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/****************************************************************************
* Copyright (c) 2009 Markus Alexander Kuppe.
*
* This program and the accompanying materials are made
* available under the terms of the Eclipse Public License 2.0
* which is available at https://www.eclipse.org/legal/epl-2.0/
*
* Contributors:
* Markus Alexander Kuppe (ecf-dev_eclipse.org <at> lemmster <dot> de) - initial API and implementation
*
* SPDX-License-Identifier: EPL-2.0
*****************************************************************************/
package org.eclipse.ecf.provider.dnssd;
import java.net.URI;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Properties;
import org.eclipse.core.runtime.Assert;
import org.eclipse.ecf.core.ContainerConnectException;
import org.eclipse.ecf.core.events.ContainerConnectedEvent;
import org.eclipse.ecf.core.events.ContainerConnectingEvent;
import org.eclipse.ecf.core.identity.ID;
import org.eclipse.ecf.core.identity.IDCreateException;
import org.eclipse.ecf.core.identity.IDFactory;
import org.eclipse.ecf.core.identity.Namespace;
import org.eclipse.ecf.core.security.IConnectContext;
import org.eclipse.ecf.discovery.DiscoveryContainerConfig;
import org.eclipse.ecf.discovery.IServiceInfo;
import org.eclipse.ecf.discovery.ServiceInfo;
import org.eclipse.ecf.discovery.ServiceProperties;
import org.eclipse.ecf.discovery.identity.IServiceID;
import org.eclipse.ecf.discovery.identity.IServiceTypeID;
import org.xbill.DNS.Lookup;
import org.xbill.DNS.Name;
import org.xbill.DNS.PTRRecord;
import org.xbill.DNS.Record;
import org.xbill.DNS.ResolverConfig;
import org.xbill.DNS.SRVRecord;
import org.xbill.DNS.SimpleResolver;
import org.xbill.DNS.TXTRecord;
import org.xbill.DNS.Type;
/**
* @author markus
*
*/
public class DnsSdDiscoveryLocator extends DnsSdDiscoveryContainerAdapter {
private static final String DNS_SD_PATH = "path"; //$NON-NLS-1$
private static final String DNS_SD_PTCL = "dns-sd.ptcl"; //$NON-NLS-1$
public DnsSdDiscoveryLocator() {
super(DnsSdNamespace.NAME, new DiscoveryContainerConfig(IDFactory
.getDefault().createStringID(
DnsSdDiscoveryLocator.class.getName())));
}
/*
* (non-Javadoc)
*
* @see
* org.eclipse.ecf.discovery.IDiscoveryLocator#getServiceInfo(org.eclipse
* .ecf.discovery.identity.IServiceID)
*/
public IServiceInfo getServiceInfo(IServiceID aServiceId) {
Assert.isNotNull(aServiceId);
IServiceInfo[] services = getServices(aServiceId.getServiceTypeID());
for (int i = 0; i < services.length; i++) {
//TODO This can be a lot faster if done directly instead of via org.eclipse.ecf.provider.dnssrv.DnsSrvDisocoveryLocator.getServices(IServiceTypeID)
IServiceInfo iServiceInfo = services[i];
if(iServiceInfo.getServiceID().equals(aServiceId)) {
return iServiceInfo;
}
}
return null;
}
/**
* This always returns the service type found for our local domain
* Use org.eclipse.ecf.provider.dnssrv.DnsSrvDisocoveryLocator.getServices(IServiceTypeID) with a wildcard query instead.
*
* @see org.eclipse.ecf.discovery.IDiscoveryLocator#getServiceTypes()
*/
public IServiceTypeID[] getServiceTypes() {
// technically can't do anything without a scope (domain) -> falling back to local domain (mDNS?)
DnsSdServiceTypeID serviceTypeId = (DnsSdServiceTypeID) targetID;
return getServiceTypes(serviceTypeId);
}
private IServiceTypeID[] getServiceTypes(final DnsSdServiceTypeID serviceTypeId) {
List result = new ArrayList();
Record[] queryResult = getRecords(serviceTypeId);
for (int j = 0; j < queryResult.length; j++) {
Record record = queryResult[j];
if(record instanceof PTRRecord) {
PTRRecord ptrRecord = (PTRRecord) record;
result.add(new DnsSdServiceTypeID(getServicesNamespace(), ptrRecord.getTarget()));
} else if (record instanceof SRVRecord) {
SRVRecord srvRecord = (SRVRecord) record;
result.add(new DnsSdServiceTypeID(getServicesNamespace(), srvRecord.getName()));
}
}
return (IServiceTypeID[]) result.toArray(new IServiceTypeID[result.size()]);
}
/*
* (non-Javadoc)
*
* @see org.eclipse.ecf.discovery.IDiscoveryLocator#getServices()
*/
public IServiceInfo[] getServices() {
// technically can't do anything without a scope (domain) -> falling back to local domain (mDNS?)
