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/*
* Copyright (c) 2010-2016 Isode Limited.
* All rights reserved.
* See the COPYING file for more information.
*/
#include <Swiften/LinkLocal/DNSSD/Bonjour/BonjourQuerier.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <unistd.h>
#include <Swiften/Base/Algorithm.h>
#include <Swiften/Base/foreach.h>
#include <Swiften/LinkLocal/DNSSD/Bonjour/BonjourBrowseQuery.h>
#include <Swiften/LinkLocal/DNSSD/Bonjour/BonjourRegisterQuery.h>
#include <Swiften/LinkLocal/DNSSD/Bonjour/BonjourResolveHostnameQuery.h>
#include <Swiften/LinkLocal/DNSSD/Bonjour/BonjourResolveServiceQuery.h>
namespace Swift {
BonjourQuerier::BonjourQuerier(EventLoop* eventLoop) : eventLoop(eventLoop), stopRequested(false), thread(nullptr) {
int fds[2];
int result = pipe(fds);
assert(result == 0);
(void) result;
interruptSelectReadSocket = fds[0];
fcntl(interruptSelectReadSocket, F_SETFL, fcntl(interruptSelectReadSocket, F_GETFL)|O_NONBLOCK);
interruptSelectWriteSocket = fds[1];
}
BonjourQuerier::~BonjourQuerier() {
assert(!thread);
}
std::shared_ptr<DNSSDBrowseQuery> BonjourQuerier::createBrowseQuery() {
return std::make_shared<BonjourBrowseQuery>(shared_from_this(), eventLoop);
}
std::shared_ptr<DNSSDRegisterQuery> BonjourQuerier::createRegisterQuery(const std::string& name, int port, const ByteArray& info) {
return std::make_shared<BonjourRegisterQuery>(name, port, info, shared_from_this(), eventLoop);
}
std::shared_ptr<DNSSDResolveServiceQuery> BonjourQuerier::createResolveServiceQuery(const DNSSDServiceID& service) {
return std::make_shared<BonjourResolveServiceQuery>(service, shared_from_this(), eventLoop);
}
std::shared_ptr<DNSSDResolveHostnameQuery> BonjourQuerier::createResolveHostnameQuery(const std::string& hostname, int interfaceIndex) {
return std::make_shared<BonjourResolveHostnameQuery>(hostname, interfaceIndex, shared_from_this(), eventLoop);
}
void BonjourQuerier::addRunningQuery(std::shared_ptr<BonjourQuery> query) {
{
std::lock_guard<std::mutex> lock(runningQueriesMutex);
runningQueries.push_back(query);
}
runningQueriesAvailableEvent.notify_one();
interruptSelect();
}
void BonjourQuerier::removeRunningQuery(std::shared_ptr<BonjourQuery> query) {
{
std::lock_guard<std::mutex> lock(runningQueriesMutex);
erase(runningQueries, query);
}
}
void BonjourQuerier::interruptSelect() {
char c = 0;
write(interruptSelectWriteSocket, &c, 1);
}
void BonjourQuerier::start() {
assert(!thread);
thread = new std::thread(boost::bind(&BonjourQuerier::run, shared_from_this()));
}
void BonjourQuerier::stop() {
if (thread) {
stopRequested = true;
assert(runningQueries.empty());
runningQueriesAvailableEvent.notify_one();
interruptSelect();
thread->join();
delete thread;
thread = nullptr;
stopRequested = false;
}
}
void BonjourQuerier::run() {
while (!stopRequested) {
fd_set fdSet;
int maxSocket;
{
std::unique_lock<std::mutex> lock(runningQueriesMutex);
if (runningQueries.empty()) {
runningQueriesAvailableEvent.wait(lock);
if (runningQueries.empty()) {
continue;
}
}
// Run all running queries
FD_ZERO(&fdSet);
maxSocket = interruptSelectReadSocket;
FD_SET(interruptSelectReadSocket, &fdSet);
foreach(const std::shared_ptr<BonjourQuery>& query, runningQueries) {
int socketID = query->getSocketID();
maxSocket = std::max(maxSocket, socketID);
FD_SET(socketID, &fdSet);
}
}
if (select(maxSocket+1, &fdSet, nullptr, nullptr, nullptr) <= 0) {
continue;
}
if (FD_ISSET(interruptSelectReadSocket, &fdSet)) {
char dummy;
while (read(interruptSelectReadSocket, &dummy, 1) > 0) {}
}
{
std::lock_guard<std::mutex> lock(runningQueriesMutex);
foreach(std::shared_ptr<BonjourQuery> query, runningQueries) {
if (FD_ISSET(query->getSocketID(), &fdSet)) {
query->processResult();
}
}
}
}
}
}
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Swift