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 |
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20 | //config:config MOUNT
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21 | //config: bool "mount"
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22 | //config: default y
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23 | //config: select PLATFORM_LINUX
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24 | //config: help
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25 | //config: All files and filesystems in Unix are arranged into one big directory
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26 | //config: tree. The 'mount' utility is used to graft a filesystem onto a
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27 | //config: particular part of the tree. A filesystem can either live on a block
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28 | //config: device, or it can be accessible over the network, as is the case with
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29 | //config: NFS filesystems. Most people using BusyBox will also want to enable
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30 | //config: the 'mount' utility.
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31 | //config:
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32 | //config:config FEATURE_MOUNT_FAKE
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33 | //config: bool "Support option -f"
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34 | //config: default y
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35 | //config: depends on MOUNT
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36 | //config: help
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37 | //config: Enable support for faking a file system mount.
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38 | //config:
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39 | //config:config FEATURE_MOUNT_VERBOSE
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40 | //config: bool "Support option -v"
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41 | //config: default y
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42 | //config: depends on MOUNT
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43 | //config: help
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44 | //config: Enable multi-level -v[vv...] verbose messages. Useful if you
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45 | //config: debug mount problems and want to see what is exactly passed
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46 | //config: to the kernel.
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47 | //config:
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48 | //config:config FEATURE_MOUNT_HELPERS
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49 | //config: bool "Support mount helpers"
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50 | //config: default n
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51 | //config: depends on MOUNT
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52 | //config: help
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53 | //config: Enable mounting of virtual file systems via external helpers.
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54 | //config: E.g. "mount obexfs#-b00.11.22.33.44.55 /mnt" will in effect call
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55 | //config: "obexfs -b00.11.22.33.44.55 /mnt"
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56 | //config: Also "mount -t sometype [-o opts] fs /mnt" will try
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57 | //config: "sometype [-o opts] fs /mnt" if simple mount syscall fails.
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58 | //config: The idea is to use such virtual filesystems in /etc/fstab.
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59 | //config:
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60 | //config:config FEATURE_MOUNT_LABEL
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61 | //config: bool "Support specifying devices by label or UUID"
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62 | //config: default y
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63 | //config: depends on MOUNT
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64 | //config: select VOLUMEID
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65 | //config: help
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66 | //config: This allows for specifying a device by label or uuid, rather than by
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67 | //config: name. This feature utilizes the same functionality as blkid/findfs.
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68 | //config: This also enables label or uuid support for swapon.
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69 | //config:
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70 | //config:config FEATURE_MOUNT_NFS
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71 | //config: bool "Support mounting NFS file systems on Linux < 2.6.23"
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72 | //config: default n
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73 | //config: depends on MOUNT
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74 | //config: select FEATURE_HAVE_RPC
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75 | //config: select FEATURE_SYSLOG
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76 | //config: help
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77 | //config: Enable mounting of NFS file systems on Linux kernels prior
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78 | //config: to version 2.6.23. Note that in this case mounting of NFS
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79 | //config: over IPv6 will not be possible.
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80 | //config:
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81 | //config: Note that this option links in RPC support from libc,
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82 | //config: which is rather large (~10 kbytes on uclibc).
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83 | //config:
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84 | //config:config FEATURE_MOUNT_CIFS
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85 | //config: bool "Support mounting CIFS/SMB file systems"
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86 | //config: default y
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87 | //config: depends on MOUNT
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88 | //config: help
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89 | //config: Enable support for samba mounts.
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90 | //config:
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91 | //config:config FEATURE_MOUNT_FLAGS
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92 | //config: depends on MOUNT
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93 | //config: bool "Support lots of -o flags in mount"
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94 | //config: default y
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95 | //config: help
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96 | //config: Without this, mount only supports ro/rw/remount. With this, it
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97 | //config: supports nosuid, suid, dev, nodev, exec, noexec, sync, async, atime,
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98 | //config: noatime, diratime, nodiratime, loud, bind, move, shared, slave,
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99 | //config: private, unbindable, rshared, rslave, rprivate, and runbindable.
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100 | //config:
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101 | //config:config FEATURE_MOUNT_FSTAB
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102 | //config: depends on MOUNT
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103 | //config: bool "Support /etc/fstab and -a"
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104 | //config: default y
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105 | //config: help
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106 | //config: Support mount all and looking for files in /etc/fstab.
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107 | //config:
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108 | //config:config FEATURE_MOUNT_OTHERTAB
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109 | //config: depends on FEATURE_MOUNT_FSTAB
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110 | //config: bool "Support -T <alt_fstab>"
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111 | //config: default y
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112 | //config: help
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113 | //config: Support mount -T (specifying an alternate fstab)
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114 |
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115 | //usage:#define mount_trivial_usage
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116 | //usage: "[OPTIONS] [-o OPT] DEVICE NODE"
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117 | //usage:#define mount_full_usage "\n\n"
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118 | //usage: "Mount a filesystem. Filesystem autodetection requires /proc.\n"
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119 | //usage: "\n -a Mount all filesystems in fstab"
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120 | //usage: IF_FEATURE_MOUNT_FAKE(
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121 | //usage: IF_FEATURE_MTAB_SUPPORT(
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122 | //usage: "\n -f Update /etc/mtab, but don't mount"
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123 | //usage: )
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124 | //usage: IF_NOT_FEATURE_MTAB_SUPPORT(
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125 | //usage: "\n -f Dry run"
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126 | //usage: )
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127 | //usage: )
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128 | //usage: IF_FEATURE_MOUNT_HELPERS(
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129 | //usage: "\n -i Don't run mount helper"
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130 | //usage: )
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131 | //usage: IF_FEATURE_MTAB_SUPPORT(
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132 | //usage: "\n -n Don't update /etc/mtab"
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133 | //usage: )
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134 | //usage: IF_FEATURE_MOUNT_VERBOSE(
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135 | //usage: "\n -v Verbose"
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136 | //usage: )
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137 | ////usage: "\n -s Sloppy (ignored)"
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138 | //usage: "\n -r Read-only mount"
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139 | ////usage: "\n -w Read-write mount (default)"
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140 | //usage: "\n -t FSTYPE[,...] Filesystem type(s)"
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141 | //usage: IF_FEATURE_MOUNT_OTHERTAB(
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142 | //usage: "\n -T FILE Read FILE instead of /etc/fstab"
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143 | //usage: )
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144 | //usage: "\n -O OPT Mount only filesystems with option OPT (-a only)"
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145 | //usage: "\n-o OPT:"
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146 | //usage: IF_FEATURE_MOUNT_LOOP(
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147 | //usage: "\n loop Ignored (loop devices are autodetected)"
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148 | //usage: )
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149 | //usage: IF_FEATURE_MOUNT_FLAGS(
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150 | //usage: "\n [a]sync Writes are [a]synchronous"
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151 | //usage: "\n [no]atime Disable/enable updates to inode access times"
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152 | //usage: "\n [no]diratime Disable/enable atime updates to directories"
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153 | //usage: "\n [no]relatime Disable/enable atime updates relative to modification time"
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154 | //usage: "\n [no]dev (Dis)allow use of special device files"
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155 | //usage: "\n [no]exec (Dis)allow use of executable files"
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156 | //usage: "\n [no]suid (Dis)allow set-user-id-root programs"
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157 | //usage: "\n [r]shared Convert [recursively] to a shared subtree"
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158 | //usage: "\n [r]slave Convert [recursively] to a slave subtree"
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159 | //usage: "\n [r]private Convert [recursively] to a private subtree"
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160 | //usage: "\n [un]bindable Make mount point [un]able to be bind mounted"
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161 | //usage: "\n [r]bind Bind a file or directory [recursively] to another location"
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162 | //usage: "\n move Relocate an existing mount point"
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163 | //usage: )
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164 | //usage: "\n remount Remount a mounted filesystem, changing flags"
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165 | //usage: "\n ro Same as -r"
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166 | //usage: "\n"
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167 | //usage: "\nThere are filesystem-specific -o flags."
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168 | //usage:
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169 | //usage:#define mount_example_usage
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170 | //usage: "$ mount\n"
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171 | //usage: "/dev/hda3 on / type minix (rw)\n"
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172 | //usage: "proc on /proc type proc (rw)\n"
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173 | //usage: "devpts on /dev/pts type devpts (rw)\n"
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174 | //usage: "$ mount /dev/fd0 /mnt -t msdos -o ro\n"
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175 | //usage: "$ mount /tmp/diskimage /opt -t ext2 -o loop\n"
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176 | //usage: "$ mount cd_image.iso mydir\n"
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177 | //usage:#define mount_notes_usage
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178 | //usage: "Returns 0 for success, number of failed mounts for -a, or errno for one mount."
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179 |
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180 | #include <mntent.h>
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181 | #include <syslog.h>
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182 | #include <sys/mount.h>
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183 | // Grab more as needed from util-linux's mount/mount_constants.h
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184 | #ifndef MS_DIRSYNC
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185 | # define MS_DIRSYNC (1 << 7) // Directory modifications are synchronous
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186 | #endif
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187 | #ifndef MS_UNION
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188 | # define MS_UNION (1 << 8)
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189 | #endif
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190 | #ifndef MS_BIND
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191 | # define MS_BIND (1 << 12)
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192 | #endif
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193 | #ifndef MS_MOVE
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194 | # define MS_MOVE (1 << 13)
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195 | #endif
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196 | #ifndef MS_RECURSIVE
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197 | # define MS_RECURSIVE (1 << 14)
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198 | #endif
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199 | #ifndef MS_SILENT
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200 | # define MS_SILENT (1 << 15)
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201 | #endif
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202 | // The shared subtree stuff, which went in around 2.6.15
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203 | #ifndef MS_UNBINDABLE
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204 | # define MS_UNBINDABLE (1 << 17)
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205 | #endif
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206 | #ifndef MS_PRIVATE
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207 | # define MS_PRIVATE (1 << 18)
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208 | #endif
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209 | #ifndef MS_SLAVE
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210 | # define MS_SLAVE (1 << 19)
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211 | #endif
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212 | #ifndef MS_SHARED
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213 | # define MS_SHARED (1 << 20)
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214 | #endif
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215 | #ifndef MS_RELATIME
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216 | # define MS_RELATIME (1 << 21)
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217 | #endif
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218 | #ifndef MS_STRICTATIME
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219 | # define MS_STRICTATIME (1 << 24)
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220 | #endif
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221 |
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222 | /* Any ~MS_FOO value has this bit set: */
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223 | #define BB_MS_INVERTED_VALUE (1u << 31)
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224 |
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225 | #include "libbb.h"
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226 | #include "common_bufsiz.h"
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227 | #if ENABLE_FEATURE_MOUNT_LABEL
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228 | # include "volume_id.h"
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229 | #else
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230 | # define resolve_mount_spec(fsname) ((void)0)
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231 | #endif
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232 |
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233 | // Needed for nfs support only
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234 | #include <sys/utsname.h>
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235 | #undef TRUE
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236 | #undef FALSE
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237 | #if ENABLE_FEATURE_MOUNT_NFS
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238 | /* This is just a warning of a common mistake. Possibly this should be a
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239 | * uclibc faq entry rather than in busybox... */
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240 | # if defined(__UCLIBC__) && ! defined(__UCLIBC_HAS_RPC__)
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241 | # error "You need to build uClibc with UCLIBC_HAS_RPC for NFS support"
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242 | # endif
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243 | # include <rpc/rpc.h>
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244 | # include <rpc/pmap_prot.h>
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245 | # include <rpc/pmap_clnt.h>
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246 | #endif
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247 |
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248 |
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249 | #if defined(__dietlibc__)
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250 | // 16.12.2006, Sampo Kellomaki (sampo@iki.fi)
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251 | // dietlibc-0.30 does not have implementation of getmntent_r()
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252 | static struct mntent *getmntent_r(FILE* stream, struct mntent* result,
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253 | char* buffer UNUSED_PARAM, int bufsize UNUSED_PARAM)
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254 | {
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255 | struct mntent* ment = getmntent(stream);
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256 | return memcpy(result, ment, sizeof(*ment));
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257 | }
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258 | #endif
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259 |
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260 |
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261 | // Not real flags, but we want to be able to check for this.
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262 | enum {
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263 | MOUNT_USERS = (1 << 27) * ENABLE_DESKTOP,
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264 | MOUNT_NOFAIL = (1 << 28) * ENABLE_DESKTOP,
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265 | MOUNT_NOAUTO = (1 << 29),
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266 | MOUNT_SWAP = (1 << 30),
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267 | MOUNT_FAKEFLAGS = MOUNT_USERS | MOUNT_NOFAIL | MOUNT_NOAUTO | MOUNT_SWAP
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268 | };
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269 |
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270 |
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271 | #define OPTION_STR "o:t:rwanfvsiO:" IF_FEATURE_MOUNT_OTHERTAB("T:")
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272 | enum {
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273 | OPT_o = (1 << 0),
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274 | OPT_t = (1 << 1),
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275 | OPT_r = (1 << 2),
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276 | OPT_w = (1 << 3),
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277 | OPT_a = (1 << 4),
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278 | OPT_n = (1 << 5),
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279 | OPT_f = (1 << 6),
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280 | OPT_v = (1 << 7),
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281 | OPT_s = (1 << 8),
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282 | OPT_i = (1 << 9),
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283 | OPT_O = (1 << 10),
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284 | OPT_T = (1 << 11),
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285 | };
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286 |
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287 | #if ENABLE_FEATURE_MTAB_SUPPORT
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288 | #define USE_MTAB (!(option_mask32 & OPT_n))
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289 | #else
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290 | #define USE_MTAB 0
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291 | #endif
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292 |
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293 | #if ENABLE_FEATURE_MOUNT_FAKE
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294 | #define FAKE_IT (option_mask32 & OPT_f)
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295 | #else
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296 | #define FAKE_IT 0
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297 | #endif
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298 |
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299 | #if ENABLE_FEATURE_MOUNT_HELPERS
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300 | #define HELPERS_ALLOWED (!(option_mask32 & OPT_i))
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301 | #else
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302 | #define HELPERS_ALLOWED 0
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303 | #endif
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304 |
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305 |
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306 | // TODO: more "user" flag compatibility.
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307 | // "user" option (from mount manpage):
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308 | // Only the user that mounted a filesystem can unmount it again.
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309 | // If any user should be able to unmount, then use users instead of user
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310 | // in the fstab line. The owner option is similar to the user option,
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311 | // with the restriction that the user must be the owner of the special file.
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312 | // This may be useful e.g. for /dev/fd if a login script makes
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313 | // the console user owner of this device.
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314 |
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315 | // Standard mount options (from -o options or --options),
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316 | // with corresponding flags
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317 | static const int32_t mount_options[] = {
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318 | // MS_FLAGS set a bit. ~MS_FLAGS disable that bit. 0 flags are NOPs.
