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Split connection_edge_process_relay_cell() in two functions.
One function does the validation, the other does the handling.
This commit is contained in:
George Kadianakis
parent
54ad92a240
commit
7a032c5e48
@ -1576,6 +1576,403 @@ process_sendme_cell(const relay_header_t *rh, const cell_t *cell,
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return 0;
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}
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/** A helper for connection_edge_process_relay_cell(): Actually handles the
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* cell that we received on the connection.
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*
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* The arguments are the same as in the parent function
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* connection_edge_process_relay_cell(), plus the relay header <b>rh</b> as
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* unpacked by the parent function, and <b>optimistic_data</b> as set by the
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* parent function.
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*/
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static int
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handle_relay_command(cell_t *cell, circuit_t *circ,
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edge_connection_t *conn,
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crypt_path_t *layer_hint,
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relay_header_t *rh,
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int optimistic_data)
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{
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unsigned domain = layer_hint?LD_APP:LD_EXIT;
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int reason;
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tor_assert(rh);
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switch (rh->command) {
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case RELAY_COMMAND_DROP:
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/* Already examined in circpad_deliver_recognized_relay_cell_events */
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return 0;
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case RELAY_COMMAND_PADDING_NEGOTIATE:
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circpad_handle_padding_negotiate(circ, cell);
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return 0;
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case RELAY_COMMAND_PADDING_NEGOTIATED:
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if (circpad_handle_padding_negotiated(circ, cell, layer_hint) == 0)
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circuit_read_valid_data(TO_ORIGIN_CIRCUIT(circ), rh->length);
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return 0;
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}
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/* If this is a padding circuit we don't need to parse any other commands
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* than the padding ones. Just drop them to the floor. */
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if (circ->purpose == CIRCUIT_PURPOSE_C_CIRCUIT_PADDING) {
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log_info(domain, "Ignored cell (%d) that arrived in padding circuit.",
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rh.command);
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return 0;
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}
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switch (rh.command) {
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case RELAY_COMMAND_BEGIN:
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case RELAY_COMMAND_BEGIN_DIR:
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if (layer_hint &&
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circ->purpose != CIRCUIT_PURPOSE_S_REND_JOINED) {
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log_fn(LOG_PROTOCOL_WARN, LD_APP,
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"Relay begin request unsupported at AP. Dropping.");
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return 0;
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}
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if (circ->purpose == CIRCUIT_PURPOSE_S_REND_JOINED &&
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layer_hint != TO_ORIGIN_CIRCUIT(circ)->cpath->prev) {
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log_fn(LOG_PROTOCOL_WARN, LD_APP,
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"Relay begin request to Hidden Service "
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"from intermediary node. Dropping.");
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return 0;
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}
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if (conn) {
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log_fn(LOG_PROTOCOL_WARN, domain,
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"Begin cell for known stream. Dropping.");
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return 0;
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}
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if (rh->command == RELAY_COMMAND_BEGIN_DIR &&
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circ->purpose != CIRCUIT_PURPOSE_S_REND_JOINED) {
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/* Assign this circuit and its app-ward OR connection a unique ID,
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* so that we can measure download times. The local edge and dir
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* connection will be assigned the same ID when they are created
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* and linked. */
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static uint64_t next_id = 0;
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circ->dirreq_id = ++next_id;
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TO_OR_CIRCUIT(circ)->p_chan->dirreq_id = circ->dirreq_id;
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}
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return connection_exit_begin_conn(cell, circ);
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case RELAY_COMMAND_DATA:
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++stats_n_data_cells_received;
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/* Update our circuit-level deliver window that we received a DATA cell.
