basic-proxy/main.c

#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <stdlib.h>
#include "easysock.h"
void forward_data(int from_fd, int to_fd) {
	int n = 0;
        char* buffer = malloc(3000*sizeof(char));
	while ((n = recv(from_fd, buffer, 3000, 0)) > 0) { // read data from input socket
        	send(to_fd, buffer, n, 0); // send data to output socket
	}
}

int main() {

	int preferred_network = 4;
	char preferred_transport = 'T';
	struct sockaddr addr_struct;
	int server_sock = create_local(preferred_network,preferred_transport,"127.0.0.1",3000,&addr_struct);
	int addrlen = sizeof(addr_struct);

	listen(server_sock,50);  /* Arbitrary number, change later */

	while (1) {
	int from_client = accept(server_sock,&addr_struct,(socklen_t *)&addrlen);	
	int to_server = create_remote(preferred_network,preferred_transport,"127.0.0.1",5000);
	
	if (fork() == 0) {

	/* fork returns 0 for a child, so we're in the child's execution
	   right now */
		close(server_sock);
		if (fork() == 0) {
			forward_data(from_client,to_server);
			exit(0);
		}
		if (fork() == 0) {
			forward_data(to_server,from_client);
			exit(0);
		}
		exit(0);


	}
//	recv(from_client,buffer,3000,0);
			

//	printf("%s",buffer);
	

	}

}