| /* vi: set sw=4 ts=4: */ |
| /* |
| * Mini mount implementation for busybox |
| * |
| * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>. |
| * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> |
| * Copyright (C) 2005-2006 by Rob Landley <rob@landley.net> |
| * |
| * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
| */ |
| |
| /* Design notes: There is no spec for mount. Remind me to write one. |
| |
| mount_main() calls singlemount() which calls mount_it_now(). |
| |
| mount_main() can loop through /etc/fstab for mount -a |
| singlemount() can loop through /etc/filesystems for fstype detection. |
| mount_it_now() does the actual mount. |
| */ |
| |
| #include <mntent.h> |
| #include <syslog.h> |
| #include "libbb.h" |
| |
| #if ENABLE_FEATURE_MOUNT_LABEL |
| #include "volume_id.h" |
| #endif |
| |
| /* Needed for nfs support only */ |
| #include <sys/utsname.h> |
| #undef TRUE |
| #undef FALSE |
| #include <rpc/rpc.h> |
| #include <rpc/pmap_prot.h> |
| #include <rpc/pmap_clnt.h> |
| |
| #ifndef MS_SILENT |
| #define MS_SILENT (1 << 15) |
| #endif |
| /* Grab more as needed from util-linux's mount/mount_constants.h */ |
| #ifndef MS_DIRSYNC |
| #define MS_DIRSYNC 128 /* Directory modifications are synchronous */ |
| #endif |
| |
| |
| #if defined(__dietlibc__) |
| /* 16.12.2006, Sampo Kellomaki (sampo@iki.fi) |
| * dietlibc-0.30 does not have implementation of getmntent_r() */ |
| static struct mntent *getmntent_r(FILE* stream, struct mntent* result, |
| char* buffer ATTRIBUTE_UNUSED, int bufsize ATTRIBUTE_UNUSED) |
| { |
| struct mntent* ment = getmntent(stream); |
| return memcpy(result, ment, sizeof(*ment)); |
| } |
| #endif |
| |
| |
| // Not real flags, but we want to be able to check for this. |
| enum { |
| MOUNT_USERS = (1 << 28) * ENABLE_DESKTOP, |
| MOUNT_NOAUTO = (1 << 29), |
| MOUNT_SWAP = (1 << 30), |
| }; |
| |
| |
| #define OPTION_STR "o:t:rwanfvsi" |
| enum { |
| OPT_o = (1 << 0), |
| OPT_t = (1 << 1), |
| OPT_r = (1 << 2), |
| OPT_w = (1 << 3), |
| OPT_a = (1 << 4), |
| OPT_n = (1 << 5), |
| OPT_f = (1 << 6), |
| OPT_v = (1 << 7), |
| OPT_s = (1 << 8), |
| OPT_i = (1 << 9), |
| }; |
| |
| #if ENABLE_FEATURE_MTAB_SUPPORT |
| #define useMtab (!(option_mask32 & OPT_n)) |
| #else |
| #define useMtab 0 |
| #endif |
| |
| #if ENABLE_FEATURE_MOUNT_FAKE |
| #define fakeIt (option_mask32 & OPT_f) |
| #else |
| #define fakeIt 0 |
| #endif |
| |
| |
| // TODO: more "user" flag compatibility. |
| // "user" option (from mount manpage): |
| // Only the user that mounted a filesystem can unmount it again. |
| // If any user should be able to unmount, then use users instead of user |
| // in the fstab line. The owner option is similar to the user option, |
| // with the restriction that the user must be the owner of the special file. |
| // This may be useful e.g. for /dev/fd if a login script makes |
| // the console user owner of this device. |
| |
| /* Standard mount options (from -o options or --options), with corresponding |
| * flags */ |
| |
| static const int32_t mount_options[] = { |
| // MS_FLAGS set a bit. ~MS_FLAGS disable that bit. 0 flags are NOPs. |
| |
| USE_FEATURE_MOUNT_LOOP( |
| /* "loop" */ 0, |
| ) |
| |
| USE_FEATURE_MOUNT_FSTAB( |
| /* "defaults" */ 0, |
| /* "quiet" 0 - do not filter out, vfat wants to see it */ |
| /* "noauto" */ MOUNT_NOAUTO, |
| /* "sw" */ MOUNT_SWAP, |
| /* "swap" */ MOUNT_SWAP, |
| USE_DESKTOP(/* "user" */ MOUNT_USERS,) |
| USE_DESKTOP(/* "users" */ MOUNT_USERS,) |
| /* "_netdev" */ 0, |
| ) |
| |
| USE_FEATURE_MOUNT_FLAGS( |
| // vfs flags |
| /* "nosuid" */ MS_NOSUID, |
| /* "suid" */ ~MS_NOSUID, |
| /* "dev" */ ~MS_NODEV, |
| /* "nodev" */ MS_NODEV, |
| /* "exec" */ ~MS_NOEXEC, |
| /* "noexec" */ MS_NOEXEC, |
| /* "sync" */ MS_SYNCHRONOUS, |
| /* "dirsync" */ MS_DIRSYNC, |
| /* "async" */ ~MS_SYNCHRONOUS, |
| /* "atime" */ ~MS_NOATIME, |
| /* "noatime" */ MS_NOATIME, |
| /* "diratime" */ ~MS_NODIRATIME, |
| /* "nodiratime" */ MS_NODIRATIME, |
| /* "loud" */ ~MS_SILENT, |
| |
| // action flags |
| /* "bind" */ MS_BIND, |
| /* "move" */ MS_MOVE, |
| /* "shared" */ MS_SHARED, |
| /* "slave" */ MS_SLAVE, |
| /* "private" */ MS_PRIVATE, |
| /* "unbindable" */ MS_UNBINDABLE, |
| /* "rshared" */ MS_SHARED|MS_RECURSIVE, |
| /* "rslave" */ MS_SLAVE|MS_RECURSIVE, |
| /* "rprivate" */ MS_SLAVE|MS_RECURSIVE, |
| /* "runbindable" */ MS_UNBINDABLE|MS_RECURSIVE, |
| ) |
| |
| // Always understood. |
| /* "ro" */ MS_RDONLY, // vfs flag |
| /* "rw" */ ~MS_RDONLY, // vfs flag |
| /* "remount" */ MS_REMOUNT // action flag |
| }; |
| |
| static const char mount_option_str[] = |
| USE_FEATURE_MOUNT_LOOP( |
| "loop" "\0" |
| ) |
| USE_FEATURE_MOUNT_FSTAB( |
| "defaults" "\0" |
| /* "quiet" "\0" - do not filter out, vfat wants to see it */ |
| "noauto" "\0" |
| "sw" "\0" |
| "swap" "\0" |
| USE_DESKTOP("user" "\0") |
| USE_DESKTOP("users" "\0") |
| "_netdev" "\0" |
| ) |
| USE_FEATURE_MOUNT_FLAGS( |
| // vfs flags |
| "nosuid" "\0" |
| "suid" "\0" |
| "dev" "\0" |
| "nodev" "\0" |
| "exec" "\0" |
| "noexec" "\0" |
| "sync" "\0" |
| "dirsync" "\0" |
| "async" "\0" |
| "atime" "\0" |
| "noatime" "\0" |
| "diratime" "\0" |
| "nodiratime" "\0" |
| "loud" "\0" |
| |
| // action flags |
| "bind" "\0" |
| "move" "\0" |
| "shared" "\0" |
| "slave" "\0" |
| "private" "\0" |
| "unbindable" "\0" |
| "rshared" "\0" |
| "rslave" "\0" |
| "rprivate" "\0" |
| "runbindable" "\0" |
| ) |
| |
| // Always understood. |
| "ro" "\0" // vfs flag |
| "rw" "\0" // vfs flag |
| "remount" "\0" // action flag |
| ; |
| |
| |
| struct globals { |
| #if ENABLE_FEATURE_MOUNT_NFS |
| smalluint nfs_mount_version; |
| #endif |
| #if ENABLE_FEATURE_MOUNT_VERBOSE |
| unsigned verbose; |
| #endif |
| llist_t *fslist; |
| char getmntent_buf[1]; |
| |
| }; |
| enum { GETMNTENT_BUFSIZE = COMMON_BUFSIZE - offsetof(struct globals, getmntent_buf) }; |
| #define G (*(struct globals*)&bb_common_bufsiz1) |
| #define nfs_mount_version (G.nfs_mount_version) |
| #if ENABLE_FEATURE_MOUNT_VERBOSE |
| #define verbose (G.verbose ) |
| #else |
| #define verbose 0 |
| #endif |
| #define fslist (G.fslist ) |
| #define getmntent_buf (G.getmntent_buf ) |
| |
| |
| #if ENABLE_FEATURE_MOUNT_VERBOSE |
| static int verbose_mount(const char *source, const char *target, |
| const char *filesystemtype, |
| unsigned long mountflags, const void *data) |
| { |
| int rc; |
| |
