/*
Posluša na TCP vratih 6969, prejme eno povezavo, vsako sekundo nanjo izpiše LF in piše statistiko, dobljeno iz jedrnega modula tcp_times.
*/
#include <stdint.h>
#include "tcp_times.h"
#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <unistd.h>
#include <stdbool.h>
#include <sys/ioctl.h>
#include <fcntl.h>
int main (void) {
	int tcp_socket = socket(AF_INET6, SOCK_STREAM, 0);
	if (tcp_socket == -1) {
		perror("socket");
		return 1;
	}
	struct sockaddr_in6 sa6 = {
		.sin6_family = AF_INET6,
		.sin6_port = htons(6969),
		.sin6_addr = IN6ADDR_ANY_INIT,
	};
	if (bind(tcp_socket, (struct sockaddr *) &sa6, sizeof sa6) == -1) {
		perror("bind");
		return 1;
	}
	if (listen(tcp_socket, 1 /* only one client is handled*/) == -1) {
		perror("listen");
		return 1;
	}
	int flow = accept(tcp_socket, NULL, NULL);
	if (flow == -1) {
		perror("accept");
		return 1;
	}
	int tcp_times = open("/proc/tcp_times", O_RDWR);
	struct tcp_times tt = {
		.fd = flow,
	};
	char buf = '\n';
	while (true) {
		if (ioctl(tcp_times, 0, &tt) == -1) {
			perror("ioctl");
			return 1;
		}
		printf(TCP_TIMES_PRINTF_FORMAT "\n", TCP_TIMES_PRINTF_VARIABLES(tt.));
		if (send(flow, &buf, 1, MSG_NOSIGNAL) == -1) {
			perror("write");
			return 1;
		}
		sleep(1);
	}
}