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// 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/browser/ppapi_broker_process_host.h"
#include "base/command_line.h"
#include "base/file_path.h"
#include "base/process_util.h"
#include "base/utf_string_conversions.h"
#include "content/browser/plugin_service.h"
#include "content/browser/renderer_host/render_message_filter.h"
#include "content/common/content_switches.h"
#include "content/common/pepper_plugin_registry.h"
#include "ipc/ipc_switches.h"
#include "ppapi/proxy/ppapi_messages.h"
PpapiBrokerProcessHost::PpapiBrokerProcessHost()
: BrowserChildProcessHost(ChildProcessInfo::PPAPI_BROKER_PROCESS) {
}
PpapiBrokerProcessHost::~PpapiBrokerProcessHost() {
CancelRequests();
}
bool PpapiBrokerProcessHost::Init(const PepperPluginInfo& info) {
broker_path_ = info.path;
set_name(UTF8ToUTF16(info.name));
set_version(UTF8ToUTF16(info.version));
if (!CreateChannel())
return false;
const CommandLine& browser_command_line = *CommandLine::ForCurrentProcess();
// Use the same launcher mechanism as ppapi plugins.
CommandLine::StringType plugin_launcher =
browser_command_line.GetSwitchValueNative(switches::kPpapiPluginLauncher);
#if defined(OS_LINUX)
int flags = plugin_launcher.empty() ? ChildProcessHost::CHILD_ALLOW_SELF :
ChildProcessHost::CHILD_NORMAL;
#else
int flags = ChildProcessHost::CHILD_NORMAL;
#endif
FilePath exe_path = ChildProcessHost::GetChildPath(flags);
if (exe_path.empty())
return false;
CommandLine* cmd_line = new CommandLine(exe_path);
cmd_line->AppendSwitchASCII(switches::kProcessType,
switches::kPpapiBrokerProcess);
cmd_line->AppendSwitchASCII(switches::kProcessChannelID, channel_id());
if (!plugin_launcher.empty())
cmd_line->PrependWrapper(plugin_launcher);
// On posix, having a plugin launcher means we need to use another process
// instead of just forking the zygote.
Launch(
#if defined(OS_WIN)
FilePath(),
#elif defined(OS_POSIX)
false, // Never use the zygote for the broker.
base::environment_vector(),
#endif
cmd_line);
return true;
}
void PpapiBrokerProcessHost::OpenChannelToPpapiBroker(Client* client) {
if (opening_channel()) {
// The channel is already in the process of being opened. Put
// this "open channel" request into a queue of requests that will
// be run once the channel is open.
pending_requests_.push_back(client);
return;
}
// We already have an open channel, send a request right away to broker.
RequestPpapiBrokerChannel(client);
}
void PpapiBrokerProcessHost::RequestPpapiBrokerChannel(
Client* client) {
base::ProcessHandle process_handle;
int renderer_id;
client->GetChannelInfo(&process_handle, &renderer_id);
// We can't send any sync messages from the browser because it might lead to
// a hang. See the similar code in PluginProcessHost for more description.
PpapiMsg_CreateChannel* msg = new PpapiMsg_CreateChannel(process_handle,
renderer_id);
msg->set_unblock(true);
if (Send(msg))
sent_requests_.push(client);
else
client->OnChannelOpened(base::kNullProcessHandle, IPC::ChannelHandle());
}
bool PpapiBrokerProcessHost::CanShutdown() {
return true;
}
void PpapiBrokerProcessHost::OnProcessLaunched() {
}
bool PpapiBrokerProcessHost::OnMessageReceived(const IPC::Message& msg) {
bool handled = true;
IPC_BEGIN_MESSAGE_MAP(PpapiBrokerProcessHost, msg)
IPC_MESSAGE_HANDLER(PpapiHostMsg_ChannelCreated,
OnRendererPpapiBrokerChannelCreated)
IPC_MESSAGE_UNHANDLED(handled = false)
IPC_END_MESSAGE_MAP()
DCHECK(handled);
return handled;
}
// Called when the browser <--> ppapi broker channel has been established.
void PpapiBrokerProcessHost::OnChannelConnected(int32 peer_pid) {
// This will actually load the ppapi broker. Errors will actually not be
// reported back at this point. Instead, the broker will fail to establish the
// connections when we request them on behalf of the renderer(s).
Send(new PpapiMsg_LoadPlugin(broker_path_));
// Process all pending channel requests from the renderers.
for (size_t i = 0; i < pending_requests_.size(); i++)
RequestPpapiBrokerChannel(pending_requests_[i]);
pending_requests_.clear();
}
// Called when the browser <--> broker channel has an error. This normally
// means the broker has crashed.
void PpapiBrokerProcessHost::OnChannelError() {
// We don't need to notify the renderers that were communicating with the
// broker since they have their own channels which will go into the error
// state at the same time. Instead, we just need to notify any renderers
// that have requested a connection but have not yet received one.
CancelRequests();
}
void PpapiBrokerProcessHost::CancelRequests() {
for (size_t i = 0; i < pending_requests_.size(); i++) {
pending_requests_[i]->OnChannelOpened(base::kNullProcessHandle,
IPC::ChannelHandle());
}
pending_requests_.clear();
while (!sent_requests_.empty()) {
sent_requests_.front()->OnChannelOpened(base::kNullProcessHandle,
IPC::ChannelHandle());
sent_requests_.pop();
}
}
// Called when a new broker <--> renderer channel has been created.
void PpapiBrokerProcessHost::OnRendererPpapiBrokerChannelCreated(
const IPC::ChannelHandle& channel_handle) {
if (sent_requests_.empty())
return;
// All requests should be processed FIFO, so the next item in the
// sent_requests_ queue should be the one that the plugin just created.
Client* client = sent_requests_.front();
sent_requests_.pop();
// Prepare the handle to send to the renderer.
base::ProcessHandle broker_process = GetChildProcessHandle();
#if defined(OS_WIN)
base::ProcessHandle renderer_process;
int renderer_id;
client->GetChannelInfo(&renderer_process, &renderer_id);
base::ProcessHandle renderers_broker_handle = NULL;
::DuplicateHandle(::GetCurrentProcess(), broker_process,
renderer_process, &renderers_broker_handle,
0, FALSE, DUPLICATE_SAME_ACCESS);
#elif defined(OS_POSIX)
// Don't need to duplicate anything on POSIX since it's just a PID.
base::ProcessHandle renderers_broker_handle = broker_process;
#endif
client->OnChannelOpened(renderers_broker_handle, channel_handle);
}
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