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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "FileDescriptor.h"
#include "mozilla/Assertions.h"
#include "mozilla/ipc/ProtocolMessageUtils.h"
#include "nsDebug.h"
#ifdef XP_WIN
# include <windows.h>
# include "ProtocolUtils.h"
#else // XP_WIN
# include <unistd.h>
#endif // XP_WIN
namespace mozilla {
namespace ipc {
FileDescriptor::FileDescriptor() = default;
FileDescriptor::FileDescriptor(const FileDescriptor& aOther)
: mHandle(Clone(aOther.mHandle.get())) {}
FileDescriptor::FileDescriptor(FileDescriptor&& aOther)
: mHandle(std::move(aOther.mHandle)) {}
FileDescriptor::FileDescriptor(PlatformHandleType aHandle)
: mHandle(Clone(aHandle)) {}
FileDescriptor::FileDescriptor(UniquePlatformHandle&& aHandle)
: mHandle(std::move(aHandle)) {}
FileDescriptor::FileDescriptor(const IPDLPrivate&, const PickleType& aPickle) {
#ifdef XP_WIN
mHandle.reset(aPickle);
#else
mHandle.reset(aPickle.fd);
#endif
}
FileDescriptor::~FileDescriptor() = default;
FileDescriptor& FileDescriptor::operator=(const FileDescriptor& aOther) {
if (this != &aOther) {
mHandle = Clone(aOther.mHandle.get());
}
return *this;
}
FileDescriptor& FileDescriptor::operator=(FileDescriptor&& aOther) {
if (this != &aOther) {
mHandle = std::move(aOther.mHandle);
}
return *this;
}
FileDescriptor::PickleType FileDescriptor::ShareTo(
const FileDescriptor::IPDLPrivate&,
FileDescriptor::ProcessId aTargetPid) const {
PlatformHandleType newHandle;
#ifdef XP_WIN
if (IsValid()) {
if (mozilla::ipc::DuplicateHandle(mHandle.get(), aTargetPid, &newHandle, 0,
DUPLICATE_SAME_ACCESS)) {
return newHandle;
}
NS_WARNING("Failed to duplicate file handle for other process!");
}
return INVALID_HANDLE_VALUE;
#else // XP_WIN
if (IsValid()) {
newHandle = dup(mHandle.get());
if (newHandle >= 0) {
return base::FileDescriptor(newHandle, /* auto_close */ true);
}
NS_WARNING("Failed to duplicate file handle for other process!");
}
return base::FileDescriptor();
#endif
MOZ_CRASH("Must not get here!");
}
bool FileDescriptor::IsValid() const { return mHandle != nullptr; }
FileDescriptor::UniquePlatformHandle FileDescriptor::ClonePlatformHandle()
const {
return Clone(mHandle.get());
}
FileDescriptor::UniquePlatformHandle FileDescriptor::TakePlatformHandle() {
return UniquePlatformHandle(mHandle.release());
}
bool FileDescriptor::operator==(const FileDescriptor& aOther) const {
return mHandle == aOther.mHandle;
}
// static
FileDescriptor::UniquePlatformHandle FileDescriptor::Clone(
PlatformHandleType aHandle) {
FileDescriptor::PlatformHandleType newHandle;
#ifdef XP_WIN
if (aHandle == INVALID_HANDLE_VALUE || aHandle == nullptr) {
return UniqueFileHandle();
}
if (::DuplicateHandle(GetCurrentProcess(), aHandle, GetCurrentProcess(),
&newHandle, 0, FALSE, DUPLICATE_SAME_ACCESS)) {
return UniqueFileHandle(newHandle);
}
#else // XP_WIN
if (aHandle < 0) {
return UniqueFileHandle();
}
newHandle = dup(aHandle);
if (newHandle >= 0) {
return UniqueFileHandle(newHandle);
}
#endif
NS_WARNING("Failed to duplicate file handle for current process!");
return UniqueFileHandle();
}
void IPDLParamTraits<FileDescriptor>::Write(IPC::Message* aMsg,
IProtocol* aActor,
const FileDescriptor& aParam) {
#ifdef XP_WIN
FileDescriptor::PickleType pfd =
aParam.ShareTo(FileDescriptor::IPDLPrivate(), aActor->OtherPid());
#else
// The pid returned by OtherPID() is only required for Windows to
// send file descriptors. For the use case of the fork server,
// aActor is always null. Since it is only for the special case of
// Windows, here we skip it for other platforms.
FileDescriptor::PickleType pfd =
aParam.ShareTo(FileDescriptor::IPDLPrivate(), 0);
#endif
WriteIPDLParam(aMsg, aActor, pfd);
}
bool IPDLParamTraits<FileDescriptor>::Read(const IPC::Message* aMsg,
PickleIterator* aIter,
IProtocol* aActor,
FileDescriptor* aResult) {
FileDescriptor::PickleType pfd;
if (!ReadIPDLParam(aMsg, aIter, aActor, &pfd)) {
return false;
}
*aResult = FileDescriptor(FileDescriptor::IPDLPrivate(), pfd);
if (!aResult->IsValid()) {
printf_stderr("IPDL protocol Error: Received an invalid file descriptor\n");
}
return true;
}
} // namespace ipc
} // namespace mozilla
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