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* If the deliver window goes below 0, we end the circuit and stream due
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* to a protocol failure. */
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if (sendme_circuit_data_received(circ, layer_hint) < 0) {
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log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
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"(relay data) circ deliver_window below 0. Killing.");
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connection_edge_end_close(conn, END_STREAM_REASON_TORPROTOCOL);
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return -END_CIRC_REASON_TORPROTOCOL;
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}
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/* Consider sending a circuit-level SENDME cell. */
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sendme_circuit_consider_sending(circ, layer_hint);
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if (rh->stream_id == 0) {
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log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL, "Relay data cell with zero "
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"stream_id. Dropping.");
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return 0;
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} else if (!conn) {
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if (CIRCUIT_IS_ORIGIN(circ)) {
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origin_circuit_t *ocirc = TO_ORIGIN_CIRCUIT(circ);
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if (connection_half_edge_is_valid_data(ocirc->half_streams,
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rh->stream_id)) {
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circuit_read_valid_data(ocirc, rh->length);
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log_info(domain,
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"data cell on circ %u valid on half-closed "
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"stream id %d", ocirc->global_identifier, rh->stream_id);
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}
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}
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log_info(domain,"data cell dropped, unknown stream (streamid %d).",
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rh->stream_id);
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return 0;
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}
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/* Update our stream-level deliver window that we just received a DATA
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* cell. Going below 0 means we have a protocol level error so the
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* stream and circuit are closed. */
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if (sendme_stream_data_received(conn) < 0) {
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log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
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"(relay data) conn deliver_window below 0. Killing.");
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connection_edge_end_close(conn, END_STREAM_REASON_TORPROTOCOL);
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return -END_CIRC_REASON_TORPROTOCOL;
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}
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/* Total all valid application bytes delivered */
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if (CIRCUIT_IS_ORIGIN(circ) && rh->length > 0) {
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circuit_read_valid_data(TO_ORIGIN_CIRCUIT(circ), rh->length);
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}
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stats_n_data_bytes_received += rh->length;
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connection_buf_add((char*)(cell->payload + RELAY_HEADER_SIZE),
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rh->length, TO_CONN(conn));
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#ifdef MEASUREMENTS_21206
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/* Count number of RELAY_DATA cells received on a linked directory
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* connection. */
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connection_t *linked_conn = TO_CONN(conn)->linked_conn;
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if (linked_conn && linked_conn->type == CONN_TYPE_DIR) {
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++(TO_DIR_CONN(linked_conn)->data_cells_received);
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}
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#endif /* defined(MEASUREMENTS_21206) */
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if (!optimistic_data) {
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/* Only send a SENDME if we're not getting optimistic data; otherwise
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* a SENDME could arrive before the CONNECTED.
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*/
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sendme_connection_edge_consider_sending(conn);
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}
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return 0;
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case RELAY_COMMAND_END:
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reason = rh->length > 0 ?
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get_uint8(cell->payload+RELAY_HEADER_SIZE) : END_STREAM_REASON_MISC;
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if (!conn) {
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if (CIRCUIT_IS_ORIGIN(circ)) {
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origin_circuit_t *ocirc = TO_ORIGIN_CIRCUIT(circ);
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if (connection_half_edge_is_valid_end(ocirc->half_streams,
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rh->stream_id)) {
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circuit_read_valid_data(ocirc, rh->length);
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log_info(domain,
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"end cell (%s) on circ %u valid on half-closed "
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"stream id %d",
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stream_end_reason_to_string(reason),
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ocirc->global_identifier, rh->stream_id);
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return 0;
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}
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}
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log_info(domain,"end cell (%s) dropped, unknown stream.",
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stream_end_reason_to_string(reason));
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return 0;
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}
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/* XXX add to this log_fn the exit node's nickname? */
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log_info(domain,TOR_SOCKET_T_FORMAT": end cell (%s) for stream %d. "
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"Removing stream.",
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conn->base_.s,
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stream_end_reason_to_string(reason),
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conn->stream_id);
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if (conn->base_.type == CONN_TYPE_AP) {
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entry_connection_t *entry_conn = EDGE_TO_ENTRY_CONN(conn);
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if (entry_conn->socks_request &&
