/** Process a 'created' <b>cell</b> that just arrived from <b>conn</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, or_connection_t *conn)
{
circuit_t *circ;
circ = circuit_get_by_circid_orconn(cell->circ_id, conn);
if (!circ) {
log_info(LD_OR,
"(circID %d) unknown circ (probably got a destroy earlier). "
"Dropping.", cell->circ_id);
return;
}
if (circ->n_circ_id != cell->circ_id) {
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 (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, cell->command,
cell->payload)) < 0) {
log_warn(LD_OR,"circuit_finish_handshake failed.");
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. */
log_debug(LD_OR,
"Converting created cell to extended relay cell, sending.");
relay_send_command_from_edge(0, circ, RELAY_COMMAND_EXTENDED,
(char*)cell->payload, ONIONSKIN_REPLY_LEN,
NULL);
}
}
/** 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) {
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) {
log_warn(LD_OR,"circuit_finish_handshake failed.");
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);
}
}