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[tor-commits] [tor/master] Record intro point timeouts in rend_intro_point_t
commit eaed37d14c6e1dc93a392f62ef2e501f75e4878a
Author: Robert Ransom <rransom.8774@xxxxxxxxx>
Date: Sat Sep 17 03:19:29 2011 -0700
Record intro point timeouts in rend_intro_point_t
---
src/or/circuitlist.c | 19 +++++++++++--------
src/or/or.h | 7 +++++++
src/or/rendclient.c | 50 ++++++++++++++++++++++++++++++++++++++++----------
src/or/rendclient.h | 10 ++++++++--
4 files changed, 66 insertions(+), 20 deletions(-)
diff --git a/src/or/circuitlist.c b/src/or/circuitlist.c
index e9cc9eb..2fc645a 100644
--- a/src/or/circuitlist.c
+++ b/src/or/circuitlist.c
@@ -1119,9 +1119,8 @@ circuit_expire_all_dirty_circs(void)
* - If circ isn't open yet: call circuit_build_failed() if we're
* the origin, and in either case call circuit_rep_hist_note_result()
* to note stats.
- * - If purpose is C_INTRODUCE_ACK_WAIT, remove the intro point we
- * just tried from our list of intro points for that service
- * descriptor.
+ * - If purpose is C_INTRODUCE_ACK_WAIT, report the intro point
+ * failure we just had to the hidden service client module.
* - Send appropriate destroys and edge_destroys for conns and
* streams attached to circ.
* - If circ->rend_splice is set (we are the midpoint of a joined
@@ -1190,16 +1189,20 @@ _circuit_mark_for_close(circuit_t *circ, int reason, int line,
}
if (circ->purpose == CIRCUIT_PURPOSE_C_INTRODUCE_ACK_WAIT) {
origin_circuit_t *ocirc = TO_ORIGIN_CIRCUIT(circ);
+ int timed_out = (reason == END_STREAM_REASON_TIMEOUT);
tor_assert(circ->state == CIRCUIT_STATE_OPEN);
tor_assert(ocirc->build_state->chosen_exit);
tor_assert(ocirc->rend_data);
/* treat this like getting a nack from it */
- log_info(LD_REND, "Failed intro circ %s to %s (awaiting ack). "
- "Removing from descriptor.",
+ log_info(LD_REND, "Failed intro circ %s to %s (awaiting ack). %s",
safe_str_client(ocirc->rend_data->onion_address),
- safe_str_client(build_state_get_exit_nickname(ocirc->build_state)));
- rend_client_remove_intro_point(ocirc->build_state->chosen_exit,
- ocirc->rend_data);
+ safe_str_client(build_state_get_exit_nickname(ocirc->build_state)),
+ timed_out ? "Recording timeout." : "Removing from descriptor.");
+ rend_client_report_intro_point_failure(ocirc->build_state->chosen_exit,
+ ocirc->rend_data,
+ timed_out ?
+ INTRO_POINT_FAILURE_TIMEOUT :
+ INTRO_POINT_FAILURE_GENERIC);
}
if (circ->n_conn) {
circuit_clear_cell_queue(circ, circ->n_conn);
diff --git a/src/or/or.h b/src/or/or.h
index 31deb89..32d4b11 100644
--- a/src/or/or.h
+++ b/src/or/or.h
@@ -3463,6 +3463,13 @@ typedef struct rend_intro_point_t {
extend_info_t *extend_info; /**< Extend info of this introduction point. */
crypto_pk_env_t *intro_key; /**< Introduction key that replaces the service
* key, if this descriptor is V2. */
+
+ /** (Client side only) Flag indicating that a timeout has occurred
+ * after sending an INTRODUCE cell to this intro point. After a
+ * timeout, an intro point should not be tried again during the same
+ * hidden service connection attempt, but it may be tried again
+ * during a future connection attempt. */
+ unsigned int timed_out : 1;
} rend_intro_point_t;
/** Information used to connect to a hidden service. Used on both the
diff --git a/src/or/rendclient.c b/src/or/rendclient.c
index 773ac8d..013d544 100644
--- a/src/or/rendclient.c
+++ b/src/or/rendclient.c
@@ -366,8 +366,9 @@ rend_client_introduction_acked(origin_circuit_t *circ,
log_info(LD_REND, "Got nack for %s from %s...",
safe_str_client(circ->rend_data->onion_address),
safe_str_client(extend_info_describe(circ->build_state->chosen_exit)));
- if (rend_client_remove_intro_point(circ->build_state->chosen_exit,
- circ->rend_data) > 0) {
+ if (rend_client_report_intro_point_failure(circ->build_state->chosen_exit,
+ circ->rend_data,
+ INTRO_POINT_FAILURE_GENERIC)>0){
/* There are introduction points left. Re-extend the circuit to
* another intro point and try again. */
int result = rend_client_reextend_intro_circuit(circ);
@@ -648,16 +649,26 @@ rend_client_cancel_descriptor_fetches(void)
} SMARTLIST_FOREACH_END(conn);
}
-/** Remove failed_intro from ent. If ent now has no intro points, or
- * service is unrecognized, then launch a new renddesc fetch.
