1 /* 2 * Copyright (c) 2012 Intel Corporation. All Rights Reserved. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the 6 * "Software"), to deal in the Software without restriction, including 7 * without limitation the rights to use, copy, modify, merge, publish, 8 * distribute, sub license, and/or sell copies of the Software, and to 9 * permit persons to whom the Software is furnished to do so, subject to 10 * the following conditions: 11 * 12 * The above copyright notice and this permission notice (including the 13 * next paragraph) shall be included in all copies or substantial portions 14 * of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. 19 * IN NO EVENT SHALL PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR 20 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 21 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE 22 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 23 */ 24 25 #define _GNU_SOURCE 1 26 #include "sysdeps.h" 27 #include <dlfcn.h> 28 #include <X11/Xlib.h> 29 #include "va_drm_auth_x11.h" 30 31 #define LIBVA_MAJOR_VERSION 1 32 33 typedef struct drm_auth_x11 DRMAuthX11; 34 typedef struct drm_auth_x11_vtable DRMAuthX11VTable; 35 36 typedef void (*VAGenericFunc)(void); 37 typedef Display *(*X11OpenDisplayFunc)(const char *display_name); 38 typedef int (*X11CloseDisplayFunc)(Display *display); 39 typedef Bool (*VADRI2QueryExtensionFunc)( 40 Display *display, int *event_base, int *error_base); 41 typedef Bool (*VADRI2QueryVersionFunc)( 42 Display *display, int *major, int *minor); 43 typedef Bool (*VADRI2AuthenticateFunc)( 44 Display *display, XID window, uint32_t magic); 45 46 struct drm_auth_x11_vtable { 47 X11OpenDisplayFunc x11_open_display; 48 X11CloseDisplayFunc x11_close_display; 49 VADRI2QueryExtensionFunc va_dri2_query_extension; 50 VADRI2QueryVersionFunc va_dri2_query_version; 51 VADRI2AuthenticateFunc va_dri2_authenticate; 52 }; 53 54 struct drm_auth_x11 { 55 void *handle; /* libva-x11.so.1 */ 56 DRMAuthX11VTable vtable; 57 Display *display; 58 Window window; 59 }; 60 61 static bool 62 get_symbol(void *handle, void *func_vptr, const char *name) 63 { 64 VAGenericFunc func, *func_ptr = func_vptr; 65 const char *error; 66 67 dlerror(); 68 func = (VAGenericFunc)dlsym(handle, name); 69 error = dlerror(); 70 71 if (error) { 72 fprintf(stderr, "error: failed to resolve %s() function: %s\n", 73 name, error); 74 return false; 75 } 76 77 *func_ptr = func; 78 return true; 79 } 80 81 static bool 82 drm_auth_x11_init(DRMAuthX11 *auth) 83 { 84 struct drm_auth_x11_vtable *vtable; 85 char libva_x11_name[16]; 86 int ret; 87 88 ret = snprintf( 89 libva_x11_name, sizeof(libva_x11_name), 90 "libva-x11.so.%d", LIBVA_MAJOR_VERSION 91 ); 92 if (ret < 0 || ret >= sizeof(libva_x11_name)) 93 return false; 94 95 auth->handle = dlopen(libva_x11_name, RTLD_LAZY | RTLD_GLOBAL); 96 if (!auth->handle) { 97 perror("open lib"); 98 return false; 99 } 100 101 vtable = &auth->vtable; 102 if (!get_symbol(RTLD_DEFAULT, &vtable->x11_open_display, "XOpenDisplay")) 103 return false; 104 if (!get_symbol(RTLD_DEFAULT, &vtable->x11_close_display, "XCloseDisplay")) 105 return false; 106 if (!get_symbol(auth->handle, &vtable->va_dri2_query_extension, 107 "VA_DRI2QueryExtension")) 108 return false; 109 if (!get_symbol(auth->handle, &vtable->va_dri2_query_version, 110 "VA_DRI2QueryVersion")) 111 return false; 112 if (!get_symbol(auth->handle, &vtable->va_dri2_authenticate, 113 "VA_DRI2Authenticate")) 114 return false; 115 116 auth->display = vtable->x11_open_display(NULL); 117 if (!auth->display) 118 return false; 119 120 auth->window = DefaultRootWindow(auth->display); 121 return true; 122 } 123 124 static void 125 drm_auth_x11_terminate(DRMAuthX11 *auth) 126 { 127 if (!auth) 128 return; 129 130 if (auth->display) { 131 auth->vtable.x11_close_display(auth->display); 132 auth->display = NULL; 133 auth->window = None; 134 } 135 136 if (auth->handle) { 137 dlclose(auth->handle); 138 auth->handle = NULL; 139 } 140 } 141 142 static bool 143 drm_auth_x11_authenticate(DRMAuthX11 *auth, int fd, uint32_t magic) 144 { 145 DRMAuthX11VTable * const vtable = &auth->vtable; 146 int evt_base, err_base, v_major, v_minor; 147 148 if (!vtable->va_dri2_query_extension(auth->display, &evt_base, &err_base)) 149 return false; 150 if (!vtable->va_dri2_query_version(auth->display, &v_major, &v_minor)) 151 return false; 152 if (!vtable->va_dri2_authenticate(auth->display, auth->window, magic)) 153 return false; 154 return true; 155 } 156 157 /* Try to authenticate the DRM connection with the supplied magic through X11 */ 158 bool 159 va_drm_authenticate_x11(int fd, uint32_t magic) 160 { 161 DRMAuthX11 auth; 162 bool success = false; 163 164 memset(&auth, 0, sizeof(auth)); 165 if (!drm_auth_x11_init(&auth)) 166 goto end; 167 success = drm_auth_x11_authenticate(&auth, fd, magic); 168 169 end: 170 drm_auth_x11_terminate(&auth); 171 return success; 172 } 173
