#include <fcntl.h>
#include <errno.h>
#include <ctype.h>
-#include <dirent.h>
-#include <syslog.h>
#include <pwd.h>
#include <grp.h>
-#include <sys/types.h>
-#include <sys/utsname.h>
+#include <sys/wait.h>
#include "udev.h"
-struct name_entry *name_list_add(struct udev *udev, struct list_head *name_list, const char *name, int sort)
+int util_create_path(struct udev *udev, const char *path)
{
- struct name_entry *name_loop;
- struct name_entry *name_new;
-
- /* avoid duplicate entries */
- list_for_each_entry(name_loop, name_list, node) {
- if (strcmp(name_loop->name, name) == 0) {
- dbg(udev, "'%s' is already in the list\n", name);
- return name_loop;
- }
- }
+ char p[UTIL_PATH_SIZE];
+ char *pos;
+ struct stat stats;
+ int ret;
- if (sort)
- list_for_each_entry(name_loop, name_list, node) {
- if (strcmp(name_loop->name, name) > 0)
- break;
- }
+ util_strlcpy(p, path, sizeof(p));
+ pos = strrchr(p, '/');
+ if (pos == p || pos == NULL)
+ return 0;
- name_new = malloc(sizeof(struct name_entry));
- if (name_new == NULL)
- return NULL;
- memset(name_new, 0x00, sizeof(struct name_entry));
- util_strlcpy(name_new->name, name, sizeof(name_new->name));
- dbg(udev, "adding '%s'\n", name_new->name);
- list_add_tail(&name_new->node, &name_loop->node);
+ while (pos[-1] == '/')
+ pos--;
+ pos[0] = '\0';
- return name_new;
-}
+ dbg(udev, "stat '%s'\n", p);
+ if (stat(p, &stats) == 0 && (stats.st_mode & S_IFMT) == S_IFDIR)
+ return 0;
-struct name_entry *name_list_key_add(struct udev *udev, struct list_head *name_list, const char *key, const char *value)
-{
- struct name_entry *name_loop;
- struct name_entry *name_new;
- size_t keylen = strlen(key);
-
- list_for_each_entry(name_loop, name_list, node) {
- if (strncmp(name_loop->name, key, keylen) != 0)
- continue;
- if (name_loop->name[keylen] != '=')
- continue;
- dbg(udev, "key already present '%s', replace it\n", name_loop->name);
- snprintf(name_loop->name, sizeof(name_loop->name), "%s=%s", key, value);
- name_loop->name[sizeof(name_loop->name)-1] = '\0';
- return name_loop;
- }
+ if (util_create_path(udev, p) != 0)
+ return -1;
- name_new = malloc(sizeof(struct name_entry));
- if (name_new == NULL)
- return NULL;
- memset(name_new, 0x00, sizeof(struct name_entry));
- snprintf(name_new->name, sizeof(name_new->name), "%s=%s", key, value);
- name_new->name[sizeof(name_new->name)-1] = '\0';
- dbg(udev, "adding '%s'\n", name_new->name);
- list_add_tail(&name_new->node, &name_loop->node);
+ dbg(udev, "mkdir '%s'\n", p);
+ udev_selinux_setfscreatecon(udev, p, S_IFDIR|0755);
+ ret = mkdir(p, 0755);
+ udev_selinux_resetfscreatecon(udev);
+ if (ret == 0)
+ return 0;
- return name_new;
+ if (errno == EEXIST)
+ if (stat(p, &stats) == 0 && (stats.st_mode & S_IFMT) == S_IFDIR)
+ return 0;
+ return -1;
}
-int name_list_key_remove(struct udev *udev, struct list_head *name_list, const char *key)
+int util_delete_path(struct udev *udev, const char *path)
{
- struct name_entry *name_loop;
- struct name_entry *name_tmp;
- size_t keylen = strlen(key);
- int retval = 0;
-
- list_for_each_entry_safe(name_loop, name_tmp, name_list, node) {
- if (strncmp(name_loop->name, key, keylen) != 0)
- continue;
- if (name_loop->name[keylen] != '=')
- continue;
- list_del(&name_loop->node);
- free(name_loop);
- retval = 1;
- break;
+ char p[UTIL_PATH_SIZE];
+ char *pos;
+ int retval;
+
+ strcpy (p, path);
+ pos = strrchr(p, '/');
+ if (pos == p || pos == NULL)
+ return 0;
+
+ while (1) {
+ *pos = '\0';
+ pos = strrchr(p, '/');
+
+ /* don't remove the last one */
+ if ((pos == p) || (pos == NULL))
+ break;
+
+ /* remove if empty */
+ retval = rmdir(p);
+ if (errno == ENOENT)
+ retval = 0;
+ if (retval) {
+ if (errno == ENOTEMPTY)
+ return 0;
+ err(udev, "rmdir(%s) failed: %m\n", p);
+ break;
+ }
+ dbg(udev, "removed '%s'\n", p);
}
- return retval;
+ return 0;
}
-void name_list_cleanup(struct udev *udev, struct list_head *name_list)
+/* Reset permissions on the device node, before unlinking it to make sure,
+ * that permisions of possible hard links will be removed too.
