sssd_dbus_common.c revision 83bf46f4066e3d5e838a32357c201de9bd6ecdfd
/*
Authors:
Simo Sorce <ssorce@redhat.com>
Stephen Gallagher <sgallagh@redhat.com>
Copyright (C) 2009 Red Hat
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 <tevent.h>
#include <dbus/dbus.h>
#include "util/util.h"
#include "sbus/sssd_dbus.h"
#include "sbus/sssd_dbus_private.h"
/* =Watches=============================================================== */
/* DBUS may ask us to add a watch to a file descriptor that already had a watch
* associated. Need to check if that's the case */
static struct sbus_watch_ctx *fd_to_watch(struct sbus_watch_ctx *list, int fd)
{
struct sbus_watch_ctx *watch_iter;
watch_iter = list;
while (watch_iter != NULL) {
if (watch_iter->fd == fd) {
return watch_iter;
}
watch_iter = watch_iter->next;
}
return NULL;
}
static int watch_destructor(void *mem)
{
struct sbus_watch_ctx *watch;
watch = talloc_get_type(mem, struct sbus_watch_ctx);
DLIST_REMOVE(watch->conn->watch_list, watch);
return 0;
}
/*
* watch_handler
* Callback for D-BUS to handle messages on a file-descriptor
*/
static void sbus_watch_handler(struct tevent_context *ev,
struct tevent_fd *fde,
uint16_t flags, void *data)
{
struct sbus_watch_ctx *watch = talloc_get_type(data,
struct sbus_watch_ctx);
enum dbus_conn_type type;
union dbus_conn_pointer dbus_p;
/* conn may get freed inside a handle, save the data we need for later */
type = watch->conn->type;
dbus_p = watch->conn->dbus;
/* Take a reference while handling watch */
if (type == SBUS_SERVER) {
dbus_server_ref(dbus_p.server);
} else {
dbus_connection_ref(dbus_p.conn);
}
/* Fire if readable */
if (flags & TEVENT_FD_READ) {
if (watch->dbus_read_watch) {
dbus_watch_handle(watch->dbus_read_watch, DBUS_WATCH_READABLE);
}
}
/* Fire if writeable */
if (flags & TEVENT_FD_WRITE) {
if (watch->dbus_write_watch) {
dbus_watch_handle(watch->dbus_write_watch, DBUS_WATCH_WRITABLE);
}
}
/* Release reference once done */
if (type == SBUS_SERVER) {
dbus_server_unref(dbus_p.server);
} else {
dbus_connection_unref(dbus_p.conn);
}
}
/*
* add_watch
* Set up hooks into the libevents mainloop for
* D-BUS to add file descriptor-based events
*/
dbus_bool_t sbus_add_watch(DBusWatch *dbus_watch, void *data)
{
unsigned int flags;
uint16_t event_flags;
struct sbus_connection *conn;
struct sbus_watch_ctx *watch;
dbus_bool_t enabled;
int fd;
conn = talloc_get_type(data, struct sbus_connection);
#ifdef HAVE_DBUS_WATCH_GET_UNIX_FD
fd = dbus_watch_get_unix_fd(dbus_watch);
#else
fd = dbus_watch_get_fd(dbus_watch);
#endif
watch = fd_to_watch(conn->watch_list, fd);
if (!watch) {
/* does not exist, allocate new one */
watch = talloc_zero(conn, struct sbus_watch_ctx);
if (!watch) {
DEBUG(SSSDBG_FATAL_FAILURE, "Out of Memory!\n");
return FALSE;
}
watch->conn = conn;
watch->fd = fd;
}
enabled = dbus_watch_get_enabled(dbus_watch);
flags = dbus_watch_get_flags(dbus_watch);
/* Save the event to the watch object so it can be found later */
if (flags & DBUS_WATCH_READABLE) {
watch->dbus_read_watch = dbus_watch;
}
if (flags & DBUS_WATCH_WRITABLE) {
watch->dbus_write_watch = dbus_watch;
}
dbus_watch_set_data(dbus_watch, watch, NULL);
if (watch->fde) {
/* pre-existing event, just toggle flags */
sbus_toggle_watch(dbus_watch, data);
return TRUE;
}
event_flags = 0;
if (enabled) {
if (flags & DBUS_WATCH_READABLE) {
event_flags |= TEVENT_FD_READ;
}
if (flags & DBUS_WATCH_WRITABLE) {
event_flags |= TEVENT_FD_WRITE;
}
}
/* Add the file descriptor to the event loop */
watch->fde = tevent_add_fd(conn->ev,
watch, fd, event_flags,
sbus_watch_handler, watch);
if (!watch->fde) {
DEBUG(SSSDBG_FATAL_FAILURE, "Failed to set up fd event!\n");
talloc_zfree(watch);
return FALSE;
}
DLIST_ADD(conn->watch_list, watch);
talloc_set_destructor((TALLOC_CTX *)watch, watch_destructor);
DEBUG(SSSDBG_TRACE_INTERNAL, "%p/%p (%d), %s/%s (%s)\n",
watch, dbus_watch, fd,
((flags & DBUS_WATCH_READABLE)?"R":"-"),
((flags & DBUS_WATCH_WRITABLE)?"W":"-"),
enabled?"enabled":"disabled");
return TRUE;
}
/*
* toggle_watch
* Hook for D-BUS to toggle the enabled/disabled state of
* an event in the mainloop
*/
void sbus_toggle_watch(DBusWatch *dbus_watch, void *data)
{
struct sbus_watch_ctx *watch;
unsigned int flags;
dbus_bool_t enabled;
void *watch_data;
