freebsd-skq/usr.bin/tip/libacu/multitech.c
phk d8ac409160 Many places in the code NULL is used in integer context, where
plain 0 should be used.  This happens to work because we #define
NULL to 0, but is stylistically wrong and can cause problems
for people trying to port bits of code to other environments.

PR:		2752
Submitted by:	Arne Henrik Juul <arnej@imf.unit.no>
1997-09-18 14:08:40 +00:00

403 lines
9.2 KiB
C

/*
* Copyright (c) 1986, 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*/
#ifndef lint
static char sccsid[] = "@(#)multitech.c 8.1 (Berkeley) 6/6/93";
#endif /* not lint */
/*
* Routines for calling up on a Courier modem.
* Derived from Hayes driver.
*/
#include "tipconf.h"
#include "tip.h"
#include "acucommon.h"
#include <stdio.h>
/* #define DEBUG */
#define MAXRETRY 5
/*
Configuration
*/
static CONST char *dial_command = "ATDT";
static CONST char *hangup_command = "ATH\r";
static CONST char *echo_off_command = "ATE0\r";
static CONST char *reset_command = "\rATZ\r";
static CONST char *init_string = "AT$BA0$SB38400&E1&E4&E13&E15Q0V1X4E0S0=0\r";
static CONST char *escape_sequence = "+++"; /* return to command escape sequence */
static CONST int lock_baud = 1;
static CONST unsigned int intercharacter_delay = 20;
static CONST unsigned int intercommand_delay = 250;
static CONST unsigned int escape_guard_time = 250;
static CONST unsigned int reset_delay = 2000;
/*
Forward declarations
*/
void multitech_write (int fd, CONST char *cp, int n);
void multitech_write_str (int fd, CONST char *cp);
void multitech_disconnect ();
void acu_nap (unsigned int how_long);
static void sigALRM ();
static int multitechsync ();
static int multitech_swallow (register char *match);
/*
Global vars
*/
static int timeout = 0;
static int connected = 0;
static jmp_buf timeoutbuf, intbuf;
int multitech_dialer (register char *num, char *acu)
{
register char *cp;
#if ACULOG
char line [80];
#endif
static int multitech_connect(), multitech_swallow();
if (lock_baud)
{
int i;
if ((i = speed(number(value(BAUDRATE)))) == 0)
return 0;
ttysetup (i);
}
if (boolean(value(VERBOSE)))
printf("Using \"%s\"\n", acu);
acu_hupcl ();
/*
* Get in synch.
*/
if (!multitechsync()) {
badsynch:
printf("can't synchronize with multitech\n");
#if ACULOG
logent(value(HOST), num, "multitech", "can't synch up");
#endif
return (0);
}
acu_nap (intercommand_delay);
multitech_write_str (FD, echo_off_command); /* turn off echoing */
sleep(1);
#ifdef DEBUG
if (boolean(value(VERBOSE)))
multitech_verbose_read();
#endif
acu_flush ();
acu_nap (intercommand_delay);
multitech_write_str (FD, init_string);
if (!multitech_swallow ("\r\nOK\r\n"))
goto badsynch;
fflush (stdout);
acu_nap (intercommand_delay);
multitech_write_str (FD, dial_command);
for (cp = num; *cp; cp++)
if (*cp == '=')
*cp = ',';
multitech_write_str (FD, num);
multitech_write_str (FD, "\r");
connected = multitech_connect();
#if ACULOG
if (timeout) {
sprintf(line, "%d second dial timeout",
number(value(DIALTIMEOUT)));
logent(value(HOST), num, "multitech", line);
}
#endif
if (timeout)
multitech_disconnect ();
return (connected);
}
void multitech_disconnect ()
{
int okay, retries;
for (retries = okay = 0; retries < 3 && !okay; retries++)
{
/* first hang up the modem*/
ioctl (FD, TIOCCDTR, 0);
acu_nap (escape_guard_time);
ioctl (FD, TIOCSDTR, 0);
acu_nap (escape_guard_time);
/*
* If not strapped for DTR control, try to get command mode.
*/
acu_nap (escape_guard_time);
multitech_write_str (FD, escape_sequence);
acu_nap (escape_guard_time);
multitech_write_str (FD, hangup_command);
okay = multitech_swallow ("\r\nOK\r\n");
}
if (!okay)
{
#if ACULOG
logent(value(HOST), "", "multitech", "can't hang up modem");
#endif
if (boolean(value(VERBOSE)))
printf("hang up failed\n");
}
close (FD);
}
void multitech_abort ()
