tcp udp port scan

IntroductionThe purpose of this project is to implement the function of transferring a file between different hosts through network connections between two applications. The two applications should use UDP and TCP Protocols respectively to transmit at least 1 MB of files.Implementation and descriptionSource code Both applications are implemented by a single program with source code. Description The program

The principle is very simple, just as the reply is also said to be based on the Connect () function return value: Then the teacher said, this is full connection, cannot scan UDP port bar. Well, I forgot what I said later. In this way, the reply will be finished. Actually didn't ask what, hehe. So easy. And then stick to my code, in fact, according to the online i

TCP (Transmission Control Protocol): connection-oriented, unreliable, and data stream service. UDP (User datainprotocl User Datagram Protocol): For connectionless, unreliable, and datagram services. TCP transmission is different from UDP transmission. TCP transmission is s

Recently, the network protocols have been a learning, macro-awareness of the harvest.The network is divided into the physical layer, the data link layer, the network layer, the transport layer, the conversation layer, the presentation layer and the application layer. ReferenceThe IP protocol corresponds to the network layer,The TCP/UDP protocol corresponds to the transport layer,The HTTP protocol correspond

]) Iflen ( Add_port) >0andlen (less_port) >0:msg= "%sport%snewopen \t%shaveclose\n "% (i,add_port,less_port) print Msgr_log (msg) Eliflen (add_port) >0:msg= " %sport%snewopen\n "% (i,add_port) printmsgr_log (msg) elif len (Less_port) >0:msg= "%sport%sclose\n" % (I,less_ Port) Printmsgr_log (msg) else:print "%sportnochange:%s,%s" % (I,a[i],b[i]) set_info (i,s[i][' TCP '].keys ()) else:msg= "newhost:% Sport%

() + "Scan thread for port");}LOGLIST.ITEMS.ADD ("End Thread:" +port.) ToString ());Asyncopsaredone.close ();}Else{Try{TcpClient TCP = new TcpClient ();Tcp. Connect (Scanhost,port);If a connection error is established, the follow

Prior to implementing the Java version of the TCP and UDP socket programming example, so decided to combine Python learning to do a python version of the socket programming experiment.The process is as follows:1. A client reads a line of characters from its standard input (keyboard) and sends the line to the server through its sockets.2. The server reads a line of characters from its connection socket.3. Th

Protocol common services have DNS, SNMP, QQ and so on. For QQ must also explain that QQ2003 used to only use the UDP protocol, its server uses 8000 ports, listen to whether there is information, the client uses 4000 ports, Send out information (this is also not difficult to understand in the general IP version of the QQ display of the friend's IP address information in the port is often 4000 or its subsequ

{scoket. close () ;}} finally {S. close ();}}} Public class tcpclient {/*** @ Param ARGs * @ throws ioexception */public static void main (string [] ARGs) throws ioexception {inetaddress = inetaddress. getbyname (null); system. out. println ("inetaddress:" + inetaddress); Socket socket = new socket (inetaddress, tcpserver. port); system. out. println ("socket:" + socket); try {bufferedreader in = new bufferedreader (New inputstreamreader (socket. get

One, TCP sockets1. Low version TCP socketsServer-Side Client　　　　2, improved version of TCP socketsServer-Side Client　　　Two, the UDP socketServer Client　　Note: A UDP socket can support simultaneous access by multiple clients, but TCP