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authorRemko Tronçon <git@el-tramo.be>2009-12-02 20:42:30 (GMT)
committerRemko Tronçon <git@el-tramo.be>2009-12-03 08:09:01 (GMT)
commit5608da36a3a319070494d5a70ff984e7c172186e (patch)
tree2c44df5a9f0ea0ab180763222e54aece5dc65c93 /Swiften/Network/PlatformDomainNameServiceQuery.cpp
parent6e50bd41dc3f11815a40dfef500dc0d61ea5d737 (diff)
downloadswift-5608da36a3a319070494d5a70ff984e7c172186e.zip
swift-5608da36a3a319070494d5a70ff984e7c172186e.tar.bz2
DNS querying is now asynchronous.
This means we can now move them to a separate thread.
Diffstat (limited to 'Swiften/Network/PlatformDomainNameServiceQuery.cpp')
-rw-r--r--Swiften/Network/PlatformDomainNameServiceQuery.cpp156
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());
+}
+
+}