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!entry_conn->socks_request->has_finished)
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log_warn(LD_BUG,
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"open stream hasn't sent socks answer yet? Closing.");
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}
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/* We just *got* an end; no reason to send one. */
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conn->edge_has_sent_end = 1;
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if (!conn->end_reason)
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conn->end_reason = reason | END_STREAM_REASON_FLAG_REMOTE;
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if (!conn->base_.marked_for_close) {
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/* only mark it if not already marked. it's possible to
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* get the 'end' right around when the client hangs up on us. */
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connection_mark_and_flush(TO_CONN(conn));
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/* Total all valid application bytes delivered */
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if (CIRCUIT_IS_ORIGIN(circ)) {
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circuit_read_valid_data(TO_ORIGIN_CIRCUIT(circ), rh->length);
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}
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}
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return 0;
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case RELAY_COMMAND_EXTEND:
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case RELAY_COMMAND_EXTEND2: {
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static uint64_t total_n_extend=0, total_nonearly=0;
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total_n_extend++;
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if (rh->stream_id) {
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log_fn(LOG_PROTOCOL_WARN, domain,
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"'extend' cell received for non-zero stream. Dropping.");
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return 0;
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}
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if (cell->command != CELL_RELAY_EARLY &&
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!networkstatus_get_param(NULL,"AllowNonearlyExtend",0,0,1)) {
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#define EARLY_WARNING_INTERVAL 3600
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static ratelim_t early_warning_limit =
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RATELIM_INIT(EARLY_WARNING_INTERVAL);
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char *m;
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if (cell->command == CELL_RELAY) {
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++total_nonearly;
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if ((m = rate_limit_log(&early_warning_limit, approx_time()))) {
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double percentage = ((double)total_nonearly)/total_n_extend;
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percentage *= 100;
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log_fn(LOG_PROTOCOL_WARN, domain, "EXTEND cell received, "
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"but not via RELAY_EARLY. Dropping.%s", m);
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log_fn(LOG_PROTOCOL_WARN, domain, " (We have dropped %.02f%% of "
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"all EXTEND cells for this reason)", percentage);
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tor_free(m);
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}
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} else {
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log_fn(LOG_WARN, domain,
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"EXTEND cell received, in a cell with type %d! Dropping.",
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cell->command);
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}
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return 0;
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}
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return circuit_extend(cell, circ);
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}
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case RELAY_COMMAND_EXTENDED:
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case RELAY_COMMAND_EXTENDED2:
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if (!layer_hint) {
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log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
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"'extended' unsupported at non-origin. Dropping.");
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return 0;
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}
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log_debug(domain,"Got an extended cell! Yay.");
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{
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extended_cell_t extended_cell;
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if (extended_cell_parse(&extended_cell, rh->command,
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(const uint8_t*)cell->payload+RELAY_HEADER_SIZE,
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rh->length)<0) {
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log_warn(LD_PROTOCOL,
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"Can't parse EXTENDED cell; killing circuit.");
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return -END_CIRC_REASON_TORPROTOCOL;
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}
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if ((reason = circuit_finish_handshake(TO_ORIGIN_CIRCUIT(circ),
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&extended_cell.created_cell)) < 0) {
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circuit_mark_for_close(circ, -reason);
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return 0; /* We don't want to cause a warning, so we mark the circuit
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* here. */
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}
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}
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if ((reason=circuit_send_next_onion_skin(TO_ORIGIN_CIRCUIT(circ)))<0) {
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log_info(domain,"circuit_send_next_onion_skin() failed.");
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return reason;
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}
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/* Total all valid bytes delivered. */
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if (CIRCUIT_IS_ORIGIN(circ)) {
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circuit_read_valid_data(TO_ORIGIN_CIRCUIT(circ), rh->length);
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}
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return 0;
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case RELAY_COMMAND_TRUNCATE:
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if (layer_hint) {
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log_fn(LOG_PROTOCOL_WARN, LD_APP,
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"'truncate' unsupported at origin. Dropping.");
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return 0;
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}
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if (circ->n_hop) {
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if (circ->n_chan)
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log_warn(LD_BUG, "n_chan and n_hop set on the same circuit!");
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extend_info_free(circ->n_hop);
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circ->n_hop = NULL;
