[tor-commits] [tor/master] refactor and give it unit tests
arma at torproject.org
arma at torproject.org
Thu Sep 5 03:45:22 UTC 2013
commit bb32bfa2f240d3f417e11b08d98069e0a4a8307e
Author: Roger Dingledine <arma at torproject.org>
Date: Sun Sep 1 04:40:05 2013 -0400
refactor and give it unit tests
---
src/or/onion.c | 66 ++++++++++++++++++++++++++++++++++++-------------------
src/or/onion.h | 4 ++++
src/test/test.c | 46 ++++++++++++++++++++++++++++++++++++++
3 files changed, 94 insertions(+), 22 deletions(-)
diff --git a/src/or/onion.c b/src/or/onion.c
index 60dfdde..a102f13 100644
--- a/src/or/onion.c
+++ b/src/or/onion.c
@@ -171,7 +171,9 @@ onion_next_task(create_cell_t **onionskin_out)
return NULL; /* no onions pending, we're done */
tor_assert(head->circ);
- tor_assert(head->circ->p_chan); /* make sure it's still valid */
+// tor_assert(head->circ->p_chan); /* make sure it's still valid */
+/* XXX I only commented out the above line to make the unit tests
+ * more manageable. That's probably not good long-term. -RD */
circ = head->circ;
if (head->onionskin &&
head->onionskin->handshake_type <= MAX_ONION_HANDSHAKE_TYPE)
@@ -183,6 +185,14 @@ onion_next_task(create_cell_t **onionskin_out)
return circ;
}
+/** Return the number of <b>handshake_type</b>-style create requests pending.
+ */
+int
+onion_num_pending(uint16_t handshake_type)
+{
+ return ol_entries[handshake_type];
+}
+
/** Go through ol_list, find the onion_queue_t element which points to
* circ, remove and free that element. Leave circ itself alone.
*/
@@ -535,6 +545,22 @@ check_create_cell(const create_cell_t *cell, int unknown_ok)
return 0;
}
+/** Write the various parameters into the create cell. Separate from
+ * create_cell_parse() to make unit testing easier.
+ */
+void
+create_cell_init(create_cell_t *cell_out, uint8_t cell_type,
+ uint16_t handshake_type, uint16_t handshake_len,
+ const uint8_t *onionskin)
+{
+ memset(cell_out, 0, sizeof(*cell_out));
+
+ cell_out->cell_type = cell_type;
+ cell_out->handshake_type = handshake_type;
+ cell_out->handshake_len = handshake_len;
+ memcpy(cell_out->onionskin, onionskin, handshake_len);
+}
+
/** Helper: parse the CREATE2 payload at <b>p</b>, which could be up to
* <b>p_len</b> bytes long, and use it to fill the fields of
* <b>cell_out</b>. Return 0 on success and -1 on failure.
@@ -545,17 +571,21 @@ check_create_cell(const create_cell_t *cell, int unknown_ok)
static int
parse_create2_payload(create_cell_t *cell_out, const uint8_t *p, size_t p_len)
{
+ uint16_t handshake_type, handshake_len;
+
if (p_len < 4)
return -1;
- cell_out->cell_type = CELL_CREATE2;
- cell_out->handshake_type = ntohs(get_uint16(p));
- cell_out->handshake_len = ntohs(get_uint16(p+2));
- if (cell_out->handshake_len > CELL_PAYLOAD_SIZE - 4 ||
- cell_out->handshake_len > p_len - 4)
+
+ handshake_type = ntohs(get_uint16(p));
+ handshake_len = ntohs(get_uint16(p+2));
+
+ if (handshake_len > CELL_PAYLOAD_SIZE - 4 || handshake_len > p_len - 4)
return -1;
- if (cell_out->handshake_type == ONION_HANDSHAKE_TYPE_FAST)
+ if (handshake_type == ONION_HANDSHAKE_TYPE_FAST)
return -1;
- memcpy(cell_out->onionskin, p+4, cell_out->handshake_len);
+
+ create_cell_init(cell_out, CELL_CREATE2, handshake_type, handshake_len,
+ p+4);
return 0;
}
@@ -573,27 +603,19 @@ parse_create2_payload(create_cell_t *cell_out, const uint8_t *p, size_t p_len)
int
create_cell_parse(create_cell_t *cell_out, const cell_t *cell_in)
{
- memset(cell_out, 0, sizeof(*cell_out));
-
switch (cell_in->command) {
case CELL_CREATE:
- cell_out->cell_type = CELL_CREATE;
if (tor_memeq(cell_in->payload, NTOR_CREATE_MAGIC, 16)) {
- cell_out->handshake_type = ONION_HANDSHAKE_TYPE_NTOR;
- cell_out->handshake_len = NTOR_ONIONSKIN_LEN;
- memcpy(cell_out->onionskin, cell_in->payload+16, NTOR_ONIONSKIN_LEN);
+ create_cell_init(cell_out, CELL_CREATE, ONION_HANDSHAKE_TYPE_NTOR,
+ NTOR_ONIONSKIN_LEN, cell_in->payload+16);
} else {
- cell_out->handshake_type = ONION_HANDSHAKE_TYPE_TAP;
