#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
#include <signal.h>
#include <stdbool.h>
#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <fcntl.h>


bool shouldrun = true;
int fd = -1;

void sighand(int sig) {
	shouldrun = false;
	close(fd);
}

int main(int argc, char** argv) {


	int port = 2223;

	if(argc < 2) {
		fprintf(stderr, "Usage: %s <logfile> [port]", argv[0]);
		return 1;
	}

	char* logfile = argv[1];

	if(argc > 2) {
		port = atoi(argv[2]);
	}

	//create socket
	fd = socket(AF_INET, SOCK_STREAM, 0);
	if(fd < 0) {
		fprintf(stderr, "could not create socket\n");
		return 1;
	}

	//ignore errors
	setsockopt(fd, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &(int){1}, sizeof(int));

	struct sockaddr_in bindaddr;
	bindaddr.sin_family = AF_INET;
	bindaddr.sin_addr.s_addr = INADDR_ANY;
	bindaddr.sin_port = htons( port );
	if(bind(fd, &bindaddr, sizeof(struct sockaddr_in))) {
		fprintf(stderr, "Bind failed\n");
		return 1;
	}

	if(listen(fd, 5)) {
		fprintf(stderr, "listen failed\n");
		return 1;
	}

	signal(SIGINT, sighand);

	while(shouldrun) {
		struct sockaddr_in clientaddr;
		socklen_t caddrlen = 0;
		int client = accept(fd, (struct sockaddr *)&clientaddr, (socklen_t*)&caddrlen);
		if(client < 0) {
			fprintf(stderr, "accept failed\n");
			continue;
		}

		//open THE file
		int file = open(logfile, O_RDONLY);
		if(file < 0) {
			fprintf(stderr, "Cannot open logfile\n");
			close(client);
			continue;
		}

		//jump to the end
		lseek(file, -sizeof(time_t), SEEK_END);

		//read
		time_t data;
		size_t readc = read(file, &data, sizeof(time_t));
		if(readc != sizeof(time_t)) {
			fprintf(stderr, "could not read logfile\n");
			close(file);
			close(client);
			continue;
		}

		size_t writec = write(client, &data, sizeof(time_t));
		if(writec != sizeof(time_t)) {
			fprintf(stderr, "could not read logfile\n");
		}

		close(file);
		close(client);
	}

	return 0;
}