[3320] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Mini mount implementation for busybox
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| 4 | *
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| 5 | * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
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| 6 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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| 7 | * Copyright (C) 2005-2006 by Rob Landley <rob@landley.net>
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| 8 | *
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| 9 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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| 10 | */
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| 11 | // Design notes: There is no spec for mount. Remind me to write one.
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| 12 | //
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| 13 | // mount_main() calls singlemount() which calls mount_it_now().
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| 14 | //
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| 15 | // mount_main() can loop through /etc/fstab for mount -a
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| 16 | // singlemount() can loop through /etc/filesystems for fstype detection.
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| 17 | // mount_it_now() does the actual mount.
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| 18 | //
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| 19 | #include <mntent.h>
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| 20 | #include <syslog.h>
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| 21 | #include <sys/mount.h>
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| 22 | // Grab more as needed from util-linux's mount/mount_constants.h
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| 23 | #ifndef MS_DIRSYNC
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| 24 | # define MS_DIRSYNC (1 << 7) // Directory modifications are synchronous
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| 25 | #endif
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| 26 | #ifndef MS_UNION
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| 27 | # define MS_UNION (1 << 8)
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| 28 | #endif
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| 29 | #ifndef MS_BIND
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| 30 | # define MS_BIND (1 << 12)
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| 31 | #endif
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| 32 | #ifndef MS_MOVE
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| 33 | # define MS_MOVE (1 << 13)
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| 34 | #endif
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| 35 | #ifndef MS_RECURSIVE
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| 36 | # define MS_RECURSIVE (1 << 14)
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| 37 | #endif
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| 38 | #ifndef MS_SILENT
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| 39 | # define MS_SILENT (1 << 15)
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| 40 | #endif
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| 41 | // The shared subtree stuff, which went in around 2.6.15
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| 42 | #ifndef MS_UNBINDABLE
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| 43 | # define MS_UNBINDABLE (1 << 17)
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| 44 | #endif
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| 45 | #ifndef MS_PRIVATE
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| 46 | # define MS_PRIVATE (1 << 18)
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| 47 | #endif
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| 48 | #ifndef MS_SLAVE
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| 49 | # define MS_SLAVE (1 << 19)
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| 50 | #endif
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| 51 | #ifndef MS_SHARED
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| 52 | # define MS_SHARED (1 << 20)
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| 53 | #endif
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| 54 | #ifndef MS_RELATIME
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| 55 | # define MS_RELATIME (1 << 21)
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| 56 | #endif
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| 57 |
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| 58 | #include "libbb.h"
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| 59 | #if ENABLE_FEATURE_MOUNT_LABEL
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| 60 | # include "volume_id.h"
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| 61 | #else
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| 62 | # define resolve_mount_spec(fsname) ((void)0)
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| 63 | #endif
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| 64 |
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| 65 | // Needed for nfs support only
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| 66 | #include <sys/utsname.h>
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| 67 | #undef TRUE
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| 68 | #undef FALSE
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| 69 | #if ENABLE_FEATURE_MOUNT_NFS
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| 70 | /* This is just a warning of a common mistake. Possibly this should be a
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| 71 | * uclibc faq entry rather than in busybox... */
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| 72 | # if defined(__UCLIBC__) && ! defined(__UCLIBC_HAS_RPC__)
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| 73 | # error "You need to build uClibc with UCLIBC_HAS_RPC for NFS support"
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| 74 | # endif
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| 75 | # include <rpc/rpc.h>
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| 76 | # include <rpc/pmap_prot.h>
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| 77 | # include <rpc/pmap_clnt.h>
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| 78 | #endif
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| 79 |
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| 80 |
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| 81 | #if defined(__dietlibc__)
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| 82 | // 16.12.2006, Sampo Kellomaki (sampo@iki.fi)
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| 83 | // dietlibc-0.30 does not have implementation of getmntent_r()
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| 84 | static struct mntent *getmntent_r(FILE* stream, struct mntent* result,
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| 85 | char* buffer UNUSED_PARAM, int bufsize UNUSED_PARAM)
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| 86 | {
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| 87 | struct mntent* ment = getmntent(stream);
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| 88 | return memcpy(result, ment, sizeof(*ment));
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| 89 | }
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| 90 | #endif
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| 91 |
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| 92 |
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| 93 | // Not real flags, but we want to be able to check for this.
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| 94 | enum {
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| 95 | MOUNT_USERS = (1 << 28) * ENABLE_DESKTOP,
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| 96 | MOUNT_NOAUTO = (1 << 29),
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| 97 | MOUNT_SWAP = (1 << 30),
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| 98 | };
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| 99 |
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| 100 |
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| 101 | #define OPTION_STR "o:t:rwanfvsiO:"
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| 102 | enum {
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| 103 | OPT_o = (1 << 0),
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| 104 | OPT_t = (1 << 1),
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| 105 | OPT_r = (1 << 2),
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| 106 | OPT_w = (1 << 3),
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| 107 | OPT_a = (1 << 4),
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| 108 | OPT_n = (1 << 5),
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| 109 | OPT_f = (1 << 6),
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| 110 | OPT_v = (1 << 7),
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| 111 | OPT_s = (1 << 8),
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| 112 | OPT_i = (1 << 9),
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| 113 | OPT_O = (1 << 10),
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| 114 | };
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| 115 |
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| 116 | #if ENABLE_FEATURE_MTAB_SUPPORT
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| 117 | #define USE_MTAB (!(option_mask32 & OPT_n))
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| 118 | #else
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| 119 | #define USE_MTAB 0
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| 120 | #endif
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| 121 |
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| 122 | #if ENABLE_FEATURE_MOUNT_FAKE
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| 123 | #define FAKE_IT (option_mask32 & OPT_f)
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| 124 | #else
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| 125 | #define FAKE_IT 0
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| 126 | #endif
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| 127 |
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| 128 | #if ENABLE_FEATURE_MOUNT_HELPERS
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| 129 | #define HELPERS_ALLOWED (!(option_mask32 & OPT_i))
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| 130 | #else
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| 131 | #define HELPERS_ALLOWED 0
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| 132 | #endif
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| 133 |
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| 134 |
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| 135 | // TODO: more "user" flag compatibility.
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| 136 | // "user" option (from mount manpage):
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| 137 | // Only the user that mounted a filesystem can unmount it again.
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| 138 | // If any user should be able to unmount, then use users instead of user
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| 139 | // in the fstab line. The owner option is similar to the user option,
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| 140 | // with the restriction that the user must be the owner of the special file.
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| 141 | // This may be useful e.g. for /dev/fd if a login script makes
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| 142 | // the console user owner of this device.
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| 143 |
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| 144 | // Standard mount options (from -o options or --options),
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| 145 | // with corresponding flags
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| 146 | static const int32_t mount_options[] = {
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| 147 | // MS_FLAGS set a bit. ~MS_FLAGS disable that bit. 0 flags are NOPs.
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| 148 |
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| 149 | IF_FEATURE_MOUNT_LOOP(
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| 150 | /* "loop" */ 0,
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| 151 | )
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| 152 |
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| 153 | IF_FEATURE_MOUNT_FSTAB(
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| 154 | /* "defaults" */ 0,
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| 155 | /* "quiet" 0 - do not filter out, vfat wants to see it */
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| 156 | /* "noauto" */ MOUNT_NOAUTO,
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| 157 | /* "sw" */ MOUNT_SWAP,
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| 158 | /* "swap" */ MOUNT_SWAP,
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| 159 | IF_DESKTOP(/* "user" */ MOUNT_USERS,)
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| 160 | IF_DESKTOP(/* "users" */ MOUNT_USERS,)
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| 161 | /* "_netdev" */ 0,
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| 162 | )
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| 163 |
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| 164 | IF_FEATURE_MOUNT_FLAGS(
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| 165 | // vfs flags
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| 166 | /* "nosuid" */ MS_NOSUID,
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| 167 | /* "suid" */ ~MS_NOSUID,
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| 168 | /* "dev" */ ~MS_NODEV,
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| 169 | /* "nodev" */ MS_NODEV,
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| 170 | /* "exec" */ ~MS_NOEXEC,
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| 171 | /* "noexec" */ MS_NOEXEC,
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| 172 | /* "sync" */ MS_SYNCHRONOUS,
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| 173 | /* "dirsync" */ MS_DIRSYNC,
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| 174 | /* "async" */ ~MS_SYNCHRONOUS,
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| 175 | /* "atime" */ ~MS_NOATIME,
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| 176 | /* "noatime" */ MS_NOATIME,
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| 177 | /* "diratime" */ ~MS_NODIRATIME,
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| 178 | /* "nodiratime" */ MS_NODIRATIME,
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| 179 | /* "mand" */ MS_MANDLOCK,
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| 180 | /* "nomand" */ ~MS_MANDLOCK,
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| 181 | /* "relatime" */ MS_RELATIME,
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| 182 | /* "norelatime" */ ~MS_RELATIME,
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| 183 | /* "loud" */ ~MS_SILENT,
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| 184 |
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| 185 | // action flags
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| 186 | /* "union" */ MS_UNION,
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| 187 | /* "bind" */ MS_BIND,
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| 188 | /* "move" */ MS_MOVE,
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| 189 | /* "shared" */ MS_SHARED,
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| 190 | /* "slave" */ MS_SLAVE,
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| 191 | /* "private" */ MS_PRIVATE,
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| 192 | /* "unbindable" */ MS_UNBINDABLE,
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| 193 | /* "rshared" */ MS_SHARED|MS_RECURSIVE,
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| 194 | /* "rslave" */ MS_SLAVE|MS_RECURSIVE,
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| 195 | /* "rprivate" */ MS_SLAVE|MS_RECURSIVE,
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| 196 | /* "runbindable" */ MS_UNBINDABLE|MS_RECURSIVE,
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| 197 | )
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| 198 |
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| 199 | // Always understood.
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| 200 | /* "ro" */ MS_RDONLY, // vfs flag
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| 201 | /* "rw" */ ~MS_RDONLY, // vfs flag
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| 202 | /* "remount" */ MS_REMOUNT // action flag
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| 203 | };
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| 204 |
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| 205 | static const char mount_option_str[] =
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| 206 | IF_FEATURE_MOUNT_LOOP(
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| 207 | "loop\0"
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| 208 | )
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| 209 | IF_FEATURE_MOUNT_FSTAB(
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| 210 | "defaults\0"
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| 211 | // "quiet\0" - do not filter out, vfat wants to see it
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| 212 | "noauto\0"
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| 213 | "sw\0"
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| 214 | "swap\0"
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| 215 | IF_DESKTOP("user\0")
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| 216 | IF_DESKTOP("users\0")
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| 217 | "_netdev\0"
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| 218 | )
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| 219 | IF_FEATURE_MOUNT_FLAGS(
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| 220 | // vfs flags
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| 221 | "nosuid\0"
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| 222 | "suid\0"
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| 223 | "dev\0"
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| 224 | "nodev\0"
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| 225 | "exec\0"
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| 226 | "noexec\0"
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| 227 | "sync\0"
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| 228 | "dirsync\0"
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| 229 | "async\0"
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| 230 | "atime\0"
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| 231 | "noatime\0"
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| 232 | "diratime\0"
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| 233 | "nodiratime\0"
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| 234 | "mand\0"
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| 235 | "nomand\0"
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| 236 | "relatime\0"
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| 237 | "norelatime\0"
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| 238 | "loud\0"
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| 239 |
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| 240 | // action flags
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| 241 | "union\0"
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| 242 | "bind\0"
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| 243 | "move\0"
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| 244 | "shared\0"
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| 245 | "slave\0"
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| 246 | "private\0"
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| 247 | "unbindable\0"
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| 248 | "rshared\0"
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| 249 | "rslave\0"
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| 250 | "rprivate\0"
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| 251 | "runbindable\0"
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| 252 | )
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| 253 |
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| 254 | // Always understood.
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| 255 | "ro\0" // vfs flag
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| 256 | "rw\0" // vfs flag
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| 257 | "remount\0" // action flag
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| 258 | ;
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| 259 |
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| 260 |
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| 261 | struct globals {
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| 262 | #if ENABLE_FEATURE_MOUNT_NFS
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| 263 | smalluint nfs_mount_version;
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| 264 | #endif
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| 265 | #if ENABLE_FEATURE_MOUNT_VERBOSE
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| 266 | unsigned verbose;
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| 267 | #endif
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| 268 | llist_t *fslist;
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| 269 | char getmntent_buf[1];
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| 270 | } FIX_ALIASING;
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| 271 | enum { GETMNTENT_BUFSIZE = COMMON_BUFSIZE - offsetof(struct globals, getmntent_buf) };
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| 272 | #define G (*(struct globals*)&bb_common_bufsiz1)
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| 273 | #define nfs_mount_version (G.nfs_mount_version)
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| 274 | #if ENABLE_FEATURE_MOUNT_VERBOSE
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| 275 | #define verbose (G.verbose )
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| 276 | #else
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| 277 | #define verbose 0
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| 278 | #endif
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| 279 | #define fslist (G.fslist )
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| 280 | #define getmntent_buf (G.getmntent_buf )
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| 281 |
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| 282 |
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| 283 | #if ENABLE_FEATURE_MOUNT_VERBOSE
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| 284 | static int verbose_mount(const char *source, const char *target,
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| 285 | const char *filesystemtype,
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| 286 | unsigned long mountflags, const void *data)
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| 287 | {
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| 288 | int rc;
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| 289 |
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| 290 | errno = 0;
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| 291 | rc = mount(source, target, filesystemtype, mountflags, data);
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| 292 | if (verbose >= 2)
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| 293 | bb_perror_msg("mount('%s','%s','%s',0x%08lx,'%s'):%d",
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| 294 | source, target, filesystemtype,
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| 295 | mountflags, (char*)data, rc);
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| 296 | return rc;
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| 297 | }
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| 298 | #else
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| 299 | #define verbose_mount(...) mount(__VA_ARGS__)
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| 300 | #endif
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| 301 |
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| 302 | // Append mount options to string
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| 303 | static void append_mount_options(char **oldopts, const char *newopts)
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| 304 | {
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| 305 | if (*oldopts && **oldopts) {
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| 306 | // Do not insert options which are already there
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| 307 | while (newopts[0]) {
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| 308 | char *p;
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| 309 | int len = strlen(newopts);
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| 310 | p = strchr(newopts, ',');
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| 311 | if (p) len = p - newopts;
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| 312 | p = *oldopts;
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| 313 | while (1) {
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| 314 | if (!strncmp(p, newopts, len)
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| 315 | && (p[len] == ',' || p[len] == '\0'))
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| 316 | goto skip;
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| 317 | p = strchr(p,',');
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| 318 | if (!p) break;
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| 319 | p++;
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| 320 | }
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| 321 | p = xasprintf("%s,%.*s", *oldopts, len, newopts);
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| 322 | free(*oldopts);
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| 323 | *oldopts = p;
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| 324 | skip:
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| 325 | newopts += len;
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| 326 | while (newopts[0] == ',') newopts++;
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| 327 | }
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| 328 | } else {
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| 329 | if (ENABLE_FEATURE_CLEAN_UP) free(*oldopts);
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| 330 | *oldopts = xstrdup(newopts);
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| 331 | }
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| 332 | }
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| 333 |
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| 334 | // Use the mount_options list to parse options into flags.
