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 tarball for details.
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10 | */
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11 |
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12 | /* todo:
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13 | * bb_getopt_ulflags();
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14 | */
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15 |
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16 | /* Design notes: There is no spec for mount. Remind me to write one.
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17 |
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18 | mount_main() calls singlemount() which calls mount_it_now().
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19 |
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20 | mount_main() can loop through /etc/fstab for mount -a
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21 | singlemount() can loop through /etc/filesystems for fstype detection.
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22 | mount_it_now() does the actual mount.
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23 | */
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24 |
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25 | #include "busybox.h"
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26 | #include <unistd.h>
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27 | #include <errno.h>
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28 | #include <string.h>
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29 | #include <mntent.h>
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30 | #include <ctype.h>
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31 | #include <fcntl.h> // for CONFIG_FEATURE_MOUNT_LOOP
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32 | #include <sys/ioctl.h> // for CONFIG_FEATURE_MOUNT_LOOP
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33 |
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34 | // These two aren't always defined in old headers
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35 | #ifndef MS_BIND
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36 | #define MS_BIND 4096
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37 | #endif
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38 | #ifndef MS_MOVE
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39 | #define MS_MOVE 8192
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40 | #endif
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41 | #ifndef MS_SILENT
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42 | #define MS_SILENT 32768
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43 | #endif
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44 |
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45 | // Not real flags, but we want to be able to check for this.
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46 | #define MOUNT_NOAUTO (1<<29)
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47 | #define MOUNT_SWAP (1<<30)
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48 | /* Standard mount options (from -o options or --options), with corresponding
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49 | * flags */
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50 |
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51 | struct {
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52 | const char *name;
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53 | long flags;
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54 | } static const mount_options[] = {
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55 | // NOP flags.
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56 |
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57 | {"loop", 0},
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58 | {"defaults", 0},
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59 | {"quiet", 0},
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60 |
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61 | // vfs flags
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62 |
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63 | {"ro", MS_RDONLY},
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64 | {"rw", ~MS_RDONLY},
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65 | {"nosuid", MS_NOSUID},
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66 | {"suid", ~MS_NOSUID},
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67 | {"dev", ~MS_NODEV},
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68 | {"nodev", MS_NODEV},
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69 | {"exec", ~MS_NOEXEC},
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70 | {"noexec", MS_NOEXEC},
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71 | {"sync", MS_SYNCHRONOUS},
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72 | {"async", ~MS_SYNCHRONOUS},
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73 | {"atime", ~MS_NOATIME},
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74 | {"noatime", MS_NOATIME},
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75 | {"diratime", ~MS_NODIRATIME},
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76 | {"nodiratime", MS_NODIRATIME},
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77 | {"loud", ~MS_SILENT},
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78 |
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79 | // action flags
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80 |
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81 | {"remount", MS_REMOUNT},
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82 | {"bind", MS_BIND},
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83 | {"move", MS_MOVE},
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84 | {"noauto",MOUNT_NOAUTO},
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85 | {"swap",MOUNT_SWAP}
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86 | };
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87 |
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88 | /* Append mount options to string */
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89 | static void append_mount_options(char **oldopts, char *newopts)
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90 | {
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91 | if(*oldopts && **oldopts) {
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92 | char *temp=bb_xasprintf("%s,%s",*oldopts,newopts);
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93 | free(*oldopts);
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94 | *oldopts=temp;
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95 | } else {
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96 | if (ENABLE_FEATURE_CLEAN_UP) free(*oldopts);
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97 | *oldopts = bb_xstrdup(newopts);
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98 | }
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99 | }
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100 |
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101 | /* Use the mount_options list to parse options into flags.
