summaryrefslogtreecommitdiff
path: root/extras
diff options
context:
space:
mode:
Diffstat (limited to 'extras')
-rw-r--r--extras/dbus/Makefile63
-rw-r--r--extras/dbus/etc/dbus-1/system.d/udev_sysbus_policy.conf23
-rw-r--r--extras/dbus/udev_dbus.c178
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;
+}