1 files changed, 156 insertions, 0 deletions
diff --git a/Swiften/Network/PlatformDomainNameServiceQuery.cpp b/Swiften/Network/PlatformDomainNameServiceQuery.cpp
new file mode 100644
index 0000000..eeb9fd6
--- /dev/null
+++ b/Swiften/Network/PlatformDomainNameServiceQuery.cpp
@@ -0,0 +1,156 @@
+#include "Swiften/Network/PlatformDomainNameServiceQuery.h"
+
+#include "Swiften/Base/Platform.h"
+#include <stdlib.h>
+#ifdef SWIFTEN_PLATFORM_WINDOWS
+#undef UNICODE
+#include <windows.h>
+#include <windns.h>
+#ifndef DNS_TYPE_SRV
+#define DNS_TYPE_SRV 33
+#endif
+#else
+#include <arpa/nameser.h>
+#include <arpa/nameser_compat.h>
+#include <resolv.h>
+#endif
+#include <boost/bind.hpp>
+
+#include "Swiften/Base/ByteArray.h"
+#include "Swiften/EventLoop/MainEventLoop.h"
+#include "Swiften/Base/foreach.h"
+
+using namespace Swift;
+
+namespace {
+	struct SRVRecordPriorityComparator {
+		bool operator()(const DomainNameServiceQuery::Result& a, const DomainNameServiceQuery::Result& b) const {
+			return a.priority < b.priority;
+		}
+	};
+}
+
+namespace Swift {
+
+PlatformDomainNameServiceQuery::PlatformDomainNameServiceQuery(const String& service) : service(service) {
+}
+
+void PlatformDomainNameServiceQuery::run() {
+	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) {
+			SRVRecord 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 = std::string((const char*) currentEntry->Data.SRV.pNameTarget);
+			records.push_back(record);
+		}
+		currentEntry = currentEntry->pNext;
+	}
+	DnsRecordListFree(responses, DnsFreeRecordList);
+
+#else
+
+	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
+
+	std::sort(records.begin(), records.end(), SRVRecordPriorityComparator());
+	MainEventLoop::postEvent(boost::bind(boost::ref(onResult), records)); 
+}
+
+void PlatformDomainNameServiceQuery::emitError() {
+	MainEventLoop::postEvent(boost::bind(boost::ref(onResult), std::vector<DomainNameServiceQuery::Result>()), shared_from_this());
+}
+
+}