Telnet Server
To create a Telnet server program in Go, you need to create a few files: main.go for the main logic and optionally, a server.go file for the server functionality. Here is a step-by-step guide:
Step 1: Initialize the Go Module
First, create a new directory for your project and initialize the Go module.
mkdir telnetserver
cd telnetserver
go mod init github.com/username/telnetserver
Step 2: Create the server.go File
Create a server.go file to handle the Telnet server functionality.
// server.go
package main
import (
"bufio"
"fmt"
"net"
"strings"
)
// handleConnection handles incoming Telnet connections.
func handleConnection(conn net.Conn) {
defer conn.Close()
reader := bufio.NewReader(conn)
for {
conn.Write([]byte("> "))
input, err := reader.ReadString('\n')
if err != nil {
return
}
input = strings.TrimSpace(input)
if input == "exit" {
return
}
response := fmt.Sprintf("You said: %s\n", input)
conn.Write([]byte(response))
}
}
// StartServer starts the Telnet server on the specified port.
func StartServer(port string) error {
listener, err := net.Listen("tcp", ":"+port)
if err != nil {
return err
}
defer listener.Close()
fmt.Printf("Telnet server started on port %s\n", port)
for {
conn, err := listener.Accept()
if err != nil {
return err
}
go handleConnection(conn)
}
}
Step 3: Create the main.go File
Create a main.go file to use the server functionality.
// main.go
package main
import (
"fmt"
"os"
)
func main() {
if len(os.Args) != 2 {
fmt.Println("Usage: telnetserver <port>")
os.Exit(1)
}
port := os.Args[1]
fmt.Printf("Starting Telnet server on port %s...\n", port)
if err := StartServer(port); err != nil {
fmt.Printf("Server failed: %v\n", err)
os.Exit(1)
}
}
Step 4: Run the Program
Run the program using the go run command.
go run main.go 2323
This will start the Telnet server on port 2323. You can connect to it using a Telnet client.
Last modified: 19 December 2024