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-/* Copyright (c) 2001 Matej Pfajfar.
- * Copyright (c) 2001-2004, Roger Dingledine.
- * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
- * Copyright (c) 2007-2018, The Tor Project, Inc. */
-/* See LICENSE for licensing information */
-
-/**
- * \file command.c
- * \brief Functions for processing incoming cells.
- *
- * When we receive a cell from a client or a relay, it arrives on some
- * channel, and tells us what to do with it. In this module, we dispatch based
- * on the cell type using the functions command_process_cell() and
- * command_process_var_cell(), and deal with the cell accordingly. (These
- * handlers are installed on a channel with the command_setup_channel()
- * function.)
- *
- * Channels have a chance to handle some cell types on their own before they
- * are ever passed here --- typically, they do this for cells that are
- * specific to a given channel type. For example, in channeltls.c, the cells
- * for the initial connection handshake are handled before we get here. (Of
- * course, the fact that there _is_ only one channel type for now means that
- * we may have gotten the factoring wrong here.)
- *
- * Handling other cell types is mainly farmed off to other modules, after
- * initial sanity-checking. CREATE* cells are handled ultimately in onion.c,
- * CREATED* cells trigger circuit creation in circuitbuild.c, DESTROY cells
- * are handled here (since they're simple), and RELAY cells, in all their
- * complexity, are passed off to relay.c.
- **/
-
-/* In-points to command.c:
- *
- * - command_process_cell(), called from
- * incoming cell handlers of channel_t instances;
- * callbacks registered in command_setup_channel(),
- * called when channels are created in circuitbuild.c
- */
-#include "or/or.h"
-#include "or/channel.h"
-#include "or/circuitbuild.h"
-#include "or/circuitlist.h"
-#include "or/command.h"
-#include "or/connection.h"
-#include "or/connection_or.h"
-#include "or/config.h"
-#include "or/control.h"
-#include "or/cpuworker.h"
-#include "lib/crypt_ops/crypto_util.h"
-#include "or/dos.h"
-#include "or/hibernate.h"
-#include "or/nodelist.h"
-#include "or/onion.h"
-#include "or/rephist.h"
-#include "or/relay.h"
-#include "or/router.h"
-#include "or/routerlist.h"
-
-#include "or/cell_st.h"
-#include "or/or_circuit_st.h"
-#include "or/origin_circuit_st.h"
-#include "or/var_cell_st.h"
-
-/** How many CELL_CREATE cells have we received, ever? */
-uint64_t stats_n_create_cells_processed = 0;
-/** How many CELL_CREATED cells have we received, ever? */
-uint64_t stats_n_created_cells_processed = 0;
-/** How many CELL_RELAY cells have we received, ever? */
-uint64_t stats_n_relay_cells_processed = 0;
-/** How many CELL_DESTROY cells have we received, ever? */
-uint64_t stats_n_destroy_cells_processed = 0;
-
-/* Handle an incoming channel */
-static void command_handle_incoming_channel(channel_listener_t *listener,
- channel_t *chan);
-
-/* These are the main functions for processing cells */
-static void command_process_create_cell(cell_t *cell, channel_t *chan);
-static void command_process_created_cell(cell_t *cell, channel_t *chan);
-static void command_process_relay_cell(cell_t *cell, channel_t *chan);
-static void command_process_destroy_cell(cell_t *cell, channel_t *chan);
-
-/** Convert the cell <b>command</b> into a lower-case, human-readable
- * string. */
-const char *
-cell_command_to_string(uint8_t command)
-{
- switch (command) {
- case CELL_PADDING: return "padding";
- case CELL_CREATE: return "create";
- case CELL_CREATED: return "created";
- case CELL_RELAY: return "relay";
- case CELL_DESTROY: return "destroy";
- case CELL_CREATE_FAST: return "create_fast";
- case CELL_CREATED_FAST: return "created_fast";
- case CELL_VERSIONS: return "versions";
- case CELL_NETINFO: return "netinfo";
- case CELL_RELAY_EARLY: return "relay_early";
- case CELL_CREATE2: return "create2";
- case CELL_CREATED2: return "created2";
- case CELL_VPADDING: return "vpadding";
- case CELL_CERTS: return "certs";
- case CELL_AUTH_CHALLENGE: return "auth_challenge";
- case CELL_AUTHENTICATE: return "authenticate";
- case CELL_AUTHORIZE: return "authorize";
- default: return "unrecognized";
- }
-}
-
-#ifdef KEEP_TIMING_STATS
-/** This is a wrapper function around the actual function that processes the
- * <b>cell</b> that just arrived on <b>conn</b>. Increment <b>*time</b>
- * by the number of microseconds used by the call to <b>*func(cell, conn)</b>.
