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#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());
}
}
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Swift