mirror of
https://git.code.sf.net/p/ntfs-3g/ntfs-3g.git
synced 2024-11-23 18:14:24 +08:00
30ae872b89
Both fusermount.c and mount_util.c use _PATH_MOUNTED, so they should include <paths.h>, which provides this definition. This is required for building with the musl C library. Contributed by Thomas Petazzoni
477 lines
12 KiB
C
477 lines
12 KiB
C
/*
|
|
FUSE: Filesystem in Userspace
|
|
Copyright (C) 2001-2007 Miklos Szeredi <miklos@szeredi.hu>
|
|
|
|
This program can be distributed under the terms of the GNU LGPLv2.
|
|
See the file COPYING.LIB.
|
|
*/
|
|
|
|
#include "config.h"
|
|
#include "mount_util.h"
|
|
#include <stdio.h>
|
|
#include <unistd.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <dirent.h>
|
|
#include <errno.h>
|
|
#include <limits.h>
|
|
#include <paths.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/wait.h>
|
|
#ifdef __SOLARIS__
|
|
#else /* __SOLARIS__ */
|
|
#include <mntent.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/param.h>
|
|
#endif /* __SOLARIS__ */
|
|
|
|
#ifdef __SOLARIS__
|
|
|
|
char *mkdtemp(char *template);
|
|
|
|
#ifndef _PATH_MOUNTED
|
|
#define _PATH_MOUNTED "/etc/mnttab"
|
|
#endif /* _PATH_MOUNTED */
|
|
|
|
#ifndef IGNORE_MTAB
|
|
static int mtab_needs_update(const char *mnt)
|
|
{
|
|
struct stat stbuf;
|
|
|
|
/* If mtab is within new mount, don't touch it */
|
|
if (strncmp(mnt, _PATH_MOUNTED, strlen(mnt)) == 0 &&
|
|
_PATH_MOUNTED[strlen(mnt)] == '/')
|
|
return 0;
|
|
|
|
if (lstat(_PATH_MOUNTED, &stbuf) != -1 && S_ISLNK(stbuf.st_mode))
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
#endif /* IGNORE_MTAB */
|
|
|
|
int fuse_mnt_add_mount(const char *progname, const char *fsname,
|
|
const char *mnt, const char *type, const char *opts)
|
|
{
|
|
int res;
|
|
int status;
|
|
|
|
#ifndef IGNORE_MTAB
|
|
if (!mtab_needs_update(mnt))
|
|
return 0;
|
|
#endif /* IGNORE_MTAB */
|
|
|
|
res = fork();
|
|
if (res == -1) {
|
|
fprintf(stderr, "%s: fork: %s\n", progname, strerror(errno));
|
|
return -1;
|
|
}
|
|
if (res == 0) {
|
|
char *env = NULL;
|
|
char templ[] = "/tmp/fusermountXXXXXX";
|
|
char *tmp;
|
|
|
|
setuid(geteuid());
|
|
|
|
/*
|
|
* hide in a directory, where mount isn't able to resolve
|
|
* fsname as a valid path
|
|
*/
|
|
tmp = mkdtemp(templ);
|
|
if (!tmp) {
|
|
fprintf(stderr, "%s: failed to create temporary directory\n",
|
|
progname);
|
|
exit(1);
|
|
}
|
|
if (chdir(tmp)) {
|
|
fprintf(stderr, "%s: failed to chdir to %s: %s\n",
|
|
progname, tmp, strerror(errno));
|
|
exit(1);
|
|
}
|
|
rmdir(tmp);
|
|
execle("/sbin/mount", "/sbin/mount", "-F", type, "-o", opts,
|
|
fsname, mnt, NULL, &env);
|
|
fprintf(stderr, "%s: failed to execute /sbin/mount: %s\n", progname,
|
|
strerror(errno));
|
|
exit(1);
|
|
}
|
|
res = waitpid(res, &status, 0);
|
|
if (res == -1) {
|
|
fprintf(stderr, "%s: waitpid: %s\n", progname, strerror(errno));
|
|
return -1;
