[d34d2e69] | 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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[eacd092c] | 15 | http://www.rtems.com/license/LICENSE. |
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[d34d2e69] | 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 | * The TCP/IP stack likes this one. If DNS does not work |
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| 315 | * use the host file. |
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| 316 | */ |
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| 317 | |
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| 318 | lines[0] = "hosts,bind\n"; |
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| 319 | |
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| 320 | if (rtems_rootfs_file_append ("/etc/host.conf", MKFILE_MODE, 1, lines)) |
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| 321 | return -1; |
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| 322 | |
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| 323 | /* |
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| 324 | * Create a `/etc/hosts' file. |
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| 325 | */ |
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| 326 | |
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| 327 | if (rtems_rootfs_append_host_rec (0x7f000001, "localhost", "localdomain")) |
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| 328 | return -1; |
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| 329 | |
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| 330 | return 0; |
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| 331 | } |
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| 332 | |
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