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
|
/* Copyright (C) 2007-2008 The Android Open Source Project
**
** This software is licensed under the terms of the GNU General Public
** License version 2, as published by the Free Software Foundation, and
** may be copied, distributed, and modified under those terms.
**
** 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.
*/
#ifndef _PROXY_INT_H
#define _PROXY_INT_H
#include "proxy_common.h"
#include "sockets.h"
#include "android/utils/stralloc.h"
extern int proxy_log;
extern void
proxy_LOG(const char* fmt, ...);
#define PROXY_LOG(...) \
do { if (proxy_log) proxy_LOG(__VA_ARGS__); } while (0)
/* ProxySelect is used to handle events */
enum {
PROXY_SELECT_READ = (1 << 0),
PROXY_SELECT_WRITE = (1 << 1),
PROXY_SELECT_ERROR = (1 << 2)
};
typedef struct {
int* pcount;
fd_set* reads;
fd_set* writes;
fd_set* errors;
} ProxySelect;
extern void proxy_select_set( ProxySelect* sel,
int fd,
unsigned flags );
extern unsigned proxy_select_poll( ProxySelect* sel, int fd );
/* sockets proxy manager internals */
typedef struct ProxyConnection ProxyConnection;
typedef struct ProxyService ProxyService;
/* free a given proxified connection */
typedef void (*ProxyConnectionFreeFunc) ( ProxyConnection* conn );
/* modify the ProxySelect to tell which events to listen to */
typedef void (*ProxyConnectionSelectFunc) ( ProxyConnection* conn,
ProxySelect* sel );
/* action a proxy connection when select() returns certain events for its socket */
typedef void (*ProxyConnectionPollFunc) ( ProxyConnection* conn,
ProxySelect* sel );
/* root ProxyConnection object */
struct ProxyConnection {
int socket;
SockAddress address; /* for debugging */
ProxyConnection* next;
ProxyConnection* prev;
ProxyEventFunc ev_func;
void* ev_opaque;
ProxyService* service;
/* the following is useful for all types of services */
char name[64]; /* for debugging purposes */
stralloc_t str[1]; /* network buffer (dynamic) */
int str_pos; /* see proxy_connection_send() */
int str_sent; /* see proxy_connection_send() */
int str_recv; /* see proxy_connection_receive() */
/* connection methods */
ProxyConnectionFreeFunc conn_free;
ProxyConnectionSelectFunc conn_select;
ProxyConnectionPollFunc conn_poll;
/* rest of data depend on exact implementation */
};
extern void
proxy_connection_init( ProxyConnection* conn,
int socket,
SockAddress* address,
ProxyService* service,
ProxyConnectionFreeFunc conn_free,
ProxyConnectionSelectFunc conn_select,
ProxyConnectionPollFunc conn_poll );
extern void
proxy_connection_done( ProxyConnection* conn );
/* free the proxy connection object. this will also
* close the corresponding socket unless the
* 'keep_alive' flag is set to TRUE.
*/
extern void
proxy_connection_free( ProxyConnection* conn,
int keep_alive,
ProxyEvent event );
/* status of data transfer operations */
typedef enum {
DATA_ERROR = -1,
DATA_NEED_MORE = 0,
DATA_COMPLETED = 1
} DataStatus;
/* try to send data from the connection's buffer to a socket.
* starting from offset conn->str_pos in the buffer
*
* returns DATA_COMPLETED if everything could be written
* returns DATA_ERROR for a socket disconnection or error
* returns DATA_NEED_MORE if all data could not be sent.
*
* on exit, conn->str_sent contains the number of bytes
* that were really sent. conn->str_pos will be incremented
* by conn->str_sent as well.
*
* note that in case of success (DATA_COMPLETED), this also
* performs a proxy_connection_rewind which sets conn->str_pos
* to 0.
*/
extern DataStatus
proxy_connection_send( ProxyConnection* conn, int fd );
/* try to read 'wanted' bytes into conn->str from a socket
*
* returns DATA_COMPLETED if all bytes could be read
* returns DATA_NEED_MORE if not all bytes could be read
* returns DATA_ERROR in case of socket disconnection or error
*
* on exit, the amount of data received is in conn->str_recv
*/
extern DataStatus
proxy_connection_receive( ProxyConnection* conn, int fd, int wanted );
/* tries to receive a line of text from the proxy.
* when an entire line is read, the trailing \r\n is stripped
* and replaced by a terminating zero. str->n will be the
* lenght of the line, exclusing the terminating zero.
* returns 1 when a line has been received
* returns 0 if there is still some data to receive
* returns -1 in case of error
*/
extern DataStatus
proxy_connection_receive_line( ProxyConnection* conn, int fd );
/* rewind the string buffer for a new operation */
extern void
proxy_connection_rewind( ProxyConnection* conn );
/* base64 encode a source string, returns size of encoded result,
* or -1 if there was not enough room in the destination buffer
*/
extern int
proxy_base64_encode( const char* src, int srclen,
char* dst, int dstlen );
extern int
proxy_resolve_server( SockAddress* addr,
const char* servername,
int servernamelen,
int serverport );
/* a ProxyService is really a proxy server and associated options */
/* destroy a given proxy service */
typedef void (*ProxyServiceFreeFunc) ( void* opaque );
/* tries to create a new proxified connection, returns NULL if the service can't
* handle this address */
typedef ProxyConnection* (*ProxyServiceConnectFunc)( void* opaque,
SocketType socket_type,
const SockAddress* address );
struct ProxyService {
void* opaque;
ProxyServiceFreeFunc serv_free;
ProxyServiceConnectFunc serv_connect;
};
extern int
proxy_manager_add_service( ProxyService* service );
#endif /* _PROXY_INT_H */
|
