1 | /** @file
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2 | * vboxsf -- VirtualBox Guest Additions for Linux: mount(8) helper
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3 | *
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4 | * Parses options provided by mount (or user directly)
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5 | * Packs them into struct vbsfmount and passes to mount(2)
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6 | * Optionally adds entries to mtab
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7 | */
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8 |
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9 | /*
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10 | * Copyright (C) 2006-2010 Oracle Corporation
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11 | *
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12 | * This file is part of VirtualBox Open Source Edition (OSE), as
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13 | * available from http://www.virtualbox.org. This file is free software;
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14 | * you can redistribute it and/or modify it under the terms of the GNU
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15 | * General Public License (GPL) as published by the Free Software
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16 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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17 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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18 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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19 | */
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20 |
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21 |
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22 | #ifndef _GNU_SOURCE
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23 | #define _GNU_SOURCE
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24 | #endif
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25 |
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26 | /* #define DEBUG */
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27 | #define DBG if (0)
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28 | #include <errno.h>
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29 | #include <fcntl.h>
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30 | #include <ctype.h>
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31 | #include <getopt.h>
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32 | #include <mntent.h>
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33 | #include <pwd.h>
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34 | #include <stdarg.h>
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35 | #include <stdio.h>
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36 | #include <stdlib.h>
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37 | #include <string.h>
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38 | #include <sys/mount.h>
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39 | #include <sys/stat.h>
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40 | #include <sys/types.h>
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41 | #include <unistd.h>
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42 | #include <mntent.h>
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43 | #include <limits.h>
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44 | #include <iconv.h>
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45 |
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46 | #include "vbsfmount.h"
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47 |
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48 | /* Compile-time assertion. If a == 0, we get two identical switch cases, which is not
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49 | allowed. */
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50 | #define CT_ASSERT(a) \
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51 | do { \
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52 | switch(0) { case 0: case (a): ; } \
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53 | } while (0)
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54 |
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55 | #define PANIC_ATTR __attribute ((noreturn, __format__ (__printf__, 1, 2)))
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56 |
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57 | static void PANIC_ATTR
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58 | panic(const char *fmt, ...)
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59 | {
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60 | va_list ap;
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61 |
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62 | va_start(ap, fmt);
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63 | vfprintf(stderr, fmt, ap);
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64 | va_end(ap);
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65 | exit(EXIT_FAILURE);
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66 | }
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67 |
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68 | static void PANIC_ATTR
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69 | panic_err(const char *fmt, ...)
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70 | {
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71 | va_list ap;
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72 | int errno_code = errno;
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73 |
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74 | va_start(ap, fmt);
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75 | vfprintf(stderr, fmt, ap);
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76 | va_end(ap);
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77 | fprintf(stderr, ": %s\n", strerror(errno_code));
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78 | exit(EXIT_FAILURE);
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79 | }
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80 |
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81 | static int
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82 | safe_atoi(const char *s, size_t size, int base)
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83 | {
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84 | char *endptr;
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85 | long long int val = strtoll(s, &endptr, base);
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86 |
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87 | if (val < INT_MIN || val > INT_MAX || endptr < s + size)
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88 | {
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89 | errno = ERANGE;
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90 | panic_err("could not convert %.*s to integer, result = %d",
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91 | (int)size, s, (int) val);
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92 | }
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93 | return (int)val;
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94 | }
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95 |
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96 | static void
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97 | process_mount_opts(const char *s, struct vbsf_mount_opts *opts)
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98 | {
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99 | const char *next = s;
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100 | size_t len;
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101 | typedef enum handler_opt
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102 | {
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103 | HORW,
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104 | HORO,
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105 | HOUID,
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106 | HOGID,
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107 | HOTTL,
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108 | HODMODE,
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109 | HOFMODE,
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110 | HOUMASK,
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111 | HODMASK,
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112 | HOFMASK,
