2 * Copyright (C) 2004-2008 Kay Sievers <kay.sievers@vrfy.org>
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
32 int util_create_path(struct udev *udev, const char *path)
34 char p[UTIL_PATH_SIZE];
39 util_strlcpy(p, path, sizeof(p));
40 pos = strrchr(p, '/');
41 if (pos == p || pos == NULL)
44 while (pos[-1] == '/')
48 dbg(udev, "stat '%s'\n", p);
49 if (stat(p, &stats) == 0 && (stats.st_mode & S_IFMT) == S_IFDIR)
52 if (util_create_path(udev, p) != 0)
55 dbg(udev, "mkdir '%s'\n", p);
56 udev_selinux_setfscreatecon(udev, p, S_IFDIR|0755);
58 udev_selinux_resetfscreatecon(udev);
63 if (stat(p, &stats) == 0 && (stats.st_mode & S_IFMT) == S_IFDIR)
68 int util_delete_path(struct udev *udev, const char *path)
70 char p[UTIL_PATH_SIZE];
75 pos = strrchr(p, '/');
76 if (pos == p || pos == NULL)
81 pos = strrchr(p, '/');
83 /* don't remove the last one */
84 if ((pos == p) || (pos == NULL))
92 if (errno == ENOTEMPTY)
94 err(udev, "rmdir(%s) failed: %m\n", p);
97 dbg(udev, "removed '%s'\n", p);
102 /* Reset permissions on the device node, before unlinking it to make sure,
103 * that permisions of possible hard links will be removed too.
105 int util_unlink_secure(struct udev *udev, const char *filename)
109 retval = chown(filename, 0, 0);
111 err(udev, "chown(%s, 0, 0) failed: %m\n", filename);
113 retval = chmod(filename, 0000);
115 err(udev, "chmod(%s, 0000) failed: %m\n", filename);
117 retval = unlink(filename);
122 err(udev, "unlink(%s) failed: %m\n", filename);
127 uid_t util_lookup_user(struct udev *udev, const char *user)
130 int buflen = sysconf(_SC_GETPW_R_SIZE_MAX);
136 if (strcmp(user, "root") == 0)
138 uid = strtoul(user, &endptr, 10);
139 if (endptr[0] == '\0')
143 getpwnam_r(user, &pwbuf, buf, buflen, &pw);
146 if (errno == 0 || errno == ENOENT || errno == ESRCH)
147 err(udev, "specified user '%s' unknown\n", user);
149 err(udev, "error resolving user '%s': %m\n", user);
153 extern gid_t util_lookup_group(struct udev *udev, const char *group)
156 int buflen = sysconf(_SC_GETGR_R_SIZE_MAX);
162 if (strcmp(group, "root") == 0)
164 gid = strtoul(group, &endptr, 10);
165 if (endptr[0] == '\0')
169 getgrnam_r(group, &grbuf, buf, buflen, &gr);
172 if (errno == 0 || errno == ENOENT || errno == ESRCH)
173 err(udev, "specified group '%s' unknown\n", group);
175 err(udev, "error resolving group '%s': %m\n", group);
179 /* handle "[<SUBSYSTEM>/<KERNEL>]<attribute>" format */
180 int util_resolve_subsys_kernel(struct udev *udev, const char *string,
181 char *result, size_t maxsize, int read_value)
183 char temp[UTIL_PATH_SIZE];
186 struct udev_device *dev;
191 if (string[0] != '[')
194 util_strlcpy(temp, string, sizeof(temp));
198 sysname = strchr(subsys, '/');
202 sysname = &sysname[1];
204 attr = strchr(sysname, ']');
214 if (read_value && attr == NULL)
217 dev = udev_device_new_from_subsystem_sysname(udev, subsys, sysname);
224 val = udev_device_get_sysattr_value(dev, attr);
226 util_strlcpy(result, val, maxsize);
229 info(udev, "value '[%s/%s]%s' is '%s'\n", subsys, sysname, attr, result);
231 util_strlcpy(result, udev_device_get_syspath(dev), maxsize);
233 util_strlcat(result, "/", maxsize);
234 util_strlcat(result, attr, maxsize);
236 info(udev, "path '[%s/%s]%s' is '%s'\n", subsys, sysname, attr, result);
238 udev_device_unref(dev);
242 int util_run_program(struct udev *udev, const char *command, char **envp,
243 char *result, size_t ressize, size_t *reslen)
246 int outpipe[2] = {-1, -1};
247 int errpipe[2] = {-1, -1};
249 char arg[UTIL_PATH_SIZE];
250 char program[UTIL_PATH_SIZE];
251 char *argv[(sizeof(arg) / 2) + 1];
256 /* build argv from command */
257 util_strlcpy(arg, command, sizeof(arg));
259 if (strchr(arg, ' ') != NULL) {
262 while (pos != NULL && pos[0] != '\0') {