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| 335 | // Also update list of unrecognized options if unrecognized != NULL
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| 336 | static long parse_mount_options(char *options, char **unrecognized)
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| 337 | {
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| 338 | long flags = MS_SILENT;
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| 339 |
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| 340 | // Loop through options
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| 341 | for (;;) {
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| 342 | unsigned i;
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| 343 | char *comma = strchr(options, ',');
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| 344 | const char *option_str = mount_option_str;
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| 345 |
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| 346 | if (comma) *comma = '\0';
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| 347 |
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| 348 | // FIXME: use hasmntopt()
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| 349 | // Find this option in mount_options
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| 350 | for (i = 0; i < ARRAY_SIZE(mount_options); i++) {
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| 351 | if (strcasecmp(option_str, options) == 0) {
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| 352 | long fl = mount_options[i];
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| 353 | if (fl < 0)
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| 354 | flags &= fl;
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| 355 | else
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| 356 | flags |= fl;
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| 357 | goto found;
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| 358 | }
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| 359 | option_str += strlen(option_str) + 1;
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| 360 | }
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| 361 | // We did not recognize this option.
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| 362 | // If "unrecognized" is not NULL, append option there.
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| 363 | // Note that we should not append *empty* option -
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| 364 | // in this case we want to pass NULL, not "", to "data"
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| 365 | // parameter of mount(2) syscall.
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| 366 | // This is crucial for filesystems that don't accept
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| 367 | // any arbitrary mount options, like cgroup fs:
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| 368 | // "mount -t cgroup none /mnt"
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| 369 | if (options[0] && unrecognized) {
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| 370 | // Add it to strflags, to pass on to kernel
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| 371 | char *p = *unrecognized;
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| 372 | unsigned len = p ? strlen(p) : 0;
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| 373 | *unrecognized = p = xrealloc(p, len + strlen(options) + 2);
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| 374 |
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| 375 | // Comma separated if it's not the first one
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| 376 | if (len) p[len++] = ',';
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| 377 | strcpy(p + len, options);
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| 378 | }
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| 379 | found:
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| 380 | if (!comma)
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| 381 | break;
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| 382 | // Advance to next option
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| 383 | *comma = ',';
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| 384 | options = ++comma;
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| 385 | }
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| 386 |
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| 387 | return flags;
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| 388 | }
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| 389 |
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| 390 | // Return a list of all block device backed filesystems
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| 391 | static llist_t *get_block_backed_filesystems(void)
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| 392 | {
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| 393 | static const char filesystems[2][sizeof("/proc/filesystems")] = {
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| 394 | "/etc/filesystems",
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| 395 | "/proc/filesystems",
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| 396 | };
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| 397 | char *fs, *buf;
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| 398 | llist_t *list = NULL;
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| 399 | int i;
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| 400 | FILE *f;
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| 401 |
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| 402 | for (i = 0; i < 2; i++) {
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| 403 | f = fopen_for_read(filesystems[i]);
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| 404 | if (!f) continue;
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| 405 |
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| 406 | while ((buf = xmalloc_fgetline(f)) != NULL) {
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| 407 | if (strncmp(buf, "nodev", 5) == 0 && isspace(buf[5]))
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| 408 | continue;
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| 409 | fs = skip_whitespace(buf);
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| 410 | if (*fs == '#' || *fs == '*' || !*fs)
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| 411 | continue;
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| 412 |
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| 413 | llist_add_to_end(&list, xstrdup(fs));
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| 414 | free(buf);
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| 415 | }
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| 416 | if (ENABLE_FEATURE_CLEAN_UP) fclose(f);
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| 417 | }
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| 418 |
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| 419 | return list;
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| 420 | }
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| 421 |
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| 422 | #if ENABLE_FEATURE_CLEAN_UP
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| 423 | static void delete_block_backed_filesystems(void)
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| 424 | {
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| 425 | llist_free(fslist, free);
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| 426 | }
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| 427 | #else
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| 428 | void delete_block_backed_filesystems(void);
|
---|
| 429 | #endif
|
---|
| 430 |
|
---|
| 431 | // Perform actual mount of specific filesystem at specific location.
|
---|
| 432 | // NB: mp->xxx fields may be trashed on exit
|
---|
| 433 | static int mount_it_now(struct mntent *mp, long vfsflags, char *filteropts)
|
---|
| 434 | {
|
---|
| 435 | int rc = 0;
|
---|
| 436 |
|
---|
| 437 | if (FAKE_IT) {
|
---|
| 438 | if (verbose >= 2)
|
---|
| 439 | bb_error_msg("would do mount('%s','%s','%s',0x%08lx,'%s')",
|
---|
| 440 | mp->mnt_fsname, mp->mnt_dir, mp->mnt_type,
|
---|
| 441 | vfsflags, filteropts);
|
---|
| 442 | goto mtab;
|
---|
| 443 | }
|
---|
| 444 |
|
---|
| 445 | // Mount, with fallback to read-only if necessary.
|
---|
| 446 | for (;;) {
|
---|
| 447 | errno = 0;
|
---|
| 448 | rc = verbose_mount(mp->mnt_fsname, mp->mnt_dir, mp->mnt_type,
|
---|
| 449 | vfsflags, filteropts);
|
---|
| 450 |
|
---|
| 451 | // If mount failed, try
|
---|
| 452 | // helper program mount.<mnt_type>
|
---|
| 453 | if (HELPERS_ALLOWED && rc && mp->mnt_type) {
|
---|
| 454 | char *args[8];
|
---|
| 455 | int errno_save = errno;
|
---|
| 456 | args[0] = xasprintf("mount.%s", mp->mnt_type);
|
---|
| 457 | rc = 1;
|
---|
| 458 | if (FAKE_IT)
|
---|
| 459 | args[rc++] = (char *)"-f";
|
---|
| 460 | if (ENABLE_FEATURE_MTAB_SUPPORT && !USE_MTAB)
|
---|
| 461 | args[rc++] = (char *)"-n";
|
---|
| 462 | args[rc++] = mp->mnt_fsname;
|
---|
| 463 | args[rc++] = mp->mnt_dir;
|
---|
| 464 | if (filteropts) {
|
---|
| 465 | args[rc++] = (char *)"-o";
|
---|
| 466 | args[rc++] = filteropts;
|
---|
| 467 | }
|
---|
| 468 | args[rc] = NULL;
|
---|
| 469 | rc = spawn_and_wait(args);
|
---|
| 470 | free(args[0]);
|
---|
| 471 | if (!rc)
|
---|
| 472 | break;
|
---|
| 473 | errno = errno_save;
|
---|
| 474 | }
|
---|
| 475 |
|
---|
| 476 | if (!rc || (vfsflags & MS_RDONLY) || (errno != EACCES && errno != EROFS))
|
---|
| 477 | break;
|
---|
| 478 | if (!(vfsflags & MS_SILENT))
|
---|
| 479 | bb_error_msg("%s is write-protected, mounting read-only",
|
---|
| 480 | mp->mnt_fsname);
|
---|
| 481 | vfsflags |= MS_RDONLY;
|
---|
| 482 | }
|
---|
| 483 |
|
---|
| 484 | // Abort entirely if permission denied.
|
---|
| 485 |
|
---|
| 486 | if (rc && errno == EPERM)
|
---|
| 487 | bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
|
---|
| 488 |
|
---|
| 489 | // If the mount was successful, and we're maintaining an old-style
|
---|
| 490 | // mtab file by hand, add the new entry to it now.
|
---|
| 491 | mtab:
|
---|
| 492 | if (USE_MTAB && !rc && !(vfsflags & MS_REMOUNT)) {
|
---|
| 493 | char *fsname;
|
---|
| 494 | FILE *mountTable = setmntent(bb_path_mtab_file, "a+");
|
---|
| 495 | const char *option_str = mount_option_str;
|
---|
| 496 | int i;
|
---|
| 497 |
|
---|
| 498 | if (!mountTable) {
|
---|
| 499 | bb_error_msg("no %s", bb_path_mtab_file);
|
---|
| 500 | goto ret;
|
---|
| 501 | }
|
---|
| 502 |
|
---|
| 503 | // Add vfs string flags
|
---|
| 504 |
|
---|
| 505 | for (i = 0; mount_options[i] != MS_REMOUNT; i++) {
|
---|
| 506 | if (mount_options[i] > 0 && (mount_options[i] & vfsflags))
|
---|
| 507 | append_mount_options(&(mp->mnt_opts), option_str);
|
---|
| 508 | option_str += strlen(option_str) + 1;
|
---|
| 509 | }
|
---|
| 510 |
|
---|
| 511 | // Remove trailing / (if any) from directory we mounted on
|
---|
| 512 |
|
---|
| 513 | i = strlen(mp->mnt_dir) - 1;
|
---|
| 514 | if (i > 0 && mp->mnt_dir[i] == '/') mp->mnt_dir[i] = '\0';
|
---|
| 515 |
|
---|
| 516 | // Convert to canonical pathnames as needed
|
---|
| 517 |
|
---|
| 518 | mp->mnt_dir = bb_simplify_path(mp->mnt_dir);
|
---|
| 519 | fsname = 0;
|
---|
| 520 | if (!mp->mnt_type || !*mp->mnt_type) { // bind mount
|
---|
| 521 | mp->mnt_fsname = fsname = bb_simplify_path(mp->mnt_fsname);
|
---|
| 522 | mp->mnt_type = (char*)"bind";
|
---|
| 523 | }
|
---|
| 524 | mp->mnt_freq = mp->mnt_passno = 0;
|
---|
| 525 |
|
---|
| 526 | // Write and close.
|
---|
| 527 |
|
---|
| 528 | addmntent(mountTable, mp);
|
---|
| 529 | endmntent(mountTable);
|
---|
| 530 | if (ENABLE_FEATURE_CLEAN_UP) {
|
---|
| 531 | free(mp->mnt_dir);
|
---|
| 532 | free(fsname);
|
---|
| 533 | }
|
---|
| 534 | }
|
---|
| 535 | ret:
|
---|
| 536 | return rc;
|
---|
| 537 | }
|
---|
| 538 |
|
---|
| 539 | #if ENABLE_FEATURE_MOUNT_NFS
|
---|
| 540 |
|
---|
| 541 | /*
|
---|
| 542 | * Linux NFS mount
|
---|
| 543 | * Copyright (C) 1993 Rick Sladkey <jrs@world.std.com>
|
---|
| 544 | *
|
---|
| 545 | * Licensed under GPLv2, see file LICENSE in this source tree.
|
---|
| 546 | *
|
---|
| 547 | * Wed Feb 8 12:51:48 1995, biro@yggdrasil.com (Ross Biro): allow all port
|
---|
| 548 | * numbers to be specified on the command line.
|
---|
| 549 | *
|
---|
| 550 | * Fri, 8 Mar 1996 18:01:39, Swen Thuemmler <swen@uni-paderborn.de>:
|
---|
| 551 | * Omit the call to connect() for Linux version 1.3.11 or later.
|
---|
| 552 | *
|
---|
| 553 | * Wed Oct 1 23:55:28 1997: Dick Streefland <dick_streefland@tasking.com>
|
---|
| 554 | * Implemented the "bg", "fg" and "retry" mount options for NFS.
|
---|
| 555 | *
|
---|
| 556 | * 1999-02-22 Arkadiusz Mickiewicz <misiek@misiek.eu.org>
|
---|
| 557 | * - added Native Language Support
|
---|
| 558 | *
|
---|
| 559 | * Modified by Olaf Kirch and Trond Myklebust for new NFS code,
|
---|
| 560 | * plus NFSv3 stuff.
