Commit 5227395a authored by Nick Mathewson's avatar Nick Mathewson
Browse files

r6922@Kushana: nickm | 2006-07-26 16:32:24 -0400

 Rename some fields, compress a bitfield, and document some structs and fields


svn:r6919
parent dd779d99
......@@ -420,12 +420,12 @@ circuit_free_cpath_node(crypt_path_t *victim)
* of information about circuit <b>circ</b>.
*/
static void
circuit_dump_details(int severity, circuit_t *circ, int poll_index,
circuit_dump_details(int severity, circuit_t *circ, int conn_array_index,
const char *type, int this_circid, int other_circid)
{
log(severity, LD_CIRC, "Conn %d has %s circuit: circID %d (other side %d), "
"state %d (%s), born %d:",
poll_index, type, this_circid, other_circid, circ->state,
conn_array_index, type, this_circid, other_circid, circ->state,
circuit_state_to_string(circ->state), (int)circ->timestamp_created);
if (CIRCUIT_IS_ORIGIN(circ)) { /* circ starts at this node */
circuit_log_path(severity, LD_CIRC, TO_ORIGIN_CIRCUIT(circ));
......@@ -451,26 +451,26 @@ circuit_dump_by_conn(connection_t *conn, int severity)
if (! CIRCUIT_IS_ORIGIN(circ) && TO_OR_CIRCUIT(circ)->p_conn &&
TO_CONN(TO_OR_CIRCUIT(circ)->p_conn) == conn)
circuit_dump_details(severity, circ, conn->poll_index, "App-ward",
circuit_dump_details(severity, circ, conn->conn_array_index, "App-ward",
p_circ_id, n_circ_id);
if (CIRCUIT_IS_ORIGIN(circ)) {
for (tmpconn=TO_ORIGIN_CIRCUIT(circ)->p_streams; tmpconn;
tmpconn=tmpconn->next_stream) {
if (TO_CONN(tmpconn) == conn) {
circuit_dump_details(severity, circ, conn->poll_index, "App-ward",
p_circ_id, n_circ_id);
circuit_dump_details(severity, circ, conn->conn_array_index,
"App-ward", p_circ_id, n_circ_id);
}
}
}
if (circ->n_conn && TO_CONN(circ->n_conn) == conn)
circuit_dump_details(severity, circ, conn->poll_index, "Exit-ward",
circuit_dump_details(severity, circ, conn->conn_array_index, "Exit-ward",
n_circ_id, p_circ_id);
if (! CIRCUIT_IS_ORIGIN(circ)) {
for (tmpconn=TO_OR_CIRCUIT(circ)->n_streams; tmpconn;
tmpconn=tmpconn->next_stream) {
if (TO_CONN(tmpconn) == conn) {
circuit_dump_details(severity, circ, conn->poll_index, "Exit-ward",
n_circ_id, p_circ_id);
circuit_dump_details(severity, circ, conn->conn_array_index,
"Exit-ward", n_circ_id, p_circ_id);
}
}
}
......@@ -480,7 +480,7 @@ circuit_dump_by_conn(connection_t *conn, int severity)
conn->type == CONN_TYPE_OR &&
!memcmp(TO_OR_CONN(conn)->identity_digest, circ->n_conn_id_digest,
DIGEST_LEN)) {
circuit_dump_details(severity, circ, conn->poll_index,
circuit_dump_details(severity, circ, conn->conn_array_index,
(circ->state == CIRCUIT_STATE_OPEN &&
!CIRCUIT_IS_ORIGIN(circ)) ?
"Endpoint" : "Pending",
......
