2 #if defined(HAVE_CONFIG_H)
13 #include <sys/socket.h>
14 #include <sys/types.h>
18 #include <types/types.h>
19 #include <talloc/talloc.h>
20 #include <waiter/waiter.h>
21 #include <system/system.h>
22 #include <process/process.h>
26 #include "pb-discover.h"
27 #include "device-handler.h"
29 #include "devmapper.h"
32 /* We set a default monitor buffer size, as we may not process monitor
33 * events while performing device discvoery. systemd uses a 128M buffer, so
34 * we'll do the same here */
35 static const int monitor_bufsize = 128 * 1024 * 1024;
39 struct udev_monitor *monitor;
40 struct device_handler *handler;
43 static int udev_destructor(void *p)
45 struct pb_udev *udev = p;
48 udev_monitor_unref(udev->monitor);
53 udev_unref(udev->udev);
60 static void udev_setup_device_params(struct udev_device *udev,
61 struct discover_device *dev)
63 struct udev_list_entry *list, *entry;
65 list = udev_device_get_properties_list_entry(udev);
69 udev_list_entry_foreach(entry, list)
70 discover_device_set_param(dev,
71 udev_list_entry_get_name(entry),
72 udev_list_entry_get_value(entry));
76 * Search for LVM logical volumes. If any exist they should be recognised
78 * Normally this is handled in an init script, but on some platforms
79 * disks are slow enough to come up that we need to check again.
81 static void lvm_vg_search(struct device_handler *handler)
83 if (process_run_simple(handler, pb_system_apps.vgscan, "-qq", NULL))
84 pb_log_fn("Failed to execute vgscan\n");
86 if (process_run_simple(handler, pb_system_apps.vgchange, "-ay", "-qq",
88 pb_log_fn("Failed to execute vgchange\n");
91 static int udev_handle_block_add(struct pb_udev *udev, struct udev_device *dev,
94 char *devlinks = NULL, *link, *saveptr = NULL;
95 struct discover_device *ddev;
104 const char *ignored_types[] = {
109 bool cdrom, usb, luks = false;
111 typestr = udev_device_get_devtype(dev);
113 pb_debug("udev_device_get_devtype failed\n");
117 if (!(!strcmp(typestr, "disk") || !strcmp(typestr, "partition"))) {
118 pb_log("SKIP %s: invalid type %s\n", name, typestr);
122 node = udev_device_get_devnode(dev);
123 path = udev_device_get_devpath(dev);
124 if (path && strstr(path, "virtual/block/loop")) {
125 pb_log("SKIP: %s: ignored (path=%s)\n", name, path);
129 if (path && strstr(path, "virtual/block/ram")) {
130 device_handler_add_ramdisk(udev->handler, node);
134 cdrom = node && !!udev_device_get_property_value(dev, "ID_CDROM");
136 /* CDROMs require a little initialisation, to get
137 * petitboot-compatible tray behaviour */
139 if (!cdrom_media_present(node)) {
140 pb_log("SKIP: %s: no media present\n", name);
146 * Ignore any device mapper devices that aren't logical volumes or
147 * opened encrypted devices
149 devname = udev_device_get_property_value(dev, "DM_NAME");
151 if (device_handler_found_crypt_device(udev->handler, devname)) {
153 } else if (!udev_device_get_property_value(dev, "DM_LV_NAME")) {
154 pb_debug("SKIP: dm-device %s\n", devname);
159 type = udev_device_get_property_value(dev, "ID_FS_TYPE");
161 pb_log("SKIP: %s: no ID_FS_TYPE property\n", name);
165 while (ignored_types[i]) {
166 if (!strncmp(type, ignored_types[i], strlen(ignored_types[i]))) {
167 pb_log("SKIP: %s: ignore '%s' filesystem\n", name, type);
173 /* Search for LVM logical volumes if we see an LVM member */
174 if (strncmp(type, "LVM2_member", strlen("LVM2_member")) == 0) {
175 lvm_vg_search(udev->handler);
179 /* We may see multipath devices; they'll have the same uuid as an
180 * existing device, so only parse the first. */
181 uuid = udev_device_get_property_value(dev, "ID_FS_UUID");
183 ddev = device_lookup_by_uuid(udev->handler, uuid);
185 pb_log("SKIP: %s UUID [%s] already present (as %s)\n",
186 name, uuid, ddev->device->id);
191 /* Use DM_NAME for logical volumes, or the device name otherwise */
192 ddev = discover_device_create(udev->handler, uuid, devname ?: name);
196 * For logical volumes udev_device_get_devnode() returns a path
197 * of the form "/dev/dm-xx". These nodes names are not
198 * persistent and are opaque to the user. Instead use the more
199 * recognisable "/dev/mapper/lv-name" node if it is available.
