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/*++
Copyright (c) Microsoft Corporation. All rights reserved.
--*/
#include "Internal.h"
#include "Connection.tmh"
/* 9C7D2C68-5AD8-4A14-BE20-F8741D60D100 */
const GUID MAGIC_PACKET_P2P =
{0x9C7D2C68, 0x5AD8, 0x4A14, {0xBE, 0x20, 0xF8, 0x74, 0x1D, 0x60, 0xD1, 0x00}};
/* 9C7D2C68-5AD8-4A14-BE20-F8741D60D101 */
const GUID MAGIC_PACKET_TAG =
{0x9C7D2C68, 0x5AD8, 0x4A14, {0xBE, 0x20, 0xF8, 0x74, 0x1D, 0x60, 0xD1, 0x01}};
/* 9C7D2C68-5AD8-4A14-BE20-F8741D60D102 */
const GUID MAGIC_PACKET_HCE =
{0x9C7D2C68, 0x5AD8, 0x4A14, {0xBE, 0x20, 0xF8, 0x74, 0x1D, 0x60, 0xD1, 0x02}};
HRESULT SetSocketIpv6Only(_In_ SOCKET socket, _In_ BOOL Ipv6Only);
HRESULT SynchronousReadSocket(_In_ SOCKET Socket, _In_reads_bytes_(cbBuffer) PVOID pBuffer, _In_ DWORD cbBuffer)
{
HRESULT hr = S_OK;
DWORD cbBytesRead = 0;
OVERLAPPED Overlapped = {};
if (!ReadFile((HANDLE)Socket, pBuffer, cbBuffer, &cbBytesRead, &Overlapped)) {
if (GetLastError() == ERROR_IO_PENDING) {
if (!GetOverlappedResult((HANDLE)Socket, &Overlapped, &cbBytesRead, TRUE)) {
hr = HRESULT_FROM_WIN32(GetLastError());
}
}
else {
hr = HRESULT_FROM_WIN32(GetLastError());
}
}
return hr;
}
BOOL CConnection::Create(_In_ IConnectionCallback* pCallback, _Outptr_result_maybenull_ CConnection** ppConnection)
{
NT_ASSERT(ppConnection != nullptr);
*ppConnection = new CConnection(pCallback);
if (*ppConnection != nullptr) {
return TRUE;
}
return FALSE;
}
void CConnection::Terminate()
{
MethodEntry("void");
STATE PriorState = (STATE)(InterlockedExchange((long*)&_State, (long)TERMINATED));
if (PriorState != TERMINATED) {
shutdown(_Socket, SD_SEND);
if (_ThreadpoolThreadId != GetCurrentThreadId()) {
WaitForThreadpoolWorkCallbacks(_ThreadpoolWork, false);
}
SOCKET Socket = (SOCKET)InterlockedExchangePointer((PVOID*)&_Socket, (PVOID)INVALID_SOCKET);
if (Socket != INVALID_SOCKET) {
closesocket(Socket);
}
}
MethodReturnVoid();
}
HRESULT CConnection::InitializeAsClient(_In_ BEGIN_PROXIMITY_ARGS* pArgs)
{
MethodEntry("pArgs->szName = '%S'", pArgs->szName);
HRESULT hr = S_OK;
pArgs->szName[MAX_PATH-1] = L'\0';
_Socket = socket(AF_INET6, SOCK_STREAM, 0);
if (_Socket == INVALID_SOCKET) {
hr = HRESULT_FROM_WIN32(WSAGetLastError());
}
if (SUCCEEDED(hr)) {
hr = SetSocketIpv6Only(_Socket, FALSE);
}
if (SUCCEEDED(hr)) {
SOCKADDR_STORAGE LocalAddress = {};
SOCKADDR_STORAGE RemoteAddress = {};
DWORD cbLocalAddress = sizeof(LocalAddress);
DWORD cbRemoteAddress = sizeof(RemoteAddress);
timeval Timeout = {8, 0};
if (!WSAConnectByName(
_Socket,
pArgs->szName,
L"9299",
&cbLocalAddress,
(SOCKADDR*)&LocalAddress,
&cbRemoteAddress,
(SOCKADDR*)&RemoteAddress,
&Timeout,
nullptr)) {
hr = HRESULT_FROM_WIN32(WSAGetLastError());
TraceErrorHR(hr, L"WSAConnectByName returned failure");
}
}
if (SUCCEEDED(hr)) {
if (setsockopt(_Socket, SOL_SOCKET, SO_UPDATE_CONNECT_CONTEXT, nullptr, 0) == SOCKET_ERROR) {
hr = HRESULT_FROM_WIN32(WSAGetLastError());
