Whois
To create a Whois program in Go, you need to create a few files: main.go for the main logic, and optionally, a whois.go file for the Whois 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 whois
cd whois
go mod init github.com/username/whois
Step 2: Create the whois.go File
Create a whoismod/whois.go file to handle the Whois functionality.
// whois.go
package whois
import (
"bufio"
"fmt"
"net"
"strings"
"time"
)
// Whois performs a whois query for the given domain and returns the result.
func Whois(domain string) (string, error) {
conn, err := net.DialTimeout("tcp", "whois.nic.google:43", time.Second*10)
if err != nil {
return "", err
}
defer conn.Close()
fmt.Fprintf(conn, "%s\r\n", domain)
scanner := bufio.NewScanner(conn)
var result strings.Builder
for scanner.Scan() {
result.WriteString(scanner.Text() + "\n")
}
if err := scanner.Err(); err != nil {
return "", err
}
return result.String(), nil
}
Step 3: Create the main.go File
Create a main.go file to use the Whois functionality.
// main.go
package main
import (
"fmt"
"os"
whois "github.com/username/whois/whoismod"
)
func main() {
if len(os.Args) != 2 {
fmt.Println("Usage: whois <domain>")
os.Exit(1)
}
domain := os.Args[1]
result, err := whois.Whois(domain)
if err != nil {
fmt.Printf("Whois query for %s failed: %v\n", domain, err)
os.Exit(1)
}
fmt.Printf("Whois result for %s:\n%s", domain, result)
}
Step 4: Run the Program
Run the program using the go run command.
go run main.go example.com
This will output the Whois information for the specified domain.
Last modified: 08 January 2025