{"id":331,"date":"2014-08-17T22:31:19","date_gmt":"2014-08-17T14:31:19","guid":{"rendered":"http:\/\/www.ipcpu.com\/?p=331"},"modified":"2014-08-17T22:31:19","modified_gmt":"2014-08-17T14:31:19","slug":"bash-tcp-port","status":"publish","type":"post","link":"https:\/\/c.ipcpu.com\/2014\/08\/bash-tcp-port\/","title":{"rendered":"\u5982\u4f55\u6279\u91cf\u68c0\u6d4b\u7aef\u53e3\u8fde\u901a\u6027\u3001\u7aef\u53e3\u662f\u5426\u5f00\u653e\uff08\u4e8c\uff09"},"content":{"rendered":"

\u5982\u4f55\u6279\u91cf\u68c0\u6d4b\u7aef\u53e3\u8fde\u901a\u6027\u3001\u7aef\u53e3\u662f\u5426\u5f00\u653e\uff08\u4e8c\uff09<\/h2>\n

\u672c\u7ad9\u4e4b\u524d\u6709\u7bc7\u7528nc\u6765\u63a2\u6d4b\u7aef\u53e3\u662f\u5426\u8fde\u901a\u7684\u6587\u7ae0\uff0c\u70b9\u6211\u67e5\u770b<\/a><\/p>\n

\u7aef\u53e3\u63a2\u6d4b\u65e0\u975e\u4e5f\u5c31\u662ftelnet\u3001nc\u7684\u547d\u4ee4\uff0c\u7528\u6cd5\u57fa\u672c\u5982\u4e0b\uff1a<\/p>\n

  1. [<\/span>root@SY<\/span>-<\/span>68<\/span>-<\/span>2<\/span> <\/span>~]#<\/span>echo <\/span>\"bye\"<\/span> <\/span>|<\/span> timeout <\/span>3<\/span> telnet www<\/span>.<\/span>baidu<\/span>.<\/span>com <\/span>81<\/span><\/code><\/li>
  2. Trying<\/span> <\/span>61.135<\/span>.<\/span>169.121<\/span>...<\/span><\/code><\/li>
  3. [<\/span>root@SY<\/span>-<\/span>68<\/span>-<\/span>2<\/span> <\/span>~]#<\/span>echo <\/span>\"bye\"<\/span> <\/span>|<\/span> timeout <\/span>3<\/span> telnet www<\/span>.<\/span>baidu<\/span>.<\/span>com <\/span>80<\/span><\/code><\/li>
  4. Trying<\/span> <\/span>61.135<\/span>.<\/span>169.125<\/span>...<\/span><\/code><\/li>
  5. Connected<\/span> to www<\/span>.<\/span>baidu<\/span>.<\/span>com<\/span>.<\/span><\/code><\/li>
  6. Escape<\/span> character <\/span>is<\/span> <\/span>'^]'<\/span>.<\/span><\/code><\/li>
  7. Connection<\/span> closed <\/span>by<\/span> foreign host<\/span>.<\/span><\/code><\/li>
  8. [<\/span>root@SY<\/span>-<\/span>68<\/span>-<\/span>2<\/span> <\/span>~]#<\/span><\/code><\/li>
  9. [<\/span>root@SY<\/span>-<\/span>33<\/span>-<\/span>2<\/span> <\/span>~]#<\/span> nc <\/span>-<\/span>z <\/span>-<\/span>w <\/span>5<\/span> www<\/span>.<\/span>baidu<\/span>.<\/span>com <\/span>80<\/span> <\/span>&&<\/span> echo OK <\/span>||<\/span> echo <\/span>Failed<\/span><\/code><\/li>
  10. Connection<\/span> to www<\/span>.<\/span>baidu<\/span>.<\/span>com <\/span>80<\/span> port <\/span>[<\/span>tcp<\/span>\/<\/span>http<\/span>]<\/span> succeeded<\/span>!<\/span><\/code><\/li>
  11. OK<\/span><\/code><\/li>
  12. [<\/span>root@SY<\/span>-<\/span>68<\/span>-<\/span>2<\/span> <\/span>~]#<\/span> nc <\/span>-<\/span>z <\/span>-<\/span>w <\/span>5<\/span> www<\/span>.<\/span>baidu<\/span>.<\/span>com <\/span>81<\/span> <\/span>&&<\/span> echo OK <\/span>||<\/span> echo <\/span>Failed<\/span><\/code><\/li>
  13. Failed<\/span><\/code><\/li>
  14. [<\/span>root@SY<\/span>-<\/span>68<\/span>-<\/span>2<\/span> <\/span>~]#<\/span><\/code><\/li><\/ol><\/pre>\n
    \u4eca\u5929\u6211\u4eec\u6765\u4ecb\u7ecd\u4e00\u79cd\u65b0\u7684bash\u81ea\u8eab\u5305\u542b\u7684\u4e00\u79cd\u65b9\u5f0f\uff1a
