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/*
Copyright (C) 1995-2025 Free Software Foundation, Inc.
This file is part of GNU Inetutils.
GNU Inetutils is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at
your option) any later version.
GNU Inetutils is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see `http://www.gnu.org/licenses/'. */
/*
* Copyright (c) 1983, 1993
* The 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the name of the University 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 REGENTS 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 REGENTS 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 <config.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <time.h>
#include <netinet/in.h>
#include <sys/select.h>
#include <protocols/talkd.h>
#include <errno.h>
#include "talk_ctl.h"
#include "talk.h"
#define CTL_WAIT 2 /* time to wait for a response, in seconds */
/*
* SOCKDGRAM is unreliable, so we must repeat messages if we have
* not received an acknowledgement within a reasonable amount
* of time
*/
int
ctl_transact (struct in_addr target, CTL_MSG msg, int type, CTL_RESPONSE *rp)
{
int nready = 0, cc;
fd_set read_mask, ctl_mask;
struct timeval wait;
msg.type = type;
daemon_addr.sin_family = AF_INET;
#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
daemon_addr.sin_len = sizeof (daemon_addr);
#endif
daemon_addr.sin_addr = target;
daemon_addr.sin_port = htons (daemon_port);
FD_ZERO (&ctl_mask);
FD_SET (ctl_sockt, &ctl_mask);
/*
* Keep sending the message until a response of
* the proper type is obtained.
*/
do
{
wait.tv_sec = CTL_WAIT;
wait.tv_usec = 0;
/* resend message until a response is obtained */
do
{
cc = sendto (ctl_sockt, (char *) &msg, sizeof (msg), 0,
(struct sockaddr *) &daemon_addr,
sizeof (daemon_addr));
if (cc != sizeof (msg))
{
if (errno == EINTR)
continue;
p_error ("Error on write to talk daemon");
}
read_mask = ctl_mask;
nready = select (32, &read_mask, 0, 0, &wait);
if (nready < 0)
{
if (errno == EINTR)
continue;
p_error ("Error waiting for daemon response");
}
}
while (nready == 0);
/*
* Keep reading while there are queued messages
* (this is not necessary, it just saves extra
* request/acknowledgements being sent)
*/
do
{
cc = recv (ctl_sockt, (char *) rp, sizeof (*rp), 0);
if (cc < 0)
{
if (errno == EINTR)
continue;
p_error ("Error on read from talk daemon");
}
read_mask = ctl_mask;
/* an immediate poll */
timerclear (&wait);
nready = select (32, &read_mask, 0, 0, &wait);
}
while (nready > 0 && (rp->vers != TALK_VERSION || rp->type != type));
}
while (rp->vers != TALK_VERSION || rp->type != type);
rp->id_num = ntohl (rp->id_num);
rp->addr.sa_family = ntohs (rp->addr.sa_family);
return 0;
}
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