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// 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 "build/build_config.h"
#include "base/files/file_path.h"
#include "base/files/file_util_proxy.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "base/message_loop/message_loop.h"
#include "base/process/process.h"
#include "components/nacl/common/nacl_types.h"
#include "content/public/browser/browser_child_process_host_delegate.h"
#include "content/public/browser/browser_child_process_host_iterator.h"
#include "ipc/ipc_channel_handle.h"
#include "net/socket/socket_descriptor.h"
#include "ppapi/shared_impl/ppapi_permissions.h"
#include "url/gurl.h"
namespace content {
class BrowserChildProcessHost;
class BrowserPpapiHost;
namespace IPC {
class ChannelProxy;
namespace nacl {
class NaClHostMessageFilter;
void* AllocateAddressSpaceASLR(base::ProcessHandle process, size_t size);
// Represents the browser side of the browser <--> NaCl communication
// channel. There will be one NaClProcessHost per NaCl process
// The browser is responsible for starting the NaCl process
// when requested by the renderer.
// After that, most of the communication is directly between NaCl plugin
// running in the renderer and NaCl processes.
class NaClProcessHost : public content::BrowserChildProcessHostDelegate {
// manifest_url: the URL of the manifest of the Native Client plugin being
// executed.
// permissions: PPAPI permissions, to control access to private APIs.
// render_view_id: RenderView routing id, to control access to private APIs.
// permission_bits: controls which interfaces the NaCl plugin can use.
// uses_irt: whether the launched process should use the IRT.
// uses_nonsfi_mode: whether the program should be loaded under non-SFI mode.
// enable_dyncode_syscalls: whether the launched process should allow dyncode
// and mmap with PROT_EXEC.
// enable_exception_handling: whether the launched process should allow
// hardware exception handling.
// enable_crash_throttling: whether a crash of this process contributes
// to the crash throttling statistics, and also
// whether this process should not start when too
// many crashes have been observed.
// off_the_record: was the process launched from an incognito renderer?
// profile_directory: is the path of current profile directory.
NaClProcessHost(const GURL& manifest_url,
ppapi::PpapiPermissions permissions,
int render_view_id,
uint32 permission_bits,
bool uses_irt,
bool uses_nonsfi_mode,
bool enable_dyncode_syscalls,
bool enable_exception_handling,
bool enable_crash_throttling,
bool off_the_record,
const base::FilePath& profile_directory);
virtual ~NaClProcessHost();
virtual void OnProcessCrashed(int exit_status) OVERRIDE;
// Do any minimal work that must be done at browser startup.
static void EarlyStartup();
// Specifies throttling time in milliseconds for PpapiHostMsg_Keepalive IPCs.
static void SetPpapiKeepAliveThrottleForTesting(unsigned milliseconds);
// Initialize the new NaCl process. Result is returned by sending ipc
// message reply_msg.
void Launch(NaClHostMessageFilter* nacl_host_message_filter,
IPC::Message* reply_msg,
const base::FilePath& manifest_path);
virtual void OnChannelConnected(int32 peer_pid) OVERRIDE;
#if defined(OS_WIN)
void OnProcessLaunchedByBroker(base::ProcessHandle handle);
void OnDebugExceptionHandlerLaunchedByBroker(bool success);
bool Send(IPC::Message* msg);
content::BrowserChildProcessHost* process() { return process_.get(); }
content::BrowserPpapiHost* browser_ppapi_host() { return ppapi_host_.get(); }
// Internal class that holds the NaClHandle objecs so that
// nacl_process_host.h doesn't include NaCl headers. Needed since it's
// included by src\content, which can't depend on the NaCl gyp file because it
// depends on chrome.gyp (circular dependency).
struct NaClInternal;
bool LaunchNaClGdb();
// Mark the process as using a particular GDB debug stub port and notify
// listeners (if the port is not kGdbDebugStubPortUnknown).
void SetDebugStubPort(int port);
#if defined(OS_POSIX)
// Create bound TCP socket in the browser process so that the NaCl GDB debug
// stub can use it to accept incoming connections even when the Chrome sandbox
// is enabled.
net::SocketDescriptor GetDebugStubSocketHandle();
#if defined(OS_WIN)
// Called when the debug stub port has been selected.
