| // Copyright (c) 2012 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 "ppapi/host/ppapi_host.h" |
| |
| #include <stddef.h> |
| |
| #include <utility> |
| |
| #include "base/check.h" |
| #include "base/notreached.h" |
| #include "ppapi/c/pp_errors.h" |
| #include "ppapi/host/host_factory.h" |
| #include "ppapi/host/host_message_context.h" |
| #include "ppapi/host/instance_message_filter.h" |
| #include "ppapi/host/resource_host.h" |
| #include "ppapi/proxy/ppapi_messages.h" |
| #include "ppapi/proxy/resource_message_params.h" |
| #include "ppapi/proxy/serialized_handle.h" |
| #include "ppapi/shared_impl/host_resource.h" |
| |
| namespace ppapi { |
| namespace host { |
| |
| using proxy::SerializedHandle; |
| |
| namespace { |
| |
| // Put a cap on the maximum number of resources so we don't explode if the |
| // renderer starts spamming us. |
| const size_t kMaxResourcesPerPlugin = 1 << 14; |
| |
| } // namespace |
| |
| PpapiHost::PpapiHost(IPC::Sender* sender, |
| const PpapiPermissions& perms) |
| : sender_(sender), |
| permissions_(perms), |
| next_pending_resource_host_id_(1) { |
| } |
| |
| PpapiHost::~PpapiHost() { |
| // Delete these explicitly before destruction since then the host is still |
| // technically alive in case one of the filters accesses us from the |
| // destructor. |
| instance_message_filters_.clear(); |
| |
| // The resources may also want to use us in their destructors. |
| resources_.clear(); |
| pending_resource_hosts_.clear(); |
| } |
| |
| bool PpapiHost::Send(IPC::Message* msg) { |
| return sender_->Send(msg); |
| } |
| |
| bool PpapiHost::OnMessageReceived(const IPC::Message& msg) { |
| bool handled = true; |
| IPC_BEGIN_MESSAGE_MAP(PpapiHost, msg) |
| IPC_MESSAGE_HANDLER(PpapiHostMsg_ResourceCall, |
| OnHostMsgResourceCall) |
| IPC_MESSAGE_HANDLER(PpapiHostMsg_InProcessResourceCall, |
| OnHostMsgInProcessResourceCall) |
| IPC_MESSAGE_HANDLER_DELAY_REPLY(PpapiHostMsg_ResourceSyncCall, |
| OnHostMsgResourceSyncCall) |
| IPC_MESSAGE_HANDLER(PpapiHostMsg_ResourceCreated, |
| OnHostMsgResourceCreated) |
| IPC_MESSAGE_HANDLER(PpapiHostMsg_AttachToPendingHost, |
| OnHostMsgAttachToPendingHost) |
| IPC_MESSAGE_HANDLER(PpapiHostMsg_ResourceDestroyed, |
| OnHostMsgResourceDestroyed) |
| IPC_MESSAGE_UNHANDLED(handled = false) |
| IPC_END_MESSAGE_MAP() |
| |
| if (!handled) { |
| for (size_t i = 0; i < instance_message_filters_.size(); i++) { |
| if (instance_message_filters_[i]->OnInstanceMessageReceived(msg)) { |
| handled = true; |
| break; |
| } |
| } |
| } |
| |
| return handled; |
| } |
| |
| void PpapiHost::SendReply(const ReplyMessageContext& context, |
| const IPC::Message& msg) { |
| TRACE_EVENT2("ppapi_proxy", "PpapiHost::SendReply", "Class", |
| IPC_MESSAGE_ID_CLASS(msg.type()), "Line", |
| IPC_MESSAGE_ID_LINE(msg.type())); |
| if (context.sync_reply_msg) { |
| PpapiHostMsg_ResourceSyncCall::WriteReplyParams(context.sync_reply_msg, |
| context.params, msg); |
| Send(context.sync_reply_msg); |
| } else { |
| if (context.routing_id != MSG_ROUTING_NONE) { |
| Send(new PpapiHostMsg_InProcessResourceReply(context.routing_id, |
| context.params, |
| msg)); |
| } else { |
| Send(new PpapiPluginMsg_ResourceReply(context.params, msg)); |
| } |
| } |
| } |
| |
| void PpapiHost::SendUnsolicitedReply(PP_Resource resource, |