int fd = -1;
enabled = dbus_watch_get_enabled(dbus_watch);
flags = dbus_watch_get_flags(dbus_watch);
watch_data = dbus_watch_get_data(dbus_watch);
watch = talloc_get_type(watch_data, struct sbus_watch_ctx);
if (!watch) {
DEBUG(SSSDBG_OP_FAILURE,
"[%p] does not carry watch context?!\n", dbus_watch);
/* abort ? */
return;
}
if (enabled) {
if (flags & DBUS_WATCH_READABLE) {
TEVENT_FD_READABLE(watch->fde);
}
if (flags & DBUS_WATCH_WRITABLE) {
TEVENT_FD_WRITEABLE(watch->fde);
}
} else {
if (flags & DBUS_WATCH_READABLE) {
TEVENT_FD_NOT_READABLE(watch->fde);
}
if (flags & DBUS_WATCH_WRITABLE) {
TEVENT_FD_NOT_WRITEABLE(watch->fde);
}
}
if (DEBUG_IS_SET(SSSDBG_TRACE_ALL)) {
#ifdef HAVE_DBUS_WATCH_GET_UNIX_FD
fd = dbus_watch_get_unix_fd(dbus_watch);
#else
fd = dbus_watch_get_fd(dbus_watch);
#endif
}
DEBUG(SSSDBG_TRACE_ALL,
"%p/%p (%d), %s/%s (%s)\n",
watch, dbus_watch, fd,
((flags & DBUS_WATCH_READABLE)?"R":"-"),
((flags & DBUS_WATCH_WRITABLE)?"W":"-"),
enabled?"enabled":"disabled");
}
/*
* sbus_remove_watch
* Hook for D-BUS to remove file descriptor-based events
* from the libevents mainloop
*/
void sbus_remove_watch(DBusWatch *dbus_watch, void *data)
{
struct sbus_watch_ctx *watch;
void *watch_data;
watch_data = dbus_watch_get_data(dbus_watch);
watch = talloc_get_type(watch_data, struct sbus_watch_ctx);
DEBUG(SSSDBG_TRACE_INTERNAL, "%p/%p\n", watch, dbus_watch);
if (!watch) {
DEBUG(SSSDBG_OP_FAILURE, "DBUS trying to remove unknown watch!\n");
return;
}
/* remove dbus watch data */
dbus_watch_set_data(dbus_watch, NULL, NULL);
/* check which watch to remove, or free if none left */
if (watch->dbus_read_watch == dbus_watch) {
watch->dbus_read_watch = NULL;
}
if (watch->dbus_write_watch == dbus_watch) {
watch->dbus_write_watch = NULL;
}
if (!watch->dbus_read_watch && !watch->dbus_write_watch) {
talloc_free(watch);
}
}
/* =Timeouts============================================================== */
static struct timeval _get_interval_tv(int interval) {
struct timeval tv;
struct timeval rightnow;
gettimeofday(&rightnow,NULL);
tv.tv_sec = interval / 1000 + rightnow.tv_sec;
tv.tv_usec = (interval % 1000) * 1000 + rightnow.tv_usec;
return tv;
}
/*
* timeout_handler
* Callback for D-BUS to handle timed events
*/
static void sbus_timeout_handler(struct tevent_context *ev,
struct tevent_timer *te,
struct timeval t, void *data)
{
struct sbus_timeout_ctx *timeout;
timeout = talloc_get_type(data, struct sbus_timeout_ctx);
dbus_timeout_handle(timeout->dbus_timeout);
}
/*
* add_timeout
* Hook for D-BUS to add time-based events to the mainloop
*/
dbus_bool_t sbus_add_timeout(DBusTimeout *dbus_timeout, void *data)
{
struct sbus_connection *conn;
struct sbus_timeout_ctx *timeout;
struct timeval tv;
DEBUG(SSSDBG_TRACE_INTERNAL, "%p\n", dbus_timeout);
if (!dbus_timeout_get_enabled(dbus_timeout)) {
return TRUE;
}
conn = talloc_get_type(data, struct sbus_connection);
timeout = talloc_zero(conn, struct sbus_timeout_ctx);
if (!timeout) {
DEBUG(SSSDBG_FATAL_FAILURE, "Out of Memory!\n");
return FALSE;
}
timeout->dbus_timeout = dbus_timeout;
tv = _get_interval_tv(dbus_timeout_get_interval(dbus_timeout));
timeout->te = tevent_add_timer(conn->ev, timeout, tv,
sbus_timeout_handler, timeout);
if (!timeout->te) {
DEBUG(SSSDBG_FATAL_FAILURE, "Failed to set up timeout event!\n");
return FALSE;
}
/* Save the event to the watch object so it can be removed later */
dbus_timeout_set_data(timeout->dbus_timeout, timeout, NULL);
return TRUE;
}
/*
* sbus_toggle_timeout
* Hook for D-BUS to toggle the enabled/disabled state of a mainloop
* event
*/
void sbus_toggle_timeout(DBusTimeout *dbus_timeout, void *data)
{
DEBUG(SSSDBG_TRACE_INTERNAL, "%p\n", dbus_timeout);
if (dbus_timeout_get_enabled(dbus_timeout)) {
sbus_add_timeout(dbus_timeout, data);
} else {
sbus_remove_timeout(dbus_timeout, data);
}
}
/*
* sbus_remove_timeout
* Hook for D-BUS to remove time-based events from the mainloop
*/
void sbus_remove_timeout(DBusTimeout *dbus_timeout, void *data)
{
void *timeout;
DEBUG(SSSDBG_TRACE_INTERNAL, "%p\n", dbus_timeout);
timeout = dbus_timeout_get_data(dbus_timeout);
/* remove dbus timeout data */
dbus_timeout_set_data(dbus_timeout, NULL, NULL);
/* Freeing the event object will remove it from the event loop */
talloc_free(timeout);
}