+ */
+int util_unlink_secure(struct udev *udev, const char *filename)
{
- struct name_entry *name_loop;
- struct name_entry *name_tmp;
+ int retval;
- list_for_each_entry_safe(name_loop, name_tmp, name_list, node) {
- list_del(&name_loop->node);
- free(name_loop);
- }
+ retval = chown(filename, 0, 0);
+ if (retval)
+ err(udev, "chown(%s, 0, 0) failed: %m\n", filename);
+
+ retval = chmod(filename, 0000);
+ if (retval)
+ err(udev, "chmod(%s, 0000) failed: %m\n", filename);
+
+ retval = unlink(filename);
+ if (errno == ENOENT)
+ retval = 0;
+
+ if (retval)
+ err(udev, "unlink(%s) failed: %m\n", filename);
+
+ return retval;
}
-uid_t lookup_user(struct udev *udev, const char *user)
+uid_t util_lookup_user(struct udev *udev, const char *user)
{
+ char *endptr;
+ int buflen = sysconf(_SC_GETPW_R_SIZE_MAX);
+ char buf[buflen];
+ struct passwd pwbuf;
struct passwd *pw;
- uid_t uid = 0;
+ uid_t uid;
- errno = 0;
- pw = getpwnam(user);
- if (pw == NULL) {
- if (errno == 0 || errno == ENOENT || errno == ESRCH)
- err(udev, "specified user '%s' unknown\n", user);
- else
- err(udev, "error resolving user '%s': %m\n", user);
- } else
- uid = pw->pw_uid;
+ if (strcmp(user, "root") == 0)
+ return 0;
+ uid = strtoul(user, &endptr, 10);
+ if (endptr[0] == '\0')
+ return uid;
- return uid;
+ errno = 0;
+ getpwnam_r(user, &pwbuf, buf, buflen, &pw);
+ if (pw != NULL)
+ return pw->pw_uid;
+ if (errno == 0 || errno == ENOENT || errno == ESRCH)
+ err(udev, "specified user '%s' unknown\n", user);
+ else
+ err(udev, "error resolving user '%s': %m\n", user);
+ return 0;
}
-extern gid_t lookup_group(struct udev *udev, const char *group)
+extern gid_t util_lookup_group(struct udev *udev, const char *group)
{
+ char *endptr;
+ int buflen = sysconf(_SC_GETGR_R_SIZE_MAX);
+ char buf[buflen];
+ struct group grbuf;
struct group *gr;
gid_t gid = 0;
+ if (strcmp(group, "root") == 0)
+ return 0;
+ gid = strtoul(group, &endptr, 10);
+ if (endptr[0] == '\0')
+ return gid;
+
errno = 0;
- gr = getgrnam(group);
- if (gr == NULL) {
- if (errno == 0 || errno == ENOENT || errno == ESRCH)
- err(udev, "specified group '%s' unknown\n", group);
+ getgrnam_r(group, &grbuf, buf, buflen, &gr);
+ if (gr != NULL)
+ return gr->gr_gid;
+ if (errno == 0 || errno == ENOENT || errno == ESRCH)
+ err(udev, "specified group '%s' unknown\n", group);
+ else
+ err(udev, "error resolving group '%s': %m\n", group);
+ return 0;
+}
+
+/* handle "[<SUBSYSTEM>/<KERNEL>]<attribute>" format */
+int util_resolve_subsys_kernel(struct udev *udev, const char *string,
+ char *result, size_t maxsize, int read_value)
+{
+ char temp[UTIL_PATH_SIZE];
+ char *subsys;
+ char *sysname;
+ struct udev_device *dev;
+ char *attr;
+
+ if (string == NULL)
+ string = result;
+ if (string[0] != '[')
+ return -1;
+
+ util_strlcpy(temp, string, sizeof(temp));
+
+ subsys = &temp[1];
+
+ sysname = strchr(subsys, '/');
+ if (sysname == NULL)
+ return -1;
+ sysname[0] = '\0';
+ sysname = &sysname[1];
+
+ attr = strchr(sysname, ']');
+ if (attr == NULL)
+ return -1;
+ attr[0] = '\0';