......@@ -982,13 +982,13 @@ circuit_get_open_circ_or_launch(edge_connection_t *conn,
if (desired_circuit_purpose == CIRCUIT_PURPOSE_C_GENERAL) {
if (conn->chosen_exit_name) {
routerinfo_t *r;
int opt = conn->chosen_exit_optional;
int opt = conn->_base.chosen_exit_optional;
if (!(r = router_get_by_nickname(conn->chosen_exit_name, 1))) {
log_fn(opt ? LOG_INFO : LOG_WARN, LD_APP,
"Requested exit point '%s' is not known. %s.",
conn->chosen_exit_name, opt ? "Trying others" : "Closing");
if (opt) {
conn->chosen_exit_optional = 0;
conn->_base.chosen_exit_optional = 0;
tor_free(conn->chosen_exit_name);
return 0;
}
......@@ -1173,13 +1173,13 @@ connection_ap_handshake_attach_circuit(edge_connection_t *conn)
if (conn->chosen_exit_name) {
routerinfo_t *router = router_get_by_nickname(conn->chosen_exit_name, 1);
int opt = conn->chosen_exit_optional;
int opt = conn->_base.chosen_exit_optional;
if (!router) {
log_fn(opt ? LOG_INFO : LOG_WARN, LD_APP,
"Requested exit point '%s' is not known. %s.",
conn->chosen_exit_name, opt ? "Trying others" : "Closing");
if (opt) {
conn->chosen_exit_optional = 0;
conn->_base.chosen_exit_optional = 0;
tor_free(conn->chosen_exit_name);
return 0;
}
......@@ -1190,7 +1190,7 @@ connection_ap_handshake_attach_circuit(edge_connection_t *conn)
"Requested exit point '%s' would refuse request. %s.",
conn->chosen_exit_name, opt ? "Trying others" : "Closing");
if (opt) {
conn->chosen_exit_optional = 0;
conn->_base.chosen_exit_optional = 0;
tor_free(conn->chosen_exit_name);
return 0;
}
......
......@@ -145,7 +145,7 @@ conn_state_to_string(int type, int state)
/** Allocate space for a new connection_t. This function just initializes
* conn; you must call connection_add() to link it into the main array.
*
* Set conn-\>type to <b>type</b>. Set conn-\>s and conn-\>poll_index to
* Set conn-\>type to <b>type</b>. Set conn-\>s and conn-\>conn_array_index to
* -1 to signify they are not yet assigned.
*
* If conn is not a listener type, allocate buffers for it. If it's
......@@ -191,7 +191,7 @@ connection_new(int type)
conn = tor_malloc_zero(length);
conn->magic = magic;
conn->s = -1; /* give it a default of 'not used' */
conn->poll_index = -1; /* also default to 'not used' */
conn->conn_array_index = -1; /* also default to 'not used' */
conn->global_identifier = n_connections_allocated++;
conn->type = type;
......@@ -2182,7 +2182,7 @@ assert_connection_ok(connection_t *conn, time_t now)
if (conn->hold_open_until_flushed)
tor_assert(conn->marked_for_close);
/* XXX check: wants_to_read, wants_to_write, s, poll_index,
/* XXX check: wants_to_read, wants_to_write, s, conn_array_index,
* marked_for_close. */
/* buffers */
......
......@@ -1139,7 +1139,7 @@ connection_ap_handshake_rewrite_and_attach(edge_connection_t *conn,
routers with this nickname */
conn->chosen_exit_name =
tor_strdup(hex_str(r->cache_info.identity_digest, DIGEST_LEN));
conn->chosen_exit_optional = 1;
conn->_base.chosen_exit_optional = 1;
}
}
......
......@@ -50,13 +50,12 @@ static time_t time_to_fetch_directory = 0;
/** When do we next download a running-routers summary? */
static time_t time_to_fetch_running_routers = 0;
/** Array of all open connections; each element corresponds to the element of
* poll_array in the same position. The first nfds elements are valid. */
/** Array of all open connections. The first n_conns elements are valid. */
static connection_t *connection_array[MAXCONNECTIONS+1] =
{ NULL };
static smartlist_t *closeable_connection_lst = NULL;
static int nfds=0; /**< Number of connections currently active. */
static int n_conns=0; /**< Number of connections currently active. */
/** We set this to 1 when we've opened a circuit, so we can print a log
* entry to inform the user that Tor is working. */
......@@ -121,8 +120,7 @@ static char* nt_strerror(uint32_t errnum);
/****************************************************************************
*
* This section contains accessors and other methods on the connection_array
* and poll_array variables (which are global within this file and unavailable
* outside it).
* variables (which are global within this file and unavailable outside it).
