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tdenetwork/kppp/modem.cpp

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/*
* kPPP: A pppd Front End for the KDE project
*
* $Id$
*
* Copyright (C) 1997 Bernd Johannes Wuebben
* wuebben@math.cornell.edu
*
* This file was added by Harri Porten <porten@tu-harburg.de>
*
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this program; if not, write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <errno.h>
#include <stdlib.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <setjmp.h>
#include <tqregexp.h>
#include <assert.h>
#include "modem.h"
#include "pppdata.h"
#include "requester.h"
#include <klocale.h>
#include <kdebug.h>
#include <kcmdlineargs.h>
#include <config.h>
static sigjmp_buf jmp_buffer;
Modem *Modem::modem = 0;
Modem::Modem() :
modemfd(-1),
sn(0L),
data_mode(false),
modem_is_locked(false)
{
assert(modem==0);
modem = this;
args = TDECmdLineArgs::parsedArgs();
}
Modem::~Modem() {
modem = 0;
}
speed_t Modem::modemspeed() {
// convert the string modem speed int the gpppdata object to a t_speed type
// to set the modem. The constants here should all be ifdef'd because
// other systems may not have them
int i = gpppdata.speed().toInt()/100;
switch(i) {
case 24:
return B2400;
break;
case 96:
return B9600;
break;
case 192:
return B19200;
break;
case 384:
return B38400;
break;
#ifdef B57600
case 576:
return B57600;
break;
#endif
#ifdef B115200
case 1152:
return B115200;
break;
#endif
#ifdef B230400
case 2304:
return B230400;
break;
#endif
#ifdef B460800
case 4608:
return B460800;
break;
#endif
#ifdef B921600
case 9216:
return B921600;
break;
#endif
default:
return B38400;
break;
}
}
bool Modem::opentty() {
// int flags;
TQString device = "";
if (args->isSet("dev"))
device = args->getOption("dev");
else
device = gpppdata.modemDevice();
kdDebug() << "Opening Device: " << device << endl;
if((modemfd = Requester::rq->openModem(device))<0) {
errmsg = i18n("Unable to open modem.");
return false;
}
#if 0
if(gpppdata.UseCDLine()) {
if(ioctl(modemfd, TIOCMGET, &flags) == -1) {
errmsg = i18n("Unable to detect state of CD line.");
::close(modemfd);
modemfd = -1;
return false;
}
if ((flags&TIOCM_CD) == 0) {
errmsg = i18n("The modem is not ready.");
::close(modemfd);
modemfd = -1;
return false;
}
}
#endif
tcdrain (modemfd);
tcflush (modemfd, TCIOFLUSH);
if(tcgetattr(modemfd, &tty) < 0){
// this helps in some cases
tcsendbreak(modemfd, 0);
sleep(1);
if(tcgetattr(modemfd, &tty) < 0){
errmsg = i18n("The modem is busy.");
::close(modemfd);
modemfd = -1;
return false;
}
}
memset(&initial_tty,'\0',sizeof(initial_tty));
initial_tty = tty;
tty.c_cc[VMIN] = 0; // nonblocking
tty.c_cc[VTIME] = 0;
tty.c_oflag = 0;
tty.c_lflag = 0;
tty.c_cflag &= ~(CSIZE | CSTOPB | PARENB);
tty.c_cflag |= CS8 | CREAD;
tty.c_cflag |= CLOCAL; // ignore modem status lines
tty.c_iflag = IGNBRK | IGNPAR /* | ISTRIP */ ;
tty.c_lflag &= ~ICANON; // non-canonical mode
tty.c_lflag &= ~(ECHO|ECHOE|ECHOK|ECHOKE);
// the english/i18n mix below is ugly but we want to keep working
// after someone changed the code to use i18n'ed config values
TQString flowCtrl = gpppdata.flowcontrol();
if(flowCtrl != "None" && flowCtrl != i18n("None")) {