| errno = 0; |
| rc = mount(source, target, filesystemtype, mountflags, data); |
| if (verbose >= 2) |
| bb_perror_msg("mount('%s','%s','%s',0x%08lx,'%s'):%d", |
| source, target, filesystemtype, |
| mountflags, (char*)data, rc); |
| return rc; |
| } |
| #else |
| #define verbose_mount(...) mount(__VA_ARGS__) |
| #endif |
| |
| static int resolve_mount_spec(char **fsname) |
| { |
| char *tmp = NULL; |
| |
| #if ENABLE_FEATURE_MOUNT_LABEL |
| if (!strncmp(*fsname, "UUID=", 5)) |
| tmp = get_devname_from_uuid(*fsname + 5); |
| else if (!strncmp(*fsname, "LABEL=", 6)) |
| tmp = get_devname_from_label(*fsname + 6); |
| #endif |
| |
| if (tmp) { |
| *fsname = tmp; |
| return 1; |
| } |
| return 0; |
| } |
| |
| /* Append mount options to string */ |
| static void append_mount_options(char **oldopts, const char *newopts) |
| { |
| if (*oldopts && **oldopts) { |
| /* do not insert options which are already there */ |
| while (newopts[0]) { |
| char *p; |
| int len = strlen(newopts); |
| p = strchr(newopts, ','); |
| if (p) len = p - newopts; |
| p = *oldopts; |
| while (1) { |
| if (!strncmp(p, newopts, len) |
| && (p[len] == ',' || p[len] == '\0')) |
| goto skip; |
| p = strchr(p,','); |
| if (!p) break; |
| p++; |
| } |
| p = xasprintf("%s,%.*s", *oldopts, len, newopts); |
| free(*oldopts); |
| *oldopts = p; |
| skip: |
| newopts += len; |
| while (newopts[0] == ',') newopts++; |
| } |
| } else { |
| if (ENABLE_FEATURE_CLEAN_UP) free(*oldopts); |
| *oldopts = xstrdup(newopts); |
| } |
| } |
| |
| /* Use the mount_options list to parse options into flags. |
| * Also return list of unrecognized options if unrecognized!=NULL */ |
| static long parse_mount_options(char *options, char **unrecognized) |
| { |
| long flags = MS_SILENT; |
| |
| // Loop through options |
| for (;;) { |
| unsigned i; |
| char *comma = strchr(options, ','); |
| const char *option_str = mount_option_str; |
| |
| if (comma) *comma = '\0'; |
| |
| /* FIXME: use hasmntopt() */ |
| // Find this option in mount_options |
| for (i = 0; i < ARRAY_SIZE(mount_options); i++) { |
| if (!strcasecmp(option_str, options)) { |
| long fl = mount_options[i]; |
| if (fl < 0) flags &= fl; |
| else flags |= fl; |
| break; |
| } |
| option_str += strlen(option_str) + 1; |
| } |
| // If unrecognized not NULL, append unrecognized mount options */ |
| if (unrecognized && i == ARRAY_SIZE(mount_options)) { |
| // Add it to strflags, to pass on to kernel |
| i = *unrecognized ? strlen(*unrecognized) : 0; |
| *unrecognized = xrealloc(*unrecognized, i+strlen(options)+2); |
| |
| // Comma separated if it's not the first one |
| if (i) (*unrecognized)[i++] = ','; |
| strcpy((*unrecognized)+i, options); |
| } |
| |
| if (!comma) |
| break; |
| // Advance to next option |
| *comma = ','; |
| options = ++comma; |
| } |
| |
| return flags; |
| } |
| |
| // Return a list of all block device backed filesystems |
| |
| static llist_t *get_block_backed_filesystems(void) |
| { |
| static const char filesystems[2][sizeof("/proc/filesystems")] = { |
| "/etc/filesystems", |
| "/proc/filesystems", |
| }; |
| char *fs, *buf; |
| llist_t *list = 0; |
| int i; |
| FILE *f; |
| |
| for (i = 0; i < 2; i++) { |
| f = fopen(filesystems[i], "r"); |
| if (!f) continue; |
| |
| while ((buf = xmalloc_fgetline(f)) != NULL) { |
| if (!strncmp(buf, "nodev", 5) && isspace(buf[5])) |
| continue; |
| fs = skip_whitespace(buf); |
| if (*fs=='#' || *fs=='*' || !*fs) continue; |
| |
| llist_add_to_end(&list, xstrdup(fs)); |
| free(buf); |
| } |
| if (ENABLE_FEATURE_CLEAN_UP) fclose(f); |
| } |
| |
| return list; |
| } |
| |
| #if ENABLE_FEATURE_CLEAN_UP |
| static void delete_block_backed_filesystems(void) |
| { |
| llist_free(fslist, free); |
| } |
| #else |
| void delete_block_backed_filesystems(void); |
| #endif |
| |
| // Perform actual mount of specific filesystem at specific location. |
| // NB: mp->xxx fields may be trashed on exit |
| static int mount_it_now(struct mntent *mp, long vfsflags, char *filteropts) |
| { |
| int rc = 0; |
| |
| if (fakeIt) { |
| if (verbose >= 2) |
| bb_error_msg("would do mount('%s','%s','%s',0x%08lx,'%s')", |
| mp->mnt_fsname, mp->mnt_dir, mp->mnt_type, |
| vfsflags, filteropts); |
| goto mtab; |
| } |
| |
| // Mount, with fallback to read-only if necessary. |
| for (;;) { |
| errno = 0; |
| rc = verbose_mount(mp->mnt_fsname, mp->mnt_dir, mp->mnt_type, |
| vfsflags, filteropts); |
| |
| // If mount failed, try |
| // helper program <mnt_type> |
| if (ENABLE_FEATURE_MOUNT_HELPERS && rc) { |
| char *args[6]; |
| int errno_save = errno; |
| args[0] = xasprintf("mount.%s", mp->mnt_type); |
| rc = 1; |
| if (filteropts) { |
| args[rc++] = (char *)"-o"; |
| args[rc++] = filteropts; |
| } |
| args[rc++] = mp->mnt_fsname; |
| args[rc++] = mp->mnt_dir; |
| args[rc] = NULL; |
| rc = wait4pid(spawn(args)); |
| free(args[0]); |
| if (!rc) |
| break; |
| errno = errno_save; |
| } |
| |
| if (!rc || (vfsflags & MS_RDONLY) || (errno != EACCES && errno != EROFS)) |
| break; |
| if (!(vfsflags & MS_SILENT)) |
| bb_error_msg("%s is write-protected, mounting read-only", |
| mp->mnt_fsname); |
| vfsflags |= MS_RDONLY; |
| } |
| |
| // Abort entirely if permission denied. |
| |
| if (rc && errno == EPERM) |
| bb_error_msg_and_die(bb_msg_perm_denied_are_you_root); |
| |
| /* If the mount was successful, and we're maintaining an old-style |
| * mtab file by hand, add the new entry to it now. */ |
| mtab: |
| if (useMtab && !rc && !(vfsflags & MS_REMOUNT)) { |
| char *fsname; |
| FILE *mountTable = setmntent(bb_path_mtab_file, "a+"); |
| const char *option_str = mount_option_str; |
| int i; |
| |
| if (!mountTable) { |
| bb_error_msg("no %s", bb_path_mtab_file); |
| goto ret; |
| } |
| |
| // Add vfs string flags |
| |
| for (i = 0; mount_options[i] != MS_REMOUNT; i++) { |
| if (mount_options[i] > 0 && (mount_options[i] & vfsflags)) |
| append_mount_options(&(mp->mnt_opts), option_str); |
| option_str += strlen(option_str) + 1; |
| } |
| |
| // Remove trailing / (if any) from directory we mounted on |
| |
| i = strlen(mp->mnt_dir) - 1; |
| if (i > 0 && mp->mnt_dir[i] == '/') mp->mnt_dir[i] = '\0'; |
| |
| // Convert to canonical pathnames as needed |
| |
| mp->mnt_dir = bb_simplify_path(mp->mnt_dir); |
| fsname = 0; |
| if (!mp->mnt_type || !*mp->mnt_type) { /* bind mount */ |
| mp->mnt_fsname = fsname = bb_simplify_path(mp->mnt_fsname); |
