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protodec
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protodec/README.md

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protodec

A tool to decompile protobuf classes compiled by protoc, from CIL assemblies back into .proto definitions.

Usage

Usage: [arguments...] [options...] [-h|--help] [--version]

Arguments:
  [0] <string>    Either the path to the target assembly or a directory of assemblies, all of which be parsed.
  [1] <string>    An existing directory to output into individual files, otherwise output to a single file.

Options:
  --skip-enums                                                  Skip parsing enums and replace references to them with int32. (Optional)
  --include-properties-without-non-user-code-attribute          Includes properties that aren't decorated with `DebuggerNonUserCode` when parsing. (Optional)
  --include-service-methods-without-generated-code-attribute    Includes methods that aren't decorated with `GeneratedCode("grpc_csharp_plugin")` when parsing gRPC services. (Optional)
  --parse-service-servers                                       Parses gRPC service definitions from server classes. (Optional)
  --parse-service-clients                                       Parses gRPC service definitions from client classes. (Optional)
  --log-level <LogLevel>                                        Logging severity level. (Default: Information)

Limitations

  • Integers are assumed to be (u)int32/64 as CIL doesn't differentiate between them and sint32/64 and (s)fixed32/64.
  • Package names are not preserved in protobuf compilation so naturally we cannot recover them during decompilation, which may result in naming conflicts.
  • When decompiling from Il2CppDumper DummyDLLs
    • The Name parameter of OriginalNameAttribute is not dumped. In this case, the CIL enum field names are used after conforming them to protobuf conventions

License

This project is subject to the terms of the Mozilla Public License, v. 2.0.