Merge 96047 - Add IPC for DNS host address resolution.

TEST=None
BUG=83242

Review URL: http://codereview.chromium.org/7599003

TBR=sergeyu@chromium.org
Review URL: http://codereview.chromium.org/7587018

git-svn-id: svn://svn.chromium.org/chrome/branches/835/src@96286 0039d316-1c4b-4281-b951-d872f2087c98

9 files changed, 336 insertions, 8 deletions

diff --git a/content/browser/renderer_host/browser_render_process_host.cc b/content/browser/renderer_host/browser_render_process_host.cc
index d93f0f2..45dea6a 100644
--- a/content/browser/renderer_host/browser_render_process_host.cc
+++ b/content/browser/renderer_host/browser_render_process_host.cc
@@ -399,7 +399,8 @@ void BrowserRenderProcessHost::CreateMessageFilters() {
               widget_helper_.get(), &RenderWidgetHelper::GetNextRoutingID)));
 
 #if defined(ENABLE_P2P_APIS)
-  channel_->AddFilter(new P2PSocketDispatcherHost());
+  channel_->AddFilter(new P2PSocketDispatcherHost(
+      &profile()->->GetResourceContext()));
 #endif
 
   channel_->AddFilter(new TraceMessageFilter());
diff --git a/content/browser/renderer_host/p2p/socket_dispatcher_host.cc b/content/browser/renderer_host/p2p/socket_dispatcher_host.cc
index da92782..728556e 100644
--- a/content/browser/renderer_host/p2p/socket_dispatcher_host.cc
+++ b/content/browser/renderer_host/p2p/socket_dispatcher_host.cc
@@ -4,16 +4,105 @@
 
 #include "content/browser/renderer_host/p2p/socket_dispatcher_host.h"
 
+#include "base/bind.h"
 #include "base/stl_util.h"
 #include "content/browser/renderer_host/p2p/socket_host.h"
+#include "content/browser/resource_context.h"
 #include "content/common/p2p_messages.h"
+#include "net/base/address_list.h"
+#include "net/base/completion_callback.h"
+#include "net/base/net_errors.h"
+#include "net/base/net_log.h"
+#include "net/base/single_request_host_resolver.h"
+#include "net/base/sys_addrinfo.h"
 
-P2PSocketDispatcherHost::P2PSocketDispatcherHost()
-    : monitoring_networks_(false) {
+class P2PSocketDispatcherHost::DnsRequest {
+ public:
+  typedef base::Callback<void(const net::IPAddressNumber&)> DoneCallback;
+
+  DnsRequest(int32 routing_id, int32 request_id,
+             net::HostResolver* host_resolver)
+      : routing_id_(routing_id),
+        request_id_(request_id),
+        resolver_(host_resolver),
+        ALLOW_THIS_IN_INITIALIZER_LIST(completion_callback_(
+            this, &P2PSocketDispatcherHost::DnsRequest::OnDone)) {
+  }
+
+  void Resolve(const std::string& host_name,
+               const DoneCallback& done_callback) {
+    DCHECK(!done_callback.is_null());
+
+    host_name_ = host_name;
+    done_callback_ = done_callback;
+
+    // Return an error if it's an empty string.
+    if (host_name_.empty()) {
+      done_callback_.Run(net::IPAddressNumber());
+      return;
+    }
+
+    // Add period at the end to make sure that we only resolve
+    // fully-qualified names.
+    if (host_name_.at(host_name_.size() - 1) != '.')
+      host_name_ = host_name_ + '.';
+
+    net::HostResolver::RequestInfo info(net::HostPortPair(host_name_, 0));
+    resolver_.Resolve(info, &addresses_, &completion_callback_,
+                      net::BoundNetLog());
+  }
+
+  int32 routing_id() { return routing_id_; }
+  int32 request_id() { return request_id_; }
+
+ private:
+  void OnDone(int result) {
+    if (result != net::OK) {
+      LOG(ERROR) << "Failed to resolve address for " << host_name_
+                 << ", errorcode: " << result;
+      done_callback_.Run(net::IPAddressNumber());
+      return;
+    }
+
+    if (addresses_.head() == NULL) {
+      LOG(ERROR) << "Received 0 addresses when trying to resolve address for "
+                 << host_name_;
+      done_callback_.Run(net::IPAddressNumber());
+      return;
+    }
+
+    net::IPEndPoint end_point;
+    if (!end_point.FromSockAddr(addresses_.head()->ai_addr,
+                                addresses_.head()->ai_addrlen)) {
+      LOG(ERROR) << "Received invalid address for " << host_name_;
+      done_callback_.Run(net::IPAddressNumber());
+      return;
+    }
+
+    done_callback_.Run(end_point.address());
+  }
+
+  int32 routing_id_;
+  int32 request_id_;
+  net::AddressList addresses_;
+
+  std::string host_name_;
+  net::SingleRequestHostResolver resolver_;
+
+  DoneCallback done_callback_;
+
+  net::CompletionCallbackImpl<DnsRequest> completion_callback_;
+};
+
+P2PSocketDispatcherHost::P2PSocketDispatcherHost(
+    const content::ResourceContext* resource_context)
+    : resource_context_(resource_context),
+      monitoring_networks_(false) {
 }
 