| mp->mnt_type = (char*)"bind"; |
| } |
| mp->mnt_freq = mp->mnt_passno = 0; |
| |
| // Write and close. |
| |
| addmntent(mountTable, mp); |
| endmntent(mountTable); |
| if (ENABLE_FEATURE_CLEAN_UP) { |
| free(mp->mnt_dir); |
| free(fsname); |
| } |
| } |
| ret: |
| return rc; |
| } |
| |
| #if ENABLE_FEATURE_MOUNT_NFS |
| |
| /* |
| * Linux NFS mount |
| * Copyright (C) 1993 Rick Sladkey <jrs@world.std.com> |
| * |
| * Licensed under GPLv2, see file LICENSE in this tarball for details. |
| * |
| * Wed Feb 8 12:51:48 1995, biro@yggdrasil.com (Ross Biro): allow all port |
| * numbers to be specified on the command line. |
| * |
| * Fri, 8 Mar 1996 18:01:39, Swen Thuemmler <swen@uni-paderborn.de>: |
| * Omit the call to connect() for Linux version 1.3.11 or later. |
| * |
| * Wed Oct 1 23:55:28 1997: Dick Streefland <dick_streefland@tasking.com> |
| * Implemented the "bg", "fg" and "retry" mount options for NFS. |
| * |
| * 1999-02-22 Arkadiusz Mickiewicz <misiek@misiek.eu.org> |
| * - added Native Language Support |
| * |
| * Modified by Olaf Kirch and Trond Myklebust for new NFS code, |
| * plus NFSv3 stuff. |
| */ |
| |
| /* This is just a warning of a common mistake. Possibly this should be a |
| * uclibc faq entry rather than in busybox... */ |
| #if defined(__UCLIBC__) && ! defined(__UCLIBC_HAS_RPC__) |
| #error "You need to build uClibc with UCLIBC_HAS_RPC for NFS support." |
| #endif |
| |
| #define MOUNTPORT 635 |
| #define MNTPATHLEN 1024 |
| #define MNTNAMLEN 255 |
| #define FHSIZE 32 |
| #define FHSIZE3 64 |
| |
| typedef char fhandle[FHSIZE]; |
| |
| typedef struct { |
| unsigned int fhandle3_len; |
| char *fhandle3_val; |
| } fhandle3; |
| |
| enum mountstat3 { |
| MNT_OK = 0, |
| MNT3ERR_PERM = 1, |
| MNT3ERR_NOENT = 2, |
| MNT3ERR_IO = 5, |
| MNT3ERR_ACCES = 13, |
| MNT3ERR_NOTDIR = 20, |
| MNT3ERR_INVAL = 22, |
| MNT3ERR_NAMETOOLONG = 63, |
| MNT3ERR_NOTSUPP = 10004, |
| MNT3ERR_SERVERFAULT = 10006, |
| }; |
| typedef enum mountstat3 mountstat3; |
| |
| struct fhstatus { |
| unsigned int fhs_status; |
| union { |
| fhandle fhs_fhandle; |
| } fhstatus_u; |
| }; |
| typedef struct fhstatus fhstatus; |
| |
| struct mountres3_ok { |
| fhandle3 fhandle; |
| struct { |
| unsigned int auth_flavours_len; |
| char *auth_flavours_val; |
| } auth_flavours; |
| }; |
| typedef struct mountres3_ok mountres3_ok; |
| |
| struct mountres3 { |
| mountstat3 fhs_status; |
| union { |
| mountres3_ok mountinfo; |
| } mountres3_u; |
| }; |
| typedef struct mountres3 mountres3; |
| |
| typedef char *dirpath; |
| |
| typedef char *name; |
| |
| typedef struct mountbody *mountlist; |
| |
| struct mountbody { |
| name ml_hostname; |
| dirpath ml_directory; |
| mountlist ml_next; |
| }; |
| typedef struct mountbody mountbody; |
| |
| typedef struct groupnode *groups; |
| |
| struct groupnode { |
| name gr_name; |
| groups gr_next; |
| }; |
| typedef struct groupnode groupnode; |
| |
| typedef struct exportnode *exports; |
| |
| struct exportnode { |
| dirpath ex_dir; |
| groups ex_groups; |
| exports ex_next; |
| }; |
| typedef struct exportnode exportnode; |
| |
| struct ppathcnf { |
| int pc_link_max; |
| short pc_max_canon; |
| short pc_max_input; |
| short pc_name_max; |
| short pc_path_max; |
| short pc_pipe_buf; |
| uint8_t pc_vdisable; |
| char pc_xxx; |
| short pc_mask[2]; |
| }; |
| typedef struct ppathcnf ppathcnf; |
| |
| #define MOUNTPROG 100005 |
| #define MOUNTVERS 1 |
| |
| #define MOUNTPROC_NULL 0 |
| #define MOUNTPROC_MNT 1 |
| #define MOUNTPROC_DUMP 2 |
| #define MOUNTPROC_UMNT 3 |
| #define MOUNTPROC_UMNTALL 4 |
| #define MOUNTPROC_EXPORT 5 |
| #define MOUNTPROC_EXPORTALL 6 |
| |
| #define MOUNTVERS_POSIX 2 |
| |
| #define MOUNTPROC_PATHCONF 7 |
| |
| #define MOUNT_V3 3 |
| |
| #define MOUNTPROC3_NULL 0 |
| #define MOUNTPROC3_MNT 1 |
| #define MOUNTPROC3_DUMP 2 |
| #define MOUNTPROC3_UMNT 3 |
| #define MOUNTPROC3_UMNTALL 4 |
| #define MOUNTPROC3_EXPORT 5 |
| |
| enum { |
| #ifndef NFS_FHSIZE |
| NFS_FHSIZE = 32, |
| #endif |
| #ifndef NFS_PORT |
| NFS_PORT = 2049 |
| #endif |
| }; |
| |
| /* |
| * We want to be able to compile mount on old kernels in such a way |
| * that the binary will work well on more recent kernels. |
| * Thus, if necessary we teach nfsmount.c the structure of new fields |
| * that will come later. |
| * |
| * Moreover, the new kernel includes conflict with glibc includes |
| * so it is easiest to ignore the kernel altogether (at compile time). |
| */ |
| |
| struct nfs2_fh { |
| char data[32]; |
| }; |
| struct nfs3_fh { |
| unsigned short size; |
| unsigned char data[64]; |
| }; |
| |
| struct nfs_mount_data { |
| int version; /* 1 */ |
| int fd; /* 1 */ |
| struct nfs2_fh old_root; /* 1 */ |
| int flags; /* 1 */ |
| int rsize; /* 1 */ |
| int wsize; /* 1 */ |
| int timeo; /* 1 */ |
| int retrans; /* 1 */ |
| int acregmin; /* 1 */ |
| int acregmax; /* 1 */ |
| int acdirmin; /* 1 */ |
| int acdirmax; /* 1 */ |
| struct sockaddr_in addr; /* 1 */ |
| char hostname[256]; /* 1 */ |
| int namlen; /* 2 */ |
| unsigned int bsize; /* 3 */ |
| struct nfs3_fh root; /* 4 */ |
| }; |
| |
| /* bits in the flags field */ |
| enum { |
| NFS_MOUNT_SOFT = 0x0001, /* 1 */ |
| NFS_MOUNT_INTR = 0x0002, /* 1 */ |
| NFS_MOUNT_SECURE = 0x0004, /* 1 */ |
| NFS_MOUNT_POSIX = 0x0008, /* 1 */ |
| NFS_MOUNT_NOCTO = 0x0010, /* 1 */ |
| NFS_MOUNT_NOAC = 0x0020, /* 1 */ |
| NFS_MOUNT_TCP = 0x0040, /* 2 */ |
| NFS_MOUNT_VER3 = 0x0080, /* 3 */ |
| NFS_MOUNT_KERBEROS = 0x0100, /* 3 */ |
| NFS_MOUNT_NONLM = 0x0200 /* 3 */ |
| }; |
| |
| |
| /* |
| * We need to translate between nfs status return values and |
| * the local errno values which may not be the same. |
| * |
| * Andreas Schwab <schwab@LS5.informatik.uni-dortmund.de>: change errno: |
| * "after #include <errno.h> the symbol errno is reserved for any use, |
| * it cannot even be used as a struct tag or field name". |
| */ |
| |
| #ifndef EDQUOT |
| #define EDQUOT ENOSPC |
| #endif |
| |
| // Convert each NFSERR_BLAH into EBLAH |
| |
| static const struct { |
| short stat; |
| short errnum; |
| } nfs_errtbl[] = { |
| {0,0}, {1,EPERM}, {2,ENOENT}, {5,EIO}, {6,ENXIO}, {13,EACCES}, {17,EEXIST}, |
| {19,ENODEV}, {20,ENOTDIR}, {21,EISDIR}, {22,EINVAL}, {27,EFBIG}, |
| {28,ENOSPC}, {30,EROFS}, {63,ENAMETOOLONG}, {66,ENOTEMPTY}, {69,EDQUOT}, |
| {70,ESTALE}, {71,EREMOTE}, {-1,EIO} |
| }; |
| |
