source: branches/samba-3.0/source/client/smbmnt.c@ 206

Last change on this file since 206 was 1, checked in by Paul Smedley, 18 years ago

Initial code import
File size: 8.2 KB
Line 
1/*
2 * smbmnt.c
3 *
4 * Copyright (C) 1995-1998 by Paal-Kr. Engstad and Volker Lendecke
5 * extensively modified by Tridge
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 *
21 */
22
23#define SMBMOUNT_MALLOC 1
24
25#include "includes.h"
26
27#include <mntent.h>
28#include <sys/utsname.h>
29
30#include <asm/types.h>
31#include <asm/posix_types.h>
32#include <linux/smb.h>
33#include <linux/smb_mount.h>
34#include <asm/unistd.h>
35
36#ifndef MS_MGC_VAL
37/* This may look strange but MS_MGC_VAL is what we are looking for and
38 is what we need from <linux/fs.h> under libc systems and is
39 provided in standard includes on glibc systems. So... We
40 switch on what we need... */
41#include <linux/fs.h>
42#endif
43
44static uid_t mount_uid;
45static gid_t mount_gid;
46static int mount_ro;
47static unsigned mount_fmask;
48static unsigned mount_dmask;
49static int user_mount;
50static char *options;
51
52static void
53help(void)
54{
55 printf("\n");
56 printf("Usage: smbmnt mount-point [options]\n");
57 printf("Version %s\n\n",SAMBA_VERSION_STRING);
58 printf("-s share share name on server\n"
59 "-r mount read-only\n"
60 "-u uid mount as uid\n"
61 "-g gid mount as gid\n"
62 "-f mask permission mask for files\n"
63 "-d mask permission mask for directories\n"
64 "-o options name=value, list of options\n"
65 "-h print this help text\n");
66}
67
68static int
69parse_args(int argc, char *argv[], struct smb_mount_data *data, char **share)
70{
71 int opt;
72
73 while ((opt = getopt (argc, argv, "s:u:g:rf:d:o:")) != EOF)
74 {
75 switch (opt)
76 {
77 case 's':
78 *share = optarg;
79 break;
80 case 'u':
81 if (!user_mount) {
82 mount_uid = strtol(optarg, NULL, 0);
83 }
84 break;
85 case 'g':
86 if (!user_mount) {
87 mount_gid = strtol(optarg, NULL, 0);
88 }
89 break;
90 case 'r':
91 mount_ro = 1;
92 break;
93 case 'f':
94 mount_fmask = strtol(optarg, NULL, 8);
95 break;
96 case 'd':
97 mount_dmask = strtol(optarg, NULL, 8);
98 break;
99 case 'o':
100 options = optarg;
101 break;
102 default:
103 return -1;
104 }
105 }
106 return 0;
107
108}
109
110static char *
111fullpath(const char *p)
112{
113 char path[PATH_MAX+1];
114
115 if (strlen(p) > PATH_MAX) {
116 return NULL;
117 }
118
119 if (realpath(p, path) == NULL) {
120 fprintf(stderr,"Failed to find real path for mount point %s: %s\n",
121 p, strerror(errno));
122 exit(1);
123 }
124 return strdup(path);
125}
126
127/* Check whether user is allowed to mount on the specified mount point. If it's
128 OK then we change into that directory - this prevents race conditions */
129static int mount_ok(char *mount_point)
130{
131 struct stat st;
132
133 if (chdir(mount_point) != 0) {
134 return -1;
135 }
136
137 if (stat(".", &st) != 0) {
138 return -1;
139 }
140
141 if (!S_ISDIR(st.st_mode)) {
142 errno = ENOTDIR;
143 return -1;
144 }
145
146 if ((getuid() != 0) &&
147 ((getuid() != st.st_uid) ||
148 ((st.st_mode & S_IRWXU) != S_IRWXU))) {
149 errno = EPERM;
150 return -1;
151 }
152
153 return 0;
154}
155
156/* Tries to mount using the appropriate format. For 2.2 the struct,
157 for 2.4 the ascii version. */
158static int
159do_mount(char *share_name, unsigned int flags, struct smb_mount_data *data)
160{
161 pstring opts;
162 struct utsname uts;
163 char *release, *major, *minor;
164 char *data1, *data2;
165
166 uname(&uts);
167 release = uts.release;
168 major = strtok(release, ".");
169 minor = strtok(NULL, ".");
170 if (major && minor && atoi(major) == 2 && atoi(minor) < 4) {