201 devlinks = talloc_strdup(ddev,
202 udev_device_get_property_value(dev, "DEVLINKS"));
203 link = devlinks ? strtok_r(devlinks, " ", &saveptr) : NULL;
205 if (strncmp(link, "/dev/mapper/",
206 strlen("/dev/mapper/")) == 0) {
210 link = strtok_r(NULL, " ", &saveptr);
214 ddev->device_path = talloc_strdup(ddev, node);
215 talloc_free(devlinks);
218 ddev->uuid = talloc_strdup(ddev, uuid);
219 prop = udev_device_get_property_value(dev, "ID_FS_LABEL");
221 ddev->label = talloc_strdup(ddev, prop);
223 usb = !!udev_device_get_property_value(dev, "ID_USB_DRIVER");
225 ddev->device->type = DEVICE_TYPE_OPTICAL;
226 else if (strncmp(type, "crypto_LUKS", strlen("crypto_LUKS")) == 0)
227 ddev->device->type = DEVICE_TYPE_LUKS;
229 ddev->device->type = usb ? DEVICE_TYPE_USB : DEVICE_TYPE_DISK;
231 udev_setup_device_params(dev, ddev);
234 * Don't perform discovery on encrypted devices, just register and
237 if (ddev->device->type == DEVICE_TYPE_LUKS) {
238 pb_log("Notifying clients about encrypted device %s\n",
240 device_handler_add_encrypted_dev(udev->handler, ddev);
244 /* Create a snapshot for all disk devices */
245 if ((ddev->device->type == DEVICE_TYPE_DISK ||
246 ddev->device->type == DEVICE_TYPE_USB))
247 devmapper_init_snapshot(udev->handler, ddev);
249 /* Note if this is an opened LUKS device */
250 ddev->crypt_device = luks;
252 device_handler_discover(udev->handler, ddev);
258 * Mark valid interfaces as 'ready'.
259 * The udev_enumerate_add_match_is_initialized() filter in udev_enumerate()
260 * ensures that any device we see is properly initialized by udev (eg. interface
261 * names); here we check that the properties are sane and mark the interface
262 * as ready for configuration in discover/network.
