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
|
/* 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.
*/
#include "proxy_http_int.h"
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include "qemu-common.h"
/* A HttpConnector implements a non-HTTP proxied connection
* through the CONNECT method. Many firewalls are configured
* to reject these for port 80, so these connections should
* use a HttpRewriter instead.
*/
typedef enum {
STATE_NONE = 0,
STATE_CONNECTING, /* connecting to the server */
STATE_SEND_HEADER, /* connected, sending header to the server */
STATE_RECEIVE_ANSWER_LINE1,
STATE_RECEIVE_ANSWER_LINE2 /* connected, reading server's answer */
} ConnectorState;
typedef struct Connection {
ProxyConnection root[1];
ConnectorState state;
} Connection;
static void
connection_free( ProxyConnection* root )
{
proxy_connection_done(root);
qemu_free(root);
}
#define HTTP_VERSION "1.1"
static int
connection_init( Connection* conn )
{
HttpService* service = (HttpService*) conn->root->service;
ProxyConnection* root = conn->root;
stralloc_t* str = root->str;
proxy_connection_rewind(root);
stralloc_add_format(str, "CONNECT %s HTTP/" HTTP_VERSION "\r\n",
sock_address_to_string(&root->address));
stralloc_add_bytes(str, service->footer, service->footer_len);
if (!socket_connect( root->socket, &service->server_addr )) {
/* immediate connection ?? */
conn->state = STATE_SEND_HEADER;
PROXY_LOG("%s: immediate connection", root->name);
}
else {
if (errno == EINPROGRESS || errno == EWOULDBLOCK) {
conn->state = STATE_CONNECTING;
PROXY_LOG("%s: connecting", root->name);
}
else {
PROXY_LOG("%s: cannot connect to proxy: %s", root->name, errno_str);
return -1;
}
}
return 0;
}
static void
connection_select( ProxyConnection* root,
ProxySelect* sel )
{
unsigned flags;
Connection* conn = (Connection*)root;
switch (conn->state) {
case STATE_RECEIVE_ANSWER_LINE1:
case STATE_RECEIVE_ANSWER_LINE2:
flags = PROXY_SELECT_READ;
break;
case STATE_CONNECTING:
case STATE_SEND_HEADER:
flags = PROXY_SELECT_WRITE;
break;
default:
flags = 0;
};
proxy_select_set(sel, root->socket, flags);
}
static void
connection_poll( ProxyConnection* root,
ProxySelect* sel )
{
DataStatus ret = DATA_NEED_MORE;
Connection* conn = (Connection*)root;
int fd = root->socket;
if (!proxy_select_poll(sel, fd))
return;
switch (conn->state)
{
case STATE_CONNECTING:
PROXY_LOG("%s: connected to http proxy, sending header", root->name);
conn->state = STATE_SEND_HEADER;
break;
case STATE_SEND_HEADER:
ret = proxy_connection_send(root, fd);
if (ret == DATA_COMPLETED) {
conn->state = STATE_RECEIVE_ANSWER_LINE1;
PROXY_LOG("%s: header sent, receiving first answer line", root->name);
}
break;
case STATE_RECEIVE_ANSWER_LINE1:
case STATE_RECEIVE_ANSWER_LINE2:
ret = proxy_connection_receive_line(root, root->socket);
if (ret == DATA_COMPLETED) {
if (conn->state == STATE_RECEIVE_ANSWER_LINE1) {
int http1, http2, codenum;
const char* line = root->str->s;
if ( sscanf(line, "HTTP/%d.%d %d", &http1, &http2, &codenum) != 3 ) {
PROXY_LOG( "%s: invalid answer from proxy: '%s'",
root->name, line );
ret = DATA_ERROR;
break;
}
/* success is 2xx */
if (codenum/2 != 100) {
PROXY_LOG( "%s: connection refused, error=%d",
root->name, codenum );
proxy_connection_free( root, 0, PROXY_EVENT_CONNECTION_REFUSED );
return;
}
PROXY_LOG("%s: receiving second answer line", root->name);
conn->state = STATE_RECEIVE_ANSWER_LINE2;
proxy_connection_rewind(root);
} else {
/* ok, we're connected */
PROXY_LOG("%s: connection succeeded", root->name);
proxy_connection_free( root, 1, PROXY_EVENT_CONNECTED );
}
}
break;
default:
PROXY_LOG("%s: invalid state for read event: %d", root->name, conn->state);
}
if (ret == DATA_ERROR) {
proxy_connection_free( root, 0, PROXY_EVENT_SERVER_ERROR );
}
}
ProxyConnection*
http_connector_connect( HttpService* service,
SockAddress* address )
{
Connection* conn;
int s;
s = socket_create_inet( SOCKET_STREAM );
if (s < 0)
return NULL;
conn = qemu_mallocz(sizeof(*conn));
if (conn == NULL) {
socket_close(s);
return NULL;
}
proxy_connection_init( conn->root, s, address, service->root,
connection_free,
connection_select,
connection_poll );
if ( connection_init( conn ) < 0 ) {
connection_free( conn->root );
return NULL;
}
return conn->root;
}
|
