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miraclecast/src/ctl/wfd-dbus.c
Derek Dai cb821562ed
relax permissions checking to let non-privileged use miracalcast.
we will enhance this by fine grained permission conrol latter.
2017-03-03 08:59:37 +08:00

701 lines
15 KiB
C

/*
* MiracleCast - Wifi-Display/Miracast Implementation
*
* Copyright (c) 2013-2014 David Herrmann <dh.herrmann@gmail.com>
*
* MiracleCast is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* MiracleCast 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with MiracleCast; If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <string.h>
#include <systemd/sd-bus.h>
#include "ctl.h"
#include "util.h"
#include "wfd-dbus.h"
#define wfd_dbus_object_added(o, argv...) ({ \
const char *ifaces[] = { argv }; \
_wfd_dbus_object_added(wfd_dbus_get(), \
(o), \
ifaces, \
SHL_ARRAY_LENGTH(ifaces)); \
})
#define wfd_dbus_object_removed(o, argv...) ({ \
const char *ifaces[] = { argv }; \
_wfd_dbus_object_removed(wfd_dbus_get(), \
(o), \
ifaces, \
SHL_ARRAY_LENGTH(ifaces)); \
})
struct wfd_dbus
{
sd_bus *bus;
sd_event *loop;
bool exposed : 1;
};
int wfd_dbus_new(struct wfd_dbus **out, sd_event *loop, sd_bus *bus)
{
struct wfd_dbus *wfd_dbus = calloc(1, sizeof(struct wfd_dbus));
if(!wfd_dbus) {
return -ENOMEM;
}
wfd_dbus->bus = sd_bus_ref(bus);
wfd_dbus->loop = sd_event_ref(loop);
*out = wfd_dbus;
return 0;
}
void wfd_dbus_free(struct wfd_dbus *wfd_dbus)
{
if(!wfd_dbus) {
return;
}
if(wfd_dbus->exposed) {
sd_bus_release_name(wfd_dbus->bus, "org.freedesktop.miracle.wfd");
}
if(wfd_dbus->bus) {
sd_bus_unref(wfd_dbus->bus);
}
if(wfd_dbus->loop) {
sd_event_unref(wfd_dbus->loop);
}
free(wfd_dbus);
}
static inline int wfd_dbus_get_sink_path(struct wfd_sink *s, char **out)
{
return sd_bus_path_encode("/org/freedesktop/miracle/wfd/sink",
wfd_sink_get_label(s),
out);
}
static inline int wfd_dbus_get_session_path(struct wfd_session *s, char **out)
{
char buf[64];
int r = snprintf(buf, sizeof(buf), "%" PRIu64, wfd_session_get_id(s));
if(0 > r) {
return r;
}
return sd_bus_path_encode("/org/freedesktop/miracle/wfd/session",
buf,
out);
}
static int wfd_dbus_enum(sd_bus *bus,
const char *path,
void *userdata,
char ***out,
sd_bus_error *out_error)
{
int r = 0, i = 0;
char **nodes, *node;
struct wfd_sink *sink;
struct wfd_session *session;
struct ctl_wfd *wfd = ctl_wfd_get();
if(strcmp("/org/freedesktop/miracle/wfd", path)) {
return 0;
}
if(!wfd->n_sinks) {
return 0;
}
nodes = malloc((wfd->n_sinks + wfd->n_sessions + 1) * sizeof(char *));
if(!nodes) {
return -ENOMEM;
}
ctl_wfd_foreach_sink(sink, wfd) {
r = wfd_dbus_get_sink_path(sink, &node);
if(0 > r) {
goto free_nodes;
}
nodes[i ++] = node;
}
ctl_wfd_foreach_session(session, wfd) {
r = wfd_dbus_get_session_path(session, &node);
if(0 > r) {
goto free_nodes;
}
nodes[i ++] = node;
}
nodes[i ++] = NULL;
*out = nodes;
return 0;
free_nodes:
while(i --) {
free(nodes[i]);
}
free(nodes);
return r;
}
int _wfd_dbus_object_removed(struct wfd_dbus *wfd_dbus,
const char *path,
const char **ifaces,
size_t n_ifaces)
{
int i, r;
_sd_bus_message_unref_ sd_bus_message *m = NULL;
if(!wfd_dbus) {
return -ECANCELED;
}
r = sd_bus_message_new_signal(wfd_dbus->bus,
&m,
"/org/freedesktop/miracle/wfd",
"org.freedesktop.DBus.ObjectManager",
"InterfaceRemoved");
if(0 > r) {
return r;
}
r = sd_bus_message_append(m, "o", path);
if(0 > r) {