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319 |
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320 | IF_FEATURE_MOUNT_LOOP(
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321 | /* "loop" */ 0,
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322 | )
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323 |
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324 | IF_FEATURE_MOUNT_FSTAB(
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325 | /* "defaults" */ 0,
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326 | /* "quiet" 0 - do not filter out, vfat wants to see it */
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327 | /* "noauto" */ MOUNT_NOAUTO,
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328 | /* "sw" */ MOUNT_SWAP,
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329 | /* "swap" */ MOUNT_SWAP,
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330 | IF_DESKTOP(/* "user" */ MOUNT_USERS,)
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331 | IF_DESKTOP(/* "users" */ MOUNT_USERS,)
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332 | IF_DESKTOP(/* "nofail" */ MOUNT_NOFAIL,)
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333 | /* "_netdev" */ 0,
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334 | IF_DESKTOP(/* "comment=" */ 0,) /* systemd uses this in fstab */
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335 | )
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336 |
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337 | IF_FEATURE_MOUNT_FLAGS(
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338 | // vfs flags
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339 | /* "nosuid" */ MS_NOSUID,
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340 | /* "suid" */ ~MS_NOSUID,
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341 | /* "dev" */ ~MS_NODEV,
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342 | /* "nodev" */ MS_NODEV,
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343 | /* "exec" */ ~MS_NOEXEC,
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344 | /* "noexec" */ MS_NOEXEC,
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345 | /* "sync" */ MS_SYNCHRONOUS,
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346 | /* "dirsync" */ MS_DIRSYNC,
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347 | /* "async" */ ~MS_SYNCHRONOUS,
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348 | /* "atime" */ ~MS_NOATIME,
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349 | /* "noatime" */ MS_NOATIME,
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350 | /* "diratime" */ ~MS_NODIRATIME,
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351 | /* "nodiratime" */ MS_NODIRATIME,
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352 | /* "mand" */ MS_MANDLOCK,
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353 | /* "nomand" */ ~MS_MANDLOCK,
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354 | /* "relatime" */ MS_RELATIME,
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355 | /* "norelatime" */ ~MS_RELATIME,
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356 | /* "strictatime" */ MS_STRICTATIME,
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357 | /* "loud" */ ~MS_SILENT,
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358 | /* "rbind" */ MS_BIND|MS_RECURSIVE,
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359 |
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360 | // action flags
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361 | /* "union" */ MS_UNION,
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362 | /* "bind" */ MS_BIND,
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363 | /* "move" */ MS_MOVE,
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364 | /* "shared" */ MS_SHARED,
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365 | /* "slave" */ MS_SLAVE,
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366 | /* "private" */ MS_PRIVATE,
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367 | /* "unbindable" */ MS_UNBINDABLE,
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368 | /* "rshared" */ MS_SHARED|MS_RECURSIVE,
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369 | /* "rslave" */ MS_SLAVE|MS_RECURSIVE,
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370 | /* "rprivate" */ MS_PRIVATE|MS_RECURSIVE,
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371 | /* "runbindable" */ MS_UNBINDABLE|MS_RECURSIVE,
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372 | )
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373 |
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374 | // Always understood.
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375 | /* "ro" */ MS_RDONLY, // vfs flag
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376 | /* "rw" */ ~MS_RDONLY, // vfs flag
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377 | /* "remount" */ MS_REMOUNT // action flag
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378 | };
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379 |
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380 | static const char mount_option_str[] ALIGN1 =
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381 | IF_FEATURE_MOUNT_LOOP(
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382 | "loop\0"
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383 | )
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384 | IF_FEATURE_MOUNT_FSTAB(
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385 | "defaults\0"
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386 | // "quiet\0" - do not filter out, vfat wants to see it
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387 | "noauto\0"
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388 | "sw\0"
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389 | "swap\0"
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390 | IF_DESKTOP("user\0")
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391 | IF_DESKTOP("users\0")
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392 | IF_DESKTOP("nofail\0")
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393 | "_netdev\0"
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394 | IF_DESKTOP("comment=\0") /* systemd uses this in fstab */
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395 | )
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396 | IF_FEATURE_MOUNT_FLAGS(
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397 | // vfs flags
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398 | "nosuid\0"
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399 | "suid\0"
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400 | "dev\0"
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401 | "nodev\0"
|
---|
402 | "exec\0"
|
---|
403 | "noexec\0"
|
---|
404 | "sync\0"
|
---|
405 | "dirsync\0"
|
---|
406 | "async\0"
|
---|
407 | "atime\0"
|
---|
408 | "noatime\0"
|
---|
409 | "diratime\0"
|
---|
410 | "nodiratime\0"
|
---|
411 | "mand\0"
|
---|
412 | "nomand\0"
|
---|
413 | "relatime\0"
|
---|
414 | "norelatime\0"
|
---|
415 | "strictatime\0"
|
---|
416 | "loud\0"
|
---|
417 | "rbind\0"
|
---|
418 |
|
---|
419 | // action flags
|
---|
420 | "union\0"
|
---|
421 | "bind\0"
|
---|
422 | "move\0"
|
---|
423 | "make-shared\0"
|
---|
424 | "make-slave\0"
|
---|
425 | "make-private\0"
|
---|
426 | "make-unbindable\0"
|
---|
427 | "make-rshared\0"
|
---|
428 | "make-rslave\0"
|
---|
429 | "make-rprivate\0"
|
---|
430 | "make-runbindable\0"
|
---|
431 | )
|
---|
432 |
|
---|
433 | // Always understood.
|
---|
434 | "ro\0" // vfs flag
|
---|
435 | "rw\0" // vfs flag
|
---|
436 | "remount\0" // action flag
|
---|
437 | ;
|
---|
438 |
|
---|
439 |
|
---|
440 | struct globals {
|
---|
441 | #if ENABLE_FEATURE_MOUNT_NFS
|
---|
442 | smalluint nfs_mount_version;
|
---|
443 | #endif
|
---|
444 | #if ENABLE_FEATURE_MOUNT_VERBOSE
|
---|
445 | unsigned verbose;
|
---|
446 | #endif
|
---|
447 | llist_t *fslist;
|
---|
448 | char getmntent_buf[1];
|
---|
449 | } FIX_ALIASING;
|
---|
450 | enum { GETMNTENT_BUFSIZE = COMMON_BUFSIZE - offsetof(struct globals, getmntent_buf) };
|
---|
451 | #define G (*(struct globals*)bb_common_bufsiz1)
|
---|
452 | #define nfs_mount_version (G.nfs_mount_version)
|
---|
453 | #if ENABLE_FEATURE_MOUNT_VERBOSE
|
---|
454 | #define verbose (G.verbose )
|
---|
455 | #else
|
---|
456 | #define verbose 0
|
---|
457 | #endif
|
---|
458 | #define fslist (G.fslist )
|
---|
459 | #define getmntent_buf (G.getmntent_buf )
|
---|
460 | #define INIT_G() do { setup_common_bufsiz(); } while (0)
|
---|
461 |
|
---|
462 | #if ENABLE_FEATURE_MTAB_SUPPORT
|
---|
463 | /*
|
---|
464 | * update_mtab_entry_on_move() is used to update entry in case of mount --move.
|
---|
465 | * we are looking for existing entries mnt_dir which is equal to mnt_fsname of
|
---|
466 | * input mntent and replace it by new one.
|
---|
467 | */
|
---|
468 | static void FAST_FUNC update_mtab_entry_on_move(const struct mntent *mp)
|
---|
469 | {
|
---|
470 | struct mntent *entries, *m;
|
---|
471 | int i, count;
|
---|
472 | FILE *mountTable;
|
---|
473 |
|
---|
474 | mountTable = setmntent(bb_path_mtab_file, "r");
|
---|
475 | if (!mountTable) {
|
---|
476 | bb_perror_msg(bb_path_mtab_file);
|
---|
477 | return;
|
---|
478 | }
|
---|
479 |
|
---|
480 | entries = NULL;
|
---|
481 | count = 0;
|
---|
482 | while ((m = getmntent(mountTable)) != NULL) {
|
---|
483 | entries = xrealloc_vector(entries, 3, count);
|
---|
484 | entries[count].mnt_fsname = xstrdup(m->mnt_fsname);
|
---|
485 | entries[count].mnt_dir = xstrdup(m->mnt_dir);
|
---|
486 | entries[count].mnt_type = xstrdup(m->mnt_type);
|
---|
487 | entries[count].mnt_opts = xstrdup(m->mnt_opts);
|
---|
488 | entries[count].mnt_freq = m->mnt_freq;
|
---|
489 | entries[count].mnt_passno = m->mnt_passno;
|
---|
490 | count++;
|
---|
491 | }
|
---|
492 | endmntent(mountTable);
|
---|
493 |
|
---|
494 | mountTable = setmntent(bb_path_mtab_file, "w");
|
---|
495 | if (mountTable) {
|
---|
496 | for (i = 0; i < count; i++) {
|
---|
497 | if (strcmp(entries[i].mnt_dir, mp->mnt_fsname) != 0)
|
---|
498 | addmntent(mountTable, &entries[i]);
|
---|
499 | else
|
---|
500 | addmntent(mountTable, mp);
|
---|
501 | }
|
---|
502 | endmntent(mountTable);
|
---|
503 | } else if (errno != EROFS)
|
---|
504 | bb_perror_msg(bb_path_mtab_file);
|
---|
505 |
|
---|
506 | if (ENABLE_FEATURE_CLEAN_UP) {
|
---|
507 | for (i = 0; i < count; i++) {
|
---|
508 | free(entries[i].mnt_fsname);
|
---|
509 | free(entries[i].mnt_dir);
|
---|
510 | free(entries[i].mnt_type);
|
---|
511 | free(entries[i].mnt_opts);
|
---|
512 | }
|
---|
513 | free(entries);
|
---|
514 | }
|
---|
515 | }
|
---|
516 | #endif
|
---|
517 |
|
---|
518 | #if ENABLE_FEATURE_MOUNT_VERBOSE
|
---|
519 | static int verbose_mount(const char *source, const char *target,
|
---|
520 | const char *filesystemtype,
|
---|
521 | unsigned long mountflags, const void *data)
|
---|
522 | {
|
---|
523 | int rc;
|
---|
524 |
|
---|
525 | errno = 0;
|
---|
526 | rc = mount(source, target, filesystemtype, mountflags, data);
|
---|
527 | if (verbose >= 2)
|
---|
528 | bb_perror_msg("mount('%s','%s','%s',0x%08lx,'%s'):%d",
|
---|
529 | source, target, filesystemtype,
|
---|
530 | mountflags, (char*)data, rc);
|
---|
531 | return rc;
|
---|
532 | }
|
---|
533 | #else
|
---|
534 | #define verbose_mount(...) mount(__VA_ARGS__)
|
---|
535 | #endif
|
---|
536 |
|
---|
537 | // Append mount options to string
|
---|
538 | static void append_mount_options(char **oldopts, const char *newopts)
|
---|
539 | {
|
---|
540 | if (*oldopts && **oldopts) {
|
---|
541 | // Do not insert options which are already there
|
---|
542 | while (newopts[0]) {
|
---|
543 | char *p;
|
---|
544 | int len = strlen(newopts);
|
---|
545 | p = strchr(newopts, ',');
|
---|
546 | if (p) len = p - newopts;
|
---|
547 | p = *oldopts;
|
---|
548 | while (1) {
|
---|
549 | if (!strncmp(p, newopts, len)
|
---|
550 | && (p[len] == ',' || p[len] == '\0'))
|
---|
551 | goto skip;
|
---|
552 | p = strchr(p,',');
|
---|
553 | if (!p) break;
|
---|
554 | p++;
|
---|
555 | }
|
---|
556 | p = xasprintf("%s,%.*s", *oldopts, len, newopts);
|
---|
557 | free(*oldopts);
|
---|
558 | *oldopts = p;
|
---|
559 | skip:
|
---|
560 | newopts += len;
|
---|
561 | while (newopts[0] == ',') newopts++;
|
---|
562 | }
|
---|
563 | } else {
|
---|
564 | if (ENABLE_FEATURE_CLEAN_UP) free(*oldopts);
|
---|
565 | *oldopts = xstrdup(newopts);
|
---|
566 | }
|
---|
567 | }
|
---|
568 |
|
---|
569 | // Use the mount_options list to parse options into flags.
|
---|
570 | // Also update list of unrecognized options if unrecognized != NULL
|
---|
571 | static unsigned long parse_mount_options(char *options, char **unrecognized)
|
---|
572 | {
|
---|
573 | unsigned long flags = MS_SILENT;
|
---|
574 |
|
---|
575 | // Loop through options
|
---|
576 | for (;;) {
|
---|
577 | unsigned i;
|
---|
578 | char *comma = strchr(options, ',');
|
---|
579 | const char *option_str = mount_option_str;
|
---|
580 |
|
---|
581 | if (comma) *comma = '\0';
|
---|
582 |
|
---|
583 | // FIXME: use hasmntopt()
|
---|
584 | // Find this option in mount_options
|
---|
585 | for (i = 0; i < ARRAY_SIZE(mount_options); i++) {
|
---|
586 | unsigned opt_len = strlen(option_str);
|
---|
587 |
|
---|
588 | if (strncasecmp(option_str, options, opt_len) == 0
|
---|
589 | && (options[opt_len] == '\0'
|
---|
590 | /* or is it "comment=" thingy in fstab? */
|
---|
591 | IF_FEATURE_MOUNT_FSTAB(IF_DESKTOP( || option_str[opt_len-1] == '=' ))
|
---|
592 | )
|
---|
593 | ) {
|
---|
594 | unsigned long fl = mount_options[i];
|
---|
595 | if (fl & BB_MS_INVERTED_VALUE)
|
---|
596 | flags &= fl;
|
---|
597 | else
|
---|
598 | flags |= fl;
|
---|
599 | goto found;
|
---|
600 | }
|
---|
601 | option_str += opt_len + 1;
|
---|
602 | }
|
---|
603 | // We did not recognize this option.
|
---|
604 | // If "unrecognized" is not NULL, append option there.
|
---|
605 | // Note that we should not append *empty* option -
|
---|
606 | // in this case we want to pass NULL, not "", to "data"
|
---|
607 | // parameter of mount(2) syscall.
|
---|
608 | // This is crucial for filesystems that don't accept
|
---|
609 | // any arbitrary mount options, like cgroup fs:
|
---|
610 | // "mount -t cgroup none /mnt"
|
---|
611 | if (options[0] && unrecognized) {
|
---|
612 | // Add it to strflags, to pass on to kernel
|
---|
613 | char *p = *unrecognized;
|
---|
614 | unsigned len = p ? strlen(p) : 0;
|
---|
615 | *unrecognized = p = xrealloc(p, len + strlen(options) + 2);
|
---|
616 |
|
---|
617 | // Comma separated if it's not the first one
|
---|
618 | if (len) p[len++] = ',';
|
---|
619 | strcpy(p + len, options);
|
---|
620 | }
|
---|
621 | found:
|
---|
622 | if (!comma)
|
---|
623 | break;
|
---|
624 | // Advance to next option
|
---|
625 | *comma = ',';
|
---|
626 | options = ++comma;
|
---|
627 | }
|
---|
628 |
|
---|
629 | return flags;
|
---|
630 | }
|
---|
631 |
|
---|
632 | // Return a list of all block device backed filesystems
|
---|
633 | static llist_t *get_block_backed_filesystems(void)
|
---|
634 | {
|
---|
635 | static const char filesystems[2][sizeof("/proc/filesystems")] = {
|
---|
636 | "/etc/filesystems",
|
---|
637 | "/proc/filesystems",
|
---|
638 | };
|
---|
639 | char *fs, *buf;
|
---|
640 | llist_t *list = NULL;
|
---|
641 | int i;
|
---|
642 | FILE *f;
|
---|
643 |
|
---|
644 | for (i = 0; i < 2; i++) {
|
---|
645 | f = fopen_for_read(filesystems[i]);
|
---|
646 | if (!f) continue;
|
---|
647 |
|
---|
648 | while ((buf = xmalloc_fgetline(f)) != NULL) {
|
---|
649 | if (is_prefixed_with(buf, "nodev") && isspace(buf[5]))
|
---|
650 | goto next;
|
---|
651 | fs = skip_whitespace(buf);
|
---|
652 | if (*fs == '#' || *fs == '*' || !*fs)
|
---|
653 | goto next;
|
---|
654 |
|
---|
655 | llist_add_to_end(&list, xstrdup(fs));
|
---|
656 | next:
|
---|
657 | free(buf);
|
---|
658 | }
|
---|
659 | if (ENABLE_FEATURE_CLEAN_UP) fclose(f);
|
---|
660 | }
|
---|
661 |
|
---|
662 | return list;
|
---|
663 | }
|
---|
664 |
|
---|
665 | #if ENABLE_FEATURE_CLEAN_UP
|
---|
666 | static void delete_block_backed_filesystems(void)
|
---|
667 | {
|
---|
668 | llist_free(fslist, free);
|
---|
669 | }
|
---|
670 | #else
|
---|
671 | void delete_block_backed_filesystems(void);
|
---|
672 | #endif
|
---|
673 |
|
---|
674 | // Perform actual mount of specific filesystem at specific location.
