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https://github.com/systemd/systemd-stable.git
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135 lines
3.5 KiB
C
135 lines
3.5 KiB
C
#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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#include <ctype.h>
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#define DBUS_API_SUBJECT_TO_CHANGE
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#include <dbus/dbus.h>
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#include "udev.h"
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#include "udev_version.h"
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#include "udev_dbus.h"
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/** variable for the connection the to system message bus or #NULL
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* if we cannot connect or acquire the org.kernel.udev service
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*/
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static DBusConnection* sysbus_connection;
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/** Disconnect from the system message bus */
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void sysbus_disconnect(void)
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{
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if (sysbus_connection == NULL)
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return;
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dbus_connection_disconnect(sysbus_connection);
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sysbus_connection = NULL;
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}
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/** Connect to the system message bus */
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void sysbus_connect(void)
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{
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DBusError error;
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/* Connect to a well-known bus instance, the system bus */
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dbus_error_init(&error);
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sysbus_connection = dbus_bus_get(DBUS_BUS_SYSTEM, &error);
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if (sysbus_connection == NULL) {
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dbg("cannot connect to system message bus, error %s: %s",
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error.name, error.message);
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dbus_error_free(&error);
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return;
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}
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/* Acquire the org.kernel.udev service such that listeners
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* know that the message is really from us and not from a
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* random attacker. See the file udev_sysbus_policy.conf for
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* details.
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*
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* Note that a service can have multiple owners (though there
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* is a concept of a primary owner for reception of messages)
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* so no race is introduced if two copies of udev is running
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* at the same time.
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*/
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dbus_bus_acquire_service(sysbus_connection, "org.kernel.udev", 0,
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&error);
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if (dbus_error_is_set(&error)) {
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printf("cannot acquire org.kernel.udev service, error %s: %s'",
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error.name, error.message);
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sysbus_disconnect();
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return;
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}
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}
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/** Send out a signal that a device node is created
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*
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* @param dev udevice object
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* @param path Sysfs path of device
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*/
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void sysbus_send_create(struct udevice *dev, const char *path)
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{
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char filename[255];
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DBusMessage* message;
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DBusMessageIter iter;
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if (sysbus_connection == NULL)
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return;
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strncpy(filename, udev_root, sizeof(filename));
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strncat(filename, dev->name, sizeof(filename));
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/* object, interface, member */
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message = dbus_message_new_signal("/org/kernel/udev/NodeMonitor",
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"org.kernel.udev.NodeMonitor",
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"NodeCreated");
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dbus_message_iter_init(message, &iter);
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dbus_message_iter_append_string(&iter, filename);
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dbus_message_iter_append_string(&iter, path);
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if ( !dbus_connection_send(sysbus_connection, message, NULL) )
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dbg("error sending d-bus signal");
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dbus_message_unref(message);
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dbus_connection_flush(sysbus_connection);
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}
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/** Send out a signal that a device node is deleted
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*
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* @param name Name of the device node, e.g. /udev/sda1
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* @param path Sysfs path of device
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*/
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void sysbus_send_remove(const char* name, const char *path)
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{
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char filename[255];
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DBusMessage* message;
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DBusMessageIter iter;
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if (sysbus_connection == NULL)
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return;
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strncpy(filename, udev_root, sizeof(filename));
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strncat(filename, name, sizeof(filename));
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/* object, interface, member */
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message = dbus_message_new_signal("/org/kernel/udev/NodeMonitor",
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"org.kernel.udev.NodeMonitor",
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"NodeDeleted");
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dbus_message_iter_init(message, &iter);
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dbus_message_iter_append_string(&iter, filename);
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dbus_message_iter_append_string(&iter, path);
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if ( !dbus_connection_send(sysbus_connection, message, NULL) )
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dbg("error sending d-bus signal");
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dbus_message_unref(message);
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dbus_connection_flush(sysbus_connection);
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}
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