 P2PSocketDispatcherHost::~P2PSocketDispatcherHost() {
   DCHECK(sockets_.empty());
+  DCHECK(dns_requests_.empty());
 
   if (monitoring_networks_)
     net::NetworkChangeNotifier::RemoveIPAddressObserver(this);
@@ -25,6 +114,9 @@ void P2PSocketDispatcherHost::OnChannelClosing() {
   // Since the IPC channel is gone, close pending connections.
   STLDeleteContainerPairSecondPointers(sockets_.begin(), sockets_.end());
   sockets_.clear();
+
+  STLDeleteContainerPointers(dns_requests_.begin(), dns_requests_.end());
+  dns_requests_.clear();
 }
 
 void P2PSocketDispatcherHost::OnDestruct() const {
@@ -39,6 +131,7 @@ bool P2PSocketDispatcherHost::OnMessageReceived(const IPC::Message& message,
                         OnStartNetworkNotifications)
     IPC_MESSAGE_HANDLER(P2PHostMsg_StopNetworkNotifications,
                         OnStopNetworkNotifications)
+    IPC_MESSAGE_HANDLER(P2PHostMsg_GetHostAddress, OnGetHostAddress)
     IPC_MESSAGE_HANDLER(P2PHostMsg_CreateSocket, OnCreateSocket)
     IPC_MESSAGE_HANDLER(P2PHostMsg_AcceptIncomingTcpConnection,
                         OnAcceptIncomingTcpConnection)
@@ -101,6 +194,27 @@ void P2PSocketDispatcherHost::SendNetworkList(
   }
 }
 
+void P2PSocketDispatcherHost::OnGetHostAddress(const IPC::Message& msg,
+                                               const std::string& host_name,
+                                               int32 request_id) {
+  DnsRequest* request = new DnsRequest(
+      msg.routing_id(), request_id, resource_context_->host_resolver());
+  request->Resolve(host_name, base::Bind(
+      &P2PSocketDispatcherHost::OnAddressResolved,
+      base::Unretained(this), request));
+  dns_requests_.insert(request);
+}
+
+void P2PSocketDispatcherHost::OnAddressResolved(
+    DnsRequest* request,
+    const net::IPAddressNumber& result) {
+  Send(new P2PMsg_GetHostAddressResult(
+      request->routing_id(), request->request_id(), result));
+
+  dns_requests_.erase(request);
+  delete request;
+}
+
 void P2PSocketDispatcherHost::OnCreateSocket(
     const IPC::Message& msg, P2PSocketType type, int socket_id,
     const net::IPEndPoint& local_address,
diff --git a/content/browser/renderer_host/p2p/socket_dispatcher_host.h b/content/browser/renderer_host/p2p/socket_dispatcher_host.h
index e704e9d..54a91c6 100644
--- a/content/browser/renderer_host/p2p/socket_dispatcher_host.h
+++ b/content/browser/renderer_host/p2p/socket_dispatcher_host.h
@@ -12,13 +12,17 @@
 #include "net/base/ip_endpoint.h"
 #include "net/base/network_change_notifier.h"
 