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tor_free(circ->n_chan_create_cell);
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circuit_set_state(circ, CIRCUIT_STATE_OPEN);
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}
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if (circ->n_chan) {
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uint8_t trunc_reason = get_uint8(cell->payload + RELAY_HEADER_SIZE);
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circuit_synchronize_written_or_bandwidth(circ, CIRCUIT_N_CHAN);
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circuit_clear_cell_queue(circ, circ->n_chan);
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channel_send_destroy(circ->n_circ_id, circ->n_chan,
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trunc_reason);
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circuit_set_n_circid_chan(circ, 0, NULL);
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}
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log_debug(LD_EXIT, "Processed 'truncate', replying.");
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{
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char payload[1];
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payload[0] = (char)END_CIRC_REASON_REQUESTED;
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relay_send_command_from_edge(0, circ, RELAY_COMMAND_TRUNCATED,
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payload, sizeof(payload), NULL);
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}
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return 0;
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case RELAY_COMMAND_TRUNCATED:
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if (!layer_hint) {
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log_fn(LOG_PROTOCOL_WARN, LD_EXIT,
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"'truncated' unsupported at non-origin. Dropping.");
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return 0;
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}
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/* Count the truncated as valid, for completeness. The
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* circuit is being torn down anyway, though. */
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if (CIRCUIT_IS_ORIGIN(circ)) {
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circuit_read_valid_data(TO_ORIGIN_CIRCUIT(circ),
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rh->length);
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}
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circuit_truncated(TO_ORIGIN_CIRCUIT(circ),
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get_uint8(cell->payload + RELAY_HEADER_SIZE));
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return 0;
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case RELAY_COMMAND_CONNECTED:
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if (conn) {
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log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
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"'connected' unsupported while open. Closing circ.");
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return -END_CIRC_REASON_TORPROTOCOL;
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}
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if (CIRCUIT_IS_ORIGIN(circ)) {
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origin_circuit_t *ocirc = TO_ORIGIN_CIRCUIT(circ);
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if (connection_half_edge_is_valid_connected(ocirc->half_streams,
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rh->stream_id)) {
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circuit_read_valid_data(ocirc, rh->length);
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log_info(domain,
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"connected cell on circ %u valid on half-closed "
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"stream id %d", ocirc->global_identifier, rh->stream_id);
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return 0;
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}
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}
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log_info(domain,
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"'connected' received on circid %u for streamid %d, "
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"no conn attached anymore. Ignoring.",
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(unsigned)circ->n_circ_id, rh->stream_id);
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return 0;
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case RELAY_COMMAND_SENDME:
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return process_sendme_cell(rh, cell, circ, conn, layer_hint, domain);
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case RELAY_COMMAND_RESOLVE:
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if (layer_hint) {
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log_fn(LOG_PROTOCOL_WARN, LD_APP,
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"resolve request unsupported at AP; dropping.");
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return 0;
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} else if (conn) {
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log_fn(LOG_PROTOCOL_WARN, domain,
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"resolve request for known stream; dropping.");
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return 0;
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} else if (circ->purpose != CIRCUIT_PURPOSE_OR) {
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log_fn(LOG_PROTOCOL_WARN, domain,
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"resolve request on circ with purpose %d; dropping",
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circ->purpose);
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return 0;
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}
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connection_exit_begin_resolve(cell, TO_OR_CIRCUIT(circ));
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return 0;
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case RELAY_COMMAND_RESOLVED:
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if (conn) {
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log_fn(LOG_PROTOCOL_WARN, domain,
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"'resolved' unsupported while open. Closing circ.");
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return -END_CIRC_REASON_TORPROTOCOL;
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}
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if (CIRCUIT_IS_ORIGIN(circ)) {
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origin_circuit_t *ocirc = TO_ORIGIN_CIRCUIT(circ);
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if (connection_half_edge_is_valid_resolved(ocirc->half_streams,
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rh->stream_id)) {
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circuit_read_valid_data(ocirc, rh->length);
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log_info(domain,
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"resolved cell on circ %u valid on half-closed "
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"stream id %d", ocirc->global_identifier, rh->stream_id);
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return 0;
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}
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}
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log_info(domain,
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"'resolved' received, no conn attached anymore. Ignoring.");
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return 0;
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case RELAY_COMMAND_ESTABLISH_INTRO:
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case RELAY_COMMAND_ESTABLISH_RENDEZVOUS:
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case RELAY_COMMAND_INTRODUCE1:
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case RELAY_COMMAND_INTRODUCE2:
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case RELAY_COMMAND_INTRODUCE_ACK:
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case RELAY_COMMAND_RENDEZVOUS1:
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case RELAY_COMMAND_RENDEZVOUS2:
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case RELAY_COMMAND_INTRO_ESTABLISHED:
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case RELAY_COMMAND_RENDEZVOUS_ESTABLISHED:
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rend_process_relay_cell(circ, layer_hint,
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rh->command, rh->length,
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cell->payload+RELAY_HEADER_SIZE);
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return 0;
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}
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log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
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"Received unknown relay command %d. Perhaps the other side is using "
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"a newer version of Tor? Dropping.",
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rh->command);
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return 0; /* for forward compatibility, don't kill the circuit */
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}
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/** An incoming relay cell has arrived on circuit <b>circ</b>. If
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* <b>conn</b> is NULL this is a control cell, else <b>cell</b> is
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* destined for <b>conn</b>.
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@ -1593,7 +1990,6 @@ connection_edge_process_relay_cell(cell_t *cell, circuit_t *circ,
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static int num_seen=0;
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relay_header_t rh;
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unsigned domain = layer_hint?LD_APP:LD_EXIT;
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int reason;
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int optimistic_data = 0; /* Set to 1 if we receive data on a stream
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* that's in the EXIT_CONN_STATE_RESOLVING
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* or EXIT_CONN_STATE_CONNECTING states. */
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@ -1652,381 +2048,8 @@ connection_edge_process_relay_cell(cell_t *cell, circuit_t *circ,
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}
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}
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switch (rh.command) {
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||||
case RELAY_COMMAND_DROP:
|
||||
/* Already examined in circpad_deliver_recognized_relay_cell_events */
|
||||
return 0;
|
||||
case RELAY_COMMAND_PADDING_NEGOTIATE:
|
||||
circpad_handle_padding_negotiate(circ, cell);
|
||||
return 0;
|
||||
case RELAY_COMMAND_PADDING_NEGOTIATED:
|
||||
if (circpad_handle_padding_negotiated(circ, cell, layer_hint) == 0)
|
||||
circuit_read_valid_data(TO_ORIGIN_CIRCUIT(circ), rh.length);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* If this is a padding circuit we don't need to parse any other commands
|
||||
* than the padding ones. Just drop them to the floor. */
|
||||
if (circ->purpose == CIRCUIT_PURPOSE_C_CIRCUIT_PADDING) {
|
||||
log_info(domain, "Ignored cell (%d) that arrived in padding circuit.",
|
||||
rh.command);
|
||||
return 0;
|
||||
}
|
||||
|
||||
switch (rh.command) {
|
||||
case RELAY_COMMAND_BEGIN:
|
||||
case RELAY_COMMAND_BEGIN_DIR:
|
||||
if (layer_hint &&
|
||||
circ->purpose != CIRCUIT_PURPOSE_S_REND_JOINED) {
|
||||
log_fn(LOG_PROTOCOL_WARN, LD_APP,
|
||||
"Relay begin request unsupported at AP. Dropping.");
|
||||
return 0;
|
||||
}
|
||||
if (circ->purpose == CIRCUIT_PURPOSE_S_REND_JOINED &&
|
||||
layer_hint != TO_ORIGIN_CIRCUIT(circ)->cpath->prev) {
|
||||
log_fn(LOG_PROTOCOL_WARN, LD_APP,
|
||||
"Relay begin request to Hidden Service "
|
||||
"from intermediary node. Dropping.");
|
||||
return 0;
|
||||
}
|
||||
if (conn) {
|
||||
log_fn(LOG_PROTOCOL_WARN, domain,
|
||||
"Begin cell for known stream. Dropping.");
|
||||
return 0;
|
||||
}
|
||||
if (rh.command == RELAY_COMMAND_BEGIN_DIR &&
|
||||
circ->purpose != CIRCUIT_PURPOSE_S_REND_JOINED) {
|
||||
/* Assign this circuit and its app-ward OR connection a unique ID,
|
||||
* so that we can measure download times. The local edge and dir
|
||||
* connection will be assigned the same ID when they are created
|
||||
* and linked. */
|
||||
static uint64_t next_id = 0;
|
||||
circ->dirreq_id = ++next_id;
|
||||
TO_OR_CIRCUIT(circ)->p_chan->dirreq_id = circ->dirreq_id;
|
||||
}
|
||||
return connection_exit_begin_conn(cell, circ);
|
||||
case RELAY_COMMAND_DATA:
|
||||
++stats_n_data_cells_received;
|
||||
|
||||
/* Update our circuit-level deliver window that we received a DATA cell.
|
||||
* If the deliver window goes below 0, we end the circuit and stream due
|
||||
* to a protocol failure. */
|
||||
if (sendme_circuit_data_received(circ, layer_hint) < 0) {
|
||||
log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
|
||||
"(relay data) circ deliver_window below 0. Killing.");
|
||||
connection_edge_end_close(conn, END_STREAM_REASON_TORPROTOCOL);
|
||||
return -END_CIRC_REASON_TORPROTOCOL;
|
||||
}
|
||||
|
||||
/* Consider sending a circuit-level SENDME cell. */
|
||||
sendme_circuit_consider_sending(circ, layer_hint);
|
||||
|
||||
if (rh.stream_id == 0) {
|
||||
log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL, "Relay data cell with zero "
|
||||
"stream_id. Dropping.");
|
||||
return 0;
|
||||
} else if (!conn) {
|
||||
if (CIRCUIT_IS_ORIGIN(circ)) {
|
||||
origin_circuit_t *ocirc = TO_ORIGIN_CIRCUIT(circ);
|
||||
if (connection_half_edge_is_valid_data(ocirc->half_streams,
|
||||
rh.stream_id)) {
|
||||
circuit_read_valid_data(ocirc, rh.length);
|
||||
log_info(domain,
|
||||
"data cell on circ %u valid on half-closed "
|
||||
"stream id %d", ocirc->global_identifier, rh.stream_id);
|
||||
}
|
||||
}
|
||||
|
||||
log_info(domain,"data cell dropped, unknown stream (streamid %d).",
|
||||
rh.stream_id);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Update our stream-level deliver window that we just received a DATA
|
||||
* cell. Going below 0 means we have a protocol level error so the
|
||||
* stream and circuit are closed. */
|
||||
|
||||
if (sendme_stream_data_received(conn) < 0) {
|
||||
log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
|
||||
"(relay data) conn deliver_window below 0. Killing.");
|
||||
connection_edge_end_close(conn, END_STREAM_REASON_TORPROTOCOL);
|
||||
return -END_CIRC_REASON_TORPROTOCOL;
|
||||
}
|
||||
/* Total all valid application bytes delivered */
|
||||
if (CIRCUIT_IS_ORIGIN(circ) && rh.length > 0) {
|
||||
circuit_read_valid_data(TO_ORIGIN_CIRCUIT(circ), rh.length);
|
||||
}
|
||||
|
||||
stats_n_data_bytes_received += rh.length;
|
||||
connection_buf_add((char*)(cell->payload + RELAY_HEADER_SIZE),
|
||||
rh.length, TO_CONN(conn));
|
||||
|
||||
#ifdef MEASUREMENTS_21206
|
||||
/* Count number of RELAY_DATA cells received on a linked directory
|
||||
* connection. */
|
||||
connection_t *linked_conn = TO_CONN(conn)->linked_conn;
|
||||
|
||||
if (linked_conn && linked_conn->type == CONN_TYPE_DIR) {
|
||||
++(TO_DIR_CONN(linked_conn)->data_cells_received);
|
||||
}
|
||||
#endif /* defined(MEASUREMENTS_21206) */
|
||||
|
||||
if (!optimistic_data) {
|
||||
/* Only send a SENDME if we're not getting optimistic data; otherwise
|
||||
* a SENDME could arrive before the CONNECTED.
