Add TunnelManager, TunnelResponder, SSH relay server, and SSH relay HTTP
server to the poller startup sequence with env-configurable port ranges,
idle timeouts, and session limits. Extends graceful shutdown to cover the
HTTP server (5s context), tunnel manager, and SSH relay server via defer.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Implements the SSH relay server (Task 2.1) that validates single-use
Redis tokens via GETDEL, dials SSH to the target device with PTY,
and bridges WebSocket binary/text frames to SSH stdin/stdout/stderr
with idle timeout and per-user/per-device session limits.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Implements Manager which orchestrates WinBox tunnel lifecycle: open,
close, idle cleanup, and status queries. Uses PortPool and Tunnel from
Tasks 1.2/1.3. DeviceStore and CredentialCache wired in for Task 1.5.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Implements Tunnel type that listens on a local port, accepts WinBox client
connections, dials the remote RouterOS device, and proxies traffic
bidirectionally. Uses activityReader to atomically update LastActive on
each read for idle timeout detection. Per-connection contexts derive from
the tunnel context so Close() terminates all connections cleanly.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Implements PortPool with mutex-protected allocation, bind verification
to skip ports already in use by the OS, and release-for-reuse semantics.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