|
|
}
|
|
if (status != 0)
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int fuse_mnt_umount(const char *progname, const char *mnt, int lazy)
|
|
{
|
|
int res;
|
|
int status;
|
|
|
|
#ifndef IGNORE_MTAB
|
|
if (!mtab_needs_update(mnt))
|
|
return 0;
|
|
#endif /* IGNORE_MTAB */
|
|
|
|
res = fork();
|
|
if (res == -1) {
|
|
fprintf(stderr, "%s: fork: %s\n", progname, strerror(errno));
|
|
return -1;
|
|
}
|
|
if (res == 0) {
|
|
char *env = NULL;
|
|
|
|
setuid(geteuid());
|
|
if (lazy) {
|
|
execle("/sbin/umount", "/sbin/umount", mnt,
|
|
NULL, &env);
|
|
} else {
|
|
execle("/sbin/umount", "/sbin/umount", "-f", mnt,
|
|
NULL, &env);
|
|
}
|
|
fprintf(stderr, "%s: failed to execute /sbin/umount: %s\n", progname,
|
|
strerror(errno));
|
|
exit(1);
|
|
}
|
|
res = waitpid(res, &status, 0);
|
|
if (res == -1) {
|
|
fprintf(stderr, "%s: waitpid: %s\n", progname, strerror(errno));
|
|
return -1;
|
|
}
|
|
if (status != 0)
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
char *fuse_mnt_resolve_path(const char *progname, const char *orig)
|
|
{
|
|
char buf[PATH_MAX];
|
|
char *copy;
|
|
char *dst;
|
|
char *end;
|
|
char *lastcomp;
|
|
const char *toresolv;
|
|
|
|
if (!orig[0]) {
|
|
fprintf(stderr, "%s: invalid mountpoint '%s'\n", progname, orig);
|
|
return NULL;
|
|
}
|
|
|
|
copy = strdup(orig);
|
|
if (copy == NULL) {
|
|
fprintf(stderr, "%s: failed to allocate memory\n", progname);
|
|
return NULL;
|
|
}
|
|
|
|
toresolv = copy;
|
|
lastcomp = NULL;
|
|
for (end = copy + strlen(copy) - 1; end > copy && *end == '/'; end --);
|
|
if (end[0] != '/') {
|
|
char *tmp;
|
|
end[1] = '\0';
|
|
tmp = strrchr(copy, '/');
|
|
if (tmp == NULL) {
|
|
lastcomp = copy;
|
|
toresolv = ".";
|
|
} else {
|
|
lastcomp = tmp + 1;
|
|
if (tmp == copy)
|
|
toresolv = "/";
|
|
}
|
|
if (strcmp(lastcomp, ".") == 0 || strcmp(lastcomp, "..") == 0) {
|
|
lastcomp = NULL;
|
|
toresolv = copy;
|
|
}
|
|
else if (tmp)
|
|
tmp[0] = '\0';
|
|
}
|
|
if (realpath(toresolv, buf) == NULL) {
|
|
fprintf(stderr, "%s: bad mount point %s: %s\n", progname, orig,
|
|
strerror(errno));
|
|
free(copy);
|
|
return NULL;
|
|
}
|
|
if (lastcomp == NULL)
|
|
dst = strdup(buf);
|
|
else {
|
|
dst = (char *) malloc(strlen(buf) + 1 + strlen(lastcomp) + 1);
|
|
if (dst) {
|
|
unsigned buflen = strlen(buf);
|
|
if (buflen && buf[buflen-1] == '/')
|
|
sprintf(dst, "%s%s", buf, lastcomp);
|
|
else
|
|
sprintf(dst, "%s/%s", buf, lastcomp);
|
|
}
|
|
}
|
|
free(copy);
|
|
if (dst == NULL)
|
|
fprintf(stderr, "%s: failed to allocate memory\n", progname);
|
|
return dst;
|
|
}
|
|
|
|
int fuse_mnt_check_empty(const char *progname, const char *mnt,
|
|
mode_t rootmode, off_t rootsize)
|
|
{
|
|
int isempty = 1;
|
|
|
|
if (S_ISDIR(rootmode)) {
|
|
struct dirent *ent;
|
|
DIR *dp = opendir(mnt);
|
|
if (dp == NULL) {
|
|
fprintf(stderr, "%s: failed to open mountpoint for reading: %s\n",
