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Linux如何查看端口
1、lsof -i:端口号 用于查看某一端口的占用情况,比如查看8000端口使用情况,lsof -i:8000
# lsof -i:8000 COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME lwfs 22065 root 6u IPv4 4395053 0t0 TCP *:irdmi (LISTEN)
可以看到8000端口已经被轻量级文件系统转发服务lwfs占用
2、netstat -tunlp |grep 端口号,用于查看指定的端口号的进程情况,如查看8000端口的情况,netstat -tunlp |grep 8000
# netstat -tunlp Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 4814/rpcbind tcp 0 0 0.0.0.0:5908 0.0.0.0:* LISTEN 25492/qemu-kvm tcp 0 0 0.0.0.0:6996 0.0.0.0:* LISTEN 22065/lwfs tcp 0 0 192.168.122.1:53 0.0.0.0:* LISTEN 38296/dnsmasq tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 5278/sshd tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN 5013/cupsd tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 5962/master tcp 0 0 0.0.0.0:8666 0.0.0.0:* LISTEN 44868/lwfs tcp 0 0 0.0.0.0:8000 0.0.0.0:* LISTEN 22065/lwfs
# netstat -tunlp | grep 8000 tcp 0 0 0.0.0.0:8000 0.0.0.0:* LISTEN 22065/lwfs
说明一下几个参数的含义:
-t (tcp) 仅显示tcp相关选项 -u (udp)仅显示udp相关选项 -n 拒绝显示别名,能显示数字的全部转化为数字 -l 仅列出在Listen(监听)的服务状态 -p 显示建立相关链接的程序名
附加一个python端口占用监测的程序,该程序可以监测指定IP的端口是否被占用。
1 #!/usr/bin/env python 2 # -*- coding:utf-8 -*- 3 4 import socket, time, thread 5 socket.setdefaulttimeout(3) #设置默认超时时间 6 7 def socket_port(ip, port): 8 """ 9 输入IP和端口号,扫描判断端口是否占用 10 """ 11 try: 12 if port >=65535: 13 print u'端口扫描结束' 14 s=socket.socket(socket.AF_INET, socket.SOCK_STREAM) 15 result=s.connect_ex((ip, port)) 16 if result==0: 17 lock.acquire() 18 print ip,u':',port,u'端口已占用' 19 lock.release() 20 except: 21 print u'端口扫描异常' 22 23 def ip_scan(ip): 24 """ 25 输入IP,扫描IP的0-65534端口情况 26 """ 27 try: 28 print u'开始扫描 %s' % ip 29 start_time=time.time() 30 for i in range(0,65534): 31 thread.start_new_thread(socket_port,(ip, int(i))) 32 print u'扫描端口完成,总共用时:%.2f' %(time.time()-start_time) 33 # raw_input("Press Enter to Exit") 34 except: 35 print u'扫描ip出错' 36 37 if __name__=='__main__': 38 url=raw_input('Input the ip you want to scan: ') 39 lock=thread.allocate_lock() 40 ip_scan(url)
该程序执行结果如下:
# python scan_port.py Input the ip you want to scan: 20.0.208.112 开始扫描 20.0.208.112 20.0.208.112 : 111 端口已占用 20.0.208.112 : 22 端口已占用 20.0.208.112 : 8000 端口已占用 20.0.208.112 : 15996 端口已占用 20.0.208.112 : 41734 端口已占用 扫描端口完成,总共用时:9.38