1/*	$NetBSD: courier.c,v 1.15 2006/04/03 02:25:27 perry Exp $	*/
2
3/*
4 * Copyright (c) 1986, 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
35static char sccsid[] = "@(#)courier.c	8.1 (Berkeley) 6/6/93";
36#endif
37__RCSID("$NetBSD: courier.c,v 1.15 2006/04/03 02:25:27 perry Exp $");
38#endif /* not lint */
39
40/*
41 * Routines for calling up on a Courier modem.
42 * Derived from Hayes driver.
43 */
44#include "tip.h"
45
46#define	MAXRETRY	5
47
48static	int timeout = 0;
49static	int connected = 0;
50static	jmp_buf timeoutbuf;
51
52static	int	cour_connect(void);
53static	void	cour_nap(void);
54static	void	cour_napx(int);
55static	int	cour_swallow(const char *);
56static	int	coursync(void);
57#ifdef DEBUG
58static	void	cour_verbose_read(void);
59#endif
60static	void	cour_write(int, const char *, int);
61static	void	sigALRM(int);
62
63int
64cour_dialer(char *num, char *acu)
65{
66	char *cp;
67	struct termios cntrl;
68
69	if (boolean(value(VERBOSE)))
70		(void)printf("Using \"%s\"\n", acu);
71
72	(void)tcgetattr(FD, &cntrl);
73	cntrl.c_cflag |= HUPCL;
74	(void)tcsetattr(FD, TCSAFLUSH, &cntrl);
75	/*
76	 * Get in synch.
77	 */
78	if (!coursync()) {
79badsynch:
80		(void)printf("can't synchronize with courier\n");
81		return (0);
82	}
83	cour_write(FD, "AT E0\r", 6);	/* turn off echoing */
84	(void)sleep(1);
85#ifdef DEBUG
86	if (boolean(value(VERBOSE)))
87		cour_verbose_read();
88#endif
89	(void)tcflush(FD, TCIOFLUSH);
90	cour_write(FD, "AT C1 E0 H0 Q0 X6 V1\r", 21);
91	if (!cour_swallow("\r\nOK\r\n"))
92		goto badsynch;
93	(void)fflush(stdout);
94	cour_write(FD, "AT D", 4);
95	for (cp = num; *cp; cp++)
96		if (*cp == '=')
97			*cp = ',';
98	cour_write(FD, num, (int)strlen(num));
99	cour_write(FD, "\r", 1);
100	connected = cour_connect();
101	if (timeout)
102		cour_disconnect();
103	return (connected);
104}
105
106void
107cour_disconnect(void)
108{
109
110	/* first hang up the modem*/
111	(void)ioctl(FD, TIOCCDTR, 0);
112	(void)sleep(1);
113	(void)ioctl(FD, TIOCSDTR, 0);
114	(void)coursync();				/* reset */
115	(void)close(FD);
116}
117
118void
119cour_abort(void)
120{
121
122	cour_write(FD, "\r", 1);	/* send anything to abort the call */
123	cour_disconnect();
124}
125
126static void
127/*ARGSUSED*/
128sigALRM(int dummy __unused)
129{
130
131	(void)printf("\07timeout waiting for reply\n");
132	timeout = 1;
133	longjmp(timeoutbuf, 1);
134}
135
136static int
137cour_swallow(const char * volatile match)
138{
139	sig_t f;
140	char c;
141
142	f = signal(SIGALRM, sigALRM);
143	timeout = 0;
144	do {
145		if (*match =='\0') {
146			(void)signal(SIGALRM, f);
147			return (1);
148		}
149		if (setjmp(timeoutbuf)) {
150			(void)signal(SIGALRM, f);
151			return (0);
152		}
153		(void)alarm((unsigned)number(value(DIALTIMEOUT)));
154		(void)read(FD, &c, 1);
155		(void)alarm(0);
156		c &= 0177;
157#ifdef DEBUG
158		if (boolean(value(VERBOSE)))
159			(void)putchar(c);
160#endif
161	} while (c == *match++);
162#ifdef DEBUG
163	if (boolean(value(VERBOSE)))
164		(void)fflush(stdout);
165#endif
166	(void)signal(SIGALRM, SIG_DFL);
167	return (0);
168}
169
170struct baud_msg {
171	const char *msg;
172	unsigned int baud;
173} baud_msg[] = {
174	{ "",		B300 },
175	{ " 1200",	B1200 },
176	{ " 2400",	B2400 },
177	{ " 9600",	B9600 },
178	{ " 9600/ARQ",	B9600 },
179	{ 0,		0 }
180};
181
182static int
183cour_connect(void)
184{
185	char c;
186	int volatile nc;
187	int volatile nl;
188	int n;
189	char dialer_buf[64];
190	struct baud_msg *bm;
191	sig_t f;
192
193	if (cour_swallow("\r\n") == 0)
194		return (0);
195	f = signal(SIGALRM, sigALRM);
196again:
197	(void)memset(dialer_buf, 0, sizeof(dialer_buf));
198	timeout = 0;
199	for (nc = 0, nl = sizeof(dialer_buf) - 1 ; nl > 0 ; nc++, nl--) {
200		if (setjmp(timeoutbuf))
201			break;
202		(void)alarm((unsigned)number(value(DIALTIMEOUT)));
203		n = read(FD, &c, 1);
204		(void)alarm(0);
205		if (n <= 0)
206			break;
207		c &= 0x7f;
208		if (c == '\r') {
209			if (cour_swallow("\n") == 0)
210				break;
211			if (!dialer_buf[0])
212				goto again;
213			if (strcmp(dialer_buf, "RINGING") == 0 &&
214			    boolean(value(VERBOSE))) {
215#ifdef DEBUG
216				(void)printf("%s\r\n", dialer_buf);
217#endif
218				goto again;
219			}
220			if (strncmp(dialer_buf, "CONNECT",
221				    sizeof("CONNECT")-1) != 0)
222				break;
223			for (bm = baud_msg ; bm->msg ; bm++)
224				if (strcmp(bm->msg,
225				    dialer_buf+sizeof("CONNECT")-1) == 0) {
226					struct termios	cntrl;
227
228					(void)tcgetattr(FD, &cntrl);
229					(void)cfsetospeed(&cntrl, bm->baud);
230					(void)cfsetispeed(&cntrl, bm->baud);
231					(void)tcsetattr(FD, TCSAFLUSH, &cntrl);
232					(void)signal(SIGALRM, f);
233#ifdef DEBUG
234					if (boolean(value(VERBOSE)))
235						(void)printf("%s\r\n", dialer_buf);
236#endif
237					return (1);
238				}
239			break;
240		}
241		dialer_buf[nc] = c;
242#ifdef notdef
243		if (boolean(value(VERBOSE)))
244			(void)putchar(c);
245#endif
246	}
247	(void)printf("%s\r\n", dialer_buf);
248	(void)signal(SIGALRM, f);
249	return (0);
250}
251
252/*
253 * This convoluted piece of code attempts to get
254 * the courier in sync.
