Move authentication to a common file

1 files changed, 86 insertions, 0 deletions

diff --git a/utils.c b/utils.c
new file mode 100644
index 0000000..276e21c
--- /dev/null
+++ b/utils.c
@@ -0,0 +1,86 @@
+/*
+ * utils.c
+ *
+ * Common bits
+ *
+ * (c) 2009 Thomas White <taw@bitwiz.org.uk>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+
+#include <X11/Xmd.h>
+#include <stdint.h>
+#include <drm/drm.h>
+
+#include "dri2.h"
+
+
+#define RING_LOCALS int __count = 0;
+#define OUT_REG(reg, val) cmds[__count++] = (reg); cmds[__count++] = (val);
+
+
+int do_drm_authentication(Display *dpy)
+{
+	int scrnum;
+	Window root;
+	char *driver;
+	char *device;
+	int fd;
+	drm_magic_t magic;
+
+	/* Get default screen, root window and default visual */
+	scrnum = DefaultScreen(dpy);
+	root = RootWindow(dpy, scrnum);
+
+	/* Get device name */
+	if ( !DRI2Connect(dpy, root, &driver, &device) ) {
+		fprintf(stderr, "DRI2Connect failed\n");
+	    	return -1;
+	}
+
+	/* Open DRM device */
+	fd = open(device, O_RDWR);
+	if ( fd < 0 ) {
+		fprintf(stderr, "Couldn't open '%s': %s\n",
+			device, strerror(errno));
+	    	return -1;
+	}
+
+	/* Get an authentication token */
+	if ( drmGetMagic(fd, &magic) ) {
+		fprintf(stderr, "drmGetMagic failed\n");
+	    	return -1;
+	}
+
+	/* Authenticate */
+	if ( DRI2Authenticate(dpy, root, magic) == False ) {
+		fprintf(stderr, "DRI2Authenticate failed\n");
+	    	return -1;
+	}
+
+	return fd;
+}