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Handle unavailable hidden services better. We try each intro point

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until none are left, then we try to refetch the descriptor. If it's
the same one we had before, then close streams right then. Whenever
a new stream arrives, even if it's right after, optimistically try
refetching the descriptor, just in case.


svn:r3379
This commit is contained in:
Roger Dingledine 2005-01-19 23:15:59 +00:00
parent ff48179372
commit 38be533c69
7 changed files with 45 additions and 35 deletions
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16
src/or/circuituse.c
View File

@ -817,18 +817,22 @@ circuit_get_open_circ_or_launch(connection_t *conn,
if (desired_circuit_purpose == CIRCUIT_PURPOSE_C_INTRODUCE_ACK_WAIT) {
/* need to pick an intro point */
try_an_intro_point:
exitname = rend_client_get_random_intro(conn->rend_query);
if (!exitname) {
log_fn(LOG_WARN,"Couldn't get an intro point for '%s'. Closing.",
log_fn(LOG_INFO,"No intro points for '%s': refetching service descriptor.",
conn->rend_query);
return -1;
rend_client_refetch_renddesc(conn->rend_query);
conn->state = AP_CONN_STATE_RENDDESC_WAIT;
return 0;
}
if (!router_get_by_nickname(exitname)) {
log_fn(LOG_WARN,"Advertised intro point '%s' is not known. Closing.", exitname);
log_fn(LOG_NOTICE,"Advertised intro point '%s' is not recognized for '%s'. Skipping over.",
exitname, conn->rend_query);
rend_client_remove_intro_point(exitname, conn->rend_query);
tor_free(exitname);
return -1;
goto try_an_intro_point;
}
/* XXX if we failed, then refetch the descriptor */
log_fn(LOG_INFO,"Chose %s as intro point for %s.", exitname, conn->rend_query);
}
@ -839,7 +843,7 @@ circuit_get_open_circ_or_launch(connection_t *conn,
if (conn->chosen_exit_name) {
exitname = tor_strdup(conn->chosen_exit_name);
if (!router_get_by_nickname(exitname)) {
log_fn(LOG_WARN,"Requested exit point '%s' is not known. Closing.", exitname);
log_fn(LOG_NOTICE,"Requested exit point '%s' is not known. Closing.", exitname);
tor_free(exitname);
return -1;
}

9
src/or/connection.c
View File

@ -219,7 +219,7 @@ void connection_about_to_close_connection(connection_t *conn)
connection_dir_connect_failed(conn);
}
if (conn->purpose == DIR_PURPOSE_FETCH_RENDDESC)
rend_client_desc_fetched(conn->rend_query, 0);
rend_client_desc_here(conn->rend_query); /* give it a try */
break;
case CONN_TYPE_OR:
/* Remember why we're closing this connection. */
@ -1243,9 +1243,11 @@ connection_t *connection_get_by_type_state_lastwritten(int type, int state) {
}
/** Return a connection of type <b>type</b> that has rendquery equal
* to <b>rendquery</b>, and that is not marked for close.
* to <b>rendquery</b>, and that is not marked for close. If state
* is non-zero, conn must be of that state too.
*/
connection_t *connection_get_by_type_rendquery(int type, const char *rendquery) {
connection_t *
connection_get_by_type_state_rendquery(int type, int state, const char *rendquery) {
int i, n;
connection_t *conn;
connection_t **carray;
@ -1255,6 +1257,7 @@ connection_t *connection_get_by_type_rendquery(int type, const char *rendquery)
conn = carray[i];
if (conn->type == type &&
!conn->marked_for_close &&
(!state || state == conn->state) &&
!rend_cmp_service_ids(rendquery, conn->rend_query))
return conn;
}

2
src/or/cpuworker.c
View File

@ -227,7 +227,7 @@ static int cpuworker_main(void *data) {
if (r == 0) {
log_fn(LOG_INFO,"CPU worker exiting because Tor process closed connection (either rotated keys or died).");
} else {
log_fn(LOG_INFO,"CPU worker editing because of error on connection To Tor process.");
log_fn(LOG_INFO,"CPU worker editing because of error on connection to Tor process.");
log_fn(LOG_INFO,"(Error on %d was %s)", fd, tor_socket_strerror(tor_socket_errno(fd)));
}
goto end;

2
src/or/directory.c
View File

@ -746,8 +746,8 @@ connection_dir_client_reached_eof(connection_t *conn)
* cleans it up */
} else {
/* success. notify pending connections about this. */
rend_client_desc_fetched(conn->rend_query, 1);
conn->purpose = DIR_PURPOSE_HAS_FETCHED_RENDDESC;
rend_client_desc_here(conn->rend_query);
}
break;
case 404:

4
src/or/or.h
View File

@ -1206,7 +1206,7 @@ connection_t *connection_get_by_identity_digest(const char *digest, int type);
connection_t *connection_get_by_type(int type);
connection_t *connection_get_by_type_state(int type, int state);
connection_t *connection_get_by_type_state_lastwritten(int type, int state);
connection_t *connection_get_by_type_rendquery(int type, const char *rendquery);
connection_t *connection_get_by_type_state_rendquery(int type, int state, const char *rendquery);
#define connection_speaks_cells(conn) ((conn)->type == CONN_TYPE_OR)
#define connection_has_pending_tls_data(conn) \
@ -1495,7 +1495,7 @@ void rend_client_refetch_renddesc(const char *query);
int rend_client_remove_intro_point(char *failed_intro, const char *query);
int rend_client_rendezvous_acked(circuit_t *circ, const char *request, size_t request_len);
int rend_client_receive_rendezvous(circuit_t *circ, const char *request, size_t request_len);
void rend_client_desc_fetched(char *query, int status);
void rend_client_desc_here(char *query);
char *rend_client_get_random_intro(char *query);

