/*------------------------------------------------------------------------
* main - TCP client for ECHO service
*------------------------------------------------------------------------
*/
int
main(int argc, char *argv[])
{
char *host = "localhost"; /* host to use if none supplied */
char *portnum = "5004"; /* default server port number */
/* SSL initializations */
SSL_CTX *ctx;
/* Load encryption & hashing algorithms for the SSL program */
SSL_library_init();
/* Create and load ctx struct to authenticate server certificate */
ctx = create_CTX_to_authenticate();
switch (argc) {
case 1:
host = "localhost";
break;
case 3:
host = argv[2];
/* FALL THROUGH */
case 2:
portnum = argv[1];
break;
default:
fprintf(stderr, "usage: TCPecho [host [port]]\n");
exit(1);
}
TCPecho(host, portnum, ctx);
exit(0);
}
/*------------------------------------------------------------------------
* main - TCP client for ECHO service
*------------------------------------------------------------------------
*/
void main(int argc, char *argv[])
{
char firstHost[15] = "192.168.40.50"; //Defines the first host to check if it is running a server application.
char *host = firstHost; //Sets a pointer equal to the host, for manipulation and function passing purposes.
char *service = "echo"; //Defines the service. This will use echo.
WSADATA wsadata; //Used to initialize WinSock2 and open sockets
SetConsoleTitle(L"Client End"); // Sets the title of the application.
if (WSAStartup(WSVERS, &wsadata) != 0) // Attempts to start WSA, if failed, it will pull an error code. If it doesn't fail, it returns 0.
{
errexit("WSAStartup failed\n"); // If failed, prints it fails, and shuts down WinSock2. It fails whenever the program is already open. It protects against initializing twice.
}
printf("Searching for server on 192.168.xxx.xxx\n"); // Starts searching on the private network.
TCPecho(host, service); //Function initializer, with the initial host, and the service type.
WSACleanup(); // Closes all open sockets and shuts down WinSock2.
exit(0); // Exits the program.
}
/*------------------------------------------------------------------------
* main - TCP client for ECHO service
*------------------------------------------------------------------------
*/
int
main(int argc, char *argv[])
{
char *destination;
int portN;
if (argc==3)
{
destination = argv[1];
portN = atoi(argv[2]);
}
else usage(argv[0]);
TCPecho(destination, portN);
exit(0);
}
/*------------------------------------------------------------------------
* main - TCP client for ECHO service
*------------------------------------------------------------------------
*/
int
main(int argc, char *argv[])
{
char *host = "localhost"; /* host to use if none supplied */
char *service = "echo"; /* default service name */
switch (argc) {
case 1:
break;
case 3:
service = argv[2];
/* FALL THROUGH */
case 2:
host = argv[1];
break;
default:
fprintf(stderr, "usage: TCPecho [host [port]]\n");
exit(1);
}
signal(SIGPIPE, SIG_IGN);
TCPecho(host, service);
exit(0);
}
/*------------------------------------------------------------------------
* main - TCP client for ECHO service
*------------------------------------------------------------------------
*/
int
main(int argc, char *argv[])
{
char *host = "localhost"; /* host to use if none supplied */
char *portnum = "5004"; /* default server port number */
switch (argc) {
case 1:
host = "localhost";
break;
case 3:
host = argv[2];
/* FALL THROUGH */
case 2:
portnum = argv[1];
break;
default:
fprintf(stderr, "usage: TCPecho [host [port]]\n");
exit(1);
}
TCPecho(host, portnum);
exit(0);
}