+ attr = &attr[1];
+ if (attr[0] == '/')
+ attr = &attr[1];
+ if (attr[0] == '\0')
+ attr = NULL;
+
+ if (read_value && attr == NULL)
+ return -1;
+
+ dev = udev_device_new_from_subsystem_sysname(udev, subsys, sysname);
+ if (dev == NULL)
+ return -1;
+
+ if (read_value) {
+ const char *val;
+
+ val = udev_device_get_sysattr_value(dev, attr);
+ if (val != NULL)
+ util_strlcpy(result, val, maxsize);
else
- err(udev, "error resolving group '%s': %m\n", group);
- } else
- gid = gr->gr_gid;
+ result[0] = '\0';
+ info(udev, "value '[%s/%s]%s' is '%s'\n", subsys, sysname, attr, result);
+ } else {
+ util_strlcpy(result, udev_device_get_syspath(dev), maxsize);
+ if (attr != NULL) {
+ util_strlcat(result, "/", maxsize);
+ util_strlcat(result, attr, maxsize);
+ }
+ info(udev, "path '[%s/%s]%s' is '%s'\n", subsys, sysname, attr, result);
+ }
+ udev_device_unref(dev);
+ return 0;
+}
+
+int util_run_program(struct udev *udev, const char *command, char **envp,
+ char *result, size_t ressize, size_t *reslen)
+{
+ int status;
+ int outpipe[2] = {-1, -1};
+ int errpipe[2] = {-1, -1};
+ pid_t pid;
+ char arg[UTIL_PATH_SIZE];
+ char program[UTIL_PATH_SIZE];
+ char *argv[(sizeof(arg) / 2) + 1];
+ int devnull;
+ int i;
+ int err = 0;
+
+ /* build argv from command */
+ util_strlcpy(arg, command, sizeof(arg));
+ i = 0;
+ if (strchr(arg, ' ') != NULL) {
+ char *pos = arg;
+
+ while (pos != NULL && pos[0] != '\0') {
+ if (pos[0] == '\'') {
+ /* do not separate quotes */
+ pos++;
+ argv[i] = strsep(&pos, "\'");
+ while (pos != NULL && pos[0] == ' ')
+ pos++;
+ } else {
+ argv[i] = strsep(&pos, " ");
+ }
+ dbg(udev, "arg[%i] '%s'\n", i, argv[i]);
+ i++;
+ }
+ argv[i] = NULL;
+ } else {
+ argv[0] = arg;
+ argv[1] = NULL;
+ }
+ info(udev, "'%s'\n", command);
+
+ /* prepare pipes from child to parent */
+ if (result != NULL || udev_get_log_priority(udev) >= LOG_INFO) {
+ if (pipe(outpipe) != 0) {
+ err(udev, "pipe failed: %m\n");
+ return -1;
+ }
+ }
+ if (udev_get_log_priority(udev) >= LOG_INFO) {
+ if (pipe(errpipe) != 0) {
+ err(udev, "pipe failed: %m\n");
+ return -1;
+ }
+ }
+
+ /* allow programs in /lib/udev/ to be called without the path */
+ if (strchr(argv[0], '/') == NULL) {
+ util_strlcpy(program, UDEV_PREFIX "/lib/udev/", sizeof(program));
+ util_strlcat(program, argv[0], sizeof(program));
+ argv[0] = program;
+ }
- return gid;
+ pid = fork();
+ switch(pid) {
+ case 0:
+ /* child closes parent ends of pipes */
+ if (outpipe[READ_END] > 0)
+ close(outpipe[READ_END]);
+ if (errpipe[READ_END] > 0)
+ close(errpipe[READ_END]);
+
+ /* discard child output or connect to pipe */
+ devnull = open("/dev/null", O_RDWR);
+ if (devnull > 0) {
+ dup2(devnull, STDIN_FILENO);
+ if (outpipe[WRITE_END] < 0)
+ dup2(devnull, STDOUT_FILENO);
+ if (errpipe[WRITE_END] < 0)
+ dup2(devnull, STDERR_FILENO);
+ close(devnull);
+ } else
+ err(udev, "open /dev/null failed: %m\n");
+ if (outpipe[WRITE_END] > 0) {
+ dup2(outpipe[WRITE_END], STDOUT_FILENO);
+ close(outpipe[WRITE_END]);
+ }
+ if (errpipe[WRITE_END] > 0) {
+ dup2(errpipe[WRITE_END], STDERR_FILENO);
