add udev-acl

1 files changed, 84 insertions, 0 deletions

diff --git a/udev-acl/usbdev_id.c b/udev-acl/usbdev_id.c
new file mode 100644
index 0000000..5caeb97
--- /dev/null
+++ b/udev-acl/usbdev_id.c
@@ -0,0 +1,84 @@
+/*
+ * find all usb-device interfaces, and make them available in a single string
+ *
+ * Copyright (C) 2008 Kay Sievers <kay.sievers@vrfy.org>
+ *
+ * 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 2 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 <string.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdint.h>
+
+#define USB_DT_DEVICE			0x01
+#define USB_DT_INTERFACE		0x04
+
+static int devinfo(const char *syspath)
+{
+	char filename[1024];
+	int fd;
+	ssize_t size;
+	unsigned char buf[18 + 65535];
+	unsigned int pos;
+	struct usb_interface_descriptor {
+		u_int8_t	bLength;
+		u_int8_t	bDescriptorType;
+		u_int8_t	bInterfaceNumber;
+		u_int8_t	bAlternateSetting;
+		u_int8_t	bNumEndpoints;
+		u_int8_t	bInterfaceClass;
+		u_int8_t	bInterfaceSubClass;
+		u_int8_t	bInterfaceProtocol;
+		u_int8_t	iInterface;
+	};
+
+	strcpy(filename, "/sys");
+	strcat(filename, syspath);
+	strcat(filename, "/descriptors");
+	fd = open(filename, O_RDONLY);
+	if (fd < 0)
+		return -1;
+	size = read(fd, buf, sizeof(buf));
+	close(fd);
+	if (size < 18 || size == sizeof(buf))
+		return -1;
+
+	printf("ID_USB_INTERFACES=:");
+	pos = 0;
+	while (pos < sizeof(buf)) {
+		struct usb_interface_descriptor *desc;
+
+		desc = (struct usb_interface_descriptor *) &buf[pos];
+		if (desc->bLength < 3)
+			break;
+
+		if (desc->bDescriptorType == USB_DT_INTERFACE)
+			printf("%02x%02x%02x:", desc->bInterfaceClass, desc->bInterfaceSubClass, desc->bInterfaceProtocol);
+		pos += desc->bLength;
+	}
+	printf("\n");
+	return 0;
+}
+
+int main(int argc, char *argv[])
+{
+	const char *devpath = argv[1];
+
+	if (devpath == NULL)
+		return 1;
+	devinfo(devpath);
+	return 0;
+}