|
---|
| 561 | */
|
---|
| 562 |
|
---|
| 563 | #define MOUNTPORT 635
|
---|
| 564 | #define MNTPATHLEN 1024
|
---|
| 565 | #define MNTNAMLEN 255
|
---|
| 566 | #define FHSIZE 32
|
---|
| 567 | #define FHSIZE3 64
|
---|
| 568 |
|
---|
| 569 | typedef char fhandle[FHSIZE];
|
---|
| 570 |
|
---|
| 571 | typedef struct {
|
---|
| 572 | unsigned int fhandle3_len;
|
---|
| 573 | char *fhandle3_val;
|
---|
| 574 | } fhandle3;
|
---|
| 575 |
|
---|
| 576 | enum mountstat3 {
|
---|
| 577 | MNT_OK = 0,
|
---|
| 578 | MNT3ERR_PERM = 1,
|
---|
| 579 | MNT3ERR_NOENT = 2,
|
---|
| 580 | MNT3ERR_IO = 5,
|
---|
| 581 | MNT3ERR_ACCES = 13,
|
---|
| 582 | MNT3ERR_NOTDIR = 20,
|
---|
| 583 | MNT3ERR_INVAL = 22,
|
---|
| 584 | MNT3ERR_NAMETOOLONG = 63,
|
---|
| 585 | MNT3ERR_NOTSUPP = 10004,
|
---|
| 586 | MNT3ERR_SERVERFAULT = 10006,
|
---|
| 587 | };
|
---|
| 588 | typedef enum mountstat3 mountstat3;
|
---|
| 589 |
|
---|
| 590 | struct fhstatus {
|
---|
| 591 | unsigned int fhs_status;
|
---|
| 592 | union {
|
---|
| 593 | fhandle fhs_fhandle;
|
---|
| 594 | } fhstatus_u;
|
---|
| 595 | };
|
---|
| 596 | typedef struct fhstatus fhstatus;
|
---|
| 597 |
|
---|
| 598 | struct mountres3_ok {
|
---|
| 599 | fhandle3 fhandle;
|
---|
| 600 | struct {
|
---|
| 601 | unsigned int auth_flavours_len;
|
---|
| 602 | char *auth_flavours_val;
|
---|
| 603 | } auth_flavours;
|
---|
| 604 | };
|
---|
| 605 | typedef struct mountres3_ok mountres3_ok;
|
---|
| 606 |
|
---|
| 607 | struct mountres3 {
|
---|
| 608 | mountstat3 fhs_status;
|
---|
| 609 | union {
|
---|
| 610 | mountres3_ok mountinfo;
|
---|
| 611 | } mountres3_u;
|
---|
| 612 | };
|
---|
| 613 | typedef struct mountres3 mountres3;
|
---|
| 614 |
|
---|
| 615 | typedef char *dirpath;
|
---|
| 616 |
|
---|
| 617 | typedef char *name;
|
---|
| 618 |
|
---|
| 619 | typedef struct mountbody *mountlist;
|
---|
| 620 |
|
---|
| 621 | struct mountbody {
|
---|
| 622 | name ml_hostname;
|
---|
| 623 | dirpath ml_directory;
|
---|
| 624 | mountlist ml_next;
|
---|
| 625 | };
|
---|
| 626 | typedef struct mountbody mountbody;
|
---|
| 627 |
|
---|
| 628 | typedef struct groupnode *groups;
|
---|
| 629 |
|
---|
| 630 | struct groupnode {
|
---|
| 631 | name gr_name;
|
---|
| 632 | groups gr_next;
|
---|
| 633 | };
|
---|
| 634 | typedef struct groupnode groupnode;
|
---|
| 635 |
|
---|
| 636 | typedef struct exportnode *exports;
|
---|
| 637 |
|
---|
| 638 | struct exportnode {
|
---|
| 639 | dirpath ex_dir;
|
---|
| 640 | groups ex_groups;
|
---|
| 641 | exports ex_next;
|
---|
| 642 | };
|
---|
| 643 | typedef struct exportnode exportnode;
|
---|
| 644 |
|
---|
| 645 | struct ppathcnf {
|
---|
| 646 | int pc_link_max;
|
---|
| 647 | short pc_max_canon;
|
---|
| 648 | short pc_max_input;
|
---|
| 649 | short pc_name_max;
|
---|
| 650 | short pc_path_max;
|
---|
| 651 | short pc_pipe_buf;
|
---|
| 652 | uint8_t pc_vdisable;
|
---|
| 653 | char pc_xxx;
|
---|
| 654 | short pc_mask[2];
|
---|
| 655 | };
|
---|
| 656 | typedef struct ppathcnf ppathcnf;
|
---|
| 657 |
|
---|
| 658 | #define MOUNTPROG 100005
|
---|
| 659 | #define MOUNTVERS 1
|
---|
| 660 |
|
---|
| 661 | #define MOUNTPROC_NULL 0
|
---|
| 662 | #define MOUNTPROC_MNT 1
|
---|
| 663 | #define MOUNTPROC_DUMP 2
|
---|
| 664 | #define MOUNTPROC_UMNT 3
|
---|
| 665 | #define MOUNTPROC_UMNTALL 4
|
---|
| 666 | #define MOUNTPROC_EXPORT 5
|
---|
| 667 | #define MOUNTPROC_EXPORTALL 6
|
---|
| 668 |
|
---|
| 669 | #define MOUNTVERS_POSIX 2
|
---|
| 670 |
|
---|
| 671 | #define MOUNTPROC_PATHCONF 7
|
---|
| 672 |
|
---|
| 673 | #define MOUNT_V3 3
|
---|
| 674 |
|
---|
| 675 | #define MOUNTPROC3_NULL 0
|
---|
| 676 | #define MOUNTPROC3_MNT 1
|
---|
| 677 | #define MOUNTPROC3_DUMP 2
|
---|
| 678 | #define MOUNTPROC3_UMNT 3
|
---|
| 679 | #define MOUNTPROC3_UMNTALL 4
|
---|
| 680 | #define MOUNTPROC3_EXPORT 5
|
---|
| 681 |
|
---|
| 682 | enum {
|
---|
| 683 | #ifndef NFS_FHSIZE
|
---|
| 684 | NFS_FHSIZE = 32,
|
---|
| 685 | #endif
|
---|
| 686 | #ifndef NFS_PORT
|
---|
| 687 | NFS_PORT = 2049
|
---|
| 688 | #endif
|
---|
| 689 | };
|
---|
| 690 |
|
---|
| 691 | /*
|
---|
| 692 | * We want to be able to compile mount on old kernels in such a way
|
---|
| 693 | * that the binary will work well on more recent kernels.
|
---|
| 694 | * Thus, if necessary we teach nfsmount.c the structure of new fields
|
---|
| 695 | * that will come later.
|
---|
| 696 | *
|
---|
| 697 | * Moreover, the new kernel includes conflict with glibc includes
|
---|
| 698 | * so it is easiest to ignore the kernel altogether (at compile time).
|
---|
| 699 | */
|
---|
| 700 |
|
---|
| 701 | struct nfs2_fh {
|
---|
| 702 | char data[32];
|
---|
| 703 | };
|
---|
| 704 | struct nfs3_fh {
|
---|
| 705 | unsigned short size;
|
---|
| 706 | unsigned char data[64];
|
---|
| 707 | };
|
---|
| 708 |
|
---|
| 709 | struct nfs_mount_data {
|
---|
| 710 | int version; /* 1 */
|
---|
| 711 | int fd; /* 1 */
|
---|
| 712 | struct nfs2_fh old_root; /* 1 */
|
---|
| 713 | int flags; /* 1 */
|
---|
| 714 | int rsize; /* 1 */
|
---|
| 715 | int wsize; /* 1 */
|
---|
| 716 | int timeo; /* 1 */
|
---|
| 717 | int retrans; /* 1 */
|
---|
| 718 | int acregmin; /* 1 */
|
---|
| 719 | int acregmax; /* 1 */
|
---|
| 720 | int acdirmin; /* 1 */
|
---|
| 721 | int acdirmax; /* 1 */
|
---|
| 722 | struct sockaddr_in addr; /* 1 */
|
---|
| 723 | char hostname[256]; /* 1 */
|
---|
| 724 | int namlen; /* 2 */
|
---|
| 725 | unsigned int bsize; /* 3 */
|
---|
| 726 | struct nfs3_fh root; /* 4 */
|
---|
| 727 | };
|
---|
| 728 |
|
---|
| 729 | /* bits in the flags field */
|
---|
| 730 | enum {
|
---|
| 731 | NFS_MOUNT_SOFT = 0x0001, /* 1 */
|
---|
| 732 | NFS_MOUNT_INTR = 0x0002, /* 1 */
|
---|
| 733 | NFS_MOUNT_SECURE = 0x0004, /* 1 */
|
---|
| 734 | NFS_MOUNT_POSIX = 0x0008, /* 1 */
|
---|
| 735 | NFS_MOUNT_NOCTO = 0x0010, /* 1 */
|
---|
| 736 | NFS_MOUNT_NOAC = 0x0020, /* 1 */
|
---|
| 737 | NFS_MOUNT_TCP = 0x0040, /* 2 */
|
---|
| 738 | NFS_MOUNT_VER3 = 0x0080, /* 3 */
|
---|
| 739 | NFS_MOUNT_KERBEROS = 0x0100, /* 3 */
|
---|
| 740 | NFS_MOUNT_NONLM = 0x0200, /* 3 */
|
---|
| 741 | NFS_MOUNT_NORDIRPLUS = 0x4000
|
---|
| 742 | };
|
---|
| 743 |
|
---|
| 744 |
|
---|
| 745 | /*
|
---|
| 746 | * We need to translate between nfs status return values and
|
---|
| 747 | * the local errno values which may not be the same.
|
---|
| 748 | *
|
---|
| 749 | * Andreas Schwab <schwab@LS5.informatik.uni-dortmund.de>: change errno:
|
---|
| 750 | * "after #include <errno.h> the symbol errno is reserved for any use,
|
---|
| 751 | * it cannot even be used as a struct tag or field name".
|
---|
| 752 | */
|
---|
| 753 | #ifndef EDQUOT
|
---|
| 754 | # define EDQUOT ENOSPC
|
---|
| 755 | #endif
|
---|
| 756 | /* Convert each NFSERR_BLAH into EBLAH */
|
---|
| 757 | static const uint8_t nfs_err_stat[] = {
|
---|
| 758 | 1, 2, 5, 6, 13, 17,
|
---|
| 759 | 19, 20, 21, 22, 27, 28,
|
---|
| 760 | 30, 63, 66, 69, 70, 71
|
---|
| 761 | };
|
---|
| 762 | #if ( \
|
---|
| 763 | EPERM | ENOENT | EIO | ENXIO | EACCES| EEXIST | \
|
---|
| 764 | ENODEV| ENOTDIR | EISDIR | EINVAL| EFBIG | ENOSPC | \
|
---|
| 765 | EROFS | ENAMETOOLONG| ENOTEMPTY| EDQUOT| ESTALE| EREMOTE) < 256
|
---|
| 766 | typedef uint8_t nfs_err_type;
|
---|
| 767 | #else
|
---|
| 768 | typedef uint16_t nfs_err_type;
|
---|
| 769 | #endif
|
---|
| 770 | static const nfs_err_type nfs_err_errnum[] = {
|
---|
| 771 | EPERM , ENOENT , EIO , ENXIO , EACCES, EEXIST,
|
---|
| 772 | ENODEV, ENOTDIR , EISDIR , EINVAL, EFBIG , ENOSPC,
|
---|
| 773 | EROFS , ENAMETOOLONG, ENOTEMPTY, EDQUOT, ESTALE, EREMOTE
|
---|
| 774 | };
|
---|
| 775 | static char *nfs_strerror(int status)
|
---|
| 776 | {
|
---|
| 777 | int i;
|
---|
| 778 |
|
---|
| 779 | for (i = 0; i < ARRAY_SIZE(nfs_err_stat); i++) {
|
---|
| 780 | if (nfs_err_stat[i] == status)
|
---|
| 781 | return strerror(nfs_err_errnum[i]);
|
---|
| 782 | }
|
---|
| 783 | return xasprintf("unknown nfs status return value: %d", status);
|
---|
| 784 | }
|
---|
| 785 |
|
---|
| 786 | static bool_t xdr_fhandle(XDR *xdrs, fhandle objp)
|
---|
| 787 | {
|
---|
| 788 | return xdr_opaque(xdrs, objp, FHSIZE);
|
---|
| 789 | }
|
---|
| 790 |
|
---|
| 791 | static bool_t xdr_fhstatus(XDR *xdrs, fhstatus *objp)
|
---|
| 792 | {
|
---|
| 793 | if (!xdr_u_int(xdrs, &objp->fhs_status))
|
---|
| 794 | return FALSE;
|
---|
| 795 | if (objp->fhs_status == 0)
|
---|
| 796 | return xdr_fhandle(xdrs, objp->fhstatus_u.fhs_fhandle);
|
---|
| 797 | return TRUE;
|
---|
| 798 | }
|
---|
| 799 |
|
---|
| 800 | static bool_t xdr_dirpath(XDR *xdrs, dirpath *objp)
|
---|
| 801 | {
|
---|
| 802 | return xdr_string(xdrs, objp, MNTPATHLEN);
|
---|
| 803 | }
|
---|
| 804 |
|
---|
| 805 | static bool_t xdr_fhandle3(XDR *xdrs, fhandle3 *objp)
|
---|
| 806 | {
|
---|
| 807 | return xdr_bytes(xdrs, (char **)&objp->fhandle3_val,
|
---|
| 808 | (unsigned int *) &objp->fhandle3_len,
|
---|
| 809 | FHSIZE3);
|
---|
| 810 | }
|
---|
| 811 |
|
---|
| 812 | static bool_t xdr_mountres3_ok(XDR *xdrs, mountres3_ok *objp)
|
---|
| 813 | {
|
---|
| 814 | if (!xdr_fhandle3(xdrs, &objp->fhandle))
|
---|
| 815 | return FALSE;
|
---|
| 816 | return xdr_array(xdrs, &(objp->auth_flavours.auth_flavours_val),
|
---|
| 817 | &(objp->auth_flavours.auth_flavours_len),
|
---|
| 818 | ~0,
|
---|
| 819 | sizeof(int),
|
---|
| 820 | (xdrproc_t) xdr_int);
|
---|
| 821 | }
|
---|
| 822 |
|
---|
| 823 | static bool_t xdr_mountstat3(XDR *xdrs, mountstat3 *objp)
|
---|
| 824 | {
|
---|
| 825 | return xdr_enum(xdrs, (enum_t *) objp);
|
---|
| 826 | }
|
---|
| 827 |
|
---|
| 828 | static bool_t xdr_mountres3(XDR *xdrs, mountres3 *objp)
|
---|
| 829 | {
|
---|
| 830 | if (!xdr_mountstat3(xdrs, &objp->fhs_status))
|
---|
| 831 | return FALSE;
|
---|
| 832 | if (objp->fhs_status == MNT_OK)
|
---|
| 833 | return xdr_mountres3_ok(xdrs, &objp->mountres3_u.mountinfo);
|
---|
| 834 | return TRUE;
|
---|
| 835 | }
|
---|
| 836 |
|
---|
| 837 | #define MAX_NFSPROT ((nfs_mount_version >= 4) ? 3 : 2)
|
---|
| 838 |
|
---|
| 839 | /*
|
---|
| 840 | * Unfortunately, the kernel prints annoying console messages
|
---|
| 841 | * in case of an unexpected nfs mount version (instead of
|
---|
| 842 | * just returning some error). Therefore we'll have to try
|
---|
| 843 | * and figure out what version the kernel expects.
