linux 端口tnpl,利用Python找出9个连续的空闲端口

这篇文章主要介绍了Python找出9个连续的空闲端口的方法，感兴趣的小伙伴们可以参考一下

一、项目需求

安装某软件，配置时候需要填写空闲的端口。查看5个平台的某个端口是否被占用

5个平台为windows, linux, aix, hp, solaris

二、实现方案有两种

1、利用 python 的 socket 模块里的

def isInuse(ipList, port): s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) flag=True for ip in ipList: try: s.connect((ip, int(port))) s.shutdown(2) print '%d is inuse' % port flag=True break except: print '%d is free' % port flag=False return flag

在try 模块中如果 s.connect((ip, int(port))) 如果能成功, 说明端口被占用.

否则, connect 不成功, 会进到except 中, 说明端口不被占用.

但是有个问题, 端口监听的ip 除了 "127.0.0.1","0.0.0.0" 还有可能是本机的局域网ip 如 222.25.136.17 ，或者与之通信的那台机器的ip。

可以通过这个方法获得局域网 ip

def getLocalIp(): localIP = socket.gethostbyname(socket.gethostname()) return localIP

本代码只针对 ipList = ("127.0.0.1","0.0.0.0",getLocalIp()) 这3个 ip 进行 connect

import sysimport osimport socketdef isInuse(ipList, port): s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) flag=True for ip in ipList: try: s.connect((ip, int(port))) s.shutdown(2) print '%d is inuse' % port flag=True break except: print '%d is free' % port flag=False return flagdef getLocalIp(): localIP = socket.gethostbyname(socket.gethostname()) return localIPdef checkNinePort(startPort): flag = True ipList = ("127.0.0.1","0.0.0.0",getLocalIp()) for i in range(1, 10): if (isInuse(ipList, startPort)): flag = False break else: startPort = startPort + 1 return flag, startPortdef findPort(startPort): while True: flag, endPort = checkNinePort(startPort) if (flag == True): #ninePort is ok break else: startPort = endPort + 1 return startPortdef main(): startPort=51988 # startPort = int(sys.argv[1]) print findPort(startPort)main()

2. 利用netstat 输出信息查找端口号匹配

第一种方法的准确性依赖于 connect((ip, int(port))) 中的 ip，到底怎样的 ip 集合才是完备的, 可以确定这个端口不被占用?

于是, 有下面这个方法

**在 linux 用 netstat -tnpl 可以得到端口监听信息,

观察 tcp 0 0 10.173.1.208:3210 0.0.0.0:* LISTEN 55563/repserver

出现了 10.173.1.208:3210 所以 3210 端口是被占用的

对这些信息进行搜索 :5000, 如果存在, 就表示5000端口是LISTEN**.

如果输出结果中不存在 :5000 的相关字符，表示这个端口不被占用.

netstat - tnpl | grep 321tcp 0 0 10.173.1.208:3211 0.0.0.0:* LISTEN 55563/***tcp 0 0 0.0.0.0:3212 0.0.0.0:* LISTEN 55586/***tcp 0 0 10.173.1.208:3213 0.0.0.0:* LISTEN 55707/***tcp 0 0 0.0.0.0:3214 0.0.0.0:* LISTEN 54272/javatcp 0 0 0.0.0.0:3215 0.0.0.0:* LISTEN 54272/javatcp 0 0 10.173.1.208:3216 0.0.0.0:* LISTEN 54822/***tcp 0 0 10.173.1.208:3217 0.0.0.0:* LISTEN 34959/***tcp 0 0 10.173.1.208:3218 0.0.0.0:* LISTEN 54849/***

依据这个思路, 给出代码.

AIX 、HP 、WINDOWS、 LINUX、 SOLARIS 这几个平台查看端口信息的方式不同,

先进行机器平台的判断

然后调用各个平台的端口占用判断函数

如果要找出连续端口, 其中只要有一个端口占用, 就跳出循环

author = 'I316736'import osimport platformimport sysdef isInuseWindow(port): if os.popen('netstat -an | findstr :' + str(port)).readlines(): portIsUse = True print '%d is inuse' % port else: portIsUse = False print '%d is free' % port return portIsUsedef isInuseLinux(port): #lsof -i:4906 #not show pid to avoid complex if os.popen('netstat -na | grep :' + str(port)).readlines(): portIsUse = True print '%d is inuse' % port else: portIsUse = False print '%d is free' % port return portIsUsedef isInuseAix(port): if os.popen('netstat -Aan | grep "\.' + str(port) + ' "').readlines(): portIsUse = True print '%d is inuse' % port else: portIsUse = False print '%d is free' % port return portIsUsedef isInuseHp(port): if os.popen('netstat -an | grep "\.' + str(port) + ' "').readlines(): portIsUse = True print '%d is inuse' % port else: portIsUse = False print '%d is free' % port return portIsUsedef isInuseSun(port): if os.popen('netstat -an | grep "\.' + str(port) + ' "').readlines(): portIsUse = True print '%d is inuse' % port else: portIsUse = False print '%d is free' % port return portIsUsedef choosePlatform(): #'Windows-7-6.1.7601-SP1' #'AIX-1-00F739CE4C00-powerpc-32bit' #'HP-UX-B.11.31-ia64-32bit' #'Linux-3.0.101-0.35-default-x86_64-with-SuSE-11-x86_64' #'SunOS-5.10-sun4u-sparc-32bit-ELF' machine = platform.platform().lower() if 'windows-' in machine: return isInuseWindow elif 'linux-' in machine: return isInuseLinux elif 'aix-' in machine: return isInuseAix elif 'hp-' in machine: return isInuseHp elif 'sunos-' in machine: return isInuseSun else: print 'Error, sorry, platform is unknown' exit(-1)def checkNinePort(startPort): isInuseFun = choosePlatform() nineIsFree = True for i in range(1, 10): if (isInuseFun(startPort)): nineIsFree = False break else: startPort = startPort + 1 return nineIsFree, startPortdef findPort(startPort): while True: flag, endPort = checkNinePort(startPort) if (flag == True): # ninePort is ok break else: startPort = endPort + 1 return startPortdef main(startPort): firstPort=findPort(startPort) print 'First port of nine free ports is ', firstPortif name == 'main' : if len(sys.argv) > 1: print len(sys.argv) startPort = int(sys.argv[1]) else: startPort = 500 main(startPort)