(svn r15176) -Fix [FS#2554]: querying the content server could free when resolving the hostname or connecting takes long/is timing out.

5 files changed, 542 insertions, 408 deletions

diff --git a/src/network/core/tcp_content.h b/src/network/core/tcp_content.h
index 60f68d933..e084f5fc7 100644
--- a/src/network/core/tcp_content.h
+++ b/src/network/core/tcp_content.h
@@ -191,9 +191,9 @@ public:
 	 * @param sin IP etc. of the client
 	 */
 	NetworkContentSocketHandler(SOCKET s, const struct sockaddr_in *sin) :
-		NetworkTCPSocketHandler(s),
-		client_addr(*sin)
+		NetworkTCPSocketHandler(s)
 	{
+		if (sin != NULL) this->client_addr = *sin;
 	}
 
 	/** On destructing of this class, the socket needs to be closed */
diff --git a/src/network/network.cpp b/src/network/network.cpp
index 80f929f6b..89131156a 100644
--- a/src/network/network.cpp
+++ b/src/network/network.cpp
@@ -946,7 +946,7 @@ static bool NetworkDoClientLoop()
 // We have to do some UDP checking
 void NetworkUDPGameLoop()
 {
-	NetworkContentLoop();
+	_network_content_client.SendReceive();
 	TCPConnecter::CheckCallbacks();
 
 	if (_network_udp_server) {
diff --git a/src/network/network_content.cpp b/src/network/network_content.cpp
index 26a92324f..978f9b9e9 100644
--- a/src/network/network_content.cpp
+++ b/src/network/network_content.cpp
@@ -15,6 +15,7 @@
 #include "../ai/ai.hpp"
 #include "../window_func.h"
 #include "../gui.h"
+#include "../variables.h"
 #include "core/host.h"
 #include "network_content.h"
 
@@ -26,7 +27,7 @@
 
 extern bool TarListAddFile(const char *filename);
 extern bool HasGraphicsSet(const ContentInfo *ci, bool md5sum);
-static ClientNetworkContentSocketHandler *_network_content_client;
+ClientNetworkContentSocketHandler _network_content_client;
 
 /** Wrapper function for the HasProc */
 static bool HasGRFConfig(const ContentInfo *ci, bool md5sum)
@@ -108,15 +109,44 @@ DEF_CONTENT_RECEIVE_COMMAND(Client, PACKET_CONTENT_SERVER_INFO)
 	/* Something we don't have and has filesize 0 does not exist in te system */
 	if (ci->state == ContentInfo::UNSELECTED && ci->filesize == 0) ci->state = ContentInfo::DOES_NOT_EXIST;
 
-	for (ContentCallback **iter = this->callbacks.Begin(); iter != this->callbacks.End(); iter++) {
-		(*iter)->OnReceiveContentInfo(ci);
+	/* Do we already have a stub for this? */
+	for (ContentIterator iter = this->infos.Begin(); iter != this->infos.End(); iter++) {
+		ContentInfo *ici = *iter;
+		if (ici->type == ci->type && ici->unique_id == ci->unique_id &&
+				memcmp(ci->md5sum, ici->md5sum, sizeof(ci->md5sum)) == 0) {
+			/* Preserve the name if possible */
+			if (StrEmpty(ci->name)) strecpy(ci->name, ici->name, lastof(ci->name));
+
+			delete ici;
+			*iter = ci;
+
+			this->OnReceiveContentInfo(ci);
+			return true;
+		}
+	}
+
+	/* Missing content info? Don't list it */
+	if (ci->filesize == 0) {
+		delete ci;
+		return true;
+	}
+
+	*this->infos.Append() = ci;
+
+	/* Incoming data means that we might need to reconsider dependencies */
+	for (ContentIterator iter = this->infos.Begin(); iter != this->infos.End(); iter++) {
+		this->CheckDependencyState(*iter);
 	}
 
+	this->OnReceiveContentInfo(ci);
+
 	return true;
 }
 
 void ClientNetworkContentSocketHandler::RequestContentList(ContentType type)
 {
+	this->Connect();
+
 	Packet *p = new Packet(PACKET_CONTENT_CLIENT_INFO_LIST);
 	p->Send_uint8 ((byte)type);
 	p->Send_uint32(_openttd_newgrf_version);
@@ -126,6 +156,8 @@ void ClientNetworkContentSocketHandler::RequestContentList(ContentType type)
 
 void ClientNetworkContentSocketHandler::RequestContentList(uint count, const ContentID *content_ids)
 {
+	this->Connect();
+
 	while (count > 0) {
 		/* We can "only" send a limited number of IDs in a single packet.
 		 * A packet begins with the packet size and a byte for the type.
@@ -151,6 +183,8 @@ void ClientNetworkContentSocketHandler::RequestContentList(ContentVector *cv, bo
 {
 	if (cv == NULL) return;
 
+	this->Connect();
+
 	/* 20 is sizeof(uint32) + sizeof(md5sum (byte[16])) */
 	assert(cv->Length() < 255);
 	assert(cv->Length() < (SEND_MTU - sizeof(PacketSize) - sizeof(byte) - sizeof(uint8)) / (send_md5sum ? 20 : sizeof(uint32)));
@@ -170,10 +204,45 @@ void ClientNetworkContentSocketHandler::RequestContentList(ContentVector *cv, bo
 	}
 
 	this->Send_Packet(p);
+
+	for (ContentIterator iter = cv->Begin(); iter != cv->End(); iter++) {
+		ContentInfo *ci = *iter;
+		bool found = false;
+		for (ContentIterator iter2 = this->infos.Begin(); iter2 != this->infos.End(); iter2++) {
+			ContentInfo *ci2 = *iter;
+			if (ci->type == ci2->type && ci->unique_id == ci2->unique_id &&
+					(!send_md5sum || memcmp(ci->md5sum, ci2->md5sum, sizeof(ci->md5sum)) == 0)) {
+				found = true;
+				break;
+			}
+		}
+		if (!found) {
+			*this->infos.Append() = ci;
+		} else {
+			delete ci;
+		}
+	}
 }
 
-void ClientNetworkContentSocketHandler::RequestContent(uint count, const uint32 *content_ids)
+void ClientNetworkContentSocketHandler::DownloadSelectedContent(uint &files, uint &bytes)
 {
+	files = 0;
+	bytes = 0;
+
+	/** Make the list of items to download */
+	ContentID *ids = MallocT<ContentID>(infos.Length());
+	for (ContentIterator iter = infos.Begin(); iter != infos.End(); iter++) {
+		const ContentInfo *ci = *iter;
+		if (!ci->IsSelected()) continue;
+
+		ids[files++] = ci->id;
+		bytes += ci->filesize;
+	}
+
+	uint count = files;
+	ContentID *content_ids = ids;
+	this->Connect();
+
 	while (count > 0) {
 		/* We can "only" send a limited number of IDs in a single packet.
 		* A packet begins with the packet size and a byte for the type.
@@ -192,6 +261,8 @@ void ClientNetworkContentSocketHandler::RequestContent(uint count, const uint32
 		count -= p_count;
 		content_ids += count;
 	}
+
+	free(ids);
 }
 