| const IPC::Message& msg) { |
| std::vector<SerializedHandle> empty; |
| SendUnsolicitedReplyWithHandles(resource, msg, &empty); |
| } |
| |
| void PpapiHost::SendUnsolicitedReplyWithHandles( |
| PP_Resource resource, |
| const IPC::Message& msg, |
| std::vector<SerializedHandle>* handles) { |
| TRACE_EVENT2("ppapi_proxy", "PpapiHost::SendUnsolicitedReplyWithHandles", |
| "Class", IPC_MESSAGE_ID_CLASS(msg.type()), "Line", |
| IPC_MESSAGE_ID_LINE(msg.type())); |
| DCHECK(resource); // If this fails, host is probably pending. |
| proxy::ResourceMessageReplyParams params(resource, 0); |
| for (auto& handle : *handles) |
| params.AppendHandle(std::move(handle)); |
| Send(new PpapiPluginMsg_ResourceReply(params, msg)); |
| } |
| |
| std::unique_ptr<ResourceHost> PpapiHost::CreateResourceHost( |
| PP_Resource resource, |
| PP_Instance instance, |
| const IPC::Message& nested_msg) { |
| std::unique_ptr<ResourceHost> resource_host; |
| DCHECK(!host_factory_filters_.empty()); // Caller forgot to add a factory. |
| for (size_t i = 0; i < host_factory_filters_.size(); i++) { |
| resource_host = host_factory_filters_[i]->CreateResourceHost( |
| this, resource, instance, nested_msg); |
| if (resource_host.get()) |
| break; |
| } |
| return resource_host; |
| } |
| |
| int PpapiHost::AddPendingResourceHost( |
| std::unique_ptr<ResourceHost> resource_host) { |
| // The resource ID should not be assigned. |
| if (!resource_host.get() || resource_host->pp_resource() != 0) { |
| NOTREACHED(); |
| return 0; |
| } |
| |
| if (pending_resource_hosts_.size() + resources_.size() |
| >= kMaxResourcesPerPlugin) { |
| return 0; |
| } |
| |
| int pending_id = next_pending_resource_host_id_++; |
| pending_resource_hosts_[pending_id] = std::move(resource_host); |
| return pending_id; |
| } |
| |
| void PpapiHost::AddHostFactoryFilter(std::unique_ptr<HostFactory> filter) { |
| host_factory_filters_.push_back(std::move(filter)); |
| } |
| |
| void PpapiHost::AddInstanceMessageFilter( |
| std::unique_ptr<InstanceMessageFilter> filter) { |
| instance_message_filters_.push_back(std::move(filter)); |
| } |
| |
| void PpapiHost::OnHostMsgResourceCall( |
| const proxy::ResourceMessageCallParams& params, |
| const IPC::Message& nested_msg) { |
| TRACE_EVENT2("ppapi_proxy", "PpapiHost::OnHostMsgResourceCall", "Class", |
| IPC_MESSAGE_ID_CLASS(nested_msg.type()), "Line", |
| IPC_MESSAGE_ID_LINE(nested_msg.type())); |
| HostMessageContext context(params); |
| HandleResourceCall(params, nested_msg, &context); |
| } |
| |
| void PpapiHost::OnHostMsgInProcessResourceCall( |
| int routing_id, |
| const proxy::ResourceMessageCallParams& params, |
| const IPC::Message& nested_msg) { |
| TRACE_EVENT2("ppapi_proxy", "PpapiHost::OnHostMsgInProcessResourceCall", |
| "Class", IPC_MESSAGE_ID_CLASS(nested_msg.type()), "Line", |
| IPC_MESSAGE_ID_LINE(nested_msg.type())); |
| HostMessageContext context(routing_id, params); |
| HandleResourceCall(params, nested_msg, &context); |
| } |
| |
| void PpapiHost::OnHostMsgResourceSyncCall( |
| const proxy::ResourceMessageCallParams& params, |
| const IPC::Message& nested_msg, |
| IPC::Message* reply_msg) { |
| TRACE_EVENT2("ppapi_proxy", "PpapiHost::OnHostMsgResourceSyncCall", "Class", |
| IPC_MESSAGE_ID_CLASS(nested_msg.type()), "Line", |
| IPC_MESSAGE_ID_LINE(nested_msg.type())); |