+namespace content {
+class ResourceContext;
+}  // namespace content
+
 class P2PSocketHost;
 
 class P2PSocketDispatcherHost
     : public BrowserMessageFilter,
       public net::NetworkChangeNotifier::IPAddressObserver {
  public:
-  P2PSocketDispatcherHost();
+  P2PSocketDispatcherHost(const content::ResourceContext* resource_context);
   virtual ~P2PSocketDispatcherHost();
 
   // BrowserMessageFilter overrides.
@@ -34,12 +38,18 @@ class P2PSocketDispatcherHost
   typedef std::pair<int32, int> ExtendedSocketId;
   typedef std::map<ExtendedSocketId, P2PSocketHost*> SocketsMap;
 
+  class DnsRequest;
+
   P2PSocketHost* LookupSocket(int32 routing_id, int socket_id);
 
   // Handlers for the messages coming from the renderer.
   void OnStartNetworkNotifications(const IPC::Message& msg);
   void OnStopNetworkNotifications(const IPC::Message& msg);
 
+  void OnGetHostAddress(const IPC::Message& msg,
+                        const std::string& host_name,
+                        int32 request_id);
+
   void OnCreateSocket(const IPC::Message& msg,
                       P2PSocketType type,
                       int socket_id,
@@ -57,6 +67,11 @@ class P2PSocketDispatcherHost
   void DoGetNetworkList();
   void SendNetworkList(const net::NetworkInterfaceList& list);
 
+  void OnAddressResolved(DnsRequest* request,
+                         const net::IPAddressNumber& result);
+
+  const content::ResourceContext* resource_context_;
+
   SocketsMap sockets_;
 
   bool monitoring_networks_;
@@ -65,6 +80,8 @@ class P2PSocketDispatcherHost
   // network list notifications.
   std::set<int> notifications_routing_ids_;
 
+  std::set<DnsRequest*> dns_requests_;
+
   DISALLOW_COPY_AND_ASSIGN(P2PSocketDispatcherHost);
 };
 
diff --git a/content/common/p2p_messages.h b/content/common/p2p_messages.h
index cf6ddca..7f2ec2e 100644
--- a/content/common/p2p_messages.h
+++ b/content/common/p2p_messages.h
@@ -24,6 +24,10 @@ IPC_STRUCT_TRAITS_END()
 IPC_MESSAGE_ROUTED1(P2PMsg_NetworkListChanged,
                     net::NetworkInterfaceList /* networks */)
 
+IPC_MESSAGE_ROUTED2(P2PMsg_GetHostAddressResult,
+                    int32 /* request_id */,
+                    net::IPAddressNumber /* address */)
+
 IPC_MESSAGE_ROUTED2(P2PMsg_OnSocketCreated,
                     int /* socket_id */,
                     net::IPEndPoint /* socket_address */)
@@ -47,6 +51,10 @@ IPC_MESSAGE_ROUTED3(P2PMsg_OnDataReceived,
 IPC_MESSAGE_ROUTED0(P2PHostMsg_StartNetworkNotifications)
 IPC_MESSAGE_ROUTED0(P2PHostMsg_StopNetworkNotifications)
 