*
****************************************************************************/
......@@ -136,15 +134,15 @@ connection_add(connection_t *conn)
tor_assert(conn);
tor_assert(conn->s >= 0);
if (nfds >= get_options()->_ConnLimit-1) {
if (n_conns >= get_options()->_ConnLimit-1) {
log_warn(LD_NET,"Failing because we have %d connections already. Please "
"raise your ulimit -n.", nfds);
"raise your ulimit -n.", n_conns);
return -1;
}
tor_assert(conn->poll_index == -1); /* can only connection_add once */
conn->poll_index = nfds;
connection_array[nfds] = conn;
tor_assert(conn->conn_array_index == -1); /* can only connection_add once */
conn->conn_array_index = n_conns;
connection_array[n_conns] = conn;
conn->read_event = tor_malloc_zero(sizeof(struct event));
conn->write_event = tor_malloc_zero(sizeof(struct event));
......@@ -153,10 +151,10 @@ connection_add(connection_t *conn)
event_set(conn->write_event, conn->s, EV_WRITE|EV_PERSIST,
conn_write_callback, conn);
nfds++;
n_conns++;
log_debug(LD_NET,"new conn type %s, socket %d, nfds %d.",
conn_type_to_string(conn->type), conn->s, nfds);
log_debug(LD_NET,"new conn type %s, socket %d, n_conns %d.",
conn_type_to_string(conn->type), conn->s, n_conns);
return 0;
}
......@@ -171,24 +169,24 @@ connection_remove(connection_t *conn)
int current_index;
tor_assert(conn);
tor_assert(nfds>0);
tor_assert(n_conns>0);
log_debug(LD_NET,"removing socket %d (type %s), nfds now %d",
conn->s, conn_type_to_string(conn->type), nfds-1);
log_debug(LD_NET,"removing socket %d (type %s), n_conns now %d",
conn->s, conn_type_to_string(conn->type), n_conns-1);
tor_assert(conn->poll_index >= 0);
current_index = conn->poll_index;
if (current_index == nfds-1) { /* this is the end */
nfds--;
tor_assert(conn->conn_array_index >= 0);
current_index = conn->conn_array_index;
if (current_index == n_conns-1) { /* this is the end */
n_conns--;
return 0;
}
connection_unregister(conn);
/* replace this one with the one at the end */
nfds--;
connection_array[current_index] = connection_array[nfds];
connection_array[current_index]->poll_index = current_index;
n_conns--;
connection_array[current_index] = connection_array[n_conns];
connection_array[current_index]->conn_array_index = current_index;
return 0;
}
......@@ -243,7 +241,7 @@ int
connection_in_array(connection_t *conn)
{
int i;
for (i=0; i<nfds; ++i) {
for (i=0; i<n_conns; ++i) {
if (conn==connection_array[i])
return 1;
}
......@@ -258,7 +256,7 @@ void
get_connection_array(connection_t ***array, int *n)
{
*array = connection_array;
*n = nfds;
*n = n_conns;
}
/** Set the event mask on <b>conn</b> to <b>events</b>. (The event
......@@ -382,10 +380,10 @@ close_closeable_connections(void)
int i;
for (i = 0; i < smartlist_len(closeable_connection_lst); ) {
connection_t *conn = smartlist_get(closeable_connection_lst, i);
if (conn->poll_index < 0) {
if (conn->conn_array_index < 0) {
connection_unlink(conn, 0); /* blow it away right now */
} else {
if (!conn_close_if_marked(conn->poll_index))
if (!conn_close_if_marked(conn->conn_array_index))
++i;
}
}
......@@ -893,11 +891,11 @@ run_scheduled_events(time_t now)
circuit_build_needed_circs(now);
/** 5. We do housekeeping for each connection... */
for (i=0;i<nfds;i++) {
for (i=0;i<n_conns;i++) {
run_connection_housekeeping(i, now);
}
if (time_to_shrink_buffers < now) {
for (i=0;i<nfds;i++) {
for (i=0;i<n_conns;i++) {
connection_t *conn = connection_array[i];
if (conn->outbuf)
buf_shrink(conn->outbuf);
......@@ -1306,7 +1304,7 @@ dumpmemusage(int severity)
log(severity, LD_GENERAL,
"In buffers: "U64_FORMAT" used/"U64_FORMAT" allocated (%d conns).",
U64_PRINTF_ARG(buf_total_used), U64_PRINTF_ARG(buf_total_alloc),
nfds);
n_conns);
log(severity, LD_GENERAL, "In rephist: "U64_FORMAT" used by %d Tors.",
U64_PRINTF_ARG(rephist_total_alloc), rephist_total_num);
dump_routerlist_mem_usage(severity);
......@@ -1324,7 +1322,7 @@ dumpstats(int severity)
log(severity, LD_GENERAL, "Dumping stats:");
for (i=0;i<nfds;i++) {
for (i=0;i<n_conns;i++) {
conn = connection_array[i];
log(severity, LD_GENERAL,
"Conn %d (socket %d) type %d (%s), state %d (%s), created %d secs ago",
......
