/* Copyright (c) 2001 Matej Pfajfar.
* Copyright (c) 2001-2004, Roger Dingledine.
* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
* Copyright (c) 2007-2019, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/**
* \file connection.h
* \brief Header file for connection.c.
**/
#ifndef TOR_CONNECTION_H
#define TOR_CONNECTION_H
listener_connection_t *TO_LISTENER_CONN(connection_t *);
struct buf_t;
#define CONN_TYPE_MIN_ 3
/** Type for sockets listening for OR connections. */
#define CONN_TYPE_OR_LISTENER 3
/** A bidirectional TLS connection transmitting a sequence of cells.
* May be from an OR to an OR, or from an OP to an OR. */
#define CONN_TYPE_OR 4
/** A TCP connection from an onion router to a stream's destination. */
#define CONN_TYPE_EXIT 5
/** Type for sockets listening for SOCKS connections. */
#define CONN_TYPE_AP_LISTENER 6
/** A SOCKS proxy connection from the user application to the onion
* proxy. */
#define CONN_TYPE_AP 7
/** Type for sockets listening for HTTP connections to the directory server. */
#define CONN_TYPE_DIR_LISTENER 8
/** Type for HTTP connections to the directory server. */
#define CONN_TYPE_DIR 9
/* Type 10 is unused. */
/** Type for listening for connections from user interface process. */
#define CONN_TYPE_CONTROL_LISTENER 11
/** Type for connections from user interface process. */
#define CONN_TYPE_CONTROL 12
/** Type for sockets listening for transparent connections redirected by pf or
* netfilter. */
#define CONN_TYPE_AP_TRANS_LISTENER 13
/** Type for sockets listening for transparent connections redirected by
* natd. */
#define CONN_TYPE_AP_NATD_LISTENER 14
/** Type for sockets listening for DNS requests. */
#define CONN_TYPE_AP_DNS_LISTENER 15
/** Type for connections from the Extended ORPort. */
#define CONN_TYPE_EXT_OR 16
/** Type for sockets listening for Extended ORPort connections. */
#define CONN_TYPE_EXT_OR_LISTENER 17
/** Type for sockets listening for HTTP CONNECT tunnel connections. */
#define CONN_TYPE_AP_HTTP_CONNECT_LISTENER 18
#define CONN_TYPE_MAX_ 19
/* !!!! If _CONN_TYPE_MAX is ever over 31, we must grow the type field in
* connection_t. */
/* Proxy client handshake states */
/* We use a proxy but we haven't even connected to it yet. */
#define PROXY_INFANT 1
/* We use an HTTP proxy and we've sent the CONNECT command. */
#define PROXY_HTTPS_WANT_CONNECT_OK 2
/* We use a SOCKS4 proxy and we've sent the CONNECT command. */
#define PROXY_SOCKS4_WANT_CONNECT_OK 3
/* We use a SOCKS5 proxy and we try to negotiate without
any authentication . */
#define PROXY_SOCKS5_WANT_AUTH_METHOD_NONE 4
/* We use a SOCKS5 proxy and we try to negotiate with
Username/Password authentication . */
#define PROXY_SOCKS5_WANT_AUTH_METHOD_RFC1929 5
/* We use a SOCKS5 proxy and we just sent our credentials. */
#define PROXY_SOCKS5_WANT_AUTH_RFC1929_OK 6
/* We use a SOCKS5 proxy and we just sent our CONNECT command. */
#define PROXY_SOCKS5_WANT_CONNECT_OK 7
/* We use a proxy and we CONNECTed successfully!. */
#define PROXY_CONNECTED 8
/** State for any listener connection. */
#define LISTENER_STATE_READY 0
/**
* This struct associates an old listener connection to be replaced
* by new connection described by port configuration. Only used when
* moving listeners to/from wildcard IP address.
*/
typedef struct
{
connection_t *old_conn; /* Old listener connection to be replaced */
const port_cfg_t *new_port; /* New port configuration */
} listener_replacement_t;
const char *conn_type_to_string(int type);
const char *conn_state_to_string(int type, int state);
int conn_listener_type_supports_af_unix(int type);
dir_connection_t *dir_connection_new(int socket_family);
or_connection_t *or_connection_new(int type, int socket_family);
edge_connection_t *edge_connection_new(int type, int socket_family);
entry_connection_t *entry_connection_new(int type, int socket_family);
control_connection_t *control_connection_new(int socket_family);
listener_connection_t *listener_connection_new(int type, int socket_family);
connection_t *connection_new(int type, int socket_family);
int connection_init_accepted_conn(connection_t *conn,
const listener_connection_t *listener);
void connection_link_connections(connection_t *conn_a, connection_t *conn_b);
MOCK_DECL(void,connection_free_,(connection_t *conn));
#define connection_free(conn) \
FREE_AND_NULL(connection_t, connection_free_, (conn))
void connection_free_all(void);
void connection_about_to_close_connection(connection_t *conn);
void connection_close_immediate(connection_t *conn);
void connection_mark_for_close_(connection_t *conn,
int line, const char *file);
MOCK_DECL(void, connection_mark_for_close_internal_,
(connection_t *conn, int line, const char *file));
#define connection_mark_for_close(c) \
connection_mark_for_close_((c), __LINE__, SHORT_FILE__)
#define connection_mark_for_close_internal(c) \
connection_mark_for_close_internal_((c), __LINE__, SHORT_FILE__)
/**
* Mark 'c' for close, but try to hold it open until all the data is written.
