161 lines
3.4 KiB
C
161 lines
3.4 KiB
C
/*
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* Copyright (C) 2004-2008 Kay Sievers <kay.sievers@vrfy.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <stddef.h>
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#include <unistd.h>
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#include <string.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <ctype.h>
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#include <pwd.h>
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#include <grp.h>
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#include "udev.h"
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int create_path(struct udev *udev, const char *path)
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{
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char p[UTIL_PATH_SIZE];
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char *pos;
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struct stat stats;
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int ret;
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util_strlcpy(p, path, sizeof(p));
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pos = strrchr(p, '/');
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if (pos == p || pos == NULL)
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return 0;
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while (pos[-1] == '/')
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pos--;
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pos[0] = '\0';
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dbg(udev, "stat '%s'\n", p);
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if (stat(p, &stats) == 0 && (stats.st_mode & S_IFMT) == S_IFDIR)
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return 0;
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if (create_path(udev, p) != 0)
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return -1;
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dbg(udev, "mkdir '%s'\n", p);
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udev_selinux_setfscreatecon(udev, p, S_IFDIR|0755);
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ret = mkdir(p, 0755);
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udev_selinux_resetfscreatecon(udev);
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if (ret == 0)
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return 0;
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if (errno == EEXIST)
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if (stat(p, &stats) == 0 && (stats.st_mode & S_IFMT) == S_IFDIR)
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return 0;
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return -1;
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}
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int delete_path(struct udev *udev, const char *path)
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{
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char p[UTIL_PATH_SIZE];
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char *pos;
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int retval;
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strcpy (p, path);
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pos = strrchr(p, '/');
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if (pos == p || pos == NULL)
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return 0;
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while (1) {
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*pos = '\0';
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pos = strrchr(p, '/');
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/* don't remove the last one */
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if ((pos == p) || (pos == NULL))
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break;
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/* remove if empty */
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retval = rmdir(p);
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if (errno == ENOENT)
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retval = 0;
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if (retval) {
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if (errno == ENOTEMPTY)
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return 0;
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err(udev, "rmdir(%s) failed: %m\n", p);
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break;
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}
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dbg(udev, "removed '%s'\n", p);
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}
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return 0;
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}
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/* Reset permissions on the device node, before unlinking it to make sure,
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* that permisions of possible hard links will be removed too.
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*/
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int unlink_secure(struct udev *udev, const char *filename)
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{
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int retval;
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retval = chown(filename, 0, 0);
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if (retval)
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err(udev, "chown(%s, 0, 0) failed: %m\n", filename);
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retval = chmod(filename, 0000);
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if (retval)
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err(udev, "chmod(%s, 0000) failed: %m\n", filename);
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retval = unlink(filename);
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if (errno == ENOENT)
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retval = 0;
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if (retval)
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err(udev, "unlink(%s) failed: %m\n", filename);
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return retval;
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}
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uid_t lookup_user(struct udev *udev, const char *user)
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{
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struct passwd *pw;
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uid_t uid = 0;
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errno = 0;
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pw = getpwnam(user);
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if (pw == NULL) {
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if (errno == 0 || errno == ENOENT || errno == ESRCH)
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err(udev, "specified user '%s' unknown\n", user);
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else
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err(udev, "error resolving user '%s': %m\n", user);
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} else
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uid = pw->pw_uid;
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return uid;
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}
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extern gid_t lookup_group(struct udev *udev, const char *group)
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{
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struct group *gr;
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gid_t gid = 0;
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errno = 0;
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gr = getgrnam(group);
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if (gr == NULL) {
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if (errno == 0 || errno == ENOENT || errno == ESRCH)
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err(udev, "specified group '%s' unknown\n", group);
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else
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err(udev, "error resolving group '%s': %m\n", group);
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} else
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gid = gr->gr_gid;
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return gid;
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}
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