|
---|
675 | // NB: mp->xxx fields may be trashed on exit
|
---|
676 | static int mount_it_now(struct mntent *mp, unsigned long vfsflags, char *filteropts)
|
---|
677 | {
|
---|
678 | int rc = 0;
|
---|
679 |
|
---|
680 | vfsflags &= ~(unsigned long)MOUNT_FAKEFLAGS;
|
---|
681 |
|
---|
682 | if (FAKE_IT) {
|
---|
683 | if (verbose >= 2)
|
---|
684 | bb_error_msg("would do mount('%s','%s','%s',0x%08lx,'%s')",
|
---|
685 | mp->mnt_fsname, mp->mnt_dir, mp->mnt_type,
|
---|
686 | vfsflags, filteropts);
|
---|
687 | goto mtab;
|
---|
688 | }
|
---|
689 |
|
---|
690 | // Mount, with fallback to read-only if necessary.
|
---|
691 | for (;;) {
|
---|
692 | errno = 0;
|
---|
693 | rc = verbose_mount(mp->mnt_fsname, mp->mnt_dir, mp->mnt_type,
|
---|
694 | vfsflags, filteropts);
|
---|
695 |
|
---|
696 | // If mount failed, try
|
---|
697 | // helper program mount.<mnt_type>
|
---|
698 | if (HELPERS_ALLOWED && rc && mp->mnt_type) {
|
---|
699 | char *args[8];
|
---|
700 | int errno_save = errno;
|
---|
701 | args[0] = xasprintf("mount.%s", mp->mnt_type);
|
---|
702 | rc = 1;
|
---|
703 | if (FAKE_IT)
|
---|
704 | args[rc++] = (char *)"-f";
|
---|
705 | if (ENABLE_FEATURE_MTAB_SUPPORT && !USE_MTAB)
|
---|
706 | args[rc++] = (char *)"-n";
|
---|
707 | args[rc++] = mp->mnt_fsname;
|
---|
708 | args[rc++] = mp->mnt_dir;
|
---|
709 | if (filteropts) {
|
---|
710 | args[rc++] = (char *)"-o";
|
---|
711 | args[rc++] = filteropts;
|
---|
712 | }
|
---|
713 | args[rc] = NULL;
|
---|
714 | rc = spawn_and_wait(args);
|
---|
715 | free(args[0]);
|
---|
716 | if (!rc)
|
---|
717 | break;
|
---|
718 | errno = errno_save;
|
---|
719 | }
|
---|
720 |
|
---|
721 | if (!rc || (vfsflags & MS_RDONLY) || (errno != EACCES && errno != EROFS))
|
---|
722 | break;
|
---|
723 | if (!(vfsflags & MS_SILENT))
|
---|
724 | bb_error_msg("%s is write-protected, mounting read-only",
|
---|
725 | mp->mnt_fsname);
|
---|
726 | vfsflags |= MS_RDONLY;
|
---|
727 | }
|
---|
728 |
|
---|
729 | // Abort entirely if permission denied.
|
---|
730 |
|
---|
731 | if (rc && errno == EPERM)
|
---|
732 | bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
|
---|
733 |
|
---|
734 | // If the mount was successful, and we're maintaining an old-style
|
---|
735 | // mtab file by hand, add the new entry to it now.
|
---|
736 | mtab:
|
---|
737 | if (USE_MTAB && !rc && !(vfsflags & MS_REMOUNT)) {
|
---|
738 | char *fsname;
|
---|
739 | FILE *mountTable = setmntent(bb_path_mtab_file, "a+");
|
---|
740 | const char *option_str = mount_option_str;
|
---|
741 | int i;
|
---|
742 |
|
---|
743 | if (!mountTable) {
|
---|
744 | bb_perror_msg(bb_path_mtab_file);
|
---|
745 | goto ret;
|
---|
746 | }
|
---|
747 |
|
---|
748 | // Add vfs string flags
|
---|
749 | for (i = 0; mount_options[i] != MS_REMOUNT; i++) {
|
---|
750 | if (mount_options[i] > 0 && (mount_options[i] & vfsflags))
|
---|
751 | append_mount_options(&(mp->mnt_opts), option_str);
|
---|
752 | option_str += strlen(option_str) + 1;
|
---|
753 | }
|
---|
754 |
|
---|
755 | // Remove trailing / (if any) from directory we mounted on
|
---|
756 | i = strlen(mp->mnt_dir) - 1;
|
---|
757 | while (i > 0 && mp->mnt_dir[i] == '/')
|
---|
758 | mp->mnt_dir[i--] = '\0';
|
---|
759 |
|
---|
760 | // Convert to canonical pathnames as needed
|
---|
761 | mp->mnt_dir = bb_simplify_path(mp->mnt_dir);
|
---|
762 | fsname = NULL;
|
---|
763 | if (!mp->mnt_type || !*mp->mnt_type) { // bind mount
|
---|
764 | mp->mnt_fsname = fsname = bb_simplify_path(mp->mnt_fsname);
|
---|
765 | mp->mnt_type = (char*)"bind";
|
---|
766 | }
|
---|
767 | mp->mnt_freq = mp->mnt_passno = 0;
|
---|
768 |
|
---|
769 | // Write and close
|
---|
770 | #if ENABLE_FEATURE_MTAB_SUPPORT
|
---|
771 | if (vfsflags & MS_MOVE)
|
---|
772 | update_mtab_entry_on_move(mp);
|
---|
773 | else
|
---|
774 | #endif
|
---|
775 | addmntent(mountTable, mp);
|
---|
776 | endmntent(mountTable);
|
---|
777 |
|
---|
778 | if (ENABLE_FEATURE_CLEAN_UP) {
|
---|
779 | free(mp->mnt_dir);
|
---|
780 | free(fsname);
|
---|
781 | }
|
---|
782 | }
|
---|
783 | ret:
|
---|
784 | return rc;
|
---|
785 | }
|
---|
786 |
|
---|
787 | #if ENABLE_FEATURE_MOUNT_NFS
|
---|
788 |
|
---|
789 | /*
|
---|
790 | * Linux NFS mount
|
---|
791 | * Copyright (C) 1993 Rick Sladkey <jrs@world.std.com>
|
---|
792 | *
|
---|
793 | * Licensed under GPLv2, see file LICENSE in this source tree.
|
---|
794 | *
|
---|
795 | * Wed Feb 8 12:51:48 1995, biro@yggdrasil.com (Ross Biro): allow all port
|
---|
796 | * numbers to be specified on the command line.
|
---|
797 | *
|
---|
798 | * Fri, 8 Mar 1996 18:01:39, Swen Thuemmler <swen@uni-paderborn.de>:
|
---|
799 | * Omit the call to connect() for Linux version 1.3.11 or later.
|
---|
800 | *
|
---|
801 | * Wed Oct 1 23:55:28 1997: Dick Streefland <dick_streefland@tasking.com>
|
---|
802 | * Implemented the "bg", "fg" and "retry" mount options for NFS.
|
---|
803 | *
|
---|
804 | * 1999-02-22 Arkadiusz Mickiewicz <misiek@misiek.eu.org>
|
---|
805 | * - added Native Language Support
|
---|
806 | *
|
---|
807 | * Modified by Olaf Kirch and Trond Myklebust for new NFS code,
|
---|
808 | * plus NFSv3 stuff.
|
---|
809 | */
|
---|
810 |
|
---|
811 | #define MOUNTPORT 635
|
---|
812 | #define MNTPATHLEN 1024
|
---|
813 | #define MNTNAMLEN 255
|
---|
814 | #define FHSIZE 32
|
---|
815 | #define FHSIZE3 64
|
---|
816 |
|
---|
817 | typedef char fhandle[FHSIZE];
|
---|
818 |
|
---|
819 | typedef struct {
|
---|
820 | unsigned int fhandle3_len;
|
---|
821 | char *fhandle3_val;
|
---|
822 | } fhandle3;
|
---|
823 |
|
---|
824 | enum mountstat3 {
|
---|
825 | MNT_OK = 0,
|
---|
826 | MNT3ERR_PERM = 1,
|
---|
827 | MNT3ERR_NOENT = 2,
|
---|
828 | MNT3ERR_IO = 5,
|
---|
829 | MNT3ERR_ACCES = 13,
|
---|
830 | MNT3ERR_NOTDIR = 20,
|
---|
831 | MNT3ERR_INVAL = 22,
|
---|
832 | MNT3ERR_NAMETOOLONG = 63,
|
---|
833 | MNT3ERR_NOTSUPP = 10004,
|
---|
834 | MNT3ERR_SERVERFAULT = 10006,
|
---|
835 | };
|
---|
836 | typedef enum mountstat3 mountstat3;
|
---|
837 |
|
---|
838 | struct fhstatus {
|
---|
839 | unsigned int fhs_status;
|
---|
840 | union {
|
---|
841 | fhandle fhs_fhandle;
|
---|
842 | } fhstatus_u;
|
---|
843 | };
|
---|
844 | typedef struct fhstatus fhstatus;
|
---|
845 |
|
---|
846 | struct mountres3_ok {
|
---|
847 | fhandle3 fhandle;
|
---|
848 | struct {
|
---|
849 | unsigned int auth_flavours_len;
|
---|
850 | char *auth_flavours_val;
|
---|
851 | } auth_flavours;
|
---|
852 | };
|
---|
853 | typedef struct mountres3_ok mountres3_ok;
|
---|
854 |
|
---|
855 | struct mountres3 {
|
---|
856 | mountstat3 fhs_status;
|
---|
857 | union {
|
---|
858 | mountres3_ok mountinfo;
|
---|
859 | } mountres3_u;
|
---|
860 | };
|
---|
861 | typedef struct mountres3 mountres3;
|
---|
862 |
|
---|
863 | typedef char *dirpath;
|
---|
864 |
|
---|
865 | typedef char *name;
|
---|
866 |
|
---|
867 | typedef struct mountbody *mountlist;
|
---|
868 |
|
---|
869 | struct mountbody {
|
---|
870 | name ml_hostname;
|
---|
871 | dirpath ml_directory;
|
---|
872 | mountlist ml_next;
|
---|
873 | };
|
---|
874 | typedef struct mountbody mountbody;
|
---|
875 |
|
---|
876 | typedef struct groupnode *groups;
|
---|
877 |
|
---|
878 | struct groupnode {
|
---|
879 | name gr_name;
|
---|
880 | groups gr_next;
|
---|
881 | };
|
---|
882 | typedef struct groupnode groupnode;
|
---|
883 |
|
---|
884 | typedef struct exportnode *exports;
|
---|
885 |
|
---|
886 | struct exportnode {
|
---|
887 | dirpath ex_dir;
|
---|
888 | groups ex_groups;
|
---|
889 | exports ex_next;
|
---|
890 | };
|
---|
891 | typedef struct exportnode exportnode;
|
---|
892 |
|
---|
893 | struct ppathcnf {
|
---|
894 | int pc_link_max;
|
---|
895 | short pc_max_canon;
|
---|
896 | short pc_max_input;
|
---|
897 | short pc_name_max;
|
---|
898 | short pc_path_max;
|
---|
899 | short pc_pipe_buf;
|
---|
900 | uint8_t pc_vdisable;
|
---|
901 | char pc_xxx;
|
---|
902 | short pc_mask[2];
|
---|
903 | };
|
---|
904 | typedef struct ppathcnf ppathcnf;
|
---|
905 |
|
---|
906 | #define MOUNTPROG 100005
|
---|
907 | #define MOUNTVERS 1
|
---|
908 |
|
---|
909 | #define MOUNTPROC_NULL 0
|
---|
910 | #define MOUNTPROC_MNT 1
|
---|
911 | #define MOUNTPROC_DUMP 2
|
---|
912 | #define MOUNTPROC_UMNT 3
|
---|
913 | #define MOUNTPROC_UMNTALL 4
|
---|
914 | #define MOUNTPROC_EXPORT 5
|
---|
915 | #define MOUNTPROC_EXPORTALL 6
|
---|
916 |
|
---|
917 | #define MOUNTVERS_POSIX 2
|
---|
918 |
|
---|
919 | #define MOUNTPROC_PATHCONF 7
|
---|
920 |
|
---|
921 | #define MOUNT_V3 3
|
---|
922 |
|
---|
923 | #define MOUNTPROC3_NULL 0
|
---|
924 | #define MOUNTPROC3_MNT 1
|
---|
925 | #define MOUNTPROC3_DUMP 2
|
---|
926 | #define MOUNTPROC3_UMNT 3
|
---|
927 | #define MOUNTPROC3_UMNTALL 4
|
---|
928 | #define MOUNTPROC3_EXPORT 5
|
---|
929 |
|
---|
930 | enum {
|
---|
931 | #ifndef NFS_FHSIZE
|
---|
932 | NFS_FHSIZE = 32,
|
---|
933 | #endif
|
---|
934 | #ifndef NFS_PORT
|
---|
935 | NFS_PORT = 2049
|
---|
936 | #endif
|
---|
937 | };
|
---|
938 |
|
---|
939 | /*
|
---|
940 | * We want to be able to compile mount on old kernels in such a way
|
---|
941 | * that the binary will work well on more recent kernels.
|
---|
942 | * Thus, if necessary we teach nfsmount.c the structure of new fields
|
---|
943 | * that will come later.
|
---|
944 | *
|
---|
945 | * Moreover, the new kernel includes conflict with glibc includes
|
---|
946 | * so it is easiest to ignore the kernel altogether (at compile time).
