-#define _GNU_SOURCE
+#if defined(HAVE_CONFIG_H)
+#include "config.h"
+#endif
-#include <stdlib.h>
+#include <assert.h>
+#include <errno.h>
+#include <libudev.h>
#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
#include <unistd.h>
-#include <errno.h>
-#include <sys/types.h>
#include <sys/socket.h>
+#include <sys/types.h>
#include <sys/un.h>
+#include <log/log.h>
+#include <types/types.h>
#include <talloc/talloc.h>
+#include <waiter/waiter.h>
+#include <system/system.h>
+#include "event.h"
#include "udev.h"
-#include "log.h"
-#include "waiter.h"
#include "pb-discover.h"
#include "device-handler.h"
+#include "cdrom.h"
+#include "devmapper.h"
-#define PBOOT_DEVICE_SOCKET "/tmp/petitboot.udev"
-
-#define max(a, b) ((a) > (b) ? (a) : (b))
+/* We set a default monitor buffer size, as we may not process monitor
+ * events while performing device discvoery. systemd uses a 128M buffer, so
+ * we'll do the same here */
+static const int monitor_bufsize = 128 * 1024 * 1024;
-struct udev {
+struct pb_udev {
+ struct udev *udev;
+ struct udev_monitor *monitor;
struct device_handler *handler;
- int socket;
};
-static void parse_event_params(struct udev_event *event, char *buf, int len)
+static int udev_destructor(void *p)
{
- int param_len, name_len, value_len;
- struct param *param;
- char *sep;
-
- for (; len > 0; len -= param_len + 1, buf += param_len + 1) {
-
- /* find the length of the whole parameter */
- param_len = strnlen(buf, len);
- if (!param_len) {
- /* multiple NULs? skip over */
- param_len = 1;
- continue;
- }
+ struct pb_udev *udev = p;
- /* find the separator */
- sep = memchr(buf, '=', param_len);
- if (!sep)
- continue;
-
- name_len = sep - buf;
- value_len = param_len - name_len - 1;
-
- /* update the params array */
- event->params = talloc_realloc(event, event->params,
- struct param, ++event->n_params);
- param = &event->params[event->n_params - 1];
+ if (udev->monitor) {
+ udev_monitor_unref(udev->monitor);
+ udev->monitor = NULL;
+ }
- param->name = talloc_strndup(event, buf, name_len);
- param->value = talloc_strndup(event, sep + 1, value_len);
+ if (udev->udev) {
+ udev_unref(udev->udev);
+ udev->udev = NULL;
}
+
+ return 0;
}
-static const char *event_param(struct udev_event *event, const char *name)
+static void udev_setup_device_params(struct udev_device *udev,
+ struct discover_device *dev)
{
- int i;
+ struct udev_list_entry *list, *entry;
- for (i = 0; i < event->n_params; i++)
- if (!strcasecmp(event->params[i].name, name))
- return event->params[i].value;
+ list = udev_device_get_properties_list_entry(udev);
+ if (!list)
+ return;
- return NULL;
+ udev_list_entry_foreach(entry, list)
+ discover_device_set_param(dev,
+ udev_list_entry_get_name(entry),
+ udev_list_entry_get_value(entry));
}
-static void print_event(struct udev_event *event)
+static int udev_handle_block_add(struct pb_udev *udev, struct udev_device *dev,
+ const char *name)
{
- const char *action, *params[] = {
- "DEVNAME", "ID_TYPE", "ID_BUS", "ID_FS_UUID", "ID_FS_LABEL",
+ struct discover_device *ddev;
+ unsigned int i = 0;
+ const char *typestr;
