3 files changed, 264 insertions, 0 deletions
diff --git a/extras/dbus/Makefile b/extras/dbus/Makefile
new file mode 100644
index 0000000000..99aa33d8fb
--- /dev/null
+++ b/extras/dbus/Makefile
@@ -0,0 +1,63 @@
+# Makefile for udev_dbus
+#
+# Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 2 of the License.
+#
+
+# Set the following to `true' to log the debug
+# and make a unstripped, unoptimized  binary.
+# Leave this set to `false' for production use.
+DEBUG = false
+
+PROG = 	udev_dbus
+
+all:	$(PROG)
+
+# override this to make udev look in a different location for it's config files
+prefix =
+exec_prefix =	${prefix}
+etcdir =	${prefix}/etc
+sbindir =	${exec_prefix}/sbin
+usrbindir =	${exec_prefix}/usr/bin
+mandir =	${prefix}/usr/share/man
+hotplugdir =	${etcdir}/hotplug.d/default
+dbusdir =	${etcdir}/dbus-1/system.d
+configdir =	${etcdir}/udev/
+initdir = 	${etcdir}/init.d/
+srcdir = .
+
+INSTALL = /usr/bin/install -c
+INSTALL_PROGRAM = ${INSTALL}
+INSTALL_DATA  = ${INSTALL} -m 644
+INSTALL_SCRIPT = ${INSTALL_PROGRAM}
+
+override CFLAGS+=-Wall -fno-builtin
+
+override CFLAGS += -DUSE_DBUS
+override CFLAGS += $(shell pkg-config --cflags dbus-1)
+override LDFLAGS += $(shell pkg-config --libs dbus-1)
+OBJS = udev_dbus.o
+
+$(PROG): $(OBJS)
+	$(LD) $(LDFLAGS) -o $(PROG) $(CRT0) $(OBJS) ../../udev_lib.o $(LIB_OBJS) $(ARCH_LIB_OBJS)
+
+clean:
+	rm -f $(PROG) $(OBJS)
+
+spotless: clean
+
+
+install-dbus-policy:
+	$(INSTALL) -d $(DESTDIR)$(dbusdir)
+	$(INSTALL_DATA) etc/dbus-1/system.d/udev_sysbus_policy.conf $(DESTDIR)$(dbusdir)
+
+uninstall-dbus-policy:
+	- rm $(DESTDIR)$(dbusdir)/udev_sysbus_policy.conf
+
+install: install-dbus-policy all
+
+uninstall: uninstall-dbus-policy
+
diff --git a/extras/dbus/etc/dbus-1/system.d/udev_sysbus_policy.conf b/extras/dbus/etc/dbus-1/system.d/udev_sysbus_policy.conf
new file mode 100644
index 0000000000..b2660e65cf
--- /dev/null
+++ b/extras/dbus/etc/dbus-1/system.d/udev_sysbus_policy.conf
@@ -0,0 +1,23 @@
+<!DOCTYPE busconfig PUBLIC
+ "-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN"
+ "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
+<busconfig>
+
+  <!-- This configuration file specifies the required security policies
+       for udev to work. -->
+
+  <!-- Only root can own the udev service and only root can use the
+       org.kernel.udev.NodeMonitor interface to send signals -->
+  <policy user="root">
+    <allow own="org.kernel.udev"/>
+
+    <allow send_interface="org.kernel.udev.NodeMonitor"/>
+  </policy>
+
+  <!-- Allow anyone to listen to the org.kernel.udev.NodeMonitor interface 
+       for messages send from the owner of the org.kernel.udev service -->
+  <policy context="default">
+    <allow receive_interface="org.kernel.udev.NodeMonitor"/>
+  </policy>
+</busconfig>
+
diff --git a/extras/dbus/udev_dbus.c b/extras/dbus/udev_dbus.c
new file mode 100644
index 0000000000..955a3dbb49
--- /dev/null
+++ b/extras/dbus/udev_dbus.c
@@ -0,0 +1,178 @@
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+#include <ctype.h>
+
+#define DBUS_API_SUBJECT_TO_CHANGE
+#include <dbus/dbus.h>
+
+#include "../../udev_lib.h"
+#include "../../logging.h"
+
+#ifdef LOG
+unsigned char logname[LOGNAME_SIZE];
+void log_message(int level, const char *format, ...)