|
---|
947 | */
|
---|
948 |
|
---|
949 | struct nfs2_fh {
|
---|
950 | char data[32];
|
---|
951 | };
|
---|
952 | struct nfs3_fh {
|
---|
953 | unsigned short size;
|
---|
954 | unsigned char data[64];
|
---|
955 | };
|
---|
956 |
|
---|
957 | struct nfs_mount_data {
|
---|
958 | int version; /* 1 */
|
---|
959 | int fd; /* 1 */
|
---|
960 | struct nfs2_fh old_root; /* 1 */
|
---|
961 | int flags; /* 1 */
|
---|
962 | int rsize; /* 1 */
|
---|
963 | int wsize; /* 1 */
|
---|
964 | int timeo; /* 1 */
|
---|
965 | int retrans; /* 1 */
|
---|
966 | int acregmin; /* 1 */
|
---|
967 | int acregmax; /* 1 */
|
---|
968 | int acdirmin; /* 1 */
|
---|
969 | int acdirmax; /* 1 */
|
---|
970 | struct sockaddr_in addr; /* 1 */
|
---|
971 | char hostname[256]; /* 1 */
|
---|
972 | int namlen; /* 2 */
|
---|
973 | unsigned int bsize; /* 3 */
|
---|
974 | struct nfs3_fh root; /* 4 */
|
---|
975 | };
|
---|
976 |
|
---|
977 | /* bits in the flags field */
|
---|
978 | enum {
|
---|
979 | NFS_MOUNT_SOFT = 0x0001, /* 1 */
|
---|
980 | NFS_MOUNT_INTR = 0x0002, /* 1 */
|
---|
981 | NFS_MOUNT_SECURE = 0x0004, /* 1 */
|
---|
982 | NFS_MOUNT_POSIX = 0x0008, /* 1 */
|
---|
983 | NFS_MOUNT_NOCTO = 0x0010, /* 1 */
|
---|
984 | NFS_MOUNT_NOAC = 0x0020, /* 1 */
|
---|
985 | NFS_MOUNT_TCP = 0x0040, /* 2 */
|
---|
986 | NFS_MOUNT_VER3 = 0x0080, /* 3 */
|
---|
987 | NFS_MOUNT_KERBEROS = 0x0100, /* 3 */
|
---|
988 | NFS_MOUNT_NONLM = 0x0200, /* 3 */
|
---|
989 | NFS_MOUNT_NOACL = 0x0800, /* 4 */
|
---|
990 | NFS_MOUNT_NORDIRPLUS = 0x4000
|
---|
991 | };
|
---|
992 |
|
---|
993 |
|
---|
994 | /*
|
---|
995 | * We need to translate between nfs status return values and
|
---|
996 | * the local errno values which may not be the same.
|
---|
997 | *
|
---|
998 | * Andreas Schwab <schwab@LS5.informatik.uni-dortmund.de>: change errno:
|
---|
999 | * "after #include <errno.h> the symbol errno is reserved for any use,
|
---|
1000 | * it cannot even be used as a struct tag or field name".
|
---|
1001 | */
|
---|
1002 | #ifndef EDQUOT
|
---|
1003 | # define EDQUOT ENOSPC
|
---|
1004 | #endif
|
---|
1005 | /* Convert each NFSERR_BLAH into EBLAH */
|
---|
1006 | static const uint8_t nfs_err_stat[] ALIGN1 = {
|
---|
1007 | 1, 2, 5, 6, 13, 17,
|
---|
1008 | 19, 20, 21, 22, 27, 28,
|
---|
1009 | 30, 63, 66, 69, 70, 71
|
---|
1010 | };
|
---|
1011 | #if ( \
|
---|
1012 | EPERM | ENOENT | EIO | ENXIO | EACCES| EEXIST | \
|
---|
1013 | ENODEV| ENOTDIR | EISDIR | EINVAL| EFBIG | ENOSPC | \
|
---|
1014 | EROFS | ENAMETOOLONG| ENOTEMPTY| EDQUOT| ESTALE| EREMOTE) < 256
|
---|
1015 | typedef uint8_t nfs_err_type;
|
---|
1016 | #else
|
---|
1017 | typedef uint16_t nfs_err_type;
|
---|
1018 | #endif
|
---|
1019 | static const nfs_err_type nfs_err_errnum[] ALIGN2 = {
|
---|
1020 | EPERM , ENOENT , EIO , ENXIO , EACCES, EEXIST,
|
---|
1021 | ENODEV, ENOTDIR , EISDIR , EINVAL, EFBIG , ENOSPC,
|
---|
1022 | EROFS , ENAMETOOLONG, ENOTEMPTY, EDQUOT, ESTALE, EREMOTE
|
---|
1023 | };
|
---|
1024 | static char *nfs_strerror(int status)
|
---|
1025 | {
|
---|
1026 | int i;
|
---|
1027 |
|
---|
1028 | for (i = 0; i < ARRAY_SIZE(nfs_err_stat); i++) {
|
---|
1029 | if (nfs_err_stat[i] == status)
|
---|
1030 | return strerror(nfs_err_errnum[i]);
|
---|
1031 | }
|
---|
1032 | return xasprintf("unknown nfs status return value: %d", status);
|
---|
1033 | }
|
---|
1034 |
|
---|
1035 | static bool_t xdr_fhandle(XDR *xdrs, fhandle objp)
|
---|
1036 | {
|
---|
1037 | return xdr_opaque(xdrs, objp, FHSIZE);
|
---|
1038 | }
|
---|
1039 |
|
---|
1040 | static bool_t xdr_fhstatus(XDR *xdrs, fhstatus *objp)
|
---|
1041 | {
|
---|
1042 | if (!xdr_u_int(xdrs, &objp->fhs_status))
|
---|
1043 | return FALSE;
|
---|
1044 | if (objp->fhs_status == 0)
|
---|
1045 | return xdr_fhandle(xdrs, objp->fhstatus_u.fhs_fhandle);
|
---|
1046 | return TRUE;
|
---|
1047 | }
|
---|
1048 |
|
---|
1049 | static bool_t xdr_dirpath(XDR *xdrs, dirpath *objp)
|
---|
1050 | {
|
---|
1051 | return xdr_string(xdrs, objp, MNTPATHLEN);
|
---|
1052 | }
|
---|
1053 |
|
---|
1054 | static bool_t xdr_fhandle3(XDR *xdrs, fhandle3 *objp)
|
---|
1055 | {
|
---|
1056 | return xdr_bytes(xdrs, (char **)&objp->fhandle3_val,
|
---|
1057 | (unsigned int *) &objp->fhandle3_len,
|
---|
1058 | FHSIZE3);
|
---|
1059 | }
|
---|
1060 |
|
---|
1061 | static bool_t xdr_mountres3_ok(XDR *xdrs, mountres3_ok *objp)
|
---|
1062 | {
|
---|
1063 | if (!xdr_fhandle3(xdrs, &objp->fhandle))
|
---|
1064 | return FALSE;
|
---|
1065 | return xdr_array(xdrs, &(objp->auth_flavours.auth_flavours_val),
|
---|
1066 | &(objp->auth_flavours.auth_flavours_len),
|
---|
1067 | ~0,
|
---|
1068 | sizeof(int),
|
---|
1069 | (xdrproc_t) xdr_int);
|
---|
1070 | }
|
---|
1071 |
|
---|
1072 | static bool_t xdr_mountstat3(XDR *xdrs, mountstat3 *objp)
|
---|
1073 | {
|
---|
1074 | return xdr_enum(xdrs, (enum_t *) objp);
|
---|
1075 | }
|
---|
1076 |
|
---|
1077 | static bool_t xdr_mountres3(XDR *xdrs, mountres3 *objp)
|
---|
1078 | {
|
---|
1079 | if (!xdr_mountstat3(xdrs, &objp->fhs_status))
|
---|
1080 | return FALSE;
|
---|
1081 | if (objp->fhs_status == MNT_OK)
|
---|
1082 | return xdr_mountres3_ok(xdrs, &objp->mountres3_u.mountinfo);
|
---|
1083 | return TRUE;
|
---|
1084 | }
|
---|
1085 |
|
---|
1086 | #define MAX_NFSPROT ((nfs_mount_version >= 4) ? 3 : 2)
|
---|
1087 |
|
---|
1088 | /*
|
---|
1089 | * Unfortunately, the kernel prints annoying console messages
|
---|
1090 | * in case of an unexpected nfs mount version (instead of
|
---|
1091 | * just returning some error). Therefore we'll have to try
|
---|
1092 | * and figure out what version the kernel expects.
|
---|
1093 | *
|
---|
1094 | * Variables:
|
---|
1095 | * KERNEL_NFS_MOUNT_VERSION: kernel sources at compile time
|
---|
1096 | * NFS_MOUNT_VERSION: these nfsmount sources at compile time
|
---|
1097 | * nfs_mount_version: version this source and running kernel can handle
|
---|
1098 | */
|
---|
1099 | static void
|
---|
1100 | find_kernel_nfs_mount_version(void)
|
---|
1101 | {
|
---|
1102 | int kernel_version;
|
---|
1103 |
|
---|
1104 | if (nfs_mount_version)
|
---|
1105 | return;
|
---|
1106 |
|
---|
1107 | nfs_mount_version = 4; /* default */
|
---|
1108 |
|
---|
1109 | kernel_version = get_linux_version_code();
|
---|
1110 | if (kernel_version) {
|
---|
1111 | if (kernel_version < KERNEL_VERSION(2,2,18))
|
---|
1112 | nfs_mount_version = 3;
|
---|
1113 | /* else v4 since 2.3.99pre4 */
|
---|
1114 | }
|
---|
1115 | }
|
---|
1116 |
|
---|
1117 | static void
|
---|
1118 | get_mountport(struct pmap *pm_mnt,
|
---|
1119 | struct sockaddr_in *server_addr,
|
---|
1120 | long unsigned prog,
|
---|
1121 | long unsigned version,
|
---|
1122 | long unsigned proto,
|
---|
1123 | long unsigned port)
|
---|
1124 | {
|
---|
1125 | struct pmaplist *pmap;
|
---|
1126 |
|
---|
1127 | server_addr->sin_port = PMAPPORT;
|
---|
1128 | /* glibc 2.4 (still) has pmap_getmaps(struct sockaddr_in *).
|
---|
1129 | * I understand it like "IPv6 for this is not 100% ready" */
|
---|
1130 | pmap = pmap_getmaps(server_addr);
|
---|
1131 |
|
---|
1132 | if (version > MAX_NFSPROT)
|
---|
1133 | version = MAX_NFSPROT;
|
---|
1134 | if (!prog)
|
---|
1135 | prog = MOUNTPROG;
|
---|
1136 | pm_mnt->pm_prog = prog;
|
---|
1137 | pm_mnt->pm_vers = version;
|
---|
1138 | pm_mnt->pm_prot = proto;
|
---|
1139 | pm_mnt->pm_port = port;
|
---|
1140 |
|
---|
1141 | while (pmap) {
|
---|
1142 | if (pmap->pml_map.pm_prog != prog)
|
---|
1143 | goto next;
|
---|
1144 | if (!version && pm_mnt->pm_vers > pmap->pml_map.pm_vers)
|
---|
1145 | goto next;
|
---|
1146 | if (version > 2 && pmap->pml_map.pm_vers != version)
|
---|
1147 | goto next;
|
---|
1148 | if (version && version <= 2 && pmap->pml_map.pm_vers > 2)
|
---|
1149 | goto next;
|
---|
1150 | if (pmap->pml_map.pm_vers > MAX_NFSPROT
|
---|
1151 | || (proto && pm_mnt->pm_prot && pmap->pml_map.pm_prot != proto)
|
---|
1152 | || (port && pmap->pml_map.pm_port != port)
|
---|
1153 | ) {
|
---|
1154 | goto next;
|
---|
1155 | }
|
---|
1156 | memcpy(pm_mnt, &pmap->pml_map, sizeof(*pm_mnt));
|
---|
1157 | next:
|
---|
1158 | pmap = pmap->pml_next;
|
---|
1159 | }
|
---|
1160 | if (!pm_mnt->pm_vers)
|
---|
1161 | pm_mnt->pm_vers = MOUNTVERS;
|
---|
1162 | if (!pm_mnt->pm_port)
|
---|
1163 | pm_mnt->pm_port = MOUNTPORT;
|
---|
1164 | if (!pm_mnt->pm_prot)
|
---|
1165 | pm_mnt->pm_prot = IPPROTO_TCP;
|
---|
1166 | }
|
---|
1167 |
|
---|
1168 | #if BB_MMU
|
---|
1169 | static int daemonize(void)
|
---|
1170 | {
|
---|
1171 | int pid = fork();
|
---|
1172 | if (pid < 0) /* error */
|
---|
1173 | return -errno;
|
---|
1174 | if (pid > 0) /* parent */
|
---|
1175 | return 0;
|
---|
1176 | /* child */
|
---|
1177 | close(0);
|
---|
1178 | xopen(bb_dev_null, O_RDWR);
|
---|
1179 | xdup2(0, 1);
|
---|
1180 | xdup2(0, 2);
|
---|
1181 | setsid();
|
---|
1182 | openlog(applet_name, LOG_PID, LOG_DAEMON);
|
---|
1183 | logmode = LOGMODE_SYSLOG;
|
---|
1184 | return 1;
|
---|
1185 | }
|
---|
1186 | #else
|
---|
1187 | static inline int daemonize(void) { return -ENOSYS; }
|
---|
1188 | #endif
|
---|
1189 |
|
---|
1190 | /* TODO */
|
---|
1191 | static inline int we_saw_this_host_before(const char *hostname UNUSED_PARAM)
|
---|
1192 | {
|
---|
1193 | return 0;
|
---|
1194 | }
|
---|
1195 |
|
---|
1196 | /* RPC strerror analogs are terminally idiotic:
|
---|
1197 | * *mandatory* prefix and \n at end.
|
---|
1198 | * This hopefully helps. Usage:
|
---|
1199 | * error_msg_rpc(clnt_*error*(" ")) */
|
---|
1200 | static void error_msg_rpc(const char *msg)
|
---|
1201 | {
|
---|
1202 | int len;
|
---|
1203 | while (msg[0] == ' ' || msg[0] == ':') msg++;
|
---|
1204 | len = strlen(msg);
|
---|
1205 | while (len && msg[len-1] == '\n') len--;
|
---|
1206 | bb_error_msg("%.*s", len, msg);
|
---|
1207 | }
|
---|
1208 |
|
---|
1209 | /* NB: mp->xxx fields may be trashed on exit */
|
---|
1210 | static NOINLINE int nfsmount(struct mntent *mp, unsigned long vfsflags, char *filteropts)
|
---|
1211 | {
|
---|
1212 | CLIENT *mclient;
|
---|
1213 | char *hostname;
|
---|
1214 | char *pathname;
|
---|
1215 | char *mounthost;
|
---|
1216 | /* prior to 2.6.23, kernel took NFS options in a form of this struct
|
---|
1217 | * only. 2.6.23+ looks at data->version, and if it's not 1..6,
|
---|
1218 | * then data pointer is interpreted as a string. */
|
---|
1219 | struct nfs_mount_data data;
|
---|
1220 | char *opt;
|
---|
1221 | struct hostent *hp;
|
---|
1222 | struct sockaddr_in server_addr;
|
---|
1223 | struct sockaddr_in mount_server_addr;
|
---|
1224 | int msock, fsock;
|
---|
1225 | union {
|
---|
1226 | struct fhstatus nfsv2;
|
---|
1227 | struct mountres3 nfsv3;
|
---|
1228 | } status;
|
---|
1229 | int daemonized;
|
---|
1230 | char *s;
|
---|
1231 | int port;
|
---|
1232 | int mountport;
|
---|
1233 | int proto;
|
---|
1234 | #if BB_MMU
|
---|
1235 | smallint bg = 0;
|
---|
1236 | #else
|
---|
1237 | enum { bg = 0 };
|
---|
1238 | #endif
|
---|
1239 | int retry;
|
---|
1240 | int mountprog;
|
---|
1241 | int mountvers;
|
---|
1242 | int nfsprog;
|
---|
1243 | int nfsvers;
|
---|
1244 | int retval;
|
---|
1245 | /* these all are one-bit really. gcc 4.3.1 likes this combination: */
|
---|
1246 | smallint tcp;
|
---|
1247 | smallint soft;
|
---|
1248 | int intr;
|
---|
1249 | int posix;
|
---|
1250 | int nocto;
|
---|
1251 | int noac;
|
---|
1252 | int nordirplus;
|
---|
1253 | int nolock;
|
---|
1254 | int noacl;
|
---|
1255 |
|
---|
1256 | find_kernel_nfs_mount_version();
|
---|
1257 |
|
---|
1258 | daemonized = 0;
|
---|
1259 | mounthost = NULL;
|
---|
1260 | retval = ETIMEDOUT;
|
---|
1261 | msock = fsock = -1;
|
---|
1262 | mclient = NULL;
|
---|
1263 |
|
---|
1264 | /* NB: hostname, mounthost, filteropts must be free()d prior to return */
|
---|
1265 |
|
---|
1266 | filteropts = xstrdup(filteropts); /* going to trash it later... */
|
---|
1267 |
|
---|
1268 | hostname = xstrdup(mp->mnt_fsname);
|
---|
1269 | /* mount_main() guarantees that ':' is there */
|
---|
1270 | s = strchr(hostname, ':');
|
---|
1271 | pathname = s + 1;
|
---|
1272 | *s = '\0';
|
---|
1273 | /* Ignore all but first hostname in replicated mounts
|
---|
1274 | * until they can be fully supported. (mack@sgi.com) */
|
---|
1275 | s = strchr(hostname, ',');
|
---|
1276 | if (s) {
|
---|
1277 | *s = '\0';
|
---|
1278 | bb_error_msg("warning: multiple hostnames not supported");
|
---|
1279 | }
|
---|
1280 |
|
---|
1281 | server_addr.sin_family = AF_INET;
|
---|
1282 | if (!inet_aton(hostname, &server_addr.sin_addr)) {
|
---|
1283 | hp = gethostbyname(hostname);
|
---|
1284 | if (hp == NULL) {
|
---|
1285 | bb_herror_msg("%s", hostname);
|
---|
1286 | goto fail;
|
---|
1287 | }
|
---|
1288 | if (hp->h_length != (int)sizeof(struct in_addr)) {
|
---|
1289 | bb_error_msg_and_die("only IPv4 is supported");
|
---|
1290 | }
|
---|
1291 | memcpy(&server_addr.sin_addr, hp->h_addr_list[0], sizeof(struct in_addr));
|
---|
1292 | }
|
---|
1293 |
|
---|
1294 | memcpy(&mount_server_addr, &server_addr, sizeof(mount_server_addr));
|
---|
1295 |
|
---|
1296 | /* add IP address to mtab options for use when unmounting */
|
---|
1297 |
|
---|
1298 | if (!mp->mnt_opts) { /* TODO: actually mp->mnt_opts is never NULL */
|
---|
1299 | mp->mnt_opts = xasprintf("addr=%s", inet_ntoa(server_addr.sin_addr));
|
---|
1300 | } else {
|
---|
1301 | char *tmp = xasprintf("%s%saddr=%s", mp->mnt_opts,
|
---|
1302 | mp->mnt_opts[0] ? "," : "",
|
---|
1303 | inet_ntoa(server_addr.sin_addr));
|
---|
1304 | free(mp->mnt_opts);
|
---|
1305 | mp->mnt_opts = tmp;
|
---|
1306 | }
|
---|
1307 |
|
---|
1308 | /* Set default options.