|
||||
*/
|
||||
sendme_connection_edge_consider_sending(conn);
|
||||
}
|
||||
|
||||
return 0;
|
||||
case RELAY_COMMAND_END:
|
||||
reason = rh.length > 0 ?
|
||||
get_uint8(cell->payload+RELAY_HEADER_SIZE) : END_STREAM_REASON_MISC;
|
||||
if (!conn) {
|
||||
if (CIRCUIT_IS_ORIGIN(circ)) {
|
||||
origin_circuit_t *ocirc = TO_ORIGIN_CIRCUIT(circ);
|
||||
if (connection_half_edge_is_valid_end(ocirc->half_streams,
|
||||
rh.stream_id)) {
|
||||
|
||||
circuit_read_valid_data(ocirc, rh.length);
|
||||
log_info(domain,
|
||||
"end cell (%s) on circ %u valid on half-closed "
|
||||
"stream id %d",
|
||||
stream_end_reason_to_string(reason),
|
||||
ocirc->global_identifier, rh.stream_id);
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
log_info(domain,"end cell (%s) dropped, unknown stream.",
|
||||
stream_end_reason_to_string(reason));
|
||||
return 0;
|
||||
}
|
||||
/* XXX add to this log_fn the exit node's nickname? */
|
||||
log_info(domain,TOR_SOCKET_T_FORMAT": end cell (%s) for stream %d. "
|
||||
"Removing stream.",
|
||||
conn->base_.s,
|
||||
stream_end_reason_to_string(reason),
|
||||
conn->stream_id);
|
||||
if (conn->base_.type == CONN_TYPE_AP) {
|
||||
entry_connection_t *entry_conn = EDGE_TO_ENTRY_CONN(conn);
|
||||
if (entry_conn->socks_request &&
|
||||
!entry_conn->socks_request->has_finished)
|
||||
log_warn(LD_BUG,
|
||||
"open stream hasn't sent socks answer yet? Closing.");
|
||||
}
|
||||
/* We just *got* an end; no reason to send one. */
|
||||
conn->edge_has_sent_end = 1;
|
||||
if (!conn->end_reason)
|
||||
conn->end_reason = reason | END_STREAM_REASON_FLAG_REMOTE;
|
||||
if (!conn->base_.marked_for_close) {
|
||||
/* only mark it if not already marked. it's possible to
|
||||
* get the 'end' right around when the client hangs up on us. */
|
||||
connection_mark_and_flush(TO_CONN(conn));
|
||||
|
||||
/* Total all valid application bytes delivered */
|
||||
if (CIRCUIT_IS_ORIGIN(circ)) {
|
||||
circuit_read_valid_data(TO_ORIGIN_CIRCUIT(circ), rh.length);
|
||||
}
|
||||
}
|
||||
return 0;
|
||||
case RELAY_COMMAND_EXTEND:
|
||||
case RELAY_COMMAND_EXTEND2: {
|
||||
static uint64_t total_n_extend=0, total_nonearly=0;
|
||||
total_n_extend++;
|
||||
if (rh.stream_id) {
|
||||
log_fn(LOG_PROTOCOL_WARN, domain,
|
||||
"'extend' cell received for non-zero stream. Dropping.");
|
||||
return 0;
|
||||
}
|
||||
if (cell->command != CELL_RELAY_EARLY &&
|
||||
!networkstatus_get_param(NULL,"AllowNonearlyExtend",0,0,1)) {
|
||||
#define EARLY_WARNING_INTERVAL 3600
|
||||
static ratelim_t early_warning_limit =
|
||||
RATELIM_INIT(EARLY_WARNING_INTERVAL);
|
||||
char *m;
|
||||
if (cell->command == CELL_RELAY) {
|
||||
++total_nonearly;
|
||||
if ((m = rate_limit_log(&early_warning_limit, approx_time()))) {
|
||||
double percentage = ((double)total_nonearly)/total_n_extend;
|
||||
percentage *= 100;
|
||||
log_fn(LOG_PROTOCOL_WARN, domain, "EXTEND cell received, "
|
||||
"but not via RELAY_EARLY. Dropping.%s", m);
|
||||
log_fn(LOG_PROTOCOL_WARN, domain, " (We have dropped %.02f%% of "
|
||||
"all EXTEND cells for this reason)", percentage);
|
||||
tor_free(m);
|
||||
}
|
||||
} else {
|
||||
log_fn(LOG_WARN, domain,
|
||||
"EXTEND cell received, in a cell with type %d! Dropping.",