if(flowCtrl == "CRTSCTS" || flowCtrl == i18n("Hardware [CRTSCTS]")) {
tty.c_cflag |= CRTSCTS;
}
else {
tty.c_iflag |= IXON | IXOFF;
tty.c_cc[VSTOP] = 0x13; /* DC3 = XOFF = ^S */
tty.c_cc[VSTART] = 0x11; /* DC1 = XON = ^Q */
}
}
else {
tty.c_cflag &= ~CRTSCTS;
tty.c_iflag &= ~(IXON | IXOFF);
}
cfsetospeed(&tty, modemspeed());
cfsetispeed(&tty, modemspeed());
tcdrain(modemfd);
if(tcsetattr(modemfd, TCSANOW, &tty) < 0){
errmsg = i18n("The modem is busy.");
::close(modemfd);
modemfd=-1;
return false;
}
errmsg = i18n("Modem Ready.");
return true;
}
bool Modem::closetty() {
if(modemfd >=0 ) {
stop();
/* discard data not read or transmitted */
tcflush(modemfd, TCIOFLUSH);
if(tcsetattr(modemfd, TCSANOW, &initial_tty) < 0){
errmsg = i18n("Can't restore tty settings: tcsetattr()\n");
::close(modemfd);
modemfd = -1;
return false;
}
::close(modemfd);
modemfd = -1;
}
return true;
}
void Modem::readtty(int) {
char buffer[200];
unsigned char c;
int len;
// read data in chunks of up to 200 bytes
if((len = ::read(modemfd, buffer, 200)) > 0) {
// split buffer into single characters for further processing
for(int i = 0; i < len; i++) {
c = buffer[i] & 0x7F;
emit charWaiting(c);
}
}
}
void Modem::notify(const TQObject *receiver, const char *member) {
connect(this, TQT_SIGNAL(charWaiting(unsigned char)), receiver, member);
startNotifier();
}
void Modem::stop() {
disconnect(TQT_SIGNAL(charWaiting(unsigned char)));
stopNotifier();
}
void Modem::startNotifier() {
if(modemfd >= 0) {
if(sn == 0) {
sn = new TQSocketNotifier(modemfd, TQSocketNotifier::Read, this);
connect(sn, TQT_SIGNAL(activated(int)), TQT_SLOT(readtty(int)));
kdDebug(5002) << "TQSocketNotifier started!" << endl;
} else {
// Debug("TQSocketNotifier re-enabled!");
sn->setEnabled(true);
}
}
}
void Modem::stopNotifier() {
if(sn != 0) {
sn->setEnabled(false);
disconnect(sn);
delete sn;
sn = 0;
kdDebug(5002) << "TQSocketNotifier stopped!" << endl;
}
}
void Modem::flush() {
char c;
while(read(modemfd, &c, 1) == 1);
}
bool Modem::writeChar(unsigned char c) {
int s;
do {
s = write(modemfd, &c, 1);
if (s < 0) {
kdError(5002) << "write() in Modem::writeChar failed" << endl;
return false;
}
} while(s == 0);
return true;
}
bool Modem::writeLine(const char *buf) {
int len = strlen(buf);
char *b = new char[len+2];
memcpy(b, buf, len);
// different modems seem to need different line terminations
TQString term = gpppdata.enter();
if(term == "LF")
b[len++]='\n';
else if(term == "CR")
b[len++]='\r';
else if(term == "CR/LF") {
b[len++]='\r';
b[len++]='\n';
}
int l = len;
while(l) {
int wr = write(modemfd, &b[len-l], l);
if(wr < 0) {
if (errno == EAGAIN)
continue;
// TODO do something meaningful with the error code (or ignore it
kdError(5002) << "write() in Modem::writeLine failed" << endl;
delete[] b;
return false;
}
l -= wr;
}
delete[] b;
return true;
}
bool Modem::hangup() {
// this should really get the modem to hang up and go into command mode
// If anyone sees a fault in the following please let me know, since
// this is probably the most imporant snippet of code in the whole of
// kppp. If people complain about kppp being stuck, this piece of code
// is most likely the reason.
