4 * Copyright (C) 1995-1998 by Volker Lendecke
8 #define SMBMOUNT_MALLOC 1
14 #include <asm/types.h>
15 #include <asm/posix_types.h>
16 #include <linux/smb.h>
17 #include <linux/smb_mount.h>
18 #include <linux/smb_fs.h>
20 /* This is a (hopefully) temporary hack due to the fact that
21 sizeof( uid_t ) != sizeof( __kernel_uid_t ) under glibc.
22 This may change in the future and smb.h may get fixed in the
23 future. In the mean time, it's ugly hack time - get over it.
25 #undef SMB_IOC_GETMOUNTUID
26 #define SMB_IOC_GETMOUNTUID _IOR('u', 1, __kernel_uid_t)
29 #define O_NOFOLLOW 0400000
35 printf("usage: smbumount mountpoint\n");
39 umount_ok(const char *mount_point)
41 /* we set O_NOFOLLOW to prevent users playing games with symlinks to
42 umount filesystems they don't own */
43 int fid = open(mount_point, O_RDONLY|O_NOFOLLOW, 0);
44 __kernel_uid32_t mount_uid;
47 fprintf(stderr, "Could not open %s: %s\n",
48 mount_point, strerror(errno));
52 if (ioctl(fid, SMB_IOC_GETMOUNTUID32, &mount_uid) != 0) {
53 __kernel_uid_t mount_uid16;
54 if (ioctl(fid, SMB_IOC_GETMOUNTUID, &mount_uid16) != 0) {
55 fprintf(stderr, "%s probably not smb-filesystem\n",
59 mount_uid = mount_uid16;
63 && (mount_uid != getuid())) {
64 fprintf(stderr, "You are not allowed to umount %s\n",
73 /* Make a canonical pathname from PATH. Returns a freshly malloced string.
74 It is up the *caller* to ensure that the PATH is sensible. i.e.
75 canonicalize ("/dev/fd0/.") returns "/dev/fd0" even though ``/dev/fd0/.''
76 is not a legal pathname for ``/dev/fd0'' Anything we cannot parse
77 we return unmodified. */
79 canonicalize (char *path)
81 char *canonical = malloc (PATH_MAX + 1);
84 fprintf(stderr, "Error! Not enough memory!\n");
88 if (strlen(path) > PATH_MAX) {
89 fprintf(stderr, "Mount point string too long\n");
96 if (realpath (path, canonical))
99 strncpy (canonical, path, PATH_MAX);
100 canonical[PATH_MAX] = '\0';
106 main(int argc, char *argv[])
119 if (geteuid() != 0) {
120 fprintf(stderr, "smbumount must be installed suid root\n");
124 mount_point = canonicalize(argv[1]);
126 if (mount_point == NULL)
131 if (umount_ok(mount_point) != 0) {
135 if (umount(mount_point) != 0) {
136 fprintf(stderr, "Could not umount %s: %s\n",
137 mount_point, strerror(errno));
141 if ((fd = open(MOUNTED"~", O_RDWR|O_CREAT|O_EXCL, 0600)) == -1)
143 fprintf(stderr, "Can't get "MOUNTED"~ lock file");
148 if ((mtab = setmntent(MOUNTED, "r")) == NULL) {
149 fprintf(stderr, "Can't open " MOUNTED ": %s\n",
154 #define MOUNTED_TMP MOUNTED".tmp"
156 if ((new_mtab = setmntent(MOUNTED_TMP, "w")) == NULL) {
157 fprintf(stderr, "Can't open " MOUNTED_TMP ": %s\n",
163 while ((mnt = getmntent(mtab)) != NULL) {
164 if (strcmp(mnt->mnt_dir, mount_point) != 0) {
165 addmntent(new_mtab, mnt);
171 if (fchmod (fileno (new_mtab), S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH) < 0) {
172 fprintf(stderr, "Error changing mode of %s: %s\n",
173 MOUNTED_TMP, strerror(errno));
179 if (rename(MOUNTED_TMP, MOUNTED) < 0) {
180 fprintf(stderr, "Cannot rename %s to %s: %s\n",
181 MOUNTED, MOUNTED_TMP, strerror(errno));
185 if (unlink(MOUNTED"~") == -1)
187 fprintf(stderr, "Can't remove "MOUNTED"~");