Hi,
Since golang is so awesome in it's network abilities, I wrote a simple
inetd super server, but my network connections come encrypted with SSL,
instead of plain-text. This program runs great as it is, my client
communicates and send and receives data from the server's exec-ed program,
but the problem is that the server exec-ed program does not sense a close
on stdin when the client closes the network connection. In the log, I will
see the 'Start received', but I will never see the 'Command terminated',
and the processes are still running.
Thank you for any help or suggestions,
Kevin Johnson
Here is the code:
package main
import (
"crypto/rand"
"crypto/tls"
"crypto/x509"
"io"
"io/ioutil"
"log"
"net"
"os"
"os/exec"
)
func main() {
if len(os.Args) > 1 {
dogen()
return
}
log.SetFlags(log.Lshortfile)
ca_b, _ := ioutil.ReadFile("/etc/sinetd/ca.pem")
ca, _ := x509.ParseCertificate(ca_b)
priv_b, _ := ioutil.ReadFile("/etc/sinetd/ca.key")
priv, _ := x509.ParsePKCS1PrivateKey(priv_b)
pool := x509.NewCertPool()
pool.AddCert(ca)
cert := tls.Certificate{
Certificate: [][]byte{ca_b},
PrivateKey: priv,
}
config := tls.Config{
ClientAuth: tls.NoClientCert,
Certificates: []tls.Certificate{cert},
ClientCAs: pool,
}
config.Rand = rand.Reader
listener, err := tls.Listen("tcp", ":823", &config)
if err != nil {
log.Fatal(err)
}
defer listener.Close()
for {
conn, err := listener.Accept()
if err != nil {
log.Println(err)
continue
}
go handleConnection(conn)
}
}
func handleConnection(conn net.Conn) {
defer conn.Close()
// read to make sure they are who we want them to be
buf := make([]byte, 512)
n, err := conn.Read(buf)
if err != nil {
log.Print(err)
}
if n > 0 {
cmd := string(buf[:n-1])
if cmd == "START" {
log.Println("Start received")
cmd := exec.Command("/usr/local/sbin/MyService")
cmd.Stdin = conn
cmd.Stdout = conn
if err := cmd.Run(); err != nil {
log.Print(err)
}
log.Println("Command terminated")
} else {
log.Println("Unknown command:", cmd)
}
}
}
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