/*
 * Copyright (C) 2014-2017 Firejail Authors
 *
 * This file is part of firejail project
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "firejail.h"
#include <sys/mount.h>
#include <sys/stat.h>

static int tmpfs_mounted = 0;

// build /run/firejail directory
void preproc_build_firejail_dir(void) {
	struct stat s;

	// CentOS 6 doesn't have /run directory
	if (stat(RUN_FIREJAIL_BASEDIR, &s)) {
		create_empty_dir_as_root(RUN_FIREJAIL_BASEDIR, 0755);
	}

	if (stat(RUN_FIREJAIL_DIR, &s)) {
		create_empty_dir_as_root(RUN_FIREJAIL_DIR, 0755);
	}
	
	if (stat(RUN_FIREJAIL_NETWORK_DIR, &s)) {
		create_empty_dir_as_root(RUN_FIREJAIL_NETWORK_DIR, 0755);
	}
	
	if (stat(RUN_FIREJAIL_BANDWIDTH_DIR, &s)) {
		create_empty_dir_as_root(RUN_FIREJAIL_BANDWIDTH_DIR, 0755);
	}
		
	if (stat(RUN_FIREJAIL_NAME_DIR, &s)) {
		create_empty_dir_as_root(RUN_FIREJAIL_NAME_DIR, 0755);
	}
	
	if (stat(RUN_FIREJAIL_X11_DIR, &s)) {
		create_empty_dir_as_root(RUN_FIREJAIL_X11_DIR, 0755);
	}
	
	if (stat(RUN_FIREJAIL_APPIMAGE_DIR, &s)) {
		create_empty_dir_as_root(RUN_FIREJAIL_APPIMAGE_DIR, 0755);
	}
	
	if (stat(RUN_MNT_DIR, &s)) {
		create_empty_dir_as_root(RUN_MNT_DIR, 0755);
	}

	create_empty_file_as_root(RUN_RO_FILE, S_IRUSR);
	create_empty_dir_as_root(RUN_RO_DIR, S_IRUSR);
}

// build /run/firejail/mnt directory
void preproc_mount_mnt_dir(void) {
	// mount tmpfs on top of /run/firejail/mnt
	if (!tmpfs_mounted) {
		if (arg_debug)
			printf("Mounting tmpfs on %s directory\n", RUN_MNT_DIR);
		if (mount("tmpfs", RUN_MNT_DIR, "tmpfs", MS_NOSUID | MS_STRICTATIME | MS_REC,  "mode=755,gid=0") < 0)
			errExit("mounting /run/firejail/mnt");
		tmpfs_mounted = 1;
		fs_logger2("tmpfs", RUN_MNT_DIR);
		
		//copy defaultl seccomp files
		copy_file(PATH_SECCOMP_I386, RUN_SECCOMP_I386, getuid(), getgid(), 0644); // root needed
		copy_file(PATH_SECCOMP_AMD64, RUN_SECCOMP_AMD64, getuid(), getgid(), 0644); // root needed
		if (arg_allow_debuggers)
			copy_file(PATH_SECCOMP_DEFAULT_DEBUG, RUN_SECCOMP_CFG, getuid(), getgid(), 0644); // root needed
		else
			copy_file(PATH_SECCOMP_DEFAULT, RUN_SECCOMP_CFG, getuid(), getgid(), 0644); // root needed
			
		// as root, create an empty RUN_SECCOMP_PROTOCOL file
		create_empty_file_as_root(RUN_SECCOMP_PROTOCOL, 0644);
		if (set_perms(RUN_SECCOMP_PROTOCOL, getuid(), getgid(), 0644))
			errExit("set_perms");
	}
}