Commit f1fc4ce2 authored by Roger Dingledine's avatar Roger Dingledine
Browse files

comment the functions in command.c

this is one of the files nick regarded as scary, so hopefully
these will help.


svn:r1817
parent 7ac29fa3
/* Copyright 2001,2002,2003 Roger Dingledine, Matej Pfajfar. */
/* Copyright 2001 Matej Pfajfar, 2001-2004 Roger Dingledine. */
/* See LICENSE for licensing information */
/* $Id$ */
......@@ -6,25 +6,28 @@
extern or_options_t options; /* command-line and config-file options */
/* keep statistics about how many of each type of cell we've received */
unsigned long stats_n_padding_cells_processed = 0;
unsigned long stats_n_create_cells_processed = 0;
unsigned long stats_n_created_cells_processed = 0;
unsigned long stats_n_relay_cells_processed = 0;
unsigned long stats_n_destroy_cells_processed = 0;
/* These are the main four functions for processing cells */
static void command_process_create_cell(cell_t *cell, connection_t *conn);
static void command_process_created_cell(cell_t *cell, connection_t *conn);
static void command_process_relay_cell(cell_t *cell, connection_t *conn);
static void command_process_destroy_cell(cell_t *cell, connection_t *conn);
static void command_time_process_cell(cell_t *cell, connection_t *conn,
int *num, int *time,
/* This is a wrapper function around the actual function that processes
* 'cell' that just arrived on 'conn'. Increment *time by the number of
* microseconds used by the call to *func(cell, conn).
*/
static void command_time_process_cell(cell_t *cell, connection_t *conn, int *time,
void (*func)(cell_t *, connection_t *)) {
struct timeval start, end;
long time_passed;
*num += 1;
tor_gettimeofday(&start);
(*func)(cell, conn);
......@@ -38,10 +41,19 @@ static void command_time_process_cell(cell_t *cell, connection_t *conn,
*time += time_passed;
}
/* Process a cell that was just received on conn. 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(cell_t *cell, connection_t *conn) {
/* 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 */
......@@ -67,22 +79,26 @@ void command_process_cell(cell_t *cell, connection_t *conn) {
break;
case CELL_CREATE:
++stats_n_create_cells_processed;
command_time_process_cell(cell, conn, &num_create, &create_time,
++num_create;
command_time_process_cell(cell, conn, &create_time,
command_process_create_cell);
break;
case CELL_CREATED:
++stats_n_created_cells_processed;
command_time_process_cell(cell, conn, &num_created, &created_time,
++num_created;
command_time_process_cell(cell, conn, &created_time,
command_process_created_cell);
break;
case CELL_RELAY:
++stats_n_relay_cells_processed;
command_time_process_cell(cell, conn, &num_relay, &relay_time,
++num_relay;
command_time_process_cell(cell, conn, &relay_time,
command_process_relay_cell);
break;
case CELL_DESTROY:
++stats_n_destroy_cells_processed;
command_time_process_cell(cell, conn, &num_destroy, &destroy_time,
++num_destroy;
command_time_process_cell(cell, conn, &destroy_time,
command_process_destroy_cell);
break;
default:
......@@ -91,6 +107,11 @@ void command_process_cell(cell_t *cell, connection_t *conn) {
}
}
/* Process a 'create' cell that just arrived from conn. 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, connection_t *conn) {
circuit_t *circ;
......@@ -116,6 +137,13 @@ static void command_process_create_cell(cell_t *cell, connection_t *conn) {
log_fn(LOG_DEBUG,"success: handed off onionskin.");
}
/* Process a 'created' cell that just arrived from conn. Find the circuit
* that it's intended for. If you're not the origin of the circuit, package
* the 'created' cell in an 'extended' relay cell and pass it back. If you
* 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, connection_t *conn) {
circuit_t *circ;
......@@ -152,6 +180,10 @@ static void command_process_created_cell(cell_t *cell, connection_t *conn) {
}
}
/* Process a 'relay' cell that just arrived from conn. 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, connection_t *conn) {
circuit_t *circ;
......@@ -184,6 +216,19 @@ static void command_process_relay_cell(cell_t *cell, connection_t *conn) {
}
}
/* Process a 'destroy' cell that just arrived from conn. 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, connection_t *conn) {
circuit_t *circ;
......
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