Python查看远程主机端口是否开放以及BashShell实现

无论是选择Python还是选择Bash Shell都可以很容易检测远程主机端口是否开放，下面的Python例子纯属锦上添花，仅供参考！
源码可参见Github：https://raw.githubusercontent.com/DingGuodong/LinuxBashShellScriptForOps/master/functions/net/tcp/port/checkRemoteHostPortStatus.py
使用方法：如果用户使用不带参数的方式执行，则需要用户修改Python脚本参数host和port，如果用户使用带参数的方式执行则需要加host和port默认用空格隔开或者参考usage()函数。
源码如下：

#!/usr/bin/python
# encoding: utf-8
# -*- coding: utf8 -*-
import socket
import sys
# import os
import time

def usage():
print("""
Function: check remote host's tcp port if is open
Usage: %s <host ipaddress> <tcp port>
Example: python %s 127.0.0.1 22
Others useful cli:
strace time:
strace -q -f -c python checkRemoteHostPortStatus.py 127.0.0.1 22
Bash shell implement:
nc -w 3 127.0.0.1 22 >/dev/null 2>&1 && echo ok || echo failed
nmap 127.0.0.1 -p 22 | grep open >/dev/null 2>&1 && echo ok || echo failed

""") % (__file__, sys.argv[0])
sys.exit(0)

host = ""
port = 0
timeout = 3
retry = 3

argc = len(sys.argv)
if not (argc == 1 or argc == 3):
print("Error: incorrect number of arguments or unrecognized option")
usage()
if argc == 1:
pass
else:
if sys.argv[1] is not None:
host = sys.argv[1]

if sys.argv[2] is not None:
port = sys.argv[2]

if host == "":
print "host is empty, please sign new one."
sys.exit(1)
if port == 0:
print "port is empty, please sign new one."
sys.exit(1)
else:
try:
type(int(port)) is not int
except ValueError:
print type(port)
print "type port \"%s\" is not int, please sign new one" % port
sys.exit(1)

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.settimeout(timeout)

for attempt in range(0, retry):
try:
s.connect((str(host), int(port)))
print "connect to server %s port %s successfully!" % (host, port)
break
except Exception:
print "connect to server %s port %s failed in %s times! " % (host, port, attempt + 1)
# os.system("sleep 1")
time.sleep(1)

s.close()

tag:python,检测端口,远程端口
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