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Use Python to find 9 consecutive idle ports
- 高洛峰Original
- 2017-03-13 18:06:451400browse
This article mainly introduces the method of Python to find 9 consecutive idle ports. Interested friends can refer to it
1. Project requirements
When installing a certain software, you need to fill in the free port during configuration. Check whether a certain port on the 5 platforms is occupied
The 5 platforms are windows, linux, aix, hp, solaris
2. The implementation plan is Two ways
1. Use the
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 flagin the try module if s.connect((ip, int(port))) If it succeeds, it means that the port is occupied.
Otherwise, if connect fails, it will enter except, which means that the port is not occupied.
But there is a problem. In addition to "127.0.0.1" and "0.0.0.0", the port listening IP may also be the local area network IP of the machine such as 222.25.136.17, or the IP of the machine communicating with it.
You can get the LAN ip through this method
def getLocalIp(): localIP = socket.gethostbyname(socket.gethostname()) return localIP
This code is only for ipList = ("127.0.0.1" ,"0.0.0.0",getLocalIp()) Connect these 3 IPs
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. Use netstat output information to find the port Number matching
The accuracy of the first method depends on the ip in connect((ip, int(port))). What kind of ip set is complete to ensure that this port is not occupied?
So, there is the following method
**Use netstat -tnpl in Linux to get the port monitoring information,
Observe tcp 0 0 10.173.1.208:3210 0.0.0.0 :* LISTEN 55563/repserver
10.173.1.208:3210 appears, so port 3210 is occupied
Search for this information:5000, if it exists, it means that port 5000 is LISTEN* *.
If the relevant characters of :5000 do not exist in the output result, it means that this port is not occupied.
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/***
Based on this idea, the code is given.
AIX, HP, WINDOWS, LINUX, and SOLARIS platforms have different ways of viewing port information.
First determine the machine platform
Then call the port occupancy judgment of each platformFunction
If you want to find out the consecutive ports, as long as one port is occupied, jump out of the loop
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)##Summary of relevant knowledge points
os.popen()
You can call some shell commands of the system
##os.popen().readlines()
Read the echo information after calling the shell command
netstat -tnpl -tnpl 各个参数的含义 -l或--listening 显示监控中的服务器的Socket。 -n或--numeric 直接使用IP地址，而不通过域名服务器。 -p或--programs 显示正在使用Socket的程序识别码和程序名称。 -t或--tcp 显示TCP传输协议的连线状况 ---------- tcp 0 0 10.173.1.208:4903 0.0.0.0:* LISTEN 54849/jsagent 最后的54849/jsagent 表示 进程号 54849 进程名 jsagent
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