171 /* < 2.4, assume struct */
172 data1 = (char *) data;
173 data2 = opts;
174 } else {
175 /* >= 2.4, assume ascii but fall back on struct */
176 data1 = opts;
177 data2 = (char *) data;
178 }
179
180 slprintf(opts, sizeof(opts)-1,
181 "version=7,uid=%d,gid=%d,file_mode=0%o,dir_mode=0%o,%s",
182 mount_uid, mount_gid, data->file_mode, data->dir_mode,options);
183 if (mount(share_name, ".", "smbfs", flags, data1) == 0)
184 return 0;
185 return mount(share_name, ".", "smbfs", flags, data2);
186}
187
188 int main(int argc, char *argv[])
189{
190 char *mount_point, *share_name = NULL;
191 FILE *mtab;
192 int fd;
193 unsigned int flags;
194 struct smb_mount_data data;
195 struct mntent ment;
196
197 memset(&data, 0, sizeof(struct smb_mount_data));
198
199 if (argc < 2) {
200 help();
201 exit(1);
202 }
203
204 if (argv[1][0] == '-') {
205 help();
206 exit(1);
207 }
208
209 if (getuid() != 0) {
210 user_mount = 1;
211 }
212
213 if (geteuid() != 0) {
214 fprintf(stderr, "smbmnt must be installed suid root for direct user mounts (%d,%d)\n", getuid(), geteuid());
215 exit(1);
216 }
217
218 mount_uid = getuid();
219 mount_gid = getgid();
220 mount_fmask = umask(0);
221 umask(mount_fmask);
222 mount_fmask = ~mount_fmask;
223
224 mount_point = fullpath(argv[1]);
225
226 argv += 1;
227 argc -= 1;
228
229 if (mount_ok(mount_point) != 0) {
230 fprintf(stderr, "cannot mount on %s: %s\n",
231 mount_point, strerror(errno));
232 exit(1);
233 }
234
235 data.version = SMB_MOUNT_VERSION;
236
237 /* getuid() gives us the real uid, who may umount the fs */
238 data.mounted_uid = getuid();
239
240 if (parse_args(argc, argv, &data, &share_name) != 0) {
241 help();
242 return -1;
243 }
244
245 data.uid = mount_uid; // truncates to 16-bits here!!!
246 data.gid = mount_gid;
247 data.file_mode = (S_IRWXU|S_IRWXG|S_IRWXO) & mount_fmask;
248 data.dir_mode = (S_IRWXU|S_IRWXG|S_IRWXO) & mount_dmask;
249
250 if (mount_dmask == 0) {
251 data.dir_mode = data.file_mode;
252 if ((data.dir_mode & S_IRUSR) != 0)
253 data.dir_mode |= S_IXUSR;
254 if ((data.dir_mode & S_IRGRP) != 0)
255 data.dir_mode |= S_IXGRP;
256 if ((data.dir_mode & S_IROTH) != 0)
257 data.dir_mode |= S_IXOTH;
258 }
259
260 flags = MS_MGC_VAL | MS_NOSUID | MS_NODEV;
261
262 if (mount_ro) flags |= MS_RDONLY;
263
264 if (do_mount(share_name, flags, &data) < 0) {
265 switch (errno) {
266 case ENODEV:
267 fprintf(stderr, "ERROR: smbfs filesystem not supported by the kernel\n");
268 break;
269 default:
270 perror("mount error");
271 }
272 fprintf(stderr, "Please refer to the smbmnt(8) manual page\n");
273 return -1;
274 }
275
276 ment.mnt_fsname = share_name ? share_name : "none";
277 ment.mnt_dir = mount_point;
278 ment.mnt_type = "smbfs";
279 ment.mnt_opts = "";
280 ment.mnt_freq = 0;
281 ment.mnt_passno= 0;
282
283 mount_point = ment.mnt_dir;
284
285 if (mount_point == NULL)
286 {
287 fprintf(stderr, "Mount point too long\n");
288 return -1;
289 }
290
291 if ((fd = open(MOUNTED"~", O_RDWR|O_CREAT|O_EXCL, 0600)) == -1)
292 {
293 fprintf(stderr, "Can't get "MOUNTED"~ lock file");
294 return 1;
295 }
296 close(fd);
297
298 if ((mtab = setmntent(MOUNTED, "a+")) == NULL)
299 {
300 fprintf(stderr, "Can't open " MOUNTED);
301 return 1;
302 }
303
304 if (addmntent(mtab, &ment) == 1)
305 {
306 fprintf(stderr, "Can't write mount entry");
307 return 1;
308 }
309 if (fchmod(fileno(mtab), 0644) == -1)
310 {
311 fprintf(stderr, "Can't set perms on "MOUNTED);
312 return 1;
313 }
314 endmntent(mtab);
315
316 if (unlink(MOUNTED"~") == -1)
317 {
318 fprintf(stderr, "Can't remove "MOUNTED"~");
319 return 1;
320 }
321
322 return 0;
323}
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