#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
+#include <ctype.h>
#include "udev.h"
#include "udev_version.h"
#include "udevdb.h"
#include "libsysfs/libsysfs.h"
+/* global variables */
+char **main_argv;
+char **main_envp;
-static char *get_action(void)
+static inline char *get_action(void)
{
char *action;
return action;
}
+static inline char *get_devpath(void)
+{
+ char *devpath;
+
+ devpath = getenv("DEVPATH");
+ return devpath;
+}
+
+static inline char *get_seqnum(void)
+{
+ char *seqnum;
+
+ seqnum = getenv("SEQNUM");
+ return seqnum;
+}
+
+#ifdef USE_DBUS
+
+/** Global variable for the connection the to system message bus or #NULL
+ * if we cannot connect or acquire the org.kernel.udev service
+ */
+DBusConnection* sysbus_connection;
-static char *get_device(void)
+/** Disconnect from the system message bus */
+static void sysbus_disconnect()
{
- char *device;
+ if (sysbus_connection == NULL)
+ return;
- device = getenv("DEVPATH");
- return device;
+ dbus_connection_disconnect(sysbus_connection);
+ sysbus_connection = NULL;
}
-int main(int argc, char *argv[])
+/** Connect to the system message bus */
+static void sysbus_connect()
+{
+ DBusError error;
+
+ /* Connect to a well-known bus instance, the system bus */
+ dbus_error_init(&error);
+ sysbus_connection = dbus_bus_get(DBUS_BUS_SYSTEM, &error);
+ if (sysbus_connection == NULL) {
+ dbg("cannot connect to system message bus, error %s: %s",
+ error.name, error.message);
+ dbus_error_free(&error);
+ return;
+ }
+
+ /* Acquire the org.kernel.udev service such that listeners
+ * know that the message is really from us and not from a
+ * random attacker. See the file udev_sysbus_policy.conf for
+ * details.
+ *
+ * Note that a service can have multiple owners (though there
+ * is a concept of a primary owner for reception of messages)
+ * so no race is introduced if two copies of udev is running
+ * at the same time.
+ */
+ dbus_bus_acquire_service(sysbus_connection, "org.kernel.udev", 0,
+ &error);
+ if (dbus_error_is_set(&error)) {
+ printf("cannot acquire org.kernel.udev service, error %s: %s'",
+ error.name, error.message);
+ sysbus_disconnect();
+ return;
+ }
+}
+
+#endif /* USE_DBUS */
+
+int main(int argc, char **argv, char **envp)
{
char *action;
- char *device;
+ char *devpath;
char *subsystem;
int retval = -EINVAL;
+ main_argv = argv;
+ main_envp = envp;
+
+ dbg("version %s", UDEV_VERSION);
+
if (argc != 2) {
dbg ("unknown number of arguments");
goto exit;
subsystem = argv[1];
- device = get_device();
- if (!device) {
- dbg ("no device?");
+ devpath = get_devpath();
+ if (!devpath) {
+ dbg ("no devpath?");
goto exit;
}
- dbg("looking at %s", device);
+ dbg("looking at '%s'", devpath);
/* we only care about class devices and block stuff */
- if (!strstr(device, "class") &&
- !strstr(device, "block")) {
- dbg("not block or class");
+ if (!strstr(devpath, "class") &&
+ !strstr(devpath, "block")) {
+ dbg("not a block or class device");
goto exit;
}
goto exit;
}
+ /* initialize our configuration */
+ udev_init_config();
+
+#ifdef USE_DBUS
+ /* connect to the system message bus */
+ sysbus_connect();
+#endif /* USE_DBUS */
+
/* initialize udev database */
retval = udevdb_init(UDEVDB_DEFAULT);
if (retval != 0) {
- dbg("Unable to initialize database.");
+ dbg("unable to initialize database");
goto exit;
}
namedev_init();
if (strcmp(action, "add") == 0)
- retval = udev_add_device(device, argv[1]);
+ retval = udev_add_device(devpath, subsystem);
else if (strcmp(action, "remove") == 0)
- retval = udev_remove_device(device, argv[1]);
+ retval = udev_remove_device(devpath, subsystem);
else {
- dbg("Unknown action: %s", action);
+ dbg("unknown action '%s'", action);
retval = -EINVAL;
}
udevdb_exit();
+#ifdef USE_DBUS
+ /* disconnect from the system message bus */
+ sysbus_disconnect();
+#endif /* USE_DBUS */
+
exit:
return retval;
}
-