2 * mount.c -- Linux NFS mount
4 * Copyright (C) 2006 Amit Gud <agud@redhat.com>
6 * - Basic code and wrapper around mount and umount code of NFS.
7 * Based on util-linux/mount/mount.c.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2, or (at your option)
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
23 #include <sys/types.h>
28 #include <sys/mount.h>
35 #include "mount_constants.h"
36 #include "nfs_paths.h"
38 #include "nfs_mount.h"
39 #include "nfs4_mount.h"
40 #include "nfsumount.h"
49 static struct option longopts[] = {
50 { "fake", 0, 0, 'f' },
51 { "help", 0, 0, 'h' },
52 { "no-mtab", 0, 0, 'n' },
53 { "read-only", 0, 0, 'r' },
55 { "verbose", 0, 0, 'v' },
56 { "version", 0, 0, 'V' },
57 { "read-write", 0, 0, 'w' },
59 { "options", 1, 0, 'o' },
60 { "bind", 0, 0, 128 },
61 { "replace", 0, 0, 129 },
62 { "after", 0, 0, 130 },
63 { "before", 0, 0, 131 },
64 { "over", 0, 0, 132 },
65 { "move", 0, 0, 133 },
66 { "rbind", 0, 0, 135 },
70 /* Map from -o and fstab option strings to the flag argument to mount(2). */
72 const char *opt; /* option name */
73 int skip; /* skip in mtab option string */
74 int inv; /* true if flag value should be inverted */
75 int mask; /* flag mask value */
78 /* Custom mount options for our own purposes. */
79 #define MS_DUMMY 0x00000000
80 #define MS_USERS 0x40000000
81 #define MS_USER 0x80000000
83 static const struct opt_map opt_map[] = {
84 { "defaults", 0, 0, 0 }, /* default options */
85 { "ro", 1, 0, MS_RDONLY }, /* read-only */
86 { "rw", 1, 1, MS_RDONLY }, /* read-write */
87 { "exec", 0, 1, MS_NOEXEC }, /* permit execution of binaries */
88 { "noexec", 0, 0, MS_NOEXEC }, /* don't execute binaries */
89 { "suid", 0, 1, MS_NOSUID }, /* honor suid executables */
90 { "nosuid", 0, 0, MS_NOSUID }, /* don't honor suid executables */
91 { "dev", 0, 1, MS_NODEV }, /* interpret device files */
92 { "nodev", 0, 0, MS_NODEV }, /* don't interpret devices */
93 { "sync", 0, 0, MS_SYNCHRONOUS}, /* synchronous I/O */
94 { "async", 0, 1, MS_SYNCHRONOUS}, /* asynchronous I/O */
95 { "dirsync", 0, 0, MS_DIRSYNC}, /* synchronous directory modifications */
96 { "remount", 0, 0, MS_REMOUNT}, /* Alter flags of mounted FS */
97 { "bind", 0, 0, MS_BIND }, /* Remount part of tree elsewhere */
98 { "rbind", 0, 0, MS_BIND|MS_REC }, /* Idem, plus mounted subtrees */
99 { "auto", 0, 0, MS_DUMMY }, /* Can be mounted using -a */
100 { "noauto", 0, 0, MS_DUMMY }, /* Can only be mounted explicitly */
101 { "users", 1, 0, MS_USERS }, /* Allow ordinary user to mount */
102 { "nousers", 0, 1, MS_DUMMY }, /* Forbid ordinary user to mount */
103 { "user", 1, 0, MS_USER }, /* Allow ordinary user to mount */
104 { "nouser", 0, 1, MS_DUMMY }, /* Forbid ordinary user to mount */
105 { "owner", 0, 0, MS_DUMMY }, /* Let the owner of the device mount */
106 { "noowner", 0, 0, MS_DUMMY }, /* Device owner has no special privs */
107 { "group", 0, 0, MS_DUMMY }, /* Let the group of the device mount */
108 { "nogroup", 0, 0, MS_DUMMY }, /* Device group has no special privs */
109 { "_netdev", 0, 0, MS_DUMMY}, /* Device requires network */
110 { "comment", 0, 0, MS_DUMMY}, /* fstab comment only (kudzu,_netdev)*/
112 /* add new options here */
114 { "sub", 0, 1, MS_NOSUB }, /* allow submounts */
115 { "nosub", 0, 0, MS_NOSUB }, /* don't allow submounts */
118 { "quiet", 0, 0, MS_SILENT }, /* be quiet */
119 { "loud", 0, 1, MS_SILENT }, /* print out messages. */
122 { "mand", 0, 0, MS_MANDLOCK }, /* Allow mandatory locks on this FS */
123 { "nomand", 0, 1, MS_MANDLOCK }, /* Forbid mandatory locks on this FS */
125 { "loop", 1, 0, MS_DUMMY }, /* use a loop device */
127 { "atime", 0, 1, MS_NOATIME }, /* Update access time */
128 { "noatime", 0, 0, MS_NOATIME }, /* Do not update access time */
131 { "diratime", 0, 1, MS_NODIRATIME }, /* Update dir access times */
132 { "nodiratime", 0, 0, MS_NODIRATIME },/* Do not update dir access times */
137 /* Try to build a canonical options string. */
138 static char * fix_opts_string (int flags, const char *extra_opts) {
139 const struct opt_map *om;
142 new_opts = xstrdup((flags & MS_RDONLY) ? "ro" : "rw");
