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another checkpoint toward letting ORs connect on demand

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svn:r1999
This commit is contained in:
Roger Dingledine 2004-07-02 23:08:59 +00:00
parent 62dcf9e20f
commit d58d4c0db6
1 changed files with 63 additions and 52 deletions
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115
src/or/circuitbuild.c
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@ -18,6 +18,8 @@ extern circuit_t *global_circuitlist;
/********* END VARIABLES ************/
static int
circuit_deliver_create_cell(circuit_t *circ, char *payload);
static cpath_build_state_t *
onion_new_cpath_build_state(uint8_t purpose, const char *exit_nickname);
static int
@ -282,12 +284,42 @@ void circuit_n_conn_done(connection_t *or_conn, int success) {
/* XXX could this be bad, eg if next_onion_skin failed because conn died? */
}
} else {
/* XXX008 pull the create cell out of circ->onionskin, and send it */
/* pull the create cell out of circ->onionskin, and send it */
if(circuit_deliver_create_cell(circ, circ->onionskin) < 0) {
circuit_mark_for_close(circ);
continue;
}
}
}
}
}
static int
circuit_deliver_create_cell(circuit_t *circ, char *payload) {
int circ_id_type;
cell_t cell;
tor_assert(circ && circ->n_conn && circ->n_conn->type == CONN_TYPE_OR);
tor_assert(payload);
circ_id_type = decide_circ_id_type(options.Nickname,
circ->n_conn->nickname);
circ->n_circ_id = get_unique_circ_id_by_conn(circ->n_conn, circ_id_type);
if(!circ->n_circ_id) {
log_fn(LOG_WARN,"failed to get unique circID.");
return -1;
}
log_fn(LOG_DEBUG,"Chosen circID %u.",circ->n_circ_id);
memset(&cell, 0, sizeof(cell_t));
cell.command = CELL_CREATE;
cell.circ_id = circ->n_circ_id;
memcpy(cell.payload, payload, ONIONSKIN_CHALLENGE_LEN);
connection_or_write_cell_to_buf(&cell, circ->n_conn);
return 0;
}
extern int has_completed_circuit;
/** This is the backbone function for building circuits.
@ -301,11 +333,9 @@ extern int has_completed_circuit;
* Return -1 if we want to tear down circ, else return 0.
*/
int circuit_send_next_onion_skin(circuit_t *circ) {
cell_t cell;
crypt_path_t *hop;
routerinfo_t *router;
int r;
int circ_id_type;
char payload[2+4+DIGEST_LEN+ONIONSKIN_CHALLENGE_LEN];
char *onionskin;
int payload_len;
@ -313,16 +343,7 @@ int circuit_send_next_onion_skin(circuit_t *circ) {
tor_assert(circ && CIRCUIT_IS_ORIGIN(circ));
if(circ->cpath->state == CPATH_STATE_CLOSED) {
tor_assert(circ->n_conn && circ->n_conn->type == CONN_TYPE_OR);
log_fn(LOG_DEBUG,"First skin; sending create cell.");
circ_id_type = decide_circ_id_type(options.Nickname,
circ->n_conn->nickname);
circ->n_circ_id = get_unique_circ_id_by_conn(circ->n_conn, circ_id_type);
memset(&cell, 0, sizeof(cell_t));
cell.command = CELL_CREATE;
cell.circ_id = circ->n_circ_id;
router = router_get_by_nickname(circ->n_conn->nickname);
if (!router) {
@ -333,12 +354,13 @@ int circuit_send_next_onion_skin(circuit_t *circ) {
if(onion_skin_create(router->onion_pkey,
&(circ->cpath->handshake_state),
cell.payload) < 0) {
payload) < 0) {
log_fn(LOG_WARN,"onion_skin_create (first hop) failed.");
return -1;
}
connection_or_write_cell_to_buf(&cell, circ->n_conn);
if(circuit_deliver_create_cell(circ, payload) < 0)
return -1;
circ->cpath->state = CPATH_STATE_AWAITING_KEYS;