|
---|
| 844 | *
|
---|
| 845 | * Variables:
|
---|
| 846 | * KERNEL_NFS_MOUNT_VERSION: kernel sources at compile time
|
---|
| 847 | * NFS_MOUNT_VERSION: these nfsmount sources at compile time
|
---|
| 848 | * nfs_mount_version: version this source and running kernel can handle
|
---|
| 849 | */
|
---|
| 850 | static void
|
---|
| 851 | find_kernel_nfs_mount_version(void)
|
---|
| 852 | {
|
---|
| 853 | int kernel_version;
|
---|
| 854 |
|
---|
| 855 | if (nfs_mount_version)
|
---|
| 856 | return;
|
---|
| 857 |
|
---|
| 858 | nfs_mount_version = 4; /* default */
|
---|
| 859 |
|
---|
| 860 | kernel_version = get_linux_version_code();
|
---|
| 861 | if (kernel_version) {
|
---|
| 862 | if (kernel_version < KERNEL_VERSION(2,2,18))
|
---|
| 863 | nfs_mount_version = 3;
|
---|
| 864 | /* else v4 since 2.3.99pre4 */
|
---|
| 865 | }
|
---|
| 866 | }
|
---|
| 867 |
|
---|
| 868 | static void
|
---|
| 869 | get_mountport(struct pmap *pm_mnt,
|
---|
| 870 | struct sockaddr_in *server_addr,
|
---|
| 871 | long unsigned prog,
|
---|
| 872 | long unsigned version,
|
---|
| 873 | long unsigned proto,
|
---|
| 874 | long unsigned port)
|
---|
| 875 | {
|
---|
| 876 | struct pmaplist *pmap;
|
---|
| 877 |
|
---|
| 878 | server_addr->sin_port = PMAPPORT;
|
---|
| 879 | /* glibc 2.4 (still) has pmap_getmaps(struct sockaddr_in *).
|
---|
| 880 | * I understand it like "IPv6 for this is not 100% ready" */
|
---|
| 881 | pmap = pmap_getmaps(server_addr);
|
---|
| 882 |
|
---|
| 883 | if (version > MAX_NFSPROT)
|
---|
| 884 | version = MAX_NFSPROT;
|
---|
| 885 | if (!prog)
|
---|
| 886 | prog = MOUNTPROG;
|
---|
| 887 | pm_mnt->pm_prog = prog;
|
---|
| 888 | pm_mnt->pm_vers = version;
|
---|
| 889 | pm_mnt->pm_prot = proto;
|
---|
| 890 | pm_mnt->pm_port = port;
|
---|
| 891 |
|
---|
| 892 | while (pmap) {
|
---|
| 893 | if (pmap->pml_map.pm_prog != prog)
|
---|
| 894 | goto next;
|
---|
| 895 | if (!version && pm_mnt->pm_vers > pmap->pml_map.pm_vers)
|
---|
| 896 | goto next;
|
---|
| 897 | if (version > 2 && pmap->pml_map.pm_vers != version)
|
---|
| 898 | goto next;
|
---|
| 899 | if (version && version <= 2 && pmap->pml_map.pm_vers > 2)
|
---|
| 900 | goto next;
|
---|
| 901 | if (pmap->pml_map.pm_vers > MAX_NFSPROT
|
---|
| 902 | || (proto && pm_mnt->pm_prot && pmap->pml_map.pm_prot != proto)
|
---|
| 903 | || (port && pmap->pml_map.pm_port != port)
|
---|
| 904 | ) {
|
---|
| 905 | goto next;
|
---|
| 906 | }
|
---|
| 907 | memcpy(pm_mnt, &pmap->pml_map, sizeof(*pm_mnt));
|
---|
| 908 | next:
|
---|
| 909 | pmap = pmap->pml_next;
|
---|
| 910 | }
|
---|
| 911 | if (!pm_mnt->pm_vers)
|
---|
| 912 | pm_mnt->pm_vers = MOUNTVERS;
|
---|
| 913 | if (!pm_mnt->pm_port)
|
---|
| 914 | pm_mnt->pm_port = MOUNTPORT;
|
---|
| 915 | if (!pm_mnt->pm_prot)
|
---|
| 916 | pm_mnt->pm_prot = IPPROTO_TCP;
|
---|
| 917 | }
|
---|
| 918 |
|
---|
| 919 | #if BB_MMU
|
---|
| 920 | static int daemonize(void)
|
---|
| 921 | {
|
---|
| 922 | int pid = fork();
|
---|
| 923 | if (pid < 0) /* error */
|
---|
| 924 | return -errno;
|
---|
| 925 | if (pid > 0) /* parent */
|
---|
| 926 | return 0;
|
---|
| 927 | /* child */
|
---|
| 928 | close(0);
|
---|
| 929 | xopen(bb_dev_null, O_RDWR);
|
---|
| 930 | xdup2(0, 1);
|
---|
| 931 | xdup2(0, 2);
|
---|
| 932 | setsid();
|
---|
| 933 | openlog(applet_name, LOG_PID, LOG_DAEMON);
|
---|
| 934 | logmode = LOGMODE_SYSLOG;
|
---|
| 935 | return 1;
|
---|
| 936 | }
|
---|
| 937 | #else
|
---|
| 938 | static inline int daemonize(void) { return -ENOSYS; }
|
---|
| 939 | #endif
|
---|
| 940 |
|
---|
| 941 | /* TODO */
|
---|
| 942 | static inline int we_saw_this_host_before(const char *hostname UNUSED_PARAM)
|
---|
| 943 | {
|
---|
| 944 | return 0;
|
---|
| 945 | }
|
---|
| 946 |
|
---|
| 947 | /* RPC strerror analogs are terminally idiotic:
|
---|
| 948 | * *mandatory* prefix and \n at end.
|
---|
| 949 | * This hopefully helps. Usage:
|
---|
| 950 | * error_msg_rpc(clnt_*error*(" ")) */
|
---|
| 951 | static void error_msg_rpc(const char *msg)
|
---|
| 952 | {
|
---|
| 953 | int len;
|
---|
| 954 | while (msg[0] == ' ' || msg[0] == ':') msg++;
|
---|
| 955 | len = strlen(msg);
|
---|
| 956 | while (len && msg[len-1] == '\n') len--;
|
---|
| 957 | bb_error_msg("%.*s", len, msg);
|
---|
| 958 | }
|
---|
| 959 |
|
---|
| 960 | /* NB: mp->xxx fields may be trashed on exit */
|
---|
| 961 | static NOINLINE int nfsmount(struct mntent *mp, long vfsflags, char *filteropts)
|
---|
| 962 | {
|
---|
| 963 | CLIENT *mclient;
|
---|
| 964 | char *hostname;
|
---|
| 965 | char *pathname;
|
---|
| 966 | char *mounthost;
|
---|
| 967 | /* prior to 2.6.23, kernel took NFS options in a form of this struct
|
---|
| 968 | * only. 2.6.23+ looks at data->version, and if it's not 1..6,
|
---|
| 969 | * then data pointer is interpreted as a string. */
|
---|
| 970 | struct nfs_mount_data data;
|
---|
| 971 | char *opt;
|
---|
| 972 | struct hostent *hp;
|
---|
| 973 | struct sockaddr_in server_addr;
|
---|
| 974 | struct sockaddr_in mount_server_addr;
|
---|
| 975 | int msock, fsock;
|
---|
| 976 | union {
|
---|
| 977 | struct fhstatus nfsv2;
|
---|
| 978 | struct mountres3 nfsv3;
|
---|
| 979 | } status;
|
---|
| 980 | int daemonized;
|
---|
| 981 | char *s;
|
---|
| 982 | int port;
|
---|
| 983 | int mountport;
|
---|
| 984 | int proto;
|
---|
| 985 | #if BB_MMU
|
---|
| 986 | smallint bg = 0;
|
---|
| 987 | #else
|
---|
| 988 | enum { bg = 0 };
|
---|
| 989 | #endif
|
---|
| 990 | int retry;
|
---|
| 991 | int mountprog;
|
---|
| 992 | int mountvers;
|
---|
| 993 | int nfsprog;
|
---|
| 994 | int nfsvers;
|
---|
| 995 | int retval;
|
---|
| 996 | /* these all are one-bit really. gcc 4.3.1 likes this combination: */
|
---|
| 997 | smallint tcp;
|
---|
| 998 | smallint soft;
|
---|
| 999 | int intr;
|
---|
| 1000 | int posix;
|
---|
| 1001 | int nocto;
|
---|
| 1002 | int noac;
|
---|
| 1003 | int nordirplus;
|
---|
| 1004 | int nolock;
|
---|
| 1005 |
|
---|
| 1006 | find_kernel_nfs_mount_version();
|
---|
| 1007 |
|
---|
| 1008 | daemonized = 0;
|
---|
| 1009 | mounthost = NULL;
|
---|
| 1010 | retval = ETIMEDOUT;
|
---|
| 1011 | msock = fsock = -1;
|
---|
| 1012 | mclient = NULL;
|
---|
| 1013 |
|
---|
| 1014 | /* NB: hostname, mounthost, filteropts must be free()d prior to return */
|
---|
| 1015 |
|
---|
| 1016 | filteropts = xstrdup(filteropts); /* going to trash it later... */
|
---|
| 1017 |
|
---|
| 1018 | hostname = xstrdup(mp->mnt_fsname);
|
---|
| 1019 | /* mount_main() guarantees that ':' is there */
|
---|
| 1020 | s = strchr(hostname, ':');
|
---|
| 1021 | pathname = s + 1;
|
---|
| 1022 | *s = '\0';
|
---|
| 1023 | /* Ignore all but first hostname in replicated mounts
|
---|
| 1024 | until they can be fully supported. (mack@sgi.com) */
|
---|
| 1025 | s = strchr(hostname, ',');
|
---|
| 1026 | if (s) {
|
---|
| 1027 | *s = '\0';
|
---|
| 1028 | bb_error_msg("warning: multiple hostnames not supported");
|
---|
| 1029 | }
|
---|
| 1030 |
|
---|
| 1031 | server_addr.sin_family = AF_INET;
|
---|
| 1032 | if (!inet_aton(hostname, &server_addr.sin_addr)) {
|
---|
| 1033 | hp = gethostbyname(hostname);
|
---|
| 1034 | if (hp == NULL) {
|
---|
| 1035 | bb_herror_msg("%s", hostname);
|
---|
| 1036 | goto fail;
|
---|
| 1037 | }
|
---|
| 1038 | if (hp->h_length != (int)sizeof(struct in_addr)) {
|
---|
| 1039 | bb_error_msg_and_die("only IPv4 is supported");
|
---|
| 1040 | }
|
---|
| 1041 | memcpy(&server_addr.sin_addr, hp->h_addr_list[0], sizeof(struct in_addr));
|
---|
| 1042 | }
|
---|
| 1043 |
|
---|
| 1044 | memcpy(&mount_server_addr, &server_addr, sizeof(mount_server_addr));
|
---|
| 1045 |
|
---|
| 1046 | /* add IP address to mtab options for use when unmounting */
|
---|
| 1047 |
|
---|
| 1048 | if (!mp->mnt_opts) { /* TODO: actually mp->mnt_opts is never NULL */
|
---|
| 1049 | mp->mnt_opts = xasprintf("addr=%s", inet_ntoa(server_addr.sin_addr));
|
---|
| 1050 | } else {
|
---|
| 1051 | char *tmp = xasprintf("%s%saddr=%s", mp->mnt_opts,
|
---|
| 1052 | mp->mnt_opts[0] ? "," : "",
|
---|
| 1053 | inet_ntoa(server_addr.sin_addr));
|
---|
| 1054 | free(mp->mnt_opts);
|
---|
| 1055 | mp->mnt_opts = tmp;
|
---|
| 1056 | }
|
---|
| 1057 |
|
---|
| 1058 | /* Set default options.
|
---|
| 1059 | * rsize/wsize (and bsize, for ver >= 3) are left 0 in order to
|
---|
| 1060 | * let the kernel decide.