143 if (flags & MS_USER) {
144 /* record who mounted this so they can unmount */
145 struct passwd *pw = getpwuid(getuid());
147 new_opts = xstrconcat3(new_opts, ",user=", pw->pw_name);
149 if (flags & MS_USERS)
150 new_opts = xstrconcat3(new_opts, ",users", "");
152 for (om = opt_map; om->opt != NULL; om++) {
155 if (om->inv || !om->mask || (flags & om->mask) != om->mask)
157 new_opts = xstrconcat3(new_opts, ",", om->opt);
160 if (extra_opts && *extra_opts) {
161 new_opts = xstrconcat3(new_opts, ",", extra_opts);
167 int add_mtab(char *fsname, char *mount_point, char *fstype, int flags, char *opts, int freq, int passno)
172 ment.mnt_fsname = fsname;
173 ment.mnt_dir = mount_point;
174 ment.mnt_type = fstype;
175 ment.mnt_opts = fix_opts_string(flags, opts);
179 if(flags & MS_REMOUNT) {
180 update_mtab(ment.mnt_dir, &ment);
186 if ((mtab = setmntent(MOUNTED, "a+")) == NULL) {
188 fprintf(stderr, "Can't open " MOUNTED);
192 if (addmntent(mtab, &ment) == 1) {
195 fprintf(stderr, "Can't write mount entry");
199 if (fchmod(fileno(mtab), 0644) == -1) {
202 fprintf(stderr, "Can't set perms on " MOUNTED);
213 int do_mount_syscall(char *spec, char *node, char *type, int flags, void *data)
215 return mount(spec, node, type, flags, data);
220 printf("usage: %s remotetarget dir [-rvVwfnh] [-o nfsoptions]\n",
222 printf("options:\n");
223 printf("\t-r\t\tMount file system readonly\n");
224 printf("\t-v\t\tVerbose\n");
225 printf("\t-V\t\tPrint version\n");
226 printf("\t-w\t\tMount file system read-write\n");
227 printf("\t-f\t\tFake mount, do not actually mount\n");
228 printf("\t-n\t\tDo not update /etc/mtab\n");
229 printf("\t-s\t\tTolerate sloppy mount options rather than failing.\n");
230 printf("\t-h\t\tPrint this help\n");
231 printf("\tnfsoptions\tRefer to mount.nfs(8) or nfs(5)\n\n");
235 parse_opt(const char *opt, int *mask, char *extra_opts, int len) {
236 const struct opt_map *om;
238 for (om = opt_map; om->opt != NULL; om++) {
239 if (!strcmp (opt, om->opt)) {
248 len -= strlen(extra_opts);
250 if (*extra_opts && --len > 0)
251 strcat(extra_opts, ",");
253 if ((len -= strlen(opt)) > 0)
254 strcat(extra_opts, opt);
257 /* Take -o options list and compute 4th and 5th args to mount(2). flags
258 gets the standard options (indicated by bits) and extra_opts all the rest */
259 static void parse_opts (const char *options, int *flags, char **extra_opts)
261 if (options != NULL) {
262 char *opts = xstrdup(options);
264 int len = strlen(opts) + 1; /* include room for a null */
267 *extra_opts = xmalloc(len);
270 for (p=opts, opt=NULL; p && *p; p++) {
272 opt = p; /* begin of the option item */
274 open_quote ^= 1; /* reverse the status */
276 continue; /* still in a quoted block */
278 *p = '\0'; /* terminate the option item */
279 /* end of option item or last item */
280 if (*p == '\0' || *(p+1) == '\0') {
281 parse_opt(opt, flags, *extra_opts, len);
289 static void mount_error(char *mntpnt, char *node)
293 fprintf(stderr, "%s: mount point %s is not a directory\n",
297 fprintf(stderr, "%s: %s is already mounted or busy\n",
302 fprintf(stderr, "%s: %s failed, reason given by server: %s\n",
303 progname, node, strerror(errno));
305 fprintf(stderr, "%s: mount point %s does not exist\n",
309 fprintf(stderr, "%s: %s\n", progname, strerror(errno));
312 static int chk_mountpoint(char *mount_point)
316 if (stat(mount_point, &sb) < 0){
317 mount_error(mount_point, NULL);
320 if (S_ISDIR(sb.st_mode) == 0){
322 mount_error(mount_point, NULL);
325 if (access(mount_point, X_OK) < 0) {
326 mount_error(mount_point, NULL);
333 extern u_short getport(
334 struct sockaddr_in *saddr,
339 static int probe_statd()
341 struct sockaddr_in addr;
344 memset(&addr, 0, sizeof(addr));
345 addr.sin_family = AF_INET;
346 addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
347 port = getport(&addr, 100024, 1, IPPROTO_UDP);
351 addr.sin_port = htons(port);
353 if (clnt_ping(&addr, 100024, 1, IPPROTO_UDP, NULL) <= 0)
359 static int start_statd()
361 /* If /var/run/rpc.statd.pid exists and is non-empty,
362 * assume statd already running.
