4.4BSD/usr/src/usr.bin/tip/aculib/hayes.c
/*
* Copyright (c) 1983, 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[] = "@(#)hayes.c 8.1 (Berkeley) 6/6/93";
#endif /* not lint */
/*
* Routines for calling up on a Hayes Modem
* (based on the old VenTel driver).
* The modem is expected to be strapped for "echo".
* Also, the switches enabling the DTR and CD lines
* must be set correctly.
* NOTICE:
* The easy way to hang up a modem is always simply to
* clear the DTR signal. However, if the +++ sequence
* (which switches the modem back to local mode) is sent
* before modem is hung up, removal of the DTR signal
* has no effect (except that it prevents the modem from
* recognizing commands).
* (by Helge Skrivervik, Calma Company, Sunnyvale, CA. 1984)
*/
/*
* TODO:
* It is probably not a good idea to switch the modem
* state between 'verbose' and terse (status messages).
* This should be kicked out and we should use verbose
* mode only. This would make it consistent with normal
* interactive use thru the command 'tip dialer'.
*/
#include "tip.h"
#define min(a,b) ((a < b) ? a : b)
static void sigALRM();
static int timeout = 0;
static jmp_buf timeoutbuf;
static char gobble();
#define DUMBUFLEN 40
static char dumbuf[DUMBUFLEN];
#define DIALING 1
#define IDLE 2
#define CONNECTED 3
#define FAILED 4
static int state = IDLE;
hay_dialer(num, acu)
register char *num;
char *acu;
{
register char *cp;
register int connected = 0;
char dummy;
#ifdef ACULOG
char line[80];
#endif
if (hay_sync() == 0) /* make sure we can talk to the modem */
return(0);
if (boolean(value(VERBOSE)))
printf("\ndialing...");
fflush(stdout);
ioctl(FD, TIOCHPCL, 0);
ioctl(FD, TIOCFLUSH, 0); /* get rid of garbage */
write(FD, "ATv0\r", 5); /* tell modem to use short status codes */
gobble("\r");
gobble("\r");
write(FD, "ATTD", 4); /* send dial command */
write(FD, num, strlen(num));
state = DIALING;
write(FD, "\r", 1);
connected = 0;
if (gobble("\r")) {
if ((dummy = gobble("01234")) != '1')
error_rep(dummy);
else
connected = 1;
}
if (connected)
state = CONNECTED;
else {
state = FAILED;
return (connected); /* lets get out of here.. */
}
ioctl(FD, TIOCFLUSH, 0);
#ifdef ACULOG
if (timeout) {
sprintf(line, "%d second dial timeout",
number(value(DIALTIMEOUT)));
logent(value(HOST), num, "hayes", line);
}
#endif
if (timeout)
hay_disconnect(); /* insurance */
return (connected);
}
hay_disconnect()
{
char c;
int len, rlen;
/* first hang up the modem*/
#ifdef DEBUG
printf("\rdisconnecting modem....\n\r");
#endif
ioctl(FD, TIOCCDTR, 0);
sleep(1);
ioctl(FD, TIOCSDTR, 0);
goodbye();
}
hay_abort()
{
char c;
write(FD, "\r", 1); /* send anything to abort the call */
hay_disconnect();
}
static void
sigALRM()
{
printf("\07timeout waiting for reply\n\r");
timeout = 1;
longjmp(timeoutbuf, 1);
}
static char
gobble(match)
register char *match;
{
char c;
sig_t f;
int i, status = 0;
f = signal(SIGALRM, sigALRM);
timeout = 0;
#ifdef DEBUG
printf("\ngobble: waiting for %s\n", match);
#endif
do {
if (setjmp(timeoutbuf)) {
signal(SIGALRM, f);
return (0);
}
alarm(number(value(DIALTIMEOUT)));
read(FD, &c, 1);
alarm(0);
c &= 0177;
#ifdef DEBUG
printf("%c 0x%x ", c, c);
#endif
for (i = 0; i < strlen(match); i++)
if (c == match[i])
status = c;
} while (status == 0);
signal(SIGALRM, SIG_DFL);
#ifdef DEBUG
printf("\n");
#endif
return (status);
}
error_rep(c)
register char c;
{
printf("\n\r");
switch (c) {
case '0':
printf("OK");
break;
case '1':
printf("CONNECT");
break;
case '2':
printf("RING");
break;
case '3':
printf("NO CARRIER");
break;
case '4':
printf("ERROR in input");
break;
case '5':
printf("CONNECT 1200");
break;
default:
printf("Unknown Modem error: %c (0x%x)", c, c);
}
printf("\n\r");
return;
}
/*
* set modem back to normal verbose status codes.
*/
goodbye()
{
int len, rlen;
char c;
ioctl(FD, TIOCFLUSH, &len); /* get rid of trash */
if (hay_sync()) {
sleep(1);
#ifndef DEBUG
ioctl(FD, TIOCFLUSH, 0);
#endif
write(FD, "ATH0\r", 5); /* insurance */
#ifndef DEBUG
c = gobble("03");
if (c != '0' && c != '3') {
printf("cannot hang up modem\n\r");
printf("please use 'tip dialer' to make sure the line is hung up\n\r");
}
#endif
sleep(1);
ioctl(FD, FIONREAD, &len);
#ifdef DEBUG
printf("goodbye1: len=%d -- ", len);
rlen = read(FD, dumbuf, min(len, DUMBUFLEN));
dumbuf[rlen] = '\0';
printf("read (%d): %s\r\n", rlen, dumbuf);
#endif
write(FD, "ATv1\r", 5);
sleep(1);
#ifdef DEBUG
ioctl(FD, FIONREAD, &len);
printf("goodbye2: len=%d -- ", len);
rlen = read(FD, dumbuf, min(len, DUMBUFLEN));
dumbuf[rlen] = '\0';
printf("read (%d): %s\r\n", rlen, dumbuf);
#endif
}
ioctl(FD, TIOCFLUSH, 0); /* clear the input buffer */
ioctl(FD, TIOCCDTR, 0); /* clear DTR (insurance) */
close(FD);
}
#define MAXRETRY 5
hay_sync()
{
int len, retry = 0;
while (retry++ <= MAXRETRY) {
write(FD, "AT\r", 3);
sleep(1);
ioctl(FD, FIONREAD, &len);
if (len) {
len = read(FD, dumbuf, min(len, DUMBUFLEN));
if (index(dumbuf, '0') ||
(index(dumbuf, 'O') && index(dumbuf, 'K')))
return(1);
#ifdef DEBUG
dumbuf[len] = '\0';
printf("hay_sync: (\"%s\") %d\n\r", dumbuf, retry);
#endif
}
ioctl(FD, TIOCCDTR, 0);
ioctl(FD, TIOCSDTR, 0);
}
printf("Cannot synchronize with hayes...\n\r");
return(0);
}