120 lines
3.7 KiB
C
120 lines
3.7 KiB
C
/* $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);
|
|
}
|
|
}
|