/***************************************************************************
                                kinetd.cpp
                              --------------
    begin                : Mon Feb 11 2002
    copyright            : (C) 2002 by Tim Jansen
    email                : tim@tjansen.de
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

#include "kinetd.h"
#include "kinetd.moc"
#include "kinetinterface.h"
#include "kuser.h"
#include "uuid.h"
#include <tqregexp.h>
#include <kservicetype.h>
#include <kdebug.h>
#include <kstandarddirs.h>
#include <tdeconfig.h>
#include <knotifyclient.h>
#include <ksockaddr.h>
#include <kextsock.h>
#include <tdelocale.h>
#include <tdeglobal.h>

#include <unistd.h>
#include <fcntl.h>

PortListener::PortListener(KService::Ptr s,
			   TDEConfig *config,
			   KServiceRegistry *srvreg) :
	m_port(-1),
	m_serviceRegistered(false),
	m_socket(0),
	m_config(config),
	m_srvreg(srvreg),
	m_dnssdreg(0)
{
	m_dnssdRegistered = false;

	m_uuid = createUUID();
	loadConfig(s);

	if (m_valid && m_enabled)
		acquirePort();
}

bool PortListener::acquirePort() {
	if (m_socket) {
		if ((m_port >= m_portBase) &&
		    (m_port < (m_portBase + m_autoPortRange)))
			return true;
		else
			delete m_socket;
	}
	m_port = m_portBase;
	m_socket = new TDEServerSocket(m_port, false);
	while (!m_socket->bindAndListen(true)) {
		m_port++;
		if (m_port >= (m_portBase+m_autoPortRange)) {
			kdDebug() << "Kinetd cannot load service "<<m_serviceName
				  <<": unable to get port" << endl;
			m_port = -1;
			delete m_socket;
			m_socket = 0;
			return false;
		}
		delete m_socket;
		m_socket = new TDEServerSocket(m_port, false);
	}
	connect(m_socket, TQT_SIGNAL(accepted(TDESocket*)),
		TQT_SLOT(accepted(TDESocket*)));

	bool s = m_registerService;
	bool sd =m_dnssdRegister;
	setServiceRegistrationEnabledInternal(false);
	dnssdRegister(false);
	setServiceRegistrationEnabledInternal(s);
	dnssdRegister(sd);
	return true;
}

void PortListener::freePort() {
	m_port = -1;
	if (m_socket)
		delete m_socket;
	m_socket = 0;
	setServiceRegistrationEnabledInternal(m_registerService);
	dnssdRegister(false);
}

void PortListener::loadConfig(KService::Ptr s) {
	m_valid = true;
	m_autoPortRange = 0;
	m_enabled = true;
	m_argument = TQString();
	m_multiInstance = false;

	TQVariant vid, vport, vautoport, venabled, vargument, vmultiInstance, vurl,
	  vsattributes, vslifetime, vdname, vdtype, vddata;

	m_execPath = s->exec().utf8();
	vid = s->property("X-TDE-KINETD-id");
	vport = s->property("X-TDE-KINETD-port");
	vautoport = s->property("X-TDE-KINETD-autoPortRange");
	venabled = s->property("X-TDE-KINETD-enabled");
	vargument = s->property("X-TDE-KINETD-argument");
	vmultiInstance = s->property("X-TDE-KINETD-multiInstance");
	vurl = s->property("X-TDE-KINETD-serviceURL");
	vsattributes = s->property("X-TDE-KINETD-serviceAttributes");
	vslifetime = s->property("X-TDE-KINETD-serviceLifetime");
	vdname = s->property("X-TDE-KINETD-DNSSD-Name");
	vdtype = s->property("X-TDE-KINETD-DNSSD-Type");
	vddata = s->property("X-TDE-KINETD-DNSSD-Properties");

	if (!vid.isValid()) {
		kdDebug() << "Kinetd cannot load service "<<m_serviceName
			  <<": no id set" << endl;
		m_valid = false;
		return;
	}

