Python的socket模块为操作系统的socket实现提供了一个python接口。

In [168]: import socket

In [169]: s=socket.socket()

In [170]: s.connect(("127.0.0.1",80))

In [171]: s.send("GET / HTTP/1.1\n\n")

Out[171]: 16

In [172]: s.recv(200)

Out[172]: 'HTTP/1.1 400 Bad Request\r\nServer: nginx\r\nDate: Mon, 21 Jul 2014 02:34:14 GMT\r\nContent-Type: text/html\r\nContent-Length: 166\r\nConnection: close\r\n\r\n\r\n\r\n

In [173]: s.close()

先创建一个名为s的socket对象，然后连接到本地的Nginx服务器，这里要注意一下connect只能带一个参数，如果是IP和端口对需要用括号括住。然后通过send()函数发送一个HTTP请求，然后接收服务端响应的前200个字节。最后关闭socket连接

#/usr/bin/python

import socket

import re

import sys

def check_server(address, port):

s=socket.socket()

print "Attempting to connect to %s on port %s" %(address,port)

try:

s.connect((address,port))

print "Connected to %s on port %s" %(address,port)

return True

except socket.error,e:

print "Connection to %s on port %s failed: %s" %(address,port,e)

return False

if __name__ == '__main__':

from optparse import OptionParser

parser = OptionParser()

parser.add_option("-a", "--address", dest="address",default='localhost', help="Address for the server", metavar="ADDRESS")

parser.add_option("-p", "--port", dest="port",type="int", default=80,help="PORT for server",metavar="PORT")

(options, args) = parser.parse_args()

print 'options: %s,args: %s' %(options,args)

check=check_server(options.address,options.port)

print 'check server returned %s' %check

sys.exit(not check)

以上程序用于探测远程主机的端口状态，通过socket的connect()函数去尝试连接远程主机的给定端口。后面主要用到optparse模块添加选项。

$ python tcp_port_checker.py -a 10.10.41.20 -p 80

options: {'port': 80, 'address': '10.10.41.20'},args: []

Attempting to connect to 10.10.41.20 on port 80

Connected to 10.10.41.20 on port 80

check server returned True

$ python tcp_port_checker.py -a 10.10.41.20 -p 80 && echo "SUCCESS"

options: {'port': 80, 'address': '10.10.41.20'},args: []

Attempting to connect to 10.10.41.20 on port 80

Connected to 10.10.41.20 on port 80

check server returned True

SUCCESS

$ python tcp_port_checker.py -a 10.10.41.20 -p 81 || echo "FAILURE"

options: {'port': 81, 'address': '10.10.41.20'},args: []

Attempting to connect to 10.10.41.20 on port 81

Connection to 10.10.41.20 on port 81 failed: [Errno 111] Connection refused

check server returned False

FAILURE

一个web server的80端口开放并不能代表这台服务器上就运行着web服务，还需要通过HTTP响应返回值来判断。

#/usr/bin/python

import socket

import re

import sys

def check_webserver(address,port,resource):

if not resource.startswith('/'):

resource = '/' + resource

request_string = "GET %s HTTP/1.1\r\nHost: %s\r\n\r\n" %(resource,address)

print 'HTTP request:'

print '|||%s|||' %request_string

s=socket.socket()

print "Attempting to connect to %s on port %s" %(address,port)

try:

s.connect((address,port))

print "Connected to %s on port %s" %(address,port)

s.send(request_string)

rsp=s.recv(100)

print "Received 100 bytes of HTTP response"

print '|||%s|||' %rsp

except socket.error,e:

print "Connection to %s on port %s failed: %s" %(address,port,e)

print "Closing the connection"

s.close()

lines=rsp.splitlines()

print "First line of HTTP response: %s" %lines[0]

try:

version,status,message=re.split(r'\s+',lines[0],2)

print 'Version: %s, Status: %s, Message: %s' %(version,status,message)

except ValueError: