/* -*- 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 "TCPSocketParent.h"
#include "jsapi.h"
#include "jsfriendapi.h"
#include "nsJSUtils.h"
#include "mozilla/Unused.h"
#include "mozilla/net/NeckoCommon.h"
#include "mozilla/net/PNeckoParent.h"
#include "mozilla/dom/ContentParent.h"
#include "mozilla/dom/ScriptSettings.h"
#include "mozilla/dom/TabParent.h"
#include "mozilla/HoldDropJSObjects.h"
#include "nsISocketTransportService.h"
#include "nsISocketTransport.h"
#include "nsIScriptSecurityManager.h"
#include "nsNetUtil.h"

namespace IPC {

// Defined in TCPSocketChild.cpp
extern bool DeserializeArrayBuffer(JSContext* aCx,
                                   const InfallibleTArray<uint8_t>& aBuffer,
                                   JS::MutableHandle<JS::Value> aVal);

}  // namespace IPC

namespace mozilla {

namespace net {
//
// set MOZ_LOG=TCPSocket:5
//
extern LazyLogModule gTCPSocketLog;
#define TCPSOCKET_LOG(args) MOZ_LOG(gTCPSocketLog, LogLevel::Debug, args)
#define TCPSOCKET_LOG_ENABLED() MOZ_LOG_TEST(gTCPSocketLog, LogLevel::Debug)
}  // namespace net

namespace dom {

static void FireInteralError(mozilla::net::PTCPSocketParent* aActor,
                             uint32_t aLineNo) {
  mozilla::Unused << aActor->SendCallback(
      NS_LITERAL_STRING("onerror"),
      TCPError(NS_LITERAL_STRING("InvalidStateError"),
               NS_LITERAL_STRING("Internal error")),
      static_cast<uint32_t>(TCPReadyState::Connecting));
}

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(TCPSocketParentBase)
  NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END

NS_IMPL_CYCLE_COLLECTION(TCPSocketParentBase, mSocket)
NS_IMPL_CYCLE_COLLECTING_ADDREF(TCPSocketParentBase)
NS_IMPL_CYCLE_COLLECTING_RELEASE(TCPSocketParentBase)

TCPSocketParentBase::TCPSocketParentBase() : mIPCOpen(false) {}

TCPSocketParentBase::~TCPSocketParentBase() {}

void TCPSocketParentBase::ReleaseIPDLReference() {
  MOZ_ASSERT(mIPCOpen);
  mIPCOpen = false;
  this->Release();
}

void TCPSocketParentBase::AddIPDLReference() {
  MOZ_ASSERT(!mIPCOpen);
  mIPCOpen = true;
  this->AddRef();
}

NS_IMETHODIMP_(MozExternalRefCountType) TCPSocketParent::Release(void) {
  nsrefcnt refcnt = TCPSocketParentBase::Release();
  if (refcnt == 1 && mIPCOpen) {
    mozilla::Unused << PTCPSocketParent::SendRequestDelete();
    return 1;
  }
  return refcnt;
}

mozilla::ipc::IPCResult TCPSocketParent::RecvOpen(
    const nsString& aHost, const uint16_t& aPort, const bool& aUseSSL,
    const bool& aUseArrayBuffers) {
  mSocket = new TCPSocket(nullptr, aHost, aPort, aUseSSL, aUseArrayBuffers);
  mSocket->SetSocketBridgeParent(this);
  NS_ENSURE_SUCCESS(mSocket->Init(), IPC_OK());
  return IPC_OK();
}

mozilla::ipc::IPCResult TCPSocketParent::RecvOpenBind(
    const nsCString& aRemoteHost, const uint16_t& aRemotePort,
    const nsCString& aLocalAddr, const uint16_t& aLocalPort,
    const bool& aUseSSL, const bool& aReuseAddrPort,
    const bool& aUseArrayBuffers, const nsCString& aFilter) {
  nsresult rv;
  nsCOMPtr<nsISocketTransportService> sts =
      do_GetService("@mozilla.org/network/socket-transport-service;1", &rv);
  if (NS_FAILED(rv)) {
    FireInteralError(this, __LINE__);
    return IPC_OK();
  }

  nsCOMPtr<nsISocketTransport> socketTransport;
  if (aUseSSL) {
    const char* socketTypes[1];
    socketTypes[0] = "ssl";
    rv = sts->CreateTransport(socketTypes, 1, aRemoteHost, aRemotePort, nullptr,
                              getter_AddRefs(socketTransport));
  } else {
    rv = sts->CreateTransport(nullptr, 0, aRemoteHost, aRemotePort, nullptr,
                              getter_AddRefs(socketTransport));
  }

  if (NS_FAILED(rv)) {
    FireInteralError(this, __LINE__);
    return IPC_OK();
  }