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113 | HOIOCHARSET,
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114 | HOCONVERTCP,
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115 | HONOEXEC,
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116 | HOEXEC,
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117 | HONODEV,
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118 | HODEV,
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119 | HONOSUID,
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120 | HOSUID,
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121 | HOREMOUNT,
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122 | HONOAUTO,
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123 | HONIGNORE
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124 | } handler_opt;
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125 | struct
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126 | {
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127 | const char *name;
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128 | handler_opt opt;
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129 | int has_arg;
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130 | const char *desc;
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131 | } handlers[]
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132 | =
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133 | {
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134 | {"rw", HORW, 0, "mount read write (default)"},
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135 | {"ro", HORO, 0, "mount read only"},
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136 | {"uid", HOUID, 1, "default file owner user id"},
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137 | {"gid", HOGID, 1, "default file owner group id"},
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138 | {"ttl", HOTTL, 1, "time to live for dentry"},
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139 | {"iocharset", HOIOCHARSET, 1, "i/o charset (default utf8)"},
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140 | {"convertcp", HOCONVERTCP, 1, "convert share name from given charset to utf8"},
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141 | {"dmode", HODMODE, 1, "mode of all directories"},
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142 | {"fmode", HOFMODE, 1, "mode of all regular files"},
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143 | {"umask", HOUMASK, 1, "umask of directories and regular files"},
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144 | {"dmask", HODMASK, 1, "umask of directories"},
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145 | {"fmask", HOFMASK, 1, "umask of regular files"},
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146 | {"noexec", HONOEXEC, 0, 0 }, /* don't document these options directly here */
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147 | {"exec", HOEXEC, 0, 0 }, /* as they are well known and described in the */
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148 | {"nodev", HONODEV, 0, 0 }, /* usual manpages */
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149 | {"dev", HODEV, 0, 0 },
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150 | {"nosuid", HONOSUID, 0, 0 },
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151 | {"suid", HOSUID, 0, 0 },
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152 | {"remount", HOREMOUNT, 0, 0 },
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153 | {"noauto", HONOAUTO, 0, 0 },
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154 | {"_netdev", HONIGNORE, 0, 0 },
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155 | {NULL, 0, 0, NULL}
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156 | }, *handler;
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157 |
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158 | while (next)
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159 | {
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160 | const char *val;
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161 | size_t key_len, val_len;
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162 |
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163 | s = next;
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164 | next = strchr(s, ',');
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165 | if (!next)
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166 | {
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167 | len = strlen(s);
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168 | }
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169 | else
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170 | {
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171 | len = next - s;
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172 | next += 1;
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173 | if (!*next)
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174 | next = 0;
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175 | }
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176 |
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177 | val = NULL;
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178 | val_len = 0;
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179 | for (key_len = 0; key_len < len; ++key_len)
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180 | {
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181 | if (s[key_len] == '=')
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182 | {
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183 | if (key_len + 1 < len)
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184 | {
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185 | val = s + key_len + 1;
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186 | val_len = len - key_len - 1;
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187 | }
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188 | break;
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189 | }
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190 | }
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191 |
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192 | for (handler = handlers; handler->name; ++handler)
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193 | {
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194 | size_t j;
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195 | for (j = 0; j < key_len && handler->name[j] == s[j]; ++j)
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196 | ;
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197 |
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198 | if (j == key_len && !handler->name[j])
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199 | {
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200 | if (handler->has_arg)
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201 | {
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202 | if (!(val && *val))
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203 | {
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204 | panic("%.*s requires an argument (i.e. %.*s=<arg>)\n",
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205 | (int)len, s, (int)len, s);
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206 | }
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207 | }
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208 |
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209 | switch(handler->opt)
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210 | {
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211 | case HORW:
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212 | opts->ronly = 0;
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213 | break;
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214 | case HORO:
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215 | opts->ronly = 1;
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216 | break;
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217 | case HONOEXEC:
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218 | opts->noexec = 1;
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219 | break;
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220 | case HOEXEC:
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221 | opts->noexec = 0;
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222 | break;
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223 | case HONODEV:
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224 | opts->nodev = 1;