+ const char *uuid;
+ const char *path;
+ const char *node;
+ const char *prop;
+ const char *type;
+ const char *devname;
+ const char *ignored_types[] = {
+ "linux_raid_member",
+ "swap",
+ "LVM2_member",
NULL,
};
- int i;
+ bool cdrom, usb;
- action = event->action == UDEV_ACTION_ADD ? "add" : "remove";
+ typestr = udev_device_get_devtype(dev);
+ if (!typestr) {
+ pb_debug("udev_device_get_devtype failed\n");
+ return -1;
+ }
- pb_log("udev %s event:\n", action);
- printf("\tdevice: %s\n", event->device);
+ if (!(!strcmp(typestr, "disk") || !strcmp(typestr, "partition"))) {
+ pb_log("SKIP %s: invalid type %s\n", name, typestr);
+ return 0;
+ }
- for (i = 0; params[i]; i++)
- printf("\t%-12s => %s\n",
- params[i], event_param(event, params[i]));
+ node = udev_device_get_devnode(dev);
+ path = udev_device_get_devpath(dev);
+ if (path && strstr(path, "virtual/block/loop")) {
+ pb_log("SKIP: %s: ignored (path=%s)\n", name, path);
+ return 0;
+ }
-}
+ if (path && strstr(path, "virtual/block/ram")) {
+ device_handler_add_ramdisk(udev->handler, node);
+ return 0;
+ }
-static void handle_udev_message(struct udev *udev, char *buf, int len)
-{
- char *sep, *device;
- enum udev_action action;
- struct udev_event *event;
- int device_len;
-
- /* we should see an <action>@<device>\0 at the head of the buffer */
- sep = strchr(buf, '@');
- if (!sep)
- return;
+ cdrom = node && !!udev_device_get_property_value(dev, "ID_CDROM");
+ if (cdrom) {
+ /* CDROMs require a little initialisation, to get
+ * petitboot-compatible tray behaviour */
+ cdrom_init(node);
+ if (!cdrom_media_present(node)) {
+ pb_log("SKIP: %s: no media present\n", name);
+ return 0;
+ }
+ }
- /* terminate the action string */
- *sep = '\0';
- len -= sep - buf + 1;
+ /* If our environment's udev can recognise them explictly skip any
+ * device mapper devices we encounter */
+ devname = udev_device_get_property_value(dev, "DM_NAME");
+ if (devname) {
+ pb_debug("SKIP: dm-device %s\n", devname);
+ return 0;
+ }
- if (!strcmp(buf, "add")) {
- action = UDEV_ACTION_ADD;
+ type = udev_device_get_property_value(dev, "ID_FS_TYPE");
+ if (!type) {
+ pb_log("SKIP: %s: no ID_FS_TYPE property\n", name);
+ return 0;
+ }
- } else if (!strcmp(buf, "remove")) {
- action = UDEV_ACTION_REMOVE;
+ while (ignored_types[i]) {
+ if (!strncmp(type, ignored_types[i], strlen(ignored_types[i]))) {
+ pb_log("SKIP: %s: ignore '%s' filesystem\n", name, type);
+ return 0;
+ }
+ i++;
+ }
- } else {
- return;
+ /* We may see multipath devices; they'll have the same uuid as an
+ * existing device, so only parse the first. */
+ uuid = udev_device_get_property_value(dev, "ID_FS_UUID");
+ if (uuid) {
+ ddev = device_lookup_by_uuid(udev->handler, uuid);
+ if (ddev) {
+ pb_log("SKIP: %s UUID [%s] already present (as %s)\n",
+ name, uuid, ddev->device->id);
+ return 0;
+ }
}
- /* initialise the device string */
- device = sep + 1;
- device_len = strnlen(device, len);
- if (!device_len)
- return;
+ ddev = discover_device_create(udev->handler, name);
+
+ ddev->device_path = talloc_strdup(ddev, node);
