1 | /* |
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2 | ------------------------------------------------------------------------ |
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3 | |
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4 | Copyright Cybertec Pty Ltd, 2000 |
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5 | All rights reserved Cybertec Pty Ltd, 2000 |
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6 | |
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7 | COPYRIGHT (c) 1989-1998. |
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8 | On-Line Applications Research Corporation (OAR). |
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9 | |
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10 | The license and distribution terms for this file may be |
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11 | found in the file LICENSE in this distribution or at |
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12 | |
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13 | http://www.rtems.org/license/LICENSE. |
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14 | |
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15 | This software with is provided ``as is'' and with NO WARRANTY. |
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16 | |
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17 | ------------------------------------------------------------------------ |
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18 | |
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19 | Set of helpers when creating a root file system. The root filesystem |
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20 | in RTEMS is the In Memory Filesystem (IMFS). We could copy an exiting |
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21 | filesystem to here, how-ever a number of files can have target |
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22 | specific initialisation info which we need to write. |
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23 | |
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24 | */ |
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25 | |
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26 | #if HAVE_CONFIG_H |
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27 | #include "config.h" |
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28 | #endif |
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29 | |
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30 | #include <errno.h> |
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31 | #include <stdio.h> |
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32 | #include <string.h> |
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33 | #include <sys/stat.h> |
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34 | #include <sys/types.h> |
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35 | #include <fcntl.h> |
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36 | #include <unistd.h> |
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37 | #include <sys/socket.h> |
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38 | #include <netinet/in.h> |
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39 | |
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40 | #include <rtems/mkrootfs.h> |
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41 | #include <rtems/libio.h> |
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42 | #include <rtems/endian.h> |
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43 | |
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44 | /* |
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45 | * A table a list of names and their modes. |
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46 | */ |
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47 | |
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48 | typedef struct rtems_rootfs_dir_table |
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49 | { |
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50 | const char *name; |
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51 | mode_t mode; |
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52 | } rtems_rootfs_dir_table; |
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53 | |
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54 | /* |
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55 | * Table of directorys to make. |
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56 | */ |
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57 | |
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58 | static const rtems_rootfs_dir_table default_directories[] = |
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59 | { |
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60 | { "/bin", S_IFDIR | S_IRWXU | S_IXGRP | S_IRGRP | S_IROTH | S_IXOTH }, |
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61 | { "/etc", S_IFDIR | S_IRWXU | S_IXGRP | S_IRGRP | S_IROTH | S_IXOTH }, |
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62 | { "/dev", S_IFDIR | S_IRWXU | S_IXGRP | S_IRGRP | S_IROTH | S_IXOTH }, |
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63 | { "/usr/bin", S_IFDIR | S_IRWXU | S_IXGRP | S_IRGRP | S_IROTH | S_IXOTH } |
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64 | }; |
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65 | |
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66 | #define MKFILE_MODE (S_IRUSR | S_IWUSR | S_IWGRP | S_IRGRP | S_IROTH) |
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67 | #define MKDIR_MODE (S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH) |
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68 | |
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69 | /* |
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70 | * Create enough files to support the networking stack. |
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71 | * Points to a table of strings. |
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72 | */ |
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73 | |
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74 | int |
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75 | rtems_rootfs_file_append (const char *file, |
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76 | mode_t omode, |
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77 | const int line_cnt, |
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78 | const char **lines) |
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79 | { |
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80 | struct stat sb; |
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81 | int fd; |
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82 | int i; |
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83 | |
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84 | /* |
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85 | * See is a file exists. If it does not, create the |
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86 | * file and the path to the file. |
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87 | */ |
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88 | |
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89 | fd = -1; |
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90 | |
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91 | if (stat(file, &sb)) |
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92 | { |
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93 | if (errno == ENOENT) |
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94 | { |
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95 | /* |
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96 | * Get the path to the file if one exists and create the |
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97 | * path. If it exists nothing happens. |
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98 | */ |
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99 | |
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100 | size_t i = strlen (file); |
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101 | |
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102 | while (i) |
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103 | { |
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104 | if (file[i] == '/') |
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105 | { |
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106 | char path[128]; |
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107 | |
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108 | if (i >= sizeof path) |
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109 | { |
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110 | printf ("root fs, path too long `%s'\n", file); |
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111 | return -1; |
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112 | } |
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113 | |
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114 | strncpy (path, file, i); |
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115 | path[i] = '\0'; |
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116 | |
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117 | if (rtems_mkdir (path, MKDIR_MODE)) |
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118 | return -1; |
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119 | break; |
