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/* $NetBSD: ctl_transact.c,v 1.10 2014/03/29 20:10:10 dholland Exp $ */
/*
* Copyright (c) 1983-2003, Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* + Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* + Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* + Neither the name of the University of California, San Francisco nor
* the names of its contributors may be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "bsd.h"
#if defined(TALK_43) || defined(TALK_42)
#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)ctl_transact.c 5.2 (Berkeley) 3/13/86";
#else
__RCSID("$NetBSD: ctl_transact.c,v 1.10 2014/03/29 20:10:10 dholland Exp $");
#endif
#endif /* not lint */
#include <sys/time.h>
#include <unistd.h>
#include "hunt.h"
#include "talk_ctl.h"
#define CTL_WAIT 2 /* time to wait for a response, in seconds */
#define MAX_RETRY 5
/*
* SOCKDGRAM is unreliable, so we must repeat messages if we have
* not received an acknowledgement within a reasonable amount
* of time
*/
void
ctl_transact(struct in_addr target, CTL_MSG tmsg, int type, CTL_RESPONSE *rp)
{
struct pollfd set[1];
int nready, cc, retries;
nready = 0;
tmsg.type = type;
daemon_addr.sin_family = AF_INET;
daemon_addr.sin_addr = target;
daemon_addr.sin_port = daemon_port;
set[0].fd = ctl_sockt;
set[0].events = POLLIN;
/*
* Keep sending the message until a response of
* the proper type is obtained.
*/
do {
/* resend message until a response is obtained */
for (retries = MAX_RETRY; retries > 0; retries -= 1) {
cc = sendto(ctl_sockt, &tmsg, sizeof (tmsg), 0,
(struct sockaddr *) &daemon_addr,
sizeof(daemon_addr));
if (cc != sizeof (tmsg)) {
if (errno == EINTR)
continue;
p_error("Error on write to talk daemon");
}
nready = poll(set, 1, CTL_WAIT * 1000);
if (nready < 0) {
if (errno == EINTR)
continue;
p_error("Error waiting for daemon response");
}
if (nready != 0)
break;
}
if (retries <= 0)
break;
/*
* Keep reading while there are queued messages
* (this is not necessary, it just saves extra
* request/acknowledgements being sent)
*/
do {
cc = recv(ctl_sockt, rp, sizeof (*rp), 0);
if (cc < 0) {
if (errno == EINTR)
continue;
p_error("Error on read from talk daemon");
}
/* an immediate poll */
nready = poll(set, 1, 0);
} while (nready > 0 && (
#ifdef TALK_43
rp->vers != TALK_VERSION ||
#endif
rp->type != type));
} while (
#ifdef TALK_43
rp->vers != TALK_VERSION ||
#endif
rp->type != type);
rp->id_num = ntohl(rp->id_num);
#ifdef TALK_43
rp->addr.sa_family = ntohs(rp->addr.sa_family);
#else
rp->addr.sin_family = ntohs(rp->addr.sin_family);
#endif
}
#endif
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