Simulates a proxy that performs a simple I/O loop on client/server socket.
| 265 | |
| 266 | |
| 267 | class SocketProxyDummyServer(SocketDummyServerTestCase): |
| 268 | """ |
| 269 | Simulates a proxy that performs a simple I/O loop on client/server |
| 270 | socket. |
| 271 | """ |
| 272 | |
| 273 | def __init__( |
| 274 | self, destination_server_host: str, destination_server_port: int |
| 275 | ) -> None: |
| 276 | self.destination_server_host = destination_server_host |
| 277 | self.destination_server_port = destination_server_port |
| 278 | self.server_ctx, _ = server_client_ssl_contexts() |
| 279 | |
| 280 | def start_proxy_handler(self) -> None: |
| 281 | """ |
| 282 | Socket handler for the proxy. Terminates the first TLS layer and tunnels |
| 283 | any bytes needed for client <-> server communicatin. |
| 284 | """ |
| 285 | |
| 286 | def proxy_handler(listener: socket.socket) -> None: |
| 287 | sock = listener.accept()[0] |
| 288 | with self.server_ctx.wrap_socket(sock, server_side=True) as client_sock: |
| 289 | upstream_sock = socket.create_connection( |
| 290 | (self.destination_server_host, self.destination_server_port) |
| 291 | ) |
| 292 | self._read_write_loop(client_sock, upstream_sock) |
| 293 | upstream_sock.close() |
| 294 | client_sock.close() |
| 295 | |
| 296 | self._start_server(proxy_handler) |
| 297 | |
| 298 | def _read_write_loop( |
| 299 | self, |
| 300 | client_sock: socket.socket, |
| 301 | server_sock: socket.socket, |
| 302 | chunks: int = 65536, |
| 303 | ) -> None: |
| 304 | inputs = [client_sock, server_sock] |
| 305 | output = [client_sock, server_sock] |
| 306 | |
| 307 | while inputs: |
| 308 | readable, writable, exception = select.select(inputs, output, inputs) |
| 309 | |
| 310 | if exception: |
| 311 | # Error occurred with either of the sockets, time to |
| 312 | # wrap up, parent func will close sockets. |
| 313 | break |
| 314 | |
| 315 | for s in readable: |
| 316 | read_socket, write_socket = None, None |
| 317 | if s == client_sock: |
| 318 | read_socket = client_sock |
| 319 | write_socket = server_sock |
| 320 | else: |
| 321 | read_socket = server_sock |
| 322 | write_socket = client_sock |
| 323 | |
| 324 | # Ensure buffer is not full before writing |
no outgoing calls