No definitions found in ARM64 Flutter library

[nshp]

Found this via lobste.rs today and figured I'd give it a shot with something I was already looking at. In case you're interested in (maybe?) different formats, I have a file here which I'm almost positive has a bunch of protobuf defs built in, but protodump doesn't find any:

$ protodump -file libapp.so -v -output proto
Got error parsing definition: Couldn't unmarshal proto: proto: cannot parse invalid wire-format data
Got error parsing definition: Couldn't create FileDescriptor: proto: file path must be populated
Got error parsing definition: Couldn't unmarshal proto: proto: cannot parse invalid wire-format data
Got error parsing definition: Couldn't create FileDescriptor: proto: file path must be populated
Got error parsing definition: Couldn't create FileDescriptor: proto: file path must be populated
Got error parsing definition: Couldn't unmarshal proto: proto: cannot parse invalid wire-format data
Got error parsing definition: Couldn't create FileDescriptor: proto: file path must be populated
Got error parsing definition: Couldn't create FileDescriptor: proto: file path must be populated

https://segbrk.com/libapp.so.gz

[arkadiyt]

Some discussion here: google/protobuf.dart#490

They mention that the descriptors are contained in a pbjson.dart file, and looking at a sample dart app I see e.g. this: https://github.com/grpc/grpc-dart/blob/master/example/route_guide/lib/src/generated/route_guide.pbjson.dart

where the descriptors are base64 encoded. It should be possible to base64 decode the values, unmarshall them (except I don't think they provide the FileDescriptor? Just the messages/enums/etc?), and print them out the same as the blog post, I'm just not 100% sure what the best way to scan for those base64 sequences would be. I'll think some more on this tonight

[theimpulson]

I tried running the tool on the latest google play services and got the same error.

PS C:\Users\aayus\Downloads> protodump -v --file .\play.apk
Got error parsing definition: Couldn't create FileDescriptor: proto: file path must be populated
Got error parsing definition: Couldn't create FileDescriptor: proto: file path must be populated
Got error parsing definition: Couldn't create FileDescriptor: proto: file path must be populated
Got error parsing definition: Couldn't create FileDescriptor: proto: file path must be populated
Got error parsing definition: Couldn't create FileDescriptor: proto: file path must be populated
Got error parsing definition: Couldn't create FileDescriptor: proto: file path must be populated
Got error parsing definition: Couldn't unmarshal proto: proto: cannot parse invalid wire-format data
Got error parsing definition: Couldn't unmarshal proto: proto: cannot parse invalid wire-format data
Got error parsing definition: Couldn't create FileDescriptor: proto: invalid syntax: "icKeyPinningForLocalTrustAnchors_\x00'byteBuffer must be a direct ByteBuffer.\x00\tbyteValue\x00\x01c\x00\x14calculateSignalLev"
Got error parsing definition: Couldn't create FileDescriptor: proto: invalid or duplicate public import index: 65
Got error parsing definition: Couldn't create FileDescriptor: proto: file path must be populated
Got error parsing definition: Couldn't create FileDescriptor: proto: file path must be populated
Got error parsing definition: Couldn't create FileDescriptor: proto: file path must be populated
Got error parsing definition: Couldn't create FileDescriptor: proto: file path must be populated
Got error parsing definition: Couldn't create FileDescriptor: proto: file path must be populated
Got error parsing definition: Couldn't create FileDescriptor: proto: file path must be populated
Got error parsing definition: Couldn't create FileDescriptor: proto: file path must be populated
Got error parsing definition: Couldn't create FileDescriptor: proto: file path must be populated
Got error parsing definition: Couldn't create FileDescriptor: proto: file path must be populated
Got error parsing definition: Couldn't create FileDescriptor: proto: file path must be populated
Got error parsing definition: Couldn't create FileDescriptor: proto: file path must be populated
Got error parsing definition: Couldn't create FileDescriptor: proto: file path must be populated
Got error parsing definition: Couldn't create FileDescriptor: proto: file path must be populated
Got error parsing definition: Couldn't create FileDescriptor: proto: file path must be populated