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 */ 36 37 #include <errno.h> 38 #include <string.h> 39 #include "talk.h" 40 #include "talk_ctl.h" 41 42 #define CTL_WAIT 2 /* time to wait for a response, in seconds */ 43 44 /* 45 * SOCKDGRAM is unreliable, so we must repeat messages if we have 46 * not recieved an acknowledgement within a reasonable amount 47 * of time 48 */ 49 void 50 ctl_transact(struct in_addr target, CTL_MSG lmsg, int type, CTL_RESPONSE *rp) 51 { 52 fd_set read_mask, ctl_mask; 53 int nready = 0, cc; 54 struct timeval wait; 55 56 lmsg.type = type; 57 daemon_addr.sin_addr = target; 58 daemon_addr.sin_port = daemon_port; 59 FD_ZERO(&ctl_mask); 60 FD_SET(ctl_sockt, &ctl_mask); 61 62 /* 63 * Keep sending the message until a response of 64 * the proper type is obtained. 65 */ 66 do { 67 wait.tv_sec = CTL_WAIT; 68 wait.tv_usec = 0; 69 /* resend message until a response is obtained */ 70 do { 71 cc = sendto(ctl_sockt, (char *)&lmsg, sizeof (lmsg), 0, 72 (struct sockaddr *)&daemon_addr, 73 sizeof (daemon_addr)); 74 if (cc != sizeof (lmsg)) { 75 if (errno == EINTR) 76 continue; 77 p_error("Error on write to talk daemon"); 78 } 79 read_mask = ctl_mask; 80 nready = select(32, &read_mask, 0, 0, &wait); 81 if (nready < 0) { 82 if (errno == EINTR) 83 continue; 84 p_error("Error waiting for daemon response"); 85 } 86 } while (nready == 0); 87 /* 88 * Keep reading while there are queued messages 89 * (this is not necessary, it just saves extra 90 * request/acknowledgements being sent) 91 */ 92 do { 93 cc = recv(ctl_sockt, (char *)rp, sizeof (*rp), 0); 94 if (cc < 0) { 95 if (errno == EINTR) 96 continue; 97 p_error("Error on read from talk daemon"); 98 } 99 read_mask = ctl_mask; 100 /* an immediate poll */ 101 timerclear(&wait); 102 nready = select(32, &read_mask, 0, 0, &wait); 103 } while (nready > 0 && (rp->vers != TALK_VERSION || 104 rp->type != type)); 105 } while (rp->vers != TALK_VERSION || rp->type != type); 106 rp->id_num = ntohl(rp->id_num); 107 rp->addr.sa_family = ntohs(rp->addr.sa_family); 108 } 109