|
|
progname, strerror(errno));
|
|
return -1;
|
|
}
|
|
while ((ent = readdir(dp)) != NULL) {
|
|
if (strcmp(ent->d_name, ".") != 0 &&
|
|
strcmp(ent->d_name, "..") != 0) {
|
|
isempty = 0;
|
|
break;
|
|
}
|
|
}
|
|
closedir(dp);
|
|
} else if (rootsize)
|
|
isempty = 0;
|
|
|
|
if (!isempty) {
|
|
fprintf(stderr, "%s: mountpoint is not empty\n", progname);
|
|
fprintf(stderr, "%s: if you are sure this is safe, use the 'nonempty' mount option\n", progname);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int fuse_mnt_check_fuseblk(void)
|
|
{
|
|
char buf[256];
|
|
FILE *f = fopen("/proc/filesystems", "r");
|
|
if (!f)
|
|
return 1;
|
|
|
|
while (fgets(buf, sizeof(buf), f))
|
|
if (strstr(buf, "fuseblk\n")) {
|
|
fclose(f);
|
|
return 1;
|
|
}
|
|
|
|
fclose(f);
|
|
return 0;
|
|
}
|
|
|
|
#else /* __SOLARIS__ */
|
|
|
|
static int mtab_needs_update(const char *mnt)
|
|
{
|
|
int res;
|
|
struct stat stbuf;
|
|
|
|
/* If mtab is within new mount, don't touch it */
|
|
if (strncmp(mnt, _PATH_MOUNTED, strlen(mnt)) == 0 &&
|
|
_PATH_MOUNTED[strlen(mnt)] == '/')
|
|
return 0;
|
|
|
|
/*
|
|
* Skip mtab update if /etc/mtab:
|
|
*
|
|
* - doesn't exist,
|
|
* - is a symlink,
|
|
* - is on a read-only filesystem.
|
|
*/
|
|
res = lstat(_PATH_MOUNTED, &stbuf);
|
|
if (res == -1) {
|
|
if (errno == ENOENT)
|
|
return 0;
|
|
} else {
|
|
if (S_ISLNK(stbuf.st_mode))
|
|
return 0;
|
|
|
|
res = access(_PATH_MOUNTED, W_OK);
|
|
if (res == -1 && errno == EROFS)
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
int fuse_mnt_add_mount(const char *progname, const char *fsname,
|
|
const char *mnt, const char *type, const char *opts)
|
|
{
|
|
int res;
|
|
|
|
if (!mtab_needs_update(mnt))
|
|
return 0;
|
|
|
|
res = fork();
|
|
if (res == -1) {
|
|
fprintf(stderr, "%s: fork: %s\n", progname, strerror(errno));
|
|
return 0;
|
|
}
|
|
if (res == 0) {
|
|
char *env = NULL;
|
|
char templ[] = "/tmp/fusermountXXXXXX";
|
|
char *tmp;
|
|
|
|
if (setuid(geteuid()))
|
|
fprintf(stderr, "%s: failed to setuid : %s\n", progname,
|
|
strerror(errno));
|
|
|
|
/*
|
|
* hide in a directory, where mount isn't able to resolve
|
|
* fsname as a valid path
|
|
*/
|
|
tmp = mkdtemp(templ);
|
|
if (!tmp) {
|
|
fprintf(stderr, "%s: failed to create temporary directory\n",
|
|
progname);
|
|
exit(1);
|
|
}
|
|
if (chdir(tmp)) {
|
|
fprintf(stderr, "%s: failed to chdir to %s: %s\n",
|
|
progname, tmp, strerror(errno));
|
|
exit(1);
|
|
}
|
|
rmdir(tmp);
|
|
execle("/bin/mount", "/bin/mount", "-i", "-f", "-t", type, "-o", opts,
|
|
fsname, mnt, NULL, &env);
|
|
fprintf(stderr, "%s: failed to execute /bin/mount: %s\n", progname,
|
|
strerror(errno));
|
|
exit(1);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int fuse_mnt_umount(const char *progname, const char *mnt, int lazy)
|
|
{
|
|
int res;
|
|
int status;
|
|
|
|
if (!mtab_needs_update(mnt)) {