return r;
}
r = sd_bus_message_open_container(m, 'a', "s");
if(0 > r) {
return r;
}
for(i = 0; i < n_ifaces; i ++) {
r = sd_bus_message_append(m, "s", ifaces[i]);
if(0 > r) {
return r;
}
}
r = sd_bus_message_close_container(m);
if(0 > r) {
return r;
}
return sd_bus_send(wfd_dbus->bus, m, NULL);
}
int _wfd_dbus_object_added(struct wfd_dbus *wfd_dbus,
const char *path,
const char **ifaces,
size_t n_ifaces)
{
int i, r;
_sd_bus_message_unref_ sd_bus_message *m = NULL;
if(!wfd_dbus) {
return -ECANCELED;
}
r = sd_bus_message_new_signal(wfd_dbus->bus,
&m,
"/org/freedesktop/miracle/wfd",
"org.freedesktop.DBus.ObjectManager",
"InterfaceAdded");
if(0 > r) {
return r;
}
r = sd_bus_message_append(m, "o", path);
if(0 > r) {
return r;
}
r = sd_bus_message_open_container(m, 'a', "{sa{sv}}");
if(0 > r) {
return r;
}
for(i = 0; i < n_ifaces; i ++) {
r = sd_bus_message_append(m, "{sa{sv}}", ifaces[i], 0);
if(0 > r) {
return r;
}
}
r = sd_bus_message_close_container(m);
if(0 > r) {
return r;
}
return sd_bus_send(wfd_dbus->bus, m, NULL);
}
int wfd_fn_sink_new(struct wfd_sink *s)
{
_shl_free_ char *path = NULL;
int r = sd_bus_path_encode("/org/freedesktop/miracle/wfd/sink",
wfd_sink_get_label(s),
&path);
if(0 > r) {
return r;
}
return wfd_dbus_object_added(path, "org.freedesktop.miracle.wfd.Sink");
}
int wfd_fn_sink_free(struct wfd_sink *s)
{
_shl_free_ char *path = NULL;
int r = sd_bus_path_encode("/org/freedesktop/miracle/wfd/sink",
wfd_sink_get_label(s),
&path);
if(0 > r) {
return r;
}
return wfd_dbus_object_added(path, "org.freedesktop.miracle.wfd.Sink");
}
int _wfd_fn_sink_properties_changed(struct wfd_sink *s, char **names)
{
_shl_free_ char *path = NULL;
int r;
struct wfd_dbus *wfd_dbus = wfd_dbus_get();
if(!wfd_dbus) {
return -ECANCELED;
}
r = wfd_dbus_get_sink_path(s, &path);
if(0 > r) {
return r;
}
return sd_bus_emit_properties_changed_strv(wfd_dbus->bus,
path,
"org.freedesktop.miracle.wfd.Sink",
names);
}
static int wfd_dbus_find_sink(sd_bus *bus,
const char *path,
const char *interface,
void *userdata,
void **ret_found,
sd_bus_error *ret_error)
{
_shl_free_ char *node = NULL;
struct wfd_sink *sink;
int r = sd_bus_path_decode(path,
"/org/freedesktop/miracle/wfd/sink",
&node);
if(0 >= r || !node) {
return r;
}
r = ctl_wfd_find_sink_by_label(ctl_wfd_get(), node, &sink);
if(r) {
*ret_found = sink;
}
return r;
}
int wfd_fn_session_new(struct wfd_session *s)
{
_shl_free_ char *path = NULL;
int r = wfd_dbus_get_session_path(s, &path);
if(0 > r) {
return r;
}
return wfd_dbus_object_added(path, "org.freedesktop.miracle.wfd.Session");
}
int wfd_fn_session_free(struct wfd_session *s)
{
_shl_free_ char *path = NULL;
int r = wfd_dbus_get_session_path(s, &path);
if(0 > r) {
return r;
}
return wfd_dbus_object_removed(path,
"org.freedesktop.miracle.wfd.Session");
}
static int wfd_dbus_find_session(sd_bus *bus,
const char *path,
const char *interface,
void *userdata,
void **ret_found,
sd_bus_error *ret_error)
{
struct wfd_session *s;
_shl_free_ char *node = NULL;
int r = sd_bus_path_decode(path,
"/org/freedesktop/miracle/wfd/session",
&node);
if(0 > r) {
return r;
}
r = ctl_wfd_find_session_by_id(ctl_wfd_get(),
strtoull(node, NULL, 10),
&s);
if(r) {
*ret_found = s;
}
return r;
}
static int wfd_dbus_sink_start_session(sd_bus_message *m,
void *userdata,
sd_bus_error *ret_error)
{
struct wfd_sink *sink = userdata;
