snowflake

Go package hosted at tgragnato/snowflake.

Documentation available at pkg.go.dev.

• golang 1.24+ & bumped dependencies
• custom transport for broker negotiation (TLS 1.3 with selected ciphersuites & groups, MultiPath TCP)
• custom DTLS fingerprint, different from any popular WebRTC implementation
• use the Setting Engine to reduce MulticastDNS noise
• use a context aware io.Reader that closes on errors in copyLoop
• extremely simple token handling
• client padding to evade TLS in DTLS detection
• introduction of a proxy option to force the NAT type as unrestricted
• coder/websocket in place of gorilla/websocket

We have more documentation in the Snowflake wiki and at https://snowflake.torproject.org/.

Structure of this Repository

• broker/ contains code for the Snowflake broker
• doc/ contains Snowflake documentation and manpages
• client/ contains the Tor pluggable transport client and client library code
• common/ contains generic libraries used by multiple pieces of Snowflake
• proxy/ contains code for the Go standalone Snowflake proxy
• probetest/ contains code for a NAT probetesting service
• server/ contains the Tor pluggable transport server and server library code