1 | /* |
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2 | ------------------------------------------------------------------------ |
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3 | $Id$ |
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4 | ------------------------------------------------------------------------ |
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5 | |
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6 | Copyright Cybertec Pty Ltd, 2000 |
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7 | All rights reserved Cybertec Pty Ltd, 2000 |
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8 | |
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9 | COPYRIGHT (c) 1989-1998. |
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10 | On-Line Applications Research Corporation (OAR). |
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11 | |
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12 | The license and distribution terms for this file may be |
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13 | found in the file LICENSE in this distribution or at |
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14 | |
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15 | http://www.OARcorp.com/rtems/license.html. |
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16 | |
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17 | This software with is provided ``as is'' and with NO WARRANTY. |
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18 | |
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19 | ------------------------------------------------------------------------ |
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20 | |
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21 | Set of helpers when creating a root file system. The root filesystem |
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22 | in RTEMS is the In Memory Filesystem (IMFS). We could copy an exiting |
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23 | filesystem to here, how-ever a number of files can have target |
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24 | specific initialisation info which we need to write. |
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25 | |
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26 | */ |
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27 | |
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28 | #include <errno.h> |
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29 | #include <stdio.h> |
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30 | #include <string.h> |
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31 | #include <sys/stat.h> |
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32 | #include <sys/types.h> |
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33 | #include <fcntl.h> |
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34 | #include <unistd.h> |
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35 | #include <sys/socket.h> |
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36 | #include <netinet/in.h> |
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37 | #include <arpa/inet.h> |
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38 | |
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39 | #include <rtems/mkrootfs.h> |
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40 | |
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41 | /* |
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42 | * A table a list of names and their modes. |
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43 | */ |
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44 | |
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45 | typedef struct rtems_rootfs_dir_table |
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46 | { |
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47 | const char *name; |
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48 | int mode; |
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49 | } rtems_rootfs_dir_table; |
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50 | |
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51 | /* |
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52 | * Table of directorys to make. |
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53 | */ |
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54 | |
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55 | static const rtems_rootfs_dir_table default_directories[] = |
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56 | { |
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57 | { "/bin", S_IFDIR | S_IRWXU | S_IXGRP | S_IRGRP | S_IROTH | S_IXOTH }, |
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58 | { "/etc", S_IFDIR | S_IRWXU | S_IXGRP | S_IRGRP | S_IROTH | S_IXOTH }, |
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59 | { "/dev", S_IFDIR | S_IRWXU | S_IXGRP | S_IRGRP | S_IROTH | S_IXOTH }, |
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60 | { "/usr/bin", S_IFDIR | S_IRWXU | S_IXGRP | S_IRGRP | S_IROTH | S_IXOTH } |
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61 | }; |
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62 | |
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63 | #define MKFILE_MODE (S_IRUSR | S_IWUSR | S_IWGRP | S_IRGRP | S_IROTH) |
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64 | #define MKDIR_MODE (S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH) |
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65 | |
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66 | /* |
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67 | * Build a path. Taken from the BSD `mkdir' command. |
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68 | */ |
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69 | |
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70 | int |
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71 | rtems_rootfs_mkdir (const char *path_orig, mode_t omode) |
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72 | { |
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73 | struct stat sb; |
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74 | mode_t numask, oumask; |
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75 | int first, last, retval; |
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76 | char path[128]; |
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77 | char *p = path; |
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78 | |
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79 | if (strlen (path_orig) >= sizeof path) |
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80 | { |
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81 | printf ("root fs: mkdir path too long `%s'\n", path); |
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82 | return -1; |
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83 | } |
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84 | |
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85 | strcpy (path, path_orig); |
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86 | oumask = 0; |
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87 | retval = 0; |
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88 | if (p[0] == '/') /* Skip leading '/'. */ |
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89 | ++p; |
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90 | for (first = 1, last = 0; !last ; ++p) |
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91 | { |
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92 | if (p[0] == '\0') |
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93 | last = 1; |
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94 | else if (p[0] != '/') |
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95 | continue; |
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96 | *p = '\0'; |
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97 | if (p[1] == '\0') |
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98 | last = 1; |
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99 | if (first) |
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100 | { |
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101 | /* |
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102 | * POSIX 1003.2: |
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103 | * For each dir operand that does not name an existing |
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104 | * directory, effects equivalent to those cased by the |
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105 | * following command shall occcur: |
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106 | * |
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107 | * mkdir -p -m $(umask -S),u+wx $(dirname dir) && |
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108 | * mkdir [-m mode] dir |
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109 | * |
