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 34 #ifndef lint 35 #if 0 36 static char sccsid[] = "@(#)ctl_transact.c 8.1 (Berkeley) 6/6/93"; 37 #endif 38 static const char rcsid[] = 39 "$FreeBSD$"; 40 #endif /* not lint */ 41 42 #include <errno.h> 43 #include <string.h> 44 #include "talk.h" 45 #include "talk_ctl.h" 46 47 #define CTL_WAIT 2 /* time to wait for a response, in seconds */ 48 49 /* 50 * SOCKDGRAM is unreliable, so we must repeat messages if we have 51 * not recieved an acknowledgement within a reasonable amount 52 * of time 53 */ 54 void 55 ctl_transact(target, msg, type, rp) 56 struct in_addr target; 57 CTL_MSG msg; 58 int type; 59 CTL_RESPONSE *rp; 60 { 61 fd_set read_mask, ctl_mask; 62 int nready = 0, cc; 63 struct timeval wait; 64 65 msg.type = type; 66 daemon_addr.sin_addr = target; 67 daemon_addr.sin_port = daemon_port; 68 FD_ZERO(&ctl_mask); 69 FD_SET(ctl_sockt, &ctl_mask); 70 71 /* 72 * Keep sending the message until a response of 73 * the proper type is obtained. 74 */ 75 do { 76 wait.tv_sec = CTL_WAIT; 77 wait.tv_usec = 0; 78 /* resend message until a response is obtained */ 79 do { 80 cc = sendto(ctl_sockt, (char *)&msg, sizeof (msg), 0, 81 (struct sockaddr *)&daemon_addr, 82 sizeof (daemon_addr)); 83 if (cc != sizeof (msg)) { 84 if (errno == EINTR) 85 continue; 86 p_error("Error on write to talk daemon"); 87 } 88 read_mask = ctl_mask; 89 nready = select(32, &read_mask, 0, 0, &wait); 90 if (nready < 0) { 91 if (errno == EINTR) 92 continue; 93 p_error("Error waiting for daemon response"); 94 } 95 } while (nready == 0); 96 /* 97 * Keep reading while there are queued messages 98 * (this is not necessary, it just saves extra 99 * request/acknowledgements being sent) 100 */ 101 do { 102 cc = recv(ctl_sockt, (char *)rp, sizeof (*rp), 0); 103 if (cc < 0) { 104 if (errno == EINTR) 105 continue; 106 p_error("Error on read from talk daemon"); 107 } 108 read_mask = ctl_mask; 109 /* an immediate poll */ 110 timerclear(&wait); 111 nready = select(32, &read_mask, 0, 0, &wait); 112 } while (nready > 0 && (rp->vers != TALK_VERSION || 113 rp->type != type)); 114 } while (rp->vers != TALK_VERSION || rp->type != type); 115 rp->id_num = ntohl(rp->id_num); 116 rp->addr.sa_family = ntohs(rp->addr.sa_family); 117 } 118