 /**
@@ -300,10 +371,7 @@ DEF_CONTENT_RECEIVE_COMMAND(Client, PACKET_CONTENT_SERVER_CONTENT)
 			return false;
 		}
 
-		/* Tell the rest we downloaded some bytes */
-		for (ContentCallback **iter = this->callbacks.Begin(); iter != this->callbacks.End(); iter++) {
-			(*iter)->OnDownloadProgress(this->curInfo, toRead);
-		}
+		this->OnDownloadProgress(this->curInfo, toRead);
 
 		if (toRead == 0) {
 			/* We read nothing; that's our marker for end-of-stream.
@@ -316,9 +384,7 @@ DEF_CONTENT_RECEIVE_COMMAND(Client, PACKET_CONTENT_SERVER_CONTENT)
 
 				TarListAddFile(GetFullFilename(this->curInfo, false));
 
-				for (ContentCallback **iter = this->callbacks.Begin(); iter != this->callbacks.End(); iter++) {
-					(*iter)->OnDownloadComplete(this->curInfo->id);
-				}
+				this->OnDownloadComplete(this->curInfo->id);
 			} else {
 				ShowErrorMessage(INVALID_STRING_ID, STR_CONTENT_ERROR_COULD_NOT_EXTRACT, 0, 0);
 			}
@@ -339,10 +405,11 @@ DEF_CONTENT_RECEIVE_COMMAND(Client, PACKET_CONTENT_SERVER_CONTENT)
  * @param s the socket to communicate over
  * @param sin the IP/port of the server
  */
-ClientNetworkContentSocketHandler::ClientNetworkContentSocketHandler(SOCKET s, const struct sockaddr_in *sin) :
-	NetworkContentSocketHandler(s, sin),
+ClientNetworkContentSocketHandler::ClientNetworkContentSocketHandler() :
+	NetworkContentSocketHandler(INVALID_SOCKET, NULL),
 	curFile(NULL),
-	curInfo(NULL)
+	curInfo(NULL),
+	isConnecting(false)
 {
 }
 
@@ -351,76 +418,63 @@ ClientNetworkContentSocketHandler::~ClientNetworkContentSocketHandler()
 {
 	delete this->curInfo;
 	if (this->curFile != NULL) fclose(this->curFile);
-}
-
-/**
- * Connect to the content server if needed, return the socket handler and
- * add the callback to the socket handler.
- * @param cb the callback to add
- * @return the socket handler or NULL is connecting failed
- */
-ClientNetworkContentSocketHandler *NetworkContent_Connect(ContentCallback *cb)
-{
-	/* If there's no connection or when it's broken, we try to reconnect.
-	 * Otherwise we just add ourselves and return immediatelly */
-	if (_network_content_client != NULL && !_network_content_client->has_quit) {
-		*_network_content_client->callbacks.Append() = cb;
-		return _network_content_client;
-	}
 
-	SOCKET s = socket(AF_INET, SOCK_STREAM, 0);
-	if (s == INVALID_SOCKET) return NULL;
-
-	if (!SetNoDelay(s)) DEBUG(net, 1, "Setting TCP_NODELAY failed");
+	for (ContentIterator iter = this->infos.Begin(); iter != this->infos.End(); iter++) delete *iter;
+}
 
-	struct sockaddr_in sin;
-	sin.sin_family = AF_INET;
-	sin.sin_addr.s_addr = NetworkResolveHost(NETWORK_CONTENT_SERVER_HOST);
-	sin.sin_port = htons(NETWORK_CONTENT_SERVER_PORT);
+class NetworkContentConnecter : TCPConnecter {
+public:
+	NetworkContentConnecter(const NetworkAddress &address) : TCPConnecter(address) {}
 
-	/* We failed to connect for which reason what so ever */
-	if (connect(s, (struct sockaddr*)&sin, sizeof(sin)) != 0) return NULL;
+	virtual void OnFailure()
+	{
+		_network_content_client.isConnecting = false;
+		_network_content_client.OnConnect(false);
+	}
 
-	if (!SetNonBlocking(s)) DEBUG(net, 0, "Setting non-blocking mode failed"); // XXX should this be an error?
+	virtual void OnConnect(SOCKET s)
+	{
+		assert(_network_content_client.sock == INVALID_SOCKET);
+		_network_content_client.isConnecting = false;
+		_network_content_client.sock = s;
+		_network_content_client.has_quit = false;
+		_network_content_client.OnConnect(true);
+	}
+};
 
-	if (_network_content_client != NULL) {
-		if (_network_content_client->sock != INVALID_SOCKET) closesocket(_network_content_client->sock);
-		_network_content_client->sock = s;
+/**
+ * Connect with the content server.
+ */
+void ClientNetworkContentSocketHandler::Connect()
+{
+	this->lastActivity = _realtime_tick;
 
-		/* Clean up the mess that could've been left behind */
-		_network_content_client->has_quit = false;
-		delete _network_content_client->curInfo;
-		_network_content_client->curInfo = NULL;
-		if (_network_content_client->curFile != NULL) fclose(_network_content_client->curFile);
-		_network_content_client->curFile = NULL;
-	} else {
-		_network_content_client = new ClientNetworkContentSocketHandler(s, &sin);
-	}
-	*_network_content_client->callbacks.Append() = cb;
-	return _network_content_client;
+	if (this->sock != INVALID_SOCKET || this->isConnecting) return;
+	this->isConnecting = true;
+	new NetworkContentConnecter(NetworkAddress(NETWORK_CONTENT_SERVER_HOST, NETWORK_CONTENT_SERVER_PORT));
 }
 
 /**
- * Remove yourself from the network content callback list and when
- * that list is empty the connection will be closed.
+ * Disconnect from the content server.
  */
-void NetworkContent_Disconnect(ContentCallback *cb)
+void ClientNetworkContentSocketHandler::Disconnect()
 {
-	_network_content_client->callbacks.Erase(_network_content_client->callbacks.Find(cb));
-
-	if (_network_content_client->callbacks.Length() == 0) {
-		delete _network_content_client;
-		_network_content_client = NULL;
-	}
+	if (this->sock == INVALID_SOCKET) return;
+	this->Close();
 }
 
 /**
  * Check whether we received/can send some data from/to the content server and
  * when that's the case handle it appropriately
  */
-void NetworkContentLoop()
+void ClientNetworkContentSocketHandler::SendReceive()
 {
-	if (_network_content_client == NULL) return;
+	if (this->sock == INVALID_SOCKET || this->isConnecting) return;
+
+	if (this->lastActivity + IDLE_TIMEOUT < _realtime_tick) {
+		this->Close();
+		return;
+	}
 
 	fd_set read_fd, write_fd;
 	struct timeval tv;
@@ -428,8 +482,8 @@ void NetworkContentLoop()
 	FD_ZERO(&read_fd);
 	FD_ZERO(&write_fd);
 