	if (!vport.isValid()) {
		kdDebug() << "Kinetd cannot load service "<<m_serviceName
			  <<": invalid port" << endl;
		m_valid = false;
		return;
	}

	m_serviceName = vid.toString();
	m_serviceLifetime = vslifetime.toInt();
	if (m_serviceLifetime < 120) // never less than 120 s
		m_serviceLifetime = 120;
	m_portBase = vport.toInt();
	if (vautoport.isValid())
		m_autoPortRange = vautoport.toInt();
	if (venabled.isValid())
		m_enabled = venabled.toBool();
	if (vargument.isValid())
		m_argument = vargument.toString();
	if (vmultiInstance.isValid())
		m_multiInstance = vmultiInstance.toBool();
	if (vurl.isValid()) {
		m_serviceURL = vurl.toString();
		m_registerService = true;
	}
	else {
		m_serviceURL = TQString();
		m_registerService = false;
	}
	if (vsattributes.isValid()) {
		m_serviceAttributes = vsattributes.toString();
	}
	else
		m_serviceAttributes = "";
	if (vddata.isValid()) {
		TQStringList attrs = vddata.toStringList();
		for (TQStringList::iterator it=attrs.begin();
		it!=attrs.end();it++) {
		    TQString key = (*it).section('=',0,0);
		    TQString value =  processServiceTemplate((*it).section('=',1))[0];
		    if (!key.isEmpty()) m_dnssdData[key]=value;
		    }
	}
	if (vdname.isValid() && vdtype.isValid()) {
		m_dnssdName = processServiceTemplate(vdname.toString())[0];
		m_dnssdType = vdtype.toString();
		m_dnssdRegister = true;
		kdDebug() << "DNS-SD register is enabled\n";
	}
	else 
	        m_dnssdRegister = false;
		

	m_slpLifetimeEnd = TQDateTime::currentDateTime().addSecs(m_serviceLifetime);
	m_defaultPortBase = m_portBase;
	m_defaultAutoPortRange = m_autoPortRange;

	m_config->setGroup("ListenerConfig");
	m_enabled = m_config->readBoolEntry("enabled_" + m_serviceName,
					    m_enabled);
	m_portBase = m_config->readNumEntry("port_base_" + m_serviceName,
					    m_portBase);
	m_autoPortRange = m_config->readNumEntry("auto_port_range_" + m_serviceName,
						 m_autoPortRange);
	TQDateTime nullTime;
	m_expirationTime = m_config->readDateTimeEntry("enabled_expiration_"+m_serviceName,
						     &nullTime);
	if ((!m_expirationTime.isNull()) && (m_expirationTime < TQDateTime::currentDateTime()))
		m_enabled = false;
	m_registerService = m_config->readBoolEntry("enabled_srvreg_"+m_serviceName,
						     m_registerService);
}

void PortListener::accepted(TDESocket *sock) {
	TQString host, port;
	TDESocketAddress *ksa = KExtendedSocket::peerAddress(sock->socket());
	if ((!ksa) || !ksa->address()) {
		delete sock;
		return;
	}
	KExtendedSocket::resolve(ksa, host, port);
	KNotifyClient::event("IncomingConnection",
		i18n("Connection from %1").arg(host));
	delete ksa;

	if ((!m_enabled) ||
	   ((!m_multiInstance) && m_process.isRunning())) {
		delete sock;
		return;
	}

	// disable CLOEXEC flag, fixes #77412
	fcntl(sock->socket(), F_SETFD, fcntl(sock->socket(), F_GETFD) & ~FD_CLOEXEC);

	m_process.clearArguments();
	m_process << m_execPath << m_argument << TQString::number(sock->socket());
	if (!m_process.start(TDEProcess::DontCare)) {
		KNotifyClient::event("ProcessFailed",
			i18n("Call \"%1 %2 %3\" failed").arg(m_execPath)
				.arg(m_argument)
				.arg(sock->socket()));
	}

