[Libva] [PATCH 5/7] drm: allow authentication through X11 server.
Gwenole Beauchesne
gb.devel at gmail.com
Tue Jul 3 07:31:28 PDT 2012
Make it possible to authenticate a DRM connection through an X server
that may already be running.
Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne at intel.com>
---
va/drm/Makefile.am | 6 ++
va/drm/va_drm_auth.c | 8 ++-
va/drm/va_drm_auth_x11.c | 172 ++++++++++++++++++++++++++++++++++++++++++++++
va/drm/va_drm_auth_x11.h | 34 +++++++++
4 files changed, 219 insertions(+), 1 deletion(-)
create mode 100644 va/drm/va_drm_auth_x11.c
create mode 100644 va/drm/va_drm_auth_x11.h
diff --git a/va/drm/Makefile.am b/va/drm/Makefile.am
index 1f576c7..f245730 100644
--- a/va/drm/Makefile.am
+++ b/va/drm/Makefile.am
@@ -37,8 +37,14 @@ source_h = \
source_h_priv = \
va_drm_auth.h \
+ va_drm_auth_x11.h \
$(NULL)
+if USE_X11
+source_c += va_drm_auth_x11.c
+INCLUDES += $(X11_CFLAGS)
+endif
+
noinst_LTLIBRARIES = libva_drm.la
libva_drmincludedir = ${includedir}/va
libva_drminclude_HEADERS = $(source_h)
diff --git a/va/drm/va_drm_auth.c b/va/drm/va_drm_auth.c
index cf31239..59aecaf 100644
--- a/va/drm/va_drm_auth.c
+++ b/va/drm/va_drm_auth.c
@@ -26,6 +26,7 @@
#include <unistd.h>
#include <xf86drm.h>
#include "va_drm_auth.h"
+#include "va_drm_auth_x11.h"
/* Checks whether DRM connection is authenticated */
bool
@@ -49,7 +50,12 @@ va_drm_is_authenticated(int fd)
bool
va_drm_authenticate(int fd, uint32_t magic)
{
- /* XXX: try to authenticate through Wayland, X11, etc. */
+ /* XXX: try to authenticate through Wayland, etc. */
+#ifdef HAVE_VA_X11
+ if (va_drm_authenticate_x11(fd, magic))
+ return true;
+#endif
+
/* Default: root + master privs are needed for the following call */
return drmAuthMagic(fd, magic) == 0;
}
diff --git a/va/drm/va_drm_auth_x11.c b/va/drm/va_drm_auth_x11.c
new file mode 100644
index 0000000..54e7402
--- /dev/null
+++ b/va/drm/va_drm_auth_x11.c
@@ -0,0 +1,172 @@
+/*
+ * Copyright (c) 2012 Intel Corporation. All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#define _GNU_SOURCE 1
+#include "sysdeps.h"
+#include <dlfcn.h>
+#include <X11/Xlib.h>
+#include "va_drm_auth_x11.h"
+
+#define LIBVA_MAJOR_VERSION 1
+
+typedef struct drm_auth_x11 DRMAuthX11;
+typedef struct drm_auth_x11_vtable DRMAuthX11VTable;
+
+typedef void (*VAGenericFunc)(void);
+typedef Display *(*X11OpenDisplayFunc)(const char *display_name);
+typedef int (*X11CloseDisplayFunc)(Display *display);
+typedef Bool (*VADRI2QueryExtensionFunc)(
+ Display *display, int *event_base, int *error_base);
+typedef Bool (*VADRI2QueryVersionFunc)(
+ Display *display, int *major, int *minor);
+typedef Bool (*VADRI2AuthenticateFunc)(
+ Display *display, XID window, uint32_t magic);
+
+struct drm_auth_x11_vtable {
+ X11OpenDisplayFunc x11_open_display;
+ X11CloseDisplayFunc x11_close_display;
+ VADRI2QueryExtensionFunc va_dri2_query_extension;
+ VADRI2QueryVersionFunc va_dri2_query_version;
+ VADRI2AuthenticateFunc va_dri2_authenticate;
+};
+
+struct drm_auth_x11 {
+ void *handle; /* libva-x11.so.1 */
+ DRMAuthX11VTable vtable;
+ Display *display;
+ Window window;
+};
+
+static bool
