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Record the number of INTRODUCE2 cells each intro point has received

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This commit is contained in:
Robert Ransom 2011-10-05 23:52:14 -07:00
parent 6b26999146
commit 6f035cb2b4
2 changed files with 50 additions and 0 deletions
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4
src/or/or.h
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@ -3481,6 +3481,10 @@ typedef struct rend_intro_point_t {
* circuit-build timeout. See also MAX_INTRO_POINT_REACHABILITY_FAILURES. */
unsigned int unreachable_count : 3;
/** (Service side only) The number of INTRODUCE2 cells this intro
* point's circuit has received. */
unsigned int introduction_count : 24;
/** (Service side only) The time at which this intro point was first
* published, or -1 if this intro point has not yet been
* published. */

46
src/or/rendservice.c
View File

@ -25,6 +25,7 @@
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);
/** Represents the mapping from a virtual port of a rendezvous service to
* a real port on some IP.
@ -899,6 +900,7 @@ rend_service_introduce(origin_circuit_t *circuit, const uint8_t *request,
char buf[RELAY_PAYLOAD_SIZE];
char keys[DIGEST_LEN+CPATH_KEY_MATERIAL_LEN]; /* Holds KH, Df, Db, Kf, Kb */
rend_service_t *service;
rend_intro_point_t *intro_point;
int r, i, v3_shift = 0;
size_t len, keylen;
crypto_dh_env_t *dh = NULL;
@ -971,6 +973,14 @@ rend_service_introduce(origin_circuit_t *circuit, const uint8_t *request,
return -1;
}
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));
return -1;
}
if (!service->accepted_intros)
service->accepted_intros = digestmap_new();
@ -993,6 +1003,13 @@ rend_service_introduce(origin_circuit_t *circuit, const uint8_t *request,
digestmap_set(service->accepted_intros, pkpart_digest, access_time);
}
/* Record that we've received another INTRODUCE2 cell through this
* intro point. */
++(intro_point->introduction_count);
if (intro_point->introduction_count == 0) {
--(intro_point->introduction_count);
}
/* Next N bytes is encrypted with service key */
note_crypto_pk_op(REND_SERVER);
r = crypto_pk_private_hybrid_decrypt(
@ -1647,6 +1664,35 @@ find_intro_circuit(rend_intro_point_t *intro, const char *pk_digest)
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 *
find_intro_point(origin_circuit_t *circ)
{
const char *serviceid;
rend_service_t *service = NULL;
tor_assert(TO_CIRCUIT(circ)->purpose == CIRCUIT_PURPOSE_S_ESTABLISH_INTRO ||
TO_CIRCUIT(circ)->purpose == CIRCUIT_PURPOSE_S_INTRO);
tor_assert(circ->rend_data);
serviceid = circ->rend_data->onion_address;
SMARTLIST_FOREACH(rend_service_list, rend_service_t *, s,
if (tor_memeq(s->service_id, serviceid, REND_SERVICE_ID_LEN_BASE32)) {
service = s;
break;
});
if (service == NULL) return NULL;
SMARTLIST_FOREACH(service->intro_nodes, rend_intro_point_t *, intro_point,
if (crypto_pk_cmp_keys(intro_point->intro_key, circ->intro_key) == 0) {
return intro_point;
});
return NULL;
}
/** Determine the responsible hidden service directories for the
* rend_encoded_v2_service_descriptor_t's in <b>descs</b> and upload them;
* <b>service_id</b> and <b>seconds_valid</b> are only passed for logging