Init FDBus docs

README.rst

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+Introduction
+============
+
+`FDBus Documentation <https://fdbus.readthedocs.io/en/latest/?badge=latest>`_
+
+.. image:: https://readthedocs.org/projects/fdbus/badge/?version=latest
+
+``FDBus`` is a middleware development framework targeting the following objectives:
+
+- Inter-Process Communication (``IPC``) within single host and cross the network
+- System abstraction (``Windows``, ``Linux``, ``QNX``)
+- Components based on which middleware is built (job, worker, timer, watch...)
+
+It is something like ``DBus`` or ``SOME/IP``, but with its own characteristic:
+
+- **Distributed** : unlike ``DBus``, it has no central hub
+- **High performance** : endpoints talk to each other directly
+- **Addressing by name** : service is addressable through logic name
+- **Address allocation** : service address is allocated dynamically
+- **Networking** : communication inside host and cross hosts
+- **IDL and code generation** : using protocol buffer
+- **Total slution** : it is more than an ``IPC`` machanism. it is a middleware development framework
+
+Its usage can be found in the following fields:
+
+- Infotainment; instrument cluster, TBox and other ECU with posix-compatible OS running
+- Inter VM communication between guest OSes in hypervisor
+- SOHO Gateway
+- Instrument for distributed industry control
+
+Supported system
+----------------
+
+- ``Linux``
+- ``Windows``
+- ``QNX``
+
+Dependence
+----------
+- cmake - 3.1.3 or above
+- protocol buffer
+- compiler supporting C++11
+
+Download
+--------
+https://github.com/jeremyczhen/fdbus.git
+
+Documentation & Blog
+--------------------
+https://blog.csdn.net/jeremy_cz/article/details/89060291
+
+How to build
+------------
+For Ubuntu host version (running at host machine)
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Dependence:
+
+- cmake, gcc are installed
+
+1. build protocol buffer
+
+.. code-block:: bash
+
+   1.1 cd ~/workspace
+   1.2 git clone https://github.com/protocolbuffers/protobuf.git #get protobuf source code
+   1.3 cd protobuf;git submodule update --init --recursive
+   1.4 mkdir -p build/install;cd build #create directory for out-of-source build
+   1.5 cmake -DCMAKE_INSTALL_PREFIX=install -DBUILD_SHARED_LIBS=1 ../cmake
+   1.6 make -j4 install #build and install to build/install directory
+
+2. build fdbus
+
+.. code-block:: bash
+
+   2.1 cd ~/workspace
+   2.2 git clone https://github.com/jeremyczhen/fdbus.git #get fdbus source code
+   2.3 cd fdbus;mkdir -p build/install;cd build #create directory for out-of-source build
+   2.4 cmake -DSYSTEM_ROOT=~/workspace/protobuf/build/install -DCMAKE_INSTALL_PREFIX=install ../cmake
+   2.5 PATH=~/workspace/protobuf/build/install/bin:$PATH make #set PATH to the directory where protoc can be found
+
+For cross compiling on Ubuntu (target version)
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Dependence:
+
+- cmake, gcc and toolchain are installed
+
+1 build protocol buffer
+
+.. code-block:: bash
+
+   1.1 cd ~/workspace
+   1.2 create toolchain.cmake #create toolchain.cmake and set g++ and gcc for target build in cmake/toolchain.cmake (see below)
+   1.3 git clone https://github.com/protocolbuffers/protobuf.git protobuf-host #get protobuf source code for host build
+   1.4 cd protobuf-host && git submodule update --init --recursive && cd ..
+   1.5 cp protobuf-host protobuf-target -r #create a copy for cross compiling
+   1.6 cd protobuf-host;mkdir -p build/install;cd build #create directory for out-of-source build
+   1.7 cmake -DCMAKE_INSTALL_PREFIX=install -DBUILD_SHARED_LIBS=1 ../cmake
+   1.8 make -j4 install #build and install to build/install directory; now we have protoc running at host
+   1.9 cd ../../protobuf-target;mkdir -p build/install;cd build #create directory for out-of-source build
+   1.10 cmake -DCMAKE_INSTALL_PREFIX=install -DBUILD_SHARED_LIBS=1 -DCMAKE_TOOLCHAIN_FILE=../../toolchain.cmake ../cmake
+   1.11 PATH=~/workspace/protobuf-host/build/install/bin:$PATH make -j4 install #build and install to build/install directory
+
+2. build fdbus
+
+.. code-block:: bash
+
+   2.1 cd ~/workspace
+   2.2 git clone https://github.com/jeremyczhen/fdbus.git
+   2.3 cd fdbus;mkdir -p build/install;cd build
+   2.4 cmake -DSYSTEM_ROOT=~/workspace/protobuf-target/build/install -DCMAKE_INSTALL_PREFIX=install -DCMAKE_TOOLCHAIN_FILE=../../toolchain.cmake ../cmake
+   2.5 PATH=~/workspace/protobuf-host/build/install/bin:$PATH make #set PATH to the directory where protoc can be found
+
+For QNX
+^^^^^^^
+
+The same as cross compiling, but when building fdbus, should add the following option to cmake since QNX doesn't support peercred:
