aboutsummaryrefslogtreecommitdiff
path: root/src/or/connection.h
blob: b0c2a42838ed0d3d0b22e118118e9ac4840c01f0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
/* Copyright (c) 2001 Matej Pfajfar.
 * Copyright (c) 2001-2004, Roger Dingledine.
 * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
 * Copyright (c) 2007-2012, 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);

dir_connection_t *dir_connection_new(int socket_family);
or_connection_t *or_connection_new(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);

void connection_link_connections(connection_t *conn_a, connection_t *conn_b);
void connection_free(connection_t *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);
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;                               \
    IF_HAS_BUFFEREVENT(tmp_conn_,                                         \
                       connection_start_writing(tmp_conn_));              \
  } 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);

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_fetch_from_buf(char *string, size_t len, connection_t *conn);
int connection_fetch_from_buf_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);

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_write_to_buf(const char *string, size_t len,
                                    connection_t *conn);
/* DOCDOC connection_write_to_buf_zlib */
static void connection_write_to_buf_zlib(const char *string, size_t len,
                                         dir_connection_t *conn, int done);
static INLINE void
connection_write_to_buf(const char *string, size_t len, connection_t *conn)
{
  connection_write_to_buf_impl_(string, len, conn, 0);
}
static INLINE void
connection_write_to_buf_zlib(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);
}

/* 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)
{
  IF_HAS_BUFFEREVENT(conn, {
    return evbuffer_get_length(bufferevent_get_input(conn->bufev));
  }) ELSE_IF_NO_BUFFEREVENT {
    return conn->inbuf ? buf_datalen(conn->inbuf) : 0;
  }
}

static INLINE size_t
connection_get_outbuf_len(connection_t *conn)
{
  IF_HAS_BUFFEREVENT(conn, {
    return evbuffer_get_length(bufferevent_get_output(conn->bufev));
  }) ELSE_IF_NO_BUFFEREVENT {
    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);
connection_t *connection_get_by_type_purpose(int type, int purpose);
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);
dir_connection_t *connection_dir_get_by_purpose_and_resource(
                                           int state, const char *resource);

#define connection_speaks_cells(conn) ((conn)->type == CONN_TYPE_OR)
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 remove_file_if_very_old(const char *fname, time_t now);

#ifdef USE_BUFFEREVENTS
int connection_type_uses_bufferevent(connection_t *conn);
void connection_configure_bufferevent_callbacks(connection_t *conn);
void connection_handle_read_cb(struct bufferevent *bufev, void *arg);
void connection_handle_write_cb(struct bufferevent *bufev, void *arg);
void connection_handle_event_cb(struct bufferevent *bufev, short event,
                                 void *arg);
void connection_get_rate_limit_totals(uint64_t *read_out,
                                      uint64_t *written_out);
void connection_enable_rate_limiting(connection_t *conn);
#else
#define connection_type_uses_bufferevent(c) (0)
#endif

#endif