Hi,
I am experiencing an issue in *Conn.Write() which is not detecting that the
connection was closed in the server.
Below you can find demo SSL server and client which hosted on same go
project.
The problem is that the following line doesn't detect closed
socket/connection:
conn.Write([]byte("hello\n"))
Below is the full code:
package main
import (
"bufio"
"crypto/tls"
"log"
"net"
"time"
)
func handleConnection(conn net.Conn) {
defer conn.Close()
r := bufio.NewReader(conn)
for {
msg, err := r.ReadString('\n')
if err != nil {
log.Println(err)
return
}
println(msg)
n, err := conn.Write([]byte("world\n"))
if err != nil {
log.Println(n, err)
return
}
}
}
func server() {
log.SetFlags(log.Lshortfile)
cer, err := tls.LoadX509KeyPair("cert.crt", "key.key")
if err != nil {
log.Println(err)
return
}
config := &tls.Config{Certificates: []tls.Certificate{cer}}
ln, err := tls.Listen("tcp", ":5000", config)
if err != nil {
log.Println(err)
return
}
defer ln.Close()
sConn, err = ln.Accept()
if err != nil {
log.Println(err)
}
handleConnection(sConn)
}
var sConn net.Conn
func client() {
log.SetFlags(log.Lshortfile)
conf := &tls.Config{
InsecureSkipVerify: true,
}
conn, err := tls.Dial("tcp", "127.0.0.1:5000", conf)
if err != nil {
log.Println(err)
return
}
//close the server connection to simulate Write() doesn't detect closed
socket/connection
sConn.Close()
//Should return err. but instead it returns n =6 and err = nil.
//would expect it to return n=0 and socket/connection is closed
n, err := conn.Write([]byte("hello\n"))
if err != nil {
log.Println(n, err)
return
}
buf := make([]byte, 100)
n, err = conn.Read(buf)
if err != nil {
log.Println(n, err)
return
}
println(string(buf[:n]))
}
func main() {
go func() {
server();
}()
//sleep to make sure server hits ln.Accept()
time.Sleep(time.Second * 2)
client()
}
The only code that detects that a connection/socket is closed it
conn.Read() or r.ReadString()
I appreciate the help.
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