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[] = {
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);
145 /* Ignore any device mapper devices that aren't logical volumes */
146 devname = udev_device_get_property_value(dev, "DM_NAME");
147 if (devname && ! udev_device_get_property_value(dev, "DM_LV_NAME")) {
148 pb_debug("SKIP: dm-device %s\n", devname);
152 type = udev_device_get_property_value(dev, "ID_FS_TYPE");
154 pb_log("SKIP: %s: no ID_FS_TYPE property\n", name);
158 while (ignored_types[i]) {
159 if (!strncmp(type, ignored_types[i], strlen(ignored_types[i]))) {
160 pb_log("SKIP: %s: ignore '%s' filesystem\n", name, type);
166 /* Search for LVM logical volumes if we see an LVM member */
167 if (strncmp(type, "LVM2_member", strlen("LVM2_member")) == 0) {
168 lvm_vg_search(udev->handler);
172 /* We may see multipath devices; they'll have the same uuid as an
173 * existing device, so only parse the first. */
174 uuid = udev_device_get_property_value(dev, "ID_FS_UUID");
176 ddev = device_lookup_by_uuid(udev->handler, uuid);
178 pb_log("SKIP: %s UUID [%s] already present (as %s)\n",
179 name, uuid, ddev->device->id);
184 /* Use DM_NAME for logical volumes, or the device name otherwise */
185 ddev = discover_device_create(udev->handler, uuid, devname ?: name);
189 * For logical volumes udev_device_get_devnode() returns a path
190 * of the form "/dev/dm-xx". These nodes names are not
191 * persistent and are opaque to the user. Instead use the more
192 * recognisable "/dev/mapper/lv-name" node if it is available.
194 devlinks = talloc_strdup(ddev,
195 udev_device_get_property_value(dev, "DEVLINKS"));
196 link = devlinks ? strtok_r(devlinks, " ", &saveptr) : NULL;
198 if (strncmp(link, "/dev/mapper/",
199 strlen("/dev/mapper/")) == 0) {
203 link = strtok_r(NULL, " ", &saveptr);
207 ddev->device_path = talloc_strdup(ddev, node);
208 talloc_free(devlinks);
211 ddev->uuid = talloc_strdup(ddev, uuid);
212 prop = udev_device_get_property_value(dev, "ID_FS_LABEL");
214 ddev->label = talloc_strdup(ddev, prop);
216 usb = !!udev_device_get_property_value(dev, "ID_USB_DRIVER");
218 ddev->device->type = DEVICE_TYPE_OPTICAL;
220 ddev->device->type = usb ? DEVICE_TYPE_USB : DEVICE_TYPE_DISK;
222 udev_setup_device_params(dev, ddev);
224 /* Create a snapshot for all disk devices */
225 if ((ddev->device->type == DEVICE_TYPE_DISK ||
226 ddev->device->type == DEVICE_TYPE_USB))
227 devmapper_init_snapshot(udev->handler, ddev);
229 device_handler_discover(udev->handler, ddev);
235 * Mark valid interfaces as 'ready'.
236 * The udev_enumerate_add_match_is_initialized() filter in udev_enumerate()
237 * ensures that any device we see is properly initialized by udev (eg. interface
238 * names); here we check that the properties are sane and mark the interface
239 * as ready for configuration in discover/network.
