/* $NetBSD: look_up.c,v 1.3 1994/12/09 02:14:21 jtc 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. 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. */ #ifndef lint #if 0 static char sccsid[] = "@(#)look_up.c 8.1 (Berkeley) 6/6/93"; #endif static char rcsid[] = "$NetBSD: look_up.c,v 1.3 1994/12/09 02:14:21 jtc Exp $"; #endif /* not lint */ #include #include #include #include #include #include "talk_ctl.h" #include "talk.h" /* * See if the local daemon has an invitation for us. */ check_local() { CTL_RESPONSE response; /* 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 osockaddr *)&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(&response)) 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 (ntohs(response.addr.sa_family) != AF_INET) p_error("Response uses invalid network address"); errno = 0; if (connect(sockt, (struct sockaddr *)&response.addr, sizeof (response.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, &response); close(sockt); open_sockt(); return (0); } p_error("Unable to connect with initiator"); /*NOTREACHED*/ } /* * Look for an invitation on 'machine' */ look_for_invite(rp) CTL_RESPONSE *rp; { struct in_addr machine_addr; 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); } }