- /* now we have an action and a device, we can construct an event */
- event = talloc(udev, struct udev_event);
- event->action = action;
- event->device = talloc_strndup(event, device, device_len);
- event->n_params = 0;
- event->params = NULL;
+ if (uuid)
+ ddev->uuid = talloc_strdup(ddev, uuid);
+ prop = udev_device_get_property_value(dev, "ID_FS_LABEL");
+ if (prop)
+ ddev->label = talloc_strdup(ddev, prop);
- len -= device_len + 1;
- parse_event_params(event, device + device_len + 1, len);
+ usb = !!udev_device_get_property_value(dev, "ID_USB_DRIVER");
+ if (cdrom)
+ ddev->device->type = DEVICE_TYPE_OPTICAL;
+ else
+ ddev->device->type = usb ? DEVICE_TYPE_USB : DEVICE_TYPE_DISK;
- print_event(event);
+ udev_setup_device_params(dev, ddev);
- device_handler_event(udev->handler, event);
+ /* Create a snapshot for all disks, unless it is an assembled RAID array */
+ if ((ddev->device->type == DEVICE_TYPE_DISK ||
+ ddev->device->type == DEVICE_TYPE_USB) &&
+ !udev_device_get_property_value(dev, "MD_LEVEL"))
+ devmapper_init_snapshot(udev->handler, ddev);
- talloc_free(event);
+ device_handler_discover(udev->handler, ddev);
- return;
+ return 0;
}
-static int udev_process(void *arg)
+static int udev_handle_dev_add(struct pb_udev *udev, struct udev_device *dev)
{
- struct udev *udev = arg;
- char buf[4096];
- int len;
+ const char *subsys;
+ const char *name;
- len = recvfrom(udev->socket, buf, sizeof(buf), 0, NULL, NULL);
+ name = udev_device_get_sysname(dev);
+ if (!name) {
+ pb_debug("udev_device_get_sysname failed\n");
+ return -1;
+ }
+
+ subsys = udev_device_get_subsystem(dev);
+ if (!subsys) {
+ pb_debug("udev_device_get_subsystem failed\n");
+ return -1;
+ }
- if (len < 0) {
- pb_log("udev socket read failed: %s", strerror(errno));
+ if (device_lookup_by_id(udev->handler, name)) {
+ pb_debug("device %s is already present?\n", name);
return -1;
}
- if (len == 0)
+ if (!strcmp(subsys, "block")) {
+ return udev_handle_block_add(udev, dev, name);
+ }
+
+ pb_log("SKIP %s: unknown subsystem %s\n", name, subsys);
+ return -1;
+}
+
+
+static int udev_handle_dev_remove(struct pb_udev *udev, struct udev_device *dev)
+{
+ struct discover_device *ddev;
+ const char *name;
+
+ name = udev_device_get_sysname(dev);
+ if (!name) {
+ pb_debug("udev_device_get_sysname failed\n");
+ return -1;
+ }
+
+ ddev = device_lookup_by_id(udev->handler, name);
+ if (!ddev)
return 0;
- handle_udev_message(udev, buf, len);
+ device_handler_remove(udev->handler, ddev);
return 0;
}
-static int udev_destructor(void *p)
+/* returns true if further event processing should stop (eg., we've
+ * ejected the cdrom)
+ */
+static bool udev_handle_cdrom_events(struct pb_udev *udev,
+ struct udev_device *dev, struct discover_device *ddev)
+{
+ const char *node;
+ bool eject = false;
+
+ node = udev_device_get_devnode(dev);
+
+ /* handle CDROM eject requests */
+ if (udev_device_get_property_value(dev, "DISK_EJECT_REQUEST")) {
+ pb_debug("udev: eject request\n");
+
+ /* If the device is mounted, cdrom_id's own eject request may
+ * have failed. So, we'll need to do our own here.