|
||||
cell->command);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
return circuit_extend(cell, circ);
|
||||
}
|
||||
case RELAY_COMMAND_EXTENDED:
|
||||
case RELAY_COMMAND_EXTENDED2:
|
||||
if (!layer_hint) {
|
||||
log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
|
||||
"'extended' unsupported at non-origin. Dropping.");
|
||||
return 0;
|
||||
}
|
||||
log_debug(domain,"Got an extended cell! Yay.");
|
||||
{
|
||||
extended_cell_t extended_cell;
|
||||
if (extended_cell_parse(&extended_cell, rh.command,
|
||||
(const uint8_t*)cell->payload+RELAY_HEADER_SIZE,
|
||||
rh.length)<0) {
|
||||
log_warn(LD_PROTOCOL,
|
||||
"Can't parse EXTENDED cell; killing circuit.");
|
||||
return -END_CIRC_REASON_TORPROTOCOL;
|
||||
}
|
||||
if ((reason = circuit_finish_handshake(TO_ORIGIN_CIRCUIT(circ),
|
||||
&extended_cell.created_cell)) < 0) {
|
||||
circuit_mark_for_close(circ, -reason);
|
||||
return 0; /* We don't want to cause a warning, so we mark the circuit
|
||||
* here. */
|
||||
}
|
||||
}
|
||||
if ((reason=circuit_send_next_onion_skin(TO_ORIGIN_CIRCUIT(circ)))<0) {
|
||||
log_info(domain,"circuit_send_next_onion_skin() failed.");
|
||||
return reason;
|
||||
}
|
||||
/* Total all valid bytes delivered. */
|
||||
if (CIRCUIT_IS_ORIGIN(circ)) {
|
||||
circuit_read_valid_data(TO_ORIGIN_CIRCUIT(circ), rh.length);
|
||||
}
|
||||
return 0;
|
||||
case RELAY_COMMAND_TRUNCATE:
|
||||
if (layer_hint) {
|
||||
log_fn(LOG_PROTOCOL_WARN, LD_APP,
|
||||
"'truncate' unsupported at origin. Dropping.");
|
||||
return 0;
|
||||
}
|
||||
if (circ->n_hop) {
|
||||
if (circ->n_chan)
|
||||
log_warn(LD_BUG, "n_chan and n_hop set on the same circuit!");
|
||||
extend_info_free(circ->n_hop);
|
||||
circ->n_hop = NULL;
|
||||
tor_free(circ->n_chan_create_cell);
|
||||
circuit_set_state(circ, CIRCUIT_STATE_OPEN);
|
||||
}
|
||||
if (circ->n_chan) {
|
||||
uint8_t trunc_reason = get_uint8(cell->payload + RELAY_HEADER_SIZE);
|
||||
circuit_synchronize_written_or_bandwidth(circ, CIRCUIT_N_CHAN);
|
||||
circuit_clear_cell_queue(circ, circ->n_chan);
|
||||
channel_send_destroy(circ->n_circ_id, circ->n_chan,
|
||||
trunc_reason);
|
||||
circuit_set_n_circid_chan(circ, 0, NULL);
|
||||
}
|
||||
log_debug(LD_EXIT, "Processed 'truncate', replying.");
|
||||
{
|
||||
char payload[1];
|
||||
payload[0] = (char)END_CIRC_REASON_REQUESTED;
|
||||
relay_send_command_from_edge(0, circ, RELAY_COMMAND_TRUNCATED,
|
||||
payload, sizeof(payload), NULL);
|
||||
}
|
||||
return 0;
|
||||
case RELAY_COMMAND_TRUNCATED:
|
||||
if (!layer_hint) {
|
||||
log_fn(LOG_PROTOCOL_WARN, LD_EXIT,
|
||||
"'truncated' unsupported at non-origin. Dropping.");
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Count the truncated as valid, for completeness. The
|
||||
* circuit is being torn down anyway, though. */
|
||||
if (CIRCUIT_IS_ORIGIN(circ)) {
|
||||
circuit_read_valid_data(TO_ORIGIN_CIRCUIT(circ),
|
||||
rh.length);
|
||||
}
|
||||
circuit_truncated(TO_ORIGIN_CIRCUIT(circ),
|
||||
get_uint8(cell->payload + RELAY_HEADER_SIZE));
|
||||
return 0;
|
||||
case RELAY_COMMAND_CONNECTED:
|
||||
if (conn) {
|
||||
log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
|
||||
