/*      $OpenBSD: biz22.c,v 1.13 2006/03/17 19:17:13 moritz Exp $       */
/*      $NetBSD: biz22.c,v 1.6 1997/02/11 09:24:11 mrg Exp $    */

/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * 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. 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.
 */

#include "tip.h"

#define DISCONNECT_CMD  "\20\04"        /* disconnection string */

static  int dialtimeout = 0;
static  jmp_buf timeoutbuf;

static int      biz_dialer(char *, char *);
static void     sigALRM(int);
static int      cmd(char *);
static int      detect(char *);

/*
 * Dial up on a BIZCOMP Model 1022 with either
 *      tone dialing (mod = "V")
 *      pulse dialing (mod = "W")
 */
static int
biz_dialer(char *num, char *mod)
{
        int connected = 0;
        char cbuf[40];

        if (boolean(value(VERBOSE)))
                printf("\nstarting call...");
        /*
         * Disable auto-answer and configure for tone/pulse
         *  dialing
         */
        if (cmd("\02K\r")) {
                printf("can't initialize bizcomp...");
                return (0);
        }
        (void)strlcpy(cbuf, "\02.\r", sizeof cbuf);
        cbuf[1] = *mod;
        if (cmd(cbuf)) {
                printf("can't set dialing mode...");
                return (0);
        }
        (void)snprintf(cbuf, sizeof(cbuf), "\02D%s\r", num);
        write(FD, cbuf, strlen(cbuf));
        if (!detect("7\r")) {
                printf("can't get dial tone...");
                return (0);
        }
        if (boolean(value(VERBOSE)))
                printf("ringing...");
        /*
         * The reply from the BIZCOMP should be:
         *      2 \r or 7 \r    failure
         *      1 \r            success
         */
        connected = detect("1\r");
#ifdef ACULOG
        if (dialtimeout) {
                char line[80];

                (void)snprintf(line, sizeof line, "%ld second dial timeout",
                        number(value(DIALTIMEOUT)));
                logent(value(HOST), num, "biz1022", line);
        }
#endif
        if (dialtimeout)
                biz22_disconnect();     /* insurance */
        return (connected);
}

int
biz22w_dialer(char *num, char *acu)
{
        return (biz_dialer(num, "W"));
}

int
biz22f_dialer(char *num, char *acu)
{
        return (biz_dialer(num, "V"));
}

void
biz22_disconnect(void)
{
        write(FD, DISCONNECT_CMD, sizeof(DISCONNECT_CMD)-1);
        sleep(2);
        tcflush(FD, TCIOFLUSH);
}

void
biz22_abort(void)
{
        write(FD, "\02", 1);
}

/*ARGSUSED*/
static void
sigALRM(int signo)
{
        dialtimeout = 1;
        longjmp(timeoutbuf, 1);
}

static int
cmd(char *s)
{
        sig_t f;
        char c;

        write(FD, s, strlen(s));
        f = signal(SIGALRM, sigALRM);
        if (setjmp(timeoutbuf)) {
                biz22_abort();
                signal(SIGALRM, f);
                return (1);
        }
        alarm(number(value(DIALTIMEOUT)));
        read(FD, &c, 1);
        alarm(0);
        signal(SIGALRM, f);
        c &= 0177;
        return (c != '\r');
}

static int
detect(char *s)
{
        sig_t f;
        char c;

        f = signal(SIGALRM, sigALRM);
        dialtimeout = 0;
        while (*s) {
                if (setjmp(timeoutbuf)) {
                        biz22_abort();
                        break;
                }
                alarm(number(value(DIALTIMEOUT)));
                read(FD, &c, 1);
                alarm(0);
                c &= 0177;
                if (c != *s++)
                        return (0);
        }
        signal(SIGALRM, f);
        return (dialtimeout == 0);
}