/*
* libudev - interface to udev device information
*
- * Copyright (C) 2004-2009 Kay Sievers <kay.sievers@vrfy.org>
+ * Copyright (C) 2003-2009 Kay Sievers <kay.sievers@vrfy.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
#include "libudev.h"
#include "libudev-private.h"
-int util_create_path(struct udev *udev, const char *path)
+static int create_path(struct udev *udev, const char *path, bool selinux)
{
char p[UTIL_PATH_SIZE];
char *pos;
struct stat stats;
- int ret;
+ int err;
util_strscpy(p, sizeof(p), path);
pos = strrchr(p, '/');
- if (pos == p || pos == NULL)
+ if (pos == NULL)
return 0;
-
- while (pos[-1] == '/')
+ while (pos != p && pos[-1] == '/')
pos--;
+ if (pos == p)
+ return 0;
pos[0] = '\0';
dbg(udev, "stat '%s'\n", p);
- if (stat(p, &stats) == 0 && (stats.st_mode & S_IFMT) == S_IFDIR)
- return 0;
+ if (stat(p, &stats) == 0) {
+ if ((stats.st_mode & S_IFMT) == S_IFDIR)
+ return 0;
+ else
+ return -ENOTDIR;
+ }
- if (util_create_path(udev, p) != 0)
- return -1;
+ err = util_create_path(udev, p);
+ if (err != 0)
+ return err;
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;
+ if (selinux)
+ udev_selinux_setfscreatecon(udev, p, S_IFDIR|0755);
+ err = mkdir(p, 0755);
+ if (err != 0) {
+ err = -errno;
+ if (err == -EEXIST && stat(p, &stats) == 0) {
+ if ((stats.st_mode & S_IFMT) == S_IFDIR)
+ err = 0;
+ else
+ err = -ENOTDIR;
+ }
+ }
+ if (selinux)
+ udev_selinux_resetfscreatecon(udev);
+ return err;
+}
- if (errno == EEXIST)
- if (stat(p, &stats) == 0 && (stats.st_mode & S_IFMT) == S_IFDIR)
- return 0;
- return -1;
+int util_create_path(struct udev *udev, const char *path)
+{
+ return create_path(udev, path, false);
+}
+
+int util_create_path_selinux(struct udev *udev, const char *path)
+{
+ return create_path(udev, path, true);
}
int util_delete_path(struct udev *udev, const char *path)
{
char p[UTIL_PATH_SIZE];
char *pos;
- int retval;
+ int err = 0;
- strcpy (p, path);
+ if (path[0] == '/')
+ while(path[1] == '/')
+ path++;
+ util_strscpy(p, sizeof(p), path);
pos = strrchr(p, '/');
if (pos == p || pos == NULL)
return 0;
- while (1) {
+ for (;;) {
*pos = '\0';
pos = strrchr(p, '/');
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);
+ err = rmdir(p);
+ if (err < 0) {
+ if (errno == ENOENT)
+ err = 0;
break;
}
- dbg(udev, "removed '%s'\n", p);
}
- return 0;
+ return err;
}
/* Reset permissions on the device node, before unlinking it to make sure,
- * that permisions of possible hard links will be removed too.
+ * that permissions of possible hard links will be removed too.
