/*	$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);
}