| static char *nfs_strerror(int status) |
| { |
| int i; |
| |
| for (i = 0; nfs_errtbl[i].stat != -1; i++) { |
| if (nfs_errtbl[i].stat == status) |
| return strerror(nfs_errtbl[i].errnum); |
| } |
| return xasprintf("unknown nfs status return value: %d", status); |
| } |
| |
| static bool_t xdr_fhandle(XDR *xdrs, fhandle objp) |
| { |
| if (!xdr_opaque(xdrs, objp, FHSIZE)) |
| return FALSE; |
| return TRUE; |
| } |
| |
| static bool_t xdr_fhstatus(XDR *xdrs, fhstatus *objp) |
| { |
| if (!xdr_u_int(xdrs, &objp->fhs_status)) |
| return FALSE; |
| switch (objp->fhs_status) { |
| case 0: |
| if (!xdr_fhandle(xdrs, objp->fhstatus_u.fhs_fhandle)) |
| return FALSE; |
| break; |
| default: |
| break; |
| } |
| return TRUE; |
| } |
| |
| static bool_t xdr_dirpath(XDR *xdrs, dirpath *objp) |
| { |
| if (!xdr_string(xdrs, objp, MNTPATHLEN)) |
| return FALSE; |
| return TRUE; |
| } |
| |
| static bool_t xdr_fhandle3(XDR *xdrs, fhandle3 *objp) |
| { |
| if (!xdr_bytes(xdrs, (char **)&objp->fhandle3_val, (unsigned int *) &objp->fhandle3_len, FHSIZE3)) |
| return FALSE; |
| return TRUE; |
| } |
| |
| static bool_t xdr_mountres3_ok(XDR *xdrs, mountres3_ok *objp) |
| { |
| if (!xdr_fhandle3(xdrs, &objp->fhandle)) |
| return FALSE; |
| if (!xdr_array(xdrs, &(objp->auth_flavours.auth_flavours_val), &(objp->auth_flavours.auth_flavours_len), ~0, |
| sizeof (int), (xdrproc_t) xdr_int)) |
| return FALSE; |
| return TRUE; |
| } |
| |
| static bool_t xdr_mountstat3(XDR *xdrs, mountstat3 *objp) |
| { |
| if (!xdr_enum(xdrs, (enum_t *) objp)) |
| return FALSE; |
| return TRUE; |
| } |
| |
| static bool_t xdr_mountres3(XDR *xdrs, mountres3 *objp) |
| { |
| if (!xdr_mountstat3(xdrs, &objp->fhs_status)) |
| return FALSE; |
| switch (objp->fhs_status) { |
| case MNT_OK: |
| if (!xdr_mountres3_ok(xdrs, &objp->mountres3_u.mountinfo)) |
| return FALSE; |
| break; |
| default: |
| break; |
| } |
| return TRUE; |
| } |
| |
| #define MAX_NFSPROT ((nfs_mount_version >= 4) ? 3 : 2) |
| |
| /* |
| * Unfortunately, the kernel prints annoying console messages |
| * in case of an unexpected nfs mount version (instead of |
| * just returning some error). Therefore we'll have to try |
| * and figure out what version the kernel expects. |
| * |
| * Variables: |
| * KERNEL_NFS_MOUNT_VERSION: kernel sources at compile time |
| * NFS_MOUNT_VERSION: these nfsmount sources at compile time |
| * nfs_mount_version: version this source and running kernel can handle |
| */ |
| static void |
| find_kernel_nfs_mount_version(void) |
| { |
| int kernel_version; |
| |
| if (nfs_mount_version) |
| return; |
| |
| nfs_mount_version = 4; /* default */ |
| |
| kernel_version = get_linux_version_code(); |
| if (kernel_version) { |
| if (kernel_version < KERNEL_VERSION(2,1,32)) |
| nfs_mount_version = 1; |
| else if (kernel_version < KERNEL_VERSION(2,2,18) || |
| (kernel_version >= KERNEL_VERSION(2,3,0) && |
| kernel_version < KERNEL_VERSION(2,3,99))) |
| nfs_mount_version = 3; |
| /* else v4 since 2.3.99pre4 */ |
| } |
| } |
| |
| static void |
| get_mountport(struct pmap *pm_mnt, |
| struct sockaddr_in *server_addr, |
| long unsigned prog, |
| long unsigned version, |
| long unsigned proto, |
| long unsigned port) |
| { |
| struct pmaplist *pmap; |
| |
| server_addr->sin_port = PMAPPORT; |
| /* glibc 2.4 (still) has pmap_getmaps(struct sockaddr_in *). |
| * I understand it like "IPv6 for this is not 100% ready" */ |
| pmap = pmap_getmaps(server_addr); |
| |
| if (version > MAX_NFSPROT) |
| version = MAX_NFSPROT; |
| if (!prog) |
| prog = MOUNTPROG; |
| pm_mnt->pm_prog = prog; |
| pm_mnt->pm_vers = version; |
| pm_mnt->pm_prot = proto; |
| pm_mnt->pm_port = port; |
| |
| while (pmap) { |
| if (pmap->pml_map.pm_prog != prog) |
| goto next; |
| if (!version && pm_mnt->pm_vers > pmap->pml_map.pm_vers) |
| goto next; |
| if (version > 2 && pmap->pml_map.pm_vers != version) |
| goto next; |
| if (version && version <= 2 && pmap->pml_map.pm_vers > 2) |
| goto next; |
| if (pmap->pml_map.pm_vers > MAX_NFSPROT || |
| (proto && pm_mnt->pm_prot && pmap->pml_map.pm_prot != proto) || |
| (port && pmap->pml_map.pm_port != port)) |
| goto next; |
| memcpy(pm_mnt, &pmap->pml_map, sizeof(*pm_mnt)); |
| next: |
| pmap = pmap->pml_next; |
| } |
| if (!pm_mnt->pm_vers) |
| pm_mnt->pm_vers = MOUNTVERS; |
| if (!pm_mnt->pm_port) |
| pm_mnt->pm_port = MOUNTPORT; |
| if (!pm_mnt->pm_prot) |
| pm_mnt->pm_prot = IPPROTO_TCP; |
| } |
| |
| #if BB_MMU |
| static int daemonize(void) |
| { |
| int fd; |
| int pid = fork(); |
| if (pid < 0) /* error */ |
| return -errno; |
| if (pid > 0) /* parent */ |
| return 0; |
| /* child */ |
| fd = xopen(bb_dev_null, O_RDWR); |
| dup2(fd, 0); |
| dup2(fd, 1); |
| dup2(fd, 2); |
| while (fd > 2) close(fd--); |
| setsid(); |
| openlog(applet_name, LOG_PID, LOG_DAEMON); |
| logmode = LOGMODE_SYSLOG; |
| return 1; |
| } |
| #else |
| static inline int daemonize(void) { return -ENOSYS; } |
| #endif |
| |
| // TODO |
| static inline int we_saw_this_host_before(const char *hostname ATTRIBUTE_UNUSED) |
| { |
| return 0; |
| } |
| |
| /* RPC strerror analogs are terminally idiotic: |
| * *mandatory* prefix and \n at end. |
| * This hopefully helps. Usage: |
| * error_msg_rpc(clnt_*error*(" ")) */ |
| static void error_msg_rpc(const char *msg) |
| { |
| int len; |
| while (msg[0] == ' ' || msg[0] == ':') msg++; |
| len = strlen(msg); |
| while (len && msg[len-1] == '\n') len--; |
| bb_error_msg("%.*s", len, msg); |
| } |
| |
| // NB: mp->xxx fields may be trashed on exit |
| static int nfsmount(struct mntent *mp, long vfsflags, char *filteropts) |
| { |
| CLIENT *mclient; |
| char *hostname; |
| char *pathname; |
| char *mounthost; |
| struct nfs_mount_data data; |
| char *opt; |
| struct hostent *hp; |
| struct sockaddr_in server_addr; |
| struct sockaddr_in mount_server_addr; |
| int msock, fsock; |
| union { |
| struct fhstatus nfsv2; |
| struct mountres3 nfsv3; |
| } status; |
| int daemonized; |
| char *s; |
| int port; |
| int mountport; |
| int proto; |
| #if BB_MMU |
| int bg = 0; |
| #else |
| enum { bg = 0 }; |
| #endif |
| int soft; |
| int intr; |
| int posix; |
| int nocto; |
| int noac; |
| int nolock; |
| int retry; |
| int tcp; |
| int mountprog; |
| int mountvers; |
| int nfsprog; |
| int nfsvers; |
| int retval; |
| |
| find_kernel_nfs_mount_version(); |
| |
| daemonized = 0; |
| mounthost = NULL; |
| retval = ETIMEDOUT; |
