| 1 | /* |
| 2 | * Copyright (C) 2004-2006 Kay Sievers <kay@vrfy.org> |
| 3 | * Copyright (C) 2006 Hannes Reinecke <hare@suse.de> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License as published by the |
| 7 | * Free Software Foundation version 2 of the License. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, but |
| 10 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | * General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License along |
| 15 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 17 | * |
| 18 | */ |
| 19 | |
| 20 | #include <stdlib.h> |
| 21 | #include <stddef.h> |
| 22 | #include <stdarg.h> |
| 23 | #include <string.h> |
| 24 | #include <stdio.h> |
| 25 | #include <unistd.h> |
| 26 | #include <getopt.h> |
| 27 | #include <errno.h> |
| 28 | #include <dirent.h> |
| 29 | #include <fcntl.h> |
| 30 | #include <syslog.h> |
| 31 | #include <sys/stat.h> |
| 32 | #include <sys/types.h> |
| 33 | |
| 34 | #define PATH_SIZE 512 |
| 35 | |
| 36 | static int verbose; |
| 37 | static int dry_run; |
| 38 | |
| 39 | void log_message(int priority, const char *format, ...) |
| 40 | { |
| 41 | va_list args; |
| 42 | |
| 43 | va_start(args, format); |
| 44 | vsyslog(priority, format, args); |
| 45 | va_end(args); |
| 46 | } |
| 47 | |
| 48 | #undef err |
| 49 | #define err(format, arg...) \ |
| 50 | do { \ |
| 51 | log_message(LOG_ERR ,"%s: " format ,__FUNCTION__ ,## arg); \ |
| 52 | } while (0) |
| 53 | |
| 54 | #undef info |
| 55 | #define info(format, arg...) \ |
| 56 | do { \ |
| 57 | log_message(LOG_INFO ,"%s: " format ,__FUNCTION__ ,## arg); \ |
| 58 | } while (0) |
| 59 | |
| 60 | #ifdef DEBUG |
| 61 | #undef dbg |
| 62 | #define dbg(format, arg...) \ |
| 63 | do { \ |
| 64 | log_message(LOG_DEBUG ,"%s: " format ,__FUNCTION__ ,## arg); \ |
| 65 | } while (0) |
| 66 | #else |
| 67 | #define dbg(...) do {} while(0) |
| 68 | #endif |
| 69 | |
| 70 | |
| 71 | static void trigger_uevent(const char *devpath) |
| 72 | { |
| 73 | char filename[PATH_SIZE]; |
| 74 | int fd; |
| 75 | |
| 76 | strlcpy(filename, "/sys", sizeof(filename)); |
| 77 | strlcat(filename, devpath, sizeof(filename)); |
| 78 | strlcat(filename, "/uevent", sizeof(filename)); |
| 79 | |
| 80 | if (verbose) |
| 81 | printf("%s\n", devpath); |
| 82 | |
| 83 | if (dry_run) |
| 84 | return; |
| 85 | |
| 86 | fd = open(filename, O_WRONLY); |
| 87 | if (fd < 0) { |
| 88 | dbg("error on opening %s: %s\n", filename, strerror(errno)); |
| 89 | return; |
| 90 | } |
| 91 | |
| 92 | if (write(fd, "add", 3) < 0) |
| 93 | info("error on triggering %s: %s\n", filename, strerror(errno)); |
| 94 | |
| 95 | close(fd); |
| 96 | } |
| 97 | |
| 98 | static int sysfs_resolve_link(char *devpath, size_t size) |
| 99 | { |
| 100 | char link_path[PATH_SIZE]; |
| 101 | char link_target[PATH_SIZE]; |
| 102 | int len; |
| 103 | int i; |
| 104 | int back; |
| 105 | |
| 106 | strlcpy(link_path, "/sys", sizeof(link_path)); |
| 107 | strlcat(link_path, devpath, sizeof(link_path)); |
| 108 | len = readlink(link_path, link_target, sizeof(link_target)); |
| 109 | if (len <= 0) |
| 110 | return -1; |
| 111 | link_target[len] = '\0'; |
| 112 | dbg("path link '%s' points to '%s'", devpath, link_target); |
| 113 | |
| 114 | for (back = 0; strncmp(&link_target[back * 3], "../", 3) == 0; back++) |
| 115 | ; |
| 116 | dbg("base '%s', tail '%s', back %i", devpath, &link_target[back * 3], back); |