return getServices(targetID);
}
/*
* (non-Javadoc)
*
* @see
* org.eclipse.ecf.discovery.IDiscoveryLocator#getServices(org.eclipse.ecf
* .discovery.identity.IServiceTypeID)
*/
public IServiceInfo[] getServices(IServiceTypeID aServiceTypeId) {
Assert.isNotNull(aServiceTypeId);
DnsSdServiceTypeID serviceTypeId = (DnsSdServiceTypeID) aServiceTypeId;
Collection srvRecords = getSRVRecords(serviceTypeId.getInternalQueries());
List serviceInfos = getServiceInfos(srvRecords);
return (IServiceInfo[]) serviceInfos.toArray(new IServiceInfo[serviceInfos.size()]);
}
private List getServiceInfos(Collection srvQueryResult) {
List infos = new ArrayList();
for (Iterator iterator = srvQueryResult.iterator(); iterator.hasNext();) {
SRVRecord srvRecord = (SRVRecord) iterator.next();
long ttl = srvRecord.getTTL();
int priority = srvRecord.getPriority();
int weight = srvRecord.getWeight();
int port = srvRecord.getPort();
Name target = srvRecord.getTarget();
String host = target.toString();
host = host.substring(0, host.length() - 1);
IServiceTypeID aServiceTypeID = new DnsSdServiceTypeID(getConnectNamespace(), srvRecord.getName());
// query for txt records (attributes)
Properties props = new Properties();
Lookup txtQuery = new Lookup(srvRecord.getName(), Type.TXT);
txtQuery.setResolver(resolver);
Record[] txtQueryResults = txtQuery.run();
int length = txtQueryResults == null ? 0 : txtQueryResults.length;
for (int l = 0; l < length; l++) {
TXTRecord txtResult = (TXTRecord) txtQueryResults[l];
List strings = txtResult.getStrings();
for (Iterator itr = strings.iterator(); itr.hasNext();) {
String str = (String) itr.next();
String[] split = str.split("="); //$NON-NLS-1$
props.put(split[0], split[1]);
}
}
String path = props.getProperty(DNS_SD_PATH);
String proto = props.getProperty(DNS_SD_PTCL) == null ? aServiceTypeID.getProtocols()[0] : props.getProperty(DNS_SD_PTCL);
URI uri = URI.create(proto + "://" + host + ":" + port + (path == null ? "" : path)); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
IServiceInfo info =new ServiceInfo(uri, host, aServiceTypeID, priority, weight, new ServiceProperties(props), ttl);
infos.add(info);
}
return infos;
}
/*
* (non-Javadoc)
*
* @see
* org.eclipse.ecf.core.IContainer#connect(org.eclipse.ecf.core.identity.ID,
* org.eclipse.ecf.core.security.IConnectContext)
*/
public void connect(ID aTargetID, IConnectContext connectContext)
throws ContainerConnectException {
// connect can only be called once
if (targetID != null || getConfig() == null) {
throw new ContainerConnectException(Messages.DnsSdDiscoveryLocator_Container_Already_Connected);
}
// fall back to the search path as last resort
if(aTargetID == null || !(aTargetID instanceof DnsSdServiceTypeID)) {
ResolverConfig config = new ResolverConfig();
Name[] searchPaths = config.searchPath();
if(searchPaths != null && searchPaths.length > 0) {
targetID = new DnsSdServiceTypeID();
targetID.setSearchPath(searchPaths);
} else {
throw new ContainerConnectException(Messages.DnsSdDiscoveryLocator_No_Target_ID);
}
} else {
final Namespace ns = getConnectNamespace();
try {
targetID = (DnsSdServiceTypeID) ns.createInstance(new Object[]{aTargetID});
} catch(IDCreateException e) {
throw new ContainerConnectException(e);
}
}
// instantiate a default resolver
if(resolver == null) {
try {
resolver = new SimpleResolver();
} catch (UnknownHostException e) {
throw new ContainerConnectException(e);
}
}
// read browsing domains for the given targetID/searchpath and merge with existing
targetID.addSearchPath(getBrowsingDomains(targetID));
// done setting up this provider, send event
fireContainerEvent(new ContainerConnectingEvent(this.getID(), targetID,
connectContext));
fireContainerEvent(new ContainerConnectedEvent(this.getID(), targetID));
}
private String[] getBrowsingDomains(IServiceTypeID aServiceTypeId) {
final String[] rrs = new String[] {BnRDnsSdServiceTypeID.BROWSE_DOMAINS, BnRDnsSdServiceTypeID.DEFAULT_BROWSE_DOMAIN};
final Collection res = getBrowsingOrRegistrationDomains(aServiceTypeId, rrs);
return (String[]) res.toArray(new String[res.size()]);
}
/* (non-Javadoc)
* @see org.eclipse.ecf.discovery.AbstractDiscoveryContainerAdapter#getContainerName()
*/
public String getContainerName() {
return Activator.DISCOVERY_CONTAINER_NAME_VALUE + Activator.LOCATOR;
}
}
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