1 /* $OpenBSD: ctl_transact.c,v 1.3 1996/06/26 05:40:20 deraadt 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. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "@(#)ctl_transact.c 8.1 (Berkeley) 6/6/93"; 40 #endif 41 static char rcsid[] = "$OpenBSD: ctl_transact.c,v 1.3 1996/06/26 05:40:20 deraadt Exp $"; 42 #endif /* not lint */ 43 44 #include <sys/types.h> 45 #include <sys/socket.h> 46 #include <sys/time.h> 47 #include <netinet/in.h> 48 #include <protocols/talkd.h> 49 #include <errno.h> 50 #include "talk_ctl.h" 51 52 #define CTL_WAIT 2 /* time to wait for a response, in seconds */ 53 54 /* 55 * SOCKDGRAM is unreliable, so we must repeat messages if we have 56 * not recieved an acknowledgement within a reasonable amount 57 * of time 58 */ 59 ctl_transact(target, msg, type, rp) 60 struct in_addr target; 61 CTL_MSG msg; 62 int type; 63 CTL_RESPONSE *rp; 64 { 65 int read_mask, ctl_mask, nready, cc; 66 struct timeval wait; 67 68 msg.type = type; 69 daemon_addr.sin_addr = target; 70 daemon_addr.sin_port = daemon_port; 71 ctl_mask = 1 << ctl_sockt; 72 73 /* 74 * Keep sending the message until a response of 75 * the proper type is obtained. 76 */ 77 do { 78 wait.tv_sec = CTL_WAIT; 79 wait.tv_usec = 0; 80 /* resend message until a response is obtained */ 81 do { 82 cc = sendto(ctl_sockt, (char *)&msg, sizeof (msg), 0, 83 (struct sockaddr *)&daemon_addr, 84 sizeof (daemon_addr)); 85 if (cc != sizeof (msg)) { 86 if (errno == EINTR) 87 continue; 88 p_error("Error on write to talk daemon"); 89 } 90 read_mask = ctl_mask; 91 nready = select(32, &read_mask, 0, 0, &wait); 92 if (nready < 0) { 93 if (errno == EINTR) 94 continue; 95 p_error("Error waiting for daemon response"); 96 } 97 } while (nready == 0); 98 /* 99 * Keep reading while there are queued messages 100 * (this is not necessary, it just saves extra 101 * request/acknowledgements being sent) 102 */ 103 do { 104 cc = recv(ctl_sockt, (char *)rp, sizeof (*rp), 0); 105 if (cc < 0) { 106 if (errno == EINTR) 107 continue; 108 p_error("Error on read from talk daemon"); 109 } 110 read_mask = ctl_mask; 111 /* an immediate poll */ 112 timerclear(&wait); 113 nready = select(32, &read_mask, 0, 0, &wait); 114 } while (nready > 0 && (rp->vers != TALK_VERSION || 115 rp->type != type)); 116 } while (rp->vers != TALK_VERSION || rp->type != type); 117 rp->id_num = ntohl(rp->id_num); 118 } 119