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)
135 if (errno == 0 || errno == ENOENT || errno == ESRCH)
136 err(udev, "specified user '%s' unknown\n", user);
138 err(udev, "error resolving user '%s': %m\n", user);
145 extern gid_t util_lookup_group(struct udev *udev, const char *group)
151 gr = getgrnam(group);
153 if (errno == 0 || errno == ENOENT || errno == ESRCH)
154 err(udev, "specified group '%s' unknown\n", group);
156 err(udev, "error resolving group '%s': %m\n", group);
163 int util_run_program(struct udev *udev, const char *command, char **envp,
164 char *result, size_t ressize, size_t *reslen)
167 int outpipe[2] = {-1, -1};
168 int errpipe[2] = {-1, -1};
170 char arg[UTIL_PATH_SIZE];
171 char program[UTIL_PATH_SIZE];
172 char *argv[(sizeof(arg) / 2) + 1];
177 /* build argv from command */
178 util_strlcpy(arg, command, sizeof(arg));
180 if (strchr(arg, ' ') != NULL) {
183 while (pos != NULL && pos[0] != '\0') {
184 if (pos[0] == '\'') {
185 /* do not separate quotes */
187 argv[i] = strsep(&pos, "\'");
188 while (pos != NULL && pos[0] == ' ')
191 argv[i] = strsep(&pos, " ");
193 dbg(udev, "arg[%i] '%s'\n", i, argv[i]);
201 info(udev, "'%s'\n", command);
203 /* prepare pipes from child to parent */
204 if (result != NULL || udev_get_log_priority(udev) >= LOG_INFO) {
205 if (pipe(outpipe) != 0) {
206 err(udev, "pipe failed: %m\n");
210 if (udev_get_log_priority(udev) >= LOG_INFO) {
211 if (pipe(errpipe) != 0) {
212 err(udev, "pipe failed: %m\n");
217 /* allow programs in /lib/udev/ to be called without the path */
218 if (strchr(argv[0], '/') == NULL) {
219 util_strlcpy(program, UDEV_PREFIX "/lib/udev/", sizeof(program));
220 util_strlcat(program, argv[0], sizeof(program));
227 /* child closes parent ends of pipes */
228 if (outpipe[READ_END] > 0)
229 close(outpipe[READ_END]);
230 if (errpipe[READ_END] > 0)
231 close(errpipe[READ_END]);
233 /* discard child output or connect to pipe */
234 devnull = open("/dev/null", O_RDWR);
236 dup2(devnull, STDIN_FILENO);
237 if (outpipe[WRITE_END] < 0)
238 dup2(devnull, STDOUT_FILENO);
239 if (errpipe[WRITE_END] < 0)
240 dup2(devnull, STDERR_FILENO);
243 err(udev, "open /dev/null failed: %m\n");
244 if (outpipe[WRITE_END] > 0) {
245 dup2(outpipe[WRITE_END], STDOUT_FILENO);
246 close(outpipe[WRITE_END]);
248 if (errpipe[WRITE_END] > 0) {
249 dup2(errpipe[WRITE_END], STDERR_FILENO);
250 close(errpipe[WRITE_END]);
252 execve(argv[0], argv, envp);
253 if (errno == ENOENT || errno == ENOTDIR) {
254 /* may be on a filesytem which is not mounted right now */
255 info(udev, "program '%s' not found\n", argv[0]);
258 err(udev, "exec of program '%s' failed\n", argv[0]);
262 err(udev, "fork of '%s' failed: %m\n", argv[0]);
265 /* read from child if requested */
266 if (outpipe[READ_END] > 0 || errpipe[READ_END] > 0) {
270 /* parent closes child ends of pipes */
271 if (outpipe[WRITE_END] > 0)
272 close(outpipe[WRITE_END]);
273 if (errpipe[WRITE_END] > 0)
274 close(errpipe[WRITE_END]);
276 /* read child output */
277 while (outpipe[READ_END] > 0 || errpipe[READ_END] > 0) {
282 if (outpipe[READ_END] > 0)
283 FD_SET(outpipe[READ_END], &readfds);
284 if (errpipe[READ_END] > 0)
285 FD_SET(errpipe[READ_END], &readfds);
286 fdcount = select(UDEV_MAX(outpipe[READ_END], errpipe[READ_END])+1, &readfds, NULL, NULL, NULL);
295 if (outpipe[READ_END] > 0 && FD_ISSET(outpipe[READ_END], &readfds)) {
300 count = read(outpipe[READ_END], inbuf, sizeof(inbuf)-1);
302 close(outpipe[READ_END]);
303 outpipe[READ_END] = -1;
305 err(udev, "stdin read failed: %m\n");
312 /* store result for rule processing */
314 if (respos + count < ressize) {
315 memcpy(&result[respos], inbuf, count);
318 err(udev, "ressize %ld too short\n", (long)ressize);
323 while ((line = strsep(&pos, "\n")))
324 if (pos || line[0] != '\0')
325 info(udev, "'%s' (stdout) '%s'\n", argv[0], line);
329 if (errpipe[READ_END] > 0 && FD_ISSET(errpipe[READ_END], &readfds)) {
334 count = read(errpipe[READ_END], errbuf, sizeof(errbuf)-1);
336 close(errpipe[READ_END]);
337 errpipe[READ_END] = -1;
339 err(udev, "stderr read failed: %m\n");
342 errbuf[count] = '\0';
344 while ((line = strsep(&pos, "\n")))
345 if (pos || line[0] != '\0')
346 info(udev, "'%s' (stderr) '%s'\n", argv[0], line);
349 if (outpipe[READ_END] > 0)
350 close(outpipe[READ_END]);
351 if (errpipe[READ_END] > 0)
352 close(errpipe[READ_END]);
354 /* return the childs stdout string */
356 result[respos] = '\0';
357 dbg(udev, "result='%s'\n", result);
362 waitpid(pid, &status, 0);
363 if (WIFEXITED(status)) {
364 info(udev, "'%s' returned with status %i\n", argv[0], WEXITSTATUS(status));
365 if (WEXITSTATUS(status) != 0)
368 err(udev, "'%s' abnormal exit\n", argv[0]);