Module stun 

STUN protocol implementation for public IP detection

Implements a minimal RFC 5389 STUN client for detecting public IP addresses.

Limitations

• No retransmission: RFC 5389 §7.2.1 recommends retransmitting requests with exponential backoff (RTO ≥ 500 ms). This implementation sends a single binding request; packet loss is handled by the resolver’s fallback strategy.

Security

Transaction IDs are generated with getrandom (OS-level CSPRNG), per RFC 8489 requirements.

Structs

StunProvider

STUN provider for IP detection

Functions

default_providers

Get default STUN providers

provider_names

List all available STUN provider names