Integrate D-BUS support for use as IPC between parts.

Integrates DBUS with the event system so that it is asynchronous.

1 files changed, 210 insertions, 0 deletions

diff --git a/server/dbus/sssd_dbus_server.c b/server/dbus/sssd_dbus_server.c
new file mode 100644
index 00000000..288a3333
--- /dev/null
+++ b/server/dbus/sssd_dbus_server.c
@@ -0,0 +1,210 @@
+/*
+   SSSD
+
+   Service monitor - D-BUS features
+
+   Copyright (C) Stephen Gallagher         2008
+
+   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; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#include <sys/time.h>
+#include "dbus/dbus.h"
+#include "monitor.h"
+#include "dbus/sssd_dbus_common.h"
+#include "dbus/sssd_dbus_server.h"
+#include "dbus/sssd_dbus_client.h"
+#include "events.h"
+#include "util/util.h"
+
+/*
+ * integrate_server_with_event_loop
+ * Set up a D-BUS server to use the libevents mainloop
+ * for handling file descriptor and timed events
+ */
+int integrate_server_with_event_loop(struct event_context *event_ctx,
+        DBusServer *dbus_server,
+        void(*server_connection_setup)(DBusConnection *conn, struct event_context *)) {
+    struct dbus_server_toplevel_context *dt_ctx;
+    dt_ctx = talloc_zero(event_ctx, struct dbus_server_toplevel_context);
+    dt_ctx->ev = event_ctx;
+    dt_ctx->server = dbus_server;
+    dt_ctx->server_connection_setup = server_connection_setup;
+
+    /* Set up D-BUS new connection handler */
+    dbus_server_set_new_connection_function(dt_ctx->server,
+            new_connection_callback, dt_ctx, NULL);
+
+    /* Set up DBusWatch functions */
+    if (!dbus_server_set_watch_functions(dt_ctx->server, add_server_watch,
+            remove_watch, toggle_server_watch, dt_ctx, NULL)) {
+        DEBUG(0,("Error setting up D-BUS server watch functions"));
+        return -1;
+    }
+
+    /* Set up DBusTimeout functions */
+    if (!dbus_server_set_timeout_functions(dt_ctx->server, add_server_timeout,
+            remove_timeout, toggle_server_timeout, dt_ctx, NULL)) {
+        DEBUG(0,("Error setting up D-BUS server timeout functions"));
+        return -1;
+    }
+
+    return 0;
+}
+
+/*
+ * new_connection_callback
+ * Actions to be run upon each new client connection
+ * Must either perform dbus_connection_ref() on the
+ * new connection or else close the connection with
+ * dbus_connection_close()
+ */
+void new_connection_callback(DBusServer *server,
+        DBusConnection *new_connection, void *data) {
+
+    struct dbus_server_toplevel_context *dst_ctx;
+    dst_ctx = talloc_get_type(data,struct dbus_server_toplevel_context);
+
+    if(integrate_connection_with_event_loop(dst_ctx->ev,new_connection) != 0) {
+        dbus_connection_close(new_connection);
+        DEBUG(0,("Closing connection (failed setup)"));
+        return;
+    }
+    dbus_connection_ref(new_connection);
+
+    /* Run connection setup function */
+    DEBUG(3,("Got a connection\n"));
+    dst_ctx->server_connection_setup(new_connection, dst_ctx->ev);
+    DEBUG(3,("New connection set up.\n"));
+}
+
+/*
+ * add_server_watch
+ * Set up hooks into the libevents mainloop for
+ * D-BUS to add file descriptor-based events
+ */
+dbus_bool_t add_server_watch(DBusWatch *watch, void *data) {
+    unsigned int flags;
+    unsigned int event_flags;
+    struct dbus_server_toplevel_context *dt_ctx;
+    struct dbus_server_watch_context *svw_ctx;