- */
-static void
-command_time_process_cell(cell_t *cell, channel_t *chan, int *time,
- void (*func)(cell_t *, channel_t *))
-{
- struct timeval start, end;
- long time_passed;
-
- tor_gettimeofday(&start);
-
- (*func)(cell, chan);
-
- tor_gettimeofday(&end);
- time_passed = tv_udiff(&start, &end) ;
-
- if (time_passed > 10000) { /* more than 10ms */
- log_debug(LD_OR,"That call just took %ld ms.",time_passed/1000);
- }
- if (time_passed < 0) {
- log_info(LD_GENERAL,"That call took us back in time!");
- time_passed = 0;
- }
- *time += time_passed;
-}
-#endif /* defined(KEEP_TIMING_STATS) */
-
-/** Process a <b>cell</b> that was just received on <b>chan</b>. Keep internal
- * statistics about how many of each cell we've processed so far
- * this second, and the total number of microseconds it took to
- * process each type of cell.
- */
-void
-command_process_cell(channel_t *chan, cell_t *cell)
-{
-#ifdef KEEP_TIMING_STATS
- /* how many of each cell have we seen so far this second? needs better
- * name. */
- static int num_create=0, num_created=0, num_relay=0, num_destroy=0;
- /* how long has it taken to process each type of cell? */
- static int create_time=0, created_time=0, relay_time=0, destroy_time=0;
- static time_t current_second = 0; /* from previous calls to time */
-
- time_t now = time(NULL);
-
- if (now > current_second) { /* the second has rolled over */
- /* print stats */
- log_info(LD_OR,
- "At end of second: %d creates (%d ms), %d createds (%d ms), "
- "%d relays (%d ms), %d destroys (%d ms)",
- num_create, create_time/1000,
- num_created, created_time/1000,
- num_relay, relay_time/1000,
- num_destroy, destroy_time/1000);
-
- /* zero out stats */
- num_create = num_created = num_relay = num_destroy = 0;
- create_time = created_time = relay_time = destroy_time = 0;
-
- /* remember which second it is, for next time */
- current_second = now;
- }
-#endif /* defined(KEEP_TIMING_STATS) */
-
-#ifdef KEEP_TIMING_STATS
-#define PROCESS_CELL(tp, cl, cn) STMT_BEGIN { \
- ++num ## tp; \
- command_time_process_cell(cl, cn, & tp ## time , \
- command_process_ ## tp ## _cell); \
- } STMT_END
-#else /* !(defined(KEEP_TIMING_STATS)) */
-#define PROCESS_CELL(tp, cl, cn) command_process_ ## tp ## _cell(cl, cn)
-#endif /* defined(KEEP_TIMING_STATS) */
-
- switch (cell->command) {
- case CELL_CREATE:
- case CELL_CREATE_FAST:
- case CELL_CREATE2:
- ++stats_n_create_cells_processed;
- PROCESS_CELL(create, cell, chan);
- break;
- case CELL_CREATED:
- case CELL_CREATED_FAST:
- case CELL_CREATED2:
- ++stats_n_created_cells_processed;
- PROCESS_CELL(created, cell, chan);
- break;
- case CELL_RELAY:
- case CELL_RELAY_EARLY:
- ++stats_n_relay_cells_processed;
- PROCESS_CELL(relay, cell, chan);
- break;
- case CELL_DESTROY:
- ++stats_n_destroy_cells_processed;
- PROCESS_CELL(destroy, cell, chan);
- break;
- default:
- log_fn(LOG_INFO, LD_PROTOCOL,
- "Cell of unknown or unexpected type (%d) received. "
- "Dropping.",
- cell->command);
- break;
- }
-}
-
-/** Process an incoming var_cell from a channel; in the current protocol all
- * the var_cells are handshake-related and handled below the channel layer,
- * so this just logs a warning and drops the cell.