|
---|
| 1061 | * timeo is filled in after we know whether it'll be TCP or UDP. */
|
---|
| 1062 | memset(&data, 0, sizeof(data));
|
---|
| 1063 | data.retrans = 3;
|
---|
| 1064 | data.acregmin = 3;
|
---|
| 1065 | data.acregmax = 60;
|
---|
| 1066 | data.acdirmin = 30;
|
---|
| 1067 | data.acdirmax = 60;
|
---|
| 1068 | data.namlen = NAME_MAX;
|
---|
| 1069 |
|
---|
| 1070 | soft = 0;
|
---|
| 1071 | intr = 0;
|
---|
| 1072 | posix = 0;
|
---|
| 1073 | nocto = 0;
|
---|
| 1074 | nolock = 0;
|
---|
| 1075 | noac = 0;
|
---|
| 1076 | nordirplus = 0;
|
---|
| 1077 | retry = 10000; /* 10000 minutes ~ 1 week */
|
---|
| 1078 | tcp = 0;
|
---|
| 1079 |
|
---|
| 1080 | mountprog = MOUNTPROG;
|
---|
| 1081 | mountvers = 0;
|
---|
| 1082 | port = 0;
|
---|
| 1083 | mountport = 0;
|
---|
| 1084 | nfsprog = 100003;
|
---|
| 1085 | nfsvers = 0;
|
---|
| 1086 |
|
---|
| 1087 | /* parse options */
|
---|
| 1088 | if (filteropts) for (opt = strtok(filteropts, ","); opt; opt = strtok(NULL, ",")) {
|
---|
| 1089 | char *opteq = strchr(opt, '=');
|
---|
| 1090 | if (opteq) {
|
---|
| 1091 | int val, idx;
|
---|
| 1092 | static const char options[] ALIGN1 =
|
---|
| 1093 | /* 0 */ "rsize\0"
|
---|
| 1094 | /* 1 */ "wsize\0"
|
---|
| 1095 | /* 2 */ "timeo\0"
|
---|
| 1096 | /* 3 */ "retrans\0"
|
---|
| 1097 | /* 4 */ "acregmin\0"
|
---|
| 1098 | /* 5 */ "acregmax\0"
|
---|
| 1099 | /* 6 */ "acdirmin\0"
|
---|
| 1100 | /* 7 */ "acdirmax\0"
|
---|
| 1101 | /* 8 */ "actimeo\0"
|
---|
| 1102 | /* 9 */ "retry\0"
|
---|
| 1103 | /* 10 */ "port\0"
|
---|
| 1104 | /* 11 */ "mountport\0"
|
---|
| 1105 | /* 12 */ "mounthost\0"
|
---|
| 1106 | /* 13 */ "mountprog\0"
|
---|
| 1107 | /* 14 */ "mountvers\0"
|
---|
| 1108 | /* 15 */ "nfsprog\0"
|
---|
| 1109 | /* 16 */ "nfsvers\0"
|
---|
| 1110 | /* 17 */ "vers\0"
|
---|
| 1111 | /* 18 */ "proto\0"
|
---|
| 1112 | /* 19 */ "namlen\0"
|
---|
| 1113 | /* 20 */ "addr\0";
|
---|
| 1114 |
|
---|
| 1115 | *opteq++ = '\0';
|
---|
| 1116 | idx = index_in_strings(options, opt);
|
---|
| 1117 | switch (idx) {
|
---|
| 1118 | case 12: // "mounthost"
|
---|
| 1119 | mounthost = xstrndup(opteq,
|
---|
| 1120 | strcspn(opteq, " \t\n\r,"));
|
---|
| 1121 | continue;
|
---|
| 1122 | case 18: // "proto"
|
---|
| 1123 | if (!strncmp(opteq, "tcp", 3))
|
---|
| 1124 | tcp = 1;
|
---|
| 1125 | else if (!strncmp(opteq, "udp", 3))
|
---|
| 1126 | tcp = 0;
|
---|
| 1127 | else
|
---|
| 1128 | bb_error_msg("warning: unrecognized proto= option");
|
---|
| 1129 | continue;
|
---|
| 1130 | case 20: // "addr" - ignore
|
---|
| 1131 | continue;
|
---|
| 1132 | }
|
---|
| 1133 |
|
---|
| 1134 | val = xatoi_positive(opteq);
|
---|
| 1135 | switch (idx) {
|
---|
| 1136 | case 0: // "rsize"
|
---|
| 1137 | data.rsize = val;
|
---|
| 1138 | continue;
|
---|
| 1139 | case 1: // "wsize"
|
---|
| 1140 | data.wsize = val;
|
---|
| 1141 | continue;
|
---|
| 1142 | case 2: // "timeo"
|
---|
| 1143 | data.timeo = val;
|
---|
| 1144 | continue;
|
---|
| 1145 | case 3: // "retrans"
|
---|
| 1146 | data.retrans = val;
|
---|
| 1147 | continue;
|
---|
| 1148 | case 4: // "acregmin"
|
---|
| 1149 | data.acregmin = val;
|
---|
| 1150 | continue;
|
---|
| 1151 | case 5: // "acregmax"
|
---|
| 1152 | data.acregmax = val;
|
---|
| 1153 | continue;
|
---|
| 1154 | case 6: // "acdirmin"
|
---|
| 1155 | data.acdirmin = val;
|
---|
| 1156 | continue;
|
---|
| 1157 | case 7: // "acdirmax"
|
---|
| 1158 | data.acdirmax = val;
|
---|
| 1159 | continue;
|
---|
| 1160 | case 8: // "actimeo"
|
---|
| 1161 | data.acregmin = val;
|
---|
| 1162 | data.acregmax = val;
|
---|
| 1163 | data.acdirmin = val;
|
---|
| 1164 | data.acdirmax = val;
|
---|
| 1165 | continue;
|
---|
| 1166 | case 9: // "retry"
|
---|
| 1167 | retry = val;
|
---|
| 1168 | continue;
|
---|
| 1169 | case 10: // "port"
|
---|
| 1170 | port = val;
|
---|
| 1171 | continue;
|
---|
| 1172 | case 11: // "mountport"
|
---|
| 1173 | mountport = val;
|
---|
| 1174 | continue;
|
---|
| 1175 | case 13: // "mountprog"
|
---|
| 1176 | mountprog = val;
|
---|
| 1177 | continue;
|
---|
| 1178 | case 14: // "mountvers"
|
---|
| 1179 | mountvers = val;
|
---|
| 1180 | continue;
|
---|
| 1181 | case 15: // "nfsprog"
|
---|
| 1182 | nfsprog = val;
|
---|
| 1183 | continue;
|
---|
| 1184 | case 16: // "nfsvers"
|
---|
| 1185 | case 17: // "vers"
|
---|
| 1186 | nfsvers = val;
|
---|
| 1187 | continue;
|
---|
| 1188 | case 19: // "namlen"
|
---|
| 1189 | //if (nfs_mount_version >= 2)
|
---|
| 1190 | data.namlen = val;
|
---|
| 1191 | //else
|
---|
| 1192 | // bb_error_msg("warning: option namlen is not supported\n");
|
---|
| 1193 | continue;
|
---|
| 1194 | default:
|
---|
| 1195 | bb_error_msg("unknown nfs mount parameter: %s=%d", opt, val);
|
---|
| 1196 | goto fail;
|
---|
| 1197 | }
|
---|
| 1198 | }
|
---|
| 1199 | else { /* not of the form opt=val */
|
---|
| 1200 | static const char options[] ALIGN1 =
|
---|
| 1201 | "bg\0"
|
---|
| 1202 | "fg\0"
|
---|
| 1203 | "soft\0"
|
---|
| 1204 | "hard\0"
|
---|
| 1205 | "intr\0"
|
---|
| 1206 | "posix\0"
|
---|
| 1207 | "cto\0"
|
---|
| 1208 | "ac\0"
|
---|
| 1209 | "tcp\0"
|
---|
| 1210 | "udp\0"
|
---|
| 1211 | "lock\0"
|
---|
| 1212 | "rdirplus\0";
|
---|
| 1213 | int val = 1;
|
---|
| 1214 | if (!strncmp(opt, "no", 2)) {
|
---|
| 1215 | val = 0;
|
---|
| 1216 | opt += 2;
|
---|
| 1217 | }
|
---|
| 1218 | switch (index_in_strings(options, opt)) {
|
---|
| 1219 | case 0: // "bg"
|
---|
| 1220 | #if BB_MMU
|
---|
| 1221 | bg = val;
|
---|
| 1222 | #endif
|
---|
| 1223 | break;
|
---|
| 1224 | case 1: // "fg"
|
---|
| 1225 | #if BB_MMU
|
---|
| 1226 | bg = !val;
|
---|
| 1227 | #endif
|
---|
| 1228 | break;
|
---|
| 1229 | case 2: // "soft"
|
---|
| 1230 | soft = val;
|
---|
| 1231 | break;
|
---|
| 1232 | case 3: // "hard"
|
---|
| 1233 | soft = !val;
|
---|
| 1234 | break;
|
---|
| 1235 | case 4: // "intr"
|
---|
| 1236 | intr = val;
|
---|
| 1237 | break;
|
---|
| 1238 | case 5: // "posix"
|
---|
| 1239 | posix = val;
|
---|
| 1240 | break;
|
---|
| 1241 | case 6: // "cto"
|
---|
| 1242 | nocto = !val;
|
---|
| 1243 | break;
|
---|
| 1244 | case 7: // "ac"
|
---|
| 1245 | noac = !val;
|
---|
| 1246 | break;
|
---|
| 1247 | case 8: // "tcp"
|
---|
| 1248 | tcp = val;
|
---|
| 1249 | break;
|
---|
| 1250 | case 9: // "udp"
|
---|
| 1251 | tcp = !val;
|
---|
| 1252 | break;
|
---|
| 1253 | case 10: // "lock"
|
---|
| 1254 | if (nfs_mount_version >= 3)
|
---|
| 1255 | nolock = !val;
|
---|
| 1256 | else
|
---|
| 1257 | bb_error_msg("warning: option nolock is not supported");
|
---|
| 1258 | break;
|
---|
| 1259 | case 11: //rdirplus
|
---|
| 1260 | nordirplus = !val;
|
---|
| 1261 | break;
|
---|
| 1262 | default:
|
---|
| 1263 | bb_error_msg("unknown nfs mount option: %s%s", val ? "" : "no", opt);
|
---|
| 1264 | goto fail;
|
---|
| 1265 | }
|
---|
| 1266 | }
|
---|
| 1267 | }
|
---|
| 1268 | proto = (tcp) ? IPPROTO_TCP : IPPROTO_UDP;
|
---|
| 1269 |
|
---|
| 1270 | data.flags = (soft ? NFS_MOUNT_SOFT : 0)
|
---|
| 1271 | | (intr ? NFS_MOUNT_INTR : 0)
|
---|
| 1272 | | (posix ? NFS_MOUNT_POSIX : 0)
|
---|
| 1273 | | (nocto ? NFS_MOUNT_NOCTO : 0)
|
---|
| 1274 | | (noac ? NFS_MOUNT_NOAC : 0)
|
---|
| 1275 | | (nordirplus ? NFS_MOUNT_NORDIRPLUS : 0);
|
---|
| 1276 | if (nfs_mount_version >= 2)
|
---|
| 1277 | data.flags |= (tcp ? NFS_MOUNT_TCP : 0);
|
---|
| 1278 | if (nfs_mount_version >= 3)
|
---|
| 1279 | data.flags |= (nolock ? NFS_MOUNT_NONLM : 0);
|
---|
| 1280 | if (nfsvers > MAX_NFSPROT || mountvers > MAX_NFSPROT) {
|
---|
| 1281 | bb_error_msg("NFSv%d not supported", nfsvers);
|
---|
| 1282 | goto fail;
|
---|
| 1283 | }
|
---|
| 1284 | if (nfsvers && !mountvers)
|
---|
| 1285 | mountvers = (nfsvers < 3) ? 1 : nfsvers;
|
---|
| 1286 | if (nfsvers && nfsvers < mountvers) {
|
---|
| 1287 | mountvers = nfsvers;
|
---|
| 1288 | }
|
---|
| 1289 |
|
---|
| 1290 | /* Adjust options if none specified */
|
---|
| 1291 | if (!data.timeo)
|
---|
| 1292 | data.timeo = tcp ? 70 : 7;
|
---|
| 1293 |
|
---|
| 1294 | data.version = nfs_mount_version;
|
---|
| 1295 |
|
---|
| 1296 | if (vfsflags & MS_REMOUNT)
|
---|
| 1297 | goto do_mount;
|
---|
| 1298 |
|
---|
| 1299 | /*
|
---|
| 1300 | * If the previous mount operation on the same host was
|
---|
| 1301 | * backgrounded, and the "bg" for this mount is also set,
|
---|
| 1302 | * give up immediately, to avoid the initial timeout.
|
---|
| 1303 | */
|
---|
| 1304 | if (bg && we_saw_this_host_before(hostname)) {
|
---|
| 1305 | daemonized = daemonize();
|
---|
| 1306 | if (daemonized <= 0) { /* parent or error */
|
---|
| 1307 | retval = -daemonized;
|
---|
| 1308 | goto ret;
|
---|
| 1309 | }
|
---|
| 1310 | }
|
---|
| 1311 |
|
---|
| 1312 | /* Create mount daemon client */
|
---|
| 1313 | /* See if the nfs host = mount host. */
|
---|
| 1314 | if (mounthost) {
|
---|
| 1315 | if (mounthost[0] >= '0' && mounthost[0] <= '9') {
|
---|
| 1316 | mount_server_addr.sin_family = AF_INET;
|
---|
| 1317 | mount_server_addr.sin_addr.s_addr = inet_addr(hostname);
|
---|
| 1318 | } else {
|
---|
| 1319 | hp = gethostbyname(mounthost);
|
---|
| 1320 | if (hp == NULL) {
|
---|
| 1321 | bb_herror_msg("%s", mounthost);
|
---|
| 1322 | goto fail;
|
---|
| 1323 | }
|
---|
| 1324 | if (hp->h_length != (int)sizeof(struct in_addr)) {
|
---|
| 1325 | bb_error_msg_and_die("only IPv4 is supported");
|
---|
| 1326 | }
|
---|
| 1327 | mount_server_addr.sin_family = AF_INET;
|
---|
| 1328 | memcpy(&mount_server_addr.sin_addr, hp->h_addr_list[0], sizeof(struct in_addr));
|
---|
| 1329 | }
|
---|
| 1330 | }
|
---|
| 1331 |
|
---|
| 1332 | /*
|
---|
| 1333 | * The following loop implements the mount retries. When the mount
|
---|
| 1334 | * times out, and the "bg" option is set, we background ourself
|
---|
| 1335 | * and continue trying.
|
---|
| 1336 | *
|
---|
| 1337 | * The case where the mount point is not present and the "bg"
|
---|
| 1338 | * option is set, is treated as a timeout. This is done to
|
---|
| 1339 | * support nested mounts.
|
---|
| 1340 | *
|
---|
| 1341 | * The "retry" count specified by the user is the number of
|
---|
| 1342 | * minutes to retry before giving up.