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225 | break;
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226 | case HODEV:
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227 | opts->nodev = 0;
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228 | break;
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229 | case HONOSUID:
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230 | opts->nosuid = 1;
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231 | break;
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232 | case HOSUID:
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233 | opts->nosuid = 0;
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234 | break;
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235 | case HOREMOUNT:
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236 | opts->remount = 1;
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237 | break;
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238 | case HOUID:
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239 | /** @todo convert string to id. */
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240 | opts->uid = safe_atoi(val, val_len, 10);
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241 | break;
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242 | case HOGID:
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243 | /** @todo convert string to id. */
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244 | opts->gid = safe_atoi(val, val_len, 10);
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245 | break;
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246 | case HOTTL:
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247 | opts->ttl = safe_atoi(val, val_len, 10);
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248 | break;
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249 | case HODMODE:
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250 | opts->dmode = safe_atoi(val, val_len, 8);
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251 | break;
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252 | case HOFMODE:
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253 | opts->fmode = safe_atoi(val, val_len, 8);
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254 | break;
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255 | case HOUMASK:
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256 | opts->dmask = opts->fmask = safe_atoi(val, val_len, 8);
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257 | break;
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258 | case HODMASK:
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259 | opts->dmask = safe_atoi(val, val_len, 8);
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260 | break;
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261 | case HOFMASK:
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262 | opts->fmask = safe_atoi(val, val_len, 8);
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263 | break;
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264 | case HOIOCHARSET:
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265 | if (val_len + 1 > sizeof(opts->nls_name))
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266 | {
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267 | panic("iocharset name too long\n");
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268 | }
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269 | memcpy(opts->nls_name, val, val_len);
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270 | opts->nls_name[val_len] = 0;
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271 | break;
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272 | case HOCONVERTCP:
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273 | opts->convertcp = malloc(val_len + 1);
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274 | if (!opts->convertcp)
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275 | {
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276 | panic_err("could not allocate memory");
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277 | }
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278 | memcpy(opts->convertcp, val, val_len);
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279 | opts->convertcp[val_len] = 0;
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280 | break;
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281 | case HONOAUTO:
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282 | case HONIGNORE:
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283 | break;
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284 | }
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285 | break;
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286 | }
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287 | continue;
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288 | }
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289 |
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290 | if (!handler->name)
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291 | {
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292 | fprintf(stderr, "unknown mount option `%.*s'\n", (int)len, s);
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293 | fprintf(stderr, "valid options:\n");
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294 |
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295 | for (handler = handlers; handler->name; ++handler)
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296 | {
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297 | if (handler->desc)
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298 | fprintf(stderr, " %-10s%s %s\n", handler->name,
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299 | handler->has_arg ? "=<arg>" : "", handler->desc);
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300 | }
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301 | exit(EXIT_FAILURE);
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302 | }
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303 | }
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304 | }
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305 |
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306 | static void
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307 | convertcp(char *in_codeset, char *host_name, struct vbsf_mount_info_new *info)
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308 | {
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309 | char *i = host_name;
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310 | char *o = info->name;
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311 | size_t ib = strlen(host_name);
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312 | size_t ob = sizeof(info->name) - 1;
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313 | iconv_t cd;
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314 |
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315 | cd = iconv_open("UTF-8", in_codeset);
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316 | if (cd == (iconv_t) -1)
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317 | {
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318 | panic_err("could not convert share name, iconv_open `%s' failed",
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319 | in_codeset);
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320 | }
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321 |
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322 | while (ib)
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323 | {
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324 | size_t c = iconv(cd, &i, &ib, &o, &ob);
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325 | if (c == (size_t) -1)
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326 | {
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327 | panic_err("could not convert share name(%s) at %d",
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328 | host_name, (int)(strlen (host_name) - ib));
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329 | }
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330 | }
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331 | *o = 0;
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332 | }
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333 |
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334 |
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335 | /**
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336 | * Print out a usage message and exit.