|
---|
1309 | * rsize/wsize (and bsize, for ver >= 3) are left 0 in order to
|
---|
1310 | * let the kernel decide.
|
---|
1311 | * timeo is filled in after we know whether it'll be TCP or UDP. */
|
---|
1312 | memset(&data, 0, sizeof(data));
|
---|
1313 | data.retrans = 3;
|
---|
1314 | data.acregmin = 3;
|
---|
1315 | data.acregmax = 60;
|
---|
1316 | data.acdirmin = 30;
|
---|
1317 | data.acdirmax = 60;
|
---|
1318 | data.namlen = NAME_MAX;
|
---|
1319 |
|
---|
1320 | soft = 0;
|
---|
1321 | intr = 0;
|
---|
1322 | posix = 0;
|
---|
1323 | nocto = 0;
|
---|
1324 | nolock = 0;
|
---|
1325 | noac = 0;
|
---|
1326 | nordirplus = 0;
|
---|
1327 | noacl = 0;
|
---|
1328 | retry = 10000; /* 10000 minutes ~ 1 week */
|
---|
1329 | tcp = 1; /* nfs-utils uses tcp per default */
|
---|
1330 |
|
---|
1331 | mountprog = MOUNTPROG;
|
---|
1332 | mountvers = 0;
|
---|
1333 | port = 0;
|
---|
1334 | mountport = 0;
|
---|
1335 | nfsprog = 100003;
|
---|
1336 | nfsvers = 0;
|
---|
1337 |
|
---|
1338 | /* parse options */
|
---|
1339 | if (filteropts) for (opt = strtok(filteropts, ","); opt; opt = strtok(NULL, ",")) {
|
---|
1340 | char *opteq = strchr(opt, '=');
|
---|
1341 | if (opteq) {
|
---|
1342 | int val, idx;
|
---|
1343 | static const char options[] ALIGN1 =
|
---|
1344 | /* 0 */ "rsize\0"
|
---|
1345 | /* 1 */ "wsize\0"
|
---|
1346 | /* 2 */ "timeo\0"
|
---|
1347 | /* 3 */ "retrans\0"
|
---|
1348 | /* 4 */ "acregmin\0"
|
---|
1349 | /* 5 */ "acregmax\0"
|
---|
1350 | /* 6 */ "acdirmin\0"
|
---|
1351 | /* 7 */ "acdirmax\0"
|
---|
1352 | /* 8 */ "actimeo\0"
|
---|
1353 | /* 9 */ "retry\0"
|
---|
1354 | /* 10 */ "port\0"
|
---|
1355 | /* 11 */ "mountport\0"
|
---|
1356 | /* 12 */ "mounthost\0"
|
---|
1357 | /* 13 */ "mountprog\0"
|
---|
1358 | /* 14 */ "mountvers\0"
|
---|
1359 | /* 15 */ "nfsprog\0"
|
---|
1360 | /* 16 */ "nfsvers\0"
|
---|
1361 | /* 17 */ "vers\0"
|
---|
1362 | /* 18 */ "proto\0"
|
---|
1363 | /* 19 */ "namlen\0"
|
---|
1364 | /* 20 */ "addr\0";
|
---|
1365 |
|
---|
1366 | *opteq++ = '\0';
|
---|
1367 | idx = index_in_strings(options, opt);
|
---|
1368 | switch (idx) {
|
---|
1369 | case 12: // "mounthost"
|
---|
1370 | mounthost = xstrndup(opteq,
|
---|
1371 | strcspn(opteq, " \t\n\r,"));
|
---|
1372 | continue;
|
---|
1373 | case 18: // "proto"
|
---|
1374 | if (is_prefixed_with(opteq, "tcp"))
|
---|
1375 | tcp = 1;
|
---|
1376 | else if (is_prefixed_with(opteq, "udp"))
|
---|
1377 | tcp = 0;
|
---|
1378 | else
|
---|
1379 | bb_error_msg("warning: unrecognized proto= option");
|
---|
1380 | continue;
|
---|
1381 | case 20: // "addr" - ignore
|
---|
1382 | continue;
|
---|
1383 | case -1: // unknown
|
---|
1384 | if (vfsflags & MS_REMOUNT)
|
---|
1385 | continue;
|
---|
1386 | }
|
---|
1387 |
|
---|
1388 | val = xatoi_positive(opteq);
|
---|
1389 | switch (idx) {
|
---|
1390 | case 0: // "rsize"
|
---|
1391 | data.rsize = val;
|
---|
1392 | continue;
|
---|
1393 | case 1: // "wsize"
|
---|
1394 | data.wsize = val;
|
---|
1395 | continue;
|
---|
1396 | case 2: // "timeo"
|
---|
1397 | data.timeo = val;
|
---|
1398 | continue;
|
---|
1399 | case 3: // "retrans"
|
---|
1400 | data.retrans = val;
|
---|
1401 | continue;
|
---|
1402 | case 4: // "acregmin"
|
---|
1403 | data.acregmin = val;
|
---|
1404 | continue;
|
---|
1405 | case 5: // "acregmax"
|
---|
1406 | data.acregmax = val;
|
---|
1407 | continue;
|
---|
1408 | case 6: // "acdirmin"
|
---|
1409 | data.acdirmin = val;
|
---|
1410 | continue;
|
---|
1411 | case 7: // "acdirmax"
|
---|
1412 | data.acdirmax = val;
|
---|
1413 | continue;
|
---|
1414 | case 8: // "actimeo"
|
---|
1415 | data.acregmin = val;
|
---|
1416 | data.acregmax = val;
|
---|
1417 | data.acdirmin = val;
|
---|
1418 | data.acdirmax = val;
|
---|
1419 | continue;
|
---|
1420 | case 9: // "retry"
|
---|
1421 | retry = val;
|
---|
1422 | continue;
|
---|
1423 | case 10: // "port"
|
---|
1424 | port = val;
|
---|
1425 | continue;
|
---|
1426 | case 11: // "mountport"
|
---|
1427 | mountport = val;
|
---|
1428 | continue;
|
---|
1429 | case 13: // "mountprog"
|
---|
1430 | mountprog = val;
|
---|
1431 | continue;
|
---|
1432 | case 14: // "mountvers"
|
---|
1433 | mountvers = val;
|
---|
1434 | continue;
|
---|
1435 | case 15: // "nfsprog"
|
---|
1436 | nfsprog = val;
|
---|
1437 | continue;
|
---|
1438 | case 16: // "nfsvers"
|
---|
1439 | case 17: // "vers"
|
---|
1440 | nfsvers = val;
|
---|
1441 | continue;
|
---|
1442 | case 19: // "namlen"
|
---|
1443 | //if (nfs_mount_version >= 2)
|
---|
1444 | data.namlen = val;
|
---|
1445 | //else
|
---|
1446 | // bb_error_msg("warning: option namlen is not supported\n");
|
---|
1447 | continue;
|
---|
1448 | default:
|
---|
1449 | bb_error_msg("unknown nfs mount parameter: %s=%d", opt, val);
|
---|
1450 | goto fail;
|
---|
1451 | }
|
---|
1452 | }
|
---|
1453 | else { /* not of the form opt=val */
|
---|
1454 | static const char options[] ALIGN1 =
|
---|
1455 | "bg\0"
|
---|
1456 | "fg\0"
|
---|
1457 | "soft\0"
|
---|
1458 | "hard\0"
|
---|
1459 | "intr\0"
|
---|
1460 | "posix\0"
|
---|
1461 | "cto\0"
|
---|
1462 | "ac\0"
|
---|
1463 | "tcp\0"
|
---|
1464 | "udp\0"
|
---|
1465 | "lock\0"
|
---|
1466 | "rdirplus\0"
|
---|
1467 | "acl\0";
|
---|
1468 | int val = 1;
|
---|
1469 | if (is_prefixed_with(opt, "no")) {
|
---|
1470 | val = 0;
|
---|
1471 | opt += 2;
|
---|
1472 | }
|
---|
1473 | switch (index_in_strings(options, opt)) {
|
---|
1474 | case 0: // "bg"
|
---|
1475 | #if BB_MMU
|
---|
1476 | bg = val;
|
---|
1477 | #endif
|
---|
1478 | break;
|
---|
1479 | case 1: // "fg"
|
---|
1480 | #if BB_MMU
|
---|
1481 | bg = !val;
|
---|
1482 | #endif
|
---|
1483 | break;
|
---|
1484 | case 2: // "soft"
|
---|
1485 | soft = val;
|
---|
1486 | break;
|
---|
1487 | case 3: // "hard"
|
---|
1488 | soft = !val;
|
---|
1489 | break;
|
---|
1490 | case 4: // "intr"
|
---|
1491 | intr = val;
|
---|
1492 | break;
|
---|
1493 | case 5: // "posix"
|
---|
1494 | posix = val;
|
---|
1495 | break;
|
---|
1496 | case 6: // "cto"
|
---|
1497 | nocto = !val;
|
---|
1498 | break;
|
---|
1499 | case 7: // "ac"
|
---|
1500 | noac = !val;
|
---|
1501 | break;
|
---|
1502 | case 8: // "tcp"
|
---|
1503 | tcp = val;
|
---|
1504 | break;
|
---|
1505 | case 9: // "udp"
|
---|
1506 | tcp = !val;
|
---|
1507 | break;
|
---|
1508 | case 10: // "lock"
|
---|
1509 | if (nfs_mount_version >= 3)
|
---|
1510 | nolock = !val;
|
---|
1511 | else
|
---|
1512 | bb_error_msg("warning: option nolock is not supported");
|
---|
1513 | break;
|
---|
1514 | case 11: //rdirplus
|
---|
1515 | nordirplus = !val;
|
---|
1516 | break;
|
---|
1517 | case 12: // acl
|
---|
1518 | noacl = !val;
|
---|
1519 | break;
|
---|
1520 | default:
|
---|
1521 | bb_error_msg("unknown nfs mount option: %s%s", val ? "" : "no", opt);
|
---|
1522 | goto fail;
|
---|
1523 | }
|
---|
1524 | }
|
---|
1525 | }
|
---|
1526 | proto = (tcp) ? IPPROTO_TCP : IPPROTO_UDP;
|
---|
1527 |
|
---|
1528 | data.flags = (soft ? NFS_MOUNT_SOFT : 0)
|
---|
1529 | | (intr ? NFS_MOUNT_INTR : 0)
|
---|
1530 | | (posix ? NFS_MOUNT_POSIX : 0)
|
---|
1531 | | (nocto ? NFS_MOUNT_NOCTO : 0)
|
---|
1532 | | (noac ? NFS_MOUNT_NOAC : 0)
|
---|
1533 | | (nordirplus ? NFS_MOUNT_NORDIRPLUS : 0)
|
---|
1534 | | (noacl ? NFS_MOUNT_NOACL : 0);
|
---|
1535 | if (nfs_mount_version >= 2)
|
---|
1536 | data.flags |= (tcp ? NFS_MOUNT_TCP : 0);
|
---|
1537 | if (nfs_mount_version >= 3)
|
---|
1538 | data.flags |= (nolock ? NFS_MOUNT_NONLM : 0);
|
---|
1539 | if (nfsvers > MAX_NFSPROT || mountvers > MAX_NFSPROT) {
|
---|
1540 | bb_error_msg("NFSv%d not supported", nfsvers);
|
---|
1541 | goto fail;
|
---|
1542 | }
|
---|
1543 | if (nfsvers && !mountvers)
|
---|
1544 | mountvers = (nfsvers < 3) ? 1 : nfsvers;
|
---|
1545 | if (nfsvers && nfsvers < mountvers) {
|
---|
1546 | mountvers = nfsvers;
|
---|
1547 | }
|
---|
1548 |
|
---|
1549 | /* Adjust options if none specified */
|
---|
1550 | if (!data.timeo)
|
---|
1551 | data.timeo = tcp ? 70 : 7;
|
---|
1552 |
|
---|
1553 | data.version = nfs_mount_version;
|
---|
1554 |
|
---|
1555 | if (vfsflags & MS_REMOUNT)
|
---|
1556 | goto do_mount;
|
---|
1557 |
|
---|
1558 | /*
|
---|
1559 | * If the previous mount operation on the same host was
|
---|
1560 | * backgrounded, and the "bg" for this mount is also set,
|
---|
1561 | * give up immediately, to avoid the initial timeout.
