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/*
* Copyright (c) 2010-2019 Isode Limited.
* All rights reserved.
* See the COPYING file for more information.
*/
#include <boost/asio.hpp>
#include <Swiften/Network/PlatformDomainNameServiceQuery.h>
#pragma GCC diagnostic ignored "-Wold-style-cast"
#include <Swiften/Base/Platform.h>
#include <stdlib.h>
#include <boost/numeric/conversion/cast.hpp>
#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/EventLoop.h>
#include <Swiften/Base/Log.h>
#include <Swiften/Base/StdRandomGenerator.h>
#include <Swiften/Network/PlatformDomainNameResolver.h>
using namespace Swift;
namespace Swift {
PlatformDomainNameServiceQuery::PlatformDomainNameServiceQuery(const boost::optional<std::string>& serviceName, EventLoop* eventLoop, PlatformDomainNameResolver* resolver) : PlatformDomainNameQuery(resolver), eventLoop(eventLoop), serviceValid(false) {
if (!!serviceName) {
service = *serviceName;
serviceValid = true;
}
}
PlatformDomainNameServiceQuery::~PlatformDomainNameServiceQuery() {
}
void PlatformDomainNameServiceQuery::run() {
getResolver()->addQueryToQueue(shared_from_this());
}
void PlatformDomainNameServiceQuery::runBlocking() {
if (!serviceValid) {
emitError();
return;
}
SWIFT_LOG(debug) << "Querying " << service;
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.c_str(), 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 = std::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();
ByteArray response;
response.resize(NS_PACKETSZ);
int responseLength = res_query(const_cast<char*>(service.c_str()), ns_c_in, ns_t_srv, reinterpret_cast<u_char*>(vecptr(response)), response.size());
if (responseLength == -1) {
SWIFT_LOG(debug) << "Error";
emitError();
return;
}
// Parse header
HEADER* header = reinterpret_cast<HEADER*>(vecptr(response));
unsigned char* messageStart = vecptr(response);
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;
try {
// Priority
if (currentEntry + 2 >= messageEnd) {
emitError();
return;
}
record.priority = boost::numeric_cast<int>(ns_get16(currentEntry));
currentEntry += 2;
// Weight
if (currentEntry + 2 >= messageEnd) {
emitError();
return;
}
record.weight = boost::numeric_cast<int>(ns_get16(currentEntry));
currentEntry += 2;
// Port
if (currentEntry + 2 >= messageEnd) {
emitError();
return;
}
record.port = boost::numeric_cast<unsigned short>(ns_get16(currentEntry));
currentEntry += 2;
// Hostname
if (currentEntry >= messageEnd) {
emitError();
return;
}
}
catch (const boost::numeric::bad_numeric_cast&) {
emitError();
return;
}
ByteArray entry;
entry.resize(NS_MAXDNAME);
entryLength = dn_expand(messageStart, messageEnd, currentEntry, reinterpret_cast<char*>(vecptr(entry)), entry.size());
if (entryLength < 0) {
emitError();
return;
}
record.hostname = std::string(reinterpret_cast<const char*>(vecptr(entry)));
records.push_back(record);
currentEntry += entryLength;
answersCount--;
}
#endif
StdRandomGenerator generator;
DomainNameServiceQuery::sortResults(records, generator);
//std::cout << "Sending out " << records.size() << " SRV results " << std::endl;
eventLoop->postEvent(boost::bind(boost::ref(onResult), records), shared_from_this());
}
void PlatformDomainNameServiceQuery::emitError() {
eventLoop->postEvent(boost::bind(boost::ref(onResult), std::vector<DomainNameServiceQuery::Result>()), shared_from_this());
}
}
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