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 sys
import os
import socket
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
def getlocalip():
localip = socket.gethostbyname(socket.gethostname())
return localip
def 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, startport
def findport(startport):
while true:
flag, endport = checknineport(startport)
if (flag == true): #nineport is ok
break
else:
startport = endport + 1
return startport
def 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 321
tcp 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/java
tcp 0 0 0.0.0.0:3215 0.0.0.0:* listen 54272/java
tcp 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 os
import platform
import sys
def 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 portisuse
def 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 portisuse
def 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 portisuse
def 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 portisuse
def 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 portisuse
def 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, startport
def findport(startport):
while true:
flag, endport = checknineport(startport)
if (flag == true): # nineport is ok
break
else:
startport = endport + 1
return startport
def main(startport):
firstport=findport(startport)
print ‘first port of nine free ports is ‘, firstport
if name == ‘main’ :
if len(sys.argv) > 1:
print len(sys.argv)
startport = int(sys.argv[1])
else:
startport = 500
main(startport)

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