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337 | *
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338 | * @param name The name of the application
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339 | */
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340 | static void __attribute ((noreturn)) usage(char *name)
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341 | {
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342 | printf("Usage: %s [OPTIONS] NAME MOUNTPOINT\n"
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343 | "Mount the VirtualBox shared folder NAME from the host system to MOUNTPOINT.\n"
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344 | "\n"
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345 | " -w mount the shared folder writably (the default)\n"
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346 | " -r mount the shared folder read-only\n"
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347 | " -n do not create an mtab entry\n"
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348 | " -o OPTION[,OPTION...] use the mount options specified\n"
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349 | "\n", name);
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350 | printf("Available mount options are:\n"
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351 | " rw mount writably (the default)\n"
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352 | " ro mount read only\n"
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353 | " uid=UID set the default file owner user id to UID\n"
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354 | " gid=GID set the default file owner group id to GID\n"
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355 | " ttl=TTL set the \"time to live\" to TID for the dentry\n");
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356 | printf(" dmode=MODE override the mode of all directories to (octal) MODE\n"
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357 | " fmode=MODE override the mode of all regular files to (octal) MODE\n"
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358 | " umask=UMASK set the umask to (octal) UMASK\n");
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359 | printf(" dmask=UMASK set the umask applied to directories only\n"
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360 | " fmask=UMASK set the umask applied to regular files only\n"
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361 | " iocharset CHARSET use the character set CHARSET for I/O operations\n"
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362 | " (default set is utf8)\n"
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363 | " convertcp CHARSET convert the folder name from CHARSET to utf8\n"
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364 | "\n");
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365 | printf("Less common used options:\n"
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366 | " noexec,exec,nodev,dev,nosuid,suid\n");
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367 | exit(1);
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368 | }
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369 |
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370 | int
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371 | main (int argc, char **argv)
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372 | {
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373 | int c;
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374 | int err;
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375 | int nomtab = 0;
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376 | unsigned long flags = MS_NODEV;
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377 | char *host_name;
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378 | char *mount_point;
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379 | struct vbsf_mount_info_new mntinf;
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380 | struct vbsf_mount_opts opts =
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381 | {
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382 | 0, /* uid */
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383 | 0, /* gid */
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384 | 0, /* ttl */
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385 | ~0, /* dmode */
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386 | ~0, /* fmode*/
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387 | 0, /* dmask */
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388 | 0, /* fmask */
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389 | 0, /* ronly */
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390 | 0, /* noexec */
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391 | 0, /* nodev */
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392 | 0, /* nosuid */
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393 | 0, /* remount */
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394 | "\0", /* nls_name */
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395 | NULL, /* convertcp */
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396 | };
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397 |
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398 | mntinf.nullchar = '\0';
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399 | mntinf.signature[0] = VBSF_MOUNT_SIGNATURE_BYTE_0;
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400 | mntinf.signature[1] = VBSF_MOUNT_SIGNATURE_BYTE_1;
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401 | mntinf.signature[2] = VBSF_MOUNT_SIGNATURE_BYTE_2;
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402 | mntinf.length = sizeof(mntinf);
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403 |
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404 | if (getuid())
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405 | panic("Only root can mount shared folders from the host.\n");
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406 |
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407 | if (!argv[0])
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408 | argv[0] = "mount.vboxsf";
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409 |
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410 | /* Compile-time assertions */
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411 | CT_ASSERT(sizeof(uid_t) == sizeof(int));
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412 | CT_ASSERT(sizeof(gid_t) == sizeof(int));
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413 |
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414 | while ((c = getopt(argc, argv, "rwno:h")) != -1)
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415 | {
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416 | switch (c)
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417 | {
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418 | default:
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419 | fprintf(stderr, "unknown option `%c:%#x'\n", c, c);
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420 | case '?':
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421 | case 'h':
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422 | usage(argv[0]);
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423 |
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424 | case 'r':
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425 | opts.ronly = 1;
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426 | break;
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427 |
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428 | case 'w':
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429 | opts.ronly = 0;
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430 |
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431 | case 'o':
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432 | process_mount_opts(optarg, &opts);
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433 | break;
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434 |
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435 | case 'n':
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436 | nomtab = 1;
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437 | break;
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438 | }
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439 | }
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440 |
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441 | if (argc - optind < 2)
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442 | usage(argv[0]);
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443 |
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444 | host_name = argv[optind];
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445 | mount_point = argv[optind + 1];
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446 |
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447 | if (opts.convertcp)
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448 | convertcp(opts.convertcp, host_name, &mntinf);
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449 | else
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450 | {
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451 | if (strlen(host_name) > MAX_HOST_NAME - 1)
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452 | panic("host name is too big\n");
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453 |
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454 | strcpy(mntinf.name, host_name);
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455 | }
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456 |
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457 | if (strlen(opts.nls_name) > MAX_NLS_NAME - 1)
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458 | panic("%s: the character set name for I/O is too long.\n", argv[0]);
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459 |
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460 | strcpy(mntinf.nls_name, opts.nls_name);
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461 |
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462 | if (opts.ronly)
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463 | flags |= MS_RDONLY;
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464 | if (opts.noexec)
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465 | flags |= MS_NOEXEC;
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466 | if (opts.nodev)
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467 | flags |= MS_NODEV;
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468 |
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469 | mntinf.uid = opts.uid;
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470 | mntinf.gid = opts.gid;
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471 | mntinf.ttl = opts.ttl;
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472 | mntinf.dmode = opts.dmode;
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473 | mntinf.fmode = opts.fmode;
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474 | mntinf.dmask = opts.dmask;
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475 | mntinf.fmask = opts.fmask;
|
---|
476 |
|
---|
477 | /*
|
---|
478 | * Note: When adding and/or modifying parameters of the vboxsf mounting
|
---|
479 | * options you also would have to adjust VBoxServiceAutoMount.cpp
|
---|
480 | * to keep this code here slick without having VbglR3.