241 static int udev_check_interface_ready(struct device_handler *handler,
242 struct udev_device *dev)
244 const char *name, *ifindex, *interface, *mac_name;
250 name = udev_device_get_sysname(dev);
252 pb_debug("udev_device_get_sysname failed\n");
256 ifindex = udev_device_get_property_value(dev, "IFINDEX");
257 interface = udev_device_get_property_value(dev, "INTERFACE");
258 mac_name = udev_device_get_property_value(dev, "ID_NET_NAME_MAC");
260 /* Physical interfaces should have all of these properties */
261 if (!ifindex || !interface || !mac_name) {
262 pb_debug("%s: interface %s missing properties\n",
267 /* ID_NET_NAME_MAC format is enxMACADDR */
268 if (strlen(mac_name) < 15) {
269 pb_debug("%s: Unexpected MAC format: %s\n",
274 mac = talloc_array(handler, uint8_t, HWADDR_SIZE);
279 * ID_NET_NAME_MAC is not a conventionally formatted MAC
280 * string - convert it before passing it to network.c
283 for (i = strlen("enx"), j = 0;
284 i < strlen(mac_name) && j < HWADDR_SIZE; i += 2) {
285 memcpy(byte, &mac_name[i], 2);
286 mac[j++] = strtoul(byte, NULL, 16);
289 network_mark_interface_ready(handler,
290 atoi(ifindex), interface, mac, HWADDR_SIZE);
296 static int udev_handle_dev_add(struct pb_udev *udev, struct udev_device *dev)
301 name = udev_device_get_sysname(dev);
303 pb_debug("udev_device_get_sysname failed\n");
307 subsys = udev_device_get_subsystem(dev);
309 pb_debug("udev_device_get_subsystem failed\n");
313 /* If we see a net device, check if it is ready to be used */
314 if (!strncmp(subsys, "net", strlen("net")))
315 return udev_check_interface_ready(udev->handler, dev);
317 if (device_lookup_by_id(udev->handler, name)) {
318 pb_debug("device %s is already present?\n", name);
322 if (!strcmp(subsys, "block")) {
323 return udev_handle_block_add(udev, dev, name);
326 pb_log("SKIP %s: unknown subsystem %s\n", name, subsys);
331 static int udev_handle_dev_remove(struct pb_udev *udev, struct udev_device *dev)
333 struct discover_device *ddev;
336 name = udev_device_get_sysname(dev);
338 pb_debug("udev_device_get_sysname failed\n");
342 ddev = device_lookup_by_id(udev->handler, name);
346 device_handler_remove(udev->handler, ddev);
351 /* returns true if further event processing should stop (eg., we've
354 static bool udev_handle_cdrom_events(struct pb_udev *udev,
355 struct udev_device *dev, struct discover_device *ddev)
360 node = udev_device_get_devnode(dev);
362 /* handle CDROM eject requests */
363 if (udev_device_get_property_value(dev, "DISK_EJECT_REQUEST")) {
364 pb_debug("udev: eject request\n");
366 /* If the device is mounted, cdrom_id's own eject request may
367 * have failed. So, we'll need to do our own here.
370 eject = ddev->mounted;
371 udev_handle_dev_remove(udev, dev);
380 if (udev_device_get_property_value(dev, "DISK_MEDIA_CHANGE")) {
381 if (cdrom_media_present(node))
382 udev_handle_dev_add(udev, dev);
384 udev_handle_dev_remove(udev, dev);
391 static int udev_handle_dev_change(struct pb_udev *udev, struct udev_device *dev)
393 struct discover_device *ddev;
398 name = udev_device_get_sysname(dev);
399 subsys = udev_device_get_subsystem(dev);
401 /* If we see a net device, check if it is ready to be used */
402 if (!strncmp(subsys, "net", strlen("net")))
403 return udev_check_interface_ready(udev->handler, dev);
405 ddev = device_lookup_by_id(udev->handler, name);
407 /* if this is a CDROM device, process eject & media change requests;
408 * these may stop further processing */
409 if (!udev_device_get_property_value(dev, "ID_CDROM")) {
410 if (udev_handle_cdrom_events(udev, dev, ddev))
414 /* if this is a new device, treat it as an add */
416 rc = udev_handle_dev_add(udev, dev);
421 static int udev_handle_dev_action(struct udev_device *dev, const char *action)
423 struct pb_udev *udev = udev_get_userdata(udev_device_get_udev(dev));
424 struct udev_list_entry *list;