- */
-
-void
-command_process_var_cell(channel_t *chan, var_cell_t *var_cell)
-{
- tor_assert(chan);
- tor_assert(var_cell);
-
- log_info(LD_PROTOCOL,
- "Received unexpected var_cell above the channel layer of type %d"
- "; dropping it.",
- var_cell->command);
-}
-
-/** Process a 'create' <b>cell</b> that just arrived from <b>chan</b>. Make a
- * new circuit with the p_circ_id specified in cell. Put the circuit in state
- * onionskin_pending, and pass the onionskin to the cpuworker. Circ will get
- * picked up again when the cpuworker finishes decrypting it.
- */
-static void
-command_process_create_cell(cell_t *cell, channel_t *chan)
-{
- or_circuit_t *circ;
- const or_options_t *options = get_options();
- int id_is_high;
- create_cell_t *create_cell;
-
- tor_assert(cell);
- tor_assert(chan);
-
- log_debug(LD_OR,
- "Got a CREATE cell for circ_id %u on channel %"PRIu64
- " (%p)",
- (unsigned)cell->circ_id,
- (chan->global_identifier), chan);
-
- /* First thing we do, even though the cell might be invalid, is inform the
- * DoS mitigation subsystem layer of this event. Validation is done by this
- * function. */
- dos_cc_new_create_cell(chan);
-
- /* We check for the conditions that would make us drop the cell before
- * we check for the conditions that would make us send a DESTROY back,
- * since those conditions would make a DESTROY nonsensical. */
- if (cell->circ_id == 0) {
- log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
- "Received a create cell (type %d) from %s with zero circID; "
- " ignoring.", (int)cell->command,
- channel_get_actual_remote_descr(chan));
- return;
- }
-
- if (circuit_id_in_use_on_channel(cell->circ_id, chan)) {
- const node_t *node = node_get_by_id(chan->identity_digest);
- log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
- "Received CREATE cell (circID %u) for known circ. "
- "Dropping (age %d).",
- (unsigned)cell->circ_id,
- (int)(time(NULL) - channel_when_created(chan)));
- if (node) {
- char *p = esc_for_log(node_get_platform(node));
- log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
- "Details: router %s, platform %s.",
- node_describe(node), p);
- tor_free(p);
- }
- return;
- }
-
- if (we_are_hibernating()) {
- log_info(LD_OR,
- "Received create cell but we're shutting down. Sending back "
- "destroy.");
- channel_send_destroy(cell->circ_id, chan,
- END_CIRC_REASON_HIBERNATING);
- return;
- }
-
- /* Check if we should apply a defense for this channel. */
- if (dos_cc_get_defense_type(chan) == DOS_CC_DEFENSE_REFUSE_CELL) {
- channel_send_destroy(cell->circ_id, chan,
- END_CIRC_REASON_RESOURCELIMIT);
- return;
- }
-
- if (!server_mode(options) ||
- (!public_server_mode(options) && channel_is_outgoing(chan))) {
- log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
- "Received create cell (type %d) from %s, but we're connected "
- "to it as a client. "
- "Sending back a destroy.",
- (int)cell->command, channel_get_canonical_remote_descr(chan));
- channel_send_destroy(cell->circ_id, chan,
- END_CIRC_REASON_TORPROTOCOL);
- return;
- }
-
- /* If the high bit of the circuit ID is not as expected, close the
- * circ. */
- if (chan->wide_circ_ids)
- id_is_high = cell->circ_id & (1u<<31);
- else
- id_is_high = cell->circ_id & (1u<<15);
- if ((id_is_high &&
- chan->circ_id_type == CIRC_ID_TYPE_HIGHER) ||
- (!id_is_high &&
- chan->circ_id_type == CIRC_ID_TYPE_LOWER)) {
- log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
- "Received create cell with unexpected circ_id %u. Closing.",
- (unsigned)cell->circ_id);
- channel_send_destroy(cell->circ_id, chan,
- END_CIRC_REASON_TORPROTOCOL);
- return;
- }
-
- circ = or_circuit_new(cell->circ_id, chan);
- circ->base_.purpose = CIRCUIT_PURPOSE_OR;
- circuit_set_state(TO_CIRCUIT(circ), CIRCUIT_STATE_ONIONSKIN_PENDING);
- create_cell = tor_malloc_zero(sizeof(create_cell_t));
- if (create_cell_parse(create_cell, cell) < 0) {
- tor_free(create_cell);
- log_fn(LOG_PROTOCOL_WARN, LD_OR,
- "Bogus/unrecognized create cell; closing.");
- circuit_mark_for_close(TO_CIRCUIT(circ), END_CIRC_REASON_TORPROTOCOL);
- return;
- }
-
- if (!channel_is_client(chan)) {
- /* remember create types we've seen, but don't remember them from
- * clients, to be extra conservative about client statistics. */
- rep_hist_note_circuit_handshake_requested(create_cell->handshake_type);
