/* vi: set sw=4 ts=4: */ /* * Mini mount implementation for busybox * * Copyright (C) 1995, 1996 by Bruce Perens . * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * 3/21/1999 Charles P. Wright * searches through fstab when -a is passed * will try mounting stuff with all fses when passed -t auto * * 1999-04-17 Dave Cinege...Rewrote -t auto. Fixed ro mtab. * * 1999-10-07 Erik Andersen , . * Rewrite of a lot of code. Removed mtab usage (I plan on * putting it back as a compile-time option some time), * major adjustments to option parsing, and some serious * dieting all around. * * 1999-11-06 mtab suppport is back - andersee * * 2000-01-12 Ben Collins , Borrowed utils-linux's * mount to add loop support. * * 2000-04-30 Dave Cinege * Rewrote fstab while loop and lower mount section. Can now do * single mounts from fstab. Can override fstab options for single * mount. Common mount_one call for single mounts and 'all'. Fixed * mtab updating and stale entries. Removed 'remount' default. * */ #include #include #include #include #include #include #include #include #include "busybox.h" #if defined BB_FEATURE_USE_DEVPS_PATCH # include /* For Erik's nifty devmtab device driver */ #endif enum { MS_MGC_VAL = 0xc0ed0000, /* Magic number indicatng "new" flags */ MS_RDONLY = 1, /* Mount read-only */ MS_NOSUID = 2, /* Ignore suid and sgid bits */ MS_NODEV = 4, /* Disallow access to device special files */ MS_NOEXEC = 8, /* Disallow program execution */ MS_SYNCHRONOUS = 16, /* Writes are synced at once */ MS_REMOUNT = 32, /* Alter flags of a mounted FS */ MS_MANDLOCK = 64, /* Allow mandatory locks on an FS */ S_QUOTA = 128, /* Quota initialized for file/directory/symlink */ S_APPEND = 256, /* Append-only file */ S_IMMUTABLE = 512, /* Immutable file */ MS_NOATIME = 1024, /* Do not update access times. */ MS_NODIRATIME = 2048, /* Do not update directory access times */ MS_BIND = 4096, /* Use the new linux 2.4.x "mount --bind" feature */ }; #if defined BB_FEATURE_MOUNT_LOOP #include #include static int use_loop = FALSE; #endif extern int mount (__const char *__special_file, __const char *__dir, __const char *__fstype, unsigned long int __rwflag, __const void *__data); extern int umount (__const char *__special_file); extern int umount2 (__const char *__special_file, int __flags); extern int sysfs( int option, unsigned int fs_index, char * buf); extern const char mtab_file[]; /* Defined in utility.c */ struct mount_options { const char *name; unsigned long and; unsigned long or; }; static const struct mount_options mount_options[] = { {"async", ~MS_SYNCHRONOUS, 0}, {"atime", ~0, ~MS_NOATIME}, {"defaults", ~0, 0}, {"dev", ~MS_NODEV, 0}, {"diratime", ~0, ~MS_NODIRATIME}, {"exec", ~MS_NOEXEC, 0}, {"noatime", ~0, MS_NOATIME}, {"nodev", ~0, MS_NODEV}, {"nodiratime", ~0, MS_NODIRATIME}, {"noexec", ~0, MS_NOEXEC}, {"nosuid", ~0, MS_NOSUID}, {"remount", ~0, MS_REMOUNT}, {"ro", ~0, MS_RDONLY}, {"rw", ~MS_RDONLY, 0}, {"suid", ~MS_NOSUID, 0}, {"sync", ~0, MS_SYNCHRONOUS}, {"bind", ~0, MS_BIND}, {0, 0, 0} }; static int do_mount(char *specialfile, char *dir, char *filesystemtype, long flags, void *string_flags, int useMtab, int fakeIt, char *mtab_opts, int mount_all) { int status = 0; #if defined BB_FEATURE_MOUNT_LOOP char *lofile = NULL; #endif if (fakeIt == FALSE) { #if defined BB_FEATURE_MOUNT_LOOP if (use_loop==TRUE) { int loro = flags & MS_RDONLY; lofile = specialfile; specialfile = find_unused_loop_device(); if (specialfile == NULL) { error_msg_and_die("Could not find a spare loop device"); } if (set_loop(specialfile, lofile, 0, &loro)) { error_msg_and_die("Could not setup loop device"); } if (!