+ */
+ if (ddev) {
+ eject = ddev->mounted;
+ udev_handle_dev_remove(udev, dev);
+ }
+
+ if (eject)
+ cdrom_eject(node);
+
+ return true;
+ }
+
+ if (udev_device_get_property_value(dev, "DISK_MEDIA_CHANGE")) {
+ if (cdrom_media_present(node))
+ udev_handle_dev_add(udev, dev);
+ else
+ udev_handle_dev_remove(udev, dev);
+ return true;
+ }
+
+ return false;
+}
+
+static int udev_handle_dev_change(struct pb_udev *udev, struct udev_device *dev)
+{
+ struct discover_device *ddev;
+ const char *name;
+ int rc = 0;
+
+ name = udev_device_get_sysname(dev);
+
+ ddev = device_lookup_by_id(udev->handler, name);
+
+ /* if this is a CDROM device, process eject & media change requests;
+ * these may stop further processing */
+ if (!udev_device_get_property_value(dev, "ID_CDROM")) {
+ if (udev_handle_cdrom_events(udev, dev, ddev))
+ return 0;
+ }
+
+ /* if this is a new device, treat it as an add */
+ if (!ddev)
+ rc = udev_handle_dev_add(udev, dev);
+
+ return rc;
+}
+
+static int udev_handle_dev_action(struct udev_device *dev, const char *action)
{
- struct udev *udev = p;
+ struct pb_udev *udev = udev_get_userdata(udev_device_get_udev(dev));
+ struct udev_list_entry *list;
+ const char *name;
+
+ list = udev_device_get_properties_list_entry(dev);
+ name = udev_device_get_sysname(dev);
+
+ pb_debug("udev: action %s, device %s\n", action, name);
+ pb_debug("udev: properties:\n");
+
+ for (; list; list = udev_list_entry_get_next(list))
+ pb_debug("\t%-20s: %s\n", udev_list_entry_get_name(list),
+ udev_list_entry_get_value(list));
+
+ if (!strcmp(action, "add"))
+ return udev_handle_dev_add(udev, dev);
- if (udev->socket >= 0)
- close(udev->socket);
+ else if (!strcmp(action, "remove"))
+ return udev_handle_dev_remove(udev, dev);
+
+ else if (!strcmp(action, "change"))
+ return udev_handle_dev_change(udev, dev);
return 0;
}
-struct udev *udev_init(struct device_handler *handler)
+static int udev_enumerate(struct udev *udev)
{
- struct sockaddr_un addr;
- struct udev *udev;
+ int result;
+ struct udev_list_entry *list, *entry;
+ struct udev_enumerate *enumerate;
- unlink(PBOOT_DEVICE_SOCKET);
+ enumerate = udev_enumerate_new(udev);
- udev = talloc(NULL, struct udev);
+ if (!enumerate) {
+ pb_log("udev_enumerate_new failed\n");
+ return -1;
+ }
- udev->handler = handler;
+ result = udev_enumerate_add_match_subsystem(enumerate, "block");
+ if (result) {
+ pb_log("udev_enumerate_add_match_subsystem failed\n");
+ goto fail;
+ }
+
+ result = udev_enumerate_add_match_is_initialized(enumerate);
+ if (result) {
+ pb_log("udev_enumerate_add_match_is_initialised failed\n");
+ goto fail;
+ }
+
+ udev_enumerate_scan_devices(enumerate);
- udev->socket = socket(PF_UNIX, SOCK_DGRAM, 0);
- if (udev->socket < 0) {
- pb_log("Error creating udev socket: %s\n", strerror(errno));
+ list = udev_enumerate_get_list_entry(enumerate);
+
+ udev_list_entry_foreach(entry, list) {
+ const char *syspath;
+ struct udev_device *dev;
+
+ syspath = udev_list_entry_get_name(entry);
+ dev = udev_device_new_from_syspath(udev, syspath);
+
+ udev_handle_dev_action(dev, "add");
+
+ udev_device_unref(dev);
+ }
+