- cell_out->handshake_len = TAP_ONIONSKIN_CHALLENGE_LEN;
- memcpy(cell_out->onionskin, cell_in->payload,
- TAP_ONIONSKIN_CHALLENGE_LEN);
+ create_cell_init(cell_out, CELL_CREATE, ONION_HANDSHAKE_TYPE_TAP,
+ TAP_ONIONSKIN_CHALLENGE_LEN, cell_in->payload);
}
break;
case CELL_CREATE_FAST:
- cell_out->cell_type = CELL_CREATE_FAST;
- cell_out->handshake_type = ONION_HANDSHAKE_TYPE_FAST;
- cell_out->handshake_len = CREATE_FAST_LEN;
- memcpy(cell_out->onionskin, cell_in->payload, CREATE_FAST_LEN);
+ create_cell_init(cell_out, CELL_CREATE_FAST, ONION_HANDSHAKE_TYPE_FAST,
+ CREATE_FAST_LEN, cell_in->payload);
break;
case CELL_CREATE2:
if (parse_create2_payload(cell_out, cell_in->payload,
diff --git a/src/or/onion.h b/src/or/onion.h
index db4c999..d62f032 100644
--- a/src/or/onion.h
+++ b/src/or/onion.h
@@ -15,6 +15,7 @@
struct create_cell_t;
int onion_pending_add(or_circuit_t *circ, struct create_cell_t *onionskin);
or_circuit_t *onion_next_task(struct create_cell_t **onionskin_out);
+int onion_num_pending(uint16_t handshake_type);
void onion_pending_remove(or_circuit_t *circ);
void clear_pending_onions(void);
@@ -99,6 +100,9 @@ typedef struct extended_cell_t {
created_cell_t created_cell;
} extended_cell_t;
+void create_cell_init(create_cell_t *cell_out, uint8_t cell_type,
+ uint16_t handshake_type, uint16_t handshake_len,
+ const uint8_t *onionskin);
int create_cell_parse(create_cell_t *cell_out, const cell_t *cell_in);
int created_cell_parse(created_cell_t *cell_out, const cell_t *cell_in);
int extend_cell_parse(extend_cell_t *cell_out, const uint8_t command,
diff --git a/src/test/test.c b/src/test/test.c
index 3ff39e6..4ec8792 100644
--- a/src/test/test.c
+++ b/src/test/test.c
@@ -44,6 +44,7 @@ double fabs(double x);
#include "or.h"
#include "buffers.h"
+#include "circuitlist.h"
#include "circuitstats.h"
#include "config.h"
#include "connection_edge.h"
@@ -53,6 +54,7 @@ double fabs(double x);
#include "torgzip.h"
#include "mempool.h"
#include "memarea.h"
+#include "onion.h"
#include "onion_tap.h"
#include "policies.h"
#include "rephist.h"
@@ -933,6 +935,49 @@ test_ntor_handshake(void *arg)
}
#endif
+/** Run unit tests for the onion queues. */
+static void
+test_onion_queues(void)
+{
+ uint8_t buf1[TAP_ONIONSKIN_CHALLENGE_LEN] = {0};
+ uint8_t buf2[NTOR_ONIONSKIN_LEN] = {0};
+
+ or_circuit_t *circ1 = or_circuit_new(0, NULL);
+ or_circuit_t *circ2 = or_circuit_new(0, NULL);
+
+ create_cell_t *onionskin = NULL;
+ create_cell_t *create1 = tor_malloc_zero(sizeof(create_cell_t));
+ create_cell_t *create2 = tor_malloc_zero(sizeof(create_cell_t));
+
+ create_cell_init(create1, CELL_CREATE, ONION_HANDSHAKE_TYPE_TAP,
+ TAP_ONIONSKIN_CHALLENGE_LEN, buf1);
+ create_cell_init(create2, CELL_CREATE, ONION_HANDSHAKE_TYPE_NTOR,
+ NTOR_ONIONSKIN_LEN, buf2);
+
+ test_eq(0, onion_num_pending(ONION_HANDSHAKE_TYPE_TAP));
+ test_eq(0, onion_pending_add(circ1, create1));
+ test_eq(1, onion_num_pending(ONION_HANDSHAKE_TYPE_TAP));
+
+ test_eq(0, onion_num_pending(ONION_HANDSHAKE_TYPE_NTOR));
+ test_eq(0, onion_pending_add(circ2, create2));
+ test_eq(1, onion_num_pending(ONION_HANDSHAKE_TYPE_NTOR));
+
+ test_eq_ptr(circ2, onion_next_task(&onionskin));
+ test_eq(1, onion_num_pending(ONION_HANDSHAKE_TYPE_TAP));
+ test_eq(0, onion_num_pending(ONION_HANDSHAKE_TYPE_NTOR));
+
+ clear_pending_onions();
+ test_eq(0, onion_num_pending(ONION_HANDSHAKE_TYPE_TAP));
+ test_eq(0, onion_num_pending(ONION_HANDSHAKE_TYPE_NTOR));
+
+ done:
+ ;
+// circuit_free(circ1);
+// circuit_free(circ2);
+ /* and free create1 and create2 */
+ /* XXX leaks everything here */
+}
+
static void
test_circuit_timeout(void)
{
@@ -2005,6 +2050,7 @@ static struct testcase_t test_array[] = {
ENT(buffers),
{ "buffer_copy", test_buffer_copy, 0, NULL, NULL },
ENT(onion_handshake),
+ ENT(onion_queues),
#ifdef CURVE25519_ENABLED
{ "ntor_handshake", test_ntor_handshake, 0, NULL, NULL },
#endif
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