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120 | } |
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121 | i--; |
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122 | } |
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123 | |
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124 | if ((fd = open (file, O_CREAT | O_APPEND | O_WRONLY, omode)) < 0) |
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125 | { |
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126 | printf ("root fs, cannot create file `%s' : %s\n", |
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127 | file, strerror (errno)); |
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128 | return -1; |
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129 | } |
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130 | } |
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131 | } |
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132 | |
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133 | if (fd < 0) |
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134 | { |
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135 | if ((fd = open (file, O_APPEND | O_WRONLY)) < 0) |
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136 | { |
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137 | printf ("root fs, cannot open file `%s' : %s\n", |
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138 | file, strerror (errno)); |
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139 | return -1; |
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140 | } |
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141 | } |
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142 | |
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143 | for (i = 0; i < line_cnt; i++) |
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144 | { |
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145 | size_t len = strlen (lines[i]); |
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146 | |
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147 | if (len) |
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148 | { |
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149 | if (write (fd, lines[i], strlen (lines[i])) < 0) |
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150 | { |
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151 | close (fd); |
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152 | printf ("root fs, cannot write to `%s' : %s\n", |
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153 | file, strerror (errno)); |
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154 | return -1; |
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155 | } |
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156 | } |
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157 | } |
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158 | |
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159 | return close (fd); |
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160 | } |
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161 | |
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162 | /* |
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163 | * Write hosts record. |
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164 | */ |
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165 | |
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166 | int |
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167 | rtems_rootfs_append_host_rec (in_addr_t cip, |
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168 | const char *cname, |
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169 | const char *dname) |
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170 | { |
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171 | char buf[128]; |
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172 | char *bufp = buf; |
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173 | const char *bufl[1]; |
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174 | struct in_addr ip; |
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175 | |
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176 | ip.s_addr = cip; |
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177 | |
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178 | if (cname && strlen (cname)) |
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179 | { |
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180 | snprintf (bufp, sizeof (buf), "%s\t\t%s", inet_ntoa (ip), cname); |
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181 | bufp += strlen (buf); |
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182 | |
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183 | if (dname && strlen (dname)) |
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184 | { |
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185 | snprintf (bufp, sizeof (buf), "\t\t%s.%s", cname, dname); |
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186 | bufp += strlen (buf); |
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187 | } |
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188 | |
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189 | strcat (buf, "\n"); |
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190 | |
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191 | bufl[0] = buf; |
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192 | |
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193 | if (rtems_rootfs_file_append ("/etc/hosts", MKFILE_MODE, 1, bufl) < 0) |
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194 | return -1; |
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195 | } |
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196 | else |
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197 | { |
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198 | printf ("rootfs hosts rec append, no cname supplied\n"); |
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199 | return -1; |
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200 | } |
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201 | |
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202 | return 0; |
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203 | } |
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204 | |
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205 | /* |
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206 | * Create a root file system. |
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207 | */ |
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208 | |
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209 | int |
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210 | rtems_create_root_fs (void) |
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211 | { |
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212 | const char *lines[1]; |
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213 | size_t i; |
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214 | |
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215 | /* |
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216 | * Create the directories. |
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217 | */ |
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218 | |
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219 | for (i = 0; |
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220 | i < (sizeof (default_directories) / sizeof (rtems_rootfs_dir_table)); |
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221 | i++) |
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222 | if (rtems_mkdir (default_directories[i].name, |
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223 | default_directories[i].mode)) |
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224 | return -1; |
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225 | |
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226 | /* |
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227 | * The TCP/IP stack likes this one. If DNS does not work |
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228 | * use the host file. |
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229 | */ |
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230 | |
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231 | lines[0] = "hosts,bind\n"; |
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232 | |
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233 | if (rtems_rootfs_file_append ("/etc/host.conf", MKFILE_MODE, 1, lines)) |
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234 | return -1; |
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235 | |
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236 | /* |
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237 | * Create a `/etc/hosts' file. |
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238 | */ |
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239 | |
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240 | if (rtems_rootfs_append_host_rec (htonl (0x7f000001), "localhost", "localdomain")) |
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241 | return -1; |
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242 | |
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243 | return 0; |
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244 | } |
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