circ->state = CIRCUIT_STATE_BUILDING;
@ -401,11 +423,10 @@ int circuit_send_next_onion_skin(circuit_t *circ) {
*/
int circuit_extend(cell_t *cell, circuit_t *circ) {
connection_t *n_conn;
int circ_id_type;
cell_t newcell;
relay_header_t rh;
int old_format;
char *onionskin;
char *id_digest=NULL;
if(circ->n_conn) {
log_fn(LOG_WARN,"n_conn already set. Bug/attack. Closing.");
@ -420,8 +441,7 @@ int circuit_extend(cell_t *cell, circuit_t *circ) {
old_format = 0;
} else {
log_fn(LOG_WARN, "Wrong length on extend cell. Closing circuit.");
circuit_mark_for_close(circ);
return 0;
return -1;
}
circ->n_addr = ntohl(get_uint32(cell->payload+RELAY_HEADER_SIZE));
@ -431,9 +451,8 @@ int circuit_extend(cell_t *cell, circuit_t *circ) {
n_conn = connection_twin_get_by_addr_port(circ->n_addr,circ->n_port);
onionskin = cell->payload+RELAY_HEADER_SIZE+4+2;
} else {
n_conn = connection_get_by_identity_digest(
cell->payload+RELAY_HEADER_SIZE+4+2,
CONN_TYPE_OR);
id_digest = cell->payload+RELAY_HEADER_SIZE+4+2;
n_conn = connection_get_by_identity_digest(id_digest, CONN_TYPE_OR);
onionskin = cell->payload+RELAY_HEADER_SIZE+4+2+DIGEST_LEN;
}
@ -451,24 +470,31 @@ int circuit_extend(cell_t *cell, circuit_t *circ) {
router = router_get_by_addr_port(circ->n_addr, circ->n_port);
if(!router) {
log_fn(LOG_INFO,"Next hop is an unknown router. Closing.");
circuit_mark_for_close(circ);
return 0;
return -1;
}
id_digest = router->identity_digest;
} else { /* new format */
router = router_get_by_digest(cell->payload+RELAY_HEADER_SIZE+4+2);
}
/* XXX copy onionskin into circ->onionskin, get into the right
* state, launch an or conn to the right place.
*...
*/
#if 0 /* if we do truncateds, no need to kill circ */
connection_edge_send_command(NULL, circ, RELAY_COMMAND_TRUNCATED,
NULL, 0, NULL);
return 0;
router = router_get_by_digest(id_digest);
#if 0
if(router) { /* addr/port might be different */
circ->n_addr = router->addr;
circ->n_port = router->or_port;
}
#endif
circuit_mark_for_close(circ);
}
tor_assert(id_digest);
memcpy(circ->onionskin, onionskin, ONIONSKIN_CHALLENGE_LEN);
circ->state = CIRCUIT_STATE_OR_WAIT;
n_conn = connection_or_connect(circ->n_addr, circ->n_port, id_digest);
if(!n_conn) {
log_fn(LOG_INFO,"Launching n_conn failed. Closing.");
return -1;
}
log_fn(LOG_DEBUG,"connecting in progress (or finished). Good.");
/* return success. The onion/circuit/etc will be taken care of automatically
* (may already have been) whenever n_conn reaches OR_CONN_STATE_OPEN.
*/
return 0;
}
@ -478,23 +504,8 @@ int circuit_extend(cell_t *cell, circuit_t *circ) {
circ->n_conn = n_conn;
log_fn(LOG_DEBUG,"n_conn is %s:%u",n_conn->address,n_conn->port);
circ_id_type = decide_circ_id_type(options.Nickname, n_conn->nickname);
// log_fn(LOG_DEBUG,"circ_id_type = %u.",circ_id_type);
circ->n_circ_id = get_unique_circ_id_by_conn(circ->n_conn, circ_id_type);
if(!circ->n_circ_id) {
log_fn(LOG_WARN,"failed to get unique circID.");
if(circuit_deliver_create_cell(circ, onionskin) < 0)
return -1;
}
log_fn(LOG_DEBUG,"Chosen circID %u.",circ->n_circ_id);
memset(&newcell, 0, sizeof(cell_t));
newcell.command = CELL_CREATE;
newcell.circ_id = circ->n_circ_id;
memcpy(newcell.payload, onionskin, ONIONSKIN_CHALLENGE_LEN);
connection_or_write_cell_to_buf(&newcell, circ->n_conn);
return 0;
}