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