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Annotation of src/usr.bin/talk/look_up.c, Revision 1.11

1.11    ! deraadt     1: /*     $OpenBSD: look_up.c,v 1.10 2004/03/02 21:04:42 tedu 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:
1.4       pjanzen    33: #include "talk.h"
1.1       deraadt    34: #include <errno.h>
1.4       pjanzen    35: #include <unistd.h>
1.1       deraadt    36: #include "talk_ctl.h"
                     37:
                     38: /*
                     39:  * See if the local daemon has an invitation for us.
                     40:  */
1.4       pjanzen    41: int
1.9       deraadt    42: check_local(void)
1.1       deraadt    43: {
                     44:        CTL_RESPONSE response;
                     45:
                     46:        /* the rest of msg was set up in get_names */
                     47: #ifdef MSG_EOR
                     48:        /* copy new style sockaddr to old, swap family (short in old) */
                     49:        msg.ctl_addr = *(struct osockaddr *)&ctl_addr;
                     50:        msg.ctl_addr.sa_family = htons(ctl_addr.sin_family);
                     51: #else
                     52:        msg.ctl_addr = *(struct sockaddr *)&ctl_addr;
                     53: #endif
                     54:        /* must be initiating a talk */
1.2       mickey     55:        if (!look_for_invite(&response))
1.1       deraadt    56:                return (0);
                     57:        /*
1.5       millert    58:         * There was an invitation waiting for us,
                     59:         * so connect with the other (hopefully waiting) party
1.1       deraadt    60:         */
                     61:        current_state = "Waiting to connect with caller";
                     62:        do {
1.2       mickey     63:                if (ntohs(response.addr.sa_family) != AF_INET)
1.6       millert    64:                        quit("Response uses invalid network address", 1);
1.1       deraadt    65:                errno = 0;
1.2       mickey     66:                if (connect(sockt, (struct sockaddr *)&response.addr,
                     67:                            sizeof (response.addr)) != -1)
1.1       deraadt    68:                        return (1);
                     69:        } while (errno == EINTR);
                     70:        if (errno == ECONNREFUSED) {
                     71:                /*
                     72:                 * The caller gave up, but his invitation somehow
1.5       millert    73:                 * was not cleared. Clear it and initiate an
1.1       deraadt    74:                 * invitation. (We know there are no newer invitations,
                     75:                 * the talkd works LIFO.)
                     76:                 */
1.2       mickey     77:                ctl_transact(his_machine_addr, msg, DELETE, &response);
1.1       deraadt    78:                close(sockt);
                     79:                open_sockt();
                     80:                return (0);
                     81:        }
1.6       millert    82:        quit("Unable to connect with initiator", 1);
1.1       deraadt    83:        /*NOTREACHED*/
1.7       pvalchev   84:        return (0);
1.1       deraadt    85: }
                     86:
                     87: /*
                     88:  * Look for an invitation on 'machine'
                     89:  */
1.4       pjanzen    90: int
1.9       deraadt    91: look_for_invite(CTL_RESPONSE *rp)
1.1       deraadt    92: {
                     93:        current_state = "Checking for invitation on caller's machine";
                     94:        ctl_transact(his_machine_addr, msg, LOOK_UP, rp);
                     95:        /* the switch is for later options, such as multiple invitations */
                     96:        switch (rp->answer) {
                     97:
                     98:        case SUCCESS:
                     99:                msg.id_num = htonl(rp->id_num);
                    100:                return (1);
                    101:
                    102:        default:
                    103:                /* there wasn't an invitation waiting for us */
                    104:                return (0);
                    105:        }
                    106: }