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|
#if defined(HAVE_CONFIG_H)
#include "config.h"
#endif
#include <assert.h>
#include <errno.h>
#include <libudev.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.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 "pb-discover.h"
#include "device-handler.h"
#include "cdrom.h"
struct pb_udev {
struct udev *udev;
struct udev_monitor *monitor;
struct device_handler *handler;
};
static int udev_destructor(void *p)
{
struct pb_udev *udev = p;
udev_monitor_unref(udev->monitor);
udev->monitor = NULL;
udev_unref(udev->udev);
udev->udev = NULL;
return 0;
}
static void udev_setup_device_params(struct udev_device *udev,
struct discover_device *dev)
{
struct udev_list_entry *list, *entry;
list = udev_device_get_properties_list_entry(udev);
if (!list)
return;
udev_list_entry_foreach(entry, list)
discover_device_set_param(dev,
udev_list_entry_get_name(entry),
udev_list_entry_get_value(entry));
}
static int udev_handle_block_add(struct pb_udev *udev, struct udev_device *dev,
const char *name)
{
struct discover_device *ddev;
const char *typestr;
const char *uuid;
const char *path;
const char *node;
const char *prop;
const char *type;
bool cdrom;
typestr = udev_device_get_devtype(dev);
if (!typestr) {
pb_debug("udev_device_get_devtype failed\n");
return -1;
}
if (!(!strcmp(typestr, "disk") || !strcmp(typestr, "partition"))) {
pb_debug("SKIP %s: invalid type %s\n", name, typestr);
return 0;
}
node = udev_device_get_devnode(dev);
path = udev_device_get_devpath(dev);
if (path && (strstr(path, "virtual/block/loop")
|| strstr(path, "virtual/block/ram"))) {
pb_debug("SKIP: %s: ignored (path=%s)\n", name, path);
return 0;
}
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_debug("SKIP: %s: no media present\n", name);
return 0;
}
}
type = udev_device_get_property_value(dev, "ID_FS_TYPE");
if (!type) {
pb_debug("SKIP: %s: no ID_FS_TYPE property\n", name);
return 0;
}
/* 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 -1;
}
}
ddev = discover_device_create(udev->handler, name);
ddev->device_path = talloc_strdup(ddev, node);
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);
ddev->device->type = cdrom ? DEVICE_TYPE_OPTICAL : DEVICE_TYPE_DISK;
udev_setup_device_params(dev, ddev);
device_handler_discover(udev->handler, ddev);
return 0;
}
static int udev_handle_dev_add(struct pb_udev *udev, struct udev_device *dev)
{
const char *subsys;
const char *name;
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 (device_lookup_by_id(udev->handler, name)) {
pb_debug("device %s is already present?\n", name);
return -1;
}
if (!strcmp(subsys, "block")) {
return udev_handle_block_add(udev, dev, name);
}
pb_debug("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;
device_handler_remove(udev->handler, ddev);
return 0;
}
/* 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;
node = udev_device_get_devnode(dev);
/* handle CDROM eject requests */
if (udev_device_get_property_value(dev, "DISK_EJECT_REQUEST")) {
bool eject = false;
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);
return false;
}
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 pb_udev *udev = udev_get_userdata(udev_device_get_udev(dev));
#ifdef DEBUG
{
struct udev_list_entry *list;
const char *name;
list = udev_device_get_properties_list_entry(dev);
name = udev_device_get_sysname(dev);
pb_debug("%s: action %s, device %s\n", __func__, action, name);
pb_debug("%s properties:\n", __func__);
for (; list; list = udev_list_entry_get_next(list))
pb_log("\t%-20s: %s\n", udev_list_entry_get_name(list),
udev_list_entry_get_value(list));
} while (0);
#endif
if (!strcmp(action, "add"))
return udev_handle_dev_add(udev, dev);
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;
}
static int udev_enumerate(struct udev *udev)
{
int result;
struct udev_list_entry *list, *entry;
struct udev_enumerate *enumerate;
enumerate = udev_enumerate_new(udev);
if (!enumerate) {
pb_log("udev_enumerate_new failed\n");
return -1;
}
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);
list = udev_enumerate_get_list_entry(enumerate);
if (!list) {
pb_log("udev_enumerate_get_list_entry failed\n");
goto fail;
}
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;
}
result = udev_monitor_filter_add_match_subsystem_devtype(m, "block",
NULL);
if (result) {
pb_log("udev_monitor_filter_add_match_subsystem_devtype failed\n");
goto out_err;
}
result = udev_monitor_enable_receiving(m);
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;
int result;
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");
goto fail;
}
result = udev_handle_dev_action(dev, action);
udev_device_unref(dev);
return result;
fail:
udev_device_unref(dev);
return -1;
}
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 waitset *waitset,
struct device_handler *handler)
{
int result;
struct pb_udev *udev = talloc(NULL, 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_new;
}
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_monitor;
result = udev_enumerate(udev->udev);
if (result)
goto fail_enumerate;
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_monitor:
udev_monitor_unref(udev->monitor);
fail_enumerate:
udev_unref(udev->udev);
fail_new:
talloc_free(udev);
return NULL;
}
void udev_destroy(struct pb_udev *udev)
{
talloc_free(udev);
}
|