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/*
* Copyright (C) 2014-2016 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.
*/
// http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=770fe30a46a12b6fb6b63fbe1737654d28e84844
// sudo mount -o loop krita-3.0-x86_64.appimage mnt
#include "firejail.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mount.h>
#include <fcntl.h>
#include <linux/loop.h>
#include <errno.h>
static char *devloop = NULL; // device file
static char *mntdir = NULL; // mount point in /tmp directory
const char *appimage_getdir(void) {
return mntdir;
}
void appimage_set(const char *appimage_path) {
assert(appimage_path);
assert(devloop == NULL); // don't call this twice!
EUID_ASSERT();
// check appimage_path
if (access(appimage_path, R_OK) == -1) {
fprintf(stderr, "Error: cannot access AppImage file\n");
exit(1);
}
// open as user to prevent race condition
int ffd = open(appimage_path, O_RDONLY|O_CLOEXEC);
if (ffd == -1)
errExit("open");
EUID_ROOT();
// find or allocate a free loop device to use
int cfd = open("/dev/loop-control", O_RDWR);
int devnr = ioctl(cfd, LOOP_CTL_GET_FREE);
if (devnr == -1) {
fprintf(stderr, "Error: cannot allocate a new loopback device\n");
exit(1);
}
close(cfd);
if (asprintf(&devloop, "/dev/loop%d", devnr) == -1)
errExit("asprintf");
int lfd = open(devloop, O_RDONLY);
if (ioctl(lfd, LOOP_SET_FD, ffd) == -1) {
fprintf(stderr, "Error: cannot configure the loopback device\n");
exit(1);
}
close(lfd);
close(ffd);
EUID_USER();
// creates directory with perms 0700
char dirname[] = "/tmp/firejail-mnt-XXXXXX";
mntdir = strdup(mkdtemp(dirname));
if (mntdir == NULL) {
fprintf(stderr, "Error: cannot create temporary directory\n");
exit(1);
}
if (chmod(mntdir, 0700) == -1)
errExit("chmod");
ASSERT_PERMS(mntdir, getuid(), getgid(), 0700);
char *mode;
if (asprintf(&mode, "mode=700,uid=%d,gid=%d", getuid(), getgid()) == -1)
errExit("asprintf");
EUID_ROOT();
if (mount(devloop, mntdir, "iso9660",MS_MGC_VAL|MS_RDONLY, mode) < 0)
errExit("mounting appimage");
if (arg_debug)
printf("appimage mounted on %s\n", mntdir);
EUID_USER();
if (appimage_path && setenv("APPIMAGE", appimage_path, 1) < 0)
errExit("setenv");
if (mntdir && setenv("APPDIR", mntdir, 1) < 0)
errExit("setenv");
// build new command line
if (asprintf(&cfg.command_line, "%s/AppRun", mntdir) == -1)
errExit("asprintf");
free(mode);
}
void appimage_clear(void) {
int rv;
if (mntdir) {
rv = umount2(mntdir, MNT_FORCE);
if (rv == -1 && errno == EBUSY) {
sleep(1);
rv = umount2(mntdir, MNT_FORCE);
(void) rv;
}
rmdir(mntdir);
free(mntdir);
}
if (devloop) {
int lfd = open(devloop, O_RDONLY);
rv = ioctl(lfd, LOOP_CLR_FD, 0);
(void) rv;
close(lfd);
}
}
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