WHOIS协议Python和Golang的实现

WHOIS协议是一个非常简单的Internet信息查询协议；在RFC812文档中有定义，先向服务器的TCP 43端口建立一个连接，发送要查询的域名关键字并以回车换行结尾，然后接收服务器返回信息，服务器输出完毕后会立即断开连接。

RFC812文档：http://www.faqs.org/rfcs/rfc812.html

Python实现：

import socket
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect(('whois.internic.net', 43))
s.send(b"baidu.com \r\n")
response =b''
while True:
    data = s.recv(4096)
    response += data
    if not data :
        break
s.close()
print (response.decode())

Golang 实现：

package main
import (
    "io"
    "fmt"
    "net"
)
func main() {
    conn,_ := net.Dial("tcp","whois.internic.net:43")

    conn.Write([]byte("baidu.com \r\n"))

    buf := make([]byte,4096)
    n,err := conn.Read(buf)
    if err != nil && err != io.EOF {
        fmt.Println(err)
    }
    fmt.Println(string(buf[:n]))
    conn.Close()
}

返回的部分内容：

   Domain Name: BAIDU.COM
   Registry Domain ID: 11181110_DOMAIN_COM-VRSN
   Registrar WHOIS Server: whois.markmonitor.com
   Registrar URL: http://www.markmonitor.com
   Updated Date: 2019-05-09T04:30:46Z
   Creation Date: 1999-10-11T11:05:17Z
   Registry Expiry Date: 2026-10-11T11:05:17Z
   Registrar: MarkMonitor Inc.
   Registrar IANA ID: 292
   Registrar Abuse Contact Email: abusecomplaints@markmonitor.com
   Registrar Abuse Contact Phone: +1.2083895740
   Domain Status: clientDeleteProhibited https://icann.org/epp#clientDeleteProhibited
   Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
   Domain Status: clientUpdateProhibited https://icann.org/epp#clientUpdateProhibited
   Domain Status: serverDeleteProhibited https://icann.org/epp#serverDeleteProhibited
   Domain Status: serverTransferProhibited https://icann.org/epp#serverTransferProhibited
   Domain Status: serverUpdateProhibited https://icann.org/epp#serverUpdateProhibited
   Name Server: NS1.BAIDU.COM
   Name Server: NS2.BAIDU.COM
   Name Server: NS3.BAIDU.COM
   Name Server: NS4.BAIDU.COM
   Name Server: NS7.BAIDU.COM
   DNSSEC: unsigned
   URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/