|
---|
1562 | */
|
---|
1563 | if (bg && we_saw_this_host_before(hostname)) {
|
---|
1564 | daemonized = daemonize();
|
---|
1565 | if (daemonized <= 0) { /* parent or error */
|
---|
1566 | retval = -daemonized;
|
---|
1567 | goto ret;
|
---|
1568 | }
|
---|
1569 | }
|
---|
1570 |
|
---|
1571 | /* Create mount daemon client */
|
---|
1572 | /* See if the nfs host = mount host. */
|
---|
1573 | if (mounthost) {
|
---|
1574 | if (mounthost[0] >= '0' && mounthost[0] <= '9') {
|
---|
1575 | mount_server_addr.sin_family = AF_INET;
|
---|
1576 | mount_server_addr.sin_addr.s_addr = inet_addr(hostname);
|
---|
1577 | } else {
|
---|
1578 | hp = gethostbyname(mounthost);
|
---|
1579 | if (hp == NULL) {
|
---|
1580 | bb_herror_msg("%s", mounthost);
|
---|
1581 | goto fail;
|
---|
1582 | }
|
---|
1583 | if (hp->h_length != (int)sizeof(struct in_addr)) {
|
---|
1584 | bb_error_msg_and_die("only IPv4 is supported");
|
---|
1585 | }
|
---|
1586 | mount_server_addr.sin_family = AF_INET;
|
---|
1587 | memcpy(&mount_server_addr.sin_addr, hp->h_addr_list[0], sizeof(struct in_addr));
|
---|
1588 | }
|
---|
1589 | }
|
---|
1590 |
|
---|
1591 | /*
|
---|
1592 | * The following loop implements the mount retries. When the mount
|
---|
1593 | * times out, and the "bg" option is set, we background ourself
|
---|
1594 | * and continue trying.
|
---|
1595 | *
|
---|
1596 | * The case where the mount point is not present and the "bg"
|
---|
1597 | * option is set, is treated as a timeout. This is done to
|
---|
1598 | * support nested mounts.
|
---|
1599 | *
|
---|
1600 | * The "retry" count specified by the user is the number of
|
---|
1601 | * minutes to retry before giving up.
|
---|
1602 | */
|
---|
1603 | {
|
---|
1604 | struct timeval total_timeout;
|
---|
1605 | struct timeval retry_timeout;
|
---|
1606 | struct pmap pm_mnt;
|
---|
1607 | time_t t;
|
---|
1608 | time_t prevt;
|
---|
1609 | time_t timeout;
|
---|
1610 |
|
---|
1611 | retry_timeout.tv_sec = 3;
|
---|
1612 | retry_timeout.tv_usec = 0;
|
---|
1613 | total_timeout.tv_sec = 20;
|
---|
1614 | total_timeout.tv_usec = 0;
|
---|
1615 | /* FIXME: use monotonic()? */
|
---|
1616 | timeout = time(NULL) + 60 * retry;
|
---|
1617 | prevt = 0;
|
---|
1618 | t = 30;
|
---|
1619 | retry:
|
---|
1620 | /* Be careful not to use too many CPU cycles */
|
---|
1621 | if (t - prevt < 30)
|
---|
1622 | sleep(30);
|
---|
1623 |
|
---|
1624 | get_mountport(&pm_mnt, &mount_server_addr,
|
---|
1625 | mountprog,
|
---|
1626 | mountvers,
|
---|
1627 | proto,
|
---|
1628 | mountport);
|
---|
1629 | nfsvers = (pm_mnt.pm_vers < 2) ? 2 : pm_mnt.pm_vers;
|
---|
1630 |
|
---|
1631 | /* contact the mount daemon via TCP */
|
---|
1632 | mount_server_addr.sin_port = htons(pm_mnt.pm_port);
|
---|
1633 | msock = RPC_ANYSOCK;
|
---|
1634 |
|
---|
1635 | switch (pm_mnt.pm_prot) {
|
---|
1636 | case IPPROTO_UDP:
|
---|
1637 | mclient = clntudp_create(&mount_server_addr,
|
---|
1638 | pm_mnt.pm_prog,
|
---|
1639 | pm_mnt.pm_vers,
|
---|
1640 | retry_timeout,
|
---|
1641 | &msock);
|
---|
1642 | if (mclient)
|
---|
1643 | break;
|
---|
1644 | mount_server_addr.sin_port = htons(pm_mnt.pm_port);
|
---|
1645 | msock = RPC_ANYSOCK;
|
---|
1646 | case IPPROTO_TCP:
|
---|
1647 | mclient = clnttcp_create(&mount_server_addr,
|
---|
1648 | pm_mnt.pm_prog,
|
---|
1649 | pm_mnt.pm_vers,
|
---|
1650 | &msock, 0, 0);
|
---|
1651 | break;
|
---|
1652 | default:
|
---|
1653 | mclient = NULL;
|
---|
1654 | }
|
---|
1655 | if (!mclient) {
|
---|
1656 | if (!daemonized && prevt == 0)
|
---|
1657 | error_msg_rpc(clnt_spcreateerror(" "));
|
---|
1658 | } else {
|
---|
1659 | enum clnt_stat clnt_stat;
|
---|
1660 |
|
---|
1661 | /* Try to mount hostname:pathname */
|
---|
1662 | mclient->cl_auth = authunix_create_default();
|
---|
1663 |
|
---|
1664 | /* Make pointers in xdr_mountres3 NULL so
|
---|
1665 | * that xdr_array allocates memory for us
|
---|
1666 | */
|
---|
1667 | memset(&status, 0, sizeof(status));
|
---|
1668 |
|
---|
1669 | if (pm_mnt.pm_vers == 3)
|
---|
1670 | clnt_stat = clnt_call(mclient, MOUNTPROC3_MNT,
|
---|
1671 | (xdrproc_t) xdr_dirpath,
|
---|
1672 | (caddr_t) &pathname,
|
---|
1673 | (xdrproc_t) xdr_mountres3,
|
---|
1674 | (caddr_t) &status,
|
---|
1675 | total_timeout);
|
---|
1676 | else
|
---|
1677 | clnt_stat = clnt_call(mclient, MOUNTPROC_MNT,
|
---|
1678 | (xdrproc_t) xdr_dirpath,
|
---|
1679 | (caddr_t) &pathname,
|
---|
1680 | (xdrproc_t) xdr_fhstatus,
|
---|
1681 | (caddr_t) &status,
|
---|
1682 | total_timeout);
|
---|
1683 |
|
---|
1684 | if (clnt_stat == RPC_SUCCESS)
|
---|
1685 | goto prepare_kernel_data; /* we're done */
|
---|
1686 | if (errno != ECONNREFUSED) {
|
---|
1687 | error_msg_rpc(clnt_sperror(mclient, " "));
|
---|
1688 | goto fail; /* don't retry */
|
---|
1689 | }
|
---|
1690 | /* Connection refused */
|
---|
1691 | if (!daemonized && prevt == 0) /* print just once */
|
---|
1692 | error_msg_rpc(clnt_sperror(mclient, " "));
|
---|
1693 | auth_destroy(mclient->cl_auth);
|
---|
1694 | clnt_destroy(mclient);
|
---|
1695 | mclient = NULL;
|
---|
1696 | close(msock);
|
---|
1697 | msock = -1;
|
---|
1698 | }
|
---|
1699 |
|
---|
1700 | /* Timeout. We are going to retry... maybe */
|
---|
1701 | if (!bg)
|
---|
1702 | goto fail;
|
---|
1703 | if (!daemonized) {
|
---|
1704 | daemonized = daemonize();
|
---|
1705 | if (daemonized <= 0) { /* parent or error */
|
---|
1706 | retval = -daemonized;
|
---|
1707 | goto ret;
|
---|
1708 | }
|
---|
1709 | }
|
---|
1710 | prevt = t;
|
---|
1711 | t = time(NULL);
|
---|
1712 | if (t >= timeout)
|
---|
1713 | /* TODO error message */
|
---|
1714 | goto fail;
|
---|
1715 |
|
---|
1716 | goto retry;
|
---|
1717 | }
|
---|
1718 |
|
---|
1719 | prepare_kernel_data:
|
---|
1720 |
|
---|
1721 | if (nfsvers == 2) {
|
---|
1722 | if (status.nfsv2.fhs_status != 0) {
|
---|
1723 | bb_error_msg("%s:%s failed, reason given by server: %s",
|
---|
1724 | hostname, pathname,
|
---|
1725 | nfs_strerror(status.nfsv2.fhs_status));
|
---|
1726 | goto fail;
|
---|
1727 | }
|
---|
1728 | memcpy(data.root.data,
|
---|
1729 | (char *) status.nfsv2.fhstatus_u.fhs_fhandle,
|
---|
1730 | NFS_FHSIZE);
|
---|
1731 | data.root.size = NFS_FHSIZE;
|
---|
1732 | memcpy(data.old_root.data,
|
---|
1733 | (char *) status.nfsv2.fhstatus_u.fhs_fhandle,
|
---|
1734 | NFS_FHSIZE);
|
---|
1735 | } else {
|
---|
1736 | fhandle3 *my_fhandle;
|
---|
1737 | if (status.nfsv3.fhs_status != 0) {
|
---|
1738 | bb_error_msg("%s:%s failed, reason given by server: %s",
|
---|
1739 | hostname, pathname,
|
---|
1740 | nfs_strerror(status.nfsv3.fhs_status));
|
---|
1741 | goto fail;
|
---|
1742 | }
|
---|
1743 | my_fhandle = &status.nfsv3.mountres3_u.mountinfo.fhandle;
|
---|
1744 | memset(data.old_root.data, 0, NFS_FHSIZE);
|
---|
1745 | memset(&data.root, 0, sizeof(data.root));
|
---|
1746 | data.root.size = my_fhandle->fhandle3_len;
|
---|
1747 | memcpy(data.root.data,
|
---|
1748 | (char *) my_fhandle->fhandle3_val,
|
---|
1749 | my_fhandle->fhandle3_len);
|
---|
1750 |
|
---|
1751 | data.flags |= NFS_MOUNT_VER3;
|
---|
1752 | }
|
---|
1753 |
|
---|
1754 | /* Create nfs socket for kernel */
|
---|
1755 | if (tcp) {
|
---|
1756 | if (nfs_mount_version < 3) {
|
---|
1757 | bb_error_msg("NFS over TCP is not supported");
|
---|
1758 | goto fail;
|
---|
1759 | }
|
---|
1760 | fsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
|
---|
1761 | } else
|
---|
1762 | fsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
|
---|
1763 | if (fsock < 0) {
|
---|
1764 | bb_perror_msg("nfs socket");
|
---|
1765 | goto fail;
|
---|
1766 | }
|
---|
1767 | if (bindresvport(fsock, 0) < 0) {
|
---|
1768 | bb_perror_msg("nfs bindresvport");
|
---|
1769 | goto fail;
|
---|
1770 | }
|
---|
1771 | if (port == 0) {
|
---|
1772 | server_addr.sin_port = PMAPPORT;
|
---|
1773 | port = pmap_getport(&server_addr, nfsprog, nfsvers,
|
---|
1774 | tcp ? IPPROTO_TCP : IPPROTO_UDP);
|
---|
1775 | if (port == 0)
|
---|
1776 | port = NFS_PORT;
|
---|
1777 | }
|
---|
1778 | server_addr.sin_port = htons(port);
|
---|
1779 |
|
---|
1780 | /* Prepare data structure for kernel */
|
---|
1781 | data.fd = fsock;
|
---|
1782 | memcpy((char *) &data.addr, (char *) &server_addr, sizeof(data.addr));
|
---|
1783 | strncpy(data.hostname, hostname, sizeof(data.hostname));
|
---|
1784 |
|
---|
1785 | /* Clean up */
|
---|
1786 | auth_destroy(mclient->cl_auth);
|
---|
1787 | clnt_destroy(mclient);
|
---|
1788 | close(msock);
|
---|
1789 | msock = -1;
|
---|
1790 |
|
---|
1791 | if (bg) {
|
---|
1792 | /* We must wait until mount directory is available */
|
---|
1793 | struct stat statbuf;
|
---|
1794 | int delay = 1;
|
---|
1795 | while (stat(mp->mnt_dir, &statbuf) == -1) {
|
---|
1796 | if (!daemonized) {
|
---|
1797 | daemonized = daemonize();
|
---|
1798 | if (daemonized <= 0) { /* parent or error */
|
---|
1799 | /* FIXME: parent doesn't close fsock - ??! */
|
---|
1800 | retval = -daemonized;
|
---|
1801 | goto ret;
|
---|
1802 | }
|
---|
1803 | }
|
---|
1804 | sleep(delay); /* 1, 2, 4, 8, 16, 30, ... */
|
---|
1805 | delay *= 2;
|
---|
1806 | if (delay > 30)
|
---|
1807 | delay = 30;
|
---|
1808 | }
|
---|
1809 | }
|
---|
1810 |
|
---|
1811 | /* Perform actual mount */
|
---|
1812 | do_mount:
|
---|
1813 | retval = mount_it_now(mp, vfsflags, (char*)&data);
|
---|
1814 | goto ret;
|
---|
1815 |
|
---|
1816 | /* Abort */
|
---|
1817 | fail:
|
---|
1818 | if (msock >= 0) {
|
---|
1819 | if (mclient) {
|
---|
1820 | auth_destroy(mclient->cl_auth);
|
---|
1821 | clnt_destroy(mclient);
|
---|
1822 | }
|
---|
1823 | close(msock);
|
---|
1824 | }
|
---|
1825 | if (fsock >= 0)
|
---|
1826 | close(fsock);
|
---|
1827 |
|
---|
1828 | ret:
|
---|
1829 | free(hostname);
|
---|
1830 | free(mounthost);
|
---|
1831 | free(filteropts);
|
---|
1832 | return retval;
|
---|
1833 | }
|
---|
1834 |
|
---|
1835 | #else // !ENABLE_FEATURE_MOUNT_NFS
|
---|
1836 |
|
---|
1837 | /* Linux 2.6.23+ supports nfs mounts with options passed as a string.
|
---|
1838 | * For older kernels, you must build busybox with ENABLE_FEATURE_MOUNT_NFS.
|
---|
1839 | * (However, note that then you lose any chances that NFS over IPv6 would work).
|
---|
1840 | */
|
---|
1841 | static int nfsmount(struct mntent *mp, unsigned long vfsflags, char *filteropts)
|
---|
1842 | {
|
---|
1843 | len_and_sockaddr *lsa;
|
---|
1844 | char *opts;
|
---|
1845 | char *end;
|
---|
1846 | char *dotted;
|
---|
1847 | int ret;
|
---|
1848 |
|
---|
1849 | # if ENABLE_FEATURE_IPV6
|
---|
1850 | end = strchr(mp->mnt_fsname, ']');
|
---|
1851 | if (end && end[1] == ':')
|
---|
1852 | end++;
|
---|
1853 | else
|
---|
1854 | # endif
|
---|
1855 | /* mount_main() guarantees that ':' is there */
|
---|
1856 | end = strchr(mp->mnt_fsname, ':');
|
---|
1857 |
|
---|
1858 | *end = '\0';
|
---|
1859 | lsa = xhost2sockaddr(mp->mnt_fsname, /*port:*/ 0);
|
---|
1860 | *end = ':';
|
---|
1861 | dotted = xmalloc_sockaddr2dotted_noport(&lsa->u.sa);
|
---|
1862 | if (ENABLE_FEATURE_CLEAN_UP) free(lsa);
|
---|
1863 | opts = xasprintf("%s%saddr=%s",
|
---|
1864 | filteropts ? filteropts : "",
|
---|
1865 | filteropts ? "," : "",
|
---|
1866 | dotted
|
---|
1867 | );
|
---|
1868 | if (ENABLE_FEATURE_CLEAN_UP) free(dotted);
|
---|
1869 | ret = mount_it_now(mp, vfsflags, opts);
|
---|
1870 | if (ENABLE_FEATURE_CLEAN_UP) free(opts);
|
---|
1871 |
|
---|
1872 | return ret;
|
---|
1873 | }
|
---|
1874 |
|
---|
1875 | #endif // !ENABLE_FEATURE_MOUNT_NFS
|
---|
1876 |
|
---|
1877 | // Mount one directory. Handles CIFS, NFS, loopback, autobind, and filesystem
|
---|
1878 | // type detection. Returns 0 for success, nonzero for failure.
