usr.bin/talk/invite.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 1994 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*  Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
/*    All Rights Reserved   */

/*
 * University Copyright- Copyright (c) 1982, 1986, 1988
 * The Regents of the University of California
 * All Rights Reserved
 *
 * University Acknowledgment- Portions of this document are derived from
 * software developed by the University of California, Berkeley, and its
 * contributors.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include "talk_ctl.h"
#include <sys/time.h>
#include <signal.h>
#include <setjmp.h>
#include <libintl.h>

#ifdef SYSV
#define signal(s, f)    sigset(s, f)
#endif /* SYSV */

    /*
     * there wasn't an invitation waiting, so send a request containing
     * our sockt address to the remote talk daemon so it can invite
     * him
     */

static int local_id, remote_id;

    /*
     * the msg.id's for the invitations
     * on the local and remote machines.
     * These are used to delete the invitations.
     */

static jmp_buf  invitebuf;

static void re_invite();
static void announce_invite();

void
invite_remote()
{
    int new_sockt;
    struct itimerval itimer;
    CTL_RESPONSE response;

    itimer.it_value.tv_sec = RING_WAIT;
    itimer.it_value.tv_usec = 0;
    itimer.it_interval = itimer.it_value;

    if (listen(sockt, 5) != 0) {
        p_error(gettext("Error on attempt to listen for caller"));
    }

    msg.addr = my_addr;
    msg.id_num = -1;        /* an impossible id_num */

    invitation_waiting = 1;

    announce_invite();

    /*
     * shut off the automatic messages for a while,
     * so we can use the interupt timer to resend the invitation
     */

    end_msgs();
    setitimer(ITIMER_REAL, &itimer, (struct itimerval *)0);
    message(gettext("Waiting for your party to respond"));
    signal(SIGALRM, re_invite);
    (void) setjmp(invitebuf);

    while ((new_sockt = accept(sockt, 0, 0)) < 0) {
        if (errno != EINTR) {
            p_error(gettext("Unable to connect with your party"));
        } else {
        /* we just returned from a interupt, keep trying */
            continue;
        }
    }

    close(sockt);
    sockt = new_sockt;

    /*
     * have the daemons delete the invitations now that we have connected.
     */

    current_state = strdup(gettext("Waiting for your party to respond"));
    start_msgs();

    msg.id_num = local_id;
    ctl_transact(my_machine_addr, msg, DELETE, &response);
    msg.id_num = remote_id;
    ctl_transact(rem_machine_addr, msg, DELETE, &response);
    invitation_waiting = 0;
}

    /* routine called on interupt to re-invite the callee */

static void
re_invite()
{
    message(gettext("Ringing your party again"));
    current_line++;
    /* force a re-announce */
    msg.id_num = remote_id + 1;
    announce_invite();
    longjmp(invitebuf, 1);
}

    /* transmit the invitation and process the response */

static void
announce_invite()
{
    CTL_RESPONSE response;

    current_state =
        gettext("Trying to connect to your party's talk daemon");

    ctl_transact(rem_machine_addr, msg, ANNOUNCE, &response);
    remote_id = response.id_num;

    if (response.answer != SUCCESS) {

        switch (response.answer) {

            case NOT_HERE :
            message(gettext("Your party is not logged on"));
            break;

            case MACHINE_UNKNOWN :
            message(
            gettext("Target machine does not recognize us"));
            break;

            case UNKNOWN_REQUEST :
            message(
            gettext("Target machine can not handle remote talk"));
            break;

            case FAILED :
            message(
        gettext("Target machine is too confused to talk to us"));
            break;

            case PERMISSION_DENIED :
            message(gettext("Your party is refusing messages"));
            break;
        }

        quit();
    }

    /* leave the actual invitation on my talk daemon */

    ctl_transact(my_machine_addr, msg, LEAVE_INVITE, &response);
    local_id = response.id_num;
}

void
send_delete()
{

    /* tell the daemon to remove your invitation */

    msg.type = DELETE;

    /*
     * this is just a extra clean up, so just send it
     * and don't wait for an answer
     */

    msg.id_num = remote_id;
    daemon_addr.sin_addr = rem_machine_addr;
    if (sendto(ctl_sockt, (char *)&msg, sizeof (CTL_MSG), 0,
        (struct sockaddr *)&daemon_addr,
            sizeof (daemon_addr)) != sizeof (CTL_MSG)) {
        perror(gettext("send_delete remote"));
    }

    msg.id_num = local_id;
    daemon_addr.sin_addr = my_machine_addr;
    if (sendto(ctl_sockt, (char *)&msg, sizeof (CTL_MSG), 0,
        (struct sockaddr *)&daemon_addr,
            sizeof (daemon_addr)) != sizeof (CTL_MSG)) {
        perror(gettext("send_delete local"));
    }
}