/* Copyright (c) 2001 Matej Pfajfar.
* Copyright (c) 2001-2004, Roger Dingledine.
* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
* Copyright (c) 2007-2017, 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
/* XXXX For buf_datalen in inline function */
#include "buffers.h"
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 *replaced_conns,
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_refill(int seconds_elapsed, time_t now);
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);
/* DOCDOC connection_write_to_buf_compress */
static void connection_buf_add_compress(const char *string, size_t len,
dir_connection_t *conn, int done);
static inline void
connection_buf_add(const char *string, size_t len, connection_t *conn)
{
connection_write_to_buf_impl_(string, len, conn, 0);
}
static inline void
connection_buf_add_compress(const char *string, size_t len,
dir_connection_t *conn, int done)
{
connection_write_to_buf_impl_(string, len, TO_CONN(conn), done ? -1 : 1);
}
void connection_buf_add_buf(connection_t *conn, buf_t *buf);
/* DOCDOC connection_get_inbuf_len */
static size_t connection_get_inbuf_len(connection_t *conn);
/* DOCDOC connection_get_outbuf_len */
static size_t connection_get_outbuf_len(connection_t *conn);
static inline size_t
connection_get_inbuf_len(connection_t *conn)
{
return conn->inbuf ? buf_datalen(conn->inbuf) : 0;
}
static inline size_t
connection_get_outbuf_len(connection_t *conn)
{
return conn->outbuf ? buf_datalen(conn->outbuf) : 0;
}
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_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);
void clock_skew_warning(const connection_t *conn, long apparent_skew,
int trusted, log_domain_mask_t domain,
const char *received, const char *source);
/** Check if a connection is on the way out so the OOS handler doesn't try
* to kill more than it needs. */
static inline int
connection_is_moribund(connection_t *conn)
{
if (conn != NULL &&
(conn->conn_array_index < 0 ||
conn->marked_for_close)) {
return 1;
} else {
return 0;
}
}
void connection_check_oos(int n_socks, int failed);
#ifdef CONNECTION_PRIVATE
STATIC void connection_free_minimal(connection_t *conn);
/* Used only by connection.c and test*.c */
uint32_t bucket_millis_empty(int tokens_before, uint32_t last_empty_time,
int tokens_after, int milliseconds_elapsed,
const struct timeval *tvnow);
void connection_buckets_note_empty_ts(uint32_t *timestamp_var,
int tokens_before,
size_t tokens_removed,
const struct timeval *tvnow);
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) */