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
|
/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2019-2020 WireGuard LLC. All Rights Reserved.
*/
package winhttp
import (
"fmt"
"io"
"runtime"
"strconv"
"strings"
"sync/atomic"
"syscall"
"unsafe"
"golang.org/x/sys/windows"
)
type Session struct {
handle _HINTERNET
}
type Connection struct {
handle _HINTERNET
session *Session
https bool
}
type Response struct {
handle _HINTERNET
connection *Connection
}
func convertError(err *error) {
if *err == nil {
return
}
if se, ok := (*err).(syscall.Errno); ok {
if se > _WINHTTP_ERROR_BASE && se <= _WINHTTP_ERROR_LAST {
*err = Error(se)
}
}
}
func isWin7() bool {
maj, min, _ := windows.RtlGetNtVersionNumbers()
return maj < 6 || (maj == 6 && min <= 1)
}
func NewSession(userAgent string) (session *Session, err error) {
session = new(Session)
defer convertError(&err)
defer func() {
if err != nil {
session.Close()
session = nil
}
}()
userAgent16, err := windows.UTF16PtrFromString(userAgent)
if err != nil {
return
}
var proxyFlag uint32 = _WINHTTP_ACCESS_TYPE_AUTOMATIC_PROXY
if isWin7() {
proxyFlag = _WINHTTP_ACCESS_TYPE_DEFAULT_PROXY
}
session.handle, err = winHttpOpen(userAgent16, proxyFlag, nil, nil, 0)
if err != nil {
return
}
var enableHttp2 uint32 = 1
_ = winHttpSetOption(session.handle, _WINHTTP_OPTION_ENABLE_HTTP_PROTOCOL, unsafe.Pointer(&enableHttp2), uint32(unsafe.Sizeof(enableHttp2))) // Don't check return value, in case of old Windows
runtime.SetFinalizer(session, func(session *Session) {
session.Close()
})
return
}
func (session *Session) Close() (err error) {
defer convertError(&err)
handle := (_HINTERNET)(atomic.SwapUintptr((*uintptr)(&session.handle), 0))
if handle == 0 {
return
}
return winHttpCloseHandle(handle)
}
func (session *Session) Connect(server string, port uint16, https bool) (connection *Connection, err error) {
connection = &Connection{session: session}
defer convertError(&err)
defer func() {
if err != nil {
connection.Close()
connection = nil
}
}()
server16, err := windows.UTF16PtrFromString(server)
if err != nil {
return
}
connection.handle, err = winHttpConnect(session.handle, server16, port, 0)
if err != nil {
return
}
connection.https = https
runtime.SetFinalizer(connection, func(connection *Connection) {
connection.Close()
})
return
}
func (connection *Connection) Close() (err error) {
defer convertError(&err)
handle := (_HINTERNET)(atomic.SwapUintptr((*uintptr)(&connection.handle), 0))
if handle == 0 {
return
}
return winHttpCloseHandle(handle)
}
func (connection *Connection) Get(path string, refresh bool) (response *Response, err error) {
response = &Response{connection: connection}
defer convertError(&err)
defer func() {
if err != nil {
response.Close()
response = nil
}
}()
var flags uint32
if refresh {
flags |= _WINHTTP_FLAG_REFRESH
}
if connection.https {
flags |= _WINHTTP_FLAG_SECURE
}
path16, err := windows.UTF16PtrFromString(path)
if err != nil {
return
}
get16, err := windows.UTF16PtrFromString("GET")
if err != nil {
return
}
response.handle, err = winHttpOpenRequest(connection.handle, get16, path16, nil, nil, nil, flags)
if err != nil {
return
}
err = winHttpSendRequest(response.handle, nil, 0, nil, 0, 0, 0)
if err != nil {
return
}
err = winHttpReceiveResponse(response.handle, 0)
if err != nil {
return
}
runtime.SetFinalizer(response, func(response *Response) {
response.Close()
})
return
}
func (response *Response) Length() (length uint64, err error) {
defer convertError(&err)
numBuf := make([]uint16, 22)
numLen := uint32(len(numBuf) * 2)
err = winHttpQueryHeaders(response.handle, _WINHTTP_QUERY_CONTENT_LENGTH, nil, unsafe.Pointer(&numBuf[0]), &numLen, nil)
if err != nil {
return
}
length, err = strconv.ParseUint(windows.UTF16ToString(numBuf[:numLen]), 10, 64)
if err != nil {
return
}
return
}
func (response *Response) Read(p []byte) (n int, err error) {
defer convertError(&err)
if len(p) == 0 {
return 0, nil
}
var bytesRead uint32
err = winHttpReadData(response.handle, &p[0], uint32(len(p)), &bytesRead)
if err != nil {
return 0, nil
}
if bytesRead == 0 || int(bytesRead) < 0 {
return 0, io.EOF
}
return int(bytesRead), nil
}
func (response *Response) Close() (err error) {
defer convertError(&err)
handle := (_HINTERNET)(atomic.SwapUintptr((*uintptr)(&response.handle), 0))
if handle == 0 {
return
}
return winHttpCloseHandle(handle)
}
func (error Error) Error() string {
var message [2048]uint16
n, err := windows.FormatMessage(windows.FORMAT_MESSAGE_FROM_HMODULE|windows.FORMAT_MESSAGE_IGNORE_INSERTS|windows.FORMAT_MESSAGE_MAX_WIDTH_MASK,
modwinhttp.Handle(), uint32(error), 0, message[:], nil)
if err != nil {
return fmt.Sprintf("WinHTTP error #%d", error)
}
return strings.TrimSpace(windows.UTF16ToString(message[:n]))
}
|