| 117 | for (i = 0; i <= back; i++) { |
| 118 | char *pos = strrchr(devpath, '/'); |
| 119 | |
| 120 | if (pos == NULL) |
| 121 | return -1; |
| 122 | pos[0] = '\0'; |
| 123 | } |
| 124 | dbg("after moving back '%s'", devpath); |
| 125 | strlcat(devpath, "/", size); |
| 126 | strlcat(devpath, &link_target[back * 3], size); |
| 127 | return 0; |
| 128 | } |
| 129 | |
| 130 | |
| 131 | static int device_list_insert(const char *path) |
| 132 | { |
| 133 | char filename[PATH_SIZE]; |
| 134 | char devpath[PATH_SIZE]; |
| 135 | struct stat statbuf; |
| 136 | |
| 137 | dbg("add '%s'" , path); |
| 138 | |
| 139 | /* we only have a device, if we have an uevent file */ |
| 140 | strlcpy(filename, path, sizeof(filename)); |
| 141 | strlcat(filename, "/uevent", sizeof(filename)); |
| 142 | if (stat(filename, &statbuf) < 0) |
| 143 | return -1; |
| 144 | if (!(statbuf.st_mode & S_IWUSR)) |
| 145 | return -1; |
| 146 | |
| 147 | strlcpy(devpath, &path[4], sizeof(devpath)); |
| 148 | |
| 149 | /* resolve possible link to real target */ |
| 150 | if (lstat(path, &statbuf) < 0) |
| 151 | return -1; |
| 152 | if (S_ISLNK(statbuf.st_mode)) |
| 153 | if (sysfs_resolve_link(devpath, sizeof(devpath)) != 0) |
| 154 | return -1; |
| 155 | |
| 156 | trigger_uevent(devpath); |
| 157 | return 0; |
| 158 | } |
| 159 | |
| 160 | |
| 161 | static void scan_subsystem(const char *subsys) |
| 162 | { |
| 163 | char base[PATH_SIZE]; |
| 164 | DIR *dir; |
| 165 | struct dirent *dent; |
| 166 | |
| 167 | strlcpy(base, "/sys/", sizeof(base)); |
| 168 | strlcat(base, subsys, sizeof(base)); |
| 169 | |
| 170 | dir = opendir(base); |
| 171 | if (dir != NULL) { |
| 172 | for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) { |
| 173 | char dirname[PATH_SIZE]; |
| 174 | DIR *dir2; |
| 175 | struct dirent *dent2; |
| 176 | |
| 177 | if (dent->d_name[0] == '.') |
| 178 | continue; |
| 179 | |
| 180 | strlcpy(dirname, base, sizeof(dirname)); |
| 181 | strlcat(dirname, "/", sizeof(dirname)); |
| 182 | strlcat(dirname, dent->d_name, sizeof(dirname)); |
| 183 | strlcat(dirname, "/devices", sizeof(dirname)); |
| 184 | |
| 185 | /* look for devices */ |
| 186 | dir2 = opendir(dirname); |
| 187 | if (dir2 != NULL) { |
| 188 | for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) { |
| 189 | char dirname2[PATH_SIZE]; |
| 190 | |
| 191 | if (dent2->d_name[0] == '.') |
| 192 | continue; |
| 193 | |
| 194 | strlcpy(dirname2, dirname, sizeof(dirname2)); |
| 195 | strlcat(dirname2, "/", sizeof(dirname2)); |
| 196 | strlcat(dirname2, dent2->d_name, sizeof(dirname2)); |
| 197 | device_list_insert(dirname2); |
| 198 | } |
| 199 | closedir(dir2); |
| 200 | } |
| 201 | } |
| 202 | closedir(dir); |
| 203 | } |
| 204 | } |
| 205 | |
| 206 | static void scan_block(void) |
| 207 | { |
| 208 | char base[PATH_SIZE]; |
| 209 | DIR *dir; |
| 210 | struct dirent *dent; |
| 211 | |
| 212 | strlcpy(base, "/sys/block", sizeof(base)); |
| 213 | |
| 214 | dir = opendir(base); |
| 215 | if (dir != NULL) { |
| 216 | for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) { |
| 217 | char dirname[PATH_SIZE]; |
| 218 | DIR *dir2; |
| 219 | struct dirent *dent2; |
| 220 | |
| 221 | if (dent->d_name[0] == '.') |
| 222 | continue; |
| 223 | |
| 224 | strlcpy(dirname, base, sizeof(dirname)); |
| 225 | strlcat(dirname, "/", sizeof(dirname)); |
| 226 | strlcat(dirname, dent->d_name, sizeof(dirname)); |
