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
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
|
/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @file http_connection.h
* @brief Apache connection library
*
* @defgroup APACHE_CORE_CONNECTION Connection Library
* @ingroup APACHE_CORE
* @{
*/
#ifndef APACHE_HTTP_CONNECTION_H
#define APACHE_HTTP_CONNECTION_H
#include "apr_network_io.h"
#include "apr_buckets.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* This is the protocol module driver. This calls all of the
* pre-connection and connection hooks for all protocol modules.
* @param c The connection on which the request is read
* @param csd The mechanism on which this connection is to be read.
* Most times this will be a socket, but it is up to the module
* that accepts the request to determine the exact type.
*/
AP_CORE_DECLARE(void) ap_process_connection(conn_rec *c, void *csd);
/**
* Shutdown the connection for writing.
* @param c The connection to shutdown
* @param flush Whether or not to flush pending data before
* @return APR_SUCCESS or the underlying error
*/
AP_CORE_DECLARE(apr_status_t) ap_shutdown_conn(conn_rec *c, int flush);
/**
* Flushes all remain data in the client send buffer
* @param c The connection to flush
* @remark calls ap_shutdown_conn(c, 1)
*/
AP_CORE_DECLARE(void) ap_flush_conn(conn_rec *c);
/**
* This function is responsible for the following cases:
* <pre>
* we now proceed to read from the client until we get EOF, or until
* MAX_SECS_TO_LINGER has passed. The reasons for doing this are
* documented in a draft:
*
* http://tools.ietf.org/html/draft-ietf-http-connection-00.txt
*
* in a nutshell -- if we don't make this effort we risk causing
* TCP RST packets to be sent which can tear down a connection before
* all the response data has been sent to the client.
* </pre>
* @param c The connection we are closing
*/
AP_DECLARE(void) ap_lingering_close(conn_rec *c);
AP_DECLARE(int) ap_prep_lingering_close(conn_rec *c);
AP_DECLARE(int) ap_start_lingering_close(conn_rec *c);
/* Hooks */
/**
* create_connection is a RUN_FIRST hook which allows modules to create
* connections. In general, you should not install filters with the
* create_connection hook. If you require vhost configuration information
* to make filter installation decisions, you must use the pre_connection
* or install_network_transport hook. This hook should close the connection
* if it encounters a fatal error condition.
*
* @param p The pool from which to allocate the connection record
* @param server The server record to create the connection too.
* @param csd The socket that has been accepted
* @param conn_id A unique identifier for this connection. The ID only
* needs to be unique at that time, not forever.
* @param sbh A handle to scoreboard information for this connection.
* @param alloc The bucket allocator to use for all bucket/brigade creations
* @return An allocated connection record or NULL.
*/
AP_DECLARE_HOOK(conn_rec *, create_connection,
(apr_pool_t *p, server_rec *server, apr_socket_t *csd,
long conn_id, void *sbh, apr_bucket_alloc_t *alloc))
/**
* This hook gives protocol modules an opportunity to set everything up
* before calling the protocol handler. All pre-connection hooks are
* run until one returns something other than ok or decline
* @param c The connection on which the request has been received.
* @param csd The mechanism on which this connection is to be read.
* Most times this will be a socket, but it is up to the module
* that accepts the request to determine the exact type.
* @return OK or DECLINED
*/
AP_DECLARE_HOOK(int,pre_connection,(conn_rec *c, void *csd))
/**
* This hook implements different protocols. After a connection has been
* established, the protocol module must read and serve the request. This
* function does that for each protocol module. The first protocol module
* to handle the request is the last module run.
* @param c The connection on which the request has been received.
* @return OK or DECLINED
*/
AP_DECLARE_HOOK(int,process_connection,(conn_rec *c))
/**
* This hook implements different protocols. Before a connection is closed,
* protocols might have to perform some housekeeping actions, such as
* sending one last goodbye packet. The connection is, unless some other
* error already happened before, still open and operational.
