129 lines
3.9 KiB
C
129 lines
3.9 KiB
C
/* $NetBSD: ctl_transact.c,v 1.9 2009/07/04 04:29:54 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 1.9 2009/07/04 04:29:54 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 msg, int type, CTL_RESPONSE *rp)
|
|
{
|
|
struct pollfd set[1];
|
|
int nready, cc, retries;
|
|
|
|
nready = 0;
|
|
msg.type = type;
|
|
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, &msg, sizeof (msg), 0,
|
|
&daemon_addr, sizeof (daemon_addr));
|
|
if (cc != sizeof (msg)) {
|
|
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
|