- }
-
- if (create_cell->handshake_type != ONION_HANDSHAKE_TYPE_FAST) {
- /* hand it off to the cpuworkers, and then return. */
-
- if (assign_onionskin_to_cpuworker(circ, create_cell) < 0) {
- log_debug(LD_GENERAL,"Failed to hand off onionskin. Closing.");
- circuit_mark_for_close(TO_CIRCUIT(circ), END_CIRC_REASON_RESOURCELIMIT);
- return;
- }
- log_debug(LD_OR,"success: handed off onionskin.");
- } else {
- /* This is a CREATE_FAST cell; we can handle it immediately without using
- * a CPU worker. */
- uint8_t keys[CPATH_KEY_MATERIAL_LEN];
- uint8_t rend_circ_nonce[DIGEST_LEN];
- int len;
- created_cell_t created_cell;
-
- memset(&created_cell, 0, sizeof(created_cell));
- len = onion_skin_server_handshake(ONION_HANDSHAKE_TYPE_FAST,
- create_cell->onionskin,
- create_cell->handshake_len,
- NULL,
- created_cell.reply,
- keys, CPATH_KEY_MATERIAL_LEN,
- rend_circ_nonce);
- tor_free(create_cell);
- if (len < 0) {
- log_warn(LD_OR,"Failed to generate key material. Closing.");
- circuit_mark_for_close(TO_CIRCUIT(circ), END_CIRC_REASON_INTERNAL);
- return;
- }
- created_cell.cell_type = CELL_CREATED_FAST;
- created_cell.handshake_len = len;
-
- if (onionskin_answer(circ, &created_cell,
- (const char *)keys, sizeof(keys),
- rend_circ_nonce)<0) {
- log_warn(LD_OR,"Failed to reply to CREATE_FAST cell. Closing.");
- circuit_mark_for_close(TO_CIRCUIT(circ), END_CIRC_REASON_INTERNAL);
- return;
- }
- memwipe(keys, 0, sizeof(keys));
- }
-}
-
-/** Process a 'created' <b>cell</b> that just arrived from <b>chan</b>.
- * Find the circuit
- * that it's intended for. If we're not the origin of the circuit, package
- * the 'created' cell in an 'extended' relay cell and pass it back. If we
- * are the origin of the circuit, send it to circuit_finish_handshake() to
- * finish processing keys, and then call circuit_send_next_onion_skin() to
- * extend to the next hop in the circuit if necessary.
- */
-static void
-command_process_created_cell(cell_t *cell, channel_t *chan)
-{
- circuit_t *circ;
- extended_cell_t extended_cell;
-
- circ = circuit_get_by_circid_channel(cell->circ_id, chan);
-
- if (!circ) {
- log_info(LD_OR,
- "(circID %u) unknown circ (probably got a destroy earlier). "
- "Dropping.", (unsigned)cell->circ_id);
- return;
- }
-
- if (circ->n_circ_id != cell->circ_id || circ->n_chan != chan) {
- log_fn(LOG_PROTOCOL_WARN,LD_PROTOCOL,
- "got created cell from Tor client? Closing.");
- circuit_mark_for_close(circ, END_CIRC_REASON_TORPROTOCOL);
- return;
- }
-
- if (created_cell_parse(&extended_cell.created_cell, cell) < 0) {
- log_fn(LOG_PROTOCOL_WARN, LD_OR, "Unparseable created cell.");
- circuit_mark_for_close(circ, END_CIRC_REASON_TORPROTOCOL);
- return;
- }
-
- if (CIRCUIT_IS_ORIGIN(circ)) { /* we're the OP. Handshake this. */
- origin_circuit_t *origin_circ = TO_ORIGIN_CIRCUIT(circ);
- int err_reason = 0;
- log_debug(LD_OR,"at OP. Finishing handshake.");
- if ((err_reason = circuit_finish_handshake(origin_circ,
- &extended_cell.created_cell)) < 0) {
- circuit_mark_for_close(circ, -err_reason);
- return;
- }
- log_debug(LD_OR,"Moving to next skin.");
- if ((err_reason = circuit_send_next_onion_skin(origin_circ)) < 0) {
- log_info(LD_OR,"circuit_send_next_onion_skin failed.");
- /* XXX push this circuit_close lower */
- circuit_mark_for_close(circ, -err_reason);
- return;
- }
- } else { /* pack it into an extended relay cell, and send it. */
- uint8_t command=0;
- uint16_t len=0;
- uint8_t payload[RELAY_PAYLOAD_SIZE];
- log_debug(LD_OR,
- "Converting created cell to extended relay cell, sending.");
- memset(payload, 0, sizeof(payload));
- if (extended_cell.created_cell.cell_type == CELL_CREATED2)
- extended_cell.cell_type = RELAY_COMMAND_EXTENDED2;
- else
- extended_cell.cell_type = RELAY_COMMAND_EXTENDED;
- if (extended_cell_format(&command, &len, payload, &extended_cell) < 0) {
- log_fn(LOG_PROTOCOL_WARN, LD_OR, "Can't format extended cell.");
- circuit_mark_for_close(circ, END_CIRC_REASON_TORPROTOCOL);
- return;
- }
-
- relay_send_command_from_edge(0, circ, command,
- (const char*)payload, len, NULL);
- }
-}
-
-/** Process a 'relay' or 'relay_early' <b>cell</b> that just arrived from
- * <b>conn</b>. Make sure it came in with a recognized circ_id. Pass it on to
- * circuit_receive_relay_cell() for actual processing.