+ udev_enumerate_unref(enumerate);
+ return 0;
+
+fail:
+ udev_enumerate_unref(enumerate);
+ return -1;
+}
+
+static int udev_setup_monitor(struct udev *udev, struct udev_monitor **monitor)
+{
+ int result;
+ struct udev_monitor *m;
+
+ *monitor = NULL;
+ m = udev_monitor_new_from_netlink(udev, "udev");
+
+ if (!m) {
+ pb_log("udev_monitor_new_from_netlink failed\n");
goto out_err;
}
- talloc_set_destructor(udev, udev_destructor);
+ result = udev_monitor_set_receive_buffer_size(m, monitor_bufsize);
+ if (result) {
+ pb_log("udev_monitor_set_rx_bufsize(%d) failed\n",
+ monitor_bufsize);
+ }
- addr.sun_family = AF_UNIX;
- strcpy(addr.sun_path, PBOOT_DEVICE_SOCKET);
+ result = udev_monitor_filter_add_match_subsystem_devtype(m, "block",
+ NULL);
- if (bind(udev->socket, (struct sockaddr *)&addr, sizeof(addr))) {
- pb_log("Error binding udev socket: %s\n", strerror(errno));
+ if (result) {
+ pb_log("udev_monitor_filter_add_match_subsystem_devtype failed\n");
goto out_err;
}
- waiter_register(udev->socket, WAIT_IN, udev_process, udev);
+ result = udev_monitor_enable_receiving(m);
- return udev;
+ if (result) {
+ pb_log("udev_monitor_enable_receiving failed\n");
+ goto out_err;
+ }
+
+ *monitor = m;
+ return 0;
out_err:
+ udev_monitor_unref(m);
+ return -1;
+}
+
+/*
+ * udev_process - waiter callback for monitor netlink.
+ */
+
+static int udev_process(void *arg)
+{
+ struct udev_monitor *monitor = arg;
+ struct udev_device *dev;
+ const char *action;
+
+ dev = udev_monitor_receive_device(monitor);
+ if (!dev) {
+ pb_log("udev_monitor_receive_device failed\n");
+ return -1;
+ }
+
+ action = udev_device_get_action(dev);
+
+ if (!action) {
+ pb_log("udev_device_get_action failed\n");
+ } else {
+ udev_handle_dev_action(dev, action);
+ }
+
+ udev_device_unref(dev);
+ return 0;
+}
+
+static void udev_log_fn(struct udev __attribute__((unused)) *udev,
+ int __attribute__((unused)) priority, const char *file, int line,
+ const char *fn, const char *format, va_list args)
+{
+ pb_log("libudev: %s %s:%d: ", fn, file, line);
+ vfprintf(pb_log_get_stream(), format, args);
+}
+
+struct pb_udev *udev_init(struct device_handler *handler,
+ struct waitset *waitset)
+{
+ struct pb_udev *udev;
+ int result;
+
+ udev = talloc_zero(handler, struct pb_udev);
+ talloc_set_destructor(udev, udev_destructor);
+ udev->handler = handler;
+
+ udev->udev = udev_new();
+
+ if (!udev->udev) {
+ pb_log("udev_new failed\n");
+ goto fail;
+ }
+
+ udev_set_userdata(udev->udev, udev);
+
+ udev_set_log_fn(udev->udev, udev_log_fn);
+
+ result = udev_setup_monitor(udev->udev, &udev->monitor);
+ if (result)
+ goto fail;
+
+ result = udev_enumerate(udev->udev);
+ if (result)
+ goto fail;
+
+ waiter_register_io(waitset, udev_monitor_get_fd(udev->monitor), WAIT_IN,
+ udev_process, udev->monitor);
+
+ pb_debug("%s: waiting on udev\n", __func__);
+
+ return udev;
+
+fail:
talloc_free(udev);
return NULL;
}
-void udev_destroy(struct udev *udev)
+void udev_reinit(struct pb_udev *udev)
{
- talloc_free(udev);
+ pb_log("udev: reinit requested, starting enumeration\n");
+ udev_enumerate(udev->udev);
}
projects / petitboot / blobdiff