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/*
* Copyright (c) 2010 Remko Tronçon
* Licensed under the GNU General Public License v3.
* See Documentation/Licenses/GPLv3.txt for more information.
*/
/*
* Copyright (c) 2010, Isode Limited, London, England.
* All rights reserved.
*/
package com.isode.stroke.network;
import com.isode.stroke.eventloop.EventLoop;
import com.isode.stroke.eventloop.EventOwner;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Hashtable;
import javax.naming.NamingException;
import javax.naming.directory.Attribute;
import javax.naming.directory.Attributes;
import javax.naming.directory.DirContext;
import javax.naming.directory.InitialDirContext;
public class PlatformDomainNameServiceQuery extends DomainNameServiceQuery implements EventOwner {
public PlatformDomainNameServiceQuery(String service, EventLoop eventLoop) {
this.service = service;
this.eventLoop = eventLoop;
}
@Override
public void run() {
//TODO: Make async
Collection<Result> results = new ArrayList<Result>();
Hashtable env = new Hashtable();
env.put("java.naming.factory.initial", "com.sun.jndi.dns.DnsContextFactory");
env.put("java.naming.provider.url", "dns:");
try {
DirContext ctx = new InitialDirContext(env);
Attributes attrs = ctx.getAttributes(this.service, new String[]{"SRV"});
Attribute attribute = attrs.get("SRV");
for (int i = 0; attribute != null && i < attribute.size(); i++) {
/* SRV results are going to be returned in the space-separated format
* Priority Weight Port Target
* (See RFC2782)
*/
String[] srvParts = ((String) attribute.get(i)).split(" ");
String host = srvParts[3];
if (host.endsWith(".")) {
host = host.substring(0, host.length() - 1);
}
Result result = new Result(host, Integer.parseInt(srvParts[2]), Integer.parseInt(srvParts[0]), Integer.parseInt(srvParts[1]));
results.add(result);
}
} catch (NamingException ex) {
/* Turns out that you get the exception just for not finding a result, so we want to fall through to A lookups and ignore.*/
}
onResult.emit(results);
}
// void PlatformDomainNameServiceQuery::doRun() {
// std::vector<DomainNameServiceQuery::Result> records;
//
//#if defined(SWIFTEN_PLATFORM_WINDOWS)
// DNS_RECORD* responses;
// // FIXME: This conversion doesn't work if unicode is deffed above
// if (DnsQuery(service.getUTF8Data(), DNS_TYPE_SRV, DNS_QUERY_STANDARD, NULL, &responses, NULL) != ERROR_SUCCESS) {
// emitError();
// return;
// }
//
// DNS_RECORD* currentEntry = responses;
// while (currentEntry) {
// if (currentEntry->wType == DNS_TYPE_SRV) {
// DomainNameServiceQuery::Result record;
// record.priority = currentEntry->Data.SRV.wPriority;
// record.weight = currentEntry->Data.SRV.wWeight;
// record.port = currentEntry->Data.SRV.wPort;
//
// // The pNameTarget is actually a PCWSTR, so I would have expected this
// // conversion to not work at all, but it does.
// // Actually, it doesn't. Fix this and remove explicit cast
// // Remove unicode undef above as well
// record.hostname = String((const char*) currentEntry->Data.SRV.pNameTarget);
// records.push_back(record);
// }
// currentEntry = currentEntry->pNext;
// }
// DnsRecordListFree(responses, DnsFreeRecordList);
//
//#else
// // Make sure we reinitialize the domain list every time
// res_init();
//
// //std::cout << "SRV: Querying " << service << std::endl;
// ByteArray response;
// response.resize(NS_PACKETSZ);
// int responseLength = res_query(const_cast<char*>(service.getUTF8Data()), ns_c_in, ns_t_srv, reinterpret_cast<u_char*>(response.getData()), response.getSize());
// if (responseLength == -1) {
// emitError();
// return;
// }
//
// // Parse header
// HEADER* header = reinterpret_cast<HEADER*>(response.getData());
// unsigned char* messageStart = reinterpret_cast<unsigned char*>(response.getData());
// unsigned char* messageEnd = messageStart + responseLength;
// unsigned char* currentEntry = messageStart + NS_HFIXEDSZ;
//
// // Skip over the queries
// int queriesCount = ntohs(header->qdcount);
// while (queriesCount > 0) {
// int entryLength = dn_skipname(currentEntry, messageEnd);
// if (entryLength < 0) {
// emitError();
// return;
// }
// currentEntry += entryLength + NS_QFIXEDSZ;
// queriesCount--;
// }
//
// // Process the SRV answers
// int answersCount = ntohs(header->ancount);
// while (answersCount > 0) {
// DomainNameServiceQuery::Result record;
//
// int entryLength = dn_skipname(currentEntry, messageEnd);
// currentEntry += entryLength;
// currentEntry += NS_RRFIXEDSZ;
//
// // Priority
// if (currentEntry + 2 >= messageEnd) {
// emitError();
// return;
// }
// record.priority = ns_get16(currentEntry);
// currentEntry += 2;
//
// // Weight
// if (currentEntry + 2 >= messageEnd) {
// emitError();
// return;
// }
// record.weight = ns_get16(currentEntry);
// currentEntry += 2;
//
// // Port
// if (currentEntry + 2 >= messageEnd) {
// emitError();
// return;
// }
// record.port = ns_get16(currentEntry);
// currentEntry += 2;
//
// // Hostname
// if (currentEntry >= messageEnd) {
// emitError();
// return;
// }
// ByteArray entry;
// entry.resize(NS_MAXDNAME);
// entryLength = dn_expand(messageStart, messageEnd, currentEntry, entry.getData(), entry.getSize());
// if (entryLength < 0) {
// emitError();
// return;
// }
// record.hostname = String(entry.getData());
// records.push_back(record);
// currentEntry += entryLength;
// answersCount--;
// }
//#endif
//
// safeToJoin = true;
// std::sort(records.begin(), records.end(), ResultPriorityComparator());
// //std::cout << "Sending out " << records.size() << " SRV results " << std::endl;
// eventLoop->postEvent(boost::bind(boost::ref(onResult), records));
//}
private final String service;
private final EventLoop eventLoop;
}
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