-	FD_SET(_network_content_client->sock, &read_fd);
-	FD_SET(_network_content_client->sock, &write_fd);
+	FD_SET(this->sock, &read_fd);
+	FD_SET(this->sock, &write_fd);
 
 	tv.tv_sec = tv.tv_usec = 0; // don't block at all.
 #if !defined(__MORPHOS__) && !defined(__AMIGA__)
@@ -437,9 +491,290 @@ void NetworkContentLoop()
 #else
 	WaitSelect(FD_SETSIZE, &read_fd, &write_fd, NULL, &tv, NULL);
 #endif
-	if (FD_ISSET(_network_content_client->sock, &read_fd)) _network_content_client->Recv_Packets();
-	_network_content_client->writable = !!FD_ISSET(_network_content_client->sock, &write_fd);
-	_network_content_client->Send_Packets();
+	if (FD_ISSET(this->sock, &read_fd)) this->Recv_Packets();
+	this->writable = !!FD_ISSET(this->sock, &write_fd);
+	this->Send_Packets();
+}
+
+/**
+ * Download information of a given Content ID if not already tried
+ * @param cid the ID to try
+ */
+void ClientNetworkContentSocketHandler::DownloadContentInfo(ContentID cid)
+{
+	/* When we tried to download it already, don't try again */
+	if (this->requested.Contains(cid)) return;
+
+	*this->requested.Append() = cid;
+	assert(this->requested.Contains(cid));
+	this->RequestContentList(1, &cid);
+}
+
+/**
+ * Get the content info based on a ContentID
+ * @param cid the ContentID to search for
+ * @return the ContentInfo or NULL if not found
+ */
+ContentInfo *ClientNetworkContentSocketHandler::GetContent(ContentID cid)
+{
+	for (ContentIterator iter = this->infos.Begin(); iter != this->infos.End(); iter++) {
+		ContentInfo *ci = *iter;
+		if (ci->id == cid) return ci;
+	}
+	return NULL;
+}
+
+
+/**
+ * Select a specific content id.
+ * @param cid the content ID to select
+ */
+void ClientNetworkContentSocketHandler::Select(ContentID cid)
+{
+	ContentInfo *ci = this->GetContent(cid);
+	if (ci->state != ContentInfo::UNSELECTED) return;
+
+	ci->state = ContentInfo::SELECTED;
+	this->CheckDependencyState(ci);
+}
+
+/**
+ * Unselect a specific content id.
+ * @param cid the content ID to deselect
+ */
+void ClientNetworkContentSocketHandler::Unselect(ContentID cid)
+{
+	ContentInfo *ci = this->GetContent(cid);
+	if (!ci->IsSelected()) return;
+
+	ci->state = ContentInfo::UNSELECTED;
+	this->CheckDependencyState(ci);
+}
+
+/** Select everything we can select */
+void ClientNetworkContentSocketHandler::SelectAll()
+{
+	for (ContentIterator iter = this->infos.Begin(); iter != this->infos.End(); iter++) {
+		ContentInfo *ci = *iter;
+		if (ci->state == ContentInfo::UNSELECTED) {
+			ci->state = ContentInfo::SELECTED;
+			this->CheckDependencyState(ci);
+		}
+	}
+}
+
+/** Select everything that's an update for something we've got */
+void ClientNetworkContentSocketHandler::SelectUpdate()
+{
+	for (ContentIterator iter = this->infos.Begin(); iter != this->infos.End(); iter++) {
+		ContentInfo *ci = *iter;
+		if (ci->state == ContentInfo::UNSELECTED && ci->update) {
+			ci->state = ContentInfo::SELECTED;
+			this->CheckDependencyState(ci);
+		}
+	}
+}
+
+/** Unselect everything that we've not downloaded so far. */
+void ClientNetworkContentSocketHandler::UnselectAll()
+{
+	for (ContentIterator iter = this->infos.Begin(); iter != this->infos.End(); iter++) {
+		ContentInfo *ci = *iter;
+		if (ci->IsSelected()) ci->state = ContentInfo::UNSELECTED;
+	}
+}
+
+/** Toggle the state of a content info and check it's dependencies */
+void ClientNetworkContentSocketHandler::ToggleSelectedState(const ContentInfo *ci)
+{
+	switch (ci->state) {
+		case ContentInfo::SELECTED:
+		case ContentInfo::AUTOSELECTED:
+			this->Unselect(ci->id);
+			break;
+
+		case ContentInfo::UNSELECTED:
+			this->Select(ci->id);
+			break;
+
+		default:
+			break;
+	}
+}
+
+/**
+ * Reverse lookup the dependencies of (direct) parents over a given child.
+ * @param parents list to store all parents in (is not cleared)
+ * @param child   the child to search the parents' dependencies for
+ */
+void ClientNetworkContentSocketHandler::ReverseLookupDependency(ConstContentVector &parents, const ContentInfo *child) const
+{
+	for (ConstContentIterator iter = this->infos.Begin(); iter != this->infos.End(); iter++) {
+		const ContentInfo *ci = *iter;
+		if (ci == child) continue;
+
+		for (uint i = 0; i < ci->dependency_count; i++) {
+			if (ci->dependencies[i] == child->id) {
+				*parents.Append() = ci;
+				break;
+			}
+		}
+	}
+}
+
+/**
+ * Reverse lookup the dependencies of all parents over a given child.
+ * @param tree  list to store all parents in (is not cleared)
+ * @param child the child to search the parents' dependencies for
+ */
+void ClientNetworkContentSocketHandler::ReverseLookupTreeDependency(ConstContentVector &tree, const ContentInfo *child) const
+{
+	*tree.Append() = child;
+
+	/* First find all direct parents */
+	for (ConstContentIterator iter = tree.Begin(); iter != tree.End(); iter++) {
+		ConstContentVector parents;
+		this->ReverseLookupDependency(parents, *iter);
+
+		for (ConstContentIterator piter = parents.Begin(); piter != parents.End(); piter++) {
+			tree.Include(*piter);
+		}
+	}
+}
+
+/**
+ * Check the dependencies (recursively) of this content info
+ * @param ci the content info to check the dependencies of
+ */
+void ClientNetworkContentSocketHandler::CheckDependencyState(ContentInfo *ci)
+{
+	if (ci->IsSelected() || ci->state == ContentInfo::ALREADY_HERE) {
+		/* Selection is easy; just walk all children and set the
+		 * autoselected state. That way we can see what we automatically
+		 * selected and thus can unselect when a dependency is removed. */
+		for (uint i = 0; i < ci->dependency_count; i++) {
+			ContentInfo *c = this->GetContent(ci->dependencies[i]);
+			if (c == NULL) {
+				this->DownloadContentInfo(ci->dependencies[i]);
+			} else if (c->state == ContentInfo::UNSELECTED) {
+				c->state = ContentInfo::AUTOSELECTED;
+				this->CheckDependencyState(c);
+			}
+		}
+		return;
+	}
+
+	if (ci->state != ContentInfo::UNSELECTED) return;
+
+	/* For unselection we need to find the parents of us. We need to
+	 * unselect them. After that we unselect all children that we
+	 * depend on and are not used as dependency for us, but only when
+	 * we automatically selected them. */
+	ConstContentVector parents;
+	this->ReverseLookupDependency(parents, ci);
+	for (ConstContentIterator iter = parents.Begin(); iter != parents.End(); iter++) {
+		const ContentInfo *c = *iter;
+		if (!c->IsSelected()) continue;
+
+		this->Unselect(c->id);
+	}
+
+	for (uint i = 0; i < ci->dependency_count; i++) {
+		const ContentInfo *c = this->GetContent(ci->dependencies[i]);
+		if (c == NULL) {
+			DownloadContentInfo(ci->dependencies[i]);
+			continue;
+		}
+		if (c->state != ContentInfo::AUTOSELECTED) continue;
+
+		/* Only unselect when WE are the only parent. */
+		parents.Clear();
+		this->ReverseLookupDependency(parents, c);
+
+		/* First check whether anything depends on us */
+		int sel_count = 0;
+		bool force_selection = false;
+		for (ConstContentIterator iter = parents.Begin(); iter != parents.End(); iter++) {
+			if ((*iter)->IsSelected()) sel_count++;
+			if ((*iter)->state == ContentInfo::SELECTED) force_selection = true;
+		}
+		if (sel_count == 0) {
+			/* Nothing depends on us */
+			this->Unselect(c->id);
+			continue;
+		}
+		/* Something manually selected depends directly on us */
+		if (force_selection) continue;
+
+		/* "Flood" search to find all items in the dependency graph*/
+		parents.Clear();
+		this->ReverseLookupTreeDependency(parents, c);
+
+		/* Is there anything that is "force" selected?, if so... we're done. */
+		for (ConstContentIterator iter = parents.Begin(); iter != parents.End(); iter++) {
+			if ((*iter)->state != ContentInfo::SELECTED) continue;
+
+			force_selection = true;
+			break;
+		}
+
+		/* So something depended directly on us */
+		if (force_selection) continue;
+
+		/* Nothing depends on us, mark the whole graph as unselected.
+		 * After that's done run over them once again to test their children
+		 * to unselect. Don't do it immediatelly because it'll do exactly what
+		 * we're doing now. */
+		for (ConstContentIterator iter = parents.Begin(); iter != parents.End(); iter++) {
+			const ContentInfo *c = *iter;
+			if (c->state == ContentInfo::AUTOSELECTED) this->Unselect(c->id);
+		}
+		for (ConstContentIterator iter = parents.Begin(); iter != parents.End(); iter++) {
+			this->CheckDependencyState(this->GetContent((*iter)->id));
+		}
+	}
+}
+
+/*** CALLBACK ***/
+
+void ClientNetworkContentSocketHandler::OnConnect(bool success)
+{
+	for (ContentCallback **iter = this->callbacks.Begin(); iter != this->callbacks.End(); iter++) {
+		(*iter)->OnConnect(success);
+	}
+}
+
+void ClientNetworkContentSocketHandler::OnDisconnect()
+{
+	for (ContentCallback **iter = this->callbacks.Begin(); iter != this->callbacks.End(); iter++) {
+		(*iter)->OnDisconnect();
+	}
+}
+
+void ClientNetworkContentSocketHandler::OnReceiveContentInfo(const ContentInfo *ci)
+{
+	for (ContentCallback **iter = this->callbacks.Begin(); iter != this->callbacks.End(); iter++) {
+		(*iter)->OnReceiveContentInfo(ci);
+	}
+}
+
+void ClientNetworkContentSocketHandler::OnDownloadProgress(const ContentInfo *ci, uint bytes)
+{
+	for (ContentCallback **iter = this->callbacks.Begin(); iter != this->callbacks.End(); iter++) {
+		(*iter)->OnDownloadProgress(ci, bytes);
+	}
+}
+
+void ClientNetworkContentSocketHandler::OnDownloadComplete(ContentID cid)
+{
+	ContentInfo *ci = this->GetContent(cid);
+	if (ci != NULL) {
+		ci->state = ContentInfo::ALREADY_HERE;
+	}
+
+	for (ContentCallback **iter = this->callbacks.Begin(); iter != this->callbacks.End(); iter++) {
+		(*iter)->OnDownloadComplete(cid);
+	}
 }
 
