//This is server socket for networking connections //Uses for text messaging between client and server via TCP #include #include #include #include #include #include short socketCreate (void); int bindSocket (short hSocket); void errorDisplay (char *msg); int main() { short hSocket =0, sock=0; // Descriptor for socket socklen_t clientLen= 0; struct sockaddr_in client ={0}; //struct defined in headers, which storing our server adress char client_message[200] = {'\0'}; char message[101]={'\0'}; hSocket = socketCreate(); bindSocket(hSocket); if (listen(hSocket,10)<0){ errorDisplay("Can't listen"); exit (-3); } printf ("\nWaiting for incoming connection "); while (1){ printf ("."); sock=accept (hSocket,(struct sockaddr*)&client,&clientLen); if (sock<0){ errorDisplay("Can't accept connection"); exit (-4); } printf("\nConnection is created"); if (recv(sock,client_message,200,0)<0){ errorDisplay("Can't recive message"); exit (-5); } printf ("\n Client message is: %s", client_message); printf("\nInput your message: "); fgets (message,100,stdin); if (send (sock,message,strlen(message),0)<0){ errorDisplay("Can't send message"); exit (-5); } close (sock); sleep (0.5); } return 0; } //Creating socket for server short socketCreate (void) { short hSocket = 0; hSocket = socket(AF_INET,SOCK_STREAM,0); if (hSocket<0){ char *msg = "ERROR Can't create socket"; errorDisplay (msg); exit (-1); } printf ("\n Server is created!"); return hSocket; } //Displaying any error void errorDisplay (char *msg) { perror (msg); } //binding fucntion int bindSocket (short hSocket) { int result = 0; int clientPort =12345; struct sockaddr_in serv_addr = {0}; serv_addr.sin_family = AF_INET; serv_addr.sin_port = htons (clientPort); serv_addr.sin_addr.s_addr = htonl(INADDR_ANY); result=bind(hSocket,(struct sockaddr*)&serv_addr,sizeof(serv_addr)); if (result <0){ char *msg = "ERROR Can't bind socket"; errorDisplay (msg); exit (-2); } printf ("\n Socket is binded!\n"); return 0; }

ServerTCP