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
|
/*
This file is part of libmicrospdy
Copyright (C) 2013 Andrey Uzunov
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file io.h
* @brief Signatures for IO functions.
* @author Andrey Uzunov
*/
#ifndef IO_H
#define IO_H
#include "platform.h"
#include "io_openssl.h"
#include "io_raw.h"
/**
* Used for return code when reading and writing to the TLS socket.
*/
enum SPDY_IO_ERROR
{
/**
* The connection was closed by the other party.
*/
SPDY_IO_ERROR_CLOSED = 0,
/**
* Any kind of error ocurred. The session has to be closed.
*/
SPDY_IO_ERROR_ERROR = -2,
/**
* The function had to return without processing any data. The whole
* cycle of events has to be called again (SPDY_run) as something
* either has to be written or read or the the syscall was
* interrupted by a signal.
*/
SPDY_IO_ERROR_AGAIN = -3,
};
/**
* Global initializing. Must be called only once in the program.
*
*/
typedef void
(*SPDYF_IOGlobalInit) ();
/**
* Global deinitializing for the whole program. Should be called
* at the end of the program.
*
*/
typedef void
(*SPDYF_IOGlobalDeinit) ();
/**
* Initializing of io context for a specific daemon.
* Must be called when the daemon starts.
*
* @param daemon SPDY_Daemon for which io will be used. Daemon's
* certificate and key file are used for tls.
* @return SPDY_YES on success or SPDY_NO on error
*/
typedef int
(*SPDYF_IOInit) (struct SPDY_Daemon *daemon);
/**
* Deinitializing io context for a daemon. Should be called
* when the deamon is stopped.
*
* @param daemon SPDY_Daemon which is being stopped
*/
typedef void
(*SPDYF_IODeinit) (struct SPDY_Daemon *daemon);
/**
* Initializing io for a specific connection. Must be called
* after the connection has been accepted.
*
* @param session SPDY_Session whose socket will be used
* @return SPDY_NO if some funcs inside fail. SPDY_YES otherwise
*/
typedef int
(*SPDYF_IONewSession) (struct SPDY_Session *session);
/**
* Deinitializing io for a specific connection. Should be called
* closing session's socket.
*
* @param session SPDY_Session whose socket is used
*/
typedef void
(*SPDYF_IOCloseSession) (struct SPDY_Session *session);
/**
* Reading from session's socket. Reads available data and put it to the
* buffer.
*
* @param session for which data is received
* @param buffer where data from the socket will be written to
* @param size of the buffer
* @return number of bytes (at most size) read from the connection
* 0 if the other party has closed the connection
* SPDY_IO_ERROR code on error
*/
typedef int
(*SPDYF_IORecv) (struct SPDY_Session *session,
void * buffer,
size_t size);
/**
* Writing to session's socket. Writes the data given into the buffer to the
* socket.
*
* @param session whose context is used
* @param buffer from where data will be written to the socket
* @param size number of bytes to be taken from the buffer
* @return number of bytes (at most size) from the buffer that has been
* written to the connection
* 0 if the other party has closed the connection
* SPDY_IO_ERROR code on error
*/
typedef int
(*SPDYF_IOSend) (struct SPDY_Session *session,
const void * buffer,
size_t size);
/**
* Checks if there is data staying in the buffers of the underlying
* system that waits to be read. In case of TLS, this will call
* something like SSL_pending().
*
* @param session which is checked
* @return SPDY_YES if data is pending or SPDY_NO otherwise
*/
typedef int
(*SPDYF_IOIsPending) (struct SPDY_Session *session);
/**
* Called just before frames are about to be processed and written
* to the socket.
*
* @param session
* @return SPDY_NO if writing must not happen in the call;
* SPDY_YES otherwise
*/
typedef int
(*SPDYF_IOBeforeWrite) (struct SPDY_Session *session);
/**
* Called just after frames have been processed and written
* to the socket.
*
* @param session
* @param was_written has the same value as the write function for the
* session will return
* @return returned value will be used by the write function to return
*/
typedef int
(*SPDYF_IOAfterWrite) (struct SPDY_Session *session,
int was_written);
/**
* Sets callbacks for the daemon with regard to the IO subsystem.
*
* @param daemon
* @param io_subsystem the IO subsystem that will
* be initialized and used by daemon.
* @return SPDY_YES on success or SPDY_NO otherwise
*/
int
SPDYF_io_set_daemon(struct SPDY_Daemon *daemon,
enum SPDY_IO_SUBSYSTEM io_subsystem);
/**
* Sets callbacks for the session with regard to the IO subsystem.
*
* @param session
* @param io_subsystem the IO subsystem that will
* be initialized and used by session.
* @return SPDY_YES on success or SPDY_NO otherwise
*/
int
SPDYF_io_set_session(struct SPDY_Session *session,
enum SPDY_IO_SUBSYSTEM io_subsystem);
#endif
|