 #endif /* ENABLE_NETWORK */
diff --git a/src/network/network_content.h b/src/network/network_content.h
index bcbb05f8f..a566dafc4 100644
--- a/src/network/network_content.h
+++ b/src/network/network_content.h
@@ -12,23 +12,37 @@
 
 /** Vector with content info */
 typedef SmallVector<ContentInfo *, 16> ContentVector;
+typedef SmallVector<const ContentInfo *, 16> ConstContentVector;
+
 /** Iterator for the content vector */
 typedef ContentInfo **ContentIterator;
+typedef const ContentInfo * const * ConstContentIterator;
 
 /** Callbacks for notifying others about incoming data */
 struct ContentCallback {
 	/**
+	 * Callback for when the connection has finished
+	 * @param success whether the connection was made or that we failed to make it
+	 */
+	virtual void OnConnect(bool success) {}
+
+	/**
+	 * Callback for when the connection got disconnected.
+	 */
+	virtual void OnDisconnect() {}
+
+	/**
 	 * We received a content info.
 	 * @param ci the content info
 	 */
-	virtual void OnReceiveContentInfo(ContentInfo *ci) {}
+	virtual void OnReceiveContentInfo(const ContentInfo *ci) {}
 
 	/**
 	 * We have progress in the download of a file
 	 * @param ci the content info of the file
 	 * @param bytes the number of bytes downloaded since the previous call
 	 */
-	virtual void OnDownloadProgress(ContentInfo *ci, uint bytes) {}
+	virtual void OnDownloadProgress(const ContentInfo *ci, uint bytes) {}
 
 	/**
 	 * We have finished downloading a file
@@ -43,32 +57,74 @@ struct ContentCallback {
 /**
  * Socket handler for the content server connection
  */
-class ClientNetworkContentSocketHandler : public NetworkContentSocketHandler {
+class ClientNetworkContentSocketHandler : public NetworkContentSocketHandler, ContentCallback {
 protected:
 	SmallVector<ContentCallback *, 2> callbacks; ///< Callbacks to notify "the world"
+	SmallVector<ContentID, 4> requested;         ///< ContentIDs we already requested (so we don't do it again)
+	ContentVector infos;                         ///< All content info we received
 