| // Sync messages should always have callback set because they always expect |
| // a reply from the host. |
| DCHECK(params.has_callback()); |
| // Stash the |reply_msg| in the context so that it can be used to reply |
| // to the sync message. |
| HostMessageContext context(params, reply_msg); |
| HandleResourceCall(params, nested_msg, &context); |
| } |
| |
| void PpapiHost::HandleResourceCall( |
| const proxy::ResourceMessageCallParams& params, |
| const IPC::Message& nested_msg, |
| HostMessageContext* context) { |
| ResourceHost* resource_host = GetResourceHost(params.pp_resource()); |
| if (resource_host) { |
| // CAUTION: Handling the message may cause the destruction of this object. |
| resource_host->HandleMessage(nested_msg, context); |
| } else { |
| if (context->params.has_callback()) { |
| ReplyMessageContext reply_context = context->MakeReplyMessageContext(); |
| reply_context.params.set_result(PP_ERROR_BADRESOURCE); |
| SendReply(reply_context, context->reply_msg); |
| } |
| } |
| } |
| |
| void PpapiHost::OnHostMsgResourceCreated( |
| const proxy::ResourceMessageCallParams& params, |
| PP_Instance instance, |
| const IPC::Message& nested_msg) { |
| TRACE_EVENT2("ppapi_proxy", "PpapiHost::OnHostMsgResourceCreated", "Class", |
| IPC_MESSAGE_ID_CLASS(nested_msg.type()), "Line", |
| IPC_MESSAGE_ID_LINE(nested_msg.type())); |
| |
| if (pending_resource_hosts_.size() + resources_.size() |
| >= kMaxResourcesPerPlugin) { |
| return; |
| } |
| |
| // Run through all filters until one grabs this message. |
| std::unique_ptr<ResourceHost> resource_host = |
| CreateResourceHost(params.pp_resource(), instance, nested_msg); |
| |
| if (!resource_host.get()) { |
| NOTREACHED(); |
| return; |
| } |
| |
| // Resource should have been assigned a nonzero PP_Resource. |
| DCHECK(resource_host->pp_resource()); |
| |
| resources_[params.pp_resource()] = std::move(resource_host); |
| } |
| |
| void PpapiHost::OnHostMsgAttachToPendingHost(PP_Resource pp_resource, |
| int pending_host_id) { |
| PendingHostResourceMap::iterator found = |
| pending_resource_hosts_.find(pending_host_id); |
| if (found == pending_resource_hosts_.end()) { |
| // Plugin sent a bad ID. |
| NOTREACHED(); |
| return; |
| } |
| found->second->SetPPResourceForPendingHost(pp_resource); |
| resources_[pp_resource] = std::move(found->second); |
| pending_resource_hosts_.erase(found); |
| } |
| |
| void PpapiHost::OnHostMsgResourceDestroyed(PP_Resource resource) { |
| ResourceMap::iterator found = resources_.find(resource); |
| if (found == resources_.end()) { |
| NOTREACHED(); |
| return; |
| } |
| // Invoking the HostResource destructor might result in looking up the |
| // PP_Resource in resources_. std::map is not well specified as to whether the |
| // element will be there or not. Therefore, we delay destruction of the |
| // HostResource until after we've made sure the map no longer contains |
| // |resource|. |
| std::unique_ptr<ResourceHost> delete_at_end_of_scope( |
| std::move(found->second)); |
| resources_.erase(found); |
| } |
| |
| ResourceHost* PpapiHost::GetResourceHost(PP_Resource resource) const { |
| ResourceMap::const_iterator found = resources_.find(resource); |
| return found == resources_.end() ? NULL : found->second.get(); |
| } |
| |
| } // namespace host |
| } // namespace ppapi |