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 * 4. 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 30 #include <sys/cdefs.h> 31 32 __FBSDID("$FreeBSD$"); 33 34 #ifndef lint 35 static const char sccsid[] = "@(#)ctl_transact.c 8.1 (Berkeley) 6/6/93"; 36 #endif 37 38 #include <arpa/inet.h> 39 40 #include <errno.h> 41 42 #include "talk.h" 43 #include "talk_ctl.h" 44 45 #define CTL_WAIT 2 /* time to wait for a response, in seconds */ 46 47 /* 48 * SOCKDGRAM is unreliable, so we must repeat messages if we have 49 * not received an acknowledgement within a reasonable amount 50 * of time 51 */ 52 void 53 ctl_transact(struct in_addr target, CTL_MSG lmsg, int type, CTL_RESPONSE *rp) 54 { 55 fd_set read_mask, ctl_mask; 56 int nready = 0, cc; 57 struct timeval wait; 58 59 lmsg.type = type; 60 daemon_addr.sin_addr = target; 61 daemon_addr.sin_port = daemon_port; 62 FD_ZERO(&ctl_mask); 63 FD_SET(ctl_sockt, &ctl_mask); 64 65 /* 66 * Keep sending the message until a response of 67 * the proper type is obtained. 68 */ 69 do { 70 wait.tv_sec = CTL_WAIT; 71 wait.tv_usec = 0; 72 /* resend message until a response is obtained */ 73 do { 74 cc = sendto(ctl_sockt, (char *)&lmsg, sizeof (lmsg), 0, 75 (struct sockaddr *)&daemon_addr, 76 sizeof (daemon_addr)); 77 if (cc != sizeof (lmsg)) { 78 if (errno == EINTR) 79 continue; 80 p_error("Error on write to talk daemon"); 81 } 82 read_mask = ctl_mask; 83 nready = select(32, &read_mask, 0, 0, &wait); 84 if (nready < 0) { 85 if (errno == EINTR) 86 continue; 87 p_error("Error waiting for daemon response"); 88 } 89 } while (nready == 0); 90 /* 91 * Keep reading while there are queued messages 92 * (this is not necessary, it just saves extra 93 * request/acknowledgements being sent) 94 */ 95 do { 96 cc = recv(ctl_sockt, (char *)rp, sizeof (*rp), 0); 97 if (cc < 0) { 98 if (errno == EINTR) 99 continue; 100 p_error("Error on read from talk daemon"); 101 } 102 read_mask = ctl_mask; 103 /* an immediate poll */ 104 timerclear(&wait); 105 nready = select(32, &read_mask, 0, 0, &wait); 106 } while (nready > 0 && (rp->vers != TALK_VERSION || 107 rp->type != type)); 108 } while (rp->vers != TALK_VERSION || rp->type != type); 109 rp->id_num = ntohl(rp->id_num); 110 rp->addr.sa_family = ntohs(rp->addr.sa_family); 111 } 112