255 */
256static int
257coursync(void)
258{
259	int already = 0;
260	int len;
261	char buf[40];
262
263	while (already++ < MAXRETRY) {
264		(void)tcflush(FD, TCIOFLUSH);
265		cour_write(FD, "\rAT Z\r", 6);	/* reset modem */
266		(void)memset(buf, 0, sizeof(buf));
267		(void)sleep(1);
268		(void)ioctl(FD, FIONREAD, &len);
269		if (len) {
270			len = read(FD, buf, sizeof(buf));
271#ifdef DEBUG
272			buf[len] = '\0';
273			(void)printf("coursync: (\"%s\")\n\r", buf);
274#endif
275			if (strchr(buf, '0') ||
276			   (strchr(buf, 'O') && strchr(buf, 'K')))
277				return(1);
278		}
279		/*
280		 * If not strapped for DTR control,
281		 * try to get command mode.
282		 */
283		(void)sleep(1);
284		cour_write(FD, "+++", 3);
285		(void)sleep(1);
286		/*
287		 * Toggle DTR to force anyone off that might have left
288		 * the modem connected.
289		 */
290		(void)ioctl(FD, TIOCCDTR, 0);
291		(void)sleep(1);
292		(void)ioctl(FD, TIOCSDTR, 0);
293	}
294	cour_write(FD, "\rAT Z\r", 6);
295	return (0);
296}
297
298static void
299cour_write(int fd, const char *cp, int n)
300{
301
302#ifdef notdef
303	if (boolean(value(VERBOSE)))
304		(void)write(1, cp, n);
305#endif
306	(void)tcdrain(fd);
307	cour_nap();
308	for ( ; n-- ; cp++) {
309		(void)write(fd, cp, 1);
310		(void)tcdrain(fd);
311		cour_nap();
312	}
313}
314
315#ifdef DEBUG
316static void
317cour_verbose_read(void)
318{
319	int n = 0;
320	char buf[BUFSIZ];
321
322	if (ioctl(FD, FIONREAD, &n) < 0)
323		return;
324	if (n <= 0)
325		return;
326	if (read(FD, buf, n) != n)
327		return;
328	(void)write(1, buf, n);
329}
330#endif
331
332#define setsa(sa, a) \
333	sa.sa_handler = a; (void)sigemptyset(&sa.sa_mask); sa.sa_flags = 0
334
335static int napms = 50; /* Give the courier 50 milliseconds between characters */
336
337static int ringring;
338
339void
340cour_nap(void)
341{
342
343	struct itimerval itv, oitv;
344	struct itimerval *itp = &itv;
345	struct sigaction sa, osa;
346	sigset_t sm, osm;
347
348	timerclear(&itp->it_interval);
349	timerclear(&itp->it_value);
350	if (setitimer(ITIMER_REAL, itp, &oitv) < 0)
351		return;
352
353	(void)sigemptyset(&sm);
354	(void)sigaddset(&sm, SIGALRM);
355	(void)sigprocmask(SIG_BLOCK, &sm, &osm);
356
357	itp->it_value.tv_sec = napms/1000;
358	itp->it_value.tv_usec = ((napms%1000)*1000);
359
360	setsa(sa, cour_napx);
361	(void)sigaction(SIGALRM, &sa, &osa);
362
363	(void)setitimer(ITIMER_REAL, itp, NULL);
364
365	sm = osm;
366	(void)sigdelset(&sm, SIGALRM);
367
368	for (ringring = 0; !ringring; )
369		(void)sigsuspend(&sm);
370
371	(void)sigaction(SIGALRM, &osa, NULL);
372	(void)setitimer(ITIMER_REAL, &oitv, NULL);
373	(void)sigprocmask(SIG_SETMASK, &osm, NULL);
374}
375
376static void
377/*ARGSUSED*/
378cour_napx(int dummy __unused)
379{
380
381	ringring = 1;
382}
383