|
---|
| 1343 | */
|
---|
| 1344 | {
|
---|
| 1345 | struct timeval total_timeout;
|
---|
| 1346 | struct timeval retry_timeout;
|
---|
| 1347 | struct pmap pm_mnt;
|
---|
| 1348 | time_t t;
|
---|
| 1349 | time_t prevt;
|
---|
| 1350 | time_t timeout;
|
---|
| 1351 |
|
---|
| 1352 | retry_timeout.tv_sec = 3;
|
---|
| 1353 | retry_timeout.tv_usec = 0;
|
---|
| 1354 | total_timeout.tv_sec = 20;
|
---|
| 1355 | total_timeout.tv_usec = 0;
|
---|
| 1356 | /* FIXME: use monotonic()? */
|
---|
| 1357 | timeout = time(NULL) + 60 * retry;
|
---|
| 1358 | prevt = 0;
|
---|
| 1359 | t = 30;
|
---|
| 1360 | retry:
|
---|
| 1361 | /* Be careful not to use too many CPU cycles */
|
---|
| 1362 | if (t - prevt < 30)
|
---|
| 1363 | sleep(30);
|
---|
| 1364 |
|
---|
| 1365 | get_mountport(&pm_mnt, &mount_server_addr,
|
---|
| 1366 | mountprog,
|
---|
| 1367 | mountvers,
|
---|
| 1368 | proto,
|
---|
| 1369 | mountport);
|
---|
| 1370 | nfsvers = (pm_mnt.pm_vers < 2) ? 2 : pm_mnt.pm_vers;
|
---|
| 1371 |
|
---|
| 1372 | /* contact the mount daemon via TCP */
|
---|
| 1373 | mount_server_addr.sin_port = htons(pm_mnt.pm_port);
|
---|
| 1374 | msock = RPC_ANYSOCK;
|
---|
| 1375 |
|
---|
| 1376 | switch (pm_mnt.pm_prot) {
|
---|
| 1377 | case IPPROTO_UDP:
|
---|
| 1378 | mclient = clntudp_create(&mount_server_addr,
|
---|
| 1379 | pm_mnt.pm_prog,
|
---|
| 1380 | pm_mnt.pm_vers,
|
---|
| 1381 | retry_timeout,
|
---|
| 1382 | &msock);
|
---|
| 1383 | if (mclient)
|
---|
| 1384 | break;
|
---|
| 1385 | mount_server_addr.sin_port = htons(pm_mnt.pm_port);
|
---|
| 1386 | msock = RPC_ANYSOCK;
|
---|
| 1387 | case IPPROTO_TCP:
|
---|
| 1388 | mclient = clnttcp_create(&mount_server_addr,
|
---|
| 1389 | pm_mnt.pm_prog,
|
---|
| 1390 | pm_mnt.pm_vers,
|
---|
| 1391 | &msock, 0, 0);
|
---|
| 1392 | break;
|
---|
| 1393 | default:
|
---|
| 1394 | mclient = NULL;
|
---|
| 1395 | }
|
---|
| 1396 | if (!mclient) {
|
---|
| 1397 | if (!daemonized && prevt == 0)
|
---|
| 1398 | error_msg_rpc(clnt_spcreateerror(" "));
|
---|
| 1399 | } else {
|
---|
| 1400 | enum clnt_stat clnt_stat;
|
---|
| 1401 |
|
---|
| 1402 | /* Try to mount hostname:pathname */
|
---|
| 1403 | mclient->cl_auth = authunix_create_default();
|
---|
| 1404 |
|
---|
| 1405 | /* Make pointers in xdr_mountres3 NULL so
|
---|
| 1406 | * that xdr_array allocates memory for us
|
---|
| 1407 | */
|
---|
| 1408 | memset(&status, 0, sizeof(status));
|
---|
| 1409 |
|
---|
| 1410 | if (pm_mnt.pm_vers == 3)
|
---|
| 1411 | clnt_stat = clnt_call(mclient, MOUNTPROC3_MNT,
|
---|
| 1412 | (xdrproc_t) xdr_dirpath,
|
---|
| 1413 | (caddr_t) &pathname,
|
---|
| 1414 | (xdrproc_t) xdr_mountres3,
|
---|
| 1415 | (caddr_t) &status,
|
---|
| 1416 | total_timeout);
|
---|
| 1417 | else
|
---|
| 1418 | clnt_stat = clnt_call(mclient, MOUNTPROC_MNT,
|
---|
| 1419 | (xdrproc_t) xdr_dirpath,
|
---|
| 1420 | (caddr_t) &pathname,
|
---|
| 1421 | (xdrproc_t) xdr_fhstatus,
|
---|
| 1422 | (caddr_t) &status,
|
---|
| 1423 | total_timeout);
|
---|
| 1424 |
|
---|
| 1425 | if (clnt_stat == RPC_SUCCESS)
|
---|
| 1426 | goto prepare_kernel_data; /* we're done */
|
---|
| 1427 | if (errno != ECONNREFUSED) {
|
---|
| 1428 | error_msg_rpc(clnt_sperror(mclient, " "));
|
---|
| 1429 | goto fail; /* don't retry */
|
---|
| 1430 | }
|
---|
| 1431 | /* Connection refused */
|
---|
| 1432 | if (!daemonized && prevt == 0) /* print just once */
|
---|
| 1433 | error_msg_rpc(clnt_sperror(mclient, " "));
|
---|
| 1434 | auth_destroy(mclient->cl_auth);
|
---|
| 1435 | clnt_destroy(mclient);
|
---|
| 1436 | mclient = NULL;
|
---|
| 1437 | close(msock);
|
---|
| 1438 | msock = -1;
|
---|
| 1439 | }
|
---|
| 1440 |
|
---|
| 1441 | /* Timeout. We are going to retry... maybe */
|
---|
| 1442 | if (!bg)
|
---|
| 1443 | goto fail;
|
---|
| 1444 | if (!daemonized) {
|
---|
| 1445 | daemonized = daemonize();
|
---|
| 1446 | if (daemonized <= 0) { /* parent or error */
|
---|
| 1447 | retval = -daemonized;
|
---|
| 1448 | goto ret;
|
---|
| 1449 | }
|
---|
| 1450 | }
|
---|
| 1451 | prevt = t;
|
---|
| 1452 | t = time(NULL);
|
---|
| 1453 | if (t >= timeout)
|
---|
| 1454 | /* TODO error message */
|
---|
| 1455 | goto fail;
|
---|
| 1456 |
|
---|
| 1457 | goto retry;
|
---|
| 1458 | }
|
---|
| 1459 |
|
---|
| 1460 | prepare_kernel_data:
|
---|
| 1461 |
|
---|
| 1462 | if (nfsvers == 2) {
|
---|
| 1463 | if (status.nfsv2.fhs_status != 0) {
|
---|
| 1464 | bb_error_msg("%s:%s failed, reason given by server: %s",
|
---|
| 1465 | hostname, pathname,
|
---|
| 1466 | nfs_strerror(status.nfsv2.fhs_status));
|
---|
| 1467 | goto fail;
|
---|
| 1468 | }
|
---|
| 1469 | memcpy(data.root.data,
|
---|
| 1470 | (char *) status.nfsv2.fhstatus_u.fhs_fhandle,
|
---|
| 1471 | NFS_FHSIZE);
|
---|
| 1472 | data.root.size = NFS_FHSIZE;
|
---|
| 1473 | memcpy(data.old_root.data,
|
---|
| 1474 | (char *) status.nfsv2.fhstatus_u.fhs_fhandle,
|
---|
| 1475 | NFS_FHSIZE);
|
---|
| 1476 | } else {
|
---|
| 1477 | fhandle3 *my_fhandle;
|
---|
| 1478 | if (status.nfsv3.fhs_status != 0) {
|
---|
| 1479 | bb_error_msg("%s:%s failed, reason given by server: %s",
|
---|
| 1480 | hostname, pathname,
|
---|
| 1481 | nfs_strerror(status.nfsv3.fhs_status));
|
---|
| 1482 | goto fail;
|
---|
| 1483 | }
|
---|
| 1484 | my_fhandle = &status.nfsv3.mountres3_u.mountinfo.fhandle;
|
---|
| 1485 | memset(data.old_root.data, 0, NFS_FHSIZE);
|
---|
| 1486 | memset(&data.root, 0, sizeof(data.root));
|
---|
| 1487 | data.root.size = my_fhandle->fhandle3_len;
|
---|
| 1488 | memcpy(data.root.data,
|
---|
| 1489 | (char *) my_fhandle->fhandle3_val,
|
---|
| 1490 | my_fhandle->fhandle3_len);
|
---|
| 1491 |
|
---|
| 1492 | data.flags |= NFS_MOUNT_VER3;
|
---|
| 1493 | }
|
---|
| 1494 |
|
---|
| 1495 | /* Create nfs socket for kernel */
|
---|
| 1496 | if (tcp) {
|
---|
| 1497 | if (nfs_mount_version < 3) {
|
---|
| 1498 | bb_error_msg("NFS over TCP is not supported");
|
---|
| 1499 | goto fail;
|
---|
| 1500 | }
|
---|
| 1501 | fsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
|
---|
| 1502 | } else
|
---|
| 1503 | fsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
|
---|
| 1504 | if (fsock < 0) {
|
---|
| 1505 | bb_perror_msg("nfs socket");
|
---|
| 1506 | goto fail;
|
---|
| 1507 | }
|
---|
| 1508 | if (bindresvport(fsock, 0) < 0) {
|
---|
| 1509 | bb_perror_msg("nfs bindresvport");
|
---|
| 1510 | goto fail;
|
---|
| 1511 | }
|
---|
| 1512 | if (port == 0) {
|
---|
| 1513 | server_addr.sin_port = PMAPPORT;
|
---|
| 1514 | port = pmap_getport(&server_addr, nfsprog, nfsvers,
|
---|
| 1515 | tcp ? IPPROTO_TCP : IPPROTO_UDP);
|
---|
| 1516 | if (port == 0)
|
---|
| 1517 | port = NFS_PORT;
|
---|
| 1518 | }
|
---|
| 1519 | server_addr.sin_port = htons(port);
|
---|
| 1520 |
|
---|
| 1521 | /* Prepare data structure for kernel */
|
---|
| 1522 | data.fd = fsock;
|
---|
| 1523 | memcpy((char *) &data.addr, (char *) &server_addr, sizeof(data.addr));
|
---|
| 1524 | strncpy(data.hostname, hostname, sizeof(data.hostname));
|
---|
| 1525 |
|
---|
| 1526 | /* Clean up */
|
---|
| 1527 | auth_destroy(mclient->cl_auth);
|
---|
| 1528 | clnt_destroy(mclient);
|
---|
| 1529 | close(msock);
|
---|
| 1530 | msock = -1;
|
---|
| 1531 |
|
---|
| 1532 | if (bg) {
|
---|
| 1533 | /* We must wait until mount directory is available */
|
---|
| 1534 | struct stat statbuf;
|
---|
| 1535 | int delay = 1;
|
---|
| 1536 | while (stat(mp->mnt_dir, &statbuf) == -1) {
|
---|
| 1537 | if (!daemonized) {
|
---|
| 1538 | daemonized = daemonize();
|
---|
| 1539 | if (daemonized <= 0) { /* parent or error */
|
---|
| 1540 | /* FIXME: parent doesn't close fsock - ??! */
|
---|
| 1541 | retval = -daemonized;
|
---|
| 1542 | goto ret;
|
---|
| 1543 | }
|
---|
| 1544 | }
|
---|
| 1545 | sleep(delay); /* 1, 2, 4, 8, 16, 30, ... */
|
---|
| 1546 | delay *= 2;
|
---|
| 1547 | if (delay > 30)
|
---|
| 1548 | delay = 30;
|
---|
| 1549 | }
|
---|
| 1550 | }
|
---|
| 1551 |
|
---|
| 1552 | /* Perform actual mount */
|
---|
| 1553 | do_mount:
|
---|
| 1554 | mp->mnt_type = (char*)"nfs";
|
---|
| 1555 | retval = mount_it_now(mp, vfsflags, (char*)&data);
|
---|
| 1556 | goto ret;
|
---|
| 1557 |
|
---|
| 1558 | /* Abort */
|
---|
| 1559 | fail:
|
---|
| 1560 | if (msock >= 0) {
|
---|
| 1561 | if (mclient) {
|
---|
| 1562 | auth_destroy(mclient->cl_auth);
|
---|
| 1563 | clnt_destroy(mclient);
|
---|
| 1564 | }
|
---|
| 1565 | close(msock);
|
---|
| 1566 | }
|
---|
| 1567 | if (fsock >= 0)
|
---|
| 1568 | close(fsock);
|
---|
| 1569 |
|
---|
| 1570 | ret:
|
---|
| 1571 | free(hostname);
|
---|
| 1572 | free(mounthost);
|
---|
| 1573 | free(filteropts);
|
---|
| 1574 | return retval;
|
---|
| 1575 | }
|
---|
| 1576 |
|
---|
| 1577 | #else // !ENABLE_FEATURE_MOUNT_NFS
|
---|
| 1578 |
|
---|
| 1579 | // Never called. Call should be optimized out.
|
---|
| 1580 | int nfsmount(struct mntent *mp, long vfsflags, char *filteropts);
|
---|
| 1581 |
|
---|
| 1582 | #endif // !ENABLE_FEATURE_MOUNT_NFS
|
---|
| 1583 |
|
---|
| 1584 | // Mount one directory. Handles CIFS, NFS, loopback, autobind, and filesystem
|
---|
| 1585 | // type detection. Returns 0 for success, nonzero for failure.
|
---|
| 1586 | // NB: mp->xxx fields may be trashed on exit
|
---|
| 1587 | static int singlemount(struct mntent *mp, int ignore_busy)
|
---|
| 1588 | {
|
---|
| 1589 | int rc = -1;
|
---|
| 1590 | long vfsflags;
|
---|
| 1591 | char *loopFile = NULL, *filteropts = NULL;
|
---|
| 1592 | llist_t *fl = NULL;
|
---|
| 1593 | struct stat st;
|
---|
| 1594 |
|
---|
| 1595 | errno = 0;
|
---|
| 1596 |
|
---|
| 1597 | vfsflags = parse_mount_options(mp->mnt_opts, &filteropts);
|
---|
| 1598 |
|
---|
| 1599 | // Treat fstype "auto" as unspecified
|
---|
| 1600 | if (mp->mnt_type && strcmp(mp->mnt_type, "auto") == 0)
|
---|
| 1601 | mp->mnt_type = NULL;
|
---|
| 1602 |
|
---|
| 1603 | // Might this be a virtual filesystem?
|
---|
| 1604 | if (ENABLE_FEATURE_MOUNT_HELPERS && strchr(mp->mnt_fsname, '#')) {
|
---|
| 1605 | char *args[35];
|
---|
| 1606 | char *s;
|
---|
| 1607 | int n;
|
---|
| 1608 | // fsname: "cmd#arg1#arg2..."
|
---|
| 1609 | // WARNING: allows execution of arbitrary commands!
|
---|
| 1610 | // Try "mount 'sh#-c#sh' bogus_dir".
|
---|
| 1611 | // It is safe ONLY because non-root
|
---|
| 1612 | // cannot use two-argument mount command
|
---|
| 1613 | // and using one-argument "mount 'sh#-c#sh'" doesn't work:
|
---|
| 1614 | // "mount: can't find sh#-c#sh in /etc/fstab"
|
---|
| 1615 | // (if /etc/fstab has it, it's ok: root sets up /etc/fstab).