 	FILE *curFile;        ///< Currently downloaded file
 	ContentInfo *curInfo; ///< Information about the currently downloaded file
+	bool isConnecting;    ///< Whether we're connecting
+	uint32 lastActivity;  ///< The last time there was network activity
 
-	friend ClientNetworkContentSocketHandler *NetworkContent_Connect(ContentCallback *cb);
-	friend void NetworkContent_Disconnect(ContentCallback *cb);
+	friend class NetworkContentConnecter;
 
 	DECLARE_CONTENT_RECEIVE_COMMAND(PACKET_CONTENT_SERVER_INFO);
 	DECLARE_CONTENT_RECEIVE_COMMAND(PACKET_CONTENT_SERVER_CONTENT);
 
-	ClientNetworkContentSocketHandler(SOCKET s, const struct sockaddr_in *sin);
-	~ClientNetworkContentSocketHandler();
+	ContentInfo *GetContent(ContentID cid);
+	void DownloadContentInfo(ContentID cid);
+
+	void OnConnect(bool success);
+	void OnDisconnect();
+	void OnReceiveContentInfo(const ContentInfo *ci);
+	void OnDownloadProgress(const ContentInfo *ci, uint bytes);
+	void OnDownloadComplete(ContentID cid);
 public:
+	/** The idle timeout; when to close the connection because it's idle. */
+	static const int IDLE_TIMEOUT = 60 * 1000;
+
+	ClientNetworkContentSocketHandler();
+	~ClientNetworkContentSocketHandler();
+
+	void Connect();
+	void SendReceive();
+	void Disconnect();
+
 	void RequestContentList(ContentType type);
 	void RequestContentList(uint count, const ContentID *content_ids);
 	void RequestContentList(ContentVector *cv, bool send_md5sum = true);
 
-	void RequestContent(uint count, const uint32 *content_ids);
+	void DownloadSelectedContent(uint &files, uint &bytes);
+
+	void Select(ContentID cid);
+	void Unselect(ContentID cid);
+	void SelectAll();
+	void SelectUpdate();
+	void UnselectAll();
+	void ToggleSelectedState(const ContentInfo *ci);
+
+	void ReverseLookupDependency(ConstContentVector &parents, const ContentInfo *child) const;
+	void ReverseLookupTreeDependency(ConstContentVector &tree, const ContentInfo *child) const;
+	void CheckDependencyState(ContentInfo *ci);
+
+	/** Get the number of content items we know locally. */
+	uint Length() const { return this->infos.Length(); }
+	/** Get the begin of the content inf iterator. */
+	ConstContentIterator Begin() const { return this->infos.Begin(); }
+	/** Get the nth position of the content inf iterator. */
+	ConstContentIterator Get(uint32 index) const { return this->infos.Get(index); }
+	/** Get the end of the content inf iterator. */
+	ConstContentIterator End() const { return this->infos.End(); }
+
+	/** Add a callback to this class */
+	void AddCallback(ContentCallback *cb) { this->callbacks.Include(cb); }
+	/** Remove a callback */
+	void RemoveCallback(ContentCallback *cb) { this->callbacks.Erase(this->callbacks.Find(cb)); }
 };
 
-ClientNetworkContentSocketHandler *NetworkContent_Connect(ContentCallback *cb);
-void NetworkContent_Disconnect(ContentCallback *cb);
-void NetworkContentLoop();
+extern ClientNetworkContentSocketHandler _network_content_client;
 
 void ShowNetworkContentListWindow(ContentVector *cv = NULL, ContentType type = CONTENT_TYPE_END);
 
diff --git a/src/network/network_content_gui.cpp b/src/network/network_content_gui.cpp
index 90aa3e9af..fa8b80d04 100644
--- a/src/network/network_content_gui.cpp
+++ b/src/network/network_content_gui.cpp
@@ -61,33 +61,14 @@ public:
 	 * with flags whether to download them or not.
 	 * @param infos the list to search in
 	 */
-	NetworkContentDownloadStatusWindow(ContentVector &infos) :
+	NetworkContentDownloadStatusWindow() :
 		Window(&_network_content_download_status_window_desc),
 		cur_id(UINT32_MAX)
 	{
 		this->parent = FindWindowById(WC_NETWORK_WINDOW, 1);
-		this->connection = NetworkContent_Connect(this);
 
-		if (this->connection == NULL) {
-			/* When the connection got broken and we can't rebuild it we can't do much :( */
-			ShowErrorMessage(STR_CONTENT_ERROR_COULD_NOT_DOWNLOAD, STR_CONTENT_ERROR_COULD_NOT_DOWNLOAD_CONNECTION_LOST, 0, 0);
-			delete this;
-			return;
-		}
-
-		/** Make the list of items to download */
-		uint32 *ids = MallocT<uint32>(infos.Length());
-		for (ContentIterator iter = infos.Begin(); iter != infos.End(); iter++) {
-			const ContentInfo *ci = *iter;
-			if (!ci->IsSelected()) continue;
-
-			ids[this->total_files++] = ci->id;
-			this->total_bytes += ci->filesize;
-		}
-
-		/** And request them for download */
-		this->connection->RequestContent(this->total_files, ids);
-		free(ids);
+		_network_content_client.AddCallback(this);
+		_network_content_client.DownloadSelectedContent(this->total_files, this->total_bytes);
 
 		this->FindWindowPlacementAndResize(&_network_content_download_status_window_desc);
 	}
@@ -121,7 +102,7 @@ public:
 			}
 		}
 
-		NetworkContent_Disconnect(this);
+		_network_content_client.RemoveCallback(this);
 	}
 
 	virtual void OnPaint()
@@ -158,7 +139,7 @@ public:
 		if (widget == NCDSWW_CANCELOK) delete this;
 	}
 
-	virtual void OnDownloadProgress(ContentInfo *ci, uint bytes)
+	virtual void OnDownloadProgress(const ContentInfo *ci, uint bytes)
 	{
 		if (ci->id != this->cur_id) {
 			strecpy(this->name, ci->filename, lastof(this->name));
@@ -198,11 +179,8 @@ class NetworkContentListWindow : public Window, ContentCallback {
 		NCLWW_RESIZE,        ///< Resize button
 	};
 
-	ClientNetworkContentSocketHandler *connection; ///< Connection with the content server
-	SmallVector<ContentID, 4> requested;           ///< ContentIDs we already requested (so we don't do it again)
-	ContentVector infos;                           ///< All content info we received
-	ContentInfo *selected;                         ///< The selected content info
-	int list_pos;                                  ///< Our position in the list
+	const ContentInfo *selected; ///< The selected content info
+	int list_pos;                ///< Our position in the list
 
 	/** Make sure that the currently selected content info is within the visible part of the matrix */
 	void ScrollToSelected()
@@ -218,232 +196,28 @@ class NetworkContentListWindow : public Window, ContentCallback {
 		}
 	}
 
