4 * Copyright (C) 1995-1998 by Volker Lendecke
12 #include <asm/types.h>
13 #include <asm/posix_types.h>
14 #include <linux/smb.h>
15 #include <linux/smb_mount.h>
16 #include <linux/smb_fs.h>
18 /* This is a (hopefully) temporary hack due to the fact that
19 sizeof( uid_t ) != sizeof( __kernel_uid_t ) under glibc.
20 This may change in the future and smb.h may get fixed in the
21 future. In the mean time, it's ugly hack time - get over it.
23 #undef SMB_IOC_GETMOUNTUID
24 #define SMB_IOC_GETMOUNTUID _IOR('u', 1, __kernel_uid_t)
27 #define O_NOFOLLOW 0400000
33 printf("usage: smbumount mountpoint\n");
37 umount_ok(const char *mount_point)
39 /* we set O_NOFOLLOW to prevent users playing games with symlinks to
40 umount filesystems they don't own */
41 int fid = open(mount_point, O_RDONLY|O_NOFOLLOW, 0);
42 __kernel_uid_t mount_uid;
45 fprintf(stderr, "Could not open %s: %s\n",
46 mount_point, strerror(errno));
50 if (ioctl(fid, SMB_IOC_GETMOUNTUID, &mount_uid) != 0) {
51 fprintf(stderr, "%s probably not smb-filesystem\n",
57 && (mount_uid != getuid())) {
58 fprintf(stderr, "You are not allowed to umount %s\n",
67 /* Make a canonical pathname from PATH. Returns a freshly malloced string.
68 It is up the *caller* to ensure that the PATH is sensible. i.e.
69 canonicalize ("/dev/fd0/.") returns "/dev/fd0" even though ``/dev/fd0/.''
70 is not a legal pathname for ``/dev/fd0'' Anything we cannot parse
71 we return unmodified. */
73 canonicalize (char *path)
75 char *canonical = malloc (PATH_MAX + 1);
78 fprintf(stderr, "Error! Not enough memory!\n");
82 if (strlen(path) > PATH_MAX) {
83 fprintf(stderr, "Mount point string too long\n");
90 if (realpath (path, canonical))
93 strncpy (canonical, path, PATH_MAX);
94 canonical[PATH_MAX] = '\0';
100 main(int argc, char *argv[])
113 if (geteuid() != 0) {
114 fprintf(stderr, "smbumount must be installed suid root\n");
118 mount_point = canonicalize(argv[1]);
120 if (mount_point == NULL)
125 if (umount_ok(mount_point) != 0) {
129 if (umount(mount_point) != 0) {
130 fprintf(stderr, "Could not umount %s: %s\n",
131 mount_point, strerror(errno));
135 if ((fd = open(MOUNTED"~", O_RDWR|O_CREAT|O_EXCL, 0600)) == -1)
137 fprintf(stderr, "Can't get "MOUNTED"~ lock file");
142 if ((mtab = setmntent(MOUNTED, "r")) == NULL) {
143 fprintf(stderr, "Can't open " MOUNTED ": %s\n",
148 #define MOUNTED_TMP MOUNTED".tmp"
150 if ((new_mtab = setmntent(MOUNTED_TMP, "w")) == NULL) {
151 fprintf(stderr, "Can't open " MOUNTED_TMP ": %s\n",
157 while ((mnt = getmntent(mtab)) != NULL) {
158 if (strcmp(mnt->mnt_dir, mount_point) != 0) {
159 addmntent(new_mtab, mnt);
165 if (fchmod (fileno (new_mtab), S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH) < 0) {
166 fprintf(stderr, "Error changing mode of %s: %s\n",
167 MOUNTED_TMP, strerror(errno));
173 if (rename(MOUNTED_TMP, MOUNTED) < 0) {
174 fprintf(stderr, "Cannot rename %s to %s: %s\n",
175 MOUNTED, MOUNTED_TMP, strerror(errno));
179 if (unlink(MOUNTED"~") == -1)
181 fprintf(stderr, "Can't remove "MOUNTED"~");