| 227 | if (device_list_insert(dirname) != 0) |
| 228 | continue; |
| 229 | |
| 230 | /* look for partitions */ |
| 231 | dir2 = opendir(dirname); |
| 232 | if (dir2 != NULL) { |
| 233 | for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) { |
| 234 | char dirname2[PATH_SIZE]; |
| 235 | |
| 236 | if (dent2->d_name[0] == '.') |
| 237 | continue; |
| 238 | |
| 239 | if (!strcmp(dent2->d_name,"device")) |
| 240 | continue; |
| 241 | |
| 242 | strlcpy(dirname2, dirname, sizeof(dirname2)); |
| 243 | strlcat(dirname2, "/", sizeof(dirname2)); |
| 244 | strlcat(dirname2, dent2->d_name, sizeof(dirname2)); |
| 245 | device_list_insert(dirname2); |
| 246 | } |
| 247 | closedir(dir2); |
| 248 | } |
| 249 | } |
| 250 | closedir(dir); |
| 251 | } |
| 252 | } |
| 253 | |
| 254 | static void scan_class(void) |
| 255 | { |
| 256 | char base[PATH_SIZE]; |
| 257 | DIR *dir; |
| 258 | struct dirent *dent; |
| 259 | |
| 260 | strlcpy(base, "/sys/class", sizeof(base)); |
| 261 | |
| 262 | dir = opendir(base); |
| 263 | if (dir != NULL) { |
| 264 | for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) { |
| 265 | char dirname[PATH_SIZE]; |
| 266 | DIR *dir2; |
| 267 | struct dirent *dent2; |
| 268 | |
| 269 | if (dent->d_name[0] == '.') |
| 270 | continue; |
| 271 | |
| 272 | strlcpy(dirname, base, sizeof(dirname)); |
| 273 | strlcat(dirname, "/", sizeof(dirname)); |
| 274 | strlcat(dirname, dent->d_name, sizeof(dirname)); |
| 275 | dir2 = opendir(dirname); |
| 276 | if (dir2 != NULL) { |
| 277 | for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) { |
| 278 | char dirname2[PATH_SIZE]; |
| 279 | |
| 280 | if (dent2->d_name[0] == '.') |
| 281 | continue; |
| 282 | |
| 283 | if (!strcmp(dent2->d_name, "device")) |
| 284 | continue; |
| 285 | |
| 286 | strlcpy(dirname2, dirname, sizeof(dirname2)); |
| 287 | strlcat(dirname2, "/", sizeof(dirname2)); |
| 288 | strlcat(dirname2, dent2->d_name, sizeof(dirname2)); |
| 289 | device_list_insert(dirname2); |
| 290 | } |
| 291 | closedir(dir2); |
| 292 | } |
| 293 | } |
| 294 | closedir(dir); |
| 295 | } |
| 296 | } |
| 297 | |
| 298 | int main(int argc, char *argv[], char *envp[]) |
| 299 | { |
| 300 | char base[PATH_SIZE]; |
| 301 | struct stat statbuf; |
| 302 | int failed = 0; |
| 303 | int option; |
| 304 | |
| 305 | openlog("udevtrigger", LOG_PID | LOG_CONS, LOG_DAEMON); |
| 306 | |
| 307 | while (1) { |
| 308 | option = getopt(argc, argv, "vnh"); |
| 309 | if (option == -1) |
| 310 | break; |
| 311 | |
| 312 | switch (option) { |
| 313 | case 'v': |
| 314 | verbose = 1; |
| 315 | break; |
| 316 | case 'n': |
| 317 | dry_run = 1; |
| 318 | break; |
| 319 | case 'h': |
| 320 | printf("Usage: udevtrigger OPTIONS\n" |
| 321 | " -v print the list of devices while running\n" |
| 322 | " -n do not actually trigger the events\n" |
| 323 | " -h print this text\n" |
| 324 | "\n"); |
| 325 | goto exit; |
| 326 | default: |
| 327 | goto exit; |
| 328 | } |
| 329 | } |
| 330 | |
| 331 | |
| 332 | /* if we have /sys/subsystem, forget all the old stuff */ |
| 333 | scan_subsystem("bus"); |
| 334 | scan_class(); |
| 335 | |
| 336 | /* scan "block" if it isn't a "class" */ |
| 337 | strlcpy(base, "/sys/class/block", sizeof(base)); |
| 338 | if (stat(base, &statbuf) != 0) |
| 339 | scan_block(); |
| 340 | |
| 341 | exit: |
| 342 | |
| 343 | closelog(); |
| 344 | return 0; |
| 345 | } |
| 346 | |
