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
|
package xgb
/*
auth.go contains functions to facilitate the parsing of .Xauthority files.
It is largely unmodified from the original XGB package that I forked.
*/
import (
"encoding/binary"
"errors"
"io"
"os"
)
// readAuthority reads the X authority file for the DISPLAY.
// If hostname == "" or hostname == "localhost",
// then use the system's hostname (as returned by os.Hostname) instead.
func readAuthority(hostname, display string) (
name string, data []byte, err error) {
// b is a scratch buffer to use and should be at least 256 bytes long
// (i.e. it should be able to hold a hostname).
b := make([]byte, 256)
// As per /usr/include/X11/Xauth.h.
const familyLocal = 256
const familyWild = 65535
if len(hostname) == 0 || hostname == "localhost" {
hostname, err = os.Hostname()
if err != nil {
return "", nil, err
}
}
fname := os.Getenv("XAUTHORITY")
if len(fname) == 0 {
home := os.Getenv("HOME")
if len(home) == 0 {
err = errors.New("Xauthority not found: $XAUTHORITY, $HOME not set")
return "", nil, err
}
fname = home + "/.Xauthority"
}
r, err := os.Open(fname)
if err != nil {
return "", nil, err
}
defer r.Close()
for {
var family uint16
if err := binary.Read(r, binary.BigEndian, &family); err != nil {
return "", nil, err
}
addr, err := getString(r, b)
if err != nil {
return "", nil, err
}
disp, err := getString(r, b)
if err != nil {
return "", nil, err
}
name0, err := getString(r, b)
if err != nil {
return "", nil, err
}
data0, err := getBytes(r, b)
if err != nil {
return "", nil, err
}
addrmatch := (family == familyWild) ||
(family == familyLocal && addr == hostname)
dispmatch := (disp == "") || (disp == display)
if addrmatch && dispmatch {
return name0, data0, nil
}
}
panic("unreachable")
}
func getBytes(r io.Reader, b []byte) ([]byte, error) {
var n uint16
if err := binary.Read(r, binary.BigEndian, &n); err != nil {
return nil, err
} else if n > uint16(len(b)) {
return nil, errors.New("bytes too long for buffer")
}
if _, err := io.ReadFull(r, b[0:n]); err != nil {
return nil, err
}
return b[0:n], nil
}
func getString(r io.Reader, b []byte) (string, error) {
b, err := getBytes(r, b)
if err != nil {
return "", err
}
return string(b), nil
}
|