	delete sock;
}

bool PortListener::isValid() {
	return m_valid;
}

bool PortListener::isEnabled() {
	return m_enabled && m_valid;
}

int PortListener::port() {
	return m_port;
}

TQStringList PortListener::processServiceTemplate(const TQString &a) {
	TQStringList l;
	TQValueVector<KInetInterface> v = KInetInterface::getAllInterfaces(false);
	TQValueVector<KInetInterface>::Iterator it = v.begin();
	while (it != v.end()) {
		KInetSocketAddress *address = (*(it++)).address();
		if (!address)
			continue;
		TQString hostName = address->nodeName();
		KUser u;
		TQString x = a; // replace does not work in const TQString. Why??
		l.append(x.replace(TQRegExp("%h"), KServiceRegistry::encodeAttributeValue(hostName))
			 .replace(TQRegExp("%p"), TQString::number(m_port))
			 .replace(TQRegExp("%u"), KServiceRegistry::encodeAttributeValue(u.loginName()))
			 .replace(TQRegExp("%i"), KServiceRegistry::encodeAttributeValue(m_uuid))
			 .replace(TQRegExp("%f"), KServiceRegistry::encodeAttributeValue(u.fullName())));
	}
	return l;
}

bool PortListener::setPort(int port, int autoPortRange) {
	if ((port == m_portBase) && (autoPortRange == m_autoPortRange))
		return (m_port != -1);

	m_config->setGroup("ListenerConfig");
	if (port > 0) {
		m_portBase = port;
		m_autoPortRange = autoPortRange;

		m_config->writeEntry("port_base_" + m_serviceName, m_portBase);
		m_config->writeEntry("auto_port_range_"+m_serviceName, m_autoPortRange);
	}
	else {
		m_portBase = m_defaultPortBase;
		m_autoPortRange = m_defaultAutoPortRange;

		m_config->deleteEntry("port_base_" + m_serviceName);
		m_config->deleteEntry("auto_port_range_"+m_serviceName);
	}

	m_config->sync();
	if (m_enabled)
		return acquirePort();
	else
		return false;
}

void PortListener::setEnabled(bool e) {
	setEnabledInternal(e, TQDateTime());
}

void PortListener::setEnabledInternal(bool e, const TQDateTime &ex) {
	m_config->setGroup("ListenerConfig");
	m_config->writeEntry("enabled_" + m_serviceName, e);
	m_config->writeEntry("enabled_expiration_"+m_serviceName, ex);
	m_config->sync();

	m_expirationTime = ex;

	if (e) {
		if (m_port < 0)
			acquirePort();
		m_enabled = m_port >= 0;

	}
	else {
		freePort();
		m_enabled = false;
	}
}

void PortListener::setEnabled(const TQDateTime &ex) {
	setEnabledInternal(true, ex);
}

bool PortListener::isServiceRegistrationEnabled() {
	return m_registerService;
}

void PortListener::setServiceRegistrationEnabled(bool e) {
	setServiceRegistrationEnabledInternal(e);
	dnssdRegister(e && m_enabled);
	m_config->setGroup("ListenerConfig");
	m_config->writeEntry("enable_srvreg_" + m_serviceName, e);
	m_config->sync();
}

void PortListener::setServiceRegistrationEnabledInternal(bool e) {
	m_registerService = e;

	if ((!m_srvreg) || m_serviceURL.isNull())
		return;
	if (m_serviceRegistered == (m_enabled && e))
		return;

        if (m_enabled && e) {
		m_registeredServiceURLs = processServiceTemplate(m_serviceURL);
		TQStringList attributes = processServiceTemplate(m_serviceAttributes);
		TQStringList::Iterator it = m_registeredServiceURLs.begin();
		TQStringList::Iterator it2 = attributes.begin();
		while ((it != m_registeredServiceURLs.end()) &&
		       (it2 != attributes.end())) {
			 if (!m_srvreg->registerService(
				     *(it++),
				     *(it2++),
				     m_serviceLifetime))
				 kdDebug(7021) << "Failure registering SLP service (no slpd running?)"<< endl;
		}
		m_serviceRegistered = true;
		// make lifetime 30s shorter, because the timeout is not precise
		m_slpLifetimeEnd = TQDateTime::currentDateTime().addSecs(m_serviceLifetime-30);
	} else {
		TQStringList::Iterator it = m_registeredServiceURLs.begin();
		while (it != m_registeredServiceURLs.end())
			m_srvreg->unregisterService(*(it++));
		m_serviceRegistered = false;
	}
}