|
---|
1879 | // NB: mp->xxx fields may be trashed on exit
|
---|
1880 | static int singlemount(struct mntent *mp, int ignore_busy)
|
---|
1881 | {
|
---|
1882 | int rc = -1;
|
---|
1883 | unsigned long vfsflags;
|
---|
1884 | char *loopFile = NULL, *filteropts = NULL;
|
---|
1885 | llist_t *fl = NULL;
|
---|
1886 | struct stat st;
|
---|
1887 |
|
---|
1888 | errno = 0;
|
---|
1889 |
|
---|
1890 | vfsflags = parse_mount_options(mp->mnt_opts, &filteropts);
|
---|
1891 |
|
---|
1892 | // Treat fstype "auto" as unspecified
|
---|
1893 | if (mp->mnt_type && strcmp(mp->mnt_type, "auto") == 0)
|
---|
1894 | mp->mnt_type = NULL;
|
---|
1895 |
|
---|
1896 | // Might this be a virtual filesystem?
|
---|
1897 | if (ENABLE_FEATURE_MOUNT_HELPERS && strchr(mp->mnt_fsname, '#')) {
|
---|
1898 | char *args[35];
|
---|
1899 | char *s;
|
---|
1900 | int n;
|
---|
1901 | // fsname: "cmd#arg1#arg2..."
|
---|
1902 | // WARNING: allows execution of arbitrary commands!
|
---|
1903 | // Try "mount 'sh#-c#sh' bogus_dir".
|
---|
1904 | // It is safe ONLY because non-root
|
---|
1905 | // cannot use two-argument mount command
|
---|
1906 | // and using one-argument "mount 'sh#-c#sh'" doesn't work:
|
---|
1907 | // "mount: can't find sh#-c#sh in /etc/fstab"
|
---|
1908 | // (if /etc/fstab has it, it's ok: root sets up /etc/fstab).
|
---|
1909 |
|
---|
1910 | s = mp->mnt_fsname;
|
---|
1911 | n = 0;
|
---|
1912 | args[n++] = s;
|
---|
1913 | while (*s && n < 35 - 2) {
|
---|
1914 | if (*s++ == '#' && *s != '#') {
|
---|
1915 | s[-1] = '\0';
|
---|
1916 | args[n++] = s;
|
---|
1917 | }
|
---|
1918 | }
|
---|
1919 | args[n++] = mp->mnt_dir;
|
---|
1920 | args[n] = NULL;
|
---|
1921 | rc = spawn_and_wait(args);
|
---|
1922 | goto report_error;
|
---|
1923 | }
|
---|
1924 |
|
---|
1925 | // Might this be an CIFS filesystem?
|
---|
1926 | if (ENABLE_FEATURE_MOUNT_CIFS
|
---|
1927 | && (!mp->mnt_type || strcmp(mp->mnt_type, "cifs") == 0)
|
---|
1928 | && (mp->mnt_fsname[0] == '/' || mp->mnt_fsname[0] == '\\')
|
---|
1929 | && mp->mnt_fsname[0] == mp->mnt_fsname[1]
|
---|
1930 | ) {
|
---|
1931 | int len;
|
---|
1932 | char c;
|
---|
1933 | char *hostname, *share;
|
---|
1934 | char *dotted, *ip;
|
---|
1935 | len_and_sockaddr *lsa;
|
---|
1936 |
|
---|
1937 | // Parse mp->mnt_fsname of the form "//hostname/share[/dir1/dir2]"
|
---|
1938 |
|
---|
1939 | hostname = mp->mnt_fsname + 2;
|
---|
1940 | len = strcspn(hostname, "/\\");
|
---|
1941 | share = hostname + len + 1;
|
---|
1942 | if (len == 0 // 3rd char is a [back]slash (IOW: empty hostname)
|
---|
1943 | || share[-1] == '\0' // no [back]slash after hostname
|
---|
1944 | || share[0] == '\0' // empty share name
|
---|
1945 | ) {
|
---|
1946 | goto report_error;
|
---|
1947 | }
|
---|
1948 | c = share[-1];
|
---|
1949 | share[-1] = '\0';
|
---|
1950 | len = strcspn(share, "/\\");
|
---|
1951 |
|
---|
1952 | // "unc=\\hostname\share" option is mandatory
|
---|
1953 | // after CIFS option parsing was rewritten in Linux 3.4.
|
---|
1954 | // Must use backslashes.
|
---|
1955 | // If /dir1/dir2 is present, also add "prefixpath=dir1/dir2"
|
---|
1956 | {
|
---|
1957 | char *unc = xasprintf(
|
---|
1958 | share[len] != '\0' /* "/dir1/dir2" exists? */
|
---|
1959 | ? "unc=\\\\%s\\%.*s,prefixpath=%s"
|
---|
1960 | : "unc=\\\\%s\\%.*s",
|
---|
1961 | hostname,
|
---|
1962 | len, share,
|
---|
1963 | share + len + 1 /* "dir1/dir2" */
|
---|
1964 | );
|
---|
1965 | parse_mount_options(unc, &filteropts);
|
---|
1966 | if (ENABLE_FEATURE_CLEAN_UP) free(unc);
|
---|
1967 | }
|
---|
1968 |
|
---|
1969 | lsa = host2sockaddr(hostname, 0);
|
---|
1970 | share[-1] = c;
|
---|
1971 | if (!lsa)
|
---|
1972 | goto report_error;
|
---|
1973 |
|
---|
1974 | // Insert "ip=..." option into options
|
---|
1975 | dotted = xmalloc_sockaddr2dotted_noport(&lsa->u.sa);
|
---|
1976 | if (ENABLE_FEATURE_CLEAN_UP) free(lsa);
|
---|
1977 | ip = xasprintf("ip=%s", dotted);
|
---|
1978 | if (ENABLE_FEATURE_CLEAN_UP) free(dotted);
|
---|
1979 | parse_mount_options(ip, &filteropts);
|
---|
1980 | if (ENABLE_FEATURE_CLEAN_UP) free(ip);
|
---|
1981 |
|
---|
1982 | mp->mnt_type = (char*)"cifs";
|
---|
1983 | rc = mount_it_now(mp, vfsflags, filteropts);
|
---|
1984 |
|
---|
1985 | goto report_error;
|
---|
1986 | }
|
---|
1987 |
|
---|
1988 | // Might this be an NFS filesystem?
|
---|
1989 | if ((!mp->mnt_type || is_prefixed_with(mp->mnt_type, "nfs"))
|
---|
1990 | && strchr(mp->mnt_fsname, ':') != NULL
|
---|
1991 | ) {
|
---|
1992 | if (!mp->mnt_type)
|
---|
1993 | mp->mnt_type = (char*)"nfs";
|
---|
1994 | rc = nfsmount(mp, vfsflags, filteropts);
|
---|
1995 | goto report_error;
|
---|
1996 | }
|
---|
1997 |
|
---|
1998 | // Look at the file. (Not found isn't a failure for remount, or for
|
---|
1999 | // a synthetic filesystem like proc or sysfs.)
|
---|
2000 | // (We use stat, not lstat, in order to allow
|
---|
2001 | // mount symlink_to_file_or_blkdev dir)
|
---|
2002 | if (!stat(mp->mnt_fsname, &st)
|
---|
2003 | && !(vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE))
|
---|
2004 | ) {
|
---|
2005 | // Do we need to allocate a loopback device for it?
|
---|
2006 | if (ENABLE_FEATURE_MOUNT_LOOP && S_ISREG(st.st_mode)) {
|
---|
2007 | loopFile = bb_simplify_path(mp->mnt_fsname);
|
---|
2008 | mp->mnt_fsname = NULL; // will receive malloced loop dev name
|
---|
2009 | if (set_loop(&mp->mnt_fsname, loopFile, 0, /*ro:*/ (vfsflags & MS_RDONLY)) < 0) {
|
---|
2010 | if (errno == EPERM || errno == EACCES)
|
---|
2011 | bb_error_msg(bb_msg_perm_denied_are_you_root);
|
---|
2012 | else
|
---|
2013 | bb_perror_msg("can't setup loop device");
|
---|
2014 | return errno;
|
---|
2015 | }
|
---|
2016 |
|
---|
2017 | // Autodetect bind mounts
|
---|
2018 | } else if (S_ISDIR(st.st_mode) && !mp->mnt_type)
|
---|
2019 | vfsflags |= MS_BIND;
|
---|
2020 | }
|
---|
2021 |
|
---|
2022 | // If we know the fstype (or don't need to), jump straight
|
---|
2023 | // to the actual mount.
|
---|
2024 | if (mp->mnt_type || (vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE))) {
|
---|
2025 | char *next;
|
---|
2026 | for (;;) {
|
---|
2027 | next = mp->mnt_type ? strchr(mp->mnt_type, ',') : NULL;
|
---|
2028 | if (next)
|
---|
2029 | *next = '\0';
|
---|
2030 | rc = mount_it_now(mp, vfsflags, filteropts);
|
---|
2031 | if (rc == 0 || !next)
|
---|
2032 | break;
|
---|
2033 | mp->mnt_type = next + 1;
|
---|
2034 | }
|
---|
2035 | } else {
|
---|
2036 | // Loop through filesystem types until mount succeeds
|
---|
2037 | // or we run out
|
---|
2038 |
|
---|
2039 | // Initialize list of block backed filesystems.
|
---|
2040 | // This has to be done here so that during "mount -a",
|
---|
2041 | // mounts after /proc shows up can autodetect.
|
---|
2042 | if (!fslist) {
|
---|
2043 | fslist = get_block_backed_filesystems();
|
---|
2044 | if (ENABLE_FEATURE_CLEAN_UP && fslist)
|
---|
2045 | atexit(delete_block_backed_filesystems);
|
---|
2046 | }
|
---|
2047 |
|
---|
2048 | for (fl = fslist; fl; fl = fl->link) {
|
---|
2049 | mp->mnt_type = fl->data;
|
---|
2050 | rc = mount_it_now(mp, vfsflags, filteropts);
|
---|
2051 | if (rc == 0)
|
---|
2052 | break;
|
---|
2053 | }
|
---|
2054 | }
|
---|
2055 |
|
---|
2056 | // If mount failed, clean up loop file (if any).
|
---|
2057 | if (ENABLE_FEATURE_MOUNT_LOOP && rc && loopFile) {
|
---|
2058 | del_loop(mp->mnt_fsname);
|
---|
2059 | if (ENABLE_FEATURE_CLEAN_UP) {
|
---|
2060 | free(loopFile);
|
---|
2061 | /* No, "rc != 0" needs it: free(mp->mnt_fsname); */
|
---|
2062 | }
|
---|
2063 | }
|
---|
2064 |
|
---|
2065 | report_error:
|
---|
2066 | if (ENABLE_FEATURE_CLEAN_UP)
|
---|
2067 | free(filteropts);
|
---|
2068 |
|
---|
2069 | if (errno == EBUSY && ignore_busy)
|
---|
2070 | return 0;
|
---|
2071 | if (errno == ENOENT && (vfsflags & MOUNT_NOFAIL))
|
---|
2072 | return 0;
|
---|
2073 | if (rc != 0)
|
---|
2074 | bb_perror_msg("mounting %s on %s failed", mp->mnt_fsname, mp->mnt_dir);
|
---|
2075 | return rc;
|
---|
2076 | }
|
---|
2077 |
|
---|
2078 | // -O support
|
---|
2079 | // -O interprets a list of filter options which select whether a mount
|
---|
2080 | // point will be mounted: only mounts with options matching *all* filtering
|
---|
2081 | // options will be selected.
|
---|
2082 | // By default each -O filter option must be present in the list of mount
|
---|
2083 | // options, but if it is prefixed by "no" then it must be absent.
|
---|
2084 | // For example,
|
---|
2085 | // -O a,nob,c matches -o a,c but fails to match -o a,b,c
|
---|
2086 | // (and also fails to match -o a because -o c is absent).
|
---|
2087 | //
|
---|
2088 | // It is different from -t in that each option is matched exactly; a leading
|
---|
2089 | // "no" at the beginning of one option does not negate the rest.
|
---|
2090 | static int match_opt(const char *fs_opt_in, const char *O_opt)
|
---|
2091 | {
|
---|
2092 | if (!O_opt)
|
---|
2093 | return 1;
|
---|
2094 |
|
---|
2095 | while (*O_opt) {
|
---|
2096 | const char *fs_opt = fs_opt_in;
|
---|
2097 | int O_len;
|
---|
2098 | int match;
|
---|
2099 |
|
---|
2100 | // If option begins with "no" then treat as an inverted match:
|
---|
2101 | // matching is a failure
|
---|
2102 | match = 0;
|
---|
2103 | if (O_opt[0] == 'n' && O_opt[1] == 'o') {
|
---|
2104 | match = 1;
|
---|
2105 | O_opt += 2;
|
---|
2106 | }
|
---|
2107 | // Isolate the current O option
|
---|
2108 | O_len = strchrnul(O_opt, ',') - O_opt;
|
---|
2109 | // Check for a match against existing options
|
---|
2110 | while (1) {
|
---|
2111 | if (strncmp(fs_opt, O_opt, O_len) == 0
|
---|
2112 | && (fs_opt[O_len] == '\0' || fs_opt[O_len] == ',')
|
---|
2113 | ) {
|
---|
2114 | if (match)
|
---|
2115 | return 0; // "no" prefix, but option found
|
---|
2116 | match = 1; // current O option found, go check next one
|
---|
2117 | break;
|
---|
2118 | }
|
---|
2119 | fs_opt = strchr(fs_opt, ',');
|
---|
2120 | if (!fs_opt)
|
---|
2121 | break;
|
---|
2122 | fs_opt++;
|
---|
2123 | }
|
---|
2124 | if (match == 0)
|
---|
2125 | return 0; // match wanted but not found
|
---|
2126 | if (O_opt[O_len] == '\0') // end?
|
---|
2127 | break;
|
---|
2128 | // Step to the next O option
|
---|
2129 | O_opt += O_len + 1;
|
---|
2130 | }
|
---|
2131 | // If we get here then everything matched
|
---|
2132 | return 1;
|
---|
2133 | }
|
---|
2134 |
|
---|
2135 | // Parse options, if necessary parse fstab/mtab, and call singlemount for
|
---|
2136 | // each directory to be mounted.
|
---|
2137 | int mount_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
2138 | int mount_main(int argc UNUSED_PARAM, char **argv)
|
---|
2139 | {
|
---|
2140 | char *cmdopts = xzalloc(1);
|
---|
2141 | char *fstype = NULL;
|
---|
2142 | char *O_optmatch = NULL;
|
---|
2143 | char *storage_path;
|
---|
2144 | llist_t *lst_o = NULL;
|
---|
2145 | const char *fstabname = "/etc/fstab";
|
---|
2146 | FILE *fstab;
|
---|
2147 | int i, j;
|
---|
2148 | int rc = EXIT_SUCCESS;
|
---|
2149 | unsigned long cmdopt_flags;
|
---|
2150 | unsigned opt;
|
---|
2151 | struct mntent mtpair[2], *mtcur = mtpair;
|
---|
2152 | IF_NOT_DESKTOP(const int nonroot = 0;)
|
---|
2153 |
|
---|
2154 | IF_DESKTOP(int nonroot = ) sanitize_env_if_suid();
|
---|
2155 |
|
---|
2156 | INIT_G();
|
---|
2157 |
|
---|
2158 | // Parse long options, like --bind and --move. Note that -o option
|
---|
2159 | // and --option are synonymous. Yes, this means --remount,rw works.