......@@ -600,8 +600,9 @@ typedef struct socks_request_t socks_request_t;
* conn->outbuf. Connections differ primarily in the functions called
* to fill and drain these buffers.
*/
struct connection_t {
uint32_t magic; /**< For memory debugging: must equal CONNECTION_MAGIC. */
typedef struct connection_t {
uint32_t magic; /**< For memory debugging: must equal one of
* *_CONNECTION_MAGIC. */
uint8_t type; /**< What kind of connection is this? */
uint8_t state; /**< Current state of this connection. */
......@@ -622,9 +623,12 @@ struct connection_t {
unsigned int control_events_are_extended:1;
/** Used for OR conns that shouldn't get any new circs attached to them. */
unsigned int or_is_obsolete:1;
/** For AP connections only. If 1, and we fail to reach the chosen exit,
* stop requiring it. */
unsigned int chosen_exit_optional:1;
int s; /**< Our socket; -1 if this connection is closed. */
int poll_index; /* XXXX rename. */
int conn_array_index; /**< Index into the global connection array. */
struct event *read_event; /**< Libevent event structure. */
struct event *write_event; /**< Libevent event structure. */
buf_t *inbuf; /**< Buffer holding data read over this connection. */
......@@ -657,12 +661,10 @@ struct connection_t {
/** Quasi-global identifier for this connection; used for control.c */
/* XXXX NM This can get re-used after 2**32 circuits. */
uint32_t global_identifier;
} connection_t;
};
typedef struct connection_t connection_t;
/** DOCDOC */
/** Subtype of connection_t for an "OR connection" -- that is, one that speaks
* cells over TLS. */
typedef struct or_connection_t {
connection_t _base;
......@@ -670,7 +672,7 @@ typedef struct or_connection_t {
* the other side's signing key. */
char *nickname; /**< Nickname of OR on other side (if any). */
tor_tls_t *tls; /**< TLS connection state (OR only.) */
tor_tls_t *tls; /**< TLS connection state */
/* bandwidth* and receiver_bucket only used by ORs in OPEN state: */
int bandwidthrate; /**< Bytes/s added to the bucket. (OPEN ORs only.) */
......@@ -687,21 +689,21 @@ typedef struct or_connection_t {
* identity digest as this one. */
uint16_t next_circ_id; /**< Which circ_id do we try to use next on
* this connection? This is always in the
* range 0..1<<15-1. (OR only.)*/
* range 0..1<<15-1. */
} or_connection_t;
/** Subtype of connection_t for an "edge connection" -- that is, a socks (ap)
* connection, or an exit. */
typedef struct edge_connection_t {
connection_t _base;
uint16_t stream_id;
struct edge_connection_t *next_stream; /**< Points to the next stream at this
* edge, if any (Edge only). */
* edge, if any */
struct crypt_path_t *cpath_layer; /**< A pointer to which node in the circ
* this conn exits at. (Edge only.) */
int package_window; /**< How many more relay cells can i send into the
* circuit? (Edge only.) */
int deliver_window; /**< How many more relay cells can end at me? (Edge
* only.) */
* this conn exits at. */
int package_window; /**< How many more relay cells can I send into the
* circuit? */
int deliver_window; /**< How many more relay cells can end at me? */
/** Number of times we've reassigned this application connection to
* a new circuit. We keep track because the timeout is longer if we've
......@@ -710,32 +712,34 @@ typedef struct edge_connection_t {
/** Nickname of planned exit node -- used with .exit support. */
char *chosen_exit_name;
/** If 1, and we fail to reach the chosen exit, stop requiring it. */
unsigned int chosen_exit_optional:1;
/* Used only by AP connections */
socks_request_t *socks_request; /**< SOCKS structure describing request (AP
* only.) */
struct circuit_t *on_circuit; /**< The circuit (if any) that this edge
* connection is using. */
uint32_t address_ttl; /**< TTL for address-to-addr mapping on exit
* connection. Exit connections only. */
/* Used only by DIR and AP connections: */
uint16_t stream_id; /**< The stream ID used for this edge connection on its
* circuit */
char rend_query[REND_SERVICE_ID_LEN+1]; /**< What rendezvous service are we
* querying for? (DIR/AP only) */