263 if (pos[0] == '\'') {
264 /* do not separate quotes */
266 argv[i] = strsep(&pos, "\'");
267 while (pos != NULL && pos[0] == ' ')
270 argv[i] = strsep(&pos, " ");
272 dbg(udev, "arg[%i] '%s'\n", i, argv[i]);
280 info(udev, "'%s'\n", command);
282 /* prepare pipes from child to parent */
283 if (result != NULL || udev_get_log_priority(udev) >= LOG_INFO) {
284 if (pipe(outpipe) != 0) {
285 err(udev, "pipe failed: %m\n");
289 if (udev_get_log_priority(udev) >= LOG_INFO) {
290 if (pipe(errpipe) != 0) {
291 err(udev, "pipe failed: %m\n");
296 /* allow programs in /lib/udev/ to be called without the path */
297 if (strchr(argv[0], '/') == NULL) {
298 util_strlcpy(program, UDEV_PREFIX "/lib/udev/", sizeof(program));
299 util_strlcat(program, argv[0], sizeof(program));
306 /* child closes parent ends of pipes */
307 if (outpipe[READ_END] > 0)
308 close(outpipe[READ_END]);
309 if (errpipe[READ_END] > 0)
310 close(errpipe[READ_END]);
312 /* discard child output or connect to pipe */
313 devnull = open("/dev/null", O_RDWR);
315 dup2(devnull, STDIN_FILENO);
316 if (outpipe[WRITE_END] < 0)
317 dup2(devnull, STDOUT_FILENO);
318 if (errpipe[WRITE_END] < 0)
319 dup2(devnull, STDERR_FILENO);
322 err(udev, "open /dev/null failed: %m\n");
323 if (outpipe[WRITE_END] > 0) {
324 dup2(outpipe[WRITE_END], STDOUT_FILENO);
325 close(outpipe[WRITE_END]);
327 if (errpipe[WRITE_END] > 0) {
328 dup2(errpipe[WRITE_END], STDERR_FILENO);
329 close(errpipe[WRITE_END]);
331 execve(argv[0], argv, envp);
332 if (errno == ENOENT || errno == ENOTDIR) {
333 /* may be on a filesytem which is not mounted right now */
334 info(udev, "program '%s' not found\n", argv[0]);
337 err(udev, "exec of program '%s' failed\n", argv[0]);
341 err(udev, "fork of '%s' failed: %m\n", argv[0]);
344 /* read from child if requested */
345 if (outpipe[READ_END] > 0 || errpipe[READ_END] > 0) {
349 /* parent closes child ends of pipes */
350 if (outpipe[WRITE_END] > 0)
351 close(outpipe[WRITE_END]);
352 if (errpipe[WRITE_END] > 0)
353 close(errpipe[WRITE_END]);
355 /* read child output */
356 while (outpipe[READ_END] > 0 || errpipe[READ_END] > 0) {
361 if (outpipe[READ_END] > 0)
362 FD_SET(outpipe[READ_END], &readfds);
363 if (errpipe[READ_END] > 0)
364 FD_SET(errpipe[READ_END], &readfds);
365 fdcount = select(UDEV_MAX(outpipe[READ_END], errpipe[READ_END])+1, &readfds, NULL, NULL, NULL);
374 if (outpipe[READ_END] > 0 && FD_ISSET(outpipe[READ_END], &readfds)) {
379 count = read(outpipe[READ_END], inbuf, sizeof(inbuf)-1);
381 close(outpipe[READ_END]);
382 outpipe[READ_END] = -1;
384 err(udev, "stdin read failed: %m\n");
391 /* store result for rule processing */
393 if (respos + count < ressize) {
394 memcpy(&result[respos], inbuf, count);
397 err(udev, "ressize %ld too short\n", (long)ressize);
402 while ((line = strsep(&pos, "\n")))
403 if (pos || line[0] != '\0')
404 info(udev, "'%s' (stdout) '%s'\n", argv[0], line);
408 if (errpipe[READ_END] > 0 && FD_ISSET(errpipe[READ_END], &readfds)) {
413 count = read(errpipe[READ_END], errbuf, sizeof(errbuf)-1);
415 close(errpipe[READ_END]);
416 errpipe[READ_END] = -1;
418 err(udev, "stderr read failed: %m\n");
421 errbuf[count] = '\0';
423 while ((line = strsep(&pos, "\n")))
424 if (pos || line[0] != '\0')
425 info(udev, "'%s' (stderr) '%s'\n", argv[0], line);
428 if (outpipe[READ_END] > 0)
429 close(outpipe[READ_END]);
430 if (errpipe[READ_END] > 0)
431 close(errpipe[READ_END]);
433 /* return the childs stdout string */
435 result[respos] = '\0';
436 dbg(udev, "result='%s'\n", result);
441 waitpid(pid, &status, 0);
442 if (WIFEXITED(status)) {
443 info(udev, "'%s' returned with status %i\n", argv[0], WEXITSTATUS(status));
444 if (WEXITSTATUS(status) != 0)
447 err(udev, "'%s' abnormal exit\n", argv[0]);