使用Python进行TCP端口扫描

首先咱们供给一台主机，要进行的步骤就是对其主机端口的扫描，查看其中开放的端口。

咱们建立一个TCP的全链接的扫描器，使用socket来建立链接器。

扫描端口开放

#测试当前主机和端口是否开放，直接使用socket链接
def connScan(host,port):
    try:
        connSkt = socket.socket(socket.AF_INET, socket.SOCK_STREAM) 
        connSkt.connect((host,port))
        print("tcp open port:" + str(port))
    except:
        print('tcp closed:'+str(port))

def portScan(tgtHost, tgtPorts):    
    try:        
        tgtIP = socket.gethostbyname(tgtHost)  
    except:        
        print("[-] Cannot resolve '%s': Unknown host" % tgtHost)        
        return   
    try:        
        tgtName = socket.gethostbyaddr(tgtIP)   print('\n[+] Scan Results for: ' + tgtName[0])
    except:        
        print('\n[+] Scan Results for: ' + tgtIP)
    socket.setdefaulttimeout(1)    
    for tgtPort in tgtPorts:        
        print('Scanning port ' + str(tgtPort))        connScan(tgtHost, int(tgtPort))

portScan('www.baidu.com', [80,443,3389,1433,23,445])

对百度的端口进行扫描

[+] Scan Results for: 61.135.169.125
Scanning port 80
tcp open port:80
Scanning port 443
tcp open port:443
Scanning port 3389
tcp closed:3389
Scanning port 1433
tcp closed:1433
Scanning port 23
tcp closed:23
Scanning port 445
tcp closed:445

捕获应用标识

为了从捕获咱们的目标主机的应用标识，咱们必须首先插入额外的验证代码到 connScan函数中。一旦发现开放的端口，咱们发送一个字符串数据到这个端 口而后等待响应。收集这些响应并推断可能会获得运行在目标主机端口上的应 用程序的一些信息。

#测试当前主机和端口是否开放，直接使用socket链接
def connScan(host,port):
    try:
        connSkt = socket.socket(socket.AF_INET, socket.SOCK_STREAM) 
        connSkt.connect((host,port))
        connSkt.send('Python\r\n')
        results = connSkt.recv(100)
        print("tcp open port:" + str(port))
        print('[+] ' + str(results)) 
    except:
        print('tcp closed:'+str(port))
def portScan(tgtHost, tgtPorts):    
    try:        
        tgtIP = socket.gethostbyname(tgtHost)  
    except:        
        print("[-] Cannot resolve '%s': Unknown host" % tgtHost)        
        return   
    try:        
        tgtName = socket.gethostbyaddr(tgtIP)       
        print('\n[+] Scan Results for: ' + tgtName[0])
    except:        
        print('\n[+] Scan Results for: ' + tgtIP)
    socket.setdefaulttimeout(1)    
    for tgtPort in tgtPorts:        
        print('Scanning port ' + str(tgtPort))        
        connScan(tgtHost, int(tgtPort))
portScan('www.qq.com', [22,80,443,3389,1433,23,445])

多线程扫描

由于每个socket都有时间延迟，每个socket扫描都将会耗时几秒钟，虽 然看起来无足轻重，可是若是咱们扫描多个端口和主机延迟时间将迅速增大。 理想状况下，咱们但愿这些socket按顺序扫描。引入Python线程。线程提供 了一种同时执行的方式。在咱们的扫描中利用线程，只需将 portScan()函数的迭代改一下。请注意，咱们能够把每个connScan()函数都 当作是一个线程。在迭代的过程当中产生的每个线程将在同时执行。

for tgtPort in tgtPorts:
    print('Scanning port ' + str(tgtPort))
    t = threading.Thread(target=connScan, args=(tgtHost,
    int(tgtPort)))
    t.start()

使用nmap

import nmap
def nmapScan(tgtHost, tgtPort):
    nmScan = nmap.PortScanner()
    results = nmScan.scan(tgtHost, tgtPort)
    state = results['scan'][tgtHost]['tcp'][int(tgtPort)]['state']
    print(" [*] " + tgtHost + " tcp/" + tgtPort + " " + state)
    nmapScan('10.108.x.x','8080')

原文连接：https://www.jianshu.com/p/e261308d796c