// Copyright 2012 The Chromium Authors
// 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()));
if (!resource) {
// Host probably still in a pending state, nothing we can do.
return;
}
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();
}
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.
if (!params.has_callback()) {
DLOG(WARNING) << "Expected callback for sync message.";
return;
}
// 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()) {
DLOG(WARNING) << "Resource host creation failed.";
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.
DLOG(WARNING) << "Bad pending host ID = " << pending_host_id;
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()) {
DLOG(WARNING) << "Unknown resource ID " << resource;
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
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