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main.go
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main.go
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package main
import (
"bufio"
"flag"
"fmt"
"net"
"os"
"os/signal"
"strings"
"syscall"
"github.com/csmith/envflag"
)
var (
response = flag.String("response", "ident", "Response to ident request")
port = flag.Int("port", 8000, "Port to listen on")
)
func main() {
envflag.Parse()
sigWait := make(chan os.Signal, 1)
signal.Notify(sigWait, os.Interrupt, syscall.SIGTERM, syscall.SIGQUIT)
done := make(chan bool, 1)
go func() {
<-sigWait
done <- true
}()
fmt.Println("Starting Identd")
listener, err := net.Listen("tcp", fmt.Sprintf(":%d", *port))
if err != nil {
fmt.Printf("Unable to listen: %s\r\n", err.Error())
return
}
go handleConnections(listener)
<-done
_ = listener.Close()
fmt.Println("Exiting.")
}
func handleConnections(listener net.Listener) {
for {
c, err := listener.Accept()
if err != nil {
fmt.Println(err)
break
}
go handleConnection(c)
}
}
func handleConnection(c net.Conn) {
line, _, _ := bufio.NewReader(c).ReadLine()
data := strings.Split(strings.ReplaceAll(string(line), " ", ""), ",")
if len(data) != 2 {
_ = c.Close()
return
}
_, _ = c.Write([]byte(fmt.Sprintf("%s, %s : USERID : UNIX : %s\r\n", strings.TrimSpace(data[0]), strings.TrimSpace(data[1]), *response)))
_ = c.Close()
}