-	/**
-	 * Download information of a given Content ID if not already tried
-	 * @param cid the ID to try
-	 */
-	void DownloadContentInfo(ContentID cid)
-	{
-		/* When we tried to download it already, don't try again */
-		if (this->requested.Contains(cid)) return;
-
-		*this->requested.Append() = cid;
-		assert(this->requested.Contains(cid));
-		this->connection->RequestContentList(1, &cid);
-	}
-
-
-	/**
-	 * Get the content info based on a ContentID
-	 * @param cid the ContentID to search for
-	 * @return the ContentInfo or NULL if not found
-	 */
-	ContentInfo *GetContent(ContentID cid)
-	{
-		for (ContentIterator iter = this->infos.Begin(); iter != this->infos.End(); iter++) {
-			ContentInfo *ci = *iter;
-			if (ci->id == cid) return ci;
-		}
-		return NULL;
-	}
-
-	/**
-	 * Reverse lookup the dependencies of (direct) parents over a given child.
-	 * @param parents list to store all parents in (is not cleared)
-	 * @param child   the child to search the parents' dependencies for
-	 */
-	void ReverseLookupDependency(ContentVector &parents, ContentInfo *child)
-	{
-		for (ContentIterator iter = this->infos.Begin(); iter != this->infos.End(); iter++) {
-			ContentInfo *ci = *iter;
-			if (ci == child) continue;
-
-			for (uint i = 0; i < ci->dependency_count; i++) {
-				if (ci->dependencies[i] == child->id) {
-					*parents.Append() = ci;
-					break;
-				}
-			}
-		}
-	}
-
-	/**
-	 * Reverse lookup the dependencies of all parents over a given child.
-	 * @param tree  list to store all parents in (is not cleared)
-	 * @param child the child to search the parents' dependencies for
-	 */
-	void ReverseLookupTreeDependency(ContentVector &tree, ContentInfo *child)
-	{
-		*tree.Append() = child;
-
-		/* First find all direct parents */
-		for (ContentIterator iter = tree.Begin(); iter != tree.End(); iter++) {
-			ContentVector parents;
-			ReverseLookupDependency(parents, *iter);
-
-			for (ContentIterator piter = parents.Begin(); piter != parents.End(); piter++) {
-				tree.Include(*piter);
-			}
-		}
-	}
-
-	/**
-	 * Check the dependencies (recursively) of this content info
-	 * @param ci the content info to check the dependencies of
-	 */
-	void CheckDependencyState(ContentInfo *ci)
-	{
-		if (ci->IsSelected() || ci->state == ContentInfo::ALREADY_HERE) {
-			/* Selection is easy; just walk all children and set the
-			 * autoselected state. That way we can see what we automatically
-			 * selected and thus can unselect when a dependency is removed. */
-			for (uint i = 0; i < ci->dependency_count; i++) {
-				ContentInfo *c = this->GetContent(ci->dependencies[i]);
-				if (c == NULL) {
-					DownloadContentInfo(ci->dependencies[i]);
-				} else if (c->state == ContentInfo::UNSELECTED) {
-					c->state = ContentInfo::AUTOSELECTED;
-					this->CheckDependencyState(c);
-				}
-			}
-			return;
-		}
-
-		if (ci->state != ContentInfo::UNSELECTED) return;
-
-		/* For unselection we need to find the parents of us. We need to
-		 * unselect them. After that we unselect all children that we
-		 * depend on and are not used as dependency for us, but only when
-		 * we automatically selected them. */
-		ContentVector parents;
-		ReverseLookupDependency(parents, ci);
-		for (ContentIterator iter = parents.Begin(); iter != parents.End(); iter++) {
-			ContentInfo *c = *iter;
-			if (!c->IsSelected()) continue;
-
-			c->state = ContentInfo::UNSELECTED;
-			CheckDependencyState(c);
-		}
-
-		for (uint i = 0; i < ci->dependency_count; i++) {
-			ContentInfo *c = this->GetContent(ci->dependencies[i]);
-			if (c == NULL) {
-				DownloadContentInfo(ci->dependencies[i]);
-				continue;
-			}
-			if (c->state != ContentInfo::AUTOSELECTED) continue;
-
-			/* Only unselect when WE are the only parent. */
-			parents.Clear();
-			ReverseLookupDependency(parents, c);
-
-			/* First check whether anything depends on us */
-			int sel_count = 0;
-			bool force_selection = false;
-			for (ContentIterator iter = parents.Begin(); iter != parents.End(); iter++) {
-				if ((*iter)->IsSelected()) sel_count++;
-				if ((*iter)->state == ContentInfo::SELECTED) force_selection = true;
-			}
-			if (sel_count == 0) {
-				/* Nothing depends on us */
-				c->state = ContentInfo::UNSELECTED;
-				this->CheckDependencyState(c);
-				continue;
-			}
-			/* Something manually selected depends directly on us */
-			if (force_selection) continue;
-
-			/* "Flood" search to find all items in the dependency graph*/
-			parents.Clear();
-			ReverseLookupTreeDependency(parents, c);
-
-			/* Is there anything that is "force" selected?, if so... we're done. */
-			for (ContentIterator iter = parents.Begin(); iter != parents.End(); iter++) {
-				if ((*iter)->state != ContentInfo::SELECTED) continue;
-
-				force_selection = true;
-				break;
-			}
-
-			/* So something depended directly on us */
-			if (force_selection) continue;
-
-			/* Nothing depends on us, mark the whole graph as unselected.
-			 * After that's done run over them once again to test their children
-			 * to unselect. Don't do it immediatelly because it'll do exactly what
-			 * we're doing now. */
-			for (ContentIterator iter = parents.Begin(); iter != parents.End(); iter++) {
-				ContentInfo *c = *iter;
-				if (c->state == ContentInfo::AUTOSELECTED) c->state = ContentInfo::UNSELECTED;
-			}
-			for (ContentIterator iter = parents.Begin(); iter != parents.End(); iter++) {
-				this->CheckDependencyState(*iter);
-			}
-		}
-	}
-
-	/** Toggle the state of a content info and check it's dependencies */
-	void ToggleSelectedState()
-	{
-		switch (this->selected->state) {
-			case ContentInfo::SELECTED:
-			case ContentInfo::AUTOSELECTED:
-				this->selected->state = ContentInfo::UNSELECTED;
-				break;
-
-			case ContentInfo::UNSELECTED:
-				this->selected->state = ContentInfo::SELECTED;
-				break;
-
-			default:
-				return;
-		}
-
-		this->CheckDependencyState(this->selected);
-	}
-
 public:
 	/**
 	 * Create the content list window.
 	 * @param desc the window description to pass to Window's constructor.
-	 * @param cv the list with content to show; if NULL find content ourselves
 	 */
-	NetworkContentListWindow(const WindowDesc *desc, ContentVector *cv, ContentType type) : Window(desc, 1), selected(NULL), list_pos(0)
+	NetworkContentListWindow(const WindowDesc *desc, bool select_all) : Window(desc, 1), selected(NULL), list_pos(0)
 	{
-		this->connection = NetworkContent_Connect(this);
-
 		this->vscroll.cap = 14;
 		this->resize.step_height = 14;
 		this->resize.step_width = 2;
 