264 static int udev_check_interface_ready(struct device_handler *handler,
265 struct udev_device *dev)
267 const char *name, *ifindex, *interface, *mac_name;
273 name = udev_device_get_sysname(dev);
275 pb_debug("udev_device_get_sysname failed\n");
279 ifindex = udev_device_get_property_value(dev, "IFINDEX");
280 interface = udev_device_get_property_value(dev, "INTERFACE");
281 mac_name = udev_device_get_property_value(dev, "ID_NET_NAME_MAC");
283 /* Physical interfaces should have all of these properties */
284 if (!ifindex || !interface || !mac_name) {
285 pb_debug("%s: interface %s missing properties\n",
290 /* ID_NET_NAME_MAC format is enxMACADDR */
291 if (strlen(mac_name) < 15) {
292 pb_debug("%s: Unexpected MAC format: %s\n",
297 mac = talloc_array(handler, uint8_t, HWADDR_SIZE);
302 * ID_NET_NAME_MAC is not a conventionally formatted MAC
303 * string - convert it before passing it to network.c
306 for (i = strlen("enx"), j = 0;
307 i < strlen(mac_name) && j < HWADDR_SIZE; i += 2) {
308 memcpy(byte, &mac_name[i], 2);
309 mac[j++] = strtoul(byte, NULL, 16);
312 network_mark_interface_ready(handler,
313 atoi(ifindex), interface, mac, HWADDR_SIZE);
319 static int udev_handle_dev_add(struct pb_udev *udev, struct udev_device *dev)
324 name = udev_device_get_sysname(dev);
326 pb_debug("udev_device_get_sysname failed\n");
330 subsys = udev_device_get_subsystem(dev);
332 pb_debug("udev_device_get_subsystem failed\n");
336 /* If we see a net device, check if it is ready to be used */
337 if (!strncmp(subsys, "net", strlen("net")))
338 return udev_check_interface_ready(udev->handler, dev);
340 if (device_lookup_by_id(udev->handler, name)) {
341 pb_debug("device %s is already present?\n", name);
345 if (!strcmp(subsys, "block")) {
346 return udev_handle_block_add(udev, dev, name);
349 pb_log("SKIP %s: unknown subsystem %s\n", name, subsys);
354 static int udev_handle_dev_remove(struct pb_udev *udev, struct udev_device *dev)
356 struct discover_device *ddev;
359 name = udev_device_get_sysname(dev);
361 pb_debug("udev_device_get_sysname failed\n");
365 ddev = device_lookup_by_id(udev->handler, name);
369 device_handler_remove(udev->handler, ddev);
374 /* returns true if further event processing should stop (eg., we've
377 static bool udev_handle_cdrom_events(struct pb_udev *udev,
378 struct udev_device *dev, struct discover_device *ddev)
383 node = udev_device_get_devnode(dev);
385 /* handle CDROM eject requests */
386 if (udev_device_get_property_value(dev, "DISK_EJECT_REQUEST")) {
387 pb_debug("udev: eject request\n");
389 /* If the device is mounted, cdrom_id's own eject request may
390 * have failed. So, we'll need to do our own here.
393 eject = ddev->mounted;
394 udev_handle_dev_remove(udev, dev);
403 if (udev_device_get_property_value(dev, "DISK_MEDIA_CHANGE")) {
404 if (cdrom_media_present(node))
405 udev_handle_dev_add(udev, dev);
407 udev_handle_dev_remove(udev, dev);
414 static int udev_handle_dev_change(struct pb_udev *udev, struct udev_device *dev)
416 struct discover_device *ddev;
421 name = udev_device_get_sysname(dev);
422 subsys = udev_device_get_subsystem(dev);
424 /* If we see a net device, check if it is ready to be used */
425 if (!strncmp(subsys, "net", strlen("net")))
426 return udev_check_interface_ready(udev->handler, dev);
428 ddev = device_lookup_by_id(udev->handler, name);
430 /* if this is a CDROM device, process eject & media change requests;
431 * these may stop further processing */
432 if (!udev_device_get_property_value(dev, "ID_CDROM")) {
433 if (udev_handle_cdrom_events(udev, dev, ddev))
437 /* if this is a new device, treat it as an add */
439 rc = udev_handle_dev_add(udev, dev);
444 static int udev_handle_dev_action(struct udev_device *dev, const char *action)
446 struct pb_udev *udev = udev_get_userdata(udev_device_get_udev(dev));
447 struct udev_list_entry *list;