| msock = fsock = -1; |
| mclient = NULL; |
| |
| /* NB: hostname, mounthost, filteropts must be free()d prior to return */ |
| |
| filteropts = xstrdup(filteropts); /* going to trash it later... */ |
| |
| hostname = xstrdup(mp->mnt_fsname); |
| /* mount_main() guarantees that ':' is there */ |
| s = strchr(hostname, ':'); |
| pathname = s + 1; |
| *s = '\0'; |
| /* Ignore all but first hostname in replicated mounts |
| until they can be fully supported. (mack@sgi.com) */ |
| s = strchr(hostname, ','); |
| if (s) { |
| *s = '\0'; |
| bb_error_msg("warning: multiple hostnames not supported"); |
| } |
| |
| server_addr.sin_family = AF_INET; |
| if (!inet_aton(hostname, &server_addr.sin_addr)) { |
| hp = gethostbyname(hostname); |
| if (hp == NULL) { |
| bb_herror_msg("%s", hostname); |
| goto fail; |
| } |
| if ((size_t)hp->h_length > sizeof(struct in_addr)) { |
| bb_error_msg("got bad hp->h_length"); |
| hp->h_length = sizeof(struct in_addr); |
| } |
| memcpy(&server_addr.sin_addr, |
| hp->h_addr, hp->h_length); |
| } |
| |
| memcpy(&mount_server_addr, &server_addr, sizeof(mount_server_addr)); |
| |
| /* add IP address to mtab options for use when unmounting */ |
| |
| if (!mp->mnt_opts) { /* TODO: actually mp->mnt_opts is never NULL */ |
| mp->mnt_opts = xasprintf("addr=%s", inet_ntoa(server_addr.sin_addr)); |
| } else { |
| char *tmp = xasprintf("%s%saddr=%s", mp->mnt_opts, |
| mp->mnt_opts[0] ? "," : "", |
| inet_ntoa(server_addr.sin_addr)); |
| free(mp->mnt_opts); |
| mp->mnt_opts = tmp; |
| } |
| |
| /* Set default options. |
| * rsize/wsize (and bsize, for ver >= 3) are left 0 in order to |
| * let the kernel decide. |
| * timeo is filled in after we know whether it'll be TCP or UDP. */ |
| memset(&data, 0, sizeof(data)); |
| data.retrans = 3; |
| data.acregmin = 3; |
| data.acregmax = 60; |
| data.acdirmin = 30; |
| data.acdirmax = 60; |
| data.namlen = NAME_MAX; |
| |
| soft = 0; |
| intr = 0; |
| posix = 0; |
| nocto = 0; |
| nolock = 0; |
| noac = 0; |
| retry = 10000; /* 10000 minutes ~ 1 week */ |
| tcp = 0; |
| |
| mountprog = MOUNTPROG; |
| mountvers = 0; |
| port = 0; |
| mountport = 0; |
| nfsprog = 100003; |
| nfsvers = 0; |
| |
| /* parse options */ |
| if (filteropts) for (opt = strtok(filteropts, ","); opt; opt = strtok(NULL, ",")) { |
| char *opteq = strchr(opt, '='); |
| if (opteq) { |
| static const char options[] ALIGN1 = |
| /* 0 */ "rsize\0" |
| /* 1 */ "wsize\0" |
| /* 2 */ "timeo\0" |
| /* 3 */ "retrans\0" |
| /* 4 */ "acregmin\0" |
| /* 5 */ "acregmax\0" |
| /* 6 */ "acdirmin\0" |
| /* 7 */ "acdirmax\0" |
| /* 8 */ "actimeo\0" |
| /* 9 */ "retry\0" |
| /* 10 */ "port\0" |
| /* 11 */ "mountport\0" |
| /* 12 */ "mounthost\0" |
| /* 13 */ "mountprog\0" |
| /* 14 */ "mountvers\0" |
| /* 15 */ "nfsprog\0" |
| /* 16 */ "nfsvers\0" |
| /* 17 */ "vers\0" |
| /* 18 */ "proto\0" |
| /* 19 */ "namlen\0" |
| /* 20 */ "addr\0"; |
| int val = xatoi_u(opteq + 1); |
| *opteq = '\0'; |
| switch (index_in_strings(options, opt)) { |
| case 0: // "rsize" |
| data.rsize = val; |
| break; |
| case 1: // "wsize" |
| data.wsize = val; |
| break; |
| case 2: // "timeo" |
| data.timeo = val; |
| break; |
| case 3: // "retrans" |
| data.retrans = val; |
| break; |
| case 4: // "acregmin" |
| data.acregmin = val; |
| break; |
| case 5: // "acregmax" |
| data.acregmax = val; |
| break; |
| case 6: // "acdirmin" |
| data.acdirmin = val; |
| break; |
| case 7: // "acdirmax" |
| data.acdirmax = val; |
| break; |
| case 8: // "actimeo" |
| data.acregmin = val; |
| data.acregmax = val; |
| data.acdirmin = val; |
| data.acdirmax = val; |
| break; |
| case 9: // "retry" |
| retry = val; |
| break; |
| case 10: // "port" |
| port = val; |
| break; |
| case 11: // "mountport" |
| mountport = val; |
| break; |
| case 12: // "mounthost" |
| mounthost = xstrndup(opteq+1, |
| strcspn(opteq+1," \t\n\r,")); |
| break; |
| case 13: // "mountprog" |
| mountprog = val; |
| break; |
| case 14: // "mountvers" |
| mountvers = val; |
| break; |
| case 15: // "nfsprog" |
| nfsprog = val; |
| break; |
| case 16: // "nfsvers" |
| case 17: // "vers" |
| nfsvers = val; |
| break; |
| case 18: // "proto" |
| if (!strncmp(opteq+1, "tcp", 3)) |
| tcp = 1; |
| else if (!strncmp(opteq+1, "udp", 3)) |
| tcp = 0; |
| else |
| bb_error_msg("warning: unrecognized proto= option"); |
| break; |
| case 19: // "namlen" |
| if (nfs_mount_version >= 2) |
| data.namlen = val; |
| else |
| bb_error_msg("warning: option namlen is not supported\n"); |
| break; |
| case 20: // "addr" - ignore |
| break; |
| default: |
| bb_error_msg("unknown nfs mount parameter: %s=%d", opt, val); |
| goto fail; |
| } |
| } |
| else { |
| static const char options[] ALIGN1 = |
| "bg\0" |
| "fg\0" |
| "soft\0" |
| "hard\0" |
| "intr\0" |
| "posix\0" |
| "cto\0" |
| "ac\0" |
| "tcp\0" |
| "udp\0" |
| "lock\0"; |
| int val = 1; |
| if (!strncmp(opt, "no", 2)) { |
| val = 0; |
| opt += 2; |
| } |
| switch (index_in_strings(options, opt)) { |
| case 0: // "bg" |
| #if BB_MMU |
| bg = val; |
| #endif |
| break; |
| case 1: // "fg" |
| #if BB_MMU |
| bg = !val; |
| #endif |
| break; |
| case 2: // "soft" |
| soft = val; |
| break; |
| case 3: // "hard" |
| soft = !val; |
| break; |
| case 4: // "intr" |
| intr = val; |
| break; |
| case 5: // "posix" |
| posix = val; |
| break; |
| case 6: // "cto" |
| nocto = !val; |
| break; |
| case 7: // "ac" |
| noac = !val; |
| break; |
| case 8: // "tcp" |
| tcp = val; |
| break; |
| case 9: // "udp" |
| tcp = !val; |
| break; |
| case 10: // "lock" |
| if (nfs_mount_version >= 3) |
| nolock = !val; |
| else |
| bb_error_msg("warning: option nolock is not supported"); |
| break; |
| default: |
| bb_error_msg("unknown nfs mount option: %s%s", val ? "" : "no", opt); |
| goto fail; |
| } |
| } |
| } |
| proto = (tcp) ? IPPROTO_TCP : IPPROTO_UDP; |
| |
| data.flags = (soft ? NFS_MOUNT_SOFT : 0) |
| | (intr ? NFS_MOUNT_INTR : 0) |
| | (posix ? NFS_MOUNT_POSIX : 0) |
| | (nocto ? NFS_MOUNT_NOCTO : 0) |
| | (noac ? NFS_MOUNT_NOAC : 0); |
| if (nfs_mount_version >= 2) |
| data.flags |= (tcp ? NFS_MOUNT_TCP : 0); |
| if (nfs_mount_version >= 3) |
| data.flags |= (nolock ? NFS_MOUNT_NONLM : 0); |
| if (nfsvers > MAX_NFSPROT || mountvers > MAX_NFSPROT) { |
| bb_error_msg("NFSv%d not supported", nfsvers); |
| goto fail; |
| } |
| if (nfsvers && !mountvers) |
| mountvers = (nfsvers < 3) ? 1 : nfsvers; |