+get_symbol(void *handle, void *func_vptr, const char *name)
+{
+ VAGenericFunc func, *func_ptr = func_vptr;
+ const char *error;
+
+ dlerror();
+ func = (VAGenericFunc)dlsym(handle, name);
+ error = dlerror();
+
+ if (error) {
+ fprintf(stderr, "error: failed to resolve %s() function: %s\n",
+ name, error);
+ return false;
+ }
+
+ *func_ptr = func;
+ return true;
+}
+
+static bool
+drm_auth_x11_init(DRMAuthX11 *auth)
+{
+ struct drm_auth_x11_vtable *vtable;
+ char libva_x11_name[16];
+ int ret;
+
+ ret = snprintf(
+ libva_x11_name, sizeof(libva_x11_name),
+ "libva-x11.so.%d", LIBVA_MAJOR_VERSION
+ );
+ if (ret < 0 || ret >= sizeof(libva_x11_name))
+ return false;
+
+ auth->handle = dlopen(libva_x11_name, RTLD_LAZY | RTLD_GLOBAL);
+ if (!auth->handle) {
+ perror("open lib");
+ return false;
+ }
+
+ vtable = &auth->vtable;
+ if (!get_symbol(RTLD_DEFAULT, &vtable->x11_open_display, "XOpenDisplay"))
+ return false;
+ if (!get_symbol(RTLD_DEFAULT, &vtable->x11_close_display, "XCloseDisplay"))
+ return false;
+ if (!get_symbol(auth->handle, &vtable->va_dri2_query_extension,
+ "VA_DRI2QueryExtension"))
+ return false;
+ if (!get_symbol(auth->handle, &vtable->va_dri2_query_version,
+ "VA_DRI2QueryVersion"))
+ return false;
+ if (!get_symbol(auth->handle, &vtable->va_dri2_authenticate,
+ "VA_DRI2Authenticate"))
+ return false;
+
+ auth->display = vtable->x11_open_display(NULL);
+ if (!auth->display)
+ return false;
+
+ auth->window = DefaultRootWindow(auth->display);
+ return true;
+}
+
+static void
+drm_auth_x11_terminate(DRMAuthX11 *auth)
+{
+ if (!auth)
+ return;
+
+ if (auth->display) {
+ auth->vtable.x11_close_display(auth->display);
+ auth->display = NULL;
+ auth->window = None;
+ }
+
+ if (auth->handle) {
+ dlclose(auth->handle);
+ auth->handle = NULL;
+ }
+}
+
+static bool
+drm_auth_x11_authenticate(DRMAuthX11 *auth, int fd, uint32_t magic)
+{
+ DRMAuthX11VTable * const vtable = &auth->vtable;
+ int evt_base, err_base, v_major, v_minor;
+
+ if (!vtable->va_dri2_query_extension(auth->display, &evt_base, &err_base))
+ return false;
+ if (!vtable->va_dri2_query_version(auth->display, &v_major, &v_minor))
+ return false;
+ if (!vtable->va_dri2_authenticate(auth->display, auth->window, magic))
+ return false;
+ return true;
+}
+
+/* Try to authenticate the DRM connection with the supplied magic through X11 */
+bool
+va_drm_authenticate_x11(int fd, uint32_t magic)
+{
+ DRMAuthX11 auth;
+ bool success = false;
+
+ memset(&auth, 0, sizeof(auth));
+ if (!drm_auth_x11_init(&auth))
+ goto end;
+ success = drm_auth_x11_authenticate(&auth, fd, magic);
+
+end:
+ drm_auth_x11_terminate(&auth);
+ return success;
+}
diff --git a/va/drm/va_drm_auth_x11.h b/va/drm/va_drm_auth_x11.h
new file mode 100644
index 0000000..879a0dd
--- /dev/null
+++ b/va/drm/va_drm_auth_x11.h
@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2012 Intel Corporation. All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef VA_DRM_AUTH_X11_H
+#define VA_DRM_AUTH_X11_H
+
+#include <stdint.h>
+#include <stdbool.h>
+
+bool
+va_drm_authenticate_x11(int fd, uint32_t magic);
+
+#endif /* VA_DRM_AUTH_X11_H */
--
1.7.9.5
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