40
src/or/rendclient.c
View File

@ -239,7 +239,7 @@ rend_client_introduction_acked(circuit_t *circ,
void
rend_client_refetch_renddesc(const char *query)
{
if (connection_get_by_type_rendquery(CONN_TYPE_DIR, query)) {
if (connection_get_by_type_state_rendquery(CONN_TYPE_DIR, 0, query)) {
log_fn(LOG_INFO,"Would fetch a new renddesc here (for %s), but one is already in progress.", query);
} else {
/* not one already; initiate a dir rend desc lookup */
@ -258,6 +258,7 @@ rend_client_remove_intro_point(char *failed_intro, const char *query)
{
int i, r;
rend_cache_entry_t *ent;
connection_t *conn;
r = rend_cache_lookup_entry(query, &ent);
if (r<0) {
@ -282,6 +283,13 @@ rend_client_remove_intro_point(char *failed_intro, const char *query)
if (!ent->parsed->n_intro_points) {
log_fn(LOG_INFO,"No more intro points remain for %s. Re-fetching descriptor.", query);
rend_client_refetch_renddesc(query);
/* move all pending streams back to renddesc_wait */
while ((conn = connection_get_by_type_state_rendquery(CONN_TYPE_AP,
AP_CONN_STATE_CIRCUIT_WAIT, query))) {
conn->state = AP_CONN_STATE_RENDDESC_WAIT;
}
return 0;
}
log_fn(LOG_INFO,"%d options left for %s.", ent->parsed->n_intro_points, query);
@ -366,30 +374,21 @@ rend_client_receive_rendezvous(circuit_t *circ, const char *request, size_t requ
}
/** Find all the apconns in state AP_CONN_STATE_RENDDESC_WAIT that
* are waiting on query. If status==1, move them to the next state.
* If status==0, fail them.
* are waiting on query. If there's a working cache entry here
* with at least one intro point, move them to the next state;
* else fail them.
*/
void rend_client_desc_fetched(char *query, int status) {
connection_t **carray;
void rend_client_desc_here(char *query) {
connection_t *conn;
int n, i;
rend_cache_entry_t *entry;
get_connection_array(&carray, &n);
for (i = 0; i < n; ++i) {
conn = carray[i];
if (conn->type != CONN_TYPE_AP ||
conn->state != AP_CONN_STATE_RENDDESC_WAIT)
continue;
if (rend_cmp_service_ids(conn->rend_query, query))
continue;
/* great, this guy was waiting */
if (status!=0 ||
rend_cache_lookup_entry(conn->rend_query, &entry) == 1) {
while ((conn = connection_get_by_type_state_rendquery(CONN_TYPE_AP,
AP_CONN_STATE_RENDDESC_WAIT, query))) {
if (rend_cache_lookup_entry(conn->rend_query, &entry) == 1 &&
entry->parsed->n_intro_points > 0) {
/* either this fetch worked, or it failed but there was a
* valid entry from before which we should reuse */
log_fn(LOG_INFO,"Rend desc retrieved. Launching circuits.");
log_fn(LOG_INFO,"Rend desc is usable. Launching circuits.");
conn->state = AP_CONN_STATE_CIRCUIT_WAIT;
if (connection_ap_handshake_attach_circuit(conn) < 0) {
/* it will never work */
@ -397,8 +396,9 @@ void rend_client_desc_fetched(char *query, int status) {
conn->has_sent_end = 1;
connection_mark_for_close(conn);
}
tor_assert(conn->state != AP_CONN_STATE_RENDDESC_WAIT); /* avoid loop */
} else { /* 404, or fetch didn't get that far */
log_fn(LOG_NOTICE,"Failed to fetch service id '%s', and not in cache. Closing conn.", query);
log_fn(LOG_NOTICE,"Closing stream for '%s.onion': hidden service is unavailable (try again later).", query);
conn->has_sent_end = 1;
connection_mark_for_close(conn);
}

7
src/or/rendcommon.c
View File

@ -242,7 +242,9 @@ int rend_cache_lookup_desc(const char *query, const char **desc, size_t *desc_le
/** Parse *desc, calculate its service id, and store it in the cache.
* If we have a newer descriptor with the same ID, ignore this one.
* If we have an older descriptor with the same ID, replace it.
* Returns -1 if it's malformed or otherwise rejected, else return 0.
* Return -1 if it's malformed or otherwise rejected; return 0 if
* it's the same or older than one we've already got; return 1 if
* it's novel.
*/
int rend_cache_store(const char *desc, size_t desc_len)
{
@ -250,6 +252,7 @@ int rend_cache_store(const char *desc, size_t desc_len)
rend_service_descriptor_t *parsed;
char query[REND_SERVICE_ID_LEN+1];
time_t now;
tor_assert(rend_cache);
parsed = rend_parse_service_descriptor(desc,desc_len);
if (!parsed) {
@ -298,7 +301,7 @@ int rend_cache_store(const char *desc, size_t desc_len)
memcpy(e->desc, desc, desc_len);
log_fn(LOG_INFO,"Successfully stored rend desc '%s', len %d", query, (int)desc_len);
return 0;
return 1;
}
/** Called when we get a rendezvous-related relay cell on circuit