struct termios temptty;
if(modemfd >= 0) {
// is this Escape & HangupStr stuff really necessary ? (Harri)
if (data_mode) escape_to_command_mode();
// Then hangup command
writeLine(gpppdata.modemHangupStr().local8Bit());
usleep(gpppdata.modemInitDelay() * 10000); // 0.01 - 3.0 sec
#ifndef DEBUG_WO_DIALING
if (sigsetjmp(jmp_buffer, 1) == 0) {
// set alarm in case tcsendbreak() hangs
signal(SIGALRM, alarm_handler);
alarm(2);
tcsendbreak(modemfd, 0);
alarm(0);
signal(SIGALRM, SIG_IGN);
} else {
kdWarning(5002) << "Modem did not respond properly." << endl;
#if 0 // observed false alarms with some modems
// we reach this point if the alarm handler got called
closetty();
close(modemfd);
modemfd = -1;
errmsg = i18n("The modem does not respond.");
return false;
#endif
}
#ifndef __svr4__ // drops DTR but doesn't set it afterwards again. not good for init.
tcgetattr(modemfd, &temptty);
cfsetospeed(&temptty, B0);
cfsetispeed(&temptty, B0);
tcsetattr(modemfd, TCSAFLUSH, &temptty);
#else
int modemstat;
ioctl(modemfd, TIOCMGET, &modemstat);
modemstat &= ~TIOCM_DTR;
ioctl(modemfd, TIOCMSET, &modemstat);
ioctl(modemfd, TIOCMGET, &modemstat);
modemstat |= TIOCM_DTR;
ioctl(modemfd, TIOCMSET, &modemstat);
#endif
usleep(gpppdata.modemInitDelay() * 10000); // 0.01 - 3.0 secs
cfsetospeed(&temptty, modemspeed());
cfsetispeed(&temptty, modemspeed());
tcsetattr(modemfd, TCSAFLUSH, &temptty);
#endif
return true;
} else
return false;
}
void Modem::escape_to_command_mode() {
// Send Properly bracketed escape code to put the modem back into command state.
// A modem will accept AT commands only when it is in command state.
// When a modem sends the host the CONNECT string, that signals
// that the modem is now in the connect state (no long accepts AT commands.)
// Need to send properly timed escape sequence to put modem in command state.
// Escape codes and guard times are controlled by S2 and S12 values.
//
tcflush(modemfd, TCIOFLUSH);
// +3 because quiet time must be greater than guard time.
usleep((gpppdata.modemEscapeGuardTime()+3)*20000);
TQCString tmp = gpppdata.modemEscapeStr().local8Bit();
write(modemfd, tmp.data(), tmp.length());
tcflush(modemfd, TCIOFLUSH);
usleep((gpppdata.modemEscapeGuardTime()+3)*20000);
data_mode = false;
}
const TQString Modem::modemMessage() {
return errmsg;
}
TQString Modem::parseModemSpeed(const TQString &s) {
// this is a small (and bad) parser for modem speeds
int rx = -1;
int tx = -1;
int i;
TQString result;
kdDebug(5002) << "Modem reported result string: " << s << endl;
const int RXMAX = 7;
const int TXMAX = 2;
TQRegExp rrx[RXMAX] = {
TQRegExp("[0-9]+[:/ ]RX", false),
TQRegExp("[0-9]+RX", false),
TQRegExp("[/: -][0-9]+[/: ]", false),
TQRegExp("[/: -][0-9]+$", false),
TQRegExp("CARRIER [^0-9]*[0-9]+", false),
TQRegExp("CONNECT [^0-9]*[0-9]+", false),
TQRegExp("[0-9]+") // panic mode
};
TQRegExp trx[TXMAX] = {
TQRegExp("[0-9]+[:/ ]TX", false),
TQRegExp("[0-9]+TX", false)
};
for(i = 0; i < RXMAX; i++) {
int len, idx, result;
if((idx = rrx[i].search(s)) > -1) {
len = rrx[i].matchedLength();
//
// rrx[i] has been matched, idx contains the start of the match
// and len contains how long the match is. Extract the match.