* Use the _internal versions of connection_mark_for_close; this should be
* called when you either are sure that if this is an or_connection_t the
* controlling channel has been notified (e.g. with
* connection_or_notify_error()), or you actually are the
* connection_or_close_for_error() or connection_or_close_normally function.
* For all other cases, use connection_mark_and_flush() instead, which
* checks for or_connection_t properly, instead. See below.
*/
#define connection_mark_and_flush_internal_(c,line,file) \
do { \
connection_t *tmp_conn__ = (c); \
connection_mark_for_close_internal_(tmp_conn__, (line), (file)); \
tmp_conn__->hold_open_until_flushed = 1; \
} while (0)
#define connection_mark_and_flush_internal(c) \
connection_mark_and_flush_internal_((c), __LINE__, SHORT_FILE__)
/**
* Mark 'c' for close, but try to hold it open until all the data is written.
*/
#define connection_mark_and_flush_(c,line,file) \
do { \
connection_t *tmp_conn_ = (c); \
if (tmp_conn_->type == CONN_TYPE_OR) { \
log_warn(LD_CHANNEL | LD_BUG, \
"Something tried to close (and flush) an or_connection_t" \
" without going through channels at %s:%d", \
file, line); \
connection_or_close_for_error(TO_OR_CONN(tmp_conn_), 1); \
} else { \
connection_mark_and_flush_internal_(c, line, file); \
} \
} while (0)
#define connection_mark_and_flush(c) \
connection_mark_and_flush_((c), __LINE__, SHORT_FILE__)
void connection_expire_held_open(void);
int connection_connect(connection_t *conn, const char *address,
const tor_addr_t *addr,
uint16_t port, int *socket_error);
#ifdef HAVE_SYS_UN_H
int connection_connect_unix(connection_t *conn, const char *socket_path,
int *socket_error);
#endif /* defined(HAVE_SYS_UN_H) */
/** Maximum size of information that we can fit into SOCKS5 username
or password fields. */
#define MAX_SOCKS5_AUTH_FIELD_SIZE 255
/** Total maximum size of information that we can fit into SOCKS5
username and password fields. */
#define MAX_SOCKS5_AUTH_SIZE_TOTAL 2*MAX_SOCKS5_AUTH_FIELD_SIZE
int connection_proxy_connect(connection_t *conn, int type);
int connection_read_proxy_handshake(connection_t *conn);
void log_failed_proxy_connection(connection_t *conn);
int get_proxy_addrport(tor_addr_t *addr, uint16_t *port, int *proxy_type,
const connection_t *conn);
int retry_all_listeners(smartlist_t *new_conns,
int close_all_noncontrol);
void connection_mark_all_noncontrol_listeners(void);
void connection_mark_all_noncontrol_connections(void);
ssize_t connection_bucket_write_limit(connection_t *conn, time_t now);
int global_write_bucket_low(connection_t *conn, size_t attempt, int priority);
void connection_bucket_init(void);
void connection_bucket_adjust(const or_options_t *options);
void connection_bucket_refill_all(time_t now,
uint32_t now_ts);
void connection_read_bw_exhausted(connection_t *conn, bool is_global_bw);
void connection_write_bw_exhausted(connection_t *conn, bool is_global_bw);
void connection_consider_empty_read_buckets(connection_t *conn);
void connection_consider_empty_write_buckets(connection_t *conn);
int connection_handle_read(connection_t *conn);
int connection_buf_get_bytes(char *string, size_t len, connection_t *conn);
int connection_buf_get_line(connection_t *conn, char *data,
size_t *data_len);
int connection_fetch_from_buf_http(connection_t *conn,
char **headers_out, size_t max_headerlen,
char **body_out, size_t *body_used,
size_t max_bodylen, int force_complete);
int connection_wants_to_flush(connection_t *conn);
int connection_outbuf_too_full(connection_t *conn);
int connection_handle_write(connection_t *conn, int force);
int connection_flush(connection_t *conn);
MOCK_DECL(void, connection_write_to_buf_impl_,
(const char *string, size_t len, connection_t *conn, int zlib));
/* DOCDOC connection_write_to_buf */
static void connection_buf_add(const char *string, size_t len,
connection_t *conn);
static inline void
connection_buf_add(const char *string, size_t len, connection_t *conn)
{
