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Annotation of src/usr.bin/talk/look_up.c, Revision 1.3

1.3     ! deraadt     1: /*     $OpenBSD: look_up.c,v 1.3 1994/12/09 02:14:21 jtc 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.
                     16:  * 3. All advertising materials mentioning features or use of this software
                     17:  *    must display the following acknowledgement:
                     18:  *     This product includes software developed by the University of
                     19:  *     California, Berkeley and its contributors.
                     20:  * 4. Neither the name of the University nor the names of its contributors
                     21:  *    may be used to endorse or promote products derived from this software
                     22:  *    without specific prior written permission.
                     23:  *
                     24:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     25:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     26:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     27:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     28:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     29:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     30:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     31:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     32:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     33:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     34:  * SUCH DAMAGE.
                     35:  */
                     36:
                     37: #ifndef lint
                     38: #if 0
                     39: static char sccsid[] = "@(#)look_up.c  8.1 (Berkeley) 6/6/93";
                     40: #endif
1.3     ! deraadt    41: static char rcsid[] = "$OpenBSD: look_up.c,v 1.3 1994/12/09 02:14:21 jtc Exp $";
1.1       deraadt    42: #endif /* not lint */
                     43:
                     44: #include <sys/types.h>
                     45: #include <sys/socket.h>
                     46: #include <netinet/in.h>
                     47: #include <protocols/talkd.h>
                     48: #include <errno.h>
                     49: #include "talk_ctl.h"
                     50: #include "talk.h"
                     51:
                     52: /*
                     53:  * See if the local daemon has an invitation for us.
                     54:  */
                     55: check_local()
                     56: {
                     57:        CTL_RESPONSE response;
                     58:
                     59:        /* the rest of msg was set up in get_names */
                     60: #ifdef MSG_EOR
                     61:        /* copy new style sockaddr to old, swap family (short in old) */
                     62:        msg.ctl_addr = *(struct osockaddr *)&ctl_addr;
                     63:        msg.ctl_addr.sa_family = htons(ctl_addr.sin_family);
                     64: #else
                     65:        msg.ctl_addr = *(struct sockaddr *)&ctl_addr;
                     66: #endif
                     67:        /* must be initiating a talk */
1.2       mickey     68:        if (!look_for_invite(&response))
1.1       deraadt    69:                return (0);
                     70:        /*
                     71:         * There was an invitation waiting for us,
                     72:         * so connect with the other (hopefully waiting) party
                     73:         */
                     74:        current_state = "Waiting to connect with caller";
                     75:        do {
1.2       mickey     76:                if (ntohs(response.addr.sa_family) != AF_INET)
1.1       deraadt    77:                        p_error("Response uses invalid network address");
                     78:                errno = 0;
1.2       mickey     79:                if (connect(sockt, (struct sockaddr *)&response.addr,
                     80:                            sizeof (response.addr)) != -1)
1.1       deraadt    81:                        return (1);
                     82:        } while (errno == EINTR);
                     83:        if (errno == ECONNREFUSED) {
                     84:                /*
                     85:                 * The caller gave up, but his invitation somehow
                     86:                 * was not cleared. Clear it and initiate an
                     87:                 * invitation. (We know there are no newer invitations,
                     88:                 * the talkd works LIFO.)
                     89:                 */
1.2       mickey     90:                ctl_transact(his_machine_addr, msg, DELETE, &response);
1.1       deraadt    91:                close(sockt);
                     92:                open_sockt();
                     93:                return (0);
                     94:        }
                     95:        p_error("Unable to connect with initiator");
                     96:        /*NOTREACHED*/
                     97: }
                     98:
                     99: /*
                    100:  * Look for an invitation on 'machine'
                    101:  */
                    102: look_for_invite(rp)
                    103:        CTL_RESPONSE *rp;
                    104: {
                    105:        struct in_addr machine_addr;
                    106:
                    107:        current_state = "Checking for invitation on caller's machine";
                    108:        ctl_transact(his_machine_addr, msg, LOOK_UP, rp);
                    109:        /* the switch is for later options, such as multiple invitations */
                    110:        switch (rp->answer) {
                    111:
                    112:        case SUCCESS:
                    113:                msg.id_num = htonl(rp->id_num);
                    114:                return (1);
                    115:
                    116:        default:
                    117:                /* there wasn't an invitation waiting for us */
                    118:                return (0);
                    119:        }
                    120: }