+IPC_MESSAGE_ROUTED2(P2PHostMsg_GetHostAddress,
+                    std::string /* host_name */,
+                    int32 /* request_id */)
+
 IPC_MESSAGE_ROUTED4(P2PHostMsg_CreateSocket,
                     P2PSocketType /* type */,
                     int /* socket_id */,
diff --git a/content/content_renderer.gypi b/content/content_renderer.gypi
index 64c2f8a..10e0c69 100644
--- a/content/content_renderer.gypi
+++ b/content/content_renderer.gypi
@@ -179,6 +179,8 @@
       'conditions': [
         ['p2p_apis==1', {
           'sources': [
+            'renderer/p2p/host_address_request.cc',
+            'renderer/p2p/host_address_request.h',
             'renderer/p2p/ipc_network_manager.cc',
             'renderer/p2p/ipc_network_manager.h',
             'renderer/p2p/ipc_socket_factory.cc',
diff --git a/content/renderer/p2p/host_address_request.cc b/content/renderer/p2p/host_address_request.cc
new file mode 100644
index 0000000..92b9f33
--- /dev/null
+++ b/content/renderer/p2p/host_address_request.cc
@@ -0,0 +1,77 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "content/renderer/p2p/host_address_request.h"
+
+#include "base/message_loop_proxy.h"
+#include "content/common/p2p_messages.h"
+#include "content/renderer/p2p/socket_dispatcher.h"
+
+P2PHostAddressRequest::P2PHostAddressRequest(P2PSocketDispatcher* dispatcher)
+    : dispatcher_(dispatcher),
+      ipc_message_loop_(dispatcher->message_loop()),
+      delegate_message_loop_(base::MessageLoopProxy::CreateForCurrentThread()),
+      state_(STATE_CREATED),
+      request_id_(0),
+      registered_(false) {
+}
+
+P2PHostAddressRequest::~P2PHostAddressRequest() {
+  DCHECK(state_ == STATE_CREATED || state_ == STATE_FINISHED);
+}
+
+void P2PHostAddressRequest::Request(const std::string& host_name,
+                                    const DoneCallback& done_callback) {
+  DCHECK(delegate_message_loop_->BelongsToCurrentThread());
+
+  state_ = STATE_SENT;
+  ipc_message_loop_->PostTask(FROM_HERE, NewRunnableMethod(
+      this, &P2PHostAddressRequest::DoSendRequest, host_name, done_callback));
+}
+
+void P2PHostAddressRequest::Cancel() {
+  DCHECK(delegate_message_loop_->BelongsToCurrentThread());
+
+  if (state_ != STATE_FINISHED) {
+    state_ = STATE_FINISHED;
+    ipc_message_loop_->PostTask(FROM_HERE, NewRunnableMethod(
+        this, &P2PHostAddressRequest::DoUnregister));
+  }
+}
+
+void P2PHostAddressRequest::DoSendRequest(const std::string& host_name,
+                                          const DoneCallback& done_callback) {
+  DCHECK(ipc_message_loop_->BelongsToCurrentThread());
+
+  done_callback_ = done_callback;
+  request_id_ = dispatcher_->RegisterHostAddressRequest(this);
+  registered_ = true;
+  dispatcher_->SendP2PMessage(
+      new P2PHostMsg_GetHostAddress(0, host_name, request_id_));
+}
+
+void P2PHostAddressRequest::DoUnregister() {
+  DCHECK(ipc_message_loop_->BelongsToCurrentThread());
+  if (registered_) {