connection_write_to_buf_impl_(string, len, conn, 0);
}
void connection_buf_add_compress(const char *string, size_t len,
dir_connection_t *conn, int done);
void connection_buf_add_buf(connection_t *conn, struct buf_t *buf);
size_t connection_get_inbuf_len(connection_t *conn);
size_t connection_get_outbuf_len(connection_t *conn);
connection_t *connection_get_by_global_id(uint64_t id);
connection_t *connection_get_by_type(int type);
MOCK_DECL(connection_t *,connection_get_by_type_nonlinked,(int type));
MOCK_DECL(connection_t *,connection_get_by_type_addr_port_purpose,(int type,
const tor_addr_t *addr,
uint16_t port, int purpose));
connection_t *connection_get_by_type_state(int type, int state);
connection_t *connection_get_by_type_state_rendquery(int type, int state,
const char *rendquery);
smartlist_t *connection_list_by_type_state(int type, int state);
smartlist_t *connection_list_by_type_purpose(int type, int purpose);
smartlist_t *connection_dir_list_by_purpose_and_resource(
int purpose,
const char *resource);
smartlist_t *connection_dir_list_by_purpose_resource_and_state(
int purpose,
const char *resource,
int state);
#define CONN_LEN_AND_FREE_TEMPLATE(sl) \
STMT_BEGIN \
int len = smartlist_len(sl); \
smartlist_free(sl); \
return len; \
STMT_END
/** Return a count of directory connections that are fetching the item
* described by purpose/resource. */
static inline int
connection_dir_count_by_purpose_and_resource(
int purpose,
const char *resource)
{
smartlist_t *conns = connection_dir_list_by_purpose_and_resource(
purpose,
resource);
CONN_LEN_AND_FREE_TEMPLATE(conns);
}
/** Return a count of directory connections that are fetching the item
* described by purpose/resource/state. */
static inline int
connection_dir_count_by_purpose_resource_and_state(
int purpose,
const char *resource,
int state)
{
smartlist_t *conns =
connection_dir_list_by_purpose_resource_and_state(
purpose,
resource,
state);
CONN_LEN_AND_FREE_TEMPLATE(conns);
}
#undef CONN_LEN_AND_FREE_TEMPLATE
int any_other_active_or_conns(const or_connection_t *this_conn);
/* || 0 is for -Wparentheses-equality (-Wall?) appeasement under clang */
#define connection_speaks_cells(conn) (((conn)->type == CONN_TYPE_OR) || 0)
int connection_is_listener(connection_t *conn);
int connection_state_is_open(connection_t *conn);
int connection_state_is_connecting(connection_t *conn);
char *alloc_http_authenticator(const char *authenticator);
void assert_connection_ok(connection_t *conn, time_t now);
int connection_or_nonopen_was_started_here(or_connection_t *conn);
void connection_dump_buffer_mem_stats(int severity);
MOCK_DECL(void, clock_skew_warning,
(const connection_t *conn, long apparent_skew, int trusted,
log_domain_mask_t domain, const char *received,
const char *source));
int connection_is_moribund(connection_t *conn);
void connection_check_oos(int n_socks, int failed);
/** Execute the statement stmt, which may log events concerning the
* connection conn. To prevent infinite loops, disable log messages
* being sent to controllers if conn is a control connection.
*
* Stmt must not contain any return or goto statements.
*/
#define CONN_LOG_PROTECT(conn, stmt) \
STMT_BEGIN \
int _log_conn_is_control; \
tor_assert(conn); \
_log_conn_is_control = (conn->type == CONN_TYPE_CONTROL); \
if (_log_conn_is_control) \
disable_control_logging(); \
STMT_BEGIN stmt; STMT_END; \
if (_log_conn_is_control) \
enable_control_logging(); \
STMT_END
#ifdef CONNECTION_PRIVATE
STATIC void connection_free_minimal(connection_t *conn);
/* Used only by connection.c and test*.c */
MOCK_DECL(STATIC int,connection_connect_sockaddr,
(connection_t *conn,
const struct sockaddr *sa,
socklen_t sa_len,
const struct sockaddr *bindaddr,
socklen_t bindaddr_len,
int *socket_error));
MOCK_DECL(STATIC void, kill_conn_list_for_oos, (smartlist_t *conns));
MOCK_DECL(STATIC smartlist_t *, pick_oos_victims, (int n));
#endif /* defined(CONNECTION_PRIVATE) */
#endif /* !defined(TOR_CONNECTION_H) */