基于socket的web服务器检测

# coding=utf-8
import sys
import socket
import re

def check_webserver(address, port, resource):
    address = socket.gethostbyname(address)

    if not resource.startswith(‘/‘):
        resource = ‘/‘ + resource

    request_string = ‘GET %s HTTP/1.0\r\n\r\n‘ % (resource)
    print ‘HTTP request: |||%s||||‘ % request_string
    s = socket.socket()
    failed = False
    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)
        resp = s.recv(100)
        print ‘Received 100 bytes of HTTP response‘
        print ‘|||%s|||‘ % resp
    except socket.error as e:
        print ‘Connection to %s on port %s failed: %s‘ % (address, port, e)
        failed = True
    finally:
        print ‘Close the connection‘
        s.close()

    if failed:
        return False

    lines = resp.splitlines()
    print ‘First line of HTTP response: %s‘ % lines[0]
    try:
        version, status, message = re.split(‘\s+‘, lines[0], 2)
    except ValueError:
        print ‘Failed to split status line‘
        return False

    if status in [‘200‘, ‘301‘]:
        print ‘Success - status was %s‘ % status
        return True
    else:
        print ‘Failure - Status was %s‘ % status
        return False

if __name__ == ‘__main__‘:
    from argparse import ArgumentParser
    parser = ArgumentParser(description=u"基于socket的web服务器检测")
    parser.add_argument(
        ‘-a‘,
        ‘--address‘,
        dest="address",
        default="localhost",
        help="address for the server")
    parser.add_argument(
        "-p",
        "--port",
        dest="port",
        type=int,
        default=80,
        help="port for the server")
    parser.add_argument(
        "-r",
        ‘--resource‘,
        dest=‘resource‘,
        default="index.html",
        help="resouce to check")
    args = parser.parse_args()
    check = check_webserver(args.address, args.port, args.resource)
    print ‘check_webserver returned: %s‘ % check
    sys.exit(not check)