Telnet Client
To create a Telnet client program in Go, you need to create a few files: main.go for the main logic and optionally, a client.go file for the client 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 telnetclient
cd telnetclient
go mod init github.com/username/telnetclient
Step 2: Create the client.go File
Create a client.go file to handle the Telnet client functionality.
// client.go
package main
import (
"bufio"
"fmt"
"net"
"os"
)
// ConnectToServer connects to the Telnet server and handles communication.
func ConnectToServer(address string) error {
conn, err := net.Dial("tcp", address)
if err != nil {
return err
}
defer conn.Close()
go func() {
scanner := bufio.NewScanner(conn)
for scanner.Scan() {
fmt.Println(scanner.Text())
}
}()
scanner := bufio.NewScanner(os.Stdin)
for scanner.Scan() {
_, err := fmt.Fprintf(conn, "%s\n", scanner.Text())
if err != nil {
return err
}
}
return scanner.Err()
}
Step 3: Create the main.go File
Create a main.go file to use the client functionality.
// main.go
package main
import (
"fmt"
"os"
)
func main() {
if len(os.Args) != 2 {
fmt.Println("Usage: telnetclient <address>")
os.Exit(1)
}
address := os.Args[1]
fmt.Printf("Connecting to Telnet server at %s...\n", address)
if err := ConnectToServer(address); err != nil {
fmt.Printf("Connection failed: %v\n", err)
os.Exit(1)
}
}
Step 4: Run the Program
Run the program using the go run command.
go run main.go localhost:2323
This will connect the Telnet client to the server running on localhost at port 2323. You can interact with the server through the client.
Last modified: 19 December 2024