void PortListener::dnssdRegister(bool e) {
	if (m_dnssdName.isNull() || m_dnssdType.isNull())
		return;
	if (m_dnssdRegistered ==  e)
		return;
	if (e) {
		m_dnssdRegistered=true;
		m_dnssdreg = new DNSSD::PublicService(m_dnssdName,m_dnssdType,m_port);
		m_dnssdreg->setTextData(m_dnssdData);
		m_dnssdreg->publishAsync();
	} else {
		m_dnssdRegistered=false;
		delete m_dnssdreg;
		m_dnssdreg=0;
	}
}

void PortListener::refreshRegistration() {
	if (m_serviceRegistered && (m_slpLifetimeEnd.addSecs(-90) < TQDateTime::currentDateTime())) {
		setServiceRegistrationEnabledInternal(false);
		setServiceRegistrationEnabledInternal(true);
	}
}

TQDateTime PortListener::expiration() {
	return m_expirationTime;
}

TQDateTime PortListener::serviceLifetimeEnd() {
	if (m_serviceRegistered)
		return m_slpLifetimeEnd;
	else
		return TQDateTime();
}

TQString PortListener::name() {
	return m_serviceName;
}

PortListener::~PortListener() {
	setServiceRegistrationEnabledInternal(false);
	delete m_socket;
}


KInetD::KInetD(TQCString &n) :
	KDEDModule(n)
{
	m_config = new TDEConfig("kinetdrc");
	m_srvreg = new KServiceRegistry();
	if (!m_srvreg->available()) {
		kdDebug(7021) << "SLP not available"<< endl;
		delete m_srvreg;
		m_srvreg = 0;
	}
	m_portListeners.setAutoDelete(true);
	connect(&m_expirationTimer, TQT_SIGNAL(timeout()), TQT_SLOT(setExpirationTimer()));
	connect(&m_portRetryTimer, TQT_SIGNAL(timeout()), TQT_SLOT(portRetryTimer()));
	connect(&m_reregistrationTimer, TQT_SIGNAL(timeout()), TQT_SLOT(reregistrationTimer()));
	loadServiceList();
}

void KInetD::loadServiceList()
{
	m_portListeners.clear();


	KService::List kinetdModules =
		KServiceType::offers("KInetDModule");
	for(KService::List::ConstIterator it = kinetdModules.begin();
		it != kinetdModules.end();
		it++) {
		KService::Ptr s = *it;
		PortListener *pl = new PortListener(s, m_config, m_srvreg);
		if (pl->isValid())
			m_portListeners.append(pl);
		else
			delete pl;
	}

	setExpirationTimer();
	setPortRetryTimer(true);
	setReregistrationTimer();
}

void KInetD::expirationTimer() {
	setExpirationTimer();
	setReregistrationTimer();
}

void KInetD::setExpirationTimer() {
	TQDateTime nextEx = getNextExpirationTime(); // disables expired portlistener!
	if (!nextEx.isNull())
		m_expirationTimer.start(TQDateTime::currentDateTime().secsTo(nextEx)*1000 + 30000,
			false);
	else
		m_expirationTimer.stop();
}

void KInetD::portRetryTimer() {
	setPortRetryTimer(true);
	setReregistrationTimer();
}

void KInetD::setReregistrationTimer() {
	TQDateTime d;
	PortListener *pl = m_portListeners.first();
	while (pl) {
		TQDateTime d2 = pl->serviceLifetimeEnd();
		if (!d2.isNull()) {
			if (d2 < TQDateTime::currentDateTime()) {
				m_reregistrationTimer.start(0, true);
				return;
			}
			else if (d.isNull() || (d2 < d))
				d = d2;
		}
		pl = m_portListeners.next();
	}

	if (!d.isNull()) {
		int s = TQDateTime::currentDateTime().secsTo(d);
		if (s < 30)
			s = 30; // max frequency 30s
		m_reregistrationTimer.start(s*1000, true);
	}
	else
		m_reregistrationTimer.stop();
}

void KInetD::reregistrationTimer() {
	PortListener *pl = m_portListeners.first();
	while (pl) {
		pl->refreshRegistration();
		pl = m_portListeners.next();
	}
	setReregistrationTimer();
}

void KInetD::setPortRetryTimer(bool retry) {
	int unmappedPorts = 0;