{
multitech_write_str (FD, "\r"); /* send anything to abort the call */
multitech_disconnect ();
}
static void sigALRM ()
{
(void) printf("\07timeout waiting for reply\n");
timeout = 1;
longjmp(timeoutbuf, 1);
}
static int multitech_swallow (register char *match)
{
sig_t f;
char c;
f = signal(SIGALRM, sigALRM);
timeout = 0;
do {
if (*match =='\0') {
signal(SIGALRM, f);
return (1);
}
if (setjmp(timeoutbuf)) {
signal(SIGALRM, f);
return (0);
}
alarm(number(value(DIALTIMEOUT)));
read(FD, &c, 1);
alarm(0);
c &= 0177;
#ifdef DEBUG
if (boolean(value(VERBOSE)))
putchar(c);
#endif
} while (c == *match++);
#ifdef DEBUG
if (boolean(value(VERBOSE)))
fflush (stdout);
#endif
signal(SIGALRM, SIG_DFL);
return (0);
}
static struct baud_msg {
char *msg;
int baud;
} baud_msg[] = {
"", B300,
" 1200", B1200,
" 2400", B2400,
" 9600", B9600,
" 9600/ARQ", B9600,
0, 0,
};
static int multitech_connect ()
{
char c;
int nc, nl, n;
char dialer_buf[64];
struct baud_msg *bm;
sig_t f;
if (multitech_swallow("\r\n") == 0)
return (0);
f = signal(SIGALRM, sigALRM);
again:
nc = 0; nl = sizeof(dialer_buf)-1;
bzero(dialer_buf, sizeof(dialer_buf));
timeout = 0;
for (nc = 0, nl = sizeof(dialer_buf)-1 ; nl > 0 ; nc++, nl--) {
if (setjmp(timeoutbuf))
break;
alarm(number(value(DIALTIMEOUT)));
n = read(FD, &c, 1);
alarm(0);
if (n <= 0)
break;
c &= 0x7f;
if (c == '\r') {
if (multitech_swallow("\n") == 0)
break;
if (!dialer_buf[0])
goto again;
if (strcmp(dialer_buf, "RINGING") == 0 &&
boolean(value(VERBOSE))) {
#ifdef DEBUG
printf("%s\r\n", dialer_buf);
#endif
goto again;
}
if (strncmp(dialer_buf, "CONNECT",
sizeof("CONNECT")-1) != 0)
break;
if (lock_baud) {
signal(SIGALRM, f);
#ifdef DEBUG
if (boolean(value(VERBOSE)))
printf("%s\r\n", dialer_buf);
#endif
return (1);
}
for (bm = baud_msg ; bm->msg ; bm++)
if (strcmp(bm->msg, dialer_buf+sizeof("CONNECT")-1) == 0) {
if (!acu_setspeed (bm->baud))
goto error;
signal(SIGALRM, f);
#ifdef DEBUG
if (boolean(value(VERBOSE)))
printf("%s\r\n", dialer_buf);
#endif
return (1);
}
break;
}
dialer_buf[nc] = c;
}
error1:
printf("%s\r\n", dialer_buf);
error:
signal(SIGALRM, f);
return (0);
}
/*
* This convoluted piece of code attempts to get
* the multitech in sync.
*/
static int multitechsync ()
{
int already = 0;
int len;
char buf[40];
while (already++ < MAXRETRY) {
acu_nap (intercommand_delay);
ioctl (FD, TIOCFLUSH, 0); /* flush any clutter */
multitech_write_str (FD, reset_command); /* reset modem */
bzero(buf, sizeof(buf));
acu_nap (reset_delay);
ioctl (FD, FIONREAD, &len);
if (len) {
len = read(FD, buf, sizeof(buf));
#ifdef DEBUG
buf [len] = '\0';
printf("multitechsync: (\"%s\")\n\r", buf);
#endif
if (index(buf, '0') ||
(index(buf, 'O') && index(buf, 'K')))
return(1);
}
/*
* If not strapped for DTR control,
* try to get command mode.
*/
acu_nap (escape_guard_time);
multitech_write_str (FD, escape_sequence);
acu_nap (escape_guard_time);
multitech_write_str (FD, hangup_command);
/*
* Toggle DTR to force anyone off that might have left
* the modem connected.
*/
acu_nap (escape_guard_time);
ioctl (FD, TIOCCDTR, 0);
acu_nap (escape_guard_time);
ioctl (FD, TIOCSDTR, 0);
}
acu_nap (intercommand_delay);
multitech_write_str (FD, reset_command);
return (0);
}
void multitech_write_str (int fd, const char *cp)
{
#ifdef DEBUG
printf ("multitech: sending %s\n", cp);
#endif
multitech_write (fd, cp, strlen (cp));
}
void multitech_write (int fd, const char *cp, int n)
{
acu_flush ();
acu_nap (intercharacter_delay);
for ( ; n-- ; cp++) {
write (fd, cp, 1);
acu_flush ();
acu_nap (intercharacter_delay);
}
}
#ifdef DEBUG
multitech_verbose_read()
{
int n = 0;
char buf[BUFSIZ];
if (ioctl(FD, FIONREAD, &n) < 0)
return;
if (n <= 0)
return;
if (read(FD, buf, n) != n)
return;
write(1, buf, n);
}
#endif
/* end of multitech.c */