void OnDebugStubPortSelected(uint16_t debug_stub_port);
bool LaunchSelLdr();
// BrowserChildProcessHostDelegate implementation:
virtual bool OnMessageReceived(const IPC::Message& msg) OVERRIDE;
virtual void OnProcessLaunched() OVERRIDE;
void OnResourcesReady();
// Enable the PPAPI proxy only for NaCl processes corresponding to a renderer.
bool enable_ppapi_proxy() { return render_view_id_ != 0; }
// Sends the reply message to the renderer who is waiting for the plugin
// to load. Returns true on success.
bool ReplyToRenderer(
const IPC::ChannelHandle& ppapi_channel_handle,
const IPC::ChannelHandle& trusted_channel_handle,
const IPC::ChannelHandle& manifest_service_channel_handle);
// Sends the reply with error message to the renderer.
void SendErrorToRenderer(const std::string& error_message);
// Sends the reply message to the renderer. Either result or
// error message must be empty.
void SendMessageToRenderer(const NaClLaunchResult& result,
const std::string& error_message);
// Sends the message to the NaCl process to load the plugin. Returns true
// on success.
bool StartNaClExecution();
// Does post-process-launching tasks for starting the NaCl process once
// we have a connection.
// Returns false on failure.
bool StartWithLaunchedProcess();
// Message handlers for validation caching.
void OnQueryKnownToValidate(const std::string& signature, bool* result);
void OnSetKnownToValidate(const std::string& signature);
void OnResolveFileToken(uint64 file_token_lo, uint64 file_token_hi,
IPC::Message* reply_msg);
void FileResolved(const base::FilePath& file_path,
IPC::Message* reply_msg,
base::File file);
#if defined(OS_WIN)
// Message handler for Windows hardware exception handling.
void OnAttachDebugExceptionHandler(const std::string& info,
IPC::Message* reply_msg);
bool AttachDebugExceptionHandler(const std::string& info,
IPC::Message* reply_msg);
// Called when the PPAPI IPC channels to the browser/renderer have been
// created.
void OnPpapiChannelsCreated(
const IPC::ChannelHandle& browser_channel_handle,
const IPC::ChannelHandle& ppapi_renderer_channel_handle,
const IPC::ChannelHandle& trusted_renderer_channel_handle,
const IPC::ChannelHandle& manifest_service_channel_handle);
GURL manifest_url_;
ppapi::PpapiPermissions permissions_;
#if defined(OS_WIN)
// This field becomes true when the broker successfully launched
// the NaCl loader.
bool process_launched_by_broker_;
// The NaClHostMessageFilter that requested this NaCl process. We use
// this for sending the reply once the process has started.
scoped_refptr<NaClHostMessageFilter> nacl_host_message_filter_;
// The reply message to send. We must always send this message when the
// sub-process either succeeds or fails to unblock the renderer waiting for
// the reply. NULL when there is no reply to send.
IPC::Message* reply_msg_;
#if defined(OS_WIN)
bool debug_exception_handler_requested_;
scoped_ptr<IPC::Message> attach_debug_exception_handler_reply_msg_;
// The file path to the manifest is passed to nacl-gdb when it is used to
// debug the NaCl loader.
base::FilePath manifest_path_;
// Socket pairs for the NaCl process and renderer.
scoped_ptr<NaClInternal> internal_;
base::WeakPtrFactory<NaClProcessHost> weak_factory_;
scoped_ptr<content::BrowserChildProcessHost> process_;
bool uses_irt_;
bool uses_nonsfi_mode_;
bool enable_debug_stub_;
bool enable_dyncode_syscalls_;
bool enable_exception_handling_;
bool enable_crash_throttling_;
bool off_the_record_;
const base::FilePath profile_directory_;
// Channel proxy to terminate the NaCl-Browser PPAPI channel.
scoped_ptr<IPC::ChannelProxy> ipc_proxy_channel_;
// Browser host for plugin process.
scoped_ptr<content::BrowserPpapiHost> ppapi_host_;
int render_view_id_;
// Throttling time in milliseconds for PpapiHostMsg_Keepalive IPCs.
static unsigned keepalive_throttle_interval_milliseconds_;
} // namespace nacl