- */
-static void
-command_process_relay_cell(cell_t *cell, channel_t *chan)
-{
- const or_options_t *options = get_options();
- circuit_t *circ;
- int reason, direction;
-
- circ = circuit_get_by_circid_channel(cell->circ_id, chan);
-
- if (!circ) {
- log_debug(LD_OR,
- "unknown circuit %u on connection from %s. Dropping.",
- (unsigned)cell->circ_id,
- channel_get_canonical_remote_descr(chan));
- return;
- }
-
- if (circ->state == CIRCUIT_STATE_ONIONSKIN_PENDING) {
- log_fn(LOG_PROTOCOL_WARN,LD_PROTOCOL,"circuit in create_wait. Closing.");
- circuit_mark_for_close(circ, END_CIRC_REASON_TORPROTOCOL);
- return;
- }
-
- if (CIRCUIT_IS_ORIGIN(circ)) {
- /* if we're a relay and treating connections with recent local
- * traffic better, then this is one of them. */
- channel_timestamp_client(chan);
-
- /* Count all circuit bytes here for control port accuracy. We want
- * to count even invalid/dropped relay cells, hence counting
- * before the recognized check and the connection_edge_process_relay
- * cell checks.
- */
- origin_circuit_t *ocirc = TO_ORIGIN_CIRCUIT(circ);
-
- /* Count the payload bytes only. We don't care about cell headers */
- ocirc->n_read_circ_bw = tor_add_u32_nowrap(ocirc->n_read_circ_bw,
- CELL_PAYLOAD_SIZE);
- }
-
- if (!CIRCUIT_IS_ORIGIN(circ) &&
- chan == TO_OR_CIRCUIT(circ)->p_chan &&
- cell->circ_id == TO_OR_CIRCUIT(circ)->p_circ_id)
- direction = CELL_DIRECTION_OUT;
- else
- direction = CELL_DIRECTION_IN;
-
- /* If we have a relay_early cell, make sure that it's outbound, and we've
- * gotten no more than MAX_RELAY_EARLY_CELLS_PER_CIRCUIT of them. */
- if (cell->command == CELL_RELAY_EARLY) {
- if (direction == CELL_DIRECTION_IN) {
- /* Inbound early cells could once be encountered as a result of
- * bug 1038; but relays running versions before 0.2.1.19 are long
- * gone from the network, so any such cells now are surprising. */
- log_warn(LD_OR,
- "Received an inbound RELAY_EARLY cell on circuit %u."
- " Closing circuit. Please report this event,"
- " along with the following message.",
- (unsigned)cell->circ_id);
- if (CIRCUIT_IS_ORIGIN(circ)) {
- circuit_log_path(LOG_WARN, LD_OR, TO_ORIGIN_CIRCUIT(circ));
- } else if (circ->n_chan) {
- log_warn(LD_OR, " upstream=%s",
- channel_get_actual_remote_descr(circ->n_chan));
- }
- circuit_mark_for_close(circ, END_CIRC_REASON_TORPROTOCOL);
- return;
- } else {
- or_circuit_t *or_circ = TO_OR_CIRCUIT(circ);
- if (or_circ->remaining_relay_early_cells == 0) {
- log_fn(LOG_PROTOCOL_WARN, LD_OR,
- "Received too many RELAY_EARLY cells on circ %u from %s."