427 list = udev_device_get_properties_list_entry(dev);
428 name = udev_device_get_sysname(dev);
430 pb_debug("udev: action %s, device %s\n", action, name);
431 pb_debug("udev: properties:\n");
433 for (; list; list = udev_list_entry_get_next(list))
434 pb_debug("\t%-20s: %s\n", udev_list_entry_get_name(list),
435 udev_list_entry_get_value(list));
437 if (!strcmp(action, "add"))
438 return udev_handle_dev_add(udev, dev);
440 else if (!strcmp(action, "remove"))
441 return udev_handle_dev_remove(udev, dev);
443 else if (!strcmp(action, "change"))
444 return udev_handle_dev_change(udev, dev);
449 static int udev_enumerate(struct udev *udev)
452 struct udev_list_entry *list, *entry;
453 struct udev_enumerate *enumerate;
455 enumerate = udev_enumerate_new(udev);
458 pb_log("udev_enumerate_new failed\n");
462 result = udev_enumerate_add_match_subsystem(enumerate, "block");
464 pb_log("udev_enumerate_add_match_subsystem failed\n");
468 result = udev_enumerate_add_match_subsystem(enumerate, "net");
470 pb_log("udev_enumerate_add_match_subsystem failed\n");
474 result = udev_enumerate_add_match_is_initialized(enumerate);
476 pb_log("udev_enumerate_add_match_is_initialised failed\n");
480 udev_enumerate_scan_devices(enumerate);
482 list = udev_enumerate_get_list_entry(enumerate);
484 udev_list_entry_foreach(entry, list) {
486 struct udev_device *dev;
488 syspath = udev_list_entry_get_name(entry);
489 dev = udev_device_new_from_syspath(udev, syspath);
491 udev_handle_dev_action(dev, "add");
493 udev_device_unref(dev);
496 udev_enumerate_unref(enumerate);
500 udev_enumerate_unref(enumerate);
504 static int udev_setup_monitor(struct udev *udev, struct udev_monitor **monitor)
507 struct udev_monitor *m;
510 m = udev_monitor_new_from_netlink(udev, "udev");
513 pb_log("udev_monitor_new_from_netlink failed\n");
517 result = udev_monitor_set_receive_buffer_size(m, monitor_bufsize);
519 pb_log("udev_monitor_set_rx_bufsize(%d) failed\n",
523 result = udev_monitor_filter_add_match_subsystem_devtype(m, "block",
527 pb_log("udev_monitor_filter_add_match_subsystem_devtype failed\n");
531 result = udev_monitor_filter_add_match_subsystem_devtype(m, "net",
535 pb_log("udev_monitor_filter_add_match_subsystem_devtype failed\n");
539 result = udev_monitor_enable_receiving(m);
542 pb_log("udev_monitor_enable_receiving failed\n");
550 udev_monitor_unref(m);
555 * udev_process - waiter callback for monitor netlink.
558 static int udev_process(void *arg)
560 struct udev_monitor *monitor = arg;
561 struct udev_device *dev;
564 dev = udev_monitor_receive_device(monitor);
566 pb_log("udev_monitor_receive_device failed\n");
570 action = udev_device_get_action(dev);
573 pb_log("udev_device_get_action failed\n");
575 udev_handle_dev_action(dev, action);
578 udev_device_unref(dev);
583 static void udev_log_fn(struct udev __attribute__((unused)) *udev,
584 int __attribute__((unused)) priority, const char *file, int line,
585 const char *fn, const char *format, va_list args)
587 pb_log("libudev: %s %s:%d: ", fn, file, line);
588 vfprintf(pb_log_get_stream(), format, args);
592 struct pb_udev *udev_init(struct device_handler *handler,
593 struct waitset *waitset)
595 struct pb_udev *udev;
598 udev = talloc_zero(handler, struct pb_udev);
599 talloc_set_destructor(udev, udev_destructor);
600 udev->handler = handler;
602 udev->udev = udev_new();
605 pb_log("udev_new failed\n");
609 udev_set_userdata(udev->udev, udev);
612 udev_set_log_fn(udev->udev, udev_log_fn);
615 result = udev_setup_monitor(udev->udev, &udev->monitor);
619 result = udev_enumerate(udev->udev);
623 waiter_register_io(waitset, udev_monitor_get_fd(udev->monitor), WAIT_IN,
624 udev_process, udev->monitor);
626 pb_debug("%s: waiting on udev\n", __func__);
635 void udev_reinit(struct pb_udev *udev)
637 pb_log("udev: reinit requested, starting enumeration\n");
638 udev_enumerate(udev->udev);