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102 | * Return list of unrecognized options in *strflags if strflags!=NULL */
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103 | static int parse_mount_options(char *options, char **unrecognized)
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104 | {
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105 | int flags = MS_SILENT;
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106 |
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107 | // Loop through options
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108 | for (;;) {
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109 | int i;
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110 | char *comma = strchr(options, ',');
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111 |
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112 | if (comma) *comma = 0;
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113 |
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114 | // Find this option in mount_options
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115 | for (i = 0; i < (sizeof(mount_options) / sizeof(*mount_options)); i++) {
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116 | if (!strcasecmp(mount_options[i].name, options)) {
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117 | long fl = mount_options[i].flags;
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118 | if(fl < 0) flags &= fl;
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119 | else flags |= fl;
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120 | break;
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121 | }
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122 | }
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123 | // If unrecognized not NULL, append unrecognized mount options */
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124 | if (unrecognized
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125 | && i == (sizeof(mount_options) / sizeof(*mount_options)))
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126 | {
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127 | // Add it to strflags, to pass on to kernel
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128 | i = *unrecognized ? strlen(*unrecognized) : 0;
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129 | *unrecognized = xrealloc(*unrecognized, i+strlen(options)+2);
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130 |
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131 | // Comma separated if it's not the first one
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132 | if (i) (*unrecognized)[i++] = ',';
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133 | strcpy((*unrecognized)+i, options);
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134 | }
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135 |
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136 | // Advance to next option, or finish
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137 | if(comma) {
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138 | *comma = ',';
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139 | options = ++comma;
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140 | } else break;
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141 | }
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142 |
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143 | return flags;
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144 | }
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145 |
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146 | // Return a list of all block device backed filesystems
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147 |
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148 | static llist_t *get_block_backed_filesystems(void)
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149 | {
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150 | char *fs, *buf,
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151 | *filesystems[] = {"/etc/filesystems", "/proc/filesystems", 0};
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152 | llist_t *list = 0;
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153 | int i;
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154 | FILE *f;
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155 |
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156 | for(i = 0; filesystems[i]; i++) {
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157 | if(!(f = fopen(filesystems[i], "r"))) continue;
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158 |
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159 | for(fs = buf = 0; (fs = buf = bb_get_chomped_line_from_file(f));
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160 | free(buf))
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161 | {
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162 | if(!strncmp(buf,"nodev",5) && isspace(buf[5])) continue;
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163 |
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164 | while(isspace(*fs)) fs++;
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165 | if(*fs=='#' || *fs=='*') continue;
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166 | if(!*fs) continue;
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167 |
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168 | llist_add_to_end(&list,bb_xstrdup(fs));
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169 | }
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170 | if (ENABLE_FEATURE_CLEAN_UP) fclose(f);
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171 | }
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172 |
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173 | return list;
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174 | }
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175 |
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176 | llist_t *fslist = 0;
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177 |
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178 | #if ENABLE_FEATURE_CLEAN_UP
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179 | static void delete_block_backed_filesystems(void)
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180 | {
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181 | llist_free(fslist, free);
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182 | }
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183 | #else
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184 | void delete_block_backed_filesystems(void);
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185 | #endif
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186 |
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187 | #if ENABLE_FEATURE_MTAB_SUPPORT
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188 | static int useMtab;
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189 | static int fakeIt;
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190 | #else
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191 | #define useMtab 0
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192 | #define fakeIt 0
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193 | #endif
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194 |
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195 | // Perform actual mount of specific filesystem at specific location.
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196 |
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197 | static int mount_it_now(struct mntent *mp, int vfsflags, char *filteropts)
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198 | {
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199 | int rc;
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200 |
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201 | if (fakeIt) { return 0; }
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202 |
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203 | // Mount, with fallback to read-only if necessary.
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204 |
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205 | for(;;) {
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206 | rc = mount(mp->mnt_fsname, mp->mnt_dir, mp->mnt_type,
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207 | vfsflags, filteropts);
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208 | if(!rc || (vfsflags&MS_RDONLY) || (errno!=EACCES && errno!=EROFS))
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209 | break;
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210 | bb_error_msg("%s is write-protected, mounting read-only",
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211 | mp->mnt_fsname);
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212 | vfsflags |= MS_RDONLY;
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213 | }
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214 |
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215 | // Abort entirely if permission denied.
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216 |
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217 | if (rc && errno == EPERM)
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218 | bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
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219 |
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220 | /* If the mount was successful, and we're maintaining an old-style
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221 | * mtab file by hand, add the new entry to it now. */
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222 |
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223 | if(ENABLE_FEATURE_MTAB_SUPPORT && useMtab && !rc) {
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224 | FILE *mountTable = setmntent(bb_path_mtab_file, "a+");
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225 | int i;
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226 |
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227 | if(!mountTable)
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228 | bb_error_msg("No %s\n",bb_path_mtab_file);
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229 |
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230 | // Add vfs string flags
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231 |
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232 | for(i=0; mount_options[i].flags != MS_REMOUNT; i++)
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233 | if (mount_options[i].flags > 0)
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234 | append_mount_options(&(mp->mnt_opts),
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235 | // Shut up about the darn const. It's not important. I don't care.
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236 | (char *)mount_options[i].name);
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237 |
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238 | // Remove trailing / (if any) from directory we mounted on
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239 |
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240 | i = strlen(mp->mnt_dir);
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241 | if(i>1 && mp->mnt_dir[i-1] == '/') mp->mnt_dir[i-1] = 0;
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242 |
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243 | // Write and close.