(flags & MS_RDONLY) && loro) { /* loop is ro, but wanted rw */ error_msg("WARNING: loop device is read-only"); flags |= MS_RDONLY; } } #endif status = mount(specialfile, dir, filesystemtype, flags, string_flags); if (status < 0 && errno == EROFS) { error_msg("%s is write-protected, mounting read-only", specialfile); status = mount(specialfile, dir, filesystemtype, flags |= MS_RDONLY, string_flags); } /* Don't whine about already mounted filesystems when mounting all. */ if (status < 0 && errno == EBUSY && mount_all) return TRUE; } /* If the mount was sucessful, do anything needed, then return TRUE */ if (status == 0 || fakeIt==TRUE) { #if defined BB_FEATURE_MTAB_SUPPORT if (useMtab == TRUE) { erase_mtab(specialfile); // Clean any stale entries write_mtab(specialfile, dir, filesystemtype, flags, mtab_opts); } #endif return (TRUE); } /* Bummer. mount failed. Clean up */ #if defined BB_FEATURE_MOUNT_LOOP if (lofile != NULL) { del_loop(specialfile); } #endif if (errno == EPERM) { error_msg_and_die("permission denied. Are you root?"); } return (FALSE); } /* Seperate standard mount options from the nonstandard string options */ static void parse_mount_options(char *options, int *flags, char *strflags) { while (options) { int gotone = FALSE; char *comma = strchr(options, ','); const struct mount_options *f = mount_options; if (comma) *comma = '\0'; while (f->name != 0) { if (strcasecmp(f->name, options) == 0) { *flags &= f->and; *flags |= f->or; gotone = TRUE; break; } f++; } #if defined BB_FEATURE_MOUNT_LOOP if (gotone == FALSE && !strcasecmp("loop", options)) { /* loop device support */ use_loop = TRUE; gotone = TRUE; } #endif if (*strflags && strflags != '\0' && gotone == FALSE) { char *temp = strflags; temp += strlen(strflags); *temp++ = ','; *temp++ = '\0'; } if (gotone == FALSE) strcat(strflags, options); if (comma) { *comma = ','; options = ++comma; } else { break; } } } static int mount_one(char *blockDevice, char *directory, char *filesystemType, unsigned long flags, char *string_flags, int useMtab, int fakeIt, char *mtab_opts, int whineOnErrors, int mount_all) { int status = 0; if (strcmp(filesystemType, "auto") == 0) { static const char *noauto_array[] = { "tmpfs", "shm", "proc", "ramfs", "devpts", "devfs", 0 }; const char **noauto_fstype; const int num_of_filesystems = sysfs(3, 0, 0); char buf[255]; int i=0; filesystemType=buf; while(i < num_of_filesystems) { sysfs(2, i++, filesystemType); for (noauto_fstype = noauto_array; *noauto_fstype; noauto_fstype++) { if (!strcmp(filesystemType, *noauto_fstype)) { break; } } if (!*noauto_fstype) { status = do_mount(blockDevice, directory, filesystemType, flags | MS_MGC_VAL, string_flags, useMtab, fakeIt, mtab_opts, mount_all); if (status == TRUE) break; } } } else { status = do_mount(blockDevice, directory, filesystemType, flags | MS_MGC_VAL, string_flags, useMtab, fakeIt, mtab_opts, mount_all); } if (status == FALSE) { if (whineOnErrors == TRUE) { perror_msg("Mounting %s on %s failed", blockDevice, directory); } return (FALSE); } return (TRUE); } void show_mounts() { #if defined BB_FEATURE_USE_DEVPS_PATCH int fd, i, numfilesystems; char device[] = "/dev/mtab"; struct k_mntent *mntentlist; /* open device */ fd = open(device, O_RDONLY); if (fd < 0) perror_msg_and_die("open failed for `%s'", device); /* How many mounted filesystems? We need to know to * allocate enough space for later... */ numfilesystems = ioctl (fd, DEVMTAB_COUNT_MOUNTS); if (numfilesystems<0) perror_msg_and_die( "\nDEVMTAB_COUNT_MOUNTS"); mntentlist = (struct k_mntent *) xcalloc ( numfilesystems, sizeof(struct k_mntent)); /* Grab the list of mounted filesystems */ if (ioctl (fd, DEVMTAB_GET_MOUNTS, mntentlist)<0) perror_msg_and_die( "\nDEVMTAB_GET_MOUNTS"); for( i = 0 ; i < numfilesystems ; i++) { printf( "%s %s %s %s %d %d\n", mntentlist[i].mnt_fsname, mntentlist[i].mnt_dir, mntentlist[i].mnt_type, mntentlist[i].mnt_opts, mntentlist[i].mnt_freq, mntentlist[i].mnt_passno); } #ifdef BB_FEATURE_CLEAN_UP /* Don't bother to close files or free memory. Exit * does that automagically, so we can save a few bytes */ free( mntentlist); close(fd); #endif exit(EXIT_SUCCESS); #else FILE *mountTable = setmntent(mtab_file, "r"); if (mountTable) { struct mntent *m; while ((m = getmntent(mountTable)) != 0) { char *blockDevice = m->mnt_fsname; if (strcmp(blockDevice, "/dev/root") == 0) { blockDevice = find_real_root_device_name(blockDevice); } printf("%s on %s type %s (%s)\n", blockDevice, m->mnt_dir, m->mnt_type, m->mnt_opts); #ifdef BB_FEATURE_CLEAN_UP if(blockDevice != m->mnt_fsname) free(blockDevice); #endif } endmntent(mountTable); } else { perror_msg_and_die("%s", mtab_file); } exit(EXIT_SUCCESS); #endif } extern int mount_main(int argc, char **argv) { struct stat statbuf; char string_flags_buf[1024] = ""; char *string_flags = string_flags_buf; char *extra_opts = string_flags_buf; int flags = 0; char *filesystemType = "auto"; char *device = xmalloc(PATH_MAX); char *directory = xmalloc(PATH_MAX); int all = FALSE; int fakeIt = FALSE; int useMtab = TRUE; int rc = EXIT_FAILURE; int fstabmount = FALSE; int opt; /* Parse options */ while ((opt = getopt(argc, argv, "o:rt:wafnv")) > 0) { switch (opt) { case 'o': parse_mount_options(optarg, &flags, string_flags); break; case 'r': flags |= MS_RDONLY; break; case 't': filesystemType = optarg; break; case 'w': flags &= ~MS_RDONLY; break; case 'a': all = TRUE; break; case 'f': fakeIt = TRUE; break; #ifdef BB_FEATURE_MTAB_SUPPORT case 'n': useMtab = FALSE; break; #endif case 'v': break; /* ignore -v */ } } if (!all && optind == argc) show_mounts(); if (optind < argc) { /* if device is a filename get its real path */ if (stat(argv[optind], &statbuf) == 0) { realpath(argv[optind], device); } else { safe_strncpy(device, argv[optind], PATH_MAX); } } if (optind + 1 < argc) { if (realpath(argv[optind + 1], directory) == NULL) { perror_msg_and_die("%s", directory); } } if (all == TRUE || optind + 1 == argc) { struct mntent *m = NULL; FILE *f = setmntent("/etc/fstab", "r"); fstabmount = TRUE; if (f == NULL) perror_msg_and_die( "\nCannot read /etc/fstab"); while ((m = getmntent(f)) != NULL) { if (all == FALSE && optind + 1 == argc && ( (strcmp(device, m->mnt_fsname) != 0) && (strcmp(device, m->mnt_dir) != 0) ) ) { continue; } if (all == TRUE && ( // If we're mounting 'all' (strstr(m->mnt_opts, "noauto")) || // and the file system isn't noauto, (strstr(m->mnt_type, "swap")) || // and isn't swap or nfs, then mount it (strstr(m->mnt_type, "nfs")) ) ) { continue; } if (all == TRUE || flags == 0) { // Allow single mount to override fstab flags flags = 0; *string_flags = '\0'; parse_mount_options(m->mnt_opts, &flags, string_flags); } strcpy(device, m->mnt_fsname); strcpy(directory, m->mnt_dir); filesystemType = strdup(m->mnt_type); singlemount: string_flags = strdup(string_flags); rc = EXIT_SUCCESS; #ifdef BB_NFSMOUNT if (strchr(device, ':') != NULL) filesystemType = "nfs"; if (strcmp(filesystemType, "nfs") == 0) { if (nfsmount (device, directory, &flags, &extra_opts, &string_flags, 1)) { perror_msg("nfsmount failed"); rc = EXIT_FAILURE; } } #endif if (!mount_one(device, directory, filesystemType, flags, string_flags, useMtab, fakeIt, extra_opts, TRUE, all)) rc = EXIT_FAILURE; if (all == FALSE) break; } if (fstabmount == TRUE) endmntent(f); if (all == FALSE && fstabmount == TRUE && m == NULL) fprintf(stderr, "Can't find %s in /etc/fstab\n", device); return rc; } goto singlemount; }