ConnBlob is a compact, URL-safe string that a server gives to clients so they can connect. It is the "tc"-prefixed base64url encoding of CBOR-encoded

DERPMapURL is an option for [ConnInfo.Expand] specifying an alternate URL to fetch the DERP map from instead of [DefaultDERPMapURL].

Client connects to a [Server] over a WireGuard tunnel relayed through DERP. Populate Server (the only required field, or use the [NewClient] shorthand

ConnInfo describes how to reach a server: its public key and which DERP relay region to use. It is serialized into a [ConnBlob] for exchange, via the

DERPMapCache is an option for [ConnInfo.Expand] and [FetchDERPMap] that caches fetched DERP maps. Without one, a process-wide in-memory cache is used;

NodePublic is a wrapper around key.NodePublic just so we can have a slightly smaller CBOR representation without the "np" prefix.

PingResult is the result of a successful [Client.Ping] call.

PrivateKey is a node identity: a private key paired with the connection info needed to reach this node. The DERP region in Public must be populated by

Server listens for clients over a WireGuard tunnel relayed through DERP. Incoming TCP connections are dispatched via [Server.OnTCP] (for connections a

closeWriter is implemented by TCP-like connections (such as [net.TCPConn] and gVisor's gonet.TCPConn) that can shut down just their writing side.

derpMapCache implements [tailcat.DERPMapCache] on disk, in $XDG_CACHE_HOME/tailcat (~/.cache/tailcat on Linux). Each DERP map URL gets a derpmap-<url-

locoBackend is like tailscaled's LocalBackend, but crazier. It serves a similar purpose (to be the hub of the world) but there's no controlclient invo

memDERPMapCache is a process-wide in-memory [DERPMapCache], the default when no cache option is provided.

socksTarget is where a SOCKS5 destination address should be dialed.

testSSHEnv holds the shared state for SSH tests: a tailcat server with SSH enabled and a connected client, all using a localhost DERP relay.

This file defines the CBOR wire types behind [ConnBlob]. They mirror the subset of [ConnInfo] and the tailcfg DERP types that tailcat actually uses, w

wireNode is the wire form of [tailcfg.DERPNode].

wireRegion is the wire form of [tailcfg.DERPRegion].