_wfd_session_free_ struct wfd_session *session = NULL;
_shl_free_ char *path = NULL;
char *display = NULL;
uint16_t x, y, width, height;
int r;
r = sd_bus_message_read(m, "sqqqq", &display, &x, &y, &width, &height);
if(0 > r) {
return r;
}
r = wfd_sink_start_session(sink,
&session,
display,
x, y, width, height);
if(0 > r) {
return r;
}
r = wfd_dbus_get_session_path(session, &path);
if(0 > r) {
return r;
}
session = NULL;
return sd_bus_reply_method_return(m, "o", path);
}
//static int wfd_dbus_sink_get_audio_formats(sd_bus *bus,
// const char *path,
// const char *interface,
// const char *property,
// sd_bus_message *reply,
// void *userdata,
// sd_bus_error *ret_error)
//{
// return 0;
//}
//
//static int wfd_dbus_sink_get_video_formats(sd_bus *bus,
// const char *path,
// const char *interface,
// const char *property,
// sd_bus_message *reply,
// void *userdata,
// sd_bus_error *ret_error)
//{
// return 0;
//}
//
//static int wfd_dbus_sink_has_video(sd_bus *bus,
// const char *path,
// const char *interface,
// const char *property,
// sd_bus_message *reply,
// void *userdata,
// sd_bus_error *ret_error)
//{
// return 0;
//}
static int wfd_dbus_sink_get_session(sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *ret_error)
{
struct wfd_sink *s = userdata;
_shl_free_ char *session_path = NULL;
int r;
if(!s->session) {
return 0;
}
r = wfd_dbus_get_session_path(s->session, &session_path);
if(0 > r) {
return r;
}
return sd_bus_message_append(reply, "o", session_path);
}
static int wfd_dbus_sink_get_peer(sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *ret_error)
{
struct wfd_sink *s = userdata;
_shl_free_ char *peer_path = NULL;
int r = sd_bus_path_encode("/org/freedesktop/miracle/wifi/peer",
s->label,
&peer_path);
if(0 > r) {
return r;
}
return sd_bus_message_append(reply, "o", peer_path);
}
//static int wfd_dbus_sink_has_audio(sd_bus *bus,
// const char *path,
// const char *interface,
// const char *property,
// sd_bus_message *reply,
// void *userdata,
// sd_bus_error *ret_error)
//{
// return 0;
//}
static int wfd_dbus_session_resume(sd_bus_message *m,
void *userdata,
sd_bus_error *ret_error)
{
struct wfd_session *s = userdata;
int r;
if(wfd_session_is_established(s)) {
r = wfd_session_resume(s);
if(0 > r) {
return r;
}
}
else {
return -ENOTCONN;
}
return sd_bus_reply_method_return(m, NULL);
}
static int wfd_dbus_session_pause(sd_bus_message *m,
void *userdata,
sd_bus_error *ret_error)
{
struct wfd_session *s = userdata;
int r;
if(wfd_session_is_established(s)) {
r = wfd_session_pause(s);
if(0 > r) {
return r;
}
}
else {
return -ENOTCONN;
}
return sd_bus_reply_method_return(m, NULL);
}
static int wfd_dbus_session_teardown(sd_bus_message *m,
void *userdata,
sd_bus_error *ret_error)
{
struct wfd_session *s = userdata;
int r = wfd_session_teardown(s);
if(0 > r) {
return r;
}
return sd_bus_reply_method_return(m, NULL);
}
static int wfd_dbus_session_get_sink(sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *ret_error)
{
struct wfd_session *s = userdata;
_shl_free_ char *sink_path = NULL;
int r;
if(wfd_session_get_id(s) != WFD_SESSION_DIR_OUT) {
return 0;
}
r = wfd_dbus_get_sink_path(wfd_out_session_get_sink(s),
&sink_path);
if(0 > r) {
return r;
}
return sd_bus_message_append(reply, "o", sink_path);
}
static int wfd_dbus_get_session_presentation_url(sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *ret_error)
{
