-
Notifications
You must be signed in to change notification settings - Fork 0
/
http-mangler.go
80 lines (66 loc) · 1.26 KB
/
http-mangler.go
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
package main
import ("bufio"
"fmt"
"io"
"net"
"os"
"regexp"
"strings"
)
func handleConnection(s net.Conn) {
local, err := net.Dial("tcp", "localhost:80")
if err != nil {
s.Close()
fmt.Println("Could not connect to localhost:80; ",err);
return
}
close := func() { s.Close(); local.Close(); }
sr := bufio.NewReader(s)
lr := bufio.NewReader(local)
go func() {
done := false
for ; !done ; {
line, err := sr.ReadString('\n')
if err != nil {
close()
return
}
if strings.HasPrefix(line, "Connection: ") {
continue;
}
if line == "\n" || line == "\r\n" {
line = "Connection: close\n\n";
done = true;
}
io.Copy(local, strings.NewReader(line))
}
io.Copy(local, sr)
close()
}()
go func() {
line, err := lr.ReadString('\n')
matched, _ := regexp.MatchString("^HTTP/... 200 .*", line);
if err != nil || !matched {
close()
return
}
io.Copy(s, strings.NewReader(line));
io.Copy(s, lr)
close()
}()
}
func main() {
ss, err := net.Listen("tcp", ":8080");
if err != nil {
fmt.Println("Could not listen on port 8080; ",err);
os.Exit(1);
}
for {
s, err := ss.Accept();
if err != nil {
fmt.Println("Failed to accept connection; ", err);
continue;
}
go handleConnection(s);
}
}