1 /* $OpenBSD: ctl_transact.c,v 1.10 2004/03/02 21:04:42 tedu Exp $ */
2 /* $NetBSD: ctl_transact.c,v 1.3 1994/12/09 02:14:12 jtc Exp $ */
3
4 /*
5 * Copyright (c) 1983, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #ifndef lint
34 #if 0
35 static char sccsid[] = "@(#)ctl_transact.c 8.1 (Berkeley) 6/6/93";
36 #endif
37 static const char rcsid[] = "$OpenBSD: ctl_transact.c,v 1.10 2004/03/02 21:04:42 tedu Exp $";
38 #endif /* not lint */
39
40 #include "talk.h"
41 #include <sys/time.h>
42 #include <errno.h>
43 #include <unistd.h>
44 #include <poll.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 received an acknowledgement within a reasonable amount
52 * of time
53 */
54 void
ctl_transact(target,msg,type,rp)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 struct pollfd pfd[1];
62 int nready, cc;
63
64 msg.type = type;
65 daemon_addr.sin_addr = target;
66 daemon_addr.sin_port = daemon_port;
67 pfd[0].fd = ctl_sockt;
68 pfd[0].events = POLLIN;
69
70 /*
71 * Keep sending the message until a response of
72 * the proper type is obtained.
73 */
74 do {
75 /* resend message until a response is obtained */
76 do {
77 cc = sendto(ctl_sockt, (char *)&msg, sizeof (msg), 0,
78 (struct sockaddr *)&daemon_addr,
79 sizeof (daemon_addr));
80 if (cc != sizeof (msg)) {
81 if (errno == EINTR)
82 continue;
83 quit("Error on write to talk daemon", 1);
84 }
85 nready = poll(pfd, 1, CTL_WAIT * 1000);
86 if (nready < 0) {
87 if (errno == EINTR)
88 continue;
89 quit("Error waiting for daemon response", 1);
90 }
91 } while (nready == 0);
92 /*
93 * Keep reading while there are queued messages
94 * (this is not necessary, it just saves extra
95 * request/acknowledgements being sent)
96 */
97 do {
98 cc = recv(ctl_sockt, (char *)rp, sizeof (*rp), 0);
99 if (cc < 0) {
100 if (errno == EINTR)
101 continue;
102 quit("Error on read from talk daemon", 1);
103 }
104 nready = poll(pfd, 1, 0);
105 } while (nready > 0 && (rp->vers != TALK_VERSION ||
106 rp->type != type));
107 } while (rp->vers != TALK_VERSION || rp->type != type);
108 rp->id_num = ntohl(rp->id_num);
109 }
110