*/
int util_unlink_secure(struct udev *udev, const char *filename)
{
- int retval;
-
- retval = chown(filename, 0, 0);
- if (retval)
- err(udev, "chown(%s, 0, 0) failed: %m\n", filename);
+ int err;
- retval = chmod(filename, 0000);
- if (retval)
- err(udev, "chmod(%s, 0000) failed: %m\n", filename);
-
- retval = unlink(filename);
+ chown(filename, 0, 0);
+ chmod(filename, 0000);
+ err = unlink(filename);
if (errno == ENOENT)
- retval = 0;
-
- if (retval)
+ err = 0;
+ if (err)
err(udev, "unlink(%s) failed: %m\n", filename);
-
- return retval;
+ return err;
}
uid_t util_lookup_user(struct udev *udev, const char *user)
{
char *endptr;
- int buflen = sysconf(_SC_GETPW_R_SIZE_MAX);
+ size_t buflen = sysconf(_SC_GETPW_R_SIZE_MAX);
char buf[buflen];
struct passwd pwbuf;
struct passwd *pw;
if (endptr[0] == '\0')
return uid;
- errno = 0;
- getpwnam_r(user, &pwbuf, buf, buflen, &pw);
+ errno = getpwnam_r(user, &pwbuf, buf, buflen, &pw);
if (pw != NULL)
return pw->pw_uid;
if (errno == 0 || errno == ENOENT || errno == ESRCH)
gid_t util_lookup_group(struct udev *udev, const char *group)
{
char *endptr;
- int buflen = sysconf(_SC_GETGR_R_SIZE_MAX);
- char buf[buflen];
+ size_t buflen = sysconf(_SC_GETGR_R_SIZE_MAX);
+ char *buf;
struct group grbuf;
struct group *gr;
gid_t gid = 0;
gid = strtoul(group, &endptr, 10);
if (endptr[0] == '\0')
return gid;
+ buf = NULL;
+ gid = 0;
+ for (;;) {
+ char *newbuf;
- errno = 0;
- 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;
+ newbuf = realloc(buf, buflen);
+ if (!newbuf)
+ break;
+ buf = newbuf;
+ errno = getgrnam_r(group, &grbuf, buf, buflen, &gr);
+ if (gr != NULL) {
+ gid = gr->gr_gid;
+ } else if (errno == ERANGE) {
+ buflen *= 2;
+ continue;
+ } else 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);
+ }
+ break;
+ }
+ free(buf);
+ return gid;
}
/* handle "[<SUBSYSTEM>/<KERNEL>]<attribute>" format */
}
int util_run_program(struct udev *udev, const char *command, char **envp,
- char *result, size_t ressize, size_t *reslen)
+ char *result, size_t ressize, size_t *reslen,
+ const sigset_t *sigmask, bool reset_prio)
{
int status;
int outpipe[2] = {-1, -1};
pid_t pid;
char arg[UTIL_PATH_SIZE];
char program[UTIL_PATH_SIZE];
- char *argv[(sizeof(arg) / 2) + 1];
+ char *argv[((sizeof(arg) + 1) / 2) + 1];
int devnull;
int i;
int err = 0;
+ info(udev, "'%s' started\n", command);
+
/* build argv from command */
util_strscpy(arg, sizeof(arg), command);
i = 0;
/* do not separate quotes */
pos++;
argv[i] = strsep(&pos, "\'");
- while (pos != NULL && pos[0] == ' ')
- pos++;
+ if (pos != NULL)
+ while (pos[0] == ' ')
+ pos++;
} else {
argv[i] = strsep(&pos, " ");
+ if (pos != NULL)
+ while (pos[0] == ' ')
+ pos++;
}
dbg(udev, "arg[%i] '%s'\n", i, argv[i]);
i++;
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) {
dup2(errpipe[WRITE_END], STDERR_FILENO);
close(errpipe[WRITE_END]);
}
+
+ if (sigmask)
+ sigprocmask(SIG_SETMASK, sigmask, NULL);
+ if (reset_prio)
+ setpriority(PRIO_PROCESS, 0, 0);
+
execve(argv[0], argv, envp);
if (errno == ENOENT || errno == ENOTDIR) {
- /* may be on a filesytem which is not mounted right now */
+ /* may be on a filesystem which is not mounted right now */
info(udev, "program '%s' not found\n", argv[0]);
} else {
/* other problems */
if (errpipe[READ_END] > 0)
close(errpipe[READ_END]);
- /* return the childs stdout string */
+ /* return the child's stdout string */
if (result) {
result[respos] = '\0';
dbg(udev, "result='%s'\n", result);
}
waitpid(pid, &status, 0);
if (WIFEXITED(status)) {
- info(udev, "'%s' returned with status %i\n", argv[0], WEXITSTATUS(status));
+ info(udev, "'%s' returned with exitcode %i\n", command, WEXITSTATUS(status));
if (WEXITSTATUS(status) != 0)
err = -1;
} else {
- err(udev, "'%s' abnormal exit\n", command);
+ err(udev, "'%s' unexpected exit with status 0x%04x\n", command, status);
err = -1;
}
}
~ianmdlvl / elogind.git / blobdiff