+ close(errpipe[WRITE_END]);
+ }
+ execve(argv[0], argv, envp);
+ if (errno == ENOENT || errno == ENOTDIR) {
+ /* may be on a filesytem which is not mounted right now */
+ info(udev, "program '%s' not found\n", argv[0]);
+ } else {
+ /* other problems */
+ err(udev, "exec of program '%s' failed\n", argv[0]);
+ }
+ _exit(1);
+ case -1:
+ err(udev, "fork of '%s' failed: %m\n", argv[0]);
+ return -1;
+ default:
+ /* read from child if requested */
+ if (outpipe[READ_END] > 0 || errpipe[READ_END] > 0) {
+ ssize_t count;
+ size_t respos = 0;
+
+ /* parent closes child ends of pipes */
+ if (outpipe[WRITE_END] > 0)
+ close(outpipe[WRITE_END]);
+ if (errpipe[WRITE_END] > 0)
+ close(errpipe[WRITE_END]);
+
+ /* read child output */
+ while (outpipe[READ_END] > 0 || errpipe[READ_END] > 0) {
+ int fdcount;
+ fd_set readfds;
+
+ FD_ZERO(&readfds);
+ if (outpipe[READ_END] > 0)
+ FD_SET(outpipe[READ_END], &readfds);
+ if (errpipe[READ_END] > 0)
+ FD_SET(errpipe[READ_END], &readfds);
+ fdcount = select(UDEV_MAX(outpipe[READ_END], errpipe[READ_END])+1, &readfds, NULL, NULL, NULL);
+ if (fdcount < 0) {
+ if (errno == EINTR)
+ continue;
+ err = -1;
+ break;
+ }
+
+ /* get stdout */
+ if (outpipe[READ_END] > 0 && FD_ISSET(outpipe[READ_END], &readfds)) {
+ char inbuf[1024];
+ char *pos;
+ char *line;
+
+ count = read(outpipe[READ_END], inbuf, sizeof(inbuf)-1);
+ if (count <= 0) {
+ close(outpipe[READ_END]);
+ outpipe[READ_END] = -1;
+ if (count < 0) {
+ err(udev, "stdin read failed: %m\n");
+ err = -1;
+ }
+ continue;
+ }
+ inbuf[count] = '\0';
+
+ /* store result for rule processing */
+ if (result) {
+ if (respos + count < ressize) {
+ memcpy(&result[respos], inbuf, count);
+ respos += count;
+ } else {
+ err(udev, "ressize %ld too short\n", (long)ressize);
+ err = -1;
+ }
+ }
+ pos = inbuf;
+ while ((line = strsep(&pos, "\n")))
+ if (pos || line[0] != '\0')
+ info(udev, "'%s' (stdout) '%s'\n", argv[0], line);
+ }
+
+ /* get stderr */
+ if (errpipe[READ_END] > 0 && FD_ISSET(errpipe[READ_END], &readfds)) {
+ char errbuf[1024];
+ char *pos;
+ char *line;
+
+ count = read(errpipe[READ_END], errbuf, sizeof(errbuf)-1);
+ if (count <= 0) {
+ close(errpipe[READ_END]);
+ errpipe[READ_END] = -1;
+ if (count < 0)
+ err(udev, "stderr read failed: %m\n");
+ continue;
+ }
+ errbuf[count] = '\0';
+ pos = errbuf;
+ while ((line = strsep(&pos, "\n")))
+ if (pos || line[0] != '\0')
+ info(udev, "'%s' (stderr) '%s'\n", argv[0], line);
+ }
+ }
+ if (outpipe[READ_END] > 0)
+ close(outpipe[READ_END]);
+ if (errpipe[READ_END] > 0)
+ close(errpipe[READ_END]);
+
+ /* return the childs stdout string */
+ if (result) {
+ result[respos] = '\0';
+ dbg(udev, "result='%s'\n", result);
+ if (reslen)
+ *reslen = respos;
+ }
+ }
+ waitpid(pid, &status, 0);
+ if (WIFEXITED(status)) {
+ info(udev, "'%s' returned with status %i\n", argv[0], WEXITSTATUS(status));
+ if (WEXITSTATUS(status) != 0)
+ err = -1;
+ } else {
+ err(udev, "'%s' abnormal exit\n", command);
+ err = -1;
+ }
+ }
+ return err;
}
~ianmdlvl / elogind.git / blobdiff