57 lines
1.4 KiB
Go
57 lines
1.4 KiB
Go
|
package internal
|
||
|
|
|
||
|
|
import (
|
||
|
|
"net"
|
||
|
|
"time"
|
||
|
|
)
|
||
|
|
|
||
|
|
// SleeperWriter is a net.Conn that optionally sleeps for the
|
||
|
|
// specified delay before posting each write.
|
||
|
|
type SleeperWriter struct {
|
||
|
|
net.Conn
|
||
|
|
Delay time.Duration
|
||
|
|
}
|
||
|
|
|
||
|
|
func (c SleeperWriter) Write(b []byte) (int, error) {
|
||
|
|
<-time.After(c.Delay)
|
||
|
|
return c.Conn.Write(b)
|
||
|
|
}
|
||
|
|
|
||
|
|
// SplitterWriter is a writer that splits every outgoing buffer
|
||
|
|
// according to the rules specified by the Splitter.
|
||
|
|
//
|
||
|
|
// Caveat
|
||
|
|
//
|
||
|
|
// The TLS ClientHello may be retransmitted if the server is
|
||
|
|
// requesting us to restart the negotiation. Therefore, it is
|
||
|
|
// not safe to just run the splitting once. Since this code
|
||
|
|
// is meant to investigate TLS blocking, that's fine.
|
||
|
|
type SplitterWriter struct {
|
||
|
|
net.Conn
|
||
|
|
Splitter func([]byte) [][]byte
|
||
|
|
}
|
||
|
|
|
||
|
|
// Write implements net.Conn.Write
|
||
|
|
func (c SplitterWriter) Write(b []byte) (int, error) {
|
||
|
|
if c.Splitter != nil {
|
||
|
|
return Writev(c.Conn, c.Splitter(b))
|
||
|
|
}
|
||
|
|
return c.Conn.Write(b)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Writev writes all the vectors inside datalist using the specified
|
||
|
|
// conn. Returns either an error or the number of bytes sent. Note
|
||
|
|
// that this function skips any empty entry in datalist.
|
||
|
|
func Writev(conn net.Conn, datalist [][]byte) (int, error) {
|
||
|
|
var total int
|
||
|
|
for _, data := range datalist {
|
||
|
|
if len(data) > 0 {
|
||
|
|
count, err := conn.Write(data)
|
||
|
|
if err != nil {
|
||
|
|
return 0, err
|
||
|
|
}
|
||
|
|
total += count
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return total, nil
|
||
|
|
}
|