1 files changed, 51 insertions, 0 deletions
diff --git a/whois.go b/whois.go
new file mode 100644
index 0000000..c2f4f76
--- /dev/null
+++ b/whois.go
@@ -0,0 +1,51 @@
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"net"
+	"time"
+)
+
+const (
+	WHOIS_SERVER = /*"whois-servers.net"*/ "whois.cymru.com"
+	WHOIS_PORT   = "43"
+	TIMEOUT      = 30
+	RETRIES      = 1
+)
+
+func main() {
+	domains := []string{"109.105.104.100", "123.123.123.123"}
+	res, err := whois(domains, WHOIS_SERVER)
+	if err != nil {
+		return
+	}
+	fmt.Println(res)
+}
+
+/* implements the whois protocal described at https://en.wikipedia.org/wiki/Whois#Protocol */
+func whois(domains []string, server string) (answer string, err error) {
+	var conn net.Conn
+	for i := 0; i < RETRIES; i++ {
+		conn, err = net.DialTimeout("tcp", net.JoinHostPort(server, WHOIS_PORT), time.Second*TIMEOUT)
+		if err != nil {
+			return
+		}
+	}
+	defer conn.Close()
+
+	//conn.Write([]byte(" -p " + domain + "\r\n"))
+	conn.Write([]byte(" -p -o -f -u begin\r\n"))
+	for _, d := range domains {
+		conn.Write([]byte(d + "\r\n"))
+	}
+	conn.Write([]byte("end\r\n"))
+
+	buffer, err := ioutil.ReadAll(conn)
+	if err != nil {
+		return
+	}
+
+	answer = string(buffer[:])
+	return
+}