363 * If START_STATD not defined, or defined to a non-existent file,
365 * else run that file (typically a shell script)
372 if (stat(START_STATD, &stb) ==0 &&
373 S_ISREG(stb.st_mode) &&
374 (stb.st_mode & S_IXUSR)) {
383 int main(int argc, char *argv[])
385 int c, flags = 0, mnt_err = 1, fake = 0;
386 char *spec, *mount_point, *fs_type = "nfs";
387 char *extra_opts = NULL, *mount_opts = NULL;
388 uid_t uid = getuid();
390 progname = basename(argv[0]);
392 if(!strncmp(progname, "umount", strlen("umount"))) {
397 exit(nfsumount(argc, argv));
400 if(argv[1] && argv[1][0] == '-') {
401 if(argv[1][1] == 'V')
402 printf("%s ("PACKAGE_STRING")\n", progname);
414 mount_point = argv[2];
416 argv[2] = argv[0]; /* so that getopt error messages are correct */
417 while ((c = getopt_long(argc - 2, argv + 2, "rvVwfno:hs",
418 longopts, NULL)) != -1) {
427 printf("%s: ("PACKAGE_STRING")\n", progname);
438 case 'o': /* specify mount options */
440 mount_opts = xstrconcat3(mount_opts, ",", optarg);
442 mount_opts = xstrdup(optarg);
450 case 129: /* replace */
451 mounttype = MS_REPLACE;
453 case 130: /* after */
454 mounttype = MS_AFTER;
456 case 131: /* before */
457 mounttype = MS_BEFORE;
465 case 135: /* rbind */
466 mounttype = MS_BIND | MS_REC;
474 if (optind != argc-2) {
475 /* Extra non-option words at the end... */
480 if (strcmp(progname, "mount.nfs4") == 0)
484 * If a non-root user is attempting to mount, make sure the
485 * user's requested options match the options specified in
486 * /etc/fstab; otherwise, don't allow the mount.
489 struct mntentchn *mc;
491 if ((mc = getfsfile(mount_point)) == NULL ||
492 strcmp(mc->m.mnt_fsname, spec) != 0 ||
493 strcmp(mc->m.mnt_type, fs_type) != 0) {
494 fprintf(stderr, "%s: permission denied: no match for %s "
495 "found in /etc/fstab\n", progname, mount_point);
500 * 'mount' munges the options from fstab before passing them
501 * to us, so it is non-trivial to test that we have the correct
502 * set of options and we don't want to trust what the user
503 * gave us, so just take whatever is in /etc/fstab.
505 mount_opts = strdup(mc->m.mnt_opts);
509 mount_point = canonicalize(mount_point);
510 if (mount_point == NULL ||
511 mount_point[0] != '/') {
512 fprintf(stderr, "%s: unknown mount point %s\n",
513 progname, mount_point ? : "");
517 parse_opts(mount_opts, &flags, &extra_opts);
520 if (! (flags & (MS_USERS | MS_USER))) {
521 fprintf(stderr, "%s: permission denied\n", progname);
526 if (chk_mountpoint(mount_point))
529 if (strcmp(fs_type, "nfs4") == 0)
530 mnt_err = nfs4mount(spec, mount_point, &flags, &extra_opts, &mount_opts, 0);
533 mnt_err = nfsmount(spec, mount_point, &flags,
534 &extra_opts, &mount_opts,
536 if (!mnt_err && !fake && need_statd) {
537 if (!start_statd()) {
539 "%s: rpc.statd is not running but is "
540 "required for remote locking\n"
541 " Either use \"-o nolocks\" to keep "
542 "locks local, or start statd.\n",
553 mnt_err = do_mount_syscall(spec, mount_point, fs_type,
554 flags & ~(MS_USER|MS_USERS) ,
558 mount_error(mount_point, spec);
564 add_mtab(spec, mount_point, fs_type,
565 flags, extra_opts, 0, 0);