Thread: UDP Server -> Displaying Client Information

Hi, I have a UDP server which a client can send messages to.

I want the UDP server to be able to output the address and the port number of the client that sent the data.

Any idea how this can be achieved?

Thank you,
-Mark

You can use something like this:

Code:

#include <winsock.h>

void yourfunction(void)
{
  HOSTENT *hostent;
  char *remotehost;

  /*...some code here..*/

  hostent = gethostbyname(remotehost);

  /*...and more code here...*/
}

It will retrieve the address. Not sure what to do for the port. I'm not familiar with UDP though, just TCP.

Would you mind e-mailing me winsock.h, please? I'm trying to do something similar using DJGPP and I don't have that header file. I can't find it for download anywhere either. My address is dragoon_42 "AT" hotmail.com

Windows Sockets.

DJGPP is a dos compiler. There are plenty of free windows compilers around.

Does anyone know of a solution to my problem?

The part of the code where my client sends data is:

Code:

	buffer = gets(buffer);
	printf("Read in %s\n", buffer);
	sendto(clientSocket, buffer, strlen(buffer) + 1, 0, (struct sockaddr *) &connectTo, sizeof(struct sockaddr_in));

And for the Server receiving the data:

Code:

	while(buffer != "QUIT") {
		result = recvfrom(serverSocket, buffer, sizeof(buffer), 0, 0, 0);
		if (result > 0) {
			printf(">> %s\n", buffer);
		}
	}

I figured it out eventually. If anyone is interested:

Code:

	while ((strcmp (buffer, "QUIT")) != 0) {
		result = recvfrom(serverSocket, buffer, sizeof(buffer), 0, (struct sockaddr*) &clientInformation, &clientSize);
		if (result > 0) {
			buffer[result] = '\0';
			printf("%s:%d >> %s\n", inet_ntoa(clientInformation.sin_addr), ntohs(clientInformation.sin_port), buffer);
		}
	}