    \/dev\/tcp\/host\/port \u548c \/dev\/udp\/host\/port<\/p>\n
    \u7528\u6cd5\u4e5f\u5f88\u7b80\u5355\uff1a<\/p>\n
    1. [<\/span>root@SY<\/span>-<\/span>68<\/span>-<\/span>2<\/span> <\/span>~]#<\/span> echo <\/span>><\/span>\/dev\/<\/span>tcp<\/span>\/<\/span>www<\/span>.<\/span>baidu<\/span>.<\/span>com<\/span>\/<\/span>80<\/span> <\/span>&&<\/span> echo <\/span>\"port 80 is open\"<\/span> <\/span>||<\/span> echo <\/span>\"port 80 is closed\"<\/span><\/code><\/li>
    2. port <\/span>80<\/span> <\/span>is<\/span> open<\/span><\/code><\/li>
    3. [<\/span>root@SY<\/span>-<\/span>68<\/span>-<\/span>2<\/span> <\/span>~]#<\/span><\/code><\/li><\/ol><\/pre>\n
      \u4f46\u8fd9\u79cd\u7528\u6cd5\u672c\u8eab\u662f\u4e0d\u5e26\u8d85\u65f6\u65f6\u95f4\u8bbe\u7f6e\u7684\uff0c\u5e78\u597d\u6211\u4eec\u6709timeout\u547d\u4ee4\uff0c\u7ec4\u5408\u8d77\u6765\u4fbf\u662f\uff1a<\/p>\n
      1. [<\/span>root@SY<\/span>-<\/span>68<\/span>-<\/span>2<\/span> <\/span>~]#<\/span>timeout <\/span>5<\/span> bash <\/span>-<\/span>c <\/span>\"echo >\/dev\/tcp\/www.baidu.com\/80\"<\/span> <\/span>><\/span> <\/span>\/dev\/<\/span>null<\/span> <\/span>2<\/span>>&<\/span>1<\/span> <\/span>&&<\/span> echo <\/span>\"port 80 is open\"<\/span> <\/span>||<\/span> echo <\/span>\"port 80 is closed\"<\/span><\/code><\/li>
      2. port <\/span>80<\/span> <\/span>is<\/span> open<\/span><\/code><\/li>
      3. [<\/span>root@SY<\/span>-<\/span>68<\/span>-<\/span>2<\/span> <\/span>~]#<\/span><\/code><\/li>
      4. [<\/span>root@SY<\/span>-<\/span>68<\/span>-<\/span>2<\/span> <\/span>~]#<\/span>timeout <\/span>5<\/span> bash <\/span>-<\/span>c <\/span>\"echo >\/dev\/tcp\/www.baidu.com\/8080\"<\/span> <\/span>><\/span> <\/span>\/dev\/<\/span>null<\/span> <\/span>2<\/span>>&<\/span>1<\/span> <\/span>&&<\/span> echo <\/span>\"port 8080 is open\"<\/span> <\/span>||<\/span> echo <\/span>\"port 8080 is closed\"<\/span><\/code><\/li>
      5. port <\/span>8080<\/span> <\/span>is<\/span> closed<\/span><\/code><\/li>
      6. [<\/span>root@SY<\/span>-<\/span>68<\/span>-<\/span>2<\/span> <\/span>~]#<\/span><\/code><\/li><\/ol><\/pre>\n
        \u5c31\u662f\u5982\u6b64\uff0c\u5199\u4e00\u4e2afor\u5faa\u73af\uff0c\u4fbf\u53ef\u4ee5\u6279\u91cf\u68c0\u6d4b\u4e86\u3002<\/p>\n
        \u6837\u4f8b\u6587\u4ef6\u5982\u4e0b\uff1a<\/p>\n
        1. #cat ports<\/span><\/code><\/li>
        2. 119.181<\/span>.<\/span>69.96<\/span> <\/span>8080<\/span><\/code><\/li>
        3. 220.181<\/span>.<\/span>111.188<\/span> <\/span>80<\/span><\/code><\/li>
        4. 119.181<\/span>.<\/span>20.18<\/span> <\/span>8080<\/span><\/code><\/li>
        5. 202.108<\/span>.<\/span>22.220<\/span> <\/span>53<\/span><\/code><\/li><\/ol><\/pre>\n
          \u811a\u672c\u548c\u8f93\u51fa\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n
          1. cat  ports      <\/span>|<\/span>  <\/span>while<\/span> read line<\/span><\/code><\/li>
          2. do<\/span><\/code><\/li>
          3. <\/code><\/li>