-
+/** Mark <b>failed_intro</b> as a failed introduction point for the
+ * hidden service specified by <b>rend_query</b>. If the HS now has no
+ * usable intro points, or we do not have an HS descriptor for it,
+ * then launch a new renddesc fetch.
+ *
+ * If <b>failure_type</b> is INTRO_POINT_FAILURE_GENERIC, remove the
+ * intro point from (our parsed copy of) the HS descriptor.
+ *
+ * If <b>failure_type</b> is INTRO_POINT_FAILURE_TIMEOUT, mark the
+ * intro point as 'timed out'; it will not be retried until the
+ * current hidden service connection attempt has ended or it has
+ * appeared in a newly fetched rendezvous descriptor.
*
- * Return -1 if error, 0 if no intro points remain or service
+ * Return -1 if error, 0 if no usable intro points remain or service
* unrecognized, 1 if recognized and some intro points remain.
*/
int
-rend_client_remove_intro_point(extend_info_t *failed_intro,
- const rend_data_t *rend_query)
+rend_client_report_intro_point_failure(extend_info_t *failed_intro,
+ const rend_data_t *rend_query,
+ unsigned int failure_type)
{
int i, r;
rend_cache_entry_t *ent;
@@ -680,8 +691,20 @@ rend_client_remove_intro_point(extend_info_t *failed_intro,
rend_intro_point_t *intro = smartlist_get(ent->parsed->intro_nodes, i);
if (tor_memeq(failed_intro->identity_digest,
intro->extend_info->identity_digest, DIGEST_LEN)) {
- rend_intro_point_free(intro);
- smartlist_del(ent->parsed->intro_nodes, i);
+ switch (failure_type) {
+ default:
+ log_warn(LD_BUG, "Unknown failure type %u. Removing intro point.",
+ failure_type);
+ tor_fragile_assert();
+ /* fall through */
+ case INTRO_POINT_FAILURE_GENERIC:
+ rend_intro_point_free(intro);
+ smartlist_del(ent->parsed->intro_nodes, i);
+ break;
+ case INTRO_POINT_FAILURE_TIMEOUT:
+ intro->timed_out = 1;
+ break;
+ }
break;
}
}
@@ -911,6 +934,13 @@ rend_client_get_random_intro_impl(const rend_cache_entry_t *entry,
usable_nodes = smartlist_create();
smartlist_add_all(usable_nodes, entry->parsed->intro_nodes);
+ /* Remove the intro points that have timed out during this HS
+ * connection attempt from our list of usable nodes. */
+ SMARTLIST_FOREACH(usable_nodes, rend_intro_point_t *, ip,
+ if (ip->timed_out) {
+ SMARTLIST_DEL_CURRENT(usable_nodes, ip);
+ });
+
again:
if (smartlist_len(usable_nodes) == 0) {
if (n_excluded && get_options()->StrictNodes && warnings) {
diff --git a/src/or/rendclient.h b/src/or/rendclient.h
index c6cf82b..3421e07 100644
--- a/src/or/rendclient.h
+++ b/src/or/rendclient.h
@@ -22,8 +22,14 @@ int rend_client_introduction_acked(origin_circuit_t *circ,
void rend_client_refetch_v2_renddesc(const rend_data_t *rend_query);
void rend_client_cancel_descriptor_fetches(void);
void rend_client_purge_last_hid_serv_requests(void);
-int rend_client_remove_intro_point(extend_info_t *failed_intro,
- const rend_data_t *rend_query);
+
+#define INTRO_POINT_FAILURE_GENERIC 0
+#define INTRO_POINT_FAILURE_TIMEOUT 1
+
+int rend_client_report_intro_point_failure(extend_info_t *failed_intro,
+ const rend_data_t *rend_query,
+ unsigned int failure_type);
+
int rend_client_rendezvous_acked(origin_circuit_t *circ,
const uint8_t *request,
size_t request_len);
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