+{
+	va_list args;
+
+	if (!udev_log)
+		return;
+
+	va_start(args, format);
+	vsyslog(level, format, args);
+	va_end(args);
+}
+#endif
+
+/** variable for the connection the to system message bus or #NULL
+ *  if we cannot connect or acquire the org.kernel.udev service
+ */
+static DBusConnection* sysbus_connection;
+
+/** Disconnect from the system message bus */
+static void sysbus_disconnect(void)
+{
+	if (sysbus_connection == NULL)
+		return;
+
+	dbus_connection_disconnect(sysbus_connection);
+	sysbus_connection = NULL;
+}
+
+/** Connect to the system message bus */
+static void sysbus_connect(void)
+{
+	DBusError error;
+
+	/* Connect to a well-known bus instance, the system bus */
+	dbus_error_init(&error);
+	sysbus_connection = dbus_bus_get(DBUS_BUS_SYSTEM, &error);
+	if (sysbus_connection == NULL) {
+		dbg("cannot connect to system message bus, error %s: %s", 
+		    error.name, error.message);
+		dbus_error_free(&error);
+		return;
+	}
+
+	/*  Acquire the org.kernel.udev service such that listeners
+	 *  know that the message is really from us and not from a
+	 *  random attacker. See the file udev_sysbus_policy.conf for
+	 *  details.
+	 *
+	 *  Note that a service can have multiple owners (though there
+	 *  is a concept of a primary owner for reception of messages)
+	 *  so no race is introduced if two copies of udev is running
+	 *  at the same time.
+	 */
+	dbus_bus_acquire_service(sysbus_connection, "org.kernel.udev", 0, 
+				 &error);
+	if (dbus_error_is_set(&error)) {
+		printf("cannot acquire org.kernel.udev service, error %s: %s'",
+		       error.name, error.message);
+		sysbus_disconnect();
+		return;
+	}
+}
+
+
+/** Send out a signal that a device node is created
+ *
+ *  @param  devnode             name of the device node, e.g. /dev/sda1
+ *  @param  path                Sysfs path of device
+ */
+static void sysbus_send_create(const char *devnode, const char *path)
+{
+	DBusMessage* message;
+	DBusMessageIter iter;
+
+	/* object, interface, member */
+	message = dbus_message_new_signal("/org/kernel/udev/NodeMonitor", 
+					  "org.kernel.udev.NodeMonitor",
+					  "NodeCreated");
+
+	dbus_message_iter_init(message, &iter);
+	dbus_message_iter_append_string(&iter, devnode);
+	dbus_message_iter_append_string(&iter, path);
+
+	if ( !dbus_connection_send(sysbus_connection, message, NULL) )
+		dbg("error sending d-bus signal");
+
+	dbus_message_unref(message);
+
+	dbus_connection_flush(sysbus_connection);
+}
+
+/** Send out a signal that a device node is deleted
+ *
+ *  @param  devnode             Name of the device node, e.g. /udev/sda1
+ *  @param  path                Sysfs path of device
+ */
+static void sysbus_send_remove(const char *devnode, const char *path)
+{
+	DBusMessage* message;
+	DBusMessageIter iter;
+
+	/* object, interface, member */
+	message = dbus_message_new_signal("/org/kernel/udev/NodeMonitor", 
+					  "org.kernel.udev.NodeMonitor",
+					  "NodeDeleted");
+
+	dbus_message_iter_init(message, &iter);
+	dbus_message_iter_append_string(&iter, devnode);
+	dbus_message_iter_append_string(&iter, path);
+
+	if ( !dbus_connection_send(sysbus_connection, message, NULL) )
+		dbg("error sending d-bus signal");
+
+	dbus_message_unref(message);
+
+	dbus_connection_flush(sysbus_connection);
+}
+
+int main(int argc, char *argv[], char *envp[])
+{
+	char *action;
+	char *devpath;
+	char *devnode;
+	int retval = 0;
+
+	init_logging("udev_dbus");
+
+	sysbus_connect();
+	if (sysbus_connection == NULL)
+		return 0;
+
+	action = get_action();
+	if (!action) {
+		dbg("no action?");
+		goto exit;
+	}
+	devpath = get_devpath();
+	if (!devpath) {
+		dbg("no devpath?");
+		goto exit;
+	}
+	devnode = get_devnode();
+	if (!devnode) {
+		dbg("no devnode?");
+		goto exit;
+	}
+
+	if (strcmp(action, "add") == 0) {
+		sysbus_send_create(devnode, devpath);
+	} else {
+		if (strcmp(action, "remove") == 0) {
+			sysbus_send_remove(devnode, devpath);
+		} else {
+			dbg("unknown action '%s'", action);
+			retval = -EINVAL;
+		}
+	}
+
+exit:
+	sysbus_disconnect();
+	return retval;
+}