Add missing license info

ethsock.c

@@ -1,3 +1,22 @@
+/**
+ * nmrpflash - Netgear Unbrick Utility
+ * Copyright (C) 2016 Joseph Lehner <joseph.c.lehner@gmail.com>
+ *
+ * nmrpflash 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.
+ *
+ * nmrpflash 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 nmrpflash.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
 #include <sys/types.h>
 #include <stdbool.h>
 #include <string.h>

util.c

@@ -1,3 +1,22 @@
+/**
+