* All pre-close-connection hooks are run until one returns something
* other than ok or decline
* @param c The connection on which the request has been received.
* @return OK or DECLINED
*/
AP_DECLARE_HOOK(int,pre_close_connection,(conn_rec *c))
/**
* This is a wrapper around ap_run_pre_connection. In case that
* ap_run_pre_connection returns an error it marks the connection as
* aborted and ensures that the basic connection setup normally done
* by the core module is done in case it was not done so far.
* @param c The connection on which the request has been received.
* Same as for the pre_connection hook.
* @param csd The mechanism on which this connection is to be read.
* Most times this will be a socket, but it is up to the module
* that accepts the request to determine the exact type.
* Same as for the pre_connection hook.
* @return The result of ap_run_pre_connection
*/
AP_DECLARE(int) ap_pre_connection(conn_rec *c, void *csd);
/**
* create_secondary_connection is a RUN_FIRST hook which allows modules to create
* secondary connections. In general, you should not install filters with the
* create_secondary_connection hook. This hook should close the connection
* if it encounters a fatal error condition.
*
* @param p The pool for the secondary connection
* @param master The master connection this belongs to.
* @param alloc The bucket allocator to use for all bucket/brigade creations
* @return An allocated connection record or NULL.
*/
AP_DECLARE_HOOK(conn_rec *, create_secondary_connection,
(apr_pool_t *p, conn_rec *master, apr_bucket_alloc_t *alloc))
/**
* Create a new server/incoming or client/outgoing/proxy connection
* @param p The pool from which to allocate the connection record
* @param server The server record to create the connection too.
* @param csd The socket that has been accepted
* @param conn_id A unique identifier for this connection. The ID only
* needs to be unique at that time, not forever.
* @param sbh A handle to scoreboard information for this connection.
* @param alloc The bucket allocator to use for all bucket/brigade creations
* @param outgoing Whether it's an outgoing (client) connection
* @return An allocated connection record or NULL.
* @remark To allow for future flags, outgoing must be a boolean (0 or 1)
* for now, otherwise NULL is returned
*/
AP_DECLARE(conn_rec *) ap_create_connection(apr_pool_t *p,
server_rec *server,
apr_socket_t *csd,
long conn_id, void *sbh,
apr_bucket_alloc_t *alloc,
unsigned int outgoing);
/**
* Create a new secondary connection based on a master one.
* @param pool The pool for the secondary connection
* @param master The master connection this belongs to.
* @param alloc The bucket allocator to use for all bucket/brigade creations
* @return An allocated connection record or NULL.
*/
AP_DECLARE(conn_rec *) ap_create_secondary_connection(apr_pool_t *pool,
conn_rec *master,
apr_bucket_alloc_t *alloc);
/** End Of Connection (EOC) bucket */
AP_DECLARE_DATA extern const apr_bucket_type_t ap_bucket_type_eoc;
/**
* Determine if a bucket is an End Of Connection (EOC) bucket
* @param e The bucket to inspect
* @return true or false
*/
#define AP_BUCKET_IS_EOC(e) (e->type == &ap_bucket_type_eoc)
/**
* Make the bucket passed in an End Of Connection (EOC) bucket
* @param b The bucket to make into an EOC bucket
* @return The new bucket, or NULL if allocation failed
*/
AP_DECLARE(apr_bucket *) ap_bucket_eoc_make(apr_bucket *b);
/**
* Create a bucket referring to an End Of Connection (EOC). This indicates
* that the connection will be closed.
* @param list The freelist from which this bucket should be allocated
* @return The new bucket, or NULL if allocation failed
*/
AP_DECLARE(apr_bucket *) ap_bucket_eoc_create(apr_bucket_alloc_t *list);
#ifdef __cplusplus
}
#endif
#endif /* !APACHE_HTTP_CONNECTION_H */
/** @} */
|
