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https://gitlab.torproject.org/tpo/core/tor.git
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961ecf7abf
verify it at the client end abstract the onionskin handshake lengths breaks backward compatibility (again) svn:r941
227 lines
7.3 KiB
C
227 lines
7.3 KiB
C
/* Copyright 2001,2002,2003 Roger Dingledine, Matej Pfajfar. */
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/* See LICENSE for licensing information */
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/* $Id$ */
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#include "or.h"
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extern or_options_t options; /* command-line and config-file options */
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unsigned long stats_n_padding_cells_processed = 0;
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unsigned long stats_n_create_cells_processed = 0;
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unsigned long stats_n_created_cells_processed = 0;
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unsigned long stats_n_relay_cells_processed = 0;
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unsigned long stats_n_destroy_cells_processed = 0;
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static void command_process_create_cell(cell_t *cell, connection_t *conn);
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static void command_process_created_cell(cell_t *cell, connection_t *conn);
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static void command_process_relay_cell(cell_t *cell, connection_t *conn);
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static void command_process_destroy_cell(cell_t *cell, connection_t *conn);
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static void command_time_process_cell(cell_t *cell, connection_t *conn,
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int *num, int *time,
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void (*func)(cell_t *, connection_t *)) {
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struct timeval start, end;
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long time_passed;
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*num += 1;
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tor_gettimeofday(&start);
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(*func)(cell, conn);
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tor_gettimeofday(&end);
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time_passed = tv_udiff(&start, &end) ;
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if (time_passed > 5000) { /* more than 5ms */
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log_fn(LOG_INFO,"That call just took %ld ms.",time_passed/1000);
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}
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*time += time_passed;
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}
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void command_process_cell(cell_t *cell, connection_t *conn) {
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static int num_create=0, num_created=0, num_relay=0, num_destroy=0;
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static int create_time=0, created_time=0, relay_time=0, destroy_time=0;
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static time_t current_second = 0; /* from previous calls to time */
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time_t now = time(NULL);
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if(now > current_second) { /* the second has rolled over */
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/* print stats */
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log(LOG_INFO,"At end of second:");
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log(LOG_INFO,"Create: %d (%d ms)", num_create, create_time/1000);
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log(LOG_INFO,"Created: %d (%d ms)", num_created, created_time/1000);
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log(LOG_INFO,"Relay: %d (%d ms)", num_relay, relay_time/1000);
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log(LOG_INFO,"Destroy: %d (%d ms)", num_destroy, destroy_time/1000);
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/* zero out stats */
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num_create = num_created = num_relay = num_destroy = 0;
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create_time = created_time = relay_time = destroy_time = 0;
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/* remember which second it is, for next time */
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current_second = now;
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}
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switch(cell->command) {
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case CELL_PADDING:
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++stats_n_padding_cells_processed;
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/* do nothing */
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break;
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case CELL_CREATE:
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++stats_n_create_cells_processed;
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command_time_process_cell(cell, conn, &num_create, &create_time,
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command_process_create_cell);
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break;
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case CELL_CREATED:
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++stats_n_created_cells_processed;
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command_time_process_cell(cell, conn, &num_created, &created_time,
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command_process_created_cell);
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break;
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case CELL_RELAY:
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++stats_n_relay_cells_processed;
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command_time_process_cell(cell, conn, &num_relay, &relay_time,
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command_process_relay_cell);
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break;
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case CELL_DESTROY:
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++stats_n_destroy_cells_processed;
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command_time_process_cell(cell, conn, &num_destroy, &destroy_time,
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command_process_destroy_cell);
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break;
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default:
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log_fn(LOG_WARN,"Cell of unknown type (%d) received. Dropping.", cell->command);
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break;
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}
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}
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static void command_process_create_cell(cell_t *cell, connection_t *conn) {
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circuit_t *circ;
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circ = circuit_get_by_circ_id_conn(cell->circ_id, conn);
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if(circ) {
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log_fn(LOG_WARN,"received CREATE cell (circID %d) for known circ. Dropping.", cell->circ_id);
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return;
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}
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circ = circuit_new(cell->circ_id, conn);
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circ->state = CIRCUIT_STATE_ONIONSKIN_PENDING;
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if(cell->length != ONIONSKIN_CHALLENGE_LEN) {
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log_fn(LOG_WARN,"Bad cell length %d. Dropping.", cell->length);
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circuit_close(circ);
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return;
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}
