### Building local proxy in Windows
* Install visual studio 2017 ( Select Desktop development with c++ while installing ).
* Install Cmake 3.16+ from https://www.cmake.org/download.
* Install Strawberry Perl 5.30+ using link https://www.perl.org/get.html.
* Install git using link https://git-scm.com/download/win
* Install NASM using link https://www.nasm.us/
* Install the following dependencies (Choose visual studio command prompt based on architecture):
    * Download and install zlib:
        * Use Visual Studio native tool command prompt in admin mode.
        * `git clone -b v1.2.13 https://github.com/madler/zlib.git`
        * `cd zlib`
        * `mkdir build`
        * `cd build`
        * `cmake -G "NMake Makefiles" -DCMAKE_BUILD_TYPE=Release ../`
        * `nmake`
        * `nmake install` (installs zlib inside C:\Program Files (x86)\ )
        * Update PATH environment variable to add the dll for zlib which is inside C:\Program Files (x86)\zlib\bin
    * Download and install openssl
        * Use Visual Studio native tool command prompt in admin mode.
        * `git clone https://github.com/openssl/openssl.git`
        * `cd openssl`
        * `git checkout OpenSSL_1_1_1-stable`
        * `perl Configure { VC-WIN32 | VC-WIN64A | VC-WIN64I | VC-CE }` (Choose one of the options based on your architecture, usually WIN64A if you are on the x86_64 platform).
        * `nmake`
        * `nmake install` (installs OpenSSL inside C:\Program Files\)
        * Update PATH environment variable to add the dll for openssl which is inside C:\Program Files\OpenSSL\bin
        * Note: In some x86_64 windows configurations, compiling for a 64 bit target may fail. You may instead install openssl through Chocolatey.
          * https://community.chocolatey.org/packages/openssl
    * Download and install catch2
      * Use Visual Studio native tool command prompt in admin mode.
      * `git clone --branch v2.13.6 https://github.com/catchorg/Catch2.git`
      * `cd Catch2`
      * `mkdir build`
      * `cd build`
      * `cmake -DBUILD_TESTING=OFF -G "NMake Makefiles" -DCMAKE_BUILD_TYPE=Release ../` ( Install python if you want to execute test )
      * `nmake`
      * `nmake install` ( install catch2 inside C:\Program Files (x86)\ )
    * Download and install protobuf
        * Download from https://github.com/protocolbuffers/protobuf/releases/download/v3.17.3/protobuf-all-3.17.3.tar.gz
        * Extract protobuf-all-3.17.3.tar.gz
        * Use Visual Studio native tool command prompt
        * `cd path/to/protobuf-3.17.3`
        * `cd cmake`
        * `mkdir build`
        * `cd build`
        * `cmake -G "NMake Makefiles" -DCMAKE_BUILD_TYPE=Release -Dprotobuf_MSVC_STATIC_RUNTIME=OFF ../`
        * `nmake`
        * `nmake install` ( install protobuf inside C:\Program Files (x86)\ )
    * Download and install boost
        * Download from https://boostorg.jfrog.io/artifactory/main/release/1.76.0/source/boost_1_76_0.tar.gz
        * Extract boost_1_76_0.tar.gz
        * Use Visual Studio native tool command prompt
        * `cd path/to/boost_1_76_0`
        * `bootstrap.bat`
        * `.\b2 toolset=msvc address-model={32 | 64} install define=BOOST_WINAPI_VERSION_WIN10` ( installs boost inside C:\)
            * Replace `BOOST_WINAPI_VERSION_WIN10` with the appropriate macro from [here](https://www.boost.org/doc/libs/develop/libs/winapi/doc/html/winapi/config.html)
    * Download and build aws-iot-securetunneling-localproxy
        * Use Visual Studio native tool command prompt in admin mode
        * `git clone https://github.com/aws-samples/aws-iot-securetunneling-localproxy.git`
        * `cd aws-iot-securetunneling-localproxy`
        * `mkdir build`
        * `cd build`
        * Build the cmake project. Replace <_WIN32_WINNT> with the appropriate value based on [your OS from here](https://docs.microsoft.com/en-us/cpp/porting/modifying-winver-and-win32-winnt?view=vs-2019)
            * For visual studio 2019
            ```
            cmake -DWIN32_WINNT=<_WIN32_WINNT> -DBoost_USE_STATIC_LIBS=ON -DCMAKE_PREFIX_PATH="C:\Boost;C:\Program Files (x86)\Catch2;C:\Program Files (x86)\protobuf;C:\Program Files\OpenSSL" -G "Visual Studio 16 2019" -A x64 ..\
            ```
            * for visual studio 2017
            ```
            cmake -DWIN32_WINNT=<_WIN32_WINNT> -DBoost_USE_STATIC_LIBS=ON -DCMAKE_PREFIX_PATH="C:\Boost;C:\Program Files (x86)\Catch2;C:\Program Files (x86)\protobuf;C:\Program Files\OpenSSL" -G "Visual Studio 15 2017 <Win64/Win32>" ..\
            ```
        * `msbuild localproxy.vcxproj -p:Configuration=Release` ( builds localproxy.exe inside bin\Release folder )
    * Follow [instructions](https://github.com/aws-samples/aws-iot-securetunneling-localproxy) under heading `Security Considerations` to run local proxy on a window OS.