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      1 /*	$NetBSD: biz22.c,v 1.13 2006/12/14 17:09:43 christos Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1983, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #ifndef lint
     34 #if 0
     35 static char sccsid[] = "@(#)biz22.c	8.1 (Berkeley) 6/6/93";
     36 #endif
     37 __RCSID("$NetBSD: biz22.c,v 1.13 2006/12/14 17:09:43 christos Exp $");
     38 #endif /* not lint */
     39 
     40 #include "tip.h"
     41 
     42 #define DISCONNECT_CMD	"\20\04"	/* disconnection string */
     43 
     44 static	int btimeout = 0;
     45 static	jmp_buf timeoutbuf;
     46 
     47 static	int	biz_dialer(char *, const char *);
     48 static	int	cmd(const char *);
     49 static	int	detect(const char *);
     50 static	void	sigALRM(int);
     51 
     52 /*
     53  * Dial up on a BIZCOMP Model 1022 with either
     54  * 	tone dialing (mod = "V")
     55  *	pulse dialing (mod = "W")
     56  */
     57 static int
     58 biz_dialer(char *num, const char *mod)
     59 {
     60 	int connected = 0;
     61 	char cbuf[40];
     62 
     63 	if (boolean(value(VERBOSE)))
     64 		(void)printf("\nstarting call...");
     65 	/*
     66 	 * Disable auto-answer and configure for tone/pulse
     67 	 *  dialing
     68 	 */
     69 	if (cmd("\02K\r")) {
     70 		(void)printf("can't initialize bizcomp...");
     71 		return (0);
     72 	}
     73 	(void)strncpy(cbuf, "\02.\r", sizeof(cbuf) - 1);
     74 	cbuf[1] = *mod;
     75 	if (cmd(cbuf)) {
     76 		(void)printf("can't set dialing mode...");
     77 		return (0);
     78 	}
     79 	(void)snprintf(cbuf, sizeof cbuf, "\02D%s\r", num);
     80 	(void)write(FD, cbuf, strlen(cbuf));
     81 	if (!detect("7\r")) {
     82 		(void)printf("can't get dial tone...");
     83 		return (0);
     84 	}
     85 	if (boolean(value(VERBOSE)))
     86 		(void)printf("ringing...");
     87 	/*
     88 	 * The reply from the BIZCOMP should be:
     89 	 *	2 \r or 7 \r	failure
     90 	 *	1 \r		success
     91 	 */
     92 	connected = detect("1\r");
     93 	if (btimeout)
     94 		biz22_disconnect();	/* insurance */
     95 	return (connected);
     96 }
     97 
     98 int
     99 /*ARGSUSED*/
    100 biz22w_dialer(char *num, char *acu __unused)
    101 {
    102 
    103 	return (biz_dialer(num, "W"));
    104 }
    105 
    106 int
    107 /*ARGSUSED*/
    108 biz22f_dialer(char *num, char *acu __unused)
    109 {
    110 
    111 	return (biz_dialer(num, "V"));
    112 }
    113 
    114 void
    115 biz22_disconnect(void)
    116 {
    117 
    118 	(void)write(FD, DISCONNECT_CMD, 4);
    119 	(void)sleep(2);
    120 	(void)tcflush(FD, TCIOFLUSH);
    121 }
    122 
    123 void
    124 biz22_abort(void)
    125 {
    126 
    127 	(void)write(FD, "\02", 1);
    128 }
    129 
    130 static void
    131 /*ARGSUSED*/
    132 sigALRM(int dummy __unused)
    133 {
    134 
    135 	btimeout = 1;
    136 	longjmp(timeoutbuf, 1);
    137 }
    138 
    139 static int
    140 cmd(const char *s)
    141 {
    142 	sig_t f;
    143 	char c;
    144 
    145 	(void)write(FD, s, strlen(s));
    146 	f = signal(SIGALRM, sigALRM);
    147 	if (setjmp(timeoutbuf)) {
    148 		biz22_abort();
    149 		(void)signal(SIGALRM, f);
    150 		return (1);
    151 	}
    152 	(void)alarm((unsigned)number(value(DIALTIMEOUT)));
    153 	(void)read(FD, &c, 1);
    154 	(void)alarm(0);
    155 	(void)signal(SIGALRM, f);
    156 	c &= 0177;
    157 	return (c != '\r');
    158 }
    159 
    160 static int
    161 detect(const char * volatile s)
    162 {
    163 	sig_t f;
    164 	char c;
    165 
    166 	f = signal(SIGALRM, sigALRM);
    167 	btimeout = 0;
    168 	while (*s) {
    169 		if (setjmp(timeoutbuf)) {
    170 			biz22_abort();
    171 			break;
    172 		}
    173 		(void)alarm((unsigned)number(value(DIALTIMEOUT)));
    174 		(void)read(FD, &c, 1);
    175 		(void)alarm(0);
    176 		c &= 0177;
    177 		if (c != *s++)
    178 			return (0);
    179 	}
    180 	(void)signal(SIGALRM, f);
    181 	return (btimeout == 0);
    182 }
    183