|
---|
2160 | for (i = j = 1; argv[i]; i++) {
|
---|
2161 | if (argv[i][0] == '-' && argv[i][1] == '-')
|
---|
2162 | append_mount_options(&cmdopts, argv[i] + 2);
|
---|
2163 | else
|
---|
2164 | argv[j++] = argv[i];
|
---|
2165 | }
|
---|
2166 | argv[j] = NULL;
|
---|
2167 |
|
---|
2168 | // Parse remaining options
|
---|
2169 | // Max 2 params; -o is a list, -v is a counter
|
---|
2170 | opt_complementary = "?2o::" IF_FEATURE_MOUNT_VERBOSE("vv");
|
---|
2171 | opt = getopt32(argv, OPTION_STR, &lst_o, &fstype, &O_optmatch
|
---|
2172 | IF_FEATURE_MOUNT_OTHERTAB(, &fstabname)
|
---|
2173 | IF_FEATURE_MOUNT_VERBOSE(, &verbose));
|
---|
2174 | while (lst_o) append_mount_options(&cmdopts, llist_pop(&lst_o)); // -o
|
---|
2175 | if (opt & OPT_r) append_mount_options(&cmdopts, "ro"); // -r
|
---|
2176 | if (opt & OPT_w) append_mount_options(&cmdopts, "rw"); // -w
|
---|
2177 | argv += optind;
|
---|
2178 |
|
---|
2179 | // If we have no arguments, show currently mounted filesystems
|
---|
2180 | if (!argv[0]) {
|
---|
2181 | if (!(opt & OPT_a)) {
|
---|
2182 | FILE *mountTable = setmntent(bb_path_mtab_file, "r");
|
---|
2183 |
|
---|
2184 | if (!mountTable)
|
---|
2185 | bb_error_msg_and_die("no %s", bb_path_mtab_file);
|
---|
2186 |
|
---|
2187 | while (getmntent_r(mountTable, &mtpair[0], getmntent_buf,
|
---|
2188 | GETMNTENT_BUFSIZE))
|
---|
2189 | {
|
---|
2190 | // Don't show rootfs. FIXME: why??
|
---|
2191 | // util-linux 2.12a happily shows rootfs...
|
---|
2192 | //if (strcmp(mtpair->mnt_fsname, "rootfs") == 0) continue;
|
---|
2193 |
|
---|
2194 | if (!fstype || strcmp(mtpair->mnt_type, fstype) == 0)
|
---|
2195 | printf("%s on %s type %s (%s)\n", mtpair->mnt_fsname,
|
---|
2196 | mtpair->mnt_dir, mtpair->mnt_type,
|
---|
2197 | mtpair->mnt_opts);
|
---|
2198 | }
|
---|
2199 | if (ENABLE_FEATURE_CLEAN_UP)
|
---|
2200 | endmntent(mountTable);
|
---|
2201 | return EXIT_SUCCESS;
|
---|
2202 | }
|
---|
2203 | storage_path = NULL;
|
---|
2204 | } else {
|
---|
2205 | // When we have two arguments, the second is the directory and we can
|
---|
2206 | // skip looking at fstab entirely. We can always abspath() the directory
|
---|
2207 | // argument when we get it.
|
---|
2208 | if (argv[1]) {
|
---|
2209 | if (nonroot)
|
---|
2210 | bb_error_msg_and_die(bb_msg_you_must_be_root);
|
---|
2211 | mtpair->mnt_fsname = argv[0];
|
---|
2212 | mtpair->mnt_dir = argv[1];
|
---|
2213 | mtpair->mnt_type = fstype;
|
---|
2214 | mtpair->mnt_opts = cmdopts;
|
---|
2215 | resolve_mount_spec(&mtpair->mnt_fsname);
|
---|
2216 | rc = singlemount(mtpair, /*ignore_busy:*/ 0);
|
---|
2217 | return rc;
|
---|
2218 | }
|
---|
2219 | storage_path = bb_simplify_path(argv[0]); // malloced
|
---|
2220 | }
|
---|
2221 |
|
---|
2222 | // Past this point, we are handling either "mount -a [opts]"
|
---|
2223 | // or "mount [opts] single_param"
|
---|
2224 |
|
---|
2225 | cmdopt_flags = parse_mount_options(cmdopts, NULL);
|
---|
2226 | if (nonroot && (cmdopt_flags & ~MS_SILENT)) // Non-root users cannot specify flags
|
---|
2227 | bb_error_msg_and_die(bb_msg_you_must_be_root);
|
---|
2228 |
|
---|
2229 | // If we have a shared subtree flag, don't worry about fstab or mtab.
|
---|
2230 | if (ENABLE_FEATURE_MOUNT_FLAGS
|
---|
2231 | && (cmdopt_flags & (MS_SHARED | MS_PRIVATE | MS_SLAVE | MS_UNBINDABLE))
|
---|
2232 | ) {
|
---|
2233 | // verbose_mount(source, target, type, flags, data)
|
---|
2234 | rc = verbose_mount("", argv[0], "", cmdopt_flags, "");
|
---|
2235 | if (rc)
|
---|
2236 | bb_simple_perror_msg_and_die(argv[0]);
|
---|
2237 | return rc;
|
---|
2238 | }
|
---|
2239 |
|
---|
2240 | // A malicious user could overmount /usr without this.
|
---|
2241 | if (ENABLE_FEATURE_MOUNT_OTHERTAB && nonroot)
|
---|
2242 | fstabname = "/etc/fstab";
|
---|
2243 | // Open either fstab or mtab
|
---|
2244 | if (cmdopt_flags & MS_REMOUNT) {
|
---|
2245 | // WARNING. I am not sure this matches util-linux's
|
---|
2246 | // behavior. It's possible util-linux does not
|
---|
2247 | // take -o opts from mtab (takes only mount source).
|
---|
2248 | fstabname = bb_path_mtab_file;
|
---|
2249 | }
|
---|
2250 | fstab = setmntent(fstabname, "r");
|
---|
2251 | if (!fstab)
|
---|
2252 | bb_perror_msg_and_die("can't read '%s'", fstabname);
|
---|
2253 |
|
---|
2254 | // Loop through entries until we find what we're looking for
|
---|
2255 | memset(mtpair, 0, sizeof(mtpair));
|
---|
2256 | for (;;) {
|
---|
2257 | struct mntent *mtother = (mtcur==mtpair ? mtpair+1 : mtpair);
|
---|
2258 |
|
---|
2259 | // Get next fstab entry
|
---|
2260 | if (!getmntent_r(fstab, mtcur, getmntent_buf
|
---|
2261 | + (mtcur==mtpair ? GETMNTENT_BUFSIZE/2 : 0),
|
---|
2262 | GETMNTENT_BUFSIZE/2)
|
---|
2263 | ) { // End of fstab/mtab is reached
|
---|
2264 | mtcur = mtother; // the thing we found last time
|
---|
2265 | break;
|
---|
2266 | }
|
---|
2267 |
|
---|
2268 | // If we're trying to mount something specific and this isn't it,
|
---|
2269 | // skip it. Note we must match the exact text in fstab (ala
|
---|
2270 | // "proc") or a full path from root
|
---|
2271 | if (argv[0]) {
|
---|
2272 |
|
---|
2273 | // Is this what we're looking for?
|
---|
2274 | if (strcmp(argv[0], mtcur->mnt_fsname) != 0
|
---|
2275 | && strcmp(storage_path, mtcur->mnt_fsname) != 0
|
---|
2276 | && strcmp(argv[0], mtcur->mnt_dir) != 0
|
---|
2277 | && strcmp(storage_path, mtcur->mnt_dir) != 0
|
---|
2278 | ) {
|
---|
2279 | continue; // no
|
---|
2280 | }
|
---|
2281 |
|
---|
2282 | // Remember this entry. Something later may have
|
---|
2283 | // overmounted it, and we want the _last_ match.
|
---|
2284 | mtcur = mtother;
|
---|
2285 |
|
---|
2286 | // If we're mounting all
|
---|
2287 | } else {
|
---|
2288 | struct mntent *mp;
|
---|
2289 | // No, mount -a won't mount anything,
|
---|
2290 | // even user mounts, for mere humans
|
---|
2291 | if (nonroot)
|
---|
2292 | bb_error_msg_and_die(bb_msg_you_must_be_root);
|
---|
2293 |
|
---|
2294 | // Does type match? (NULL matches always)
|
---|
2295 | if (!match_fstype(mtcur, fstype))
|
---|
2296 | continue;
|
---|
2297 |
|
---|
2298 | // Skip noauto and swap anyway
|
---|
2299 | if ((parse_mount_options(mtcur->mnt_opts, NULL) & (MOUNT_NOAUTO | MOUNT_SWAP))
|
---|
2300 | // swap is bogus "fstype", parse_mount_options can't check fstypes
|
---|
2301 | || strcasecmp(mtcur->mnt_type, "swap") == 0
|
---|
2302 | ) {
|
---|
2303 | continue;
|
---|
2304 | }
|
---|
2305 |
|
---|
2306 | // Does (at least one) option match?
|
---|
2307 | // (NULL matches always)
|
---|
2308 | if (!match_opt(mtcur->mnt_opts, O_optmatch))
|
---|
2309 | continue;
|
---|
2310 |
|
---|
2311 | resolve_mount_spec(&mtcur->mnt_fsname);
|
---|
2312 |
|
---|
2313 | // NFS mounts want this to be xrealloc-able
|
---|
2314 | mtcur->mnt_opts = xstrdup(mtcur->mnt_opts);
|
---|
2315 |
|
---|
2316 | // If nothing is mounted on this directory...
|
---|
2317 | // (otherwise repeated "mount -a" mounts everything again)
|
---|
2318 | mp = find_mount_point(mtcur->mnt_dir, /*subdir_too:*/ 0);
|
---|
2319 | // We do not check fsname match of found mount point -
|
---|
2320 | // "/" may have fsname of "/dev/root" while fstab
|
---|
2321 | // says "/dev/something_else".
|
---|
2322 | if (mp) {
|
---|
2323 | if (verbose) {
|
---|
2324 | bb_error_msg("according to %s, "
|
---|
2325 | "%s is already mounted on %s",
|
---|
2326 | bb_path_mtab_file,
|
---|
2327 | mp->mnt_fsname, mp->mnt_dir);
|
---|
2328 | }
|
---|
2329 | } else {
|
---|
2330 | // ...mount this thing
|
---|
2331 | if (singlemount(mtcur, /*ignore_busy:*/ 1)) {
|
---|
2332 | // Count number of failed mounts
|
---|
2333 | rc++;
|
---|
2334 | }
|
---|
2335 | }
|
---|
2336 | free(mtcur->mnt_opts);
|
---|
2337 | }
|
---|
2338 | }
|
---|
2339 |
|
---|
2340 | // End of fstab/mtab is reached.
|
---|
2341 | // Were we looking for something specific?
|
---|
2342 | if (argv[0]) { // yes
|
---|
2343 | unsigned long l;
|
---|
2344 |
|
---|
2345 | // If we didn't find anything, complain
|
---|
2346 | if (!mtcur->mnt_fsname)
|
---|
2347 | bb_error_msg_and_die("can't find %s in %s",
|
---|
2348 | argv[0], fstabname);
|
---|
2349 |
|
---|
2350 | // What happens when we try to "mount swap_partition"?
|
---|
2351 | // (fstab containts "swap_partition swap swap defaults 0 0")
|
---|
2352 | // util-linux-ng 2.13.1 does this:
|
---|
2353 | // stat("/sbin/mount.swap", 0x7fff62a3a350) = -1 ENOENT (No such file or directory)
|
---|
2354 | // mount("swap_partition", "swap", "swap", MS_MGC_VAL, NULL) = -1 ENOENT (No such file or directory)
|
---|
2355 | // lstat("swap", 0x7fff62a3a640) = -1 ENOENT (No such file or directory)
|
---|
2356 | // write(2, "mount: mount point swap does not exist\n", 39) = 39
|
---|
2357 | // exit_group(32) = ?
|
---|
2358 | #if 0
|
---|
2359 | // In case we want to simply skip swap partitions:
|
---|
2360 | l = parse_mount_options(mtcur->mnt_opts, NULL);
|
---|
2361 | if ((l & MOUNT_SWAP)
|
---|
2362 | // swap is bogus "fstype", parse_mount_options can't check fstypes
|
---|
2363 | || strcasecmp(mtcur->mnt_type, "swap") == 0
|
---|
2364 | ) {
|
---|
2365 | goto ret;
|
---|
2366 | }
|
---|
2367 | #endif
|
---|
2368 | if (nonroot) {
|
---|
2369 | // fstab must have "users" or "user"
|
---|
2370 | l = parse_mount_options(mtcur->mnt_opts, NULL);
|
---|
2371 | if (!(l & MOUNT_USERS))
|
---|
2372 | bb_error_msg_and_die(bb_msg_you_must_be_root);
|
---|
2373 | }
|
---|
2374 |
|
---|
2375 | //util-linux-2.12 does not do this check.
|
---|
2376 | //// If nothing is mounted on this directory...
|
---|
2377 | //// (otherwise repeated "mount FOO" mounts FOO again)
|
---|
2378 | //mp = find_mount_point(mtcur->mnt_dir, /*subdir_too:*/ 0);
|
---|
2379 | //if (mp) {
|
---|
2380 | // bb_error_msg("according to %s, "
|
---|
2381 | // "%s is already mounted on %s",
|
---|
2382 | // bb_path_mtab_file,
|
---|
2383 | // mp->mnt_fsname, mp->mnt_dir);
|
---|
2384 | //} else {
|
---|
2385 | // ...mount the last thing we found
|
---|
2386 | mtcur->mnt_opts = xstrdup(mtcur->mnt_opts);
|
---|
2387 | append_mount_options(&(mtcur->mnt_opts), cmdopts);
|
---|
2388 | resolve_mount_spec(&mtpair->mnt_fsname);
|
---|
2389 | rc = singlemount(mtcur, /*ignore_busy:*/ 0);
|
---|
2390 | if (ENABLE_FEATURE_CLEAN_UP)
|
---|
2391 | free(mtcur->mnt_opts);
|
---|
2392 | //}
|
---|
2393 | }
|
---|
2394 |
|
---|
2395 | //ret:
|
---|
2396 | if (ENABLE_FEATURE_CLEAN_UP)
|
---|
2397 | endmntent(fstab);
|
---|
2398 | if (ENABLE_FEATURE_CLEAN_UP) {
|
---|
2399 | free(storage_path);
|
---|
2400 | free(cmdopts);
|
---|
2401 | }
|
---|
2402 |
|
---|
2403 | //TODO: exitcode should be ORed mask of (from "man mount"):
|
---|
2404 | // 0 success
|
---|
2405 | // 1 incorrect invocation or permissions
|
---|
2406 | // 2 system error (out of memory, cannot fork, no more loop devices)
|
---|
2407 | // 4 internal mount bug or missing nfs support in mount
|
---|
2408 | // 8 user interrupt
|
---|
2409 | //16 problems writing or locking /etc/mtab
|
---|
2410 | //32 mount failure
|
---|
2411 | //64 some mount succeeded
|
---|
2412 | return rc;
|
---|
2413 | }
|
---|