1/*	$OpenBSD: ventel.c,v 1.12 2006/03/17 19:17:13 moritz Exp $	*/
2/*	$NetBSD: ventel.c,v 1.6 1997/02/11 09:24:21 mrg Exp $	*/
3
4/*-
5 * SPDX-License-Identifier: BSD-3-Clause
6 *
7 * Copyright (c) 1983, 1993
8 *	The Regents of the University of California.  All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35/*
36 * Routines for calling up on a Ventel Modem
37 * The Ventel is expected to be strapped for local echo (just like uucp)
38 */
39#include "tip.h"
40#include <termios.h>
41#include <sys/ioctl.h>
42
43#define	MAXRETRY	5
44
45static	int dialtimeout = 0;
46static	jmp_buf timeoutbuf;
47
48static void	echo(char *);
49static void	sigALRM(int);
50static int	gobble(char, char *);
51static int	vensync(int);
52
53/*
54 * some sleep calls have been replaced by this macro
55 * because some ventel modems require two <cr>s in less than
56 * a second in order to 'wake up'... yes, it is dirty...
57 */
58#define delay(num,denom) busyloop(CPUSPEED*num/denom)
59#define CPUSPEED 1000000	/* VAX 780 is 1MIPS */
60#define DELAY(n) do { long N = (n); while (--N > 0); } while (0)
61#define busyloop(n) do { DELAY(n); } while (0)
62
63int
64ven_dialer(char *num, char *acu)
65{
66	char *cp;
67	int connected = 0;
68	char *msg, line[80];
69	struct termios	cntrl;
70
71	/*
72	 * Get in synch with a couple of carriage returns
73	 */
74	if (!vensync(FD)) {
75		printf("can't synchronize with ventel\n");
76#ifdef ACULOG
77		logent(value(HOST), num, "ventel", "can't synch up");
78#endif
79		return (0);
80	}
81	if (boolean(value(VERBOSE)))
82		printf("\ndialing...");
83	fflush(stdout);
84	tcgetattr(FD, &cntrl);
85	cntrl.c_cflag |= HUPCL;
86	tcsetattr(FD, TCSANOW, &cntrl);
87	echo("#k$\r$\n$D$I$A$L$:$ ");
88	for (cp = num; *cp; cp++) {
89		delay(1, 10);
90		write(FD, cp, 1);
91	}
92	delay(1, 10);
93	write(FD, "\r", 1);
94	gobble('\n', line);
95	if (gobble('\n', line))
96		connected = gobble('!', line);
97	tcflush(FD, TCIOFLUSH);
98#ifdef ACULOG
99	if (dialtimeout) {
100		(void)snprintf(line, sizeof line, "%ld second dial timeout",
101			number(value(DIALTIMEOUT)));
102		logent(value(HOST), num, "ventel", line);
103	}
104#endif
105	if (dialtimeout)
106		ven_disconnect();	/* insurance */
107	if (connected || dialtimeout || !boolean(value(VERBOSE)))
108		return (connected);
109	/* call failed, parse response for user */
110	cp = strchr(line, '\r');
111	if (cp)
112		*cp = '\0';
113	for (cp = line; (cp = strchr(cp, ' ')) != NULL; cp++)
114		if (cp[1] == ' ')
115			break;
116	if (cp) {
117		while (*cp == ' ')
118			cp++;
119		msg = cp;
120		while (*cp) {
121			if (isupper(*cp))
122				*cp = tolower(*cp);
123			cp++;
124		}
125		printf("%s...", msg);
126	}
127	return (connected);
128}
129
130void
131ven_disconnect(void)
132{
133	close(FD);
134}
135
136void
137ven_abort(void)
138{
139	write(FD, "\03", 1);
140	close(FD);
141}
142
143static void
144echo(char *s)
145{
146	char c;
147
148	while ((c = *s++) != '\0')
149		switch (c) {
150		case '$':
151			read(FD, &c, 1);
152			s++;
153			break;
154
155		case '#':
156			c = *s++;
157			write(FD, &c, 1);
158			break;
159
160		default:
161			write(FD, &c, 1);
162			read(FD, &c, 1);
163		}
164}
165
166/*ARGSUSED*/
167static void
168sigALRM(int signo)
169{
170	printf("\07timeout waiting for reply\n");
171	dialtimeout = 1;
172	longjmp(timeoutbuf, 1);
173}
174
175static int
176gobble(char match, char response[])
177{
178	char *cp = response;
179	sig_t f;
180	char c;
181
182	f = signal(SIGALRM, sigALRM);
183	dialtimeout = 0;
184	do {
185		if (setjmp(timeoutbuf)) {
186			signal(SIGALRM, f);
187			*cp = '\0';
188			return (0);
189		}
190		alarm(number(value(DIALTIMEOUT)));
191		read(FD, cp, 1);
192		alarm(0);
193		c = (*cp++ &= 0177);
194#ifdef notdef
195		if (boolean(value(VERBOSE)))
196			putchar(c);
197#endif
198	} while (c != '\n' && c != match);
199	signal(SIGALRM, SIG_DFL);
200	*cp = '\0';
201	return (c == match);
202}
203
204#define min(a,b)	((a)>(b)?(b):(a))
205/*
206 * This convoluted piece of code attempts to get
207 * the ventel in sync.  If you don't have FIONREAD
208 * there are gory ways to simulate this.
209 */
210static int
211vensync(int fd)
212{
213	int already = 0, nread;
214	char buf[60];
215
216	/*
217	 * Toggle DTR to force anyone off that might have left
218	 * the modem connected, and insure a consistent state
219	 * to start from.
220	 *
221	 * If you don't have the ioctl calls to diddle directly
222	 * with DTR, you can always try setting the baud rate to 0.
223	 */
224	ioctl(FD, TIOCCDTR, 0);
225	sleep(1);
226	ioctl(FD, TIOCSDTR, 0);
227	while (already < MAXRETRY) {
228		/*
229		 * After reseting the modem, send it two \r's to
230		 * autobaud on. Make sure to delay between them
231		 * so the modem can frame the incoming characters.
232		 */
233		write(fd, "\r", 1);
234		delay(1,10);
235		write(fd, "\r", 1);
236		sleep(2);
237		if (ioctl(fd, FIONREAD, (caddr_t)&nread) < 0) {
238			perror("tip: ioctl");
239			continue;
240		}
241		while (nread > 0) {
242			read(fd, buf, min(nread, 60));
243			if ((buf[nread - 1] & 0177) == '$')
244				return (1);
245			nread -= min(nread, 60);
246		}
247		sleep(1);
248		already++;
249	}
250	return (0);
251}
252