struct wfd_session *s = userdata;
return sd_bus_message_append(reply,
"s",
wfd_session_get_stream_url(s));
}
static int wfd_dbus_get_session_state(sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *ret_error)
{
struct wfd_session *s = userdata;
return sd_bus_message_append(reply, "i", wfd_session_get_state(s));
}
int _wfd_fn_session_properties_changed(struct wfd_session *s, char **names)
{
_shl_free_ char *path = NULL;
int r;
struct wfd_dbus *wfd_dbus = wfd_dbus_get();
if(!wfd_dbus) {
return -ECANCELED;
}
r = wfd_dbus_get_session_path(s, &path);
if(0 > r) {
return r;
}
return sd_bus_emit_properties_changed_strv(wfd_dbus_get()->bus,
path,
"org.freedesktop.miracle.wfd.Session",
names);
}
static const sd_bus_vtable wfd_dbus_vtable[] = {
SD_BUS_VTABLE_START(0),
SD_BUS_VTABLE_END,
};
static const sd_bus_vtable wfd_dbus_sink_vtable[] = {
SD_BUS_VTABLE_START(0),
SD_BUS_METHOD("StartSession", "sqqqq", "o", wfd_dbus_sink_start_session, SD_BUS_VTABLE_UNPRIVILEGED),
/*SD_BUS_PROPERTY("AudioFormats", "a{sv}", wfd_dbus_sink_get_audio_formats, 0, SD_BUS_VTABLE_PROPERTY_CONST),*/
/*SD_BUS_PROPERTY("VideoFormats", "a{sv}", wfd_dbus_sink_get_video_formats, 0, SD_BUS_VTABLE_PROPERTY_CONST),*/
/*SD_BUS_PROPERTY("HasAudio", "b", wfd_dbus_sink_has_audio, 0, SD_BUS_VTABLE_PROPERTY_CONST),*/
/*SD_BUS_PROPERTY("HasVideo", "b", wfd_dbus_sink_has_video, 0, SD_BUS_VTABLE_PROPERTY_CONST),*/
SD_BUS_PROPERTY("Session", "o", wfd_dbus_sink_get_session, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
SD_BUS_PROPERTY("Peer", "o", wfd_dbus_sink_get_peer, 0, SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_VTABLE_END,
};
static const sd_bus_vtable wfd_dbus_session_vtable[] = {
SD_BUS_VTABLE_START(0),
SD_BUS_METHOD("Resume", NULL, NULL, wfd_dbus_session_resume, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("Pause", NULL, NULL, wfd_dbus_session_pause, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("Teardown", NULL, NULL, wfd_dbus_session_teardown, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_PROPERTY("Sink", "o", wfd_dbus_session_get_sink, 0, SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("Url", "o", wfd_dbus_get_session_presentation_url, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
SD_BUS_PROPERTY("State", "i", wfd_dbus_get_session_state, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
SD_BUS_VTABLE_END,
};
int wfd_dbus_expose(struct wfd_dbus *wfd_dbus)
{
int r = sd_bus_add_object_vtable(wfd_dbus->bus,
NULL,
"/org/freedesktop/miracle/wfd",
"org.freedesktop.miracle.wfd.Display",
wfd_dbus_vtable,
wfd_dbus);
if(0 > r) {
return r;
}
r = sd_bus_add_fallback_vtable(wfd_dbus->bus,
NULL,
"/org/freedesktop/miracle/wfd/sink",
"org.freedesktop.miracle.wfd.Sink",
wfd_dbus_sink_vtable,
wfd_dbus_find_sink,
wfd_dbus);
if(0 > r) {
return r;
}
r = sd_bus_add_fallback_vtable(wfd_dbus->bus,
NULL,
"/org/freedesktop/miracle/wfd/session",
"org.freedesktop.miracle.wfd.Session",
wfd_dbus_session_vtable,
wfd_dbus_find_session,
wfd_dbus);
if(0 > r) {
return r;
}
r = sd_bus_add_node_enumerator(wfd_dbus->bus,
NULL,
"/org/freedesktop/miracle/wfd",
wfd_dbus_enum,
wfd_dbus);
if(0 > r) {
return r;
}
r = sd_bus_add_object_manager(wfd_dbus->bus, NULL, "/org/freedesktop/miracle/wfd");
if(0 > r) {
return r;
}
r = sd_bus_request_name(wfd_dbus->bus, "org.freedesktop.miracle.wfd", 0);
if(0 < r) {
wfd_dbus->exposed = true;
}
return r;
}