teleport attempts to use jsonrpc 2.0 despite it not being supported by Core

[Kixunil]

After unsuccessful attempt to try this out I recorded the communication and it looks like jsonrpc 2.0 is the problem:

Recorded request from teleport:

POST /wallet/teleport HTTP/1.1
Host: localhost:18441
Content-Type: application/json
Authorization: Basic X19jb29raWVfXzowMzM4Nzc1MTMyOGVmOTJiNGEzOGIxNDg2MDY5NmNkNzg3YWQ2ZWNkNWNiYmE1NGFjOTI2YzM2YmQwMjYwNThm
Content-Length: 65

{"method":"getblockchaininfo","params":[],"id":1,"jsonrpc":"2.0"}

Request from bitcoin-cli:

POST / HTTP/1.1
Host: 127.0.0.1
Connection: close
Content-Type: application/json
Authorization: Basic X19jb29raWVfXzowMzM4Nzc1MTMyOGVmOTJiNGEzOGIxNDg2MDY5NmNkNzg3YWQ2ZWNkNWNiYmE1NGFjOTI2YzM2YmQwMjYwNThm
Content-Length: 50

{"method":"getblockchaininfo","params":[],"id":1}

(don't worry about the "leak", it's a disposable VM :))

• Commit: edbc4b7ae419cf463aebef57aaf956c67dc66b7f
• Using cookie authentication (with patched path)
• Command used to record the request: socat TCP-LISTEN:18441,fork,reuseaddr SYSTEM:'tee /proc/self/fd/2 | nc 127.0.0.1 18444 | tee /proc/self/fd/2' (yes, my ports are correct)
• Attempted teleport command: sudo -u bitcoin-regtest ./target/debug/teleport --wallet-file-name=maker1.teleport generate-wallet
• Bitcoin Core version: 0.21.1
• No relevant logs in bitcoind debug.log
• Yes, the network was initialized by mining a bunch of blocks (101)

I'm still confused how come this wasn't discovered already...

P.S.: thanks a lot for working on this project!!!

[chris-belcher]

Thanks for the issue.

At first glance it's pretty strange to me. I've been successfully using the project for ages, and I've used Bitcoin Core 0.21 and 22.0. Before release I did cargo clean and rebuilt the project from scratch, and made some coinswaps on regtest and signet, so I'm also confused how something like this could've been missed. There must be some small detail...

I'll think a little some more.

edit: fwiw teleport doesn't implement its own json-rpc, it uses https://github.com/rust-bitcoin/rust-bitcoincore-rpc

[Kixunil]

Do we have same dependencies? Cargo.lock is not committed (it should be for binaries), so maybe I have something different. Possibly relevant:

name = "jsonrpc"
version = "0.11.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "436f3455a8a4e9c7b14de9f1206198ee5d0bdc2db1b560339d2141093d7dd389"

[chris-belcher]

Looks like I have the same.

[[package]]
name = "jsonrpc"
version = "0.11.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "436f3455a8a4e9c7b14de9f1206198ee5d0bdc2db1b560339d2141093d7dd389"
dependencies = [
 "hyper 0.10.16",
 "serde",
 "serde_derive",
 "serde_json",
]

But good thinking, I'm pretty sure I have kept the same Cargo.lock this whole time, I've renamed it and am now building from scratch to see if I reproduce the error.

edit: attached is my whole file Cargo.lock.txt

[chris-belcher]

I just tried running teleport after cargo clean and deleting the Cargo.lock file. And it worked fine.

In case its helpful heres the new Cargo.lock file Cargo-new.lock.txt

I'm sure you've already checked this, but do you have a wallet called teleport loaded in Bitcoin Core? It has to be an old-style wallet not a descriptor wallet. Bitcoin Core 22.0 creates descriptor wallets by default now so watch out (Indeed one of the TODOs is to move teleport to using descriptor wallets, since they are the future clearly)

[Kixunil]

Interesting, will investigate. I think wallets shouldn't affect getblockchaininfo RPC, right?

[chris-belcher]

You're right they shouldnt.

run-watchtower is a subroutine which does not use wallets at all, so that could be a useful test maybe.

[Kixunil]

$ diff Cargo.lock Cargo-new.lock.txt 
2a3,4
> version = 3
> 

Weird. Maybe Rust version is relevant? I have 1.59. Also, I used debug mode.

[Kixunil]

I tried to bump dependencies: bitcoin to 0.27.1 and bitcoincore-rpc to 0.14 and it seem to have helped. I can send a PR during the day (UTC+1) if you want. It's trivial anyway.

[chris-belcher]

I intentionally downgraded because of this issue: https://github.com/rust-bitcoin/rust-bitcoincore-rpc/issues/211

Are you able to reproduce that issue on your end? Try creating a new wallet, it should run importmulti

[Kixunil]

I tried the code at the issue you posted as well as running generate-wallet of teleport-transactions (with a new, empty wallet) and both succeeded.

[chris-belcher]

Oh weird.

I guess then update it on your end and we'll leave the current versions on the repos, when more people try out the software we can see how best to solve it then.

[Kixunil]

TBH, I'm starting to be afraid of UB since the behavior is so non-deterministic. Hopefully I can run it through asan/ubsan when I get a bit of time.

[chris-belcher]

What is UB?

[Kixunil]

Undefined behavior. Of course it'd mean a problem in some unsafe block in one of the dependencies.