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/* Copyright (c) 2001 Matej Pfajfar.
* 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 entry_connection_st.h
* @brief Entry connection structure.
**/
#ifndef ENTRY_CONNECTION_ST_H
#define ENTRY_CONNECTION_ST_H
#include "core/or/edge_connection_st.h"
/** Subtype of edge_connection_t for an "entry connection" -- that is, a SOCKS
* connection, a DNS request, a TransPort connection or a NATD connection */
struct entry_connection_t {
struct edge_connection_t edge_;
/** Nickname of planned exit node -- used with .exit support. */
/* XXX prop220: we need to make chosen_exit_name able to encode Ed IDs too.
* That's logically part of the UI parts for prop220 though. */
char *chosen_exit_name;
socks_request_t *socks_request; /**< SOCKS structure describing request (AP
* only.) */
/* === Isolation related, AP only. === */
entry_port_cfg_t entry_cfg;
/** AP only: The newnym epoch in which we created this connection. */
unsigned nym_epoch;
/** AP only: The original requested address before we rewrote it. */
char *original_dest_address;
/* Other fields to isolate on already exist. The ClientAddr is addr. The
ClientProtocol is a combination of type and socks_request->
socks_version. SocksAuth is socks_request->username/password.
DestAddr is in socks_request->address. */
/** Number of times we've reassigned this application connection to
* a new circuit. We keep track because the timeout is longer if we've
* already retried several times. */
uint8_t num_socks_retries;
/** For AP connections only: buffer for data that we have sent
* optimistically, which we might need to re-send if we have to
* retry this connection. */
struct buf_t *pending_optimistic_data;
/* For AP connections only: buffer for data that we previously sent
* optimistically which we are currently re-sending as we retry this
* connection. */
struct buf_t *sending_optimistic_data;
/** If this is a DNSPort connection, this field holds the pending DNS
* request that we're going to try to answer. */
struct evdns_server_request *dns_server_request;
#define DEBUGGING_17659
#ifdef DEBUGGING_17659
uint16_t marked_pending_circ_line;
const char *marked_pending_circ_file;
#endif
#define NUM_CIRCUITS_LAUNCHED_THRESHOLD 10
/** Number of times we've launched a circuit to handle this stream. If
* it gets too high, that could indicate an inconsistency between our
* "launch a circuit to handle this stream" logic and our "attach our
* stream to one of the available circuits" logic. */
unsigned int num_circuits_launched:4;
/** True iff this stream must attach to a one-hop circuit (e.g. for
* begin_dir). */
unsigned int want_onehop:1;
/** True iff this stream should use a BEGIN_DIR relay command to establish
* itself rather than BEGIN (either via onehop or via a whole circuit). */
unsigned int use_begindir:1;
/** For AP connections only. If 1, and we fail to reach the chosen exit,
* stop requiring it. */
unsigned int chosen_exit_optional:1;
/** For AP connections only. If non-zero, this exit node was picked as
* a result of the TrackHostExit, and the value decrements every time
* we fail to complete a circuit to our chosen exit -- if it reaches
* zero, abandon the associated mapaddress. */
unsigned int chosen_exit_retries:3;
/** True iff this is an AP connection that came from a transparent or
* NATd connection */
unsigned int is_transparent_ap:1;
/** For AP connections only: Set if this connection's target exit node
* allows optimistic data (that is, data sent on this stream before
* the exit has sent a CONNECTED cell) and we have chosen to use it.
*/
unsigned int may_use_optimistic_data : 1;
};
/** Cast a entry_connection_t subtype pointer to a edge_connection_t **/
#define ENTRY_TO_EDGE_CONN(c) (&(((c))->edge_))
#endif /* !defined(ENTRY_CONNECTION_ST_H) */
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