-		if (cv == NULL) {
-			if (type == CONTENT_TYPE_END) {
-				this->connection->RequestContentList(CONTENT_TYPE_BASE_GRAPHICS);
-				this->connection->RequestContentList(CONTENT_TYPE_NEWGRF);
-				this->connection->RequestContentList(CONTENT_TYPE_AI);
-			} else {
-				this->connection->RequestContentList(type);
-			}
-			this->HideWidget(NCLWW_SELECT_ALL);
-		} else {
-			this->connection->RequestContentList(cv, true);
-
-			for (ContentIterator iter = cv->Begin(); iter != cv->End(); iter++) {
-				*this->infos.Append() = *iter;
-			}
-			this->HideWidget(NCLWW_SELECT_UPDATE);
-		}
+		_network_content_client.AddCallback(this);
+		this->HideWidget(select_all ? NCLWW_SELECT_UPDATE : NCLWW_SELECT_ALL);
 
-		SetVScrollCount(this, this->infos.Length());
+		SetVScrollCount(this, _network_content_client.Length());
 		this->FindWindowPlacementAndResize(desc);
 	}
 
 	/** Free everything we allocated */
 	~NetworkContentListWindow()
 	{
-		NetworkContent_Disconnect(this);
-
-		for (ContentIterator iter = this->infos.Begin(); iter != this->infos.End(); iter++) delete *iter;
+		_network_content_client.RemoveCallback(this);
 	}
 
 	virtual void OnPaint()
@@ -452,7 +226,7 @@ public:
 		uint filesize = 0;
 		bool show_select_all = false;
 		bool show_select_update = false;
-		for (ContentIterator iter = this->infos.Begin(); iter != this->infos.End(); iter++) {
+		for (ConstContentIterator iter = _network_content_client.Begin(); iter != _network_content_client.End(); iter++) {
 			const ContentInfo *ci = *iter;
 			switch (ci->state) {
 				case ContentInfo::SELECTED:
@@ -480,7 +254,7 @@ public:
 		/* Fill the matrix with the information */
 		uint y = this->widget[NCLWW_MATRIX].top + 3;
 		int cnt = 0;
-		for (ContentIterator iter = this->infos.Get(this->vscroll.pos); iter != this->infos.End() && cnt < this->vscroll.cap; iter++, cnt++) {
+		for (ConstContentIterator iter = _network_content_client.Get(this->vscroll.pos); iter != _network_content_client.End() && cnt < this->vscroll.cap; iter++, cnt++) {
 			const ContentInfo *ci = *iter;
 
 			if (ci == this->selected) GfxFillRect(this->widget[NCLWW_CHECKBOX].left + 1, y - 2, this->widget[NCLWW_NAME].right - 1, y + 9, 10);
@@ -557,17 +331,14 @@ public:
 				ContentID cid = this->selected->dependencies[i];
 
 				/* Try to find the dependency */
-				ContentIterator iter = this->infos.Begin();
-				for (; iter != this->infos.End(); iter++) {
+				ConstContentIterator iter = _network_content_client.Begin();
+				for (; iter != _network_content_client.End(); iter++) {
 					const ContentInfo *ci = *iter;
 					if (ci->id != cid) continue;
 
 					p += seprintf(p, lastof(buf), p == buf ? "%s" : ", %s", (*iter)->name);
 					break;
 				}
-
-				/* We miss the dependency, but we'll only request it if not done before. */
-				if (iter == this->infos.End()) DownloadContentInfo(cid);
 			}
 			SetDParamStr(0, buf);
 			y += DrawStringMultiLine(this->widget[NCLWW_DETAILS].left + 5, y, STR_CONTENT_DETAIL_DEPENDENCIES, this->widget[NCLWW_DETAILS].right - this->widget[NCLWW_DETAILS].left - 5, max_y - y);
@@ -586,13 +357,13 @@ public:
 
 		if (this->selected->IsSelected()) {
 			/* When selected show all manually selected content that depends on this */
-			ContentVector tree;
-			ReverseLookupTreeDependency(tree, this->selected);
+			ConstContentVector tree;
+			_network_content_client.ReverseLookupTreeDependency(tree, this->selected);
 
 			char buf[8192] = "";
 			char *p = buf;
-			for (ContentIterator iter = tree.Begin(); iter != tree.End(); iter++) {
-				ContentInfo *ci = *iter;
+			for (ConstContentIterator iter = tree.Begin(); iter != tree.End(); iter++) {
+				const ContentInfo *ci = *iter;
 				if (ci == this->selected || ci->state != ContentInfo::SELECTED) continue;
 
 				p += seprintf(p, lastof(buf), buf == p ? "%s" : ", %s", ci->name);
@@ -626,34 +397,27 @@ public:
 				if (id_v >= this->vscroll.cap) return; // click out of bounds
 				id_v += this->vscroll.pos;
 
-				if (id_v >= this->infos.Length()) return; // click out of bounds
+				if (id_v >= _network_content_client.Length()) return; // click out of bounds
 
-				this->selected = this->infos[id_v];
+				this->selected = *_network_content_client.Get(id_v);
 				this->list_pos = id_v;
 
-				if (pt.x <= this->widget[NCLWW_CHECKBOX].right) this->ToggleSelectedState();
+				if (pt.x <= this->widget[NCLWW_CHECKBOX].right) _network_content_client.ToggleSelectedState(this->selected);
 
 				this->SetDirty();
 			} break;
 
 			case NCLWW_SELECT_ALL:
+				_network_content_client.SelectAll();
+				this->SetDirty();
+				break;
+
 			case NCLWW_SELECT_UPDATE:
-				for (ContentIterator iter = this->infos.Begin(); iter != this->infos.End(); iter++) {
-					ContentInfo *ci = *iter;
-					if (ci->state == ContentInfo::UNSELECTED && (widget == NCLWW_SELECT_ALL || ci->update)) {
-						ci->state = ContentInfo::SELECTED;
-						CheckDependencyState(ci);
-					}
-				}
+				_network_content_client.SelectUpdate();
 				this->SetDirty();
 				break;
 
 			case NCLWW_UNSELECT:
-				for (ContentIterator iter = this->infos.Begin(); iter != this->infos.End(); iter++) {
-					ContentInfo *ci = *iter;
-					/* No need to check dependencies; when everything's off nothing can depend */
-					if (ci->IsSelected()) ci->state = ContentInfo::UNSELECTED;
-				}
 				this->SetDirty();
 				break;
 
