CS144实验答案，中国科学技术大学2023春网络系统实验

# 传输层实验 - 应用层向TCP层发送用于网间传输的、用8位字节表示的数据流， - 然后TCP把数据流分区成适当长度的报文段（通常受该计算机连接的网络的数据链路层的最大传输单元（MTU）的限制）。 - 之后TCP把结果包传给IP层，由它来通过网络将包传送给接收端实体的TCP层。 - TCP为了保证不发生丢包，就给每个包一个序号，同时序号也保证了传送到接收端实体的包的按序接收。 - 本实验要求实验者完善TCP接收器，实现按序接收，滑窗控制，按序回应等功能 For build prereqs, see [the CS144 VM setup instructions](https://web.stanford.edu/class/cs144/vm_howto). ## Sponge quickstart To set up your build directory: $ mkdir -p <path/to/sponge>/build $ cd <path/to/sponge>/build $ cmake .. **Note:** all further commands listed below should be run from the `build` dir. To build: $ make You can use the `-j` switch to build in parallel, e.g., $ make -j$(nproc) To test (after building; make sure you've got the [build prereqs](https://web.stanford.edu/class/cs144/vm_howto) installed!) $ make check The first time you run `make check`, it will run `sudo` to configure two [TUN](https://www.kernel.org/doc/Documentation/networking/tuntap.txt) devices for use during testing. ### build options You can specify a different compiler when you run cmake: $ CC=clang CXX=clang++ cmake .. You can also specify `CLANG_TIDY=` or `CLANG_FORMAT=` (see "other useful targets", below). Sponge's build system supports several different build targets. By default, cmake chooses the `Release` target, which enables the usual optimizations. The `Debug` target enables debugging and reduces the level of optimization. To choose the `Debug` target: $ cmake .. -DCMAKE_BUILD_TYPE=Debug The following targets are supported: - `Release` - optimizations - `Debug` - debug symbols and `-Og` - `RelASan` - release build with [ASan](https://en.wikipedia.org/wiki/AddressSanitizer) and [UBSan](https://developers.redhat.com/blog/2014/10/16/gcc-undefined-behavior-sanitizer-ubsan/) - `RelTSan` - release build with [ThreadSan](https://developer.mozilla.org/en-US/docs/Mozilla/Projects/Thread_Sanitizer) - `DebugASan` - debug build with ASan and UBSan - `DebugTSan` - debug build with ThreadSan Of course, you can combine all of the above, e.g., $ CLANG_TIDY=clang-tidy-6.0 CXX=clang++-6.0 .. -DCMAKE_BUILD_TYPE=Debug **Note:** if you want to change `CC`, `CXX`, `CLANG_TIDY`, or `CLANG_FORMAT`, you need to remove `build/CMakeCache.txt` and re-run cmake. (This isn't necessary for `CMAKE_BUILD_TYPE`.) ### other useful targets To generate documentation (you'll need `doxygen`; output will be in `build/doc/`): $ make doc To lint (you'll need `clang-tidy`): $ make -j$(nproc) tidy To run cppcheck (you'll need `cppcheck`): $ make cppcheck To format (you'll need `clang-format`): $ make format To see all available targets, $ make help