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memcpy(circ->onionskin,cell->payload,cell->length);
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/* hand it off to the cpuworkers, and then return */
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if(assign_to_cpuworker(NULL, CPUWORKER_TASK_ONION, circ) < 0) {
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log_fn(LOG_WARN,"Failed to hand off onionskin. Closing.");
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circuit_close(circ);
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return;
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}
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log_fn(LOG_INFO,"success: handed off onionskin.");
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}
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static void command_process_created_cell(cell_t *cell, connection_t *conn) {
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circuit_t *circ;
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circ = circuit_get_by_circ_id_conn(cell->circ_id, conn);
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if(!circ) {
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log_fn(LOG_INFO,"(circID %d) unknown circ (probably got a destroy earlier). Dropping.", cell->circ_id);
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return;
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}
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if(circ->n_circ_id != cell->circ_id) {
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log_fn(LOG_WARN,"got created cell from OPward? Closing.");
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circuit_close(circ);
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return;
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}
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assert(cell->length == ONIONSKIN_REPLY_LEN);
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if(circ->cpath) { /* we're the OP. Handshake this. */
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log_fn(LOG_DEBUG,"at OP. Finishing handshake.");
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if(circuit_finish_handshake(circ, cell->payload) < 0) {
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log_fn(LOG_WARN,"circuit_finish_handshake failed.");
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circuit_close(circ);
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return;
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}
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log_fn(LOG_DEBUG,"Moving to next skin.");
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if(circuit_send_next_onion_skin(circ) < 0) {
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log_fn(LOG_INFO,"circuit_send_next_onion_skin failed.");
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circuit_close(circ); /* XXX push this circuit_close lower */
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return;
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}
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} else { /* pack it into an extended relay cell, and send it. */
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log_fn(LOG_INFO,"Converting created cell to extended relay cell, sending.");
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connection_edge_send_command(NULL, circ, RELAY_COMMAND_EXTENDED,
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cell->payload, cell->length, NULL);
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}
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}
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static void command_process_relay_cell(cell_t *cell, connection_t *conn) {
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circuit_t *circ;
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circ = circuit_get_by_circ_id_conn(cell->circ_id, conn);
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if(!circ) {
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log_fn(LOG_INFO,"unknown circuit %d. Dropping.", cell->circ_id);
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return;
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}
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if(circ->state == CIRCUIT_STATE_ONIONSKIN_PENDING) {
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log_fn(LOG_WARN,"circuit in create_wait. Closing.");
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circuit_close(circ);
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return;
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}
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if(cell->circ_id == circ->p_circ_id) { /* it's an outgoing cell */
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cell->circ_id = circ->n_circ_id; /* switch it */
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if(circuit_deliver_relay_cell(cell, circ, CELL_DIRECTION_OUT, conn->cpath_layer) < 0) {
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log_fn(LOG_WARN,"circuit_deliver_relay_cell (forward) failed. Closing.");
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circuit_close(circ);
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return;
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}
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} else { /* it's an ingoing cell */
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cell->circ_id = circ->p_circ_id; /* switch it */
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if(circuit_deliver_relay_cell(cell, circ, CELL_DIRECTION_IN, NULL) < 0) {
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log_fn(LOG_WARN,"circuit_deliver_relay_cell (backward) failed. Closing.");
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circuit_close(circ);
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return;
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}
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}
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}
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static void command_process_destroy_cell(cell_t *cell, connection_t *conn) {
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circuit_t *circ;
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circ = circuit_get_by_circ_id_conn(cell->circ_id, conn);
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if(!circ) {
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log_fn(LOG_INFO,"unknown circuit %d. Dropping.", cell->circ_id);
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return;
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}
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log_fn(LOG_DEBUG,"Received for circID %d.",cell->circ_id);
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if(circ->state == CIRCUIT_STATE_ONIONSKIN_PENDING) {
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onion_pending_remove(circ);
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}
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if(cell->circ_id == circ->p_circ_id || circ->cpath) {
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/* either the destroy came from behind, or we're the AP */
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circ->p_conn = NULL;
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circuit_close(circ);
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} else { /* the destroy came from ahead */
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circ->n_conn = NULL;
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log_fn(LOG_DEBUG, "Delivering 'truncated' back.");
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connection_edge_send_command(NULL, circ, RELAY_COMMAND_TRUNCATED,
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NULL, 0, NULL);
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}
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}
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/*
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Local Variables:
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mode:c
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indent-tabs-mode:nil
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c-basic-offset:2
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End:
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*/
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