mirror of
https://gitlab.torproject.org/tpo/core/tor.git
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228 lines
7.0 KiB
C
228 lines
7.0 KiB
C
/* Copyright 2001,2002 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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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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my_gettimeofday(&start);
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(*func)(cell, conn);
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my_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 long current_second = 0; /* from previous calls to gettimeofday */
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struct timeval now;
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my_gettimeofday(&now);
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if(now.tv_sec > 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.tv_sec;
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}
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switch(cell->command) {
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case CELL_PADDING:
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/* do nothing */
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break;
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case CELL_CREATE:
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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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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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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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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(LOG_DEBUG,"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_aci_conn(cell->aci, conn);
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if(circ) {
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log_fn(LOG_DEBUG,"received CREATE cell for known circ. Dropping.");
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return;
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}
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circ = circuit_new(cell->aci, conn);
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circ->state = CIRCUIT_STATE_ONIONSKIN_PENDING;
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if(cell->length != DH_ONIONSKIN_LEN) {
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log_fn(LOG_DEBUG,"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_DEBUG,"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_DEBUG,"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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cell_t newcell;
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circ = circuit_get_by_aci_conn(cell->aci, conn);
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if(!circ) {
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log_fn(LOG_DEBUG,"received CREATED cell for unknown circ. Dropping.");
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return;
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}
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if(circ->n_aci != cell->aci) {
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log_fn(LOG_DEBUG,"got created cell from OPward? Dropping.");
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return;
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}
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assert(cell->length == DH_KEY_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_INFO,"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);
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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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memset(&newcell, 0, sizeof(cell_t));
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newcell.command = CELL_RELAY;
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newcell.aci = circ->p_aci;
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SET_CELL_RELAY_COMMAND(newcell, RELAY_COMMAND_EXTENDED);
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SET_CELL_STREAM_ID(newcell, ZERO_STREAM);
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newcell.length = RELAY_HEADER_SIZE + cell->length;
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memcpy(newcell.payload+RELAY_HEADER_SIZE, cell->payload, DH_KEY_LEN);
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log_fn(LOG_DEBUG,"Sending extended relay cell.");
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if(circuit_deliver_relay_cell(&newcell, circ, CELL_DIRECTION_IN, NULL) < 0) {
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log_fn(LOG_DEBUG,"failed to deliver extended cell. 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_relay_cell(cell_t *cell, connection_t *conn) {
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circuit_t *circ;
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circ = circuit_get_by_aci_conn(cell->aci, conn);
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if(!circ) {
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log_fn(LOG_DEBUG,"unknown circuit %d. Dropping.", cell->aci);
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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_DEBUG,"circuit in create_wait. Dropping.");
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return;
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}
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if(cell->aci == circ->p_aci) { /* it's an outgoing cell */
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cell->aci = circ->n_aci; /* 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_INFO,"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->aci = circ->p_aci; /* 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_DEBUG,"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_aci_conn(cell->aci, conn);
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if(!circ) {
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log_fn(LOG_DEBUG,"unknown circuit %d. Dropping.", cell->aci);
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return;
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}
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log_fn(LOG_DEBUG,"Received for aci %d.",cell->aci);
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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->aci == circ->p_aci || 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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}
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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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