iodine_rs

Rust implementation of the iodine client, to tunnel IPv4 through DNS.

Prerequisites

• Rust
• C compiler
• cmake

Quickstart

Start the iodine server similar like:

sudo ./bin/iodined -f -c -P secretpassword 192.168.99.1 <DOMAIN>

Start the rust client (root privileges required):

cargo build
sudo target/debug/iodine_rs

Status

DNS Type TXT is currently hard coded. Currently base32 only, could be easily extended.

• Handshake
  • Version handshake
  • Login
  • Setup TUN dev
  • Check edns0 support
  • Set upstream encoding (using default)
  • Set downstream encoding
  • Set fragment size
• Data transfer

Intermediate DNS server

Nearly all DNS server have some kind of mechanism to block spam or dns tunneling. We tested with the following Intermediates:

• google (works best!)
• cloudflare (high latency)
• eduroam (doesn't work)

Further work

• Support more encodings
• Async TUN & DNS (may also send & recv)