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#include "sysdeps.h"
26#include <unistd.h>
27#include <xf86drm.h>
28#include "va_drm_auth.h"
29#include "va_drm_auth_x11.h"
30
31#if defined __linux__
32# include <sys/syscall.h>
33#endif
34
35/* Checks whether the thread id is the current thread */
36static bool
37is_local_tid(pid_t tid)
38{
39#if defined __linux__
40    /* On Linux systems, drmGetClient() would return the thread ID
41       instead of the actual process ID */
42    return syscall(SYS_gettid) == tid;
43#else
44    return false;
45#endif
46}
47
48/* Checks whether DRM connection is authenticated */
49bool
50va_drm_is_authenticated(int fd)
51{
52    pid_t client_pid;
53    int i, auth, pid, uid;
54    unsigned long magic, iocs;
55    bool is_authenticated = false;
56
57    client_pid = getpid();
58    for (i = 0; !is_authenticated; i++) {
59        if (drmGetClient(fd, i, &auth, &pid, &uid, &magic, &iocs) != 0)
60            break;
61        is_authenticated = auth && (pid == client_pid || is_local_tid(pid));
62    }
63    return is_authenticated;
64}
65
66/* Try to authenticate the DRM connection with the supplied magic id */
67bool
68va_drm_authenticate(int fd, uint32_t magic)
69{
70    /* XXX: try to authenticate through Wayland, etc. */
71#ifdef HAVE_VA_X11
72    if (va_drm_authenticate_x11(fd, magic))
73        return true;
74#endif
75
76    /* Default: root + master privs are needed for the following call */
77    return drmAuthMagic(fd, magic) == 0;
78}
79