[tor-commits] [tor/master] Count intro circuit and not only established ones
nickm at torproject.org
nickm at torproject.org
Thu Jul 9 16:05:26 UTC 2015
commit 7657194d77fb5bec5b8e3ef2f4171f5ea54fb519
Author: David Goulet <dgoulet at ev0ke.net>
Date: Mon Jun 15 17:11:57 2015 -0400
Count intro circuit and not only established ones
When cleaning up extra circuits that we've opened for performance reason, we
need to count all the introduction circuit and not only the established ones
else we can end up with too many introduction points.
This also adds the check for expiring nodes when serving an INTRODUCE cell
since it's possible old clients are still using them before we have time to
close them.
Signed-off-by: David Goulet <dgoulet at ev0ke.net>
---
src/or/rendservice.c | 73 +++++++++++++++++++++++++++++++++++++++++---------
1 file changed, 60 insertions(+), 13 deletions(-)
diff --git a/src/or/rendservice.c b/src/or/rendservice.c
index a86245b..85f0fc7 100644
--- a/src/or/rendservice.c
+++ b/src/or/rendservice.c
@@ -31,9 +31,12 @@
#include "routerparse.h"
#include "routerset.h"
+struct rend_service_t;
static origin_circuit_t *find_intro_circuit(rend_intro_point_t *intro,
const char *pk_digest);
static rend_intro_point_t *find_intro_point(origin_circuit_t *circ);
+static rend_intro_point_t *find_expiring_intro_point(
+ struct rend_service_t *service, origin_circuit_t *circ);
static extend_info_t *find_rp_for_intro(
const rend_intro_cell_t *intro,
@@ -42,7 +45,6 @@ static extend_info_t *find_rp_for_intro(
static int intro_point_accepted_intro_count(rend_intro_point_t *intro);
static int intro_point_should_expire_now(rend_intro_point_t *intro,
time_t now);
-struct rend_service_t;
static int rend_service_derive_key_digests(struct rend_service_t *s);
static int rend_service_load_keys(struct rend_service_t *s);
static int rend_service_load_auth_keys(struct rend_service_t *s,
@@ -1503,12 +1505,15 @@ rend_service_introduce(origin_circuit_t *circuit, const uint8_t *request,
intro_point = find_intro_point(circuit);
if (intro_point == NULL) {
- log_warn(LD_BUG,
- "Internal error: Got an INTRODUCE2 cell on an "
- "intro circ (for service %s) with no corresponding "
- "rend_intro_point_t.",
- escaped(serviceid));
- goto err;
+ intro_point = find_expiring_intro_point(service, circuit);
+ if (intro_point == NULL) {
+ log_warn(LD_BUG,
+ "Internal error: Got an INTRODUCE2 cell on an "
+ "intro circ (for service %s) with no corresponding "
+ "rend_intro_point_t.",
+ escaped(serviceid));
+ goto err;
+ }
}
log_info(LD_REND, "Received INTRODUCE2 cell for service %s on circ %u.",
@@ -2688,8 +2693,8 @@ rend_service_launch_establish_intro(rend_service_t *service,
return 0;
}
-/** Return the number of introduction points that are or have been
- * established for the given service. */
+/** Return the number of introduction points that are established for the
+ * given service. */
static unsigned int
count_established_intro_points(const rend_service_t *service)
{
@@ -2701,6 +2706,30 @@ count_established_intro_points(const rend_service_t *service)
return num;
}
+/** Return the number of introduction points that are or are being
+ * established for the given service. This function iterates over all
+ * circuit and count those that are linked to the service and are waiting
+ * for the intro point to respond. */
+static unsigned int
+count_intro_point_circuits(const rend_service_t *service)
+{
+ unsigned int num_ipos = 0;
+ SMARTLIST_FOREACH_BEGIN(circuit_get_global_list(), circuit_t *, circ) {
+ if (!circ->marked_for_close &&
+ circ->state == CIRCUIT_STATE_OPEN &&
+ (circ->purpose == CIRCUIT_PURPOSE_S_ESTABLISH_INTRO ||
+ circ->purpose == CIRCUIT_PURPOSE_S_INTRO)) {
+ origin_circuit_t *oc = TO_ORIGIN_CIRCUIT(circ);
+ if (oc->rend_data &&
+ !rend_cmp_service_ids(service->service_id,
+ oc->rend_data->onion_address))
+ num_ipos++;
+ }
+ }
+ SMARTLIST_FOREACH_END(circ);
+ return num_ipos;
+}
+
/** Called when we're done building a circuit to an introduction point:
* sends a RELAY_ESTABLISH_INTRO cell.
*/
@@ -2739,7 +2768,8 @@ rend_service_intro_has_opened(origin_circuit_t *circuit)
* redefine this one as a general circuit or close it, depending.
* Substract the amount of expiring nodes here since the circuits are
* still opened. */
- if (count_established_intro_points(service) >
+ if ((count_intro_point_circuits(service) -
+ smartlist_len(service->expiring_nodes)) >
service->n_intro_points_wanted) {
const or_options_t *options = get_options();
/* Remove the intro point associated with this circuit, it's being
@@ -3053,6 +3083,23 @@ find_intro_circuit(rend_intro_point_t *intro, const char *pk_digest)
return NULL;
}
+/** Return the corresponding introdution point using the circuit <b>circ</b>
+ * found in the <b>service</b>. NULL is returned if not found. */
+static rend_intro_point_t *
+find_expiring_intro_point(rend_service_t *service, origin_circuit_t *circ)
+{
+ tor_assert(service);
+ tor_assert(TO_CIRCUIT(circ)->purpose == CIRCUIT_PURPOSE_S_ESTABLISH_INTRO ||
+ TO_CIRCUIT(circ)->purpose == CIRCUIT_PURPOSE_S_INTRO);
+
+ SMARTLIST_FOREACH(service->intro_nodes, rend_intro_point_t *, intro_point,
+ if (crypto_pk_eq_keys(intro_point->intro_key, circ->intro_key)) {
+ return intro_point;
+ });
+
+ return NULL;
+}
+
/** Return a pointer to the rend_intro_point_t corresponding to the
* service-side introduction circuit <b>circ</b>. */
static rend_intro_point_t *
@@ -3654,10 +3701,10 @@ rend_consider_services_upload(time_t now)
/* Does every introduction points have been established? */
unsigned int intro_points_ready =
count_established_intro_points(service) >= service->n_intro_points_wanted;
- if (service->next_upload_time < now ||
+ if (intro_points_ready &&
+ (service->next_upload_time < now ||
(service->desc_is_dirty &&
- service->desc_is_dirty < now-rendinitialpostdelay &&
- intro_points_ready)) {
+ service->desc_is_dirty < now-rendinitialpostdelay))) {
/* if it's time, or if the directory servers have a wrong service
* descriptor and ours has been stable for rendinitialpostdelay seconds,
* upload a new one of each format. */
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