"'connected' unsupported while open. Closing circ.");
|
||||
return -END_CIRC_REASON_TORPROTOCOL;
|
||||
}
|
||||
|
||||
if (CIRCUIT_IS_ORIGIN(circ)) {
|
||||
origin_circuit_t *ocirc = TO_ORIGIN_CIRCUIT(circ);
|
||||
if (connection_half_edge_is_valid_connected(ocirc->half_streams,
|
||||
rh.stream_id)) {
|
||||
circuit_read_valid_data(ocirc, rh.length);
|
||||
log_info(domain,
|
||||
"connected cell on circ %u valid on half-closed "
|
||||
"stream id %d", ocirc->global_identifier, rh.stream_id);
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
log_info(domain,
|
||||
"'connected' received on circid %u for streamid %d, "
|
||||
"no conn attached anymore. Ignoring.",
|
||||
(unsigned)circ->n_circ_id, rh.stream_id);
|
||||
return 0;
|
||||
case RELAY_COMMAND_SENDME:
|
||||
return process_sendme_cell(&rh, cell, circ, conn, layer_hint, domain);
|
||||
case RELAY_COMMAND_RESOLVE:
|
||||
if (layer_hint) {
|
||||
log_fn(LOG_PROTOCOL_WARN, LD_APP,
|
||||
"resolve request unsupported at AP; dropping.");
|
||||
return 0;
|
||||
} else if (conn) {
|
||||
log_fn(LOG_PROTOCOL_WARN, domain,
|
||||
"resolve request for known stream; dropping.");
|
||||
return 0;
|
||||
} else if (circ->purpose != CIRCUIT_PURPOSE_OR) {
|
||||
log_fn(LOG_PROTOCOL_WARN, domain,
|
||||
"resolve request on circ with purpose %d; dropping",
|
||||
circ->purpose);
|
||||
return 0;
|
||||
}
|
||||
connection_exit_begin_resolve(cell, TO_OR_CIRCUIT(circ));
|
||||
return 0;
|
||||
case RELAY_COMMAND_RESOLVED:
|
||||
if (conn) {
|
||||
log_fn(LOG_PROTOCOL_WARN, domain,
|
||||
"'resolved' unsupported while open. Closing circ.");
|
||||
return -END_CIRC_REASON_TORPROTOCOL;
|
||||
}
|
||||
|
||||
if (CIRCUIT_IS_ORIGIN(circ)) {
|
||||
origin_circuit_t *ocirc = TO_ORIGIN_CIRCUIT(circ);
|
||||
if (connection_half_edge_is_valid_resolved(ocirc->half_streams,
|
||||
rh.stream_id)) {
|
||||
circuit_read_valid_data(ocirc, rh.length);
|
||||
log_info(domain,
|
||||
"resolved cell on circ %u valid on half-closed "
|
||||
"stream id %d", ocirc->global_identifier, rh.stream_id);
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
log_info(domain,
|
||||
"'resolved' received, no conn attached anymore. Ignoring.");
|
||||
return 0;
|
||||
case RELAY_COMMAND_ESTABLISH_INTRO:
|
||||
case RELAY_COMMAND_ESTABLISH_RENDEZVOUS:
|
||||
case RELAY_COMMAND_INTRODUCE1:
|
||||
case RELAY_COMMAND_INTRODUCE2:
|
||||
case RELAY_COMMAND_INTRODUCE_ACK:
|
||||
case RELAY_COMMAND_RENDEZVOUS1:
|
||||
case RELAY_COMMAND_RENDEZVOUS2:
|
||||
case RELAY_COMMAND_INTRO_ESTABLISHED:
|
||||
case RELAY_COMMAND_RENDEZVOUS_ESTABLISHED:
|
||||
rend_process_relay_cell(circ, layer_hint,
|
||||
rh.command, rh.length,
|
||||
cell->payload+RELAY_HEADER_SIZE);
|
||||
return 0;
|
||||
}
|
||||
log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
|
||||
"Received unknown relay command %d. Perhaps the other side is using "
|
||||
"a newer version of Tor? Dropping.",
|
||||
rh.command);
|
||||
return 0; /* for forward compatibility, don't kill the circuit */
|
||||
return handle_relay_command(cell, circ, conn, layer_hint,
|
||||
&rh, optimistic_data);
|
||||
}
|
||||
|
||||
/** How many relay_data cells have we built, ever? */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user