4 * Copyright (C) 1995-1998 by Paal-Kr. Engstad and Volker Lendecke
5 * extensively modified by Tridge
12 #include <sys/utsname.h>
14 #include <asm/types.h>
15 #include <asm/posix_types.h>
16 #include <linux/smb.h>
17 #include <linux/smb_mount.h>
18 #include <asm/unistd.h>
21 /* This may look strange but MS_MGC_VAL is what we are looking for and
22 is what we need from <linux/fs.h> under libc systems and is
23 provided in standard includes on glibc systems. So... We
24 switch on what we need... */
28 static uid_t mount_uid;
29 static gid_t mount_gid;
31 static unsigned mount_fmask;
32 static unsigned mount_dmask;
33 static int user_mount;
40 printf("Usage: smbmnt mount-point [options]\n");
41 printf("Version %s\n\n",VERSION);
42 printf("-s share share name on server\n"
43 "-r mount read-only\n"
44 "-u uid mount as uid\n"
45 "-g gid mount as gid\n"
46 "-f mask permission mask for files\n"
47 "-d mask permission mask for directories\n"
48 "-o options name=value, list of options\n"
49 "-h print this help text\n");
53 parse_args(int argc, char *argv[], struct smb_mount_data *data, char **share)
57 while ((opt = getopt (argc, argv, "s:u:g:rf:d:o:")) != EOF)
66 mount_uid = strtol(optarg, NULL, 0);
71 mount_gid = strtol(optarg, NULL, 0);
78 mount_fmask = strtol(optarg, NULL, 8);
81 mount_dmask = strtol(optarg, NULL, 8);
95 fullpath(const char *p)
97 char path[MAXPATHLEN];
99 if (strlen(p) > MAXPATHLEN-1) {
103 if (realpath(p, path) == NULL) {
104 fprintf(stderr,"Failed to find real path for mount point\n");
110 /* Check whether user is allowed to mount on the specified mount point. If it's
111 OK then we change into that directory - this prevents race conditions */
112 static int mount_ok(char *mount_point)
116 if (chdir(mount_point) != 0) {
120 if (stat(".", &st) != 0) {
124 if (!S_ISDIR(st.st_mode)) {
129 if ((getuid() != 0) &&
130 ((getuid() != st.st_uid) ||
131 ((st.st_mode & S_IRWXU) != S_IRWXU))) {
139 /* Tries to mount using the appropriate format. For 2.2 the struct,
140 for 2.4 the ascii version. */
142 do_mount(char *share_name, unsigned int flags, struct smb_mount_data *data)
146 char *release, *major, *minor;
150 release = uts.release;
151 major = strsep(&release, ".");
152 minor = strsep(&release, ".");
153 if (major && minor && atoi(major) == 2 && atoi(minor) < 4) {
154 /* < 2.4, assume struct */
155 data1 = (char *) data;
158 /* >= 2.4, assume ascii but fall back on struct */
160 data2 = (char *) data;
163 slprintf(opts, sizeof(opts)-1,
164 "version=7,uid=%d,gid=%d,file_mode=0%o,dir_mode=0%o,%s",
165 data->uid, data->gid, data->file_mode, data->dir_mode,options);
166 if (mount(share_name, ".", "smbfs", flags, data1) == 0)
168 return mount(share_name, ".", "smbfs", flags, data2);
171 int main(int argc, char *argv[])
173 char *mount_point, *share_name = NULL;
177 struct smb_mount_data data;
180 memset(&data, 0, sizeof(struct smb_mount_data));
187 if (argv[1][0] == '-') {
196 if (geteuid() != 0) {
197 fprintf(stderr, "smbmnt must be installed suid root for direct user mounts (%d,%d)\n", getuid(), geteuid());
201 mount_uid = getuid();
202 mount_gid = getgid();
203 mount_fmask = umask(0);
205 mount_fmask = ~mount_fmask;
207 mount_point = fullpath(argv[1]);
212 if (mount_ok(mount_point) != 0) {
213 fprintf(stderr, "cannot mount on %s: %s\n",
214 mount_point, strerror(errno));
218 data.version = SMB_MOUNT_VERSION;
220 /* getuid() gives us the real uid, who may umount the fs */
221 data.mounted_uid = getuid();
223 if (parse_args(argc, argv, &data, &share_name) != 0) {
228 data.uid = mount_uid;
229 data.gid = mount_gid;
230 data.file_mode = (S_IRWXU|S_IRWXG|S_IRWXO) & mount_fmask;
231 data.dir_mode = (S_IRWXU|S_IRWXG|S_IRWXO) & mount_dmask;
233 if (mount_dmask == 0) {
234 data.dir_mode = data.file_mode;
235 if ((data.dir_mode & S_IRUSR) != 0)
236 data.dir_mode |= S_IXUSR;
237 if ((data.dir_mode & S_IRGRP) != 0)
238 data.dir_mode |= S_IXGRP;
239 if ((data.dir_mode & S_IROTH) != 0)
240 data.dir_mode |= S_IXOTH;
245 if (mount_ro) flags |= MS_RDONLY;
247 if (do_mount(share_name, flags, &data) < 0) {
250 fprintf(stderr, "ERROR: smbfs filesystem not supported by the kernel\n");
253 perror("mount error");
255 fprintf(stderr, "Please refer to the smbmnt(8) manual page\n");
259 ment.mnt_fsname = share_name ? share_name : "none";
260 ment.mnt_dir = mount_point;
261 ment.mnt_type = "smbfs";
266 mount_point = ment.mnt_dir;
268 if (mount_point == NULL)
270 fprintf(stderr, "Mount point too long\n");
274 if ((fd = open(MOUNTED"~", O_RDWR|O_CREAT|O_EXCL, 0600)) == -1)
276 fprintf(stderr, "Can't get "MOUNTED"~ lock file");
281 if ((mtab = setmntent(MOUNTED, "a+")) == NULL)
283 fprintf(stderr, "Can't open " MOUNTED);
287 if (addmntent(mtab, &ment) == 1)
289 fprintf(stderr, "Can't write mount entry");
292 if (fchmod(fileno(mtab), 0644) == -1)
294 fprintf(stderr, "Can't set perms on "MOUNTED);
299 if (unlink(MOUNTED"~") == -1)
301 fprintf(stderr, "Can't remove "MOUNTED"~");