udev: convert 'uaccess' to a builtin

[elogind.git] / src / udev / udev-builtin-uaccess.c

diff --git a/src/udev/udev-builtin-uaccess.c b/src/udev/udev-builtin-uaccess.c
new file mode 100644 (file)
index 0000000..662bac9
--- /dev/null
+++ b/src/udev/udev-builtin-uaccess.c
@@ -0,0 +1,99 @@
+/*
+ * manage device node user ACL
+ *
+ * Copyright 2010-2012 Kay Sievers <kay@vrfy.org>
+ * Copyright 2010 Lennart Poettering
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <unistd.h>
+#include <string.h>
+#include <ctype.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <dirent.h>
+#include <getopt.h>
+
+#include <systemd/sd-daemon.h>
+#include <systemd/sd-login.h>
+#include "logind-acl.h"
+#include "udev.h"
+#include "util.h"
+
+static int builtin_uaccess(struct udev_device *dev, int argc, char *argv[], bool test)
+{
+        int r;
+        const char *path = NULL, *seat;
+        bool changed_acl = false;
+        uid_t uid;
+
+        log_set_target(LOG_TARGET_AUTO);
+        log_parse_environment();
+        log_open();
+
+        umask(0022);
+
+        /* don't muck around with ACLs when the system is not running systemd */
+        if (!sd_booted())
+                return 0;
+
+        path = udev_device_get_devnode(dev);
+        seat = udev_device_get_property_value(dev, "ID_SEAT");
+        if (!seat)
+                seat = "seat0";
+
+        r = sd_seat_get_active(seat, NULL, &uid);
+        if (r == -ENOENT) {
+                /* No active session on this seat */
+                r = 0;
+                goto finish;
+        } else if (r < 0) {
+                log_error("Failed to determine active user on seat %s.", seat);
+                goto finish;
+        }
+
+        r = devnode_acl(path, true, false, 0, true, uid);
+        if (r < 0) {
+                log_error("Failed to apply ACL on %s: %s", path, strerror(-r));
+                goto finish;
+        }
+
+        changed_acl = true;
+        r = 0;
+
+finish:
+        if (path && !changed_acl) {
+                int k;
+
+                /* Better be safe than sorry and reset ACL */
+                k = devnode_acl(path, true, false, 0, false, 0);
+                if (k < 0) {
+                        log_error("Failed to apply ACL on %s: %s", path, strerror(-k));
+                        if (r >= 0)
+                                r = k;
+                }
+        }
+
+        return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}
+
+const struct udev_builtin udev_builtin_uaccess = {
+        .name = "uaccess",
+        .cmd = builtin_uaccess,
+        .help = "manage device node user ACL",
+};