| if (nfsvers && nfsvers < mountvers) { |
| mountvers = nfsvers; |
| } |
| |
| /* Adjust options if none specified */ |
| if (!data.timeo) |
| data.timeo = tcp ? 70 : 7; |
| |
| data.version = nfs_mount_version; |
| |
| if (vfsflags & MS_REMOUNT) |
| goto do_mount; |
| |
| /* |
| * If the previous mount operation on the same host was |
| * backgrounded, and the "bg" for this mount is also set, |
| * give up immediately, to avoid the initial timeout. |
| */ |
| if (bg && we_saw_this_host_before(hostname)) { |
| daemonized = daemonize(); |
| if (daemonized <= 0) { /* parent or error */ |
| retval = -daemonized; |
| goto ret; |
| } |
| } |
| |
| /* create mount daemon client */ |
| /* See if the nfs host = mount host. */ |
| if (mounthost) { |
| if (mounthost[0] >= '0' && mounthost[0] <= '9') { |
| mount_server_addr.sin_family = AF_INET; |
| mount_server_addr.sin_addr.s_addr = inet_addr(hostname); |
| } else { |
| hp = gethostbyname(mounthost); |
| if (hp == NULL) { |
| bb_herror_msg("%s", mounthost); |
| goto fail; |
| } |
| if ((size_t)hp->h_length > sizeof(struct in_addr)) { |
| bb_error_msg("got bad hp->h_length"); |
| hp->h_length = sizeof(struct in_addr); |
| } |
| mount_server_addr.sin_family = AF_INET; |
| memcpy(&mount_server_addr.sin_addr, |
| hp->h_addr, hp->h_length); |
| } |
| } |
| |
| /* |
| * The following loop implements the mount retries. When the mount |
| * times out, and the "bg" option is set, we background ourself |
| * and continue trying. |
| * |
| * The case where the mount point is not present and the "bg" |
| * option is set, is treated as a timeout. This is done to |
| * support nested mounts. |
| * |
| * The "retry" count specified by the user is the number of |
| * minutes to retry before giving up. |
| */ |
| { |
| struct timeval total_timeout; |
| struct timeval retry_timeout; |
| struct pmap pm_mnt; |
| time_t t; |
| time_t prevt; |
| time_t timeout; |
| |
| retry_timeout.tv_sec = 3; |
| retry_timeout.tv_usec = 0; |
| total_timeout.tv_sec = 20; |
| total_timeout.tv_usec = 0; |
| timeout = time(NULL) + 60 * retry; |
| prevt = 0; |
| t = 30; |
| retry: |
| /* be careful not to use too many CPU cycles */ |
| if (t - prevt < 30) |
| sleep(30); |
| |
| get_mountport(&pm_mnt, &mount_server_addr, |
| mountprog, |
| mountvers, |
| proto, |
| mountport); |
| nfsvers = (pm_mnt.pm_vers < 2) ? 2 : pm_mnt.pm_vers; |
| |
| /* contact the mount daemon via TCP */ |
| mount_server_addr.sin_port = htons(pm_mnt.pm_port); |
| msock = RPC_ANYSOCK; |
| |
| switch (pm_mnt.pm_prot) { |
| case IPPROTO_UDP: |
| mclient = clntudp_create(&mount_server_addr, |
| pm_mnt.pm_prog, |
| pm_mnt.pm_vers, |
| retry_timeout, |
| &msock); |
| if (mclient) |
| break; |
| mount_server_addr.sin_port = htons(pm_mnt.pm_port); |
| msock = RPC_ANYSOCK; |
| case IPPROTO_TCP: |
| mclient = clnttcp_create(&mount_server_addr, |
| pm_mnt.pm_prog, |
| pm_mnt.pm_vers, |
| &msock, 0, 0); |
| break; |
| default: |
| mclient = NULL; |
| } |
| if (!mclient) { |
| if (!daemonized && prevt == 0) |
| error_msg_rpc(clnt_spcreateerror(" ")); |
| } else { |
| enum clnt_stat clnt_stat; |
| /* try to mount hostname:pathname */ |
| mclient->cl_auth = authunix_create_default(); |
| |
| /* make pointers in xdr_mountres3 NULL so |
| * that xdr_array allocates memory for us |
| */ |
| memset(&status, 0, sizeof(status)); |
| |
| if (pm_mnt.pm_vers == 3) |
| clnt_stat = clnt_call(mclient, MOUNTPROC3_MNT, |
| (xdrproc_t) xdr_dirpath, |
| (caddr_t) &pathname, |
| (xdrproc_t) xdr_mountres3, |
| (caddr_t) &status, |
| total_timeout); |
| else |
| clnt_stat = clnt_call(mclient, MOUNTPROC_MNT, |
| (xdrproc_t) xdr_dirpath, |
| (caddr_t) &pathname, |
| (xdrproc_t) xdr_fhstatus, |
| (caddr_t) &status, |
| total_timeout); |
| |
| if (clnt_stat == RPC_SUCCESS) |
| goto prepare_kernel_data; /* we're done */ |
| if (errno != ECONNREFUSED) { |
| error_msg_rpc(clnt_sperror(mclient, " ")); |
| goto fail; /* don't retry */ |
| } |
| /* Connection refused */ |
| if (!daemonized && prevt == 0) /* print just once */ |
| error_msg_rpc(clnt_sperror(mclient, " ")); |
| auth_destroy(mclient->cl_auth); |
| clnt_destroy(mclient); |
| mclient = NULL; |
| close(msock); |
| msock = -1; |
| } |
| |
| /* Timeout. We are going to retry... maybe */ |
| |
| if (!bg) |
| goto fail; |
| if (!daemonized) { |
| daemonized = daemonize(); |
| if (daemonized <= 0) { /* parent or error */ |
| retval = -daemonized; |
| goto ret; |
| } |
| } |
| prevt = t; |
| t = time(NULL); |
| if (t >= timeout) |
| /* TODO error message */ |
| goto fail; |
| |
| goto retry; |
| } |
| |
| prepare_kernel_data: |
| |
| if (nfsvers == 2) { |
| if (status.nfsv2.fhs_status != 0) { |
| bb_error_msg("%s:%s failed, reason given by server: %s", |
| hostname, pathname, |
| nfs_strerror(status.nfsv2.fhs_status)); |
| goto fail; |
| } |
| memcpy(data.root.data, |
| (char *) status.nfsv2.fhstatus_u.fhs_fhandle, |
| NFS_FHSIZE); |
| data.root.size = NFS_FHSIZE; |
| memcpy(data.old_root.data, |
| (char *) status.nfsv2.fhstatus_u.fhs_fhandle, |
| NFS_FHSIZE); |
| } else { |
| fhandle3 *my_fhandle; |
| if (status.nfsv3.fhs_status != 0) { |
| bb_error_msg("%s:%s failed, reason given by server: %s", |
| hostname, pathname, |
| nfs_strerror(status.nfsv3.fhs_status)); |
| goto fail; |
| } |
| my_fhandle = &status.nfsv3.mountres3_u.mountinfo.fhandle; |
| memset(data.old_root.data, 0, NFS_FHSIZE); |
| memset(&data.root, 0, sizeof(data.root)); |
| data.root.size = my_fhandle->fhandle3_len; |
| memcpy(data.root.data, |
| (char *) my_fhandle->fhandle3_val, |
| my_fhandle->fhandle3_len); |
| |
| data.flags |= NFS_MOUNT_VER3; |
| } |
| |
| /* create nfs socket for kernel */ |
| |
| if (tcp) { |
| if (nfs_mount_version < 3) { |
| bb_error_msg("NFS over TCP is not supported"); |
| goto fail; |
| } |
| fsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); |
| } else |
| fsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); |
| if (fsock < 0) { |
| bb_perror_msg("nfs socket"); |
| goto fail; |
| } |
| if (bindresvport(fsock, 0) < 0) { |
| bb_perror_msg("nfs bindresvport"); |
| goto fail; |
| } |
| if (port == 0) { |
| server_addr.sin_port = PMAPPORT; |
| port = pmap_getport(&server_addr, nfsprog, nfsvers, |
| tcp ? IPPROTO_TCP : IPPROTO_UDP); |
| if (port == 0) |
| port = NFS_PORT; |
| } |
| server_addr.sin_port = htons(port); |
| |
| /* prepare data structure for kernel */ |