}
}
if (SUCCEEDED(hr)) {
if (send(_Socket, (char*)&MAGIC_PACKET_P2P, sizeof(MAGIC_PACKET_P2P), 0) == SOCKET_ERROR) {
hr = HRESULT_FROM_WIN32(WSAGetLastError());
}
if (SUCCEEDED(hr)) {
GUID MagicPacket = {};
hr = SynchronousReadSocket(_Socket, &MagicPacket, sizeof(MagicPacket));
if (SUCCEEDED(hr)) {
if (memcmp(&MagicPacket, &MAGIC_PACKET_P2P, sizeof(MAGIC_PACKET_P2P)) != 0) {
hr = E_FAIL;
}
}
}
if (SUCCEEDED(hr)) {
hr = FinalizeEstablish(INVALID_SOCKET);
}
}
if (FAILED(hr)) {
if (_Socket != INVALID_SOCKET) {
closesocket(_Socket);
_Socket = INVALID_SOCKET;
}
}
MethodReturnHR(hr);
}
void CConnection::ValidateAccept(_In_ SOCKET Socket, _In_ GUID* pMagicPacket)
{
MethodEntry("...");
TraceASSERT(Socket != INVALID_SOCKET);
HRESULT hr = S_OK;
if (memcmp(pMagicPacket, &MAGIC_PACKET_P2P, sizeof(MAGIC_PACKET_P2P)) == 0) {
_ConnectionType = CONNECTION_TYPE_P2P;
}
else if (memcmp(pMagicPacket, &MAGIC_PACKET_TAG, sizeof(MAGIC_PACKET_TAG)) == 0) {
_ConnectionType = CONNECTION_TYPE_TAG;
}
else if (memcmp(pMagicPacket, &MAGIC_PACKET_HCE, sizeof(MAGIC_PACKET_HCE)) == 0) {
_ConnectionType = CONNECTION_TYPE_HCE;
}
else {
hr = E_FAIL;
}
if (SUCCEEDED(hr)) {
if (send(Socket, (char*)pMagicPacket, sizeof(GUID), 0) == SOCKET_ERROR) {
hr = HRESULT_FROM_WIN32(WSAGetLastError());
}
}
if (SUCCEEDED(hr)) {
hr = FinalizeEstablish(Socket);
}
if (FAILED(hr)) {
closesocket(Socket);
}
MethodReturnVoid();
}
HRESULT CConnection::FinalizeEstablish(_In_ SOCKET Socket)
{
MethodEntry("...");
HRESULT hr = S_OK;
STATE PriorState = (STATE)(InterlockedCompareExchange((long*)&_State, (long)ESTABLISHED, (long)INITIAL));
if (PriorState != INITIAL) {
hr = HRESULT_FROM_WIN32(ERROR_ALREADY_INITIALIZED);
}
if (SUCCEEDED(hr)) {
_ThreadpoolWork = CreateThreadpoolWork(s_ReceiveThreadProc, this, nullptr);
if (_ThreadpoolWork == nullptr) {
hr = HRESULT_FROM_WIN32(GetLastError());
}
else {
if (Socket != INVALID_SOCKET) {
_Socket = Socket;
}
SubmitThreadpoolWork(_ThreadpoolWork);
_pCallback->ConnectionEstablished(this);
}
}
MethodReturnHR(hr);
}
BOOL CConnection::ReceiveThreadProc()
{
MethodEntry("void");
MESSAGE* pMessage = new MESSAGE();
if (pMessage == nullptr) {
Terminate();
}
else
{
while (_Socket != INVALID_SOCKET) {
if (recv(_Socket, (char*)pMessage, sizeof(*pMessage), MSG_WAITALL) == sizeof(*pMessage)) {
_pCallback->HandleReceivedMessage(_ConnectionType, pMessage);
}
else {
Terminate();
break;
}
}
delete pMessage;
}
BOOL fConnectionDeleted = _pCallback->ConnectionTerminated(this);
MethodReturnBool(fConnectionDeleted);
}
HRESULT CConnection::TransmitMessage(_In_ MESSAGE* pMessage)
{
MethodEntry("...");
HRESULT hr = S_OK;
if (_Socket == INVALID_SOCKET) {
hr = HRESULT_FROM_WIN32(WSAENOTSOCK);
}
else {
if (send(_Socket, (char*)pMessage, sizeof(*pMessage), 0) == SOCKET_ERROR) {
hr = HRESULT_FROM_WIN32(WSAGetLastError());
Terminate();
}
}
MethodReturnHR(hr);
}
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