|
---|
| 1616 |
|
---|
| 1617 | s = mp->mnt_fsname;
|
---|
| 1618 | n = 0;
|
---|
| 1619 | args[n++] = s;
|
---|
| 1620 | while (*s && n < 35 - 2) {
|
---|
| 1621 | if (*s++ == '#' && *s != '#') {
|
---|
| 1622 | s[-1] = '\0';
|
---|
| 1623 | args[n++] = s;
|
---|
| 1624 | }
|
---|
| 1625 | }
|
---|
| 1626 | args[n++] = mp->mnt_dir;
|
---|
| 1627 | args[n] = NULL;
|
---|
| 1628 | rc = spawn_and_wait(args);
|
---|
| 1629 | goto report_error;
|
---|
| 1630 | }
|
---|
| 1631 |
|
---|
| 1632 | // Might this be an CIFS filesystem?
|
---|
| 1633 | if (ENABLE_FEATURE_MOUNT_CIFS
|
---|
| 1634 | && (!mp->mnt_type || strcmp(mp->mnt_type, "cifs") == 0)
|
---|
| 1635 | && (mp->mnt_fsname[0] == '/' || mp->mnt_fsname[0] == '\\')
|
---|
| 1636 | && mp->mnt_fsname[0] == mp->mnt_fsname[1]
|
---|
| 1637 | ) {
|
---|
| 1638 | int len;
|
---|
| 1639 | char c;
|
---|
| 1640 | len_and_sockaddr *lsa;
|
---|
| 1641 | char *hostname, *dotted, *ip;
|
---|
| 1642 |
|
---|
| 1643 | hostname = mp->mnt_fsname + 2;
|
---|
| 1644 | len = strcspn(hostname, "/\\");
|
---|
| 1645 | if (len == 0 || hostname[len] == '\0')
|
---|
| 1646 | goto report_error;
|
---|
| 1647 | c = hostname[len];
|
---|
| 1648 | hostname[len] = '\0';
|
---|
| 1649 | lsa = host2sockaddr(hostname, 0);
|
---|
| 1650 | hostname[len] = c;
|
---|
| 1651 | if (!lsa)
|
---|
| 1652 | goto report_error;
|
---|
| 1653 |
|
---|
| 1654 | // Insert "ip=..." option into options
|
---|
| 1655 | dotted = xmalloc_sockaddr2dotted_noport(&lsa->u.sa);
|
---|
| 1656 | if (ENABLE_FEATURE_CLEAN_UP) free(lsa);
|
---|
| 1657 | ip = xasprintf("ip=%s", dotted);
|
---|
| 1658 | if (ENABLE_FEATURE_CLEAN_UP) free(dotted);
|
---|
| 1659 | parse_mount_options(ip, &filteropts);
|
---|
| 1660 | if (ENABLE_FEATURE_CLEAN_UP) free(ip);
|
---|
| 1661 |
|
---|
| 1662 | // "-o mand" is required [why?]
|
---|
| 1663 | vfsflags |= MS_MANDLOCK;
|
---|
| 1664 | mp->mnt_type = (char*)"cifs";
|
---|
| 1665 | rc = mount_it_now(mp, vfsflags, filteropts);
|
---|
| 1666 |
|
---|
| 1667 | goto report_error;
|
---|
| 1668 | }
|
---|
| 1669 |
|
---|
| 1670 | // Might this be an NFS filesystem?
|
---|
| 1671 | if (ENABLE_FEATURE_MOUNT_NFS
|
---|
| 1672 | && (!mp->mnt_type || strcmp(mp->mnt_type, "nfs") == 0)
|
---|
| 1673 | && strchr(mp->mnt_fsname, ':') != NULL
|
---|
| 1674 | ) {
|
---|
| 1675 | rc = nfsmount(mp, vfsflags, filteropts);
|
---|
| 1676 | goto report_error;
|
---|
| 1677 | }
|
---|
| 1678 |
|
---|
| 1679 | // Look at the file. (Not found isn't a failure for remount, or for
|
---|
| 1680 | // a synthetic filesystem like proc or sysfs.)
|
---|
| 1681 | // (We use stat, not lstat, in order to allow
|
---|
| 1682 | // mount symlink_to_file_or_blkdev dir)
|
---|
| 1683 | if (!stat(mp->mnt_fsname, &st)
|
---|
| 1684 | && !(vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE))
|
---|
| 1685 | ) {
|
---|
| 1686 | // Do we need to allocate a loopback device for it?
|
---|
| 1687 | if (ENABLE_FEATURE_MOUNT_LOOP && S_ISREG(st.st_mode)) {
|
---|
| 1688 | loopFile = bb_simplify_path(mp->mnt_fsname);
|
---|
| 1689 | mp->mnt_fsname = NULL; // will receive malloced loop dev name
|
---|
| 1690 | if (set_loop(&mp->mnt_fsname, loopFile, 0) < 0) {
|
---|
| 1691 | if (errno == EPERM || errno == EACCES)
|
---|
| 1692 | bb_error_msg(bb_msg_perm_denied_are_you_root);
|
---|
| 1693 | else
|
---|
| 1694 | bb_perror_msg("can't setup loop device");
|
---|
| 1695 | return errno;
|
---|
| 1696 | }
|
---|
| 1697 |
|
---|
| 1698 | // Autodetect bind mounts
|
---|
| 1699 | } else if (S_ISDIR(st.st_mode) && !mp->mnt_type)
|
---|
| 1700 | vfsflags |= MS_BIND;
|
---|
| 1701 | }
|
---|
| 1702 |
|
---|
| 1703 | // If we know the fstype (or don't need to), jump straight
|
---|
| 1704 | // to the actual mount.
|
---|
| 1705 | if (mp->mnt_type || (vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE))) {
|
---|
| 1706 | rc = mount_it_now(mp, vfsflags, filteropts);
|
---|
| 1707 | } else {
|
---|
| 1708 | // Loop through filesystem types until mount succeeds
|
---|
| 1709 | // or we run out
|
---|
| 1710 |
|
---|
| 1711 | // Initialize list of block backed filesystems.
|
---|
| 1712 | // This has to be done here so that during "mount -a",
|
---|
| 1713 | // mounts after /proc shows up can autodetect.
|
---|
| 1714 | if (!fslist) {
|
---|
| 1715 | fslist = get_block_backed_filesystems();
|
---|
| 1716 | if (ENABLE_FEATURE_CLEAN_UP && fslist)
|
---|
| 1717 | atexit(delete_block_backed_filesystems);
|
---|
| 1718 | }
|
---|
| 1719 |
|
---|
| 1720 | for (fl = fslist; fl; fl = fl->link) {
|
---|
| 1721 | mp->mnt_type = fl->data;
|
---|
| 1722 | rc = mount_it_now(mp, vfsflags, filteropts);
|
---|
| 1723 | if (!rc)
|
---|
| 1724 | break;
|
---|
| 1725 | }
|
---|
| 1726 | }
|
---|
| 1727 |
|
---|
| 1728 | // If mount failed, clean up loop file (if any).
|
---|
| 1729 | if (ENABLE_FEATURE_MOUNT_LOOP && rc && loopFile) {
|
---|
| 1730 | del_loop(mp->mnt_fsname);
|
---|
| 1731 | if (ENABLE_FEATURE_CLEAN_UP) {
|
---|
| 1732 | free(loopFile);
|
---|
| 1733 | free(mp->mnt_fsname);
|
---|
| 1734 | }
|
---|
| 1735 | }
|
---|
| 1736 |
|
---|
| 1737 | report_error:
|
---|
| 1738 | if (ENABLE_FEATURE_CLEAN_UP)
|
---|
| 1739 | free(filteropts);
|
---|
| 1740 |
|
---|
| 1741 | if (errno == EBUSY && ignore_busy)
|
---|
| 1742 | return 0;
|
---|
| 1743 | if (rc != 0)
|
---|
| 1744 | bb_perror_msg("mounting %s on %s failed", mp->mnt_fsname, mp->mnt_dir);
|
---|
| 1745 | return rc;
|
---|
| 1746 | }
|
---|
| 1747 |
|
---|
| 1748 | // -O support
|
---|
| 1749 | // -O interprets a list of filter options which select whether a mount
|
---|
| 1750 | // point will be mounted: only mounts with options matching *all* filtering
|
---|
| 1751 | // options will be selected.
|
---|
| 1752 | // By default each -O filter option must be present in the list of mount
|
---|
| 1753 | // options, but if it is prefixed by "no" then it must be absent.
|
---|
| 1754 | // For example,
|
---|
| 1755 | // -O a,nob,c matches -o a,c but fails to match -o a,b,c
|
---|
| 1756 | // (and also fails to match -o a because -o c is absent).
|
---|
| 1757 | //
|
---|
| 1758 | // It is different from -t in that each option is matched exactly; a leading
|
---|
| 1759 | // "no" at the beginning of one option does not negate the rest.
|
---|
| 1760 | static int match_opt(const char *fs_opt_in, const char *O_opt)
|
---|
| 1761 | {
|
---|
| 1762 | if (!O_opt)
|
---|
| 1763 | return 1;
|
---|
| 1764 |
|
---|
| 1765 | while (*O_opt) {
|
---|
| 1766 | const char *fs_opt = fs_opt_in;
|
---|
| 1767 | int O_len;
|
---|
| 1768 | int match;
|
---|
| 1769 |
|
---|
| 1770 | // If option begins with "no" then treat as an inverted match:
|
---|
| 1771 | // matching is a failure
|
---|
| 1772 | match = 0;
|
---|
| 1773 | if (O_opt[0] == 'n' && O_opt[1] == 'o') {
|
---|
| 1774 | match = 1;
|
---|
| 1775 | O_opt += 2;
|
---|
| 1776 | }
|
---|
| 1777 | // Isolate the current O option
|
---|
| 1778 | O_len = strchrnul(O_opt, ',') - O_opt;
|
---|
| 1779 | // Check for a match against existing options
|
---|
| 1780 | while (1) {
|
---|
| 1781 | if (strncmp(fs_opt, O_opt, O_len) == 0
|
---|
| 1782 | && (fs_opt[O_len] == '\0' || fs_opt[O_len] == ',')
|
---|
| 1783 | ) {
|
---|
| 1784 | if (match)
|
---|
| 1785 | return 0; // "no" prefix, but option found
|
---|
| 1786 | match = 1; // current O option found, go check next one
|
---|
| 1787 | break;
|
---|
| 1788 | }
|
---|
| 1789 | fs_opt = strchr(fs_opt, ',');
|
---|
| 1790 | if (!fs_opt)
|
---|
| 1791 | break;
|
---|
| 1792 | fs_opt++;
|
---|
| 1793 | }
|
---|
| 1794 | if (match == 0)
|
---|
| 1795 | return 0; // match wanted but not found
|
---|
| 1796 | if (O_opt[O_len] == '\0') // end?
|
---|
| 1797 | break;
|
---|
| 1798 | // Step to the next O option
|
---|
| 1799 | O_opt += O_len + 1;
|
---|
| 1800 | }
|
---|
| 1801 | // If we get here then everything matched
|
---|
| 1802 | return 1;
|
---|
| 1803 | }
|
---|
| 1804 |
|
---|
| 1805 | // Parse options, if necessary parse fstab/mtab, and call singlemount for
|
---|
| 1806 | // each directory to be mounted.
|
---|
| 1807 | int mount_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
| 1808 | int mount_main(int argc UNUSED_PARAM, char **argv)
|
---|
| 1809 | {
|
---|
| 1810 | char *cmdopts = xzalloc(1);
|
---|
| 1811 | char *fstype = NULL;
|
---|
| 1812 | char *O_optmatch = NULL;
|
---|
| 1813 | char *storage_path;
|
---|
| 1814 | llist_t *lst_o = NULL;
|
---|
| 1815 | const char *fstabname;
|
---|
| 1816 | FILE *fstab;
|
---|
| 1817 | int i, j;
|
---|
| 1818 | int rc = EXIT_SUCCESS;
|
---|
| 1819 | unsigned opt;
|
---|
| 1820 | struct mntent mtpair[2], *mtcur = mtpair;
|
---|
| 1821 | IF_NOT_DESKTOP(const int nonroot = 0;)
|
---|
| 1822 |
|
---|
| 1823 | IF_DESKTOP(int nonroot = ) sanitize_env_if_suid();
|
---|
| 1824 |
|
---|
| 1825 | // Parse long options, like --bind and --move. Note that -o option
|
---|
| 1826 | // and --option are synonymous. Yes, this means --remount,rw works.
|
---|
| 1827 | for (i = j = 1; argv[i]; i++) {
|
---|
| 1828 | if (argv[i][0] == '-' && argv[i][1] == '-')
|
---|
| 1829 | append_mount_options(&cmdopts, argv[i] + 2);
|
---|
| 1830 | else
|
---|
| 1831 | argv[j++] = argv[i];
|
---|
| 1832 | }
|
---|
| 1833 | argv[j] = NULL;
|
---|
| 1834 |
|
---|
| 1835 | // Parse remaining options
|
---|
| 1836 | // Max 2 params; -o is a list, -v is a counter
|
---|
| 1837 | opt_complementary = "?2o::" IF_FEATURE_MOUNT_VERBOSE("vv");
|
---|
| 1838 | opt = getopt32(argv, OPTION_STR, &lst_o, &fstype, &O_optmatch
|
---|
| 1839 | IF_FEATURE_MOUNT_VERBOSE(, &verbose));
|
---|
| 1840 | while (lst_o) append_mount_options(&cmdopts, llist_pop(&lst_o)); // -o
|
---|
| 1841 | if (opt & OPT_r) append_mount_options(&cmdopts, "ro"); // -r
|
---|
| 1842 | if (opt & OPT_w) append_mount_options(&cmdopts, "rw"); // -w
|
---|
| 1843 | argv += optind;
|
---|
| 1844 |
|
---|
| 1845 | // If we have no arguments, show currently mounted filesystems
|
---|
| 1846 | if (!argv[0]) {
|
---|
| 1847 | if (!(opt & OPT_a)) {
|
---|
| 1848 | FILE *mountTable = setmntent(bb_path_mtab_file, "r");
|
---|
| 1849 |
|
---|
| 1850 | if (!mountTable)
|
---|
| 1851 | bb_error_msg_and_die("no %s", bb_path_mtab_file);
|
---|
| 1852 |
|
---|
| 1853 | while (getmntent_r(mountTable, &mtpair[0], getmntent_buf,
|
---|
| 1854 | GETMNTENT_BUFSIZE))
|
---|
| 1855 | {
|
---|
| 1856 | // Don't show rootfs. FIXME: why??
