1 /* 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)ctl_transact.c 8.1 (Berkeley) 6/6/93 34 * $FreeBSD: src/usr.bin/talk/ctl_transact.c,v 1.5 1999/08/28 01:06:11 peter Exp $ 35 * $DragonFly: src/usr.bin/talk/ctl_transact.c,v 1.3 2003/10/04 20:36:52 hmp Exp $ 36 */ 37 38 #include <errno.h> 39 #include <string.h> 40 #include "talk.h" 41 #include "talk_ctl.h" 42 43 #define CTL_WAIT 2 /* time to wait for a response, in seconds */ 44 45 /* 46 * SOCKDGRAM is unreliable, so we must repeat messages if we have 47 * not recieved an acknowledgement within a reasonable amount 48 * of time 49 */ 50 void 51 ctl_transact(struct in_addr target, CTL_MSG msg, int type, CTL_RESPONSE *rp) 52 { 53 fd_set read_mask, ctl_mask; 54 int nready = 0, cc; 55 struct timeval wait; 56 57 msg.type = type; 58 daemon_addr.sin_addr = target; 59 daemon_addr.sin_port = daemon_port; 60 FD_ZERO(&ctl_mask); 61 FD_SET(ctl_sockt, &ctl_mask); 62 63 /* 64 * Keep sending the message until a response of 65 * the proper type is obtained. 66 */ 67 do { 68 wait.tv_sec = CTL_WAIT; 69 wait.tv_usec = 0; 70 /* resend message until a response is obtained */ 71 do { 72 cc = sendto(ctl_sockt, (char *)&msg, sizeof (msg), 0, 73 (struct sockaddr *)&daemon_addr, 74 sizeof (daemon_addr)); 75 if (cc != sizeof (msg)) { 76 if (errno == EINTR) 77 continue; 78 p_error("Error on write to talk daemon"); 79 } 80 read_mask = ctl_mask; 81 nready = select(32, &read_mask, 0, 0, &wait); 82 if (nready < 0) { 83 if (errno == EINTR) 84 continue; 85 p_error("Error waiting for daemon response"); 86 } 87 } while (nready == 0); 88 /* 89 * Keep reading while there are queued messages 90 * (this is not necessary, it just saves extra 91 * request/acknowledgements being sent) 92 */ 93 do { 94 cc = recv(ctl_sockt, (char *)rp, sizeof (*rp), 0); 95 if (cc < 0) { 96 if (errno == EINTR) 97 continue; 98 p_error("Error on read from talk daemon"); 99 } 100 read_mask = ctl_mask; 101 /* an immediate poll */ 102 timerclear(&wait); 103 nready = select(32, &read_mask, 0, 0, &wait); 104 } while (nready > 0 && (rp->vers != TALK_VERSION || 105 rp->type != type)); 106 } while (rp->vers != TALK_VERSION || rp->type != type); 107 rp->id_num = ntohl(rp->id_num); 108 rp->addr.sa_family = ntohs(rp->addr.sa_family); 109 } 110