tests: add drm_get_client_auth

To check we don't break the magic authentication check libva does.

Ugh.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

tests/.gitignore

@@ -1,5 +1,6 @@
 # Please keep sorted alphabetically
 ddi_compute_wrpll
+drm_get_client_auth
 drm_vma_limiter
 drm_vma_limiter_cached
 drm_vma_limiter_cpu

tests/Makefile.am

@@ -48,6 +48,7 @@ TESTS_progs_M = \
 	$(NULL)
 
 TESTS_progs = \
+	drm_get_client_auth \
 	drm_vma_limiter \
 	drm_vma_limiter_cached \
 	drm_vma_limiter_cpu \

tests/drm_get_client_auth.c

@@ -0,0 +1,85 @@
+/*
+ * Copyright © 2012,2013 Intel Corporation
+ *
+ * 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, sublicense,
+ * 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 NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS 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.
+ *
+ * Authors:
+ *    Daniel Vetter <daniel.vetter@ffwll.ch>
+ *
+ * Based upon code from libva/va/drm/va_drm_auth.c:
+ */
+
+/*
+ * Testcase: Check that the hollowed-out get_client ioctl still works for libva
+ *
+ * Oh dear, libva, why do you do such funny things?
+ */
+
+#define _GNU_SOURCE
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+# include <sys/syscall.h>
+
+#include "drm.h"
+#include "i915_drm.h"
+#include "drmtest.h"
+
+/* Checks whether the thread id is the current thread */
+static bool
+is_local_tid(pid_t tid)
+{
+    /* On Linux systems, drmGetClient() would return the thread ID
+       instead of the actual process ID */
+    return syscall(SYS_gettid) == tid;
+}
+
+
+static bool check_auth(int fd)
+{
+	pid_t client_pid;
+	int i, auth, pid, uid;
+	unsigned long magic, iocs;
+	bool is_authenticated = false;
+
+	client_pid = getpid();
+	for (i = 0; !is_authenticated; i++) {
+		if (drmGetClient(fd, i, &auth, &pid, &uid, &magic, &iocs) != 0)
+			break;
+		is_authenticated = auth && (pid == client_pid || is_local_tid(pid));
+	}
+	return is_authenticated;
+}
+
+int main(int argc, char **argv)
+{
+	int fd;
+	bool auth;
+
+	fd = drm_open_any();
+
+	/* root (which we run igt as) should always be authenticated */
+	auth = check_auth(fd);
+	assert(auth);
+
+	return 0;
+}