millert Exp $"; 38 #endif /* not lint */ 39 40 #include "talk.h" 41 #include <sys/time.h> 42 #include <errno.h> 43 #include <unistd.h> 44 #include "talk_ctl.h" 45 46 #define CTL_WAIT 2 /* time to wait for a response, in seconds */ 47 48 /* 49 * SOCKDGRAM is unreliable, so we must repeat messages if we have 50 * not received an acknowledgement within a reasonable amount 51 * of time 52 */ 53 void 54 ctl_transact(target, msg, type, rp) 55 struct in_addr target; 56 CTL_MSG msg; 57 int type; 58 CTL_RESPONSE *rp; 59 { 60 fd_set read_mask, ctl_mask; 61 int nready, cc; 62 struct timeval wait; 63 64 msg.type = type; 65 daemon_addr.sin_addr = target; 66 daemon_addr.sin_port = daemon_port; 67 FD_ZERO(&ctl_mask); 68 FD_SET(ctl_sockt, &ctl_mask); 69 70 /* 71 * Keep sending the message until a response of 72 * the proper type is obtained. 73 */ 74 do { 75 wait.tv_sec = CTL_WAIT; 76 wait.tv_usec = 0; 77 /* resend message until a response is obtained */ 78 do { 79 cc = sendto(ctl_sockt, (char *)&msg, sizeof (msg), 0, 80 (struct sockaddr *)&daemon_addr, 81 sizeof (daemon_addr)); 82 if (cc != sizeof (msg)) { 83 if (errno == EINTR) 84 continue; 85 quit("Error on write to talk daemon", 1); 86 } 87 read_mask = ctl_mask; 88 nready = select(ctl_sockt + 1, &read_mask, 0, 0, &wait); 89 if (nready < 0) { 90 if (errno == EINTR) 91 continue; 92 quit("Error waiting for daemon response", 1); 93 } 94 } while (nready == 0); 95 /* 96 * Keep reading while there are queued messages 97 * (this is not necessary, it just saves extra 98 * request/acknowledgements being sent) 99 */ 100 do { 101 cc = recv(ctl_sockt, (char *)rp, sizeof (*rp), 0); 102 if (cc < 0) { 103 if (errno == EINTR) 104 continue; 105 quit("Error on read from talk daemon", 1); 106 } 107 read_mask = ctl_mask; 108 /* an immediate poll */ 109 timerclear(&wait); 110 nready = select(ctl_sockt + 1, &read_mask, 0, 0, &wait); 111 } while (nready > 0 && (rp->vers != TALK_VERSION || 112 rp->type != type)); 113 } while (rp->vers != TALK_VERSION || rp->type != type); 114 rp->id_num = ntohl(rp->id_num); 115 } 116