+    dispatcher_->UnregisterHostAddressRequest(request_id_);
+    registered_ = false;
+  }
+}
+
+void P2PHostAddressRequest::OnResponse(const net::IPAddressNumber& address) {
+  DCHECK(ipc_message_loop_->BelongsToCurrentThread());
+  delegate_message_loop_->PostTask(FROM_HERE, NewRunnableMethod(
+      this, &P2PHostAddressRequest::DeliverResponse, address));
+  dispatcher_->UnregisterHostAddressRequest(request_id_);
+  registered_ = false;
+}
+
+void P2PHostAddressRequest::DeliverResponse(
+    const net::IPAddressNumber& address) {
+  DCHECK(delegate_message_loop_->BelongsToCurrentThread());
+  if (state_ == STATE_SENT) {
+    done_callback_.Run(address);
+    state_ = STATE_FINISHED;
+  }
+}
diff --git a/content/renderer/p2p/host_address_request.h b/content/renderer/p2p/host_address_request.h
new file mode 100644
index 0000000..14a5ae0
--- /dev/null
+++ b/content/renderer/p2p/host_address_request.h
@@ -0,0 +1,68 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CONTENT_RENDERER_P2P_HOST_ADDRESS_REQUEST_H_
+#define CONTENT_RENDERER_P2P_HOST_ADDRESS_REQUEST_H_
+
+#include <string>
+
+#include "base/callback.h"
+#include "base/memory/ref_counted.h"
+#include "net/base/net_util.h"
+
+namespace base {
+class MessageLoopProxy;
+}  // namespace base
+
+class P2PSocketDispatcher;
+
+class P2PHostAddressRequest :
+    public base::RefCountedThreadSafe<P2PHostAddressRequest>  {
+ public:
+  typedef base::Callback<void(const net::IPAddressNumber&)> DoneCallback;
+
+  P2PHostAddressRequest(P2PSocketDispatcher* dispatcher);
+
+  // Sends host address request.
+  void Request(const std::string& host_name,
+               const DoneCallback& done_callback);
+
+  // Cancels the request. The callback passed to Request() will not be
+  // called after Cancel() is called.
+  void Cancel();
+
+ private:
+  enum State {
+    STATE_CREATED,
+    STATE_SENT,
+    STATE_FINISHED,
+  };
+
+  friend class P2PSocketDispatcher;
+
+  friend class base::RefCountedThreadSafe<P2PHostAddressRequest>;
+  virtual ~P2PHostAddressRequest();
+
+  void DoSendRequest(const std::string& host_name,
+                     const DoneCallback& done_callback);
+  void DoUnregister();
+  void OnResponse(const net::IPAddressNumber& address);
+  void DeliverResponse(const net::IPAddressNumber& address);
+
+  P2PSocketDispatcher* dispatcher_;
+  scoped_refptr<base::MessageLoopProxy> ipc_message_loop_;
+  scoped_refptr<base::MessageLoopProxy> delegate_message_loop_;
+  DoneCallback done_callback_;
+
+  // State must be accessed from delegate thread only.
+  State state_;
+
+  // Accessed on the IPC thread only.
+  int32 request_id_;
+  bool registered_;
+
+  DISALLOW_COPY_AND_ASSIGN(P2PHostAddressRequest);
+};
+
+#endif  // CONTENT_RENDERER_P2P_HOST_ADDRESS_REQUEST_H_
diff --git a/content/renderer/p2p/socket_dispatcher.cc b/content/renderer/p2p/socket_dispatcher.cc
index 43c9de3..ba00e99 100644
--- a/content/renderer/p2p/socket_dispatcher.cc
+++ b/content/renderer/p2p/socket_dispatcher.cc
@@ -6,6 +6,8 @@
 