@@ -662,14 +426,14 @@ public:
 				break;
 
 			case NCLWW_DOWNLOAD:
-				new NetworkContentDownloadStatusWindow(this->infos);
+				new NetworkContentDownloadStatusWindow();
 				break;
 		}
 	}
 
 	virtual EventState OnKeyPress(uint16 key, uint16 keycode)
 	{
-		if (this->infos.Length() == 0) return ES_HANDLED;
+		if (_network_content_client.Length() == 0) return ES_HANDLED;
 
 		switch (keycode) {
 			case WKC_UP:
@@ -678,7 +442,7 @@ public:
 				break;
 			case WKC_DOWN:
 				/* scroll down by one */
-				if (this->list_pos < (int)this->infos.Length() - 1) this->list_pos++;
+				if (this->list_pos < (int)_network_content_client.Length() - 1) this->list_pos++;
 				break;
 			case WKC_PAGEUP:
 				/* scroll up a page */
@@ -686,7 +450,7 @@ public:
 				break;
 			case WKC_PAGEDOWN:
 				/* scroll down a page */
-				this->list_pos = min(this->list_pos + this->vscroll.cap, (int)this->infos.Length() - 1);
+				this->list_pos = min(this->list_pos + this->vscroll.cap, (int)_network_content_client.Length() - 1);
 				break;
 			case WKC_HOME:
 				/* jump to beginning */
@@ -694,18 +458,18 @@ public:
 				break;
 			case WKC_END:
 				/* jump to end */
-				this->list_pos = this->infos.Length() - 1;
+				this->list_pos = _network_content_client.Length() - 1;
 				break;
 
 			case WKC_SPACE:
-				this->ToggleSelectedState();
+				_network_content_client.ToggleSelectedState(this->selected);
 				this->SetDirty();
 				return ES_HANDLED;
 
 			default: return ES_NOT_HANDLED;
 		}
 
-		this->selected = this->infos[this->list_pos];
+		this->selected = *_network_content_client.Get(this->list_pos);
 
 		/* scroll to the new server if it is outside the current range */
 		this->ScrollToSelected();
@@ -721,7 +485,7 @@ public:
 
 		this->widget[NCLWW_MATRIX].data = (this->vscroll.cap << 8) + 1;
 
-		SetVScrollCount(this, this->infos.Length());
+		SetVScrollCount(this, _network_content_client.Length());
 
 		/* Make the matrix and details section grow both bigger (or smaller) */
 		delta.x /= 2;
@@ -732,52 +496,25 @@ public:
 		this->widget[NCLWW_DETAILS].left    -= delta.x;
 	}
 
-	virtual void OnReceiveContentInfo(ContentInfo *rci)
+	virtual void OnReceiveContentInfo(const ContentInfo *rci)
 	{
-		/* Do we already have a stub for this? */
-		for (ContentIterator iter = this->infos.Begin(); iter != this->infos.End(); iter++) {
-			ContentInfo *ci = *iter;
-			if (ci->type == rci->type && ci->unique_id == rci->unique_id &&
-					memcmp(ci->md5sum, rci->md5sum, sizeof(ci->md5sum)) == 0) {
-				/* Preserve the name if possible */
-				if (StrEmpty(rci->name)) strecpy(rci->name, ci->name, lastof(rci->name));
-
-				delete ci;
-				*iter = rci;
-
-				this->SetDirty();
-				return;
-			}
-		}
-
-		/* Missing content info? Don't list it */
-		if (rci->filesize == 0) {
-			delete rci;
-			return;
-		}
-
-		/* Nothing selected, lets select something */
-		if (this->selected == NULL) this->selected = rci;
-
-		*this->infos.Append() = rci;
-		SetVScrollCount(this, this->infos.Length());
-
-		/* Incoming data means that we might need to reconsider dependencies */
-		for (ContentIterator iter = this->infos.Begin(); iter != this->infos.End(); iter++) {
-			CheckDependencyState(*iter);
-		}
-
+		SetVScrollCount(this, _network_content_client.Length());
 		this->SetDirty();
 	}
 
 	virtual void OnDownloadComplete(ContentID cid)
 	{
-		/* When we know something that completed downloading, we have it! */
-		ContentInfo *ci = this->GetContent(cid);
-		if (ci != NULL) {
-			ci->state = ContentInfo::ALREADY_HERE;
-			this->SetDirty();
+		this->SetDirty();
+	}
+
+	virtual void OnConnect(bool success)
+	{
+		if (!success) {
+			ShowErrorMessage(INVALID_STRING_ID, STR_CONTENT_ERROR_COULD_NOT_CONNECT, 0, 0);
+			delete this;
 		}
+
+		this->SetDirty();
 	}
 };
 
@@ -827,21 +564,27 @@ static const WindowDesc _network_content_list_desc = {
 void ShowNetworkContentListWindow(ContentVector *cv, ContentType type)
 {
 #if defined(WITH_ZLIB)
-	if (NetworkContent_Connect(NULL)) {
-		DeleteWindowById(WC_NETWORK_WINDOW, 1);
-		new NetworkContentListWindow(&_network_content_list_desc, cv, type);
-		NetworkContent_Disconnect(NULL);
+	if (cv == NULL) {
+		if (type == CONTENT_TYPE_END) {
+			_network_content_client.RequestContentList(CONTENT_TYPE_BASE_GRAPHICS);
+			_network_content_client.RequestContentList(CONTENT_TYPE_AI);
+			_network_content_client.RequestContentList(CONTENT_TYPE_NEWGRF);
+			_network_content_client.RequestContentList(CONTENT_TYPE_AI_LIBRARY);
+		} else {
+			_network_content_client.RequestContentList(type);
+		}
 	} else {
-		ShowErrorMessage(INVALID_STRING_ID, STR_CONTENT_ERROR_COULD_NOT_CONNECT, 0, 0);
+		_network_content_client.RequestContentList(cv, true);
+	}
+
+	new NetworkContentListWindow(&_network_content_list_desc, cv != NULL);
 #else
-	{
-		ShowErrorMessage(STR_CONTENT_NO_ZLIB_SUB, STR_CONTENT_NO_ZLIB, 0, 0);
-#endif /* WITH_ZLIB */
-		/* Connection failed... clean up the mess */
-		if (cv != NULL) {
-			for (ContentIterator iter = cv->Begin(); iter != cv->End(); iter++) delete *iter;
-		}
+	ShowErrorMessage(STR_CONTENT_NO_ZLIB_SUB, STR_CONTENT_NO_ZLIB, 0, 0);
+	/* Connection failed... clean up the mess */
+	if (cv != NULL) {
+		for (ContentIterator iter = cv->Begin(); iter != cv->End(); iter++) delete *iter;
 	}
+#endif /* WITH_ZLIB */
 }
 
 #endif /* ENABLE_NETWORK */