|
---|
481 | */
|
---|
482 | err = mount(NULL, mount_point, "vboxsf", flags, &mntinf);
|
---|
483 | if (err == -1 && errno == EPROTO)
|
---|
484 | {
|
---|
485 | /* Sometimes the mount utility messes up the share name. Try to
|
---|
486 | * un-mangle it again. */
|
---|
487 | char szCWD[4096];
|
---|
488 | size_t cchCWD;
|
---|
489 | if (!getcwd(szCWD, sizeof(szCWD)))
|
---|
490 | panic_err("%s: failed to get the current working directory", argv[0]);
|
---|
491 | cchCWD = strlen(szCWD);
|
---|
492 | if (!strncmp(host_name, szCWD, cchCWD))
|
---|
493 | {
|
---|
494 | while (host_name[cchCWD] == '/')
|
---|
495 | ++cchCWD;
|
---|
496 | /* We checked before that we have enough space */
|
---|
497 | strcpy(mntinf.name, host_name + cchCWD);
|
---|
498 | }
|
---|
499 | err = mount(NULL, mount_point, "vboxsf", flags, &mntinf);
|
---|
500 | }
|
---|
501 | if (err == -1 && errno == EPROTO)
|
---|
502 | {
|
---|
503 | /* New mount tool with old vboxsf module? Try again using the old
|
---|
504 | * vbsf_mount_info_old structure. */
|
---|
505 | struct vbsf_mount_info_old mntinf_old;
|
---|
506 | memcpy(&mntinf_old.name, &mntinf.name, MAX_HOST_NAME);
|
---|
507 | memcpy(&mntinf_old.nls_name, mntinf.nls_name, MAX_NLS_NAME);
|
---|
508 | mntinf_old.uid = mntinf.uid;
|
---|
509 | mntinf_old.gid = mntinf.gid;
|
---|
510 | mntinf_old.ttl = mntinf.ttl;
|
---|
511 | err = mount(NULL, mount_point, "vboxsf", flags, &mntinf_old);
|
---|
512 | }
|
---|
513 | if (err)
|
---|
514 | panic_err("%s: mounting failed with the error", argv[0]);
|
---|
515 |
|
---|
516 | if (!nomtab)
|
---|
517 | {
|
---|
518 | err = vbsfmount_complete(host_name, mount_point, flags, &opts);
|
---|
519 | switch (err)
|
---|
520 | {
|
---|
521 | case 0: /* Success. */
|
---|
522 | break;
|
---|
523 |
|
---|
524 | case 1:
|
---|
525 | panic_err("%s: Could not update mount table (failed to create memstream).", argv[0]);
|
---|
526 | break;
|
---|
527 |
|
---|
528 | case 2:
|
---|
529 | panic_err("%s: Could not open mount table for update.", argv[0]);
|
---|
530 | break;
|
---|
531 |
|
---|
532 | case 3:
|
---|
533 | panic_err("%s: Could not add an entry to the mount table.", argv[0]);
|
---|
534 | break;
|
---|
535 |
|
---|
536 | default:
|
---|
537 | panic_err("%s: Unknown error while completing mount operation: %d", argv[0], err);
|
---|
538 | break;
|
---|
539 | }
|
---|
540 | }
|
---|
541 |
|
---|
542 | exit(EXIT_SUCCESS);
|
---|
543 | }
|
---|