 #include "base/message_loop_proxy.h"
 #include "content/common/p2p_messages.h"
+#include "content/renderer/p2p/host_address_request.h"
+#include "content/renderer/p2p/socket_client.h"
 
 P2PSocketDispatcher::P2PSocketDispatcher(RenderView* render_view)
     : RenderViewObserver(render_view),
@@ -42,6 +44,7 @@ bool P2PSocketDispatcher::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(P2PSocketDispatcher, message)
     IPC_MESSAGE_HANDLER(P2PMsg_NetworkListChanged, OnNetworkListChanged)
+    IPC_MESSAGE_HANDLER(P2PMsg_GetHostAddressResult, OnGetHostAddressResult)
     IPC_MESSAGE_HANDLER(P2PMsg_OnSocketCreated, OnSocketCreated)
     IPC_MESSAGE_HANDLER(P2PMsg_OnIncomingTcpConnection, OnIncomingTcpConnection)
     IPC_MESSAGE_HANDLER(P2PMsg_OnError, OnError)
@@ -51,6 +54,10 @@ bool P2PSocketDispatcher::OnMessageReceived(const IPC::Message& message) {
   return handled;
 }
 
+base::MessageLoopProxy* P2PSocketDispatcher::message_loop() {
+  return message_loop_;
+}
+
 int P2PSocketDispatcher::RegisterClient(P2PSocketClient* client) {
   return clients_.Add(client);
 }
@@ -64,8 +71,13 @@ void P2PSocketDispatcher::SendP2PMessage(IPC::Message* msg) {
   Send(msg);
 }
 
-base::MessageLoopProxy* P2PSocketDispatcher::message_loop() {
-  return message_loop_;
+int P2PSocketDispatcher::RegisterHostAddressRequest(
+    P2PHostAddressRequest* request) {
+  return host_address_requests_.Add(request);
+}
+
+void P2PSocketDispatcher::UnregisterHostAddressRequest(int id) {
+  host_address_requests_.Remove(id);
 }
 
 void P2PSocketDispatcher::OnNetworkListChanged(
@@ -74,6 +86,18 @@ void P2PSocketDispatcher::OnNetworkListChanged(
                                   networks);
 }
 
+void P2PSocketDispatcher::OnGetHostAddressResult(
+    int32 request_id,
+    const net::IPAddressNumber& address) {
+  P2PHostAddressRequest* request = host_address_requests_.Lookup(request_id);
+  if (!request) {
+    VLOG(1) << "Received P2P message for socket that doesn't exist.";
+    return;
+  }
+
+  request->OnResponse(address);
+}
+
 void P2PSocketDispatcher::OnSocketCreated(
     int socket_id, const net::IPEndPoint& address) {
   P2PSocketClient* client = GetClient(socket_id);
diff --git a/content/renderer/p2p/socket_dispatcher.h b/content/renderer/p2p/socket_dispatcher.h
index c4b71cd..3dbc49d 100644
--- a/content/renderer/p2p/socket_dispatcher.h
+++ b/content/renderer/p2p/socket_dispatcher.h
@@ -27,13 +27,20 @@
 #include "base/observer_list_threadsafe.h"
 #include "base/synchronization/lock.h"
 #include "content/common/p2p_sockets.h"
-#include "content/renderer/p2p/socket_client.h"
 #include "content/renderer/render_view_observer.h"
+#include "net/base/net_util.h"
 
 namespace base {
 class MessageLoopProxy;
 }  // namespace base
 
+namespace net {
+class IPEndPoint;
+}  // namespace net
+
+class P2PHostAddressRequest;
+class P2PSocketClient;
+
 // P2PSocketDispatcher works on the renderer thread. It dispatches all
 // messages on that thread, and all its methods must be called on the
 // same thread.
@@ -68,16 +75,24 @@ class P2PSocketDispatcher : public RenderViewObserver {
   virtual bool OnMessageReceived(const IPC::Message& message);
 
  private:
+  friend class P2PHostAddressRequest;
   friend class P2PSocketClient;
 
+  base::MessageLoopProxy* message_loop();
+
   // Called by P2PSocketClient.
   int RegisterClient(P2PSocketClient* client);
   void UnregisterClient(int id);
   void SendP2PMessage(IPC::Message* msg);
-  base::MessageLoopProxy* message_loop();
+
+  // Called by DnsRequest.
+  int RegisterHostAddressRequest(P2PHostAddressRequest* request);
+  void UnregisterHostAddressRequest(int id);
 
   // Incoming message handlers.
   void OnNetworkListChanged(const net::NetworkInterfaceList& networks);
+  void OnGetHostAddressResult(int32 request_id,
+                              const net::IPAddressNumber& address);
   void OnSocketCreated(int socket_id, const net::IPEndPoint& address);
   void OnIncomingTcpConnection(int socket_id, const net::IPEndPoint& address);
   void OnError(int socket_id);
@@ -89,6 +104,8 @@ class P2PSocketDispatcher : public RenderViewObserver {
   scoped_refptr<base::MessageLoopProxy> message_loop_;
   IDMap<P2PSocketClient> clients_;
 
+  IDMap<P2PHostAddressRequest> host_address_requests_;
+
   bool network_notifications_started_;
   scoped_refptr<ObserverListThreadSafe<NetworkListObserver> >
       network_list_observers_;