* querying for? (AP only) */
} edge_connection_t;
/** Subtype of connection_t for an "directory connection" -- that is, an HTTP
* connection to retrieve or serve directory material. */
typedef struct dir_connection_t {
connection_t _base;
/* Used only by Dir connections */
char *requested_resource; /**< Which 'resource' did we ask the directory
* for? */
unsigned int dirconn_direct:1; /**< Is this dirconn direct, or via Tor? */
/* Used only for server sides of some dir connections. */
/* Used only for server sides of some dir connections, to implement
* "spooling" of directory material to the outbuf. Otherwise, we'd have
* to append everything to the outbuf in one enormous chunk. */
enum {
DIR_SPOOL_NONE=0, DIR_SPOOL_SERVER_BY_DIGEST, DIR_SPOOL_SERVER_BY_FP,
DIR_SPOOL_CACHED_DIR, DIR_SPOOL_NETWORKSTATUS
......@@ -745,19 +749,19 @@ typedef struct dir_connection_t {
off_t cached_dir_offset;
tor_zlib_state_t *zlib_state;
/* Used only by DIR and AP connections: */
char rend_query[REND_SERVICE_ID_LEN+1]; /**< What rendezvous service are we
* querying for? (DIR/AP only) */
* querying for? */
char identity_digest[DIGEST_LEN]; /**< Hash of the public RSA key for
* the directory server's signing key. */
} dir_connection_t;
/** Subtype of connection_t for an connection to a controller. */
typedef struct control_connection_t {
connection_t _base;
/* Used only by control connections */
uint32_t event_mask;
uint32_t event_mask; /**< Bitfield: which events does this controller
* care about? */
uint32_t incoming_cmd_len;
uint32_t incoming_cmd_cur_len;
char *incoming_cmd;
......@@ -765,13 +769,23 @@ typedef struct control_connection_t {
uint16_t incoming_cmd_type;
} control_connection_t;
/** Cast a connection_t subtype pointer to a connection_t **/
#define TO_CONN(c) &(((c)->_base))
/** Helper macro: Given a pointer to to._base, of type from*, return &to. */
#define DOWNCAST(from, to, ptr) \
(to*) (((from*)(ptr)) - STRUCT_OFFSET(to, _base))
/** Convert a connection_t* to an or_connection_t*; assert if the cast is
* invalid. */
or_connection_t *TO_OR_CONN(connection_t *);
/** Convert a connection_t* to a dir_connection_t*; assert if the cast is
* invalid. */
dir_connection_t *TO_DIR_CONN(connection_t *);
/** Convert a connection_t* to an edge_connection_t*; assert if the cast is
* invalid. */
edge_connection_t *TO_EDGE_CONN(connection_t *);
/** Convert a connection_t* to an control_connection_t*; assert if the cast is
* invalid. */
control_connection_t *TO_CONTROL_CONN(connection_t *);
extern INLINE or_connection_t *TO_OR_CONN(connection_t *c)
......@@ -1115,13 +1129,14 @@ typedef uint16_t circid_t;
* OR connections multiplex many circuits at once, and stay standing even
* when there are no circuits running over them.
*
* A circuit_t structure fills two roles. First, a circuit_t links two
* connections together: either an edge connection and an OR connection,
* or two OR connections. (When joined to an OR connection, a circuit_t
* affects only cells sent to a particular circID on that connection. When
* joined to an edge connection, a circuit_t affects all data.)
* Second, a circuit_t holds the cipher keys and state for sending data
* A circuit_t structure cann fill one of two roles. First, a or_circuit_t
* links two connections together: either an edge connection and an OR
* connection, or two OR connections. (When joined to an OR connection, a
* circuit_t affects only cells sent to a particular circID on that
* connection. When joined to an edge connection, a circuit_t affects all
* data.)
* Second, an origin_circuit_t holds the cipher keys and state for sending data
* along a given circuit. At the OP, it has a sequence of ciphers, each
* of which is shared with a single OR along the circuit. Separate
* ciphers are used for data going "forward" (away from the OP) and
......@@ -1178,6 +1193,8 @@ typedef struct circuit_t {
struct circuit_t *next; /**< Next circuit in linked list. */
} circuit_t;
/** An origin_circuit_t holds data necessary to build and use a circuit.