+
+    if (!dbus_watch_get_enabled(watch)) {
+        return FALSE;
+    }
+
+    dt_ctx = talloc_get_type(data, struct dbus_server_toplevel_context);
+
+    svw_ctx = talloc_zero(dt_ctx, struct dbus_server_watch_context);
+    svw_ctx->top = dt_ctx;
+    svw_ctx->watch = watch;
+
+    flags = dbus_watch_get_flags(watch);
+    svw_ctx->fd = dbus_watch_get_unix_fd(watch);
+
+    event_flags = 0;
+
+    if (flags & DBUS_WATCH_READABLE) {
+        event_flags |= EVENT_FD_READ;
+    }
+
+    if (flags & DBUS_WATCH_WRITABLE) {
+        event_flags |= EVENT_FD_WRITE;
+    }
+    svw_ctx->fde = event_add_fd(svw_ctx->top->ev, svw_ctx, svw_ctx->fd,
+            event_flags, dbus_server_read_write_handler, svw_ctx);
+
+    /* Save the event to the watch object so it can be removed later */
+    dbus_watch_set_data(svw_ctx->watch,svw_ctx->fde,NULL);
+
+    return TRUE;
+}
+
+/*
+ * server_watch_toggled
+ * Hook for D-BUS to toggle the enabled/disabled state of
+ * an event in the mainloop
+ */
+void toggle_server_watch(DBusWatch *watch, void *data) {
+    if (dbus_watch_get_enabled(watch))
+        add_server_watch(watch, data);
+    else
+        remove_watch(watch, data);
+}
+
+/*
+ * add_server_timeout
+ * Hook for D-BUS to add time-based events to the mainloop
+ */
+dbus_bool_t add_server_timeout(DBusTimeout *timeout, void *data) {
+    struct dbus_server_toplevel_context *dt_ctx;
+    struct dbus_server_timeout_context *svt_ctx;
+    struct timeval tv;
+
+    if (!dbus_timeout_get_enabled(timeout))
+        return TRUE;
+
+    dt_ctx = talloc_get_type(data, struct dbus_server_toplevel_context);
+
+    svt_ctx = talloc_zero(dt_ctx,struct dbus_server_timeout_context);
+    svt_ctx->top = dt_ctx;
+    svt_ctx->timeout = timeout;
+
+    tv = _dbus_timeout_get_interval_tv(dbus_timeout_get_interval(timeout));
+
+    svt_ctx->te = event_add_timed(svt_ctx->top->ev, svt_ctx, tv,
+            dbus_server_timeout_handler, svt_ctx);
+
+    /* Save the event to the watch object so it can be removed later */
+    dbus_timeout_set_data(svt_ctx->timeout,svt_ctx->te,NULL);
+
+    return TRUE;
+}
+
+/*
+ * server_timeout_toggled
+ * Hook for D-BUS to toggle the enabled/disabled state of a mainloop
+ * event
+ */
+void toggle_server_timeout(DBusTimeout *timeout, void *data) {
+    if (dbus_timeout_get_enabled(timeout))
+        add_server_timeout(timeout, data);
+    else
+        remove_timeout(timeout, data);
+}
+
+/*
+ * dbus_server_read_write_handler
+ * Callback for D-BUS to handle messages on a file-descriptor
+ */
+void dbus_server_read_write_handler(struct event_context *ev, struct fd_event *fde,
+        uint16_t flags, void *ptr) {
+    struct dbus_server_watch_context *svw_ctx;
+    svw_ctx = talloc_get_type(ptr,struct dbus_server_watch_context);
+
+    dbus_server_ref(svw_ctx->top->server);
+    if (flags & EVENT_FD_READ) {
+        dbus_watch_handle(svw_ctx->watch, DBUS_WATCH_READABLE);
+    }
+    if (flags & EVENT_FD_WRITE) {
+        dbus_watch_handle(svw_ctx->watch, DBUS_WATCH_WRITABLE);
+    }
+    dbus_server_ref(svw_ctx->top->server);
+}
+
+void dbus_server_timeout_handler(struct event_context *ev, struct timed_event *te,
+        struct timeval t, void *data) {
+    struct dbus_server_timeout_context *svt_ctx;
+    svt_ctx = talloc_get_type(data, struct dbus_server_timeout_context);
+    dbus_timeout_handle(svt_ctx->timeout);
+}