/* $NetBSD: look_up.c,v 1.8 2012/03/20 20:34:59 matt Exp $ */
/*
* 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 <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)look_up.c 8.1 (Berkeley) 6/6/93";
#endif
__RCSID("$NetBSD: look_up.c,v 1.8 2012/03/20 20:34:59 matt Exp $");
#endif /* not lint */
#include "talk.h"
#include <errno.h>
#include <unistd.h>
#include "talk_ctl.h"
/*
* See if the local daemon has an invitation for us.
*/
int
check_local(void)
{
CTL_RESPONSE response;
CTL_RESPONSE *rp = &response;
struct sockaddr addr;
/* the rest of msg was set up in get_names */
#ifdef MSG_EOR
/* copy new style sockaddr to old, swap family (short in old) */
msg.ctl_addr = *(struct talkd_sockaddr *)(void *)&ctl_addr;
msg.ctl_addr.sa_family = htons(ctl_addr.sin_family);
#else
msg.ctl_addr = *(struct sockaddr *)&ctl_addr;
#endif
/* must be initiating a talk */
if (!look_for_invite(rp))
return (0);
/*
* There was an invitation waiting for us,
* so connect with the other (hopefully waiting) party
*/
current_state = "Waiting to connect with caller";
do {
if (rp->addr.sa_family != AF_INET)
p_error("Response uses invalid network address");
(void)memcpy(&addr, &rp->addr.sa_family, sizeof(addr));
addr.sa_family = rp->addr.sa_family;
addr.sa_len = sizeof(addr);
errno = 0;
if (connect(sockt, &addr, sizeof(addr)) != -1)
return (1);
} while (errno == EINTR);
if (errno == ECONNREFUSED) {
/*
* The caller gave up, but his invitation somehow
* was not cleared. Clear it and initiate an
* invitation. (We know there are no newer invitations,
* the talkd works LIFO.)
*/
ctl_transact(his_machine_addr, msg, DELETE, rp);
close(sockt);
open_sockt();
return (0);
}
p_error("Unable to connect with initiator");
/*NOTREACHED*/
return (0);
}
/*
* Look for an invitation on 'machine'
*/
int
look_for_invite(CTL_RESPONSE *rp)
{
current_state = "Checking for invitation on caller's machine";
ctl_transact(his_machine_addr, msg, LOOK_UP, rp);
/* the switch is for later options, such as multiple invitations */
switch (rp->answer) {
case SUCCESS:
msg.id_num = htonl(rp->id_num);
return (1);
default:
/* there wasn't an invitation waiting for us */
return (0);
}
}