//
TQString sub = s.mid(idx, len);
//
// Now extract the digits only from the match, which will
// then be converted to an int.
//
if ((idx = rrx[RXMAX-1].search( sub )) > -1) {
len = rrx[RXMAX-1].matchedLength();
sub = sub.mid(idx, len);
result = sub.toInt();
if(result > 0) {
rx = result;
break;
}
}
}
}
for(i = 0; i < TXMAX; i++) {
int len, idx, result;
if((idx = trx[i].search(s)) > -1) {
len = trx[i].matchedLength();
//
// trx[i] has been matched, idx contains the start of the match
// and len contains how long the match is. Extract the match.
//
TQString sub = s.mid(idx, len);
//
// Now extract the digits only from the match, which will then
// be converted to an int.
//
if((idx = rrx[RXMAX-1].search(sub)) > -1) {
len = rrx[RXMAX-1].matchedLength();
sub = sub.mid(idx, len);
result = sub.toInt();
if(result > 0) {
tx = result;
break;
}
}
}
}
if(rx == -1 && tx == -1)
result = i18n("Unknown speed");
else if(tx == -1)
result.setNum(rx);
else if(rx == -1) // should not happen
result.setNum(tx);
else
result.sprintf("%d/%d", rx, tx);
kdDebug(5002) << "The parsed result is: " << result << endl;
return result;
}
// Lock modem device. Returns 0 on success 1 if the modem is locked and -1 if
// a lock file can't be created ( permission problem )
int Modem::lockdevice() {
int fd;
char newlock[80]=""; // safe
if(!gpppdata.modemLockFile()) {
kdDebug(5002) << "The user doesn't want a lockfile." << endl;
return 0;
}
if (modem_is_locked)
return 1;
TQString device = "";
if (args->isSet("dev"))
device = args->getOption("dev");
else
device = gpppdata.modemDevice();
TQString lockfile = LOCK_DIR"/LCK..";
lockfile += device.mid(5); // append everything after /dev/
if(access(TQFile::encodeName(lockfile), F_OK) == 0) {
if ((fd = Requester::rq->openLockfile(TQFile::encodeName(lockfile), O_RDONLY)) >= 0) {
// Mario: it's not necessary to read more than lets say 32 bytes. If
// file has more than 32 bytes, skip the rest
char oldlock[33]; // safe
int sz = read(fd, &oldlock, 32);
close (fd);
if (sz <= 0)
return 1;
oldlock[sz] = '\0';
kdDebug(5002) << "Device is locked by: " << &oldlock << endl;
int oldpid;
int match = sscanf(oldlock, "%d", &oldpid);
// found a pid in lockfile ?
if (match < 1 || oldpid <= 0)
return 1;
// check if process exists
if (kill((pid_t)oldpid, 0) == 0 || errno != ESRCH)
return 1;
kdDebug(5002) << "lockfile is stale" << endl;
}
}
fd = Requester::rq->openLockfile(device,
O_WRONLY|O_TRUNC|O_CREAT);
if(fd >= 0) {
sprintf(newlock,"%010d\n", getpid());
kdDebug(5002) << "Locking Device: " << newlock << endl;
write(fd, newlock, strlen(newlock));
close(fd);
modem_is_locked=true;
return 0;
}
return -1;
}
// UnLock modem device
void Modem::unlockdevice() {
if (modem_is_locked) {
kdDebug(5002) << "UnLocking Modem Device" << endl;
Requester::rq->removeLockfile();
modem_is_locked=false;
}
}
void alarm_handler(int) {
// fprintf(stderr, "alarm_handler(): Received SIGALRM\n");
// jump
siglongjmp(jmp_buffer, 1);
}
#include "modem.moc"