450 list = udev_device_get_properties_list_entry(dev);
451 name = udev_device_get_sysname(dev);
453 pb_debug("udev: action %s, device %s\n", action, name);
454 pb_debug("udev: properties:\n");
456 for (; list; list = udev_list_entry_get_next(list))
457 pb_debug("\t%-20s: %s\n", udev_list_entry_get_name(list),
458 udev_list_entry_get_value(list));
460 if (!strcmp(action, "add"))
461 return udev_handle_dev_add(udev, dev);
463 else if (!strcmp(action, "remove"))
464 return udev_handle_dev_remove(udev, dev);
466 else if (!strcmp(action, "change"))
467 return udev_handle_dev_change(udev, dev);
472 static int udev_enumerate(struct udev *udev)
475 struct udev_list_entry *list, *entry;
476 struct udev_enumerate *enumerate;
478 enumerate = udev_enumerate_new(udev);
481 pb_log("udev_enumerate_new failed\n");
485 result = udev_enumerate_add_match_subsystem(enumerate, "block");
487 pb_log("udev_enumerate_add_match_subsystem failed\n");
491 result = udev_enumerate_add_match_subsystem(enumerate, "net");
493 pb_log("udev_enumerate_add_match_subsystem failed\n");
497 result = udev_enumerate_add_match_is_initialized(enumerate);
499 pb_log("udev_enumerate_add_match_is_initialised failed\n");
503 udev_enumerate_scan_devices(enumerate);
505 list = udev_enumerate_get_list_entry(enumerate);
507 udev_list_entry_foreach(entry, list) {
509 struct udev_device *dev;
511 syspath = udev_list_entry_get_name(entry);
512 dev = udev_device_new_from_syspath(udev, syspath);
514 udev_handle_dev_action(dev, "add");
516 udev_device_unref(dev);
519 udev_enumerate_unref(enumerate);
523 udev_enumerate_unref(enumerate);
527 static int udev_setup_monitor(struct udev *udev, struct udev_monitor **monitor)
530 struct udev_monitor *m;
533 m = udev_monitor_new_from_netlink(udev, "udev");
536 pb_log("udev_monitor_new_from_netlink failed\n");
540 result = udev_monitor_set_receive_buffer_size(m, monitor_bufsize);
542 pb_log("udev_monitor_set_rx_bufsize(%d) failed\n",
546 result = udev_monitor_filter_add_match_subsystem_devtype(m, "block",
550 pb_log("udev_monitor_filter_add_match_subsystem_devtype failed\n");
554 result = udev_monitor_filter_add_match_subsystem_devtype(m, "net",
558 pb_log("udev_monitor_filter_add_match_subsystem_devtype failed\n");
562 result = udev_monitor_enable_receiving(m);
565 pb_log("udev_monitor_enable_receiving failed\n");
573 udev_monitor_unref(m);
578 * udev_process - waiter callback for monitor netlink.
581 static int udev_process(void *arg)
583 struct udev_monitor *monitor = arg;
584 struct udev_device *dev;
587 dev = udev_monitor_receive_device(monitor);
589 pb_log("udev_monitor_receive_device failed\n");
593 action = udev_device_get_action(dev);
596 pb_log("udev_device_get_action failed\n");
598 udev_handle_dev_action(dev, action);
601 udev_device_unref(dev);
606 static void udev_log_fn(struct udev __attribute__((unused)) *udev,
607 int __attribute__((unused)) priority, const char *file, int line,
608 const char *fn, const char *format, va_list args)
610 pb_log("libudev: %s %s:%d: ", fn, file, line);
611 vfprintf(pb_log_get_stream(), format, args);
615 struct pb_udev *udev_init(struct device_handler *handler,
616 struct waitset *waitset)
618 struct pb_udev *udev;
621 udev = talloc_zero(handler, struct pb_udev);
622 talloc_set_destructor(udev, udev_destructor);
623 udev->handler = handler;
625 udev->udev = udev_new();
628 pb_log("udev_new failed\n");
632 udev_set_userdata(udev->udev, udev);
635 udev_set_log_fn(udev->udev, udev_log_fn);
638 result = udev_setup_monitor(udev->udev, &udev->monitor);
642 result = udev_enumerate(udev->udev);
646 waiter_register_io(waitset, udev_monitor_get_fd(udev->monitor), WAIT_IN,
647 udev_process, udev->monitor);
649 pb_debug("%s: waiting on udev\n", __func__);
658 void udev_reinit(struct pb_udev *udev)
660 pb_log("udev: reinit requested, starting enumeration\n");
661 udev_enumerate(udev->udev);