  // in most cases aReuseAddrPort is false, but ICE TCP needs
  // sockets options set that allow addr/port reuse
  socketTransport->SetReuseAddrPort(aReuseAddrPort);

  PRNetAddr prAddr;
  if (PR_SUCCESS != PR_InitializeNetAddr(PR_IpAddrAny, aLocalPort, &prAddr)) {
    FireInteralError(this, __LINE__);
    return IPC_OK();
  }
  if (PR_SUCCESS != PR_StringToNetAddr(aLocalAddr.BeginReading(), &prAddr)) {
    FireInteralError(this, __LINE__);
    return IPC_OK();
  }

  mozilla::net::NetAddr addr;
  PRNetAddrToNetAddr(&prAddr, &addr);
  rv = socketTransport->Bind(&addr);
  if (NS_FAILED(rv)) {
    FireInteralError(this, __LINE__);
    return IPC_OK();
  }

  if (!aFilter.IsEmpty()) {
    nsAutoCString contractId(NS_NETWORK_TCP_SOCKET_FILTER_HANDLER_PREFIX);
    contractId.Append(aFilter);
    nsCOMPtr<nsISocketFilterHandler> filterHandler =
        do_GetService(contractId.get());
    if (!filterHandler) {
      NS_ERROR("Content doesn't have a valid filter");
      FireInteralError(this, __LINE__);
      return IPC_OK();
    }
    rv = filterHandler->NewFilter(getter_AddRefs(mFilter));
    if (NS_FAILED(rv)) {
      NS_ERROR("Cannot create filter that content specified");
      FireInteralError(this, __LINE__);
      return IPC_OK();
    }
  }

  mSocket = new TCPSocket(nullptr, NS_ConvertUTF8toUTF16(aRemoteHost),
                          aRemotePort, aUseSSL, aUseArrayBuffers);
  mSocket->SetSocketBridgeParent(this);
  rv = mSocket->InitWithUnconnectedTransport(socketTransport);
  NS_ENSURE_SUCCESS(rv, IPC_OK());
  return IPC_OK();
}

mozilla::ipc::IPCResult TCPSocketParent::RecvStartTLS() {
  NS_ENSURE_TRUE(mSocket, IPC_OK());
  ErrorResult rv;
  mSocket->UpgradeToSecure(rv);
  if (NS_WARN_IF(rv.Failed())) {
    rv.SuppressException();
  }

  return IPC_OK();
}

mozilla::ipc::IPCResult TCPSocketParent::RecvSuspend() {
  NS_ENSURE_TRUE(mSocket, IPC_OK());
  mSocket->Suspend();
  return IPC_OK();
}

mozilla::ipc::IPCResult TCPSocketParent::RecvResume() {
  NS_ENSURE_TRUE(mSocket, IPC_OK());
  ErrorResult rv;
  mSocket->Resume(rv);
  if (NS_WARN_IF(rv.Failed())) {
    rv.SuppressException();
  }

  return IPC_OK();
}

mozilla::ipc::IPCResult TCPSocketParent::RecvData(
    const SendableData& aData, const uint32_t& aTrackingNumber) {
  ErrorResult rv;

  if (mFilter) {
    mozilla::net::NetAddr addr;  // dummy value
    bool allowed;
    MOZ_ASSERT(aData.type() == SendableData::TArrayOfuint8_t,
               "Unsupported data type for filtering");
    const InfallibleTArray<uint8_t>& data(aData.get_ArrayOfuint8_t());
    nsresult nsrv =
        mFilter->FilterPacket(&addr, data.Elements(), data.Length(),
                              nsISocketFilter::SF_OUTGOING, &allowed);