|
|
res = umount2(mnt, lazy ? 2 : 0);
|
|
if (res == -1)
|
|
fprintf(stderr, "%s: failed to unmount %s: %s\n", progname,
|
|
mnt, strerror(errno));
|
|
return res;
|
|
}
|
|
|
|
res = fork();
|
|
if (res == -1) {
|
|
fprintf(stderr, "%s: fork: %s\n", progname, strerror(errno));
|
|
return -1;
|
|
}
|
|
if (res == 0) {
|
|
char *env = NULL;
|
|
|
|
if (setuid(geteuid()))
|
|
fprintf(stderr, "%s: failed to setuid : %s\n", progname,
|
|
strerror(errno));
|
|
if (lazy) {
|
|
execle("/bin/umount", "/bin/umount", "-i", mnt, "-l",
|
|
NULL, &env);
|
|
} else {
|
|
execle("/bin/umount", "/bin/umount", "-i", mnt,
|
|
NULL, &env);
|
|
}
|
|
fprintf(stderr, "%s: failed to execute /bin/umount: %s\n", progname,
|
|
strerror(errno));
|
|
exit(1);
|
|
}
|
|
res = waitpid(res, &status, 0);
|
|
if (res == -1) {
|
|
fprintf(stderr, "%s: waitpid: %s\n", progname, strerror(errno));
|
|
return -1;
|
|
}
|
|
if (status != 0)
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
char *fuse_mnt_resolve_path(const char *progname, const char *orig)
|
|
{
|
|
char buf[PATH_MAX];
|
|
char *copy;
|
|
char *dst;
|
|
char *end;
|
|
char *lastcomp;
|
|
const char *toresolv;
|
|
|
|
if (!orig[0]) {
|
|
fprintf(stderr, "%s: invalid mountpoint '%s'\n", progname, orig);
|
|
return NULL;
|
|
}
|
|
|
|
copy = strdup(orig);
|
|
if (copy == NULL) {
|
|
fprintf(stderr, "%s: failed to allocate memory\n", progname);
|
|
return NULL;
|
|
}
|
|
|
|
toresolv = copy;
|
|
lastcomp = NULL;
|
|
for (end = copy + strlen(copy) - 1; end > copy && *end == '/'; end --);
|
|
if (end[0] != '/') {
|
|
char *tmp;
|
|
end[1] = '\0';
|
|
tmp = strrchr(copy, '/');
|
|
if (tmp == NULL) {
|
|
lastcomp = copy;
|
|
toresolv = ".";
|
|
} else {
|
|
lastcomp = tmp + 1;
|
|
if (tmp == copy)
|
|
toresolv = "/";
|
|
}
|
|
if (strcmp(lastcomp, ".") == 0 || strcmp(lastcomp, "..") == 0) {
|
|
lastcomp = NULL;
|
|
toresolv = copy;
|
|
}
|
|
else if (tmp)
|
|
tmp[0] = '\0';
|
|
}
|
|
if (realpath(toresolv, buf) == NULL) {
|
|
fprintf(stderr, "%s: bad mount point %s: %s\n", progname, orig,
|
|
strerror(errno));
|
|
free(copy);
|
|
return NULL;
|
|
}
|
|
if (lastcomp == NULL)
|
|
dst = strdup(buf);
|
|
else {
|
|
dst = (char *) malloc(strlen(buf) + 1 + strlen(lastcomp) + 1);
|
|
if (dst) {
|
|
unsigned buflen = strlen(buf);
|
|
if (buflen && buf[buflen-1] == '/')
|
|
sprintf(dst, "%s%s", buf, lastcomp);
|
|
else
|
|
sprintf(dst, "%s/%s", buf, lastcomp);
|
|
}
|
|
}
|
|
free(copy);
|
|
if (dst == NULL)
|
|
fprintf(stderr, "%s: failed to allocate memory\n", progname);
|
|
return dst;
|
|
}
|
|
|
|
int fuse_mnt_check_fuseblk(void)
|
|
{
|
|
char buf[256];
|
|
FILE *f = fopen("/proc/filesystems", "r");
|
|
if (!f)
|
|
return 1;
|
|
|
|
while (fgets(buf, sizeof(buf), f))
|
|
if (strstr(buf, "fuseblk\n")) {
|
|
fclose(f);
|
|
return 1;
|
|
}
|
|
|
|
fclose(f);
|
|
return 0;
|
|
}
|
|
|
|
#endif /* __SOLARIS__ */
|