	PortListener *pl = m_portListeners.first();
	while (pl) {
		if (pl->isEnabled() && (pl->port() < 0))
			if (retry) {
				if (!pl->acquirePort())
					unmappedPorts++;
			}
			else if (pl->port() < 0)
				unmappedPorts++;
		pl = m_portListeners.next();
	}

	if (unmappedPorts > 0)
		m_portRetryTimer.start(30000, false);
	else
		m_portRetryTimer.stop();
}

PortListener *KInetD::getListenerByName(TQString name)
{
	PortListener *pl = m_portListeners.first();
	while (pl) {
		if (pl->name() == name)
			return pl;
		pl = m_portListeners.next();
	}
	return pl;
}

// gets next expiration timer, SIDEEFFECT: disables expired portlisteners while doing this
TQDateTime KInetD::getNextExpirationTime()
{
	PortListener *pl = m_portListeners.first();
	TQDateTime d;
	while (pl) {
		TQDateTime d2 = pl->expiration();
		if (!d2.isNull()) {
			if (d2 < TQDateTime::currentDateTime())
				pl->setEnabled(false);
			else if (d.isNull() || (d2 < d))
				d = d2;
		}
		pl = m_portListeners.next();
	}
	return d;
}

TQStringList KInetD::services()
{
	TQStringList list;
	PortListener *pl = m_portListeners.first();
	while (pl) {
		list.append(pl->name());
		pl = m_portListeners.next();
	}
	return list;
}

bool KInetD::isEnabled(TQString service)
{
	PortListener *pl = getListenerByName(service);
	if (!pl)
		return false;

	return pl->isEnabled();
}

int KInetD::port(TQString service)
{
	PortListener *pl = getListenerByName(service);
	if (!pl)
		return -1;

	return pl->port();
}

bool KInetD::setPort(TQString service, int port, int autoPortRange)
{
	PortListener *pl = getListenerByName(service);
	if (!pl)
		return false;

	bool s = pl->setPort(port, autoPortRange);
	setPortRetryTimer(false);
	setReregistrationTimer();
	return s;
}

bool KInetD::isInstalled(TQString service)
{
	PortListener *pl = getListenerByName(service);
	return (pl != 0);
}

void KInetD::setEnabled(TQString service, bool enable)
{
	PortListener *pl = getListenerByName(service);
	if (!pl)
		return;

	pl->setEnabled(enable);
	setExpirationTimer();
	setReregistrationTimer();
}

void KInetD::setEnabled(TQString service, TQDateTime expiration)
{
	PortListener *pl = getListenerByName(service);
	if (!pl)
		return;

	pl->setEnabled(expiration);
	setExpirationTimer();
	setReregistrationTimer();
}

void KInetD::setServiceRegistrationEnabled(TQString service, bool enable)
{
	PortListener *pl = getListenerByName(service);
	if (!pl)
		return;

	pl->setServiceRegistrationEnabled(enable);
	setReregistrationTimer();
}

bool KInetD::isServiceRegistrationEnabled(TQString service)
{
	PortListener *pl = getListenerByName(service);
	if (!pl)
		return false;

	return pl->isServiceRegistrationEnabled();
}

KInetD::~KInetD() {
	m_portListeners.clear();
	delete m_config;
	if (m_srvreg)
		delete m_srvreg;
}

extern "C" {
	KDE_EXPORT KDEDModule *create_kinetd(TQCString &name)
	{
        TDEGlobal::locale()->insertCatalogue("kinetd");
		return new KInetD(name);
	}
}