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244 |
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245 | if(!mp->mnt_type || !*mp->mnt_type) mp->mnt_type="--bind";
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246 | addmntent(mountTable, mp);
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247 | endmntent(mountTable);
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248 | if (ENABLE_FEATURE_CLEAN_UP)
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249 | if(strcmp(mp->mnt_type,"--bind")) mp->mnt_type = 0;
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250 | }
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251 |
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252 | return rc;
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253 | }
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254 |
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255 |
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256 | // Mount one directory. Handles NFS, loopback, autobind, and filesystem type
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257 | // detection. Returns 0 for success, nonzero for failure.
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258 |
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259 | static int singlemount(struct mntent *mp, int ignore_busy)
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260 | {
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261 | int rc = -1, vfsflags;
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262 | char *loopFile = 0, *filteropts = 0;
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263 | llist_t *fl = 0;
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264 | struct stat st;
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265 |
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266 | vfsflags = parse_mount_options(mp->mnt_opts, &filteropts);
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267 |
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268 | // Treat fstype "auto" as unspecified.
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269 |
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270 | if (mp->mnt_type && !strcmp(mp->mnt_type,"auto")) mp->mnt_type = 0;
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271 |
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272 | // Might this be an NFS filesystem?
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273 |
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274 | if (ENABLE_FEATURE_MOUNT_NFS &&
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275 | (!mp->mnt_type || !strcmp(mp->mnt_type,"nfs")) &&
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276 | strchr(mp->mnt_fsname, ':') != NULL)
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277 | {
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278 | if (nfsmount(mp->mnt_fsname, mp->mnt_dir, &vfsflags, &filteropts, 1)) {
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279 | bb_perror_msg("nfsmount failed");
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280 | goto report_error;
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281 | } else {
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282 | // Strangely enough, nfsmount() doesn't actually mount() anything.
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283 | mp->mnt_type = "nfs";
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284 | rc = mount_it_now(mp, vfsflags, filteropts);
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285 | if (ENABLE_FEATURE_CLEAN_UP) free(filteropts);
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286 |
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287 | goto report_error;
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288 | }
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289 | }
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290 |
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291 | // Look at the file. (Not found isn't a failure for remount, or for
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292 | // a synthetic filesystem like proc or sysfs.)
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293 |
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294 | if (stat(mp->mnt_fsname, &st));
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295 | else if (!(vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE))) {
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296 | // Do we need to allocate a loopback device for it?
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297 |
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298 | if (ENABLE_FEATURE_MOUNT_LOOP && S_ISREG(st.st_mode)) {
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299 | loopFile = bb_simplify_path(mp->mnt_fsname);
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300 | mp->mnt_fsname = 0;
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301 | switch(set_loop(&(mp->mnt_fsname), loopFile, 0)) {
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302 | case 0:
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303 | case 1:
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304 | break;
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305 | default:
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306 | bb_error_msg( errno == EPERM || errno == EACCES
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307 | ? bb_msg_perm_denied_are_you_root
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308 | : "Couldn't setup loop device");
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309 | return errno;
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310 | }
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311 |
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312 | // Autodetect bind mounts
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313 |
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314 | } else if (S_ISDIR(st.st_mode) && !mp->mnt_type) vfsflags |= MS_BIND;
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315 | }
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316 |
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317 | /* If we know the fstype (or don't need to), jump straight
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318 | * to the actual mount. */
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319 |
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320 | if (mp->mnt_type || (vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE)))
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321 | rc = mount_it_now(mp, vfsflags, filteropts);
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322 |
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323 | // Loop through filesystem types until mount succeeds or we run out
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324 |
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325 | else {
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326 |
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327 | /* Initialize list of block backed filesystems. This has to be
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328 | * done here so that during "mount -a", mounts after /proc shows up
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329 | * can autodetect. */
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330 |
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331 | if (!fslist) {
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332 | fslist = get_block_backed_filesystems();
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333 | if (ENABLE_FEATURE_CLEAN_UP && fslist)
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334 | atexit(delete_block_backed_filesystems);
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335 | }
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336 |
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337 | for (fl = fslist; fl; fl = fl->link) {
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338 | mp->mnt_type = fl->data;
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339 |
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340 | if (!(rc = mount_it_now(mp,vfsflags, filteropts))) break;
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341 |
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342 | mp->mnt_type = 0;
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343 | }
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344 | }
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345 |
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346 | if (ENABLE_FEATURE_CLEAN_UP) free(filteropts);
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347 |
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348 | // If mount failed, clean up loop file (if any).
