Python检查端口是否打开的七种方法总结

import socket

def check_port(ip, port):  
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)  
    sock.settimeout(5)  
  
    try:  
        result = sock.connect_ex((ip, port))  
        if result == 0:  
            return True
        else:  
            return False
    except Exception as e:  
        print(f"错误: {str(e)}")  
    finally:  
        sock.close()
        
host = 'localhost'
port = 80
if check_port(host, port):
    print(f'The port {port} on {host} is open.')
else:
    print(f'The port {port} on {host} is closed.')

import socket

def check_port(host, port):
    try:
        sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        sock.settimeout(1)
        sock.connect((host, port))
        sock.close()
        return True
    except:
        return False
    finally:  
        sock.close()

import os  
  
def check_port(ip, port):  
    result = os.system(f"telnet {ip} {port} > /dev/null 2>&1")  
    if result == 0:  
        print(f"端口 {port} 是开放的")  
    else:  
        print(f"端口 {port} 是关闭的")

import os  
  
def check_port(ip, port):  
    result = os.system(f"nc -zv {ip} {port} > /dev/null 2>&1")  
    if result == 0:  
        print(f"端口 {port} 是开放的")  
    else:  
        print(f"端口 {port} 是关闭的")

import os  
  
def check_port(ip, port):  
    result = os.system(f"ping {ip} -n {port} > /dev/null 2>&1")  
    if result == 0:  
        print(f"端口 {port} 是开放的")  
    else:  
        print(f"端口 {port} 是关闭的")

import requests  
  
def check_port(ip, port):  
    try:  
        response = requests.get(f"http://{ip}:{port}")  
        if response.status_code == 200:  
            print(f"端口 {port} 是开放的")  
        else:  
            print(f"端口 {port} 是关闭的")  
    except requests.exceptions.ConnectionError:  
        print(f"端口 {port} 是关闭的")

from scapy.all import *  
  
def check_port(ip, port):  
    # 构造一个ICMP数据包，并发送到目标IP地址和端口  
    packet = IP(dst=ip) / ICMP() / Raw(load=str(port))  
    # 发送数据包并获取响应  
    response = sr1(packet, timeout=1)  
    # 检查响应是否为ICMP错误类型  
    if response is None or response.type != ICMP.DEST_UNREACH:  
        print(f"端口 {port} 是开放的")  
    else:  
        print(f"端口 {port} 是关闭的")  
  
# 测试函数  
check_port('127.0.0.1', 80)