1/*	$NetBSD: ctl_transact.c,v 1.8 2009/07/04 02:37:20 dholland Exp $	*/
2/*
3 * Copyright (c) 1983-2003, Regents of the University of California.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are
8 * met:
9 *
10 * + Redistributions of source code must retain the above copyright
11 *   notice, this list of conditions and the following disclaimer.
12 * + Redistributions in binary form must reproduce the above copyright
13 *   notice, this list of conditions and the following disclaimer in the
14 *   documentation and/or other materials provided with the distribution.
15 * + Neither the name of the University of California, San Francisco nor
16 *   the names of its contributors may be used to endorse or promote
17 *   products derived from this software without specific prior written
18 *   permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
21 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
23 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
24 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
25 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
26 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
30 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33#include "bsd.h"
34
35#if defined(TALK_43) || defined(TALK_42)
36
37#include <sys/cdefs.h>
38#ifndef lint
39#if 0
40static char sccsid[] = "@(#)ctl_transact.c	5.2 (Berkeley) 3/13/86";
41#else
42__RCSID("$NetBSD: ctl_transact.c,v 1.8 2009/07/04 02:37:20 dholland Exp $");
43#endif
44#endif /* not lint */
45
46#include <sys/time.h>
47#include <unistd.h>
48#include "hunt.h"
49#include "talk_ctl.h"
50
51#define CTL_WAIT 2	/* time to wait for a response, in seconds */
52#define MAX_RETRY 5
53
54/*
55 * SOCKDGRAM is unreliable, so we must repeat messages if we have
56 * not received an acknowledgement within a reasonable amount
57 * of time
58 */
59void
60ctl_transact(struct in_addr target, CTL_MSG msg, int type, CTL_RESPONSE *rp)
61{
62	struct pollfd set[1];
63	int nready, cc, retries;
64
65	nready = 0;
66	msg.type = type;
67	daemon_addr.sin_addr = target;
68	daemon_addr.sin_port = daemon_port;
69	set[0].fd = ctl_sockt;
70	set[0].events = POLLIN;
71
72	/*
73	 * Keep sending the message until a response of
74	 * the proper type is obtained.
75	 */
76	do {
77		/* resend message until a response is obtained */
78		for (retries = MAX_RETRY; retries > 0; retries -= 1) {
79			cc = sendto(ctl_sockt, &msg, sizeof (msg), 0,
80				&daemon_addr, sizeof (daemon_addr));
81			if (cc != sizeof (msg)) {
82				if (errno == EINTR)
83					continue;
84				p_error("Error on write to talk daemon");
85			}
86			nready = poll(set, 1, CTL_WAIT * 1000);
87			if (nready < 0) {
88				if (errno == EINTR)
89					continue;
90				p_error("Error waiting for daemon response");
91			}
92			if (nready != 0)
93				break;
94		}
95		if (retries <= 0)
96			break;
97		/*
98		 * Keep reading while there are queued messages
99		 * (this is not necessary, it just saves extra
100		 * request/acknowledgements being sent)
101		 */
102		do {
103			cc = recv(ctl_sockt, rp, sizeof (*rp), 0);
104			if (cc < 0) {
105				if (errno == EINTR)
106					continue;
107				p_error("Error on read from talk daemon");
108			}
109			/* an immediate poll */
110			nready = poll(set, 1, 0);
111		} while (nready > 0 && (
112#ifdef TALK_43
113		    rp->vers != TALK_VERSION ||
114#endif
115		    rp->type != type));
116	} while (
117#ifdef TALK_43
118	    rp->vers != TALK_VERSION ||
119#endif
120	    rp->type != type);
121	rp->id_num = ntohl(rp->id_num);
122#ifdef TALK_43
123	rp->addr.sa_family = ntohs(rp->addr.sa_family);
124#else
125	rp->addr.sin_family = ntohs(rp->addr.sin_family);
126#endif
127}
128#endif
129