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349 |
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350 | if (ENABLE_FEATURE_MOUNT_LOOP && rc && loopFile) {
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351 | del_loop(mp->mnt_fsname);
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352 | if (ENABLE_FEATURE_CLEAN_UP) {
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353 | free(loopFile);
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354 | free(mp->mnt_fsname);
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355 | }
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356 | }
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357 | report_error:
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358 | if (rc && errno == EBUSY && ignore_busy) rc = 0;
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359 | if (rc < 0)
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360 | bb_perror_msg("Mounting %s on %s failed", mp->mnt_fsname, mp->mnt_dir);
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361 |
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362 | return rc;
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363 | }
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364 |
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365 | // Parse options, if necessary parse fstab/mtab, and call singlemount for
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366 | // each directory to be mounted.
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367 |
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368 | int mount_main(int argc, char **argv)
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369 | {
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370 | char *cmdopts = bb_xstrdup(""), *fstabname, *fstype=0, *storage_path=0;
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371 | FILE *fstab;
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372 | int i, opt, all = FALSE, rc = 0;
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373 | struct mntent mtpair[2], *mtcur = mtpair;
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374 |
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375 | /* parse long options, like --bind and --move. Note that -o option
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376 | * and --option are synonymous. Yes, this means --remount,rw works. */
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377 |
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378 | for (i = opt = 0; i < argc; i++) {
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379 | if (argv[i][0] == '-' && argv[i][1] == '-') {
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380 | append_mount_options(&cmdopts,argv[i]+2);
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381 | } else argv[opt++] = argv[i];
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382 | }
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383 | argc = opt;
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384 |
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385 | // Parse remaining options
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386 |
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387 | while ((opt = getopt(argc, argv, "o:t:rwavnf")) > 0) {
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388 | switch (opt) {
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389 | case 'o':
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390 | append_mount_options(&cmdopts, optarg);
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391 | break;
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392 | case 't':
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393 | fstype = optarg;
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394 | break;
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395 | case 'r':
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396 | append_mount_options(&cmdopts, "ro");
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397 | break;
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398 | case 'w':
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399 | append_mount_options(&cmdopts, "rw");
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400 | break;
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401 | case 'a':
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402 | all = TRUE;
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403 | break;
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404 | case 'n':
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405 | USE_FEATURE_MTAB_SUPPORT(useMtab = FALSE;)
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406 | break;
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407 | case 'f':
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408 | USE_FEATURE_MTAB_SUPPORT(fakeIt = FALSE;)
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409 | break;
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410 | case 'v':
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411 | break; // ignore -v
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412 | default:
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413 | bb_show_usage();
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414 | }
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415 | }
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416 |
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417 | // Three or more non-option arguments? Die with a usage message.
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418 |
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419 | if (optind-argc>2) bb_show_usage();
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420 |
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421 | // If we have no arguments, show currently mounted filesystems
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422 |
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423 | if (optind == argc) {
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424 | if (!all) {
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425 | FILE *mountTable = setmntent(bb_path_mtab_file, "r");
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426 |
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427 | if(!mountTable) bb_error_msg_and_die("No %s",bb_path_mtab_file);
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428 |
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429 | while (getmntent_r(mountTable,mtpair,bb_common_bufsiz1,
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430 | sizeof(bb_common_bufsiz1)))
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431 | {
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432 | // Don't show rootfs.
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433 | if (!strcmp(mtpair->mnt_fsname, "rootfs")) continue;
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434 |
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435 | if (!fstype || !strcmp(mtpair->mnt_type, fstype))
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436 | printf("%s on %s type %s (%s)\n", mtpair->mnt_fsname,
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437 | mtpair->mnt_dir, mtpair->mnt_type,
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438 | mtpair->mnt_opts);
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439 | }
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440 | if (ENABLE_FEATURE_CLEAN_UP) endmntent(mountTable);
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441 | return EXIT_SUCCESS;
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442 | }
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443 | }
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444 |
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445 | // When we have two arguments, the second is the directory and we can
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446 | // skip looking at fstab entirely. We can always abspath() the directory
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447 | // argument when we get it.