    // Reject sending of unallowed data
    if (NS_WARN_IF(NS_FAILED(nsrv)) || !allowed) {
      TCPSOCKET_LOG(("%s: Dropping outgoing TCP packet", __FUNCTION__));
      return IPC_FAIL_NO_REASON(this);
    }
  }

  switch (aData.type()) {
    case SendableData::TArrayOfuint8_t: {
      AutoSafeJSContext autoCx;
      JS::Rooted<JS::Value> val(autoCx);
      const nsTArray<uint8_t>& buffer = aData.get_ArrayOfuint8_t();
      bool ok = IPC::DeserializeArrayBuffer(autoCx, buffer, &val);
      NS_ENSURE_TRUE(ok, IPC_OK());
      RootedSpiderMonkeyInterface<ArrayBuffer> data(autoCx);
      data.Init(&val.toObject());
      Optional<uint32_t> byteLength(buffer.Length());
      mSocket->SendWithTrackingNumber(autoCx, data, 0, byteLength,
                                      aTrackingNumber, rv);
      break;
    }

    case SendableData::TnsCString: {
      const nsCString& strData = aData.get_nsCString();
      mSocket->SendWithTrackingNumber(strData, aTrackingNumber, rv);
      break;
    }

    default:
      MOZ_CRASH("unexpected SendableData type");
  }
  NS_ENSURE_SUCCESS(rv.StealNSResult(), IPC_OK());
  return IPC_OK();
}

mozilla::ipc::IPCResult TCPSocketParent::RecvClose() {
  NS_ENSURE_TRUE(mSocket, IPC_OK());
  mSocket->Close();
  return IPC_OK();
}

void TCPSocketParent::FireErrorEvent(const nsAString& aName,
                                     const nsAString& aType,
                                     TCPReadyState aReadyState) {
  SendEvent(NS_LITERAL_STRING("error"),
            TCPError(nsString(aName), nsString(aType)), aReadyState);
}

void TCPSocketParent::FireEvent(const nsAString& aType,
                                TCPReadyState aReadyState) {
  return SendEvent(aType, mozilla::void_t(), aReadyState);
}

void TCPSocketParent::FireArrayBufferDataEvent(nsTArray<uint8_t>& aBuffer,
                                               TCPReadyState aReadyState) {
  InfallibleTArray<uint8_t> arr;
  arr.SwapElements(aBuffer);

  if (mFilter) {
    bool allowed;
    mozilla::net::NetAddr addr;
    nsresult nsrv =
        mFilter->FilterPacket(&addr, arr.Elements(), arr.Length(),
                              nsISocketFilter::SF_INCOMING, &allowed);
    // receiving unallowed data, drop it.
    if (NS_WARN_IF(NS_FAILED(nsrv)) || !allowed) {
      TCPSOCKET_LOG(("%s: Dropping incoming TCP packet", __FUNCTION__));
      return;
    }
  }

  SendableData data(arr);
  SendEvent(NS_LITERAL_STRING("data"), data, aReadyState);
}

void TCPSocketParent::FireStringDataEvent(const nsACString& aData,
                                          TCPReadyState aReadyState) {
  SendableData data((nsCString(aData)));

  MOZ_ASSERT(!mFilter, "Socket filtering doesn't support nsCString");

  SendEvent(NS_LITERAL_STRING("data"), data, aReadyState);
}

void TCPSocketParent::SendEvent(const nsAString& aType, CallbackData aData,
                                TCPReadyState aReadyState) {
  if (mIPCOpen) {
    mozilla::Unused << PTCPSocketParent::SendCallback(
        nsString(aType), aData, static_cast<uint32_t>(aReadyState));
  }
}

void TCPSocketParent::SetSocket(TCPSocket* socket) { mSocket = socket; }

nsresult TCPSocketParent::GetHost(nsAString& aHost) {
  if (!mSocket) {
    NS_ERROR("No internal socket instance mSocket!");
    return NS_ERROR_FAILURE;
  }
  mSocket->GetHost(aHost);
  return NS_OK;
}

nsresult TCPSocketParent::GetPort(uint16_t* aPort) {
  if (!mSocket) {
    NS_ERROR("No internal socket instance mSocket!");
    return NS_ERROR_FAILURE;
  }
  *aPort = mSocket->Port();
  return NS_OK;
}

void TCPSocketParent::ActorDestroy(ActorDestroyReason why) {
  if (mSocket) {
    mSocket->Close();
  }
  mSocket = nullptr;
}

mozilla::ipc::IPCResult TCPSocketParent::RecvRequestDelete() {
  mozilla::Unused << Send__delete__(this);
  return IPC_OK();
}

}  // namespace dom
}  // namespace mozilla