#include <sys/socket.h>
#include <stdlib.h>
#include <signal.h>
#include <unistd.h>
#include <stdio.h>
#include <err.h>

#include "tunnel.h"
#include "macro.h"

static void sighandler(int signo __unused)
{
	unlink(TUNNEL_SOCK_PATH);
	exit(EXIT_FAILURE);
}

static void tunnel_daemon_loop(int sock)
{
	for (;;) {
		int fd = accept(sock, NULL, NULL);
		if (fd < 0) {
			warn("accept");
			continue;
		}

		FILE *fp = fdopen(fd, "w");
		if (fp) {
			fprintf(fp, "hello from %d", getpid());
			fclose(fp);
		}
	}
}

int tunnel_daemon(int sock)
{
	switch (fork()) {
	case -1:
		warn("fork");
		return -1;
	case 0:
		break;
	default:
		return 0;
	}

	if (setsid() < 0)
		err(EXIT_FAILURE, "setsid");

	chdir("/");

	struct sigaction sa = {
		.sa_handler = sighandler
	};

	sigaction(SIGTERM, &sa, NULL);
	sigaction(SIGINT, &sa, NULL);

#if 0
	int fd = open("/dev/null", O_RDWR);
	if (fd < 0)
		err(EXIT_FAILURE, "open /dev/null");

	dup2(fd, STDIN_FILENO);
	dup2(fd, STDOUT_FILENO);
	dup2(fd, STDERR_FILENO);

	if (fd > 2)
		close(fd);
#endif

	tunnel_daemon_loop(sock);

	return 0;
}