fbbd9655e5
Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
122 lines
3.7 KiB
C
122 lines
3.7 KiB
C
/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#ifndef lint
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static const char sccsid[] = "@(#)look_up.c 8.1 (Berkeley) 6/6/93";
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#endif
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <protocols/talkd.h>
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#include "talk_ctl.h"
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#include "talk.h"
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/*
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* See if the local daemon has an invitation for us.
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*/
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int
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check_local(void)
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{
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CTL_RESPONSE response;
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CTL_RESPONSE *rp = &response;
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struct sockaddr addr;
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/* the rest of msg was set up in get_names */
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#ifdef MSG_EOR
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/* copy new style sockaddr to old, swap family (short in old) */
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msg.ctl_addr = *(struct osockaddr *)&ctl_addr;
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msg.ctl_addr.sa_family = htons(ctl_addr.sin_family);
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#else
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msg.ctl_addr = *(struct sockaddr *)&ctl_addr;
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#endif
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/* must be initiating a talk */
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if (!look_for_invite(rp))
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return (0);
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/*
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* There was an invitation waiting for us,
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* so connect with the other (hopefully waiting) party
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*/
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current_state = "Waiting to connect with caller";
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do {
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if (rp->addr.sa_family != AF_INET)
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p_error("Response uses invalid network address");
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(void)memcpy(&addr, &rp->addr.sa_family, sizeof(addr));
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addr.sa_family = rp->addr.sa_family;
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addr.sa_len = sizeof(addr);
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errno = 0;
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if (connect(sockt, &addr, sizeof(addr)) != -1)
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return (1);
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} while (errno == EINTR);
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if (errno == ECONNREFUSED) {
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/*
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* The caller gave up, but his invitation somehow
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* was not cleared. Clear it and initiate an
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* invitation. (We know there are no newer invitations,
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* the talkd works LIFO.)
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*/
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ctl_transact(his_machine_addr, msg, DELETE, rp);
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close(sockt);
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open_sockt();
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return (0);
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}
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p_error("Unable to connect with initiator");
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/*NOTREACHED*/
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return (0);
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}
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/*
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* Look for an invitation on 'machine'
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*/
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int
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look_for_invite(CTL_RESPONSE *rp)
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{
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current_state = "Checking for invitation on caller's machine";
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ctl_transact(his_machine_addr, msg, LOOK_UP, rp);
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/* the switch is for later options, such as multiple invitations */
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switch (rp->answer) {
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case SUCCESS:
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msg.id_num = htonl(rp->id_num);
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return (1);
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default:
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/* there wasn't an invitation waiting for us */
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return (0);
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}
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}
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