Hi, here’s a simple port scanner I wrote today in Java.
\nI needed to see something on my server, perhaps you can find it useful. I would say its pretty fast, you can tweak the number of threads and timeouts to adjust to your server\/connection. I did’t do much testing on it, just a few tweaks and I was happy with the speed of it.<\/p>\n
Good for learning a bit of Java (Threads, Sockets)<\/p>\n
\nimport java.net.*;\nimport java.util.*;\nimport java.io.*;\n\n\/** \n By Gubatron - 05-18-2005 \n Simple Fast Port Scanner\n*\/\npublic class PortScanner implements Runnable {\n int port;\n static int MAX_PORT = 65536;\n static int THREADS = 0;\n static int MAX_THREADS = 250;\n static int TIMEOUT = 50;\n static String TARGET = new String(\"www.yahoo.com\");\n\n public PortScanner(int p) {\n this.port = p;\n };\n\n\n public synchronized void run() {\n\n THREADS++;\n\n\n try {\n Socket s = new Socket();\n\n s.connect(new InetSocketAddress(TARGET,this.port), \n TIMEOUT);\n System.out.println(\"Port \" + this.port + \" is open\");\n s.close();\n } catch (Exception e) {\n }\n\n THREADS--;\n\n }\n\n public static void main(String[] args) {\n if (args.length > 0) {\n TARGET = args[0];\n }\n\n System.out.println(\"PortScanner By Gubatron (May-2005)\");\n System.out.println(\"Scanning Ports On: \" + TARGET + \"n\");\n\n for (int i=21; i <= MAX_PORT; i++) {\n if (PortScanner.THREADS > PortScanner.MAX_THREADS) {\n i--;\n continue;\n }\n\n PortScanner pokie = new PortScanner(i);\n Thread t = new Thread(pokie);\n t.start();\n }\n }\n}\n\n<\/pre>\n","protected":false},"excerpt":{"rendered":"Hi, here’s a simple port scanner I wrote today in Java. I needed to see something on my server, perhaps you can find it useful. I would say its pretty fast, you can tweak the number of threads and timeouts to adjust to your server\/connection. I did’t do much testing on it, just a few […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[33],"tags":[],"class_list":["post-156","post","type-post","status-publish","format-standard","hentry","category-gubatron"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p5Unzf-2w","jetpack-related-posts":[{"id":1269,"url":"https:\/\/www.gubatron.com\/blog\/how-to-make-a-quick-dirty-hexviewer-updated\/","url_meta":{"origin":156,"position":0},"title":"How to make a Quick & Dirty HexViewer – Updated","author":"gubatron","date":"April 20, 2009","format":false,"excerpt":"After I received comments from ispak on Flickr I made a few fixes. ispak pointed out that it was a bad idea reading one byte at the time, also I had a gay ass try\/catch that didn't catch any exception :p So now I read 16 byte chunks, and I\u2026","rel":"","context":"In "Code"","block_context":{"text":"Code","link":"https:\/\/www.gubatron.com\/blog\/category\/code\/"},"img":{"alt_text":"HexViewer - r2","src":"https:\/\/i0.wp.com\/farm4.static.flickr.com\/3486\/3458529439_31357e0afe_o.png?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/farm4.static.flickr.com\/3486\/3458529439_31357e0afe_o.png?resize=350%2C200 1x, https:\/\/i0.wp.com\/farm4.static.flickr.com\/3486\/3458529439_31357e0afe_o.png?resize=525%2C300 1.5x"},"classes":[]},{"id":980,"url":"https:\/\/www.gubatron.com\/blog\/javareflection-notes-invoking-a-static-main-method-from-a-dinamically-loaded-class\/","url_meta":{"origin":156,"position":1},"title":"Java\/Reflection notes: Invoking a static main() method from a dinamically loaded class.","author":"gubatron","date":"November 22, 2008","format":false,"excerpt":"Maybe for some wild reason, your Java application will need to execute a pre launcher that won't know about the Main class it's supposed to invoke until it's being executed. 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You can specify a maximum width (to avoid some really\u2026","rel":"","context":"In \"java\"","block_context":{"text":"java","link":"https:\/\/www.gubatron.com\/blog\/tag\/java\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":2047,"url":"https:\/\/www.gubatron.com\/blog\/map-function-in-java\/","url_meta":{"origin":156,"position":3},"title":"Map function in Java","author":"gubatron","date":"August 31, 2010","format":false,"excerpt":"I read on some email signature something along the lines of: \"If I had a dollar for every for(int i=0; i < size; i++) { ... } I've written I'd be rich\" After coding on Android and learning about some of the tips for performance, like \"With an ArrayList, a\u2026","rel":"","context":"In "Code"","block_context":{"text":"Code","link":"https:\/\/www.gubatron.com\/blog\/category\/code\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":2063,"url":"https:\/\/www.gubatron.com\/blog\/android-programming-how-to-obtain-the-wifis-corresponding-networkinterface\/","url_meta":{"origin":156,"position":4},"title":"Android: How to obtain the WiFi’s corresponding NetworkInterface","author":"gubatron","date":"September 19, 2010","format":false,"excerpt":"Let's say for some odd reason in the world you do need to get the corresponding NetworkInterface object of the Wifi on your android, in my case I needed to have my WiFi device send multicast packets, and I wanted my MulticastSocket to only send packets through the WiFi device\u2026","rel":"","context":"In "Android"","block_context":{"text":"Android","link":"https:\/\/www.gubatron.com\/blog\/category\/android\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1928,"url":"https:\/\/www.gubatron.com\/blog\/droid-vs-nexus-1-who-can-calculate-md5-faster\/","url_meta":{"origin":156,"position":5},"title":"Droid vs Nexus 1: Who can calculate MD5 faster?","author":"gubatron","date":"May 21, 2010","format":false,"excerpt":"Nexus 1 indeed. 17 files get their MD5 calculated on the Droid and 17 files get their MD5 hash calculated on the Nexus 1 Nexus 1 pwns. Here's the code in case you're curious. 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