| |
| data.fd = fsock; |
| memcpy((char *) &data.addr, (char *) &server_addr, sizeof(data.addr)); |
| strncpy(data.hostname, hostname, sizeof(data.hostname)); |
| |
| /* clean up */ |
| |
| auth_destroy(mclient->cl_auth); |
| clnt_destroy(mclient); |
| close(msock); |
| msock = -1; |
| |
| if (bg) { |
| /* We must wait until mount directory is available */ |
| struct stat statbuf; |
| int delay = 1; |
| while (stat(mp->mnt_dir, &statbuf) == -1) { |
| if (!daemonized) { |
| daemonized = daemonize(); |
| if (daemonized <= 0) { /* parent or error */ |
| // FIXME: parent doesn't close fsock - ??! |
| retval = -daemonized; |
| goto ret; |
| } |
| } |
| sleep(delay); /* 1, 2, 4, 8, 16, 30, ... */ |
| delay *= 2; |
| if (delay > 30) |
| delay = 30; |
| } |
| } |
| |
| do_mount: /* perform actual mount */ |
| |
| mp->mnt_type = (char*)"nfs"; |
| retval = mount_it_now(mp, vfsflags, (char*)&data); |
| goto ret; |
| |
| fail: /* abort */ |
| |
| if (msock >= 0) { |
| if (mclient) { |
| auth_destroy(mclient->cl_auth); |
| clnt_destroy(mclient); |
| } |
| close(msock); |
| } |
| if (fsock >= 0) |
| close(fsock); |
| |
| ret: |
| free(hostname); |
| free(mounthost); |
| free(filteropts); |
| return retval; |
| } |
| |
| #else /* !ENABLE_FEATURE_MOUNT_NFS */ |
| |
| /* Never called. Call should be optimized out. */ |
| int nfsmount(struct mntent *mp, long vfsflags, char *filteropts); |
| |
| #endif /* !ENABLE_FEATURE_MOUNT_NFS */ |
| |
| // Mount one directory. Handles CIFS, NFS, loopback, autobind, and filesystem |
| // type detection. Returns 0 for success, nonzero for failure. |
| // NB: mp->xxx fields may be trashed on exit |
| static int singlemount(struct mntent *mp, int ignore_busy) |
| { |
| int rc = -1; |
| long vfsflags; |
| char *loopFile = 0, *filteropts = 0; |
| llist_t *fl = 0; |
| struct stat st; |
| |
| vfsflags = parse_mount_options(mp->mnt_opts, &filteropts); |
| |
| // Treat fstype "auto" as unspecified. |
| |
| if (mp->mnt_type && strcmp(mp->mnt_type, "auto") == 0) |
| mp->mnt_type = NULL; |
| |
| // Might this be a virtual filesystem? |
| |
| if (ENABLE_FEATURE_MOUNT_HELPERS |
| && (strchr(mp->mnt_fsname, '#')) |
| ) { |
| char *s, *p, *args[35]; |
| int n = 0; |
| // FIXME: does it allow execution of arbitrary commands?! |
| // What args[0] can end up with? |
| for (s = p = mp->mnt_fsname; *s && n < 35-3; ++s) { |
| if (s[0] == '#' && s[1] != '#') { |
| *s = '\0'; |
| args[n++] = p; |
| p = s + 1; |
| } |
| } |
| args[n++] = p; |
| args[n++] = mp->mnt_dir; |
| args[n] = NULL; |
| rc = wait4pid(xspawn(args)); |
| goto report_error; |
| } |
| |
| // Might this be an CIFS filesystem? |
| |
| if (ENABLE_FEATURE_MOUNT_CIFS |
| && (!mp->mnt_type || strcmp(mp->mnt_type, "cifs") == 0) |
| && (mp->mnt_fsname[0] == '/' || mp->mnt_fsname[0] == '\\') |
| && mp->mnt_fsname[0] == mp->mnt_fsname[1] |
| ) { |
| len_and_sockaddr *lsa; |
| char *ip, *dotted; |
| char *s; |
| |
| rc = 1; |
| // Replace '/' with '\' and verify that unc points to "//server/share". |
| |
| for (s = mp->mnt_fsname; *s; ++s) |
| if (*s == '/') *s = '\\'; |
| |
| // get server IP |
| |
| s = strrchr(mp->mnt_fsname, '\\'); |
| if (s <= mp->mnt_fsname+1) goto report_error; |
| *s = '\0'; |
| lsa = host2sockaddr(mp->mnt_fsname+2, 0); |
| *s = '\\'; |
| if (!lsa) goto report_error; |
| |
| // insert ip=... option into string flags. |
| |
| dotted = xmalloc_sockaddr2dotted_noport(&lsa->u.sa); |
| ip = xasprintf("ip=%s", dotted); |
| parse_mount_options(ip, &filteropts); |
| |
| // compose new unc '\\server-ip\share' |
| // (s => slash after hostname) |
| |
| mp->mnt_fsname = xasprintf("\\\\%s%s", dotted, s); |
| |
| // lock is required |
| vfsflags |= MS_MANDLOCK; |
| |
| mp->mnt_type = (char*)"cifs"; |
| rc = mount_it_now(mp, vfsflags, filteropts); |
| if (ENABLE_FEATURE_CLEAN_UP) { |
| free(mp->mnt_fsname); |
| free(ip); |
| free(dotted); |
| free(lsa); |
| } |
| goto report_error; |
| } |
| |
| // Might this be an NFS filesystem? |
| |
| if (ENABLE_FEATURE_MOUNT_NFS |
| && (!mp->mnt_type || !strcmp(mp->mnt_type, "nfs")) |
| && strchr(mp->mnt_fsname, ':') != NULL |
| ) { |
| rc = nfsmount(mp, vfsflags, filteropts); |
| goto report_error; |
| } |
| |
| // Look at the file. (Not found isn't a failure for remount, or for |
| // a synthetic filesystem like proc or sysfs.) |
| // (We use stat, not lstat, in order to allow |
| // mount symlink_to_file_or_blkdev dir) |
| |
| if (!stat(mp->mnt_fsname, &st) |
| && !(vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE)) |
| ) { |
| // Do we need to allocate a loopback device for it? |
| |
| if (ENABLE_FEATURE_MOUNT_LOOP && S_ISREG(st.st_mode)) { |
| loopFile = bb_simplify_path(mp->mnt_fsname); |
| mp->mnt_fsname = NULL; /* will receive malloced loop dev name */ |
| if (set_loop(&(mp->mnt_fsname), loopFile, 0) < 0) { |
| if (errno == EPERM || errno == EACCES) |
| bb_error_msg(bb_msg_perm_denied_are_you_root); |
| else |
| bb_perror_msg("cannot setup loop device"); |
| return errno; |
| } |
| |
| // Autodetect bind mounts |
| |
| } else if (S_ISDIR(st.st_mode) && !mp->mnt_type) |
| vfsflags |= MS_BIND; |
| } |
| |
| /* If we know the fstype (or don't need to), jump straight |
| * to the actual mount. */ |
| |
| if (mp->mnt_type || (vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE))) |
| rc = mount_it_now(mp, vfsflags, filteropts); |
| else { |
| // Loop through filesystem types until mount succeeds |
| // or we run out |
| |
| /* Initialize list of block backed filesystems. This has to be |
| * done here so that during "mount -a", mounts after /proc shows up |
| * can autodetect. */ |
| |
| if (!fslist) { |
| fslist = get_block_backed_filesystems(); |
| if (ENABLE_FEATURE_CLEAN_UP && fslist) |
| atexit(delete_block_backed_filesystems); |
| } |
| |
| for (fl = fslist; fl; fl = fl->link) { |
| mp->mnt_type = fl->data; |
| rc = mount_it_now(mp, vfsflags, filteropts); |
| if (!rc) break; |
| } |
| } |
| |
| // If mount failed, clean up loop file (if any). |
| |
| if (ENABLE_FEATURE_MOUNT_LOOP && rc && loopFile) { |
| del_loop(mp->mnt_fsname); |
| if (ENABLE_FEATURE_CLEAN_UP) { |
| free(loopFile); |
| free(mp->mnt_fsname); |
| } |
| } |
| |
| report_error: |
| if (ENABLE_FEATURE_CLEAN_UP) |
| free(filteropts); |
| |
| if (errno == EBUSY && ignore_busy) |
| return 0; |
| if (rc < 0) |
| bb_perror_msg("mounting %s on %s failed", mp->mnt_fsname, mp->mnt_dir); |
