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Annotation of src/usr.bin/talk/look_up.c, Revision 1.8

1.8     ! millert     1: /*     $OpenBSD: look_up.c,v 1.7 2001/07/17 02:23:58 pvalchev Exp $    */
1.1       deraadt     2: /*     $NetBSD: look_up.c,v 1.3 1994/12/09 02:14:21 jtc Exp $  */
                      3:
                      4: /*
                      5:  * Copyright (c) 1983, 1993
                      6:  *     The Regents of the University of California.  All rights reserved.
                      7:  *
                      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
1.8     ! millert    16:  * 3. Neither the name of the University nor the names of its contributors
1.1       deraadt    17:  *    may be used to endorse or promote products derived from this software
                     18:  *    without specific prior written permission.
                     19:  *
                     20:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     30:  * SUCH DAMAGE.
                     31:  */
                     32:
                     33: #ifndef lint
                     34: #if 0
                     35: static char sccsid[] = "@(#)look_up.c  8.1 (Berkeley) 6/6/93";
                     36: #endif
1.8     ! millert    37: static char rcsid[] = "$OpenBSD: look_up.c,v 1.7 2001/07/17 02:23:58 pvalchev Exp $";
1.1       deraadt    38: #endif /* not lint */
                     39:
1.4       pjanzen    40: #include "talk.h"
1.1       deraadt    41: #include <errno.h>
1.4       pjanzen    42: #include <unistd.h>
1.1       deraadt    43: #include "talk_ctl.h"
                     44:
                     45: /*
                     46:  * See if the local daemon has an invitation for us.
                     47:  */
1.4       pjanzen    48: int
1.1       deraadt    49: check_local()
                     50: {
                     51:        CTL_RESPONSE response;
                     52:
                     53:        /* the rest of msg was set up in get_names */
                     54: #ifdef MSG_EOR
                     55:        /* copy new style sockaddr to old, swap family (short in old) */
                     56:        msg.ctl_addr = *(struct osockaddr *)&ctl_addr;
                     57:        msg.ctl_addr.sa_family = htons(ctl_addr.sin_family);
                     58: #else
                     59:        msg.ctl_addr = *(struct sockaddr *)&ctl_addr;
                     60: #endif
                     61:        /* must be initiating a talk */
1.2       mickey     62:        if (!look_for_invite(&response))
1.1       deraadt    63:                return (0);
                     64:        /*
1.5       millert    65:         * There was an invitation waiting for us,
                     66:         * so connect with the other (hopefully waiting) party
1.1       deraadt    67:         */
                     68:        current_state = "Waiting to connect with caller";
                     69:        do {
1.2       mickey     70:                if (ntohs(response.addr.sa_family) != AF_INET)
1.6       millert    71:                        quit("Response uses invalid network address", 1);
1.1       deraadt    72:                errno = 0;
1.2       mickey     73:                if (connect(sockt, (struct sockaddr *)&response.addr,
                     74:                            sizeof (response.addr)) != -1)
1.1       deraadt    75:                        return (1);
                     76:        } while (errno == EINTR);
                     77:        if (errno == ECONNREFUSED) {
                     78:                /*
                     79:                 * The caller gave up, but his invitation somehow
1.5       millert    80:                 * was not cleared. Clear it and initiate an
1.1       deraadt    81:                 * invitation. (We know there are no newer invitations,
                     82:                 * the talkd works LIFO.)
                     83:                 */
1.2       mickey     84:                ctl_transact(his_machine_addr, msg, DELETE, &response);
1.1       deraadt    85:                close(sockt);
                     86:                open_sockt();
                     87:                return (0);
                     88:        }
1.6       millert    89:        quit("Unable to connect with initiator", 1);
1.1       deraadt    90:        /*NOTREACHED*/
1.7       pvalchev   91:        return (0);
1.1       deraadt    92: }
                     93:
                     94: /*
                     95:  * Look for an invitation on 'machine'
                     96:  */
1.4       pjanzen    97: int
1.1       deraadt    98: look_for_invite(rp)
                     99:        CTL_RESPONSE *rp;
                    100: {
                    101:        current_state = "Checking for invitation on caller's machine";
                    102:        ctl_transact(his_machine_addr, msg, LOOK_UP, rp);
                    103:        /* the switch is for later options, such as multiple invitations */
                    104:        switch (rp->answer) {
                    105:
                    106:        case SUCCESS:
                    107:                msg.id_num = htonl(rp->id_num);
                    108:                return (1);
                    109:
                    110:        default:
                    111:                /* there wasn't an invitation waiting for us */
                    112:                return (0);
                    113:        }
                    114: }