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/* Copyright (c) 2001-2004, Roger Dingledine.
* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
* Copyright (c) 2007-2020, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/**
* \file node_select.h
* \brief Header file for node_select.c
**/
#ifndef TOR_NODE_SELECT_H
#define TOR_NODE_SELECT_H
/** Flags to be passed to control router_choose_random_node() to indicate what
* kind of nodes to pick according to what algorithm. */
typedef enum router_crn_flags_t {
CRN_NEED_UPTIME = 1<<0,
CRN_NEED_CAPACITY = 1<<1,
CRN_NEED_GUARD = 1<<2,
/* XXXX not used, apparently. */
CRN_WEIGHT_AS_EXIT = 1<<5,
CRN_NEED_DESC = 1<<6,
/* On clients, only provide nodes that satisfy ClientPreferIPv6OR */
CRN_PREF_ADDR = 1<<7,
/* On clients, only provide nodes that we can connect to directly, based on
* our firewall rules */
CRN_DIRECT_CONN = 1<<8,
/* On clients, only provide nodes with HSRend >= 2 protocol version which
* is required for hidden service version >= 3. */
CRN_RENDEZVOUS_V3 = 1<<9,
} router_crn_flags_t;
/** Possible ways to weight routers when choosing one randomly. See
* routerlist_sl_choose_by_bandwidth() for more information.*/
typedef enum bandwidth_weight_rule_t {
NO_WEIGHTING, WEIGHT_FOR_EXIT, WEIGHT_FOR_MID, WEIGHT_FOR_GUARD,
WEIGHT_FOR_DIR
} bandwidth_weight_rule_t;
/* Flags for pick_directory_server() and pick_trusteddirserver(). */
/** Flag to indicate that we should not automatically be willing to use
* ourself to answer a directory request.
* Passed to router_pick_directory_server (et al).*/
#define PDS_ALLOW_SELF (1<<0)
/** Flag to indicate that if no servers seem to be up, we should mark all
* directory servers as up and try again.
* Passed to router_pick_directory_server (et al).*/
#define PDS_RETRY_IF_NO_SERVERS (1<<1)
/** Flag to indicate that we should not exclude directory servers that
* our ReachableAddress settings would exclude. This usually means that
* we're going to connect to the server over Tor, and so we don't need to
* worry about our firewall telling us we can't.
* Passed to router_pick_directory_server (et al).*/
#define PDS_IGNORE_FASCISTFIREWALL (1<<2)
/** Flag to indicate that we should not use any directory authority to which
* we have an existing directory connection for downloading server descriptors
* or extrainfo documents.
*
* Passed to router_pick_directory_server (et al)
*/
#define PDS_NO_EXISTING_SERVERDESC_FETCH (1<<3)
/** Flag to indicate that we should not use any directory authority to which
* we have an existing directory connection for downloading microdescs.
*
* Passed to router_pick_directory_server (et al)
*/
#define PDS_NO_EXISTING_MICRODESC_FETCH (1<<4)
const routerstatus_t *router_pick_directory_server(dirinfo_type_t type,
int flags);
int router_get_my_share_of_directory_requests(double *v3_share_out);
const node_t *node_sl_choose_by_bandwidth(const smartlist_t *sl,
bandwidth_weight_rule_t rule);
double frac_nodes_with_descriptors(const smartlist_t *sl,
bandwidth_weight_rule_t rule,
int for_direct_conn);
const node_t *router_choose_random_node(smartlist_t *excludedsmartlist,
struct routerset_t *excludedset,
router_crn_flags_t flags);
const routerstatus_t *router_pick_trusteddirserver(dirinfo_type_t type,
int flags);
const routerstatus_t *router_pick_fallback_dirserver(dirinfo_type_t type,
int flags);
#ifdef NODE_SELECT_PRIVATE
STATIC int choose_array_element_by_weight(const uint64_t *entries,
int n_entries);
STATIC void scale_array_elements_to_u64(uint64_t *entries_out,
const double *entries_in,
int n_entries,
uint64_t *total_out);
STATIC const routerstatus_t *router_pick_directory_server_impl(
dirinfo_type_t auth, int flags,
int *n_busy_out);
STATIC int router_is_already_dir_fetching(const tor_addr_port_t *ap,
int serverdesc, int microdesc);
#endif /* defined(NODE_SELECT_PRIVATE) */
#endif /* !defined(TOR_NODE_SELECT_H) */
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