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/* $OpenBSD: look_up.c,v 1.13 2016/02/01 07:29:25 mestre Exp $ */ |
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/* $NetBSD: look_up.c,v 1.3 1994/12/09 02:14:21 jtc Exp $ */ |
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/* |
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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/socket.h> |
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#include <errno.h> |
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#include <unistd.h> |
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#include "talk.h" |
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#include "talk_ctl.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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/* 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(&response)) |
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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 (ntohs(response.addr.sa_family) != AF_INET) |
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quit("Response uses invalid network address", 1); |
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errno = 0; |
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if (connect(sockt, (struct sockaddr *)&response.addr, |
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sizeof (response.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, &response); |
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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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quit("Unable to connect with initiator", 1); |
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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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} |