#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
+#include <ctype.h>
#include "udev.h"
#include "udev_version.h"
+#include "namedev.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 char *get_device(void)
+static inline char *get_devpath(void)
{
- static char device[255];
- char *temp;
-
- temp = getenv("DEVPATH");
- if (temp == NULL)
- return NULL;
- strcpy(device, SYSFS_ROOT);
- strcat(device, temp);
+ char *devpath;
- return device;
+ devpath = getenv("DEVPATH");
+ return devpath;
}
-/*
- * Right now the major/minor of a device is stored in a file called
- * "dev" in sysfs.
- * The number is stored as:
- * MMmm
- * MM is the major
- * mm is the minor
- * The value is in hex.
- * Yes, this will probably change when we go to a bigger major/minor
- * range, and will have to be changed at that time.
- */
-static int get_major_minor (char *dev, int *major, int *minor)
+static inline char *get_seqnum(void)
{
- char filename[255];
- char line[20];
- char temp[3];
- int fd;
- int retval = 0;
-
- /* add the dev file to the directory and see if it's present */
- strncpy(filename, dev, sizeof(filename));
- strncat(filename, DEV_FILE, sizeof(filename));
- fd = open(filename, O_RDONLY);
- if (fd < 0) {
- dbg("Can't open %s", filename);
- return -ENODEV;
- }
-
- /* get the major/minor */
- retval = read(fd, line, sizeof(line));
- if (retval < 0) {
- dbg("read error on %s", dev);
- goto exit;
- }
+ char *seqnum;
- temp[0] = line[0];
- temp[1] = line[1];
- temp[2] = 0x00;
- *major = (int)strtol(&temp[0], NULL, 16);
-
- temp[0] = line[2];
- temp[1] = line[3];
- temp[2] = 0x00;
- *minor = (int)strtol(&temp[0], NULL, 16);
-
- dbg("found major = %d, minor = %d", *major, *minor);
-
- retval = 0;
-exit:
- close(fd);
- return retval;
+ seqnum = getenv("SEQNUM");
+ return seqnum;
}
-/*
- * Here would go a call to the naming deamon, to get the name we want to have
- * for this device. But for now, let's just default to whatever the kernel is
- * calling the device as that will keep the "old-style" naming policy
- */
-static char *get_name(char *dev, int major, int minor)
-{
- static char name[100];
- char *temp;
+#ifdef USE_DBUS
- temp = strrchr(dev, '/');
- if (temp == NULL)
- return NULL;
- strncpy(name, &temp[1], sizeof(name));
-
- dbg("name is %s", name);
-
- return &name[0];
-}
-
-/*
- * Again, this will live in the naming deamon
+/** Global variable for the connection the to system message bus or #NULL
+ * if we cannot connect or acquire the org.kernel.udev service
*/
-static int get_mode(char *name, char *dev, int major, int minor)
-{
- /* just default everyone to rw for the world! */
- return 0666;
-}
+DBusConnection* sysbus_connection;
-/*
- * We also want to add some permissions here, and possibly some symlinks
- */
-static int create_node(char *name, char type, int major, int minor, int mode)
+/** Disconnect from the system message bus */
+static void sysbus_disconnect()
{
- char *argv[7];
- char mode_string[100];
- char type_string[3];
- char major_string[20];
- char minor_string[20];
- char filename[255];
- int retval = 0;
-
- strncpy(filename, UDEV_ROOT, sizeof(filename));
- strncat(filename, name, sizeof(filename));
-
- snprintf(mode_string, sizeof(mode_string), "--mode=%#o", mode);
- snprintf(type_string, sizeof(type_string), "%c", type);
- snprintf(major_string, sizeof(major_string), "%d", major);
- snprintf(minor_string, sizeof(minor_string), "%d", minor);
-
- argv[0] = MKNOD;
- argv[1] = mode_string;
- argv[2] = filename;
- argv[3] = type_string;
- argv[4] = major_string;
- argv[5] = minor_string;
- argv[6] = NULL;
- dbg ("executing %s %s %s %s %s %s",
- argv[0], argv[1], argv[2], argv[3], argv[4], argv[5]);
- switch (fork()) {
- case 0:
- /* we are the child, so lets run the program */
- execv (MKNOD, argv);
- exit(0);
- break;
- case (-1):
- dbg ("fork failed.");
- retval = -EFAULT;
- break;
- default:
- break;
- }
- return retval;
-}
+ if (sysbus_connection == NULL)
+ return;
-static int remove_node(char *name)
-{
- return 0;
+ dbus_connection_disconnect(sysbus_connection);
+ sysbus_connection = NULL;
}
-static int do_it(char *action, char *name, char type, int major, int minor, int mode)
+/** Connect to the system message bus */
+static void sysbus_connect()
{
- if (strcmp(action, "add") == 0)
- return create_node(name, type, major, minor, mode);
-
- if (strcmp(action, "remove") == 0)
- return remove_node(name);
-
- dbg("Unknown action: %s", action);
- return -EINVAL;
+ 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;
+ }
}
-int main(int argc, char *argv[])
+#endif /* USE_DBUS */
+
+int main(int argc, char **argv, char **envp)
{
- char *subsystem;
char *action;
- char *device;
- char *name;
- char type;
- int major;
- int minor;
- int mode;
+ 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;
}
- /* for now, the block layer is the only place where block devices are */
subsystem = argv[1];
- if (strcmp(subsystem, "block") == 0)
- type = 'b';
- else
- type = 'c';
- action = get_action();
- if (!action) {
- dbg ("no action?");
+ devpath = get_devpath();
+ if (!devpath) {
+ dbg ("no devpath?");
goto exit;
}
+ dbg("looking at '%s'", devpath);
- device = get_device();
- if (!device) {
- dbg ("no device?");
+ /* we only care about class devices and block stuff */
+ if (!strstr(devpath, "class") &&
+ !strstr(devpath, "block")) {
+ dbg("not a block or class device");
goto exit;
}
- dbg("looking at %s", device);
- retval = get_major_minor(device, &major, &minor);
- if (retval) {
- dbg ("get_major_minor failed");
+ /* but we don't care about net class devices */
+ if (strcmp(subsystem, "net") == 0) {
+ dbg("don't care about net devices");
goto exit;
}
- name = get_name(device, major, minor);
- if (name == NULL) {
- dbg ("get_name failed");
- retval = -ENODEV;
+ action = get_action();
+ if (!action) {
+ dbg ("no action?");
goto exit;
}
- mode = get_mode(name, device, major, minor);
- if (mode < 0) {
- dbg ("get_mode failed");
- retval = -EINVAL;
+ /* 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");
goto exit;
}
- retval = do_it(action, name, type, major, minor, mode);
- if (retval) {
- dbg ("do_it failed");
- goto exit;
+ /* initialize the naming deamon */
+ namedev_init();
+
+ if (strcmp(action, "add") == 0)
+ retval = udev_add_device(devpath, subsystem);
+
+ else if (strcmp(action, "remove") == 0)
+ retval = udev_remove_device(devpath, subsystem);
+
+ else {
+ dbg("unknown action '%s'", action);
+ retval = -EINVAL;
}
+ udevdb_exit();
+
+#ifdef USE_DBUS
+ /* disconnect from the system message bus */
+ sysbus_disconnect();
+#endif /* USE_DBUS */
- retval = 0;
exit:
return retval;
}
-
~ianmdlvl / elogind.git / blobdiff