*/
typedef struct origin_circuit_t {
circuit_t _base;
......@@ -1219,6 +1236,8 @@ typedef struct origin_circuit_t {
} origin_circuit_t;
/** An or_circuit_t holds information needed to implement a circuit at an
* OR. */
typedef struct or_circuit_t {
circuit_t _base;
......@@ -1258,23 +1277,30 @@ typedef struct or_circuit_t {
#endif
/** A hash of location-hidden service's PK if purpose is INTRO_POINT, or a
* rendezvous cookie if purpose is REND_POINT_WAITING or
* C_ESTABLISH_REND. Filled with zeroes otherwise.
* rendezvous cookie if purpose is REND_POINT_WAITING. Filled with zeroes
* otherwise.
*/
char rend_token[REND_TOKEN_LEN];
char handshake_digest[DIGEST_LEN]; /**< Stores KH for intermediate hops. */
} or_circuit_t;
/** Convert a circuit subtype to a circuit_t.*/
#define TO_CIRCUIT(x) (&((x)->_base))
or_circuit_t *TO_OR_CIRCUIT(circuit_t *x);
/** Convert a circuit_t* to a pointer to the enclosing or_circuit_t. Asserts
* if the cast is impossible. */
or_circuit_t *TO_OR_CIRCUIT(circuit_t *);
/** Convert a circuit_t* to a pointer to the enclosing origin_circuit_t.
* Asserts if the cast is impossible. */
origin_circuit_t *TO_ORIGIN_CIRCUIT(circuit_t *);
extern INLINE or_circuit_t *TO_OR_CIRCUIT(circuit_t *x)
{
tor_assert(x->magic == OR_CIRCUIT_MAGIC);
//return (or_circuit_t*) (((char*)x) - STRUCT_OFFSET(or_circuit_t, _base));
return DOWNCAST(circuit_t, or_circuit_t, x);
}
origin_circuit_t *TO_ORIGIN_CIRCUIT(circuit_t *x);
extern INLINE origin_circuit_t *TO_ORIGIN_CIRCUIT(circuit_t *x)
{
tor_assert(x->magic == ORIGIN_CIRCUIT_MAGIC);
......
......@@ -717,8 +717,9 @@ connection_edge_process_end_not_open(
/* rewrite it to an IP if we learned one. */
addressmap_rewrite(conn->socks_request->address,
sizeof(conn->socks_request->address));
if (conn->chosen_exit_optional) { /* stop wanting a specific exit */
conn->chosen_exit_optional = 0;
if (conn->_base.chosen_exit_optional) {
/* stop wanting a specific exit */
conn->_base.chosen_exit_optional = 0;
tor_free(conn->chosen_exit_name);
}
if (connection_ap_detach_retriable(conn, circ) >= 0)
......@@ -726,7 +727,7 @@ connection_edge_process_end_not_open(
/* else, conn will get closed below */
break;
case END_STREAM_REASON_CONNECTREFUSED:
if (!conn->chosen_exit_optional)
if (!conn->_base.chosen_exit_optional)
break; /* break means it'll close, below */
/* Else fall through: expire this circuit, clear the
* chosen_exit_name field, and try again. */
......@@ -740,8 +741,9 @@ connection_edge_process_end_not_open(
tor_assert(circ->_base.timestamp_dirty);
circ->_base.timestamp_dirty -= get_options()->MaxCircuitDirtiness;
if (conn->chosen_exit_optional) { /* stop wanting a specific exit */
conn->chosen_exit_optional = 0;
if (conn->_base.chosen_exit_optional) {
/* stop wanting a specific exit */
conn->_base.chosen_exit_optional = 0;
tor_free(conn->chosen_exit_name);
}
if (connection_ap_detach_retriable(conn, circ) >= 0)
......@@ -764,8 +766,9 @@ connection_edge_process_end_not_open(
exitrouter->exit_policy =
router_parse_addr_policy_from_string("reject *:*", -1);
}
if (conn->chosen_exit_optional) { /* stop wanting a specific exit */
conn->chosen_exit_optional = 0;
if (conn->_base.chosen_exit_optional) {
/* stop wanting a specific exit */
conn->_base.chosen_exit_optional = 0;
tor_free(conn->chosen_exit_name);
}
if (connection_ap_detach_retriable(conn, circ) >= 0)
......
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