gecko/ipc/glue/ProtocolUtils.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: sw=2 ts=8 et :
*/
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/* 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 "base/process_util.h"
#include "mozilla/ipc/MessageChannel.h"
#include "mozilla/ipc/ProtocolUtils.h"
#include "mozilla/ipc/Transport.h"
using namespace base;
using namespace IPC;
namespace mozilla {
namespace ipc {
IToplevelProtocol::~IToplevelProtocol()
{
mOpenActors.clear();
}
void IToplevelProtocol::AddOpenedActor(IToplevelProtocol* aActor)
{
#ifdef DEBUG
for (const IToplevelProtocol* actor = mOpenActors.getFirst();
actor;
actor = actor->getNext()) {
NS_ASSERTION(actor != aActor,
"Open the same protocol for more than one time");
}
#endif
mOpenActors.insertBack(aActor);
}
IToplevelProtocol*
IToplevelProtocol::CloneToplevel(const InfallibleTArray<ProtocolFdMapping>& aFds,
base::ProcessHandle aPeerProcess,
ProtocolCloneContext* aCtx)
{
NS_NOTREACHED("Clone() for this protocol actor is not implemented");
return nullptr;
}
void
IToplevelProtocol::CloneOpenedToplevels(IToplevelProtocol* aTemplate,
const InfallibleTArray<ProtocolFdMapping>& aFds,
base::ProcessHandle aPeerProcess,
ProtocolCloneContext* aCtx)
{
for (IToplevelProtocol* actor = aTemplate->GetFirstOpenedActors();
actor;
actor = actor->getNext()) {
IToplevelProtocol* newactor = actor->CloneToplevel(aFds, aPeerProcess, aCtx);
AddOpenedActor(newactor);
}
}
class ChannelOpened : public IPC::Message
{
public:
ChannelOpened(TransportDescriptor aDescriptor,
ProcessId aOtherProcess,
ProtocolId aProtocol)
: IPC::Message(MSG_ROUTING_CONTROL, // these only go to top-level actors
CHANNEL_OPENED_MESSAGE_TYPE,
PRIORITY_NORMAL)
{
IPC::WriteParam(this, aDescriptor);
IPC::WriteParam(this, aOtherProcess);
IPC::WriteParam(this, static_cast<uint32_t>(aProtocol));
}
static bool Read(const IPC::Message& aMsg,
TransportDescriptor* aDescriptor,
ProcessId* aOtherProcess,
ProtocolId* aProtocol)
{
void* iter = nullptr;
if (!IPC::ReadParam(&aMsg, &iter, aDescriptor) ||
!IPC::ReadParam(&aMsg, &iter, aOtherProcess) ||
!IPC::ReadParam(&aMsg, &iter, reinterpret_cast<uint32_t*>(aProtocol))) {
return false;
}
aMsg.EndRead(iter);
return true;
}
};
bool
Bridge(const PrivateIPDLInterface&,
MessageChannel* aParentChannel, ProcessHandle aParentProcess,
MessageChannel* aChildChannel, ProcessHandle aChildProcess,
ProtocolId aProtocol, ProtocolId aChildProtocol)
{
ProcessId parentId = GetProcId(aParentProcess);
ProcessId childId = GetProcId(aChildProcess);
if (!parentId || !childId) {
return false;
}
TransportDescriptor parentSide, childSide;
if (!CreateTransport(aParentProcess, aChildProcess,
&parentSide, &childSide)) {
return false;
}
if (!aParentChannel->Send(new ChannelOpened(parentSide,
childId,
aProtocol)) ||
!aChildChannel->Send(new ChannelOpened(childSide,
parentId,
aChildProtocol))) {
CloseDescriptor(parentSide);
CloseDescriptor(childSide);
return false;
}
return true;
}
bool
Open(const PrivateIPDLInterface&,
MessageChannel* aOpenerChannel, ProcessHandle aOtherProcess,
Transport::Mode aOpenerMode,
ProtocolId aProtocol, ProtocolId aChildProtocol)
{
bool isParent = (Transport::MODE_SERVER == aOpenerMode);
ProcessHandle thisHandle = GetCurrentProcessHandle();
ProcessHandle parentHandle = isParent ? thisHandle : aOtherProcess;
ProcessHandle childHandle = !isParent ? thisHandle : aOtherProcess;
ProcessId parentId = GetProcId(parentHandle);
ProcessId childId = GetProcId(childHandle);
if (!parentId || !childId) {
return false;
}
TransportDescriptor parentSide, childSide;
if (!CreateTransport(parentHandle, childHandle,
&parentSide, &childSide)) {
return false;
}
Message* parentMsg = new ChannelOpened(parentSide, childId, aProtocol);
Message* childMsg = new ChannelOpened(childSide, parentId, aChildProtocol);
nsAutoPtr<Message> messageForUs(isParent ? parentMsg : childMsg);
nsAutoPtr<Message> messageForOtherSide(!isParent ? parentMsg : childMsg);
if (!aOpenerChannel->Echo(messageForUs.forget()) ||
!aOpenerChannel->Send(messageForOtherSide.forget())) {
CloseDescriptor(parentSide);
CloseDescriptor(childSide);
return false;
}
return true;
}
bool
UnpackChannelOpened(const PrivateIPDLInterface&,
const Message& aMsg,
TransportDescriptor* aTransport,
ProcessId* aOtherProcess,
ProtocolId* aProtocol)
{
return ChannelOpened::Read(aMsg, aTransport, aOtherProcess, aProtocol);
}
void
ProtocolErrorBreakpoint(const char* aMsg)
{
// Bugs that generate these error messages can be tough to
// reproduce. Log always in the hope that someone finds the error
// message.
printf_stderr("IPDL protocol error: %s\n", aMsg);
}
void
FatalError(const char* aProtocolName, const char* aMsg,
ProcessHandle aHandle, bool aIsParent)
{
ProtocolErrorBreakpoint(aMsg);
nsAutoCString formattedMessage("IPDL error [");
formattedMessage.AppendASCII(aProtocolName);
formattedMessage.AppendLiteral("]: \"");
formattedMessage.AppendASCII(aMsg);
if (aIsParent) {
formattedMessage.AppendLiteral("\". Killing child side as a result.");
NS_ERROR(formattedMessage.get());
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if (aHandle != kInvalidProcessHandle &&
!base::KillProcess(aHandle, base::PROCESS_END_KILLED_BY_USER, false)) {
NS_ERROR("May have failed to kill child!");
}
} else {
formattedMessage.AppendLiteral("\". abort()ing as a result.");
NS_RUNTIMEABORT(formattedMessage.get());
}
}
} // namespace ipc
} // namespace mozilla