          4.   IP<\/span>=<\/span>`echo $line |awk '{print $1}'`<\/span><\/code><\/li>
          5.   PORT<\/span>=<\/span>`echo $line |awk '{print $2}'`<\/span><\/code><\/li>
          6. <\/code><\/li>
          7.  timeout <\/span>5<\/span> bash <\/span>-<\/span>c <\/span>\"echo >\/dev\/tcp\/$IP\/$PORT\"<\/span> <\/span>><\/span> <\/span>\/dev\/<\/span>null<\/span> <\/span>2<\/span>>&<\/span>1<\/span> <\/span>&&<\/span> echo <\/span>\"$IP $PORT is open\"<\/span> <\/span>||<\/span> echo <\/span>\"$IP $PORT is closed\"<\/span><\/code><\/li>
          8. <\/code><\/li>
          9. done<\/span><\/code><\/li>
          10. <\/code><\/li>
          11. # sh test.sh <\/span><\/code><\/li>
          12. 119.181<\/span>.<\/span>69.96<\/span> <\/span>8080<\/span> <\/span>is<\/span> closed<\/span><\/code><\/li>
          13. 220.181<\/span>.<\/span>111.188<\/span> <\/span>80<\/span> <\/span>is<\/span> open<\/span><\/code><\/li>
          14. 119.181<\/span>.<\/span>20.18<\/span> <\/span>8080<\/span> <\/span>is<\/span> closed<\/span><\/code><\/li>
          15. 202.108<\/span>.<\/span>22.220<\/span> <\/span>53<\/span> <\/span>is<\/span> open<\/span><\/code><\/li><\/ol><\/pre>\n
            \u6765\u81ea\u4e3a\u77e5\u7b14\u8bb0(Wiz)<\/a><\/div>\n
            \u8f6c\u8f7d\u8bf7\u6ce8\u660e\uff1aIPCPU-\u7f51\u7edc\u4e4b\u8def<\/a> » \u5982\u4f55\u6279\u91cf\u68c0\u6d4b\u7aef\u53e3\u8fde\u901a\u6027\u3001\u7aef\u53e3\u662f\u5426\u5f00\u653e\uff08\u4e8c\uff09<\/a><\/p>","protected":false},"excerpt":{"rendered":"
            \u5982\u4f55\u6279\u91cf\u68c0\u6d4b\u7aef\u53e3\u8fde\u901a\u6027\u3001\u7aef\u53e3\u662f\u5426\u5f00\u653e\uff08\u4e8c\uff09 \u672c\u7ad9\u4e4b\u524d\u6709\u7bc7\u7528nc\u6765\u63a2\u6d4b\u7aef\u53e3\u662f\u5426\u8fde\u901a\u7684\u6587\u7ae0\uff0c\u70b9\u6211\u67e5\u770b \u7aef\u53e3\u63a2\u6d4b\u65e0\u975e\u4e5f\u5c31\u662ftelnet\u3001nc\u7684\u547d\u4ee4\uff0c\u7528\u6cd5\u57fa\u672c\u5982\u4e0b\uff1a [root@SY-68-2 ~]#echo “bye” | timeout 3 telnet www.baidu.com 81Trying 61.135.169.121…[root@SY-68-2 ~]#echo “bye” | timeout 3 telnet www.baidu.com 80Trying 61.135.169.125…Connected to www.baidu.com.Escape character is ‘^]’.Connection closed by foreign host.[root@SY-68-2 ~]#[root@SY-33-2 ~]# nc -z -w 5 www.baidu.com 80 && echo OK || echo FailedConnection to www.baidu.com 80 port [tcp\/http] succeeded!OK[root@SY-68-2 ~]# nc -z -w […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[3,13],"tags":[17],"_links":{"self":[{"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/posts\/331"}],"collection":[{"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/comments?post=331"}],"version-history":[{"count":0,"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/posts\/331\/revisions"}],"wp:attachment":[{"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/media?parent=331"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/categories?post=331"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/tags?post=331"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}