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protodec

A tool to decompile protoc compiled protobuf classes back into .proto definitions.

Usage

Usage: [command] [arguments...] [options...] [-h|--help] [--version]                                                                                                                                                                                                                    
Use reflection backend to load target CIL assembly and its dependants.

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)

Commands:
  il2cpp    Use LibCpp2IL backend to directly load Il2Cpp compiled game assembly. EXPERIMENTAL.

See per-command help message for more info.

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 or from an Il2Cpp assembly older than metadata version 29, due to the development branch of LibCpp2Il not yet recovering method bodies
    • The Name parameter of OriginalNameAttribute is not parsed. In this case, the CIL enum field names are used after conforming them to protobuf conventions.
    • The Tool parameter of GeneratedCodeAttribute is not compared against when parsing gRPC service methods, which may cause false positives in the event that another tool has generated methods in the service class.

License

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