Small exercise: Using sockets for communication between Linux and Windows

In daily life, the majority of people use the machine is generally the Windows system, but for developers, development, compilation and other work is often built on the Linux machine. In fact, Linux, Unix, and WindowsServer occupy a large portion of the market in terms of servers, and in supercomputers, Linux replaces Unix as the first operating system.

Communication is a computer and operating system of a large task, through the FTP, ping, ssh and other ways, people can easily connect with the server. A large network of two programs through a two-way communication connection to achieve the exchange of data, one end of this connection is called a socket. The Windows system uses a Windows socket, while Linux uses a POSIX socket. Today combined with some classic online routines, a simple socket code was written to enable the communication between Ubuntu (virtual machine) and Windows.

Implementation code for the client under the Windows platform:

#include <stdio.h>#include <Windows.h>#pragma comment (lib, "Ws2_32.lib")#define Port#define IP_Address "172.30.70.95"intMainintargcChar* argv[])//ARGC is the total number of arguments on the command line{Wsadata s;//used to store the Windows Sockets initialization information returned by calling the AfxSocketInit global functionSOCKET Clientsocket;structSockaddr_in clientaddr;//A sockaddr_in-type structural body Object        intRET =0;CharSendbuffer[max_path];//Windows MAX_PATH default is 260        //Initialize Windows Sockets        The //WSAStartup function initializes the Winsock service        if(WSAStartup (Makeword (2,2), &s)! =0)//By connecting two given unsigned parameters, the first parameter is a low byte{printf("Init Windows Socket failed! Error:%d\n ", GetLastError ()); GetChar ();return-1; } while(1)        {//Create a set of interfaces        //If such a socket is connected to a specified port with connect ()        //The datagram can be sent and received with Send () and recv () and the port        //When the session ends, call Closesocket ()Clientsocket = socket (Af_inet,//Support ARPA Internet address format onlySock_stream,//Type description of the new set of interfacesIPPROTO_TCP);//protocol used by the socket interface        if(Clientsocket = = Invalid_socket) {printf(the Create Socket failed! Error:%d\n ", GetLastError ()); GetChar ();return-1;        } clientaddr.sin_family = Af_inet; CLIENTADDR.SIN_ADDR.S_ADDR = inet_addr (ip_address);//define IP addressClientaddr.sin_port = htons (port);//Convert unsigned short shaping of the host to network byte order        memset(Clientaddr.sin_zero,0x00,8);the//function usually initializes the newly requested memory        //Connect socketret = Connect (Clientsocket, (structsockaddr*) &clientaddr,sizeof(CLIENTADDR));if(ret = = socket_error) {printf("Socket Connect failed! error:%d\n ", GetLastError ()); GetChar ();return-1; }Else{printf("Socket Connect succeed!"); }printf("Input Data:"); while(1)        {scanf('%s ', &sendbuffer);//Send data to serverret = Send (Clientsocket, Sendbuffer, (int)strlen(Sendbuffer),//Return send buffer data length                0);if(ret = = socket_error) {printf("Send Information failed! error:%d\n ", GetLastError ()); GetChar (); Break; } Break; }//Close socketClosesocket (Clientsocket);if(sendbuffer[0] ==' Q ')//Set the input to exit when the first character is Q{printf("quit!\n"); Break;                    }} wsacleanup (); GetChar ();return 0;}

My Linux (Ubuntu) side Network information:

Server code under the Linux (Ubuntu) platform:

#include <unistd.h>#include <stdio.h>#include <i386-linux-gnu/sys/socket.h>#include <netinet/in.h>#include <i386-linux-gnu/sys/types.h>#include <stdlib.h>#include <string.h>#define SERVER_PORT#define Length_of_listen_queue#define Buffer_sizeintMain ()//(int argc, char* argv[]){structSockaddr_in server_addr;intServer_socket;intopt =1; Bzero (&AMP;SERVER_ADDR,sizeof(SERVER_ADDR));//byte string before n bytes is 0, including ' + 'server_addr.sin_family = af_inet; SERVER_ADDR.SIN_ADDR.S_ADDR = htons (Inaddr_any);//Turn to the small end, Inaddr_any is the address assigned to address 0.0.0.0Server_addr.sin_port = htons (Server_port);//Create a socketServer_socket = socket (pf_inet, Sock_stream,0);if(Server_socket <0)    {printf("Create Socket failed!\n");Exit(1); }//bind a socketSetSockOpt (Server_socket, Sol_socket, SO_REUSEADDR, &opt,sizeof(opt));if(Bind (Server_socket, (structsockaddr*) &server_addr,sizeof(SERVER_ADDR))) {printf("Server Bind Port:%d failed!\n", Server_port);Exit(1); }//Monitor socket    if(Listen (Server_socket, Length_of_listen_queue)) {printf("Server Listen failed!\n");Exit(1); } while(1)    {structSockaddr_in client_addr;intClient_socket; socklen_t length;CharBuffer[buffer_size];//Connect client socketLength =sizeof(CLIENT_ADDR); Client_socket = Accept (Server_socket, (structsockaddr*) &client_addr, &length);if(Client_socket <0)        {printf("Server Accept failed!\n"); Break; }//Receive data from the client         while(1) {bzero (Buffer, buffer_size); Length = recv (Client_socket, Buffer, Buffer_size,0);if(Length <0)            {printf("Server recieve Data failed!\n"); Break; }if(' Q '= = buffer[0])            {printf("quit!\n"); Break; }printf("%s\n", Buffer); Break;    } close (Client_socket); } close (Server_socket);return 0;}

When the client is opened, the server side must ensure that it is listening, or the connection fails:

Open the server-side program as follows:

Data transfer success:

This little experiment only took a little time to debug, and only one-way send data, single-function, purely a small exercise, socket programming debugging, mainly focus on the error value returned when the program error, which often can quickly find the code of vulnerability.

Reference Link: http://blog.csdn.net/feixiaoxing/article/details/8567162

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Small exercise: Using sockets for communication between Linux and Windows