When running on Windows with Wintun, assigning an overlay IPv4 address
via netsh triggers Duplicate Address Detection (DAD). During this tentative
window, binding a UDP socket to the address returns WSAEADDRNOTAVAIL
(os error 10049), causing the agent to prematurely log a false-positive
PluginError ('allocated ... but the address is not on any interface').
Furthermore, Russian TSPU / DPI filters block unrecognized SNIs and
non-standard ALPNs on TCP port 443 with TCP RST injection (os error 10054).
The default 'tsunagi.local' SNI and 'tsunagi-tls/1' ALPN were trivially
fingerprinted.
Key improvements:
- In crates/tsunagi/src/overlay/tun.rs, enhance address_is_local on Windows
to inspect active OS interfaces via netdev::get_interfaces() if UDP
bind fails.
- In crates/tsunagi/src/agent/network.rs, introduce an asynchronous retry
loop in publish_allocations on Windows (up to 1.5s in 150ms intervals)
to gracefully allow DAD and IP helper updates to complete before
reporting missing addresses.
- In crates/tsunagi-tcp-tls, add support for custom SNI domain via
protocol options (-o sni=<domain>), defaulting to 'cloudflare.com'
instead of 'tsunagi.local'.
- Switch TLS ALPN in tsunagi-tcp-tls from 'tsunagi-tls/1' to 'http/1.1'
to camouflage handshake traffic as standard HTTPS web traffic.
- Update tests to verify custom and default SNI behavior.
Validation on Linux:
- cargo fmt --all -- --check passed.
- cargo clippy --locked --workspace --all-targets -- -D warnings passed.
- cargo test --locked --workspace --all-targets passed (348 tests passed).
- cargo build --release passed.
Aleksandr Bogomiakov
e24548b3b0