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448 |
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449 | if (optind+2 == argc) {
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450 | mtpair->mnt_fsname = argv[optind];
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451 | mtpair->mnt_dir = argv[optind+1];
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452 | mtpair->mnt_type = fstype;
|
---|
453 | mtpair->mnt_opts = cmdopts;
|
---|
454 | rc = singlemount(mtpair, 0);
|
---|
455 | goto clean_up;
|
---|
456 | }
|
---|
457 |
|
---|
458 | // If we have at least one argument, it's the storage location
|
---|
459 |
|
---|
460 | if (optind < argc) storage_path = bb_simplify_path(argv[optind]);
|
---|
461 |
|
---|
462 | // Open either fstab or mtab
|
---|
463 |
|
---|
464 | if (parse_mount_options(cmdopts,0) & MS_REMOUNT)
|
---|
465 | fstabname = (char *)bb_path_mtab_file; // Again with the evil const.
|
---|
466 | else fstabname="/etc/fstab";
|
---|
467 |
|
---|
468 | if (!(fstab=setmntent(fstabname,"r")))
|
---|
469 | bb_perror_msg_and_die("Cannot read %s",fstabname);
|
---|
470 |
|
---|
471 | // Loop through entries until we find what we're looking for.
|
---|
472 |
|
---|
473 | memset(mtpair,0,sizeof(mtpair));
|
---|
474 | for (;;) {
|
---|
475 | struct mntent *mtnext = mtpair + (mtcur==mtpair ? 1 : 0);
|
---|
476 |
|
---|
477 | // Get next fstab entry
|
---|
478 |
|
---|
479 | if (!getmntent_r(fstab, mtcur, bb_common_bufsiz1
|
---|
480 | + (mtcur==mtpair ? sizeof(bb_common_bufsiz1)/2 : 0),
|
---|
481 | sizeof(bb_common_bufsiz1)/2))
|
---|
482 | {
|
---|
483 | // Were we looking for something specific?
|
---|
484 |
|
---|
485 | if (optind != argc) {
|
---|
486 |
|
---|
487 | // If we didn't find anything, complain.
|
---|
488 |
|
---|
489 | if (!mtnext->mnt_fsname)
|
---|
490 | bb_error_msg_and_die("Can't find %s in %s",
|
---|
491 | argv[optind], fstabname);
|
---|
492 |
|
---|
493 | // Mount the last thing we found.
|
---|
494 |
|
---|
495 | mtcur = mtnext;
|
---|
496 | mtcur->mnt_opts=bb_xstrdup(mtcur->mnt_opts);
|
---|
497 | append_mount_options(&(mtcur->mnt_opts),cmdopts);
|
---|
498 | rc = singlemount(mtcur, 0);
|
---|
499 | free(mtcur->mnt_opts);
|
---|
500 | }
|
---|
501 | goto clean_up;
|
---|
502 | }
|
---|
503 |
|
---|
504 | /* If we're trying to mount something specific and this isn't it,
|
---|
505 | * skip it. Note we must match both the exact text in fstab (ala
|
---|
506 | * "proc") or a full path from root */
|
---|
507 |
|
---|
508 | if (optind != argc) {
|
---|
509 |
|
---|
510 | // Is this what we're looking for?
|
---|
511 |
|
---|
512 | if(strcmp(argv[optind],mtcur->mnt_fsname) &&
|
---|
513 | strcmp(storage_path,mtcur->mnt_fsname) &&
|
---|
514 | strcmp(argv[optind],mtcur->mnt_dir) &&
|
---|
515 | strcmp(storage_path,mtcur->mnt_dir)) continue;
|
---|
516 |
|
---|
517 | // Remember this entry. Something later may have overmounted
|
---|
518 | // it, and we want the _last_ match.
|
---|
519 |
|
---|
520 | mtcur = mtnext;
|
---|
521 |
|
---|
522 | // If we're mounting all.
|
---|
523 |
|
---|
524 | } else {
|
---|
525 |
|
---|
526 | // Do we need to match a filesystem type?
|
---|
527 | if (fstype && strcmp(mtcur->mnt_type,fstype)) continue;
|
---|
528 |
|
---|
529 | // Skip noauto and swap anyway.
|
---|
530 |
|
---|
531 | if (parse_mount_options(mtcur->mnt_opts,0)
|
---|
532 | & (MOUNT_NOAUTO | MOUNT_SWAP)) continue;
|
---|
533 |
|
---|
534 | // Mount this thing.
|
---|
535 |
|
---|
536 | if (singlemount(mtcur, 1)) {
|
---|
537 | /* Count number of failed mounts */
|
---|
538 | rc++;
|
---|
539 | }
|
---|
540 | }
|
---|
541 | }
|
---|
542 | if (ENABLE_FEATURE_CLEAN_UP) endmntent(fstab);
|
---|
543 |
|
---|
544 | clean_up:
|
---|
545 |
|
---|
546 | if (ENABLE_FEATURE_CLEAN_UP) {
|
---|
547 | free(storage_path);
|
---|
548 | free(cmdopts);
|
---|
549 | }
|
---|
550 |
|
---|
551 | return rc;
|
---|
552 | }
|
---|