hidraw: fallback to HID_NAME

if we can't get the vendor/product string of the USB attributes, fallback to the HID_NAME string collected from the uevent.

src/hid_linux.c

@@ -77,7 +77,7 @@ is_fido(const char *path)
 
 static int
 parse_uevent(const char *uevent, int *bus, int16_t *vendor_id,
-    int16_t *product_id)
+    int16_t *product_id, char **hid_name)
 {
 	char			*cp;
 	char			*p;
@@ -86,6 +86,7 @@ parse_uevent(const char *uevent, int *bus, int16_t *vendor_id,
 	short unsigned int	 x;
 	short unsigned int	 y;
 	short unsigned int	 z;
+	char			name[80];
 
 	if ((s = cp = strdup(uevent)) == NULL)
 		return (-1);
@@ -97,8 +98,14 @@ parse_uevent(const char *uevent, int *bus, int16_t *vendor_id,
 				*vendor_id = (int16_t)y;
 				*product_id = (int16_t)z;
 				ok = 0;
-				break;
 			}
+			continue;
+		}
+		if (strncmp(p, "HID_NAME=", 9) == 0 && hid_name != NULL) {
+			if (sscanf(p + 9, "%79[^\n]s", name) == 1) {
+				*hid_name = strdup(name);
+			}
+			continue;
 		}
 	}
 
@@ -137,6 +144,7 @@ copy_info(fido_dev_info_t *di, struct udev *udev,
 	char			*uevent = NULL;
 	struct udev_device	*dev = NULL;
 	int			 bus = 0;
+	char		*hid_name = NULL;
 	int			 ok = -1;
 
 	memset(di, 0, sizeof(*di));
@@ -148,7 +156,7 @@ copy_info(fido_dev_info_t *di, struct udev *udev,
 		goto fail;
 
 	if ((uevent = get_parent_attr(dev, "hid", NULL, "uevent")) == NULL ||
-	    parse_uevent(uevent, &bus, &di->vendor_id, &di->product_id) < 0) {
+	    parse_uevent(uevent, &bus, &di->vendor_id, &di->product_id, &hid_name) < 0) {
 		fido_log_debug("%s: uevent", __func__);
 		goto fail;
 	}
@@ -165,6 +173,24 @@ copy_info(fido_dev_info_t *di, struct udev *udev,
 		di->manufacturer = strdup("");
 	if ((di->product = get_usb_attr(dev, "product")) == NULL)
 		di->product = strdup("");
+	if (strnlen(di->manufacturer, 1) == 0 && strnlen(di->product, 1) == 0) {
+		char* first_space = strchr(hid_name, ' ');
+		if (first_space == NULL) {
+			free(di->manufacturer);
+			di->manufacturer = strdup(hid_name);
+		} else {
+			size_t manufacturer_length = (size_t) (first_space - hid_name);
+
+			free(di->manufacturer);
+			di->manufacturer = malloc(manufacturer_length + 1);
+			strncpy(di->manufacturer, hid_name, manufacturer_length);
+			di->manufacturer[manufacturer_length] = '\0';
+
+			free(di->product);
+			di->product = strdup(first_space+1);
+
+		}
+	}
 	if (di->path == NULL || di->manufacturer == NULL || di->product == NULL)
 		goto fail;
 
@@ -174,6 +200,7 @@ copy_info(fido_dev_info_t *di, struct udev *udev,
 		udev_device_unref(dev);
 
 	free(uevent);
+	free(hid_name);
 
 	if (ok < 0) {
 		free(di->path);