+
+.. code-block:: bash
+
+   -Dfdbus_SOCKET_ENABLE_PEERCRED=OFF
+
+For Windows version
+^^^^^^^^^^^^^^^^^^^
+
+Dependence:
+
+- cmake, msvc are installed
+
+1 build protocol buffer
+
+.. code-block:: bash
+
+   1.1 cd c:\workspace
+   1.2 #suppose source code of protocol buffer is already downloaded and placed at c:\workspace\protobuf
+   1.3 cd protobuf;mkdir -p cbuild\install;cd cbuild #create directory for out-of-source build
+   1.4 cmake -DCMAKE_INSTALL_PREFIX=install ..\cmake
+   1.5 open protobuf.sln in c:\workspace\protobuf\cbuild and build project INSTALL
+
+2. build fdbus
+
+.. code-block:: bash
+
+   2.1 cd ~/workspace
+   2.2 #suppose source code of fdbus is already downloaded and placed at c:\workspace\fdbus
+   2.3 cd fdbus;mkdir -p build\install;cd build #create directory for out-of-source build
+   2.4 cmake -DSYSTEM_ROOT=c:\workspace\protobuf\build\install -DCMAKE_INSTALL_PREFIX=install ..\cmake
+   2.5 copy c:\workspace\protobuf\cbuild\install\bin\protoc.exe to the directory in PATH environment variable
+   2.6 open fdbus.sln in c:\workspace\fdbus\build and build project INSTALL
+
+How to run
+----------
+For single host
+^^^^^^^^^^^^^^^
+
+.. code-block:: bash
+
+   1. start name server:
+      > name_server
+   2. start clients/servers
+
+For multi-host
+^^^^^^^^^^^^^^
+
+.. code-block:: bash
+
+   1. start name server at host1:
+      host1> name_server
+   2. start host server at host1:
+   3. start name server at host2:
+      host2> name_server -u tcp://ip_of_host1:60000
+   4. start clients/servers at host1 and host2
+
+example of toolchain.cmake for cross-compiling
+----------------------------------------------
+
+.. code-block:: bash
+
+   >>>> cat toolchain.cmake
+   SET(CMAKE_SYSTEM_NAME Linux)
+   SET(CMAKE_CXX_COMPILER ~/project/android/workspace/prebuilts/gcc/linux-x86/aarch64/aarch64-linux-gnu-7.1.1/bin/aarch64-linux-gnu-g++)
+   SET(CMAKE_C_COMPILER ~/project/android/workspace/prebuilts/gcc/linux-x86/aarch64/aarch64-linux-gnu-7.1.1/bin/aarch64-linux-gnu-gcc)
+
+cmake options
+-------------
+
+.. note::
+
+   The following options can be specified with ``-Dfdbus_XXX=ON/OFF`` when running ``cmake``.
+   The status with ``*`` is set as default.
+
+``fdbus_BUILD_TESTS``
+ | *``ON`` : build examples
+ | ``OFF``: don't build examples
+``fdbus_ENABLE_LOG``
+ | *``ON`` : enable log output of fdbus lib
+ | ``OFF``: disable log output of fdbus lib
+``fdbus_LOG_TO_STDOUT``
+ | ``ON`` : send fdbus log to stdout (terminal)
+ | *``OFF``: fdbus log is sent to log server
+``fdbus_ENABLE_MESSAGE_METADATA``
+ | *``ON`` : time stamp is included in fdbus message to track delay of message during request-reply interaction
+ | ``OFF``: time stamp is disabled
+``fdbus_SOCKET_BLOCKING_CONNECT``
+ | ``ON`` : socket method connect() will be blocked forever if server is not ready to accept
+ | *``OFF``: connect() will be blocked with timer to avoid permanent blocking
+``fdbus_SOCKET_ENABLE_PEERCRED``
+ | *``ON`` : peercred of UDS (Unix Domain Socket) is enabled
+ | ``OFF``: peercred of UDS is disabled
+``fdbus_ALLOC_PORT_BY_SYSTEM``
+ | ``ON`` : socket number of servers are allocated by the system
+ | *``OFF``: socket number of servers are allocated by name server
+``fdbus_SECURITY``
+ | ``ON`` : enable security
+ | *``OFF``: disable security
+
+.. note::
+
+   The following options can be specified with 
+   ``-DMACRO_DEF='VARIABLE=value;VARIABLE=value'``
+
+``FDB_CFG_SOCKET_PATH``
+ | specify directory of UDS file
+ | default: /tmp
+
+``CONFIG_SOCKET_CONNECT_TIMEOUT``
+ | specify timeout of connect() when connect to socket server in ms. 
+   "``0``" means block forever.
+ | default: 2000
+
+Security concept
+----------------
+Authentication of client:
+^^^^^^^^^^^^^^^^^^^^^^^^^
+
+ | 1. server registers its name to ``name server``;
+ | 2. ``name server`` reply with URL and token;
+ | 3. server binds to the URL and holds the token;
+ | 4. client requests name resolution from ``name server``;
+ | 5. ``name server`` authenticate client by checking peercred
+   (``SO_PEERCRED`` option of socket), including ``UID``, ``GID`` of the client
+ | 6. if success, ``name server`` gives URL and token of requested server to
+   the client
+ | 7. client connects to the server with URL followed by sending the token 
+   to the server
+ | 8. server verify the token and grant the connection if pass; 
+   for unauthorized client, since it does not have a valid token, server will 
+   drop the connection 
+ | 9. ``name server`` can assign multiple tokens to server but only send one 
+   of them to the client according to security level of the client
+
+Authenication of host
+^^^^^^^^^^^^^^^^^^^^^
+
+TBD
+
+