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110 | * We change the user's umask and then restore it, |
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111 | * instead of doing chmod's. |
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112 | */ |
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113 | oumask = umask(0); |
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114 | numask = oumask & ~(S_IWUSR | S_IXUSR); |
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115 | umask(numask); |
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116 | first = 0; |
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117 | } |
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118 | if (last) |
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119 | umask(oumask); |
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120 | if (stat(path, &sb)) |
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121 | { |
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122 | if (errno != ENOENT) |
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123 | { |
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124 | printf ("root fs: error stat'ing path `%s', %s\n", |
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125 | path, strerror (errno)); |
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126 | retval = 1; |
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127 | break; |
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128 | } |
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129 | if (mkdir(path, last ? omode : S_IRWXU | S_IRWXG | S_IRWXO) < 0) |
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130 | { |
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131 | printf ("root fs: error building path `%s', %s\n", |
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132 | path, strerror (errno)); |
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133 | retval = 1; |
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134 | break; |
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135 | } |
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136 | } |
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137 | else if ((sb.st_mode & S_IFMT) != S_IFDIR) |
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138 | { |
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139 | if (last) |
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140 | errno = EEXIST; |
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141 | else |
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142 | errno = ENOTDIR; |
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143 | printf ("root fs: path `%s' contains a file, %s\n", |
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144 | path, strerror (errno)); |
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145 | retval = 1; |
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146 | break; |
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147 | } |
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148 | if (!last) |
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149 | *p = '/'; |
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150 | } |
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151 | if (!first && !last) |
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152 | umask(oumask); |
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153 | return retval; |
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154 | } |
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155 | |
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156 | /* |
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157 | * Create enough files to support the networking stack. |
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158 | * Points to a table of strings. |
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159 | */ |
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160 | |
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161 | int |
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162 | rtems_rootfs_file_append (const char *file, |
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163 | mode_t omode, |
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164 | const int line_cnt, |
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165 | const char **lines) |
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166 | { |
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167 | struct stat sb; |
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168 | int fd; |
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169 | int i; |
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170 | |
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171 | /* |
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172 | * See is a file exists. If it does not, create the |
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173 | * file and the path to the file. |
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174 | */ |
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175 | |
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176 | fd = -1; |
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177 | |
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178 | if (stat(file, &sb)) |
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179 | { |
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180 | if (errno == ENOENT) |
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181 | { |
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182 | /* |
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183 | * Get the path to the file if one exists and create the |
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184 | * path. If it exists nothing happens. |
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185 | */ |
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186 | |
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187 | int i = strlen (file); |
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188 | |
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189 | while (i) |
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190 | { |
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191 | if (file[i] == '/') |
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192 | { |
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193 | char path[128]; |
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194 | |
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195 | if (i >= sizeof path) |
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196 | { |
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197 | printf ("root fs, path too long `%s'\n", file); |
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198 | return -1; |
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199 | } |
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200 | |
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201 | strncpy (path, file, i); |
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202 | path[i] = '\0'; |
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203 | |
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204 | if (rtems_rootfs_mkdir (path, MKDIR_MODE)) |
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205 | return -1; |
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206 | break; |
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207 | } |
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208 | i--; |
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209 | } |
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210 | |
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211 | if ((fd = open (file, O_CREAT | O_APPEND | O_WRONLY, omode)) < 0) |
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212 | { |
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213 | printf ("root fs, cannot create file `%s' : %s\n", |
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214 | file, strerror (errno)); |
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215 | return -1; |
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216 | } |
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217 | } |
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218 | } |
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219 | |
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220 | if (fd < 0) |
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221 | { |
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222 | if ((fd = open (file, O_APPEND | O_WRONLY)) < 0) |
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223 | { |
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224 | printf ("root fs, cannot open file `%s' : %s\n", |
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225 | file, strerror (errno)); |
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226 | return -1; |
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227 | } |
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228 | } |
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229 | |
