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biz22.c revision 1.11 
      1 /*	$NetBSD: biz22.c,v 1.11 2006/04/03 02:25:27 perry 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 1.11 2006/04/03 02:25:27 perry 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 		printf("\nstarting call...");
     65 	/*
     66 	 * Disable auto-answer and configure for tone/pulse
     67 	 *  dialing
     68 	 */
     69 	if (cmd("\02K\r")) {
     70 		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 		printf("can't set dialing mode...");
     77 		return (0);
     78 	}
     79 	(void)snprintf(cbuf, sizeof cbuf, "\02D%s\r", num);
     80 	write(FD, cbuf, strlen(cbuf));
     81 	if (!detect("7\r")) {
     82 		printf("can't get dial tone...");
     83 		return (0);
     84 	}
     85 	if (boolean(value(VERBOSE)))
     86 		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 biz22w_dialer(char *num, char *acu)
    100 {
    101 
    102 	return (biz_dialer(num, "W"));
    103 }
    104 
    105 int
    106 biz22f_dialer(char *num, char *acu)
    107 {
    108 
    109 	return (biz_dialer(num, "V"));
    110 }
    111 
    112 void
    113 biz22_disconnect(void)
    114 {
    115 
    116 	write(FD, DISCONNECT_CMD, 4);
    117 	sleep(2);
    118 	tcflush(FD, TCIOFLUSH);
    119 }
    120 
    121 void
    122 biz22_abort(void)
    123 {
    124 
    125 	write(FD, "\02", 1);
    126 }
    127 
    128 static void
    129 sigALRM(int dummy)
    130 {
    131 
    132 	btimeout = 1;
    133 	longjmp(timeoutbuf, 1);
    134 }
    135 
    136 static int
    137 cmd(const char *s)
    138 {
    139 	sig_t f;
    140 	char c;
    141 
    142 	write(FD, s, strlen(s));
    143 	f = signal(SIGALRM, sigALRM);
    144 	if (setjmp(timeoutbuf)) {
    145 		biz22_abort();
    146 		signal(SIGALRM, f);
    147 		return (1);
    148 	}
    149 	alarm(number(value(DIALTIMEOUT)));
    150 	read(FD, &c, 1);
    151 	alarm(0);
    152 	signal(SIGALRM, f);
    153 	c &= 0177;
    154 	return (c != '\r');
    155 }
    156 
    157 static int
    158 detect(const char *s)
    159 {
    160 	sig_t f;
    161 	char c;
    162 
    163 #if __GNUC__	/* XXX pacify gcc */
    164 	(void)&s;
    165 #endif
    166 
    167 	f = signal(SIGALRM, sigALRM);
    168 	btimeout = 0;
    169 	while (*s) {
    170 		if (setjmp(timeoutbuf)) {
    171 			biz22_abort();
    172 			break;
    173 		}
    174 		alarm(number(value(DIALTIMEOUT)));
    175 		read(FD, &c, 1);
    176 		alarm(0);
    177 		c &= 0177;
    178 		if (c != *s++)
    179 			return (0);
    180 	}
    181 	signal(SIGALRM, f);
    182 	return (btimeout == 0);
    183 }
    184