- " Closing circuit.",
- (unsigned)cell->circ_id,
- safe_str(channel_get_canonical_remote_descr(chan)));
- circuit_mark_for_close(circ, END_CIRC_REASON_TORPROTOCOL);
- return;
- }
- --or_circ->remaining_relay_early_cells;
- }
- }
-
- if ((reason = circuit_receive_relay_cell(cell, circ, direction)) < 0) {
- log_fn(LOG_PROTOCOL_WARN,LD_PROTOCOL,"circuit_receive_relay_cell "
- "(%s) failed. Closing.",
- direction==CELL_DIRECTION_OUT?"forward":"backward");
- circuit_mark_for_close(circ, -reason);
- }
-
- /* If this is a cell in an RP circuit, count it as part of the
- hidden service stats */
- if (options->HiddenServiceStatistics &&
- !CIRCUIT_IS_ORIGIN(circ) &&
- TO_OR_CIRCUIT(circ)->circuit_carries_hs_traffic_stats) {
- rep_hist_seen_new_rp_cell();
- }
-}
-
-/** Process a 'destroy' <b>cell</b> that just arrived from
- * <b>chan</b>. Find the circ that it refers to (if any).
- *
- * If the circ is in state
- * onionskin_pending, then call onion_pending_remove() to remove it
- * from the pending onion list (note that if it's already being
- * processed by the cpuworker, it won't be in the list anymore; but
- * when the cpuworker returns it, the circuit will be gone, and the
- * cpuworker response will be dropped).
- *
- * Then mark the circuit for close (which marks all edges for close,
- * and passes the destroy cell onward if necessary).
- */
-static void
-command_process_destroy_cell(cell_t *cell, channel_t *chan)
-{
- circuit_t *circ;
- int reason;
-
- circ = circuit_get_by_circid_channel(cell->circ_id, chan);
- if (!circ) {
- log_info(LD_OR,"unknown circuit %u on connection from %s. Dropping.",
- (unsigned)cell->circ_id,
- channel_get_canonical_remote_descr(chan));
- return;
- }
- log_debug(LD_OR,"Received for circID %u.",(unsigned)cell->circ_id);
-
- reason = (uint8_t)cell->payload[0];
- circ->received_destroy = 1;
-
- if (!CIRCUIT_IS_ORIGIN(circ) &&
- chan == TO_OR_CIRCUIT(circ)->p_chan &&
- cell->circ_id == TO_OR_CIRCUIT(circ)->p_circ_id) {
- /* the destroy came from behind */
- circuit_set_p_circid_chan(TO_OR_CIRCUIT(circ), 0, NULL);
- circuit_mark_for_close(circ, reason|END_CIRC_REASON_FLAG_REMOTE);
- } else { /* the destroy came from ahead */
- circuit_set_n_circid_chan(circ, 0, NULL);
- if (CIRCUIT_IS_ORIGIN(circ)) {
- circuit_mark_for_close(circ, reason|END_CIRC_REASON_FLAG_REMOTE);
- } else {
- char payload[1];
- log_debug(LD_OR, "Delivering 'truncated' back.");
- payload[0] = (char)reason;
- relay_send_command_from_edge(0, circ, RELAY_COMMAND_TRUNCATED,
- payload, sizeof(payload), NULL);
- }
- }
-}
-
-/** Callback to handle a new channel; call command_setup_channel() to give
- * it the right cell handlers.
- */
-
-static void
-command_handle_incoming_channel(channel_listener_t *listener, channel_t *chan)
-{
- tor_assert(listener);
- tor_assert(chan);
-
- command_setup_channel(chan);
-}
-
-/** Given a channel, install the right handlers to process incoming
- * cells on it.
- */
-
-void
-command_setup_channel(channel_t *chan)
-{
- tor_assert(chan);
-
- channel_set_cell_handlers(chan,
- command_process_cell,
- command_process_var_cell);
-}
-
-/** Given a listener, install the right handler to process incoming
- * channels on it.
- */
-
-void
-command_setup_listener(channel_listener_t *listener)
-{
- tor_assert(listener);
- tor_assert(listener->state == CHANNEL_LISTENER_STATE_LISTENING);
-
- channel_listener_set_listener_fn(listener, command_handle_incoming_channel);
-}
-
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