|
---|
| 1857 | // util-linux 2.12a happily shows rootfs...
|
---|
| 1858 | //if (strcmp(mtpair->mnt_fsname, "rootfs") == 0) continue;
|
---|
| 1859 |
|
---|
| 1860 | if (!fstype || strcmp(mtpair->mnt_type, fstype) == 0)
|
---|
| 1861 | printf("%s on %s type %s (%s)\n", mtpair->mnt_fsname,
|
---|
| 1862 | mtpair->mnt_dir, mtpair->mnt_type,
|
---|
| 1863 | mtpair->mnt_opts);
|
---|
| 1864 | }
|
---|
| 1865 | if (ENABLE_FEATURE_CLEAN_UP)
|
---|
| 1866 | endmntent(mountTable);
|
---|
| 1867 | return EXIT_SUCCESS;
|
---|
| 1868 | }
|
---|
| 1869 | storage_path = NULL;
|
---|
| 1870 | } else {
|
---|
| 1871 | // When we have two arguments, the second is the directory and we can
|
---|
| 1872 | // skip looking at fstab entirely. We can always abspath() the directory
|
---|
| 1873 | // argument when we get it.
|
---|
| 1874 | if (argv[1]) {
|
---|
| 1875 | if (nonroot)
|
---|
| 1876 | bb_error_msg_and_die(bb_msg_you_must_be_root);
|
---|
| 1877 | mtpair->mnt_fsname = argv[0];
|
---|
| 1878 | mtpair->mnt_dir = argv[1];
|
---|
| 1879 | mtpair->mnt_type = fstype;
|
---|
| 1880 | mtpair->mnt_opts = cmdopts;
|
---|
| 1881 | resolve_mount_spec(&mtpair->mnt_fsname);
|
---|
| 1882 | rc = singlemount(mtpair, /*ignore_busy:*/ 0);
|
---|
| 1883 | return rc;
|
---|
| 1884 | }
|
---|
| 1885 | storage_path = bb_simplify_path(argv[0]); // malloced
|
---|
| 1886 | }
|
---|
| 1887 |
|
---|
| 1888 | // Past this point, we are handling either "mount -a [opts]"
|
---|
| 1889 | // or "mount [opts] single_param"
|
---|
| 1890 |
|
---|
| 1891 | i = parse_mount_options(cmdopts, NULL); // FIXME: should be "long", not "int"
|
---|
| 1892 | if (nonroot && (i & ~MS_SILENT)) // Non-root users cannot specify flags
|
---|
| 1893 | bb_error_msg_and_die(bb_msg_you_must_be_root);
|
---|
| 1894 |
|
---|
| 1895 | // If we have a shared subtree flag, don't worry about fstab or mtab.
|
---|
| 1896 | if (ENABLE_FEATURE_MOUNT_FLAGS
|
---|
| 1897 | && (i & (MS_SHARED | MS_PRIVATE | MS_SLAVE | MS_UNBINDABLE))
|
---|
| 1898 | ) {
|
---|
| 1899 | // verbose_mount(source, target, type, flags, data)
|
---|
| 1900 | rc = verbose_mount("", argv[0], "", i, "");
|
---|
| 1901 | if (rc)
|
---|
| 1902 | bb_simple_perror_msg_and_die(argv[0]);
|
---|
| 1903 | return rc;
|
---|
| 1904 | }
|
---|
| 1905 |
|
---|
| 1906 | // Open either fstab or mtab
|
---|
| 1907 | fstabname = "/etc/fstab";
|
---|
| 1908 | if (i & MS_REMOUNT) {
|
---|
| 1909 | // WARNING. I am not sure this matches util-linux's
|
---|
| 1910 | // behavior. It's possible util-linux does not
|
---|
| 1911 | // take -o opts from mtab (takes only mount source).
|
---|
| 1912 | fstabname = bb_path_mtab_file;
|
---|
| 1913 | }
|
---|
| 1914 | fstab = setmntent(fstabname, "r");
|
---|
| 1915 | if (!fstab)
|
---|
| 1916 | bb_perror_msg_and_die("can't read '%s'", fstabname);
|
---|
| 1917 |
|
---|
| 1918 | // Loop through entries until we find what we're looking for
|
---|
| 1919 | memset(mtpair, 0, sizeof(mtpair));
|
---|
| 1920 | for (;;) {
|
---|
| 1921 | struct mntent *mtother = (mtcur==mtpair ? mtpair+1 : mtpair);
|
---|
| 1922 |
|
---|
| 1923 | // Get next fstab entry
|
---|
| 1924 | if (!getmntent_r(fstab, mtcur, getmntent_buf
|
---|
| 1925 | + (mtcur==mtpair ? GETMNTENT_BUFSIZE/2 : 0),
|
---|
| 1926 | GETMNTENT_BUFSIZE/2)
|
---|
| 1927 | ) { // End of fstab/mtab is reached
|
---|
| 1928 | mtcur = mtother; // the thing we found last time
|
---|
| 1929 | break;
|
---|
| 1930 | }
|
---|
| 1931 |
|
---|
| 1932 | // If we're trying to mount something specific and this isn't it,
|
---|
| 1933 | // skip it. Note we must match the exact text in fstab (ala
|
---|
| 1934 | // "proc") or a full path from root
|
---|
| 1935 | if (argv[0]) {
|
---|
| 1936 |
|
---|
| 1937 | // Is this what we're looking for?
|
---|
| 1938 | if (strcmp(argv[0], mtcur->mnt_fsname) != 0
|
---|
| 1939 | && strcmp(storage_path, mtcur->mnt_fsname) != 0
|
---|
| 1940 | && strcmp(argv[0], mtcur->mnt_dir) != 0
|
---|
| 1941 | && strcmp(storage_path, mtcur->mnt_dir) != 0
|
---|
| 1942 | ) {
|
---|
| 1943 | continue; // no
|
---|
| 1944 | }
|
---|
| 1945 |
|
---|
| 1946 | // Remember this entry. Something later may have
|
---|
| 1947 | // overmounted it, and we want the _last_ match.
|
---|
| 1948 | mtcur = mtother;
|
---|
| 1949 |
|
---|
| 1950 | // If we're mounting all
|
---|
| 1951 | } else {
|
---|
| 1952 | struct mntent *mp;
|
---|
| 1953 | // No, mount -a won't mount anything,
|
---|
| 1954 | // even user mounts, for mere humans
|
---|
| 1955 | if (nonroot)
|
---|
| 1956 | bb_error_msg_and_die(bb_msg_you_must_be_root);
|
---|
| 1957 |
|
---|
| 1958 | // Does type match? (NULL matches always)
|
---|
| 1959 | if (!match_fstype(mtcur, fstype))
|
---|
| 1960 | continue;
|
---|
| 1961 |
|
---|
| 1962 | // Skip noauto and swap anyway
|
---|
| 1963 | if ((parse_mount_options(mtcur->mnt_opts, NULL) & (MOUNT_NOAUTO | MOUNT_SWAP))
|
---|
| 1964 | // swap is bogus "fstype", parse_mount_options can't check fstypes
|
---|
| 1965 | || strcasecmp(mtcur->mnt_type, "swap") == 0
|
---|
| 1966 | ) {
|
---|
| 1967 | continue;
|
---|
| 1968 | }
|
---|
| 1969 |
|
---|
| 1970 | // Does (at least one) option match?
|
---|
| 1971 | // (NULL matches always)
|
---|
| 1972 | if (!match_opt(mtcur->mnt_opts, O_optmatch))
|
---|
| 1973 | continue;
|
---|
| 1974 |
|
---|
| 1975 | resolve_mount_spec(&mtcur->mnt_fsname);
|
---|
| 1976 |
|
---|
| 1977 | // NFS mounts want this to be xrealloc-able
|
---|
| 1978 | mtcur->mnt_opts = xstrdup(mtcur->mnt_opts);
|
---|
| 1979 |
|
---|
| 1980 | // If nothing is mounted on this directory...
|
---|
| 1981 | // (otherwise repeated "mount -a" mounts everything again)
|
---|
| 1982 | mp = find_mount_point(mtcur->mnt_dir, /*subdir_too:*/ 0);
|
---|
| 1983 | // We do not check fsname match of found mount point -
|
---|
| 1984 | // "/" may have fsname of "/dev/root" while fstab
|
---|
| 1985 | // says "/dev/something_else".
|
---|
| 1986 | if (mp) {
|
---|
| 1987 | if (verbose) {
|
---|
| 1988 | bb_error_msg("according to %s, "
|
---|
| 1989 | "%s is already mounted on %s",
|
---|
| 1990 | bb_path_mtab_file,
|
---|
| 1991 | mp->mnt_fsname, mp->mnt_dir);
|
---|
| 1992 | }
|
---|
| 1993 | } else {
|
---|
| 1994 | // ...mount this thing
|
---|
| 1995 | if (singlemount(mtcur, /*ignore_busy:*/ 1)) {
|
---|
| 1996 | // Count number of failed mounts
|
---|
| 1997 | rc++;
|
---|
| 1998 | }
|
---|
| 1999 | }
|
---|
| 2000 | free(mtcur->mnt_opts);
|
---|
| 2001 | }
|
---|
| 2002 | }
|
---|
| 2003 |
|
---|
| 2004 | // End of fstab/mtab is reached.
|
---|
| 2005 | // Were we looking for something specific?
|
---|
| 2006 | if (argv[0]) { // yes
|
---|
| 2007 | long l;
|
---|
| 2008 |
|
---|
| 2009 | // If we didn't find anything, complain
|
---|
| 2010 | if (!mtcur->mnt_fsname)
|
---|
| 2011 | bb_error_msg_and_die("can't find %s in %s",
|
---|
| 2012 | argv[0], fstabname);
|
---|
| 2013 |
|
---|
| 2014 | // What happens when we try to "mount swap_partition"?
|
---|
| 2015 | // (fstab containts "swap_partition swap swap defaults 0 0")
|
---|
| 2016 | // util-linux-ng 2.13.1 does this:
|
---|
| 2017 | // stat("/sbin/mount.swap", 0x7fff62a3a350) = -1 ENOENT (No such file or directory)
|
---|
| 2018 | // mount("swap_partition", "swap", "swap", MS_MGC_VAL, NULL) = -1 ENOENT (No such file or directory)
|
---|
| 2019 | // lstat("swap", 0x7fff62a3a640) = -1 ENOENT (No such file or directory)
|
---|
| 2020 | // write(2, "mount: mount point swap does not exist\n", 39) = 39
|
---|
| 2021 | // exit_group(32) = ?
|
---|
| 2022 | #if 0
|
---|
| 2023 | // In case we want to simply skip swap partitions:
|
---|
| 2024 | l = parse_mount_options(mtcur->mnt_opts, NULL);
|
---|
| 2025 | if ((l & MOUNT_SWAP)
|
---|
| 2026 | // swap is bogus "fstype", parse_mount_options can't check fstypes
|
---|
| 2027 | || strcasecmp(mtcur->mnt_type, "swap") == 0
|
---|
| 2028 | ) {
|
---|
| 2029 | goto ret;
|
---|
| 2030 | }
|
---|
| 2031 | #endif
|
---|
| 2032 | if (nonroot) {
|
---|
| 2033 | // fstab must have "users" or "user"
|
---|
| 2034 | l = parse_mount_options(mtcur->mnt_opts, NULL);
|
---|
| 2035 | if (!(l & MOUNT_USERS))
|
---|
| 2036 | bb_error_msg_and_die(bb_msg_you_must_be_root);
|
---|
| 2037 | }
|
---|
| 2038 |
|
---|
| 2039 | //util-linux-2.12 does not do this check.
|
---|
| 2040 | //// If nothing is mounted on this directory...
|
---|
| 2041 | //// (otherwise repeated "mount FOO" mounts FOO again)
|
---|
| 2042 | //mp = find_mount_point(mtcur->mnt_dir, /*subdir_too:*/ 0);
|
---|
| 2043 | //if (mp) {
|
---|
| 2044 | // bb_error_msg("according to %s, "
|
---|
| 2045 | // "%s is already mounted on %s",
|
---|
| 2046 | // bb_path_mtab_file,
|
---|
| 2047 | // mp->mnt_fsname, mp->mnt_dir);
|
---|
| 2048 | //} else {
|
---|
| 2049 | // ...mount the last thing we found
|
---|
| 2050 | mtcur->mnt_opts = xstrdup(mtcur->mnt_opts);
|
---|
| 2051 | append_mount_options(&(mtcur->mnt_opts), cmdopts);
|
---|
| 2052 | resolve_mount_spec(&mtpair->mnt_fsname);
|
---|
| 2053 | rc = singlemount(mtcur, /*ignore_busy:*/ 0);
|
---|
| 2054 | if (ENABLE_FEATURE_CLEAN_UP)
|
---|
| 2055 | free(mtcur->mnt_opts);
|
---|
| 2056 | //}
|
---|
| 2057 | }
|
---|
| 2058 |
|
---|
| 2059 | //ret:
|
---|
| 2060 | if (ENABLE_FEATURE_CLEAN_UP)
|
---|
| 2061 | endmntent(fstab);
|
---|
| 2062 | if (ENABLE_FEATURE_CLEAN_UP) {
|
---|
| 2063 | free(storage_path);
|
---|
| 2064 | free(cmdopts);
|
---|
| 2065 | }
|
---|
| 2066 |
|
---|
| 2067 | //TODO: exitcode should be ORed mask of (from "man mount"):
|
---|
| 2068 | // 0 success
|
---|
| 2069 | // 1 incorrect invocation or permissions
|
---|
| 2070 | // 2 system error (out of memory, cannot fork, no more loop devices)
|
---|
| 2071 | // 4 internal mount bug or missing nfs support in mount
|
---|
| 2072 | // 8 user interrupt
|
---|
| 2073 | //16 problems writing or locking /etc/mtab
|
---|
| 2074 | //32 mount failure
|
---|
| 2075 | //64 some mount succeeded
|
---|
| 2076 | return rc;
|
---|
| 2077 | }
|
---|