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230 | for (i = 0; i < line_cnt; i++) |
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231 | { |
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232 | int len = strlen (lines[i]); |
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233 | |
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234 | if (len) |
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235 | { |
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236 | if (write (fd, lines[i], strlen (lines[i])) < 0) |
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237 | { |
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238 | close (fd); |
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239 | printf ("root fs, cannot write to `%s' : %s\n", |
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240 | file, strerror (errno)); |
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241 | return -1; |
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242 | } |
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243 | } |
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244 | } |
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245 | |
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246 | return close (fd); |
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247 | } |
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248 | |
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249 | /* |
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250 | * Write hosts record. |
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251 | */ |
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252 | |
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253 | int |
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254 | rtems_rootfs_append_host_rec (unsigned long cip, |
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255 | const char *cname, |
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256 | const char *dname) |
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257 | { |
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258 | char buf[128]; |
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259 | char *bufp = buf; |
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260 | const char *bufl[1]; |
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261 | struct in_addr ip; |
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262 | |
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263 | ip.s_addr = cip; |
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264 | |
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265 | if (cname && strlen (cname)) |
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266 | { |
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267 | snprintf (bufp, sizeof (buf), "%s\t\t%s", inet_ntoa (ip), cname); |
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268 | bufp += strlen (buf); |
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269 | |
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270 | if (dname && strlen (dname)) |
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271 | { |
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272 | snprintf (bufp, sizeof (buf), "\t\t%s.%s", cname, dname); |
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273 | bufp += strlen (buf); |
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274 | } |
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275 | |
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276 | strcat (buf, "\n"); |
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277 | |
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278 | bufl[0] = buf; |
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279 | |
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280 | if (rtems_rootfs_file_append ("/etc/hosts", MKFILE_MODE, 1, bufl) < 0) |
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281 | return -1; |
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282 | } |
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283 | else |
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284 | { |
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285 | printf ("rootfs hosts rec append, no cname supplied\n"); |
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286 | return -1; |
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287 | } |
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288 | |
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289 | return 0; |
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290 | } |
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291 | |
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292 | /* |
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293 | * Create a root file system. |
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294 | */ |
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295 | |
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296 | int |
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297 | rtems_create_root_fs () |
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298 | { |
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299 | const char *lines[1]; |
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300 | int i; |
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301 | |
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302 | /* |
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303 | * Create the directories. |
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304 | */ |
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305 | |
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306 | for (i = 0; |
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307 | i < (sizeof (default_directories) / sizeof (rtems_rootfs_dir_table)); |
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308 | i++) |
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309 | if (rtems_rootfs_mkdir (default_directories[i].name, |
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310 | default_directories[i].mode)) |
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311 | return -1; |
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312 | |
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313 | /* |
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314 | * /etc/passwd, /etc/group |
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315 | * Maybe needed by some tools. |
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316 | */ |
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317 | |
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318 | lines[0] = "root::0:0:root:/root:/bin/sh\n"; |
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319 | |
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320 | if (rtems_rootfs_file_append ("/etc/passwd", MKFILE_MODE, 1, lines)) |
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321 | return -1; |
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322 | |
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323 | lines[0] = "root::0:root\n"; |
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324 | |
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325 | if (rtems_rootfs_file_append ("/etc/group", MKFILE_MODE, 1, lines)) |
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326 | return -1; |
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327 | |
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328 | /* |
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329 | * The TCP/IP stack likes this one. If DNS does not work |
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330 | * use the host file. |
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331 | */ |
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332 | |
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333 | lines[0] = "hosts,bind\n"; |
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334 | |
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335 | if (rtems_rootfs_file_append ("/etc/host.conf", MKFILE_MODE, 1, lines)) |
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336 | return -1; |
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337 | |
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338 | /* |
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339 | * Create a `/etc/hosts' file. |
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340 | */ |
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341 | |
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342 | if (rtems_rootfs_append_host_rec (0x7f000001, "localhost", "localdomain")) |
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343 | return -1; |
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344 | |
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345 | return 0; |
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346 | } |
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347 | |
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