| return rc; |
| } |
| |
| // Parse options, if necessary parse fstab/mtab, and call singlemount for |
| // each directory to be mounted. |
| |
| static const char must_be_root[] ALIGN1 = "you must be root"; |
| |
| int mount_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| int mount_main(int argc, char **argv) |
| { |
| char *cmdopts = xstrdup(""); |
| char *fstype = NULL; |
| char *storage_path = NULL; |
| char *opt_o; |
| const char *fstabname; |
| FILE *fstab; |
| int i, j, rc = 0; |
| unsigned opt; |
| struct mntent mtpair[2], *mtcur = mtpair; |
| SKIP_DESKTOP(const int nonroot = 0;) |
| |
| USE_DESKTOP( int nonroot = ) sanitize_env_if_suid(); |
| |
| // Parse long options, like --bind and --move. Note that -o option |
| // and --option are synonymous. Yes, this means --remount,rw works. |
| |
| for (i = j = 0; i < argc; i++) { |
| if (argv[i][0] == '-' && argv[i][1] == '-') { |
| append_mount_options(&cmdopts, argv[i]+2); |
| } else argv[j++] = argv[i]; |
| } |
| argv[j] = NULL; |
| argc = j; |
| |
| // Parse remaining options |
| |
| #if ENABLE_FEATURE_MOUNT_VERBOSE |
| opt_complementary = "vv"; // -v is a counter |
| #endif |
| opt = getopt32(argv, OPTION_STR, &opt_o, &fstype |
| USE_FEATURE_MOUNT_VERBOSE(, &verbose)); |
| if (opt & OPT_o) append_mount_options(&cmdopts, opt_o); // -o |
| if (opt & OPT_r) append_mount_options(&cmdopts, "ro"); // -r |
| if (opt & OPT_w) append_mount_options(&cmdopts, "rw"); // -w |
| argv += optind; |
| argc -= optind; |
| |
| // Three or more non-option arguments? Die with a usage message. |
| |
| if (argc > 2) bb_show_usage(); |
| |
| // If we have no arguments, show currently mounted filesystems |
| |
| if (!argc) { |
| if (!(opt & OPT_a)) { |
| FILE *mountTable = setmntent(bb_path_mtab_file, "r"); |
| |
| if (!mountTable) bb_error_msg_and_die("no %s", bb_path_mtab_file); |
| |
| while (getmntent_r(mountTable, &mtpair[0], getmntent_buf, |
| GETMNTENT_BUFSIZE)) |
| { |
| // Don't show rootfs. FIXME: why?? |
| // util-linux 2.12a happily shows rootfs... |
| //if (!strcmp(mtpair->mnt_fsname, "rootfs")) continue; |
| |
| if (!fstype || !strcmp(mtpair->mnt_type, fstype)) |
| printf("%s on %s type %s (%s)\n", mtpair->mnt_fsname, |
| mtpair->mnt_dir, mtpair->mnt_type, |
| mtpair->mnt_opts); |
| } |
| if (ENABLE_FEATURE_CLEAN_UP) endmntent(mountTable); |
| return EXIT_SUCCESS; |
| } |
| } else storage_path = bb_simplify_path(argv[0]); |
| |
| // When we have two arguments, the second is the directory and we can |
| // skip looking at fstab entirely. We can always abspath() the directory |
| // argument when we get it. |
| |
| if (argc == 2) { |
| if (nonroot) |
| bb_error_msg_and_die(must_be_root); |
| mtpair->mnt_fsname = argv[0]; |
| mtpair->mnt_dir = argv[1]; |
| mtpair->mnt_type = fstype; |
| mtpair->mnt_opts = cmdopts; |
| if (ENABLE_FEATURE_MOUNT_LABEL) { |
| resolve_mount_spec(&mtpair->mnt_fsname); |
| } |
| rc = singlemount(mtpair, 0); |
| goto clean_up; |
| } |
| |
| i = parse_mount_options(cmdopts, 0); // FIXME: should be "long", not "int" |
| if (nonroot && (i & ~MS_SILENT)) // Non-root users cannot specify flags |
| bb_error_msg_and_die(must_be_root); |
| |
| // If we have a shared subtree flag, don't worry about fstab or mtab. |
| |
| if (ENABLE_FEATURE_MOUNT_FLAGS |
| && (i & (MS_SHARED | MS_PRIVATE | MS_SLAVE | MS_UNBINDABLE)) |
| ) { |
| rc = verbose_mount("", argv[0], "", i, ""); |
| if (rc) bb_simple_perror_msg_and_die(argv[0]); |
| goto clean_up; |
| } |
| |
| // Open either fstab or mtab |
| |
| fstabname = "/etc/fstab"; |
| if (i & MS_REMOUNT) { |
| fstabname = bb_path_mtab_file; |
| } |
| fstab = setmntent(fstabname, "r"); |
| if (!fstab) |
| bb_perror_msg_and_die("cannot read %s", fstabname); |
| |
| // Loop through entries until we find what we're looking for. |
| |
| memset(mtpair, 0, sizeof(mtpair)); |
| for (;;) { |
| struct mntent *mtnext = (mtcur==mtpair ? mtpair+1 : mtpair); |
| |
| // Get next fstab entry |
| |
| if (!getmntent_r(fstab, mtcur, getmntent_buf |
| + (mtcur==mtpair ? GETMNTENT_BUFSIZE/2 : 0), |
| GETMNTENT_BUFSIZE/2)) |
| { |
| // Were we looking for something specific? |
| |
| if (argc) { |
| |
| // If we didn't find anything, complain. |
| |
| if (!mtnext->mnt_fsname) |
| bb_error_msg_and_die("can't find %s in %s", |
| argv[0], fstabname); |
| |
| mtcur = mtnext; |
| if (nonroot) { |
| // fstab must have "users" or "user" |
| if (!(parse_mount_options(mtcur->mnt_opts, 0) & MOUNT_USERS)) |
| bb_error_msg_and_die(must_be_root); |
| } |
| |
| // Mount the last thing we found. |
| |
| mtcur->mnt_opts = xstrdup(mtcur->mnt_opts); |
| append_mount_options(&(mtcur->mnt_opts), cmdopts); |
| if (ENABLE_FEATURE_MOUNT_LABEL) { |
| resolve_mount_spec(&mtpair->mnt_fsname); |
| } |
| rc = singlemount(mtcur, 0); |
| free(mtcur->mnt_opts); |
| } |
| goto clean_up; |
| } |
| |
| /* If we're trying to mount something specific and this isn't it, |
| * skip it. Note we must match both the exact text in fstab (ala |
| * "proc") or a full path from root */ |
| |
| if (argc) { |
| |
| // Is this what we're looking for? |
| |
| if (strcmp(argv[0], mtcur->mnt_fsname) && |
| strcmp(storage_path, mtcur->mnt_fsname) && |
| strcmp(argv[0], mtcur->mnt_dir) && |
| strcmp(storage_path, mtcur->mnt_dir)) continue; |
| |
| // Remember this entry. Something later may have overmounted |
| // it, and we want the _last_ match. |
| |
| mtcur = mtnext; |
| |
| // If we're mounting all. |
| |
| } else { |
| // Do we need to match a filesystem type? |
| if (fstype && match_fstype(mtcur, fstype)) |
| continue; |
| |
| // Skip noauto and swap anyway. |
| |
| if (parse_mount_options(mtcur->mnt_opts, 0) & (MOUNT_NOAUTO | MOUNT_SWAP)) |
| continue; |
| |
| // No, mount -a won't mount anything, |
| // even user mounts, for mere humans. |
| |
| if (nonroot) |
| bb_error_msg_and_die(must_be_root); |
| |
| // Mount this thing. |
| if (ENABLE_FEATURE_MOUNT_LABEL) |
| resolve_mount_spec(&mtpair->mnt_fsname); |
| |
| // NFS mounts want this to be xrealloc-able |
| mtcur->mnt_opts = xstrdup(mtcur->mnt_opts); |
| if (singlemount(mtcur, 1)) { |
| /* Count number of failed mounts */ |
| rc++; |
| } |
| free(mtcur->mnt_opts); |
| } |
| } |
| if (ENABLE_FEATURE_CLEAN_UP) endmntent(fstab); |
| |
| clean_up: |
| |
| if (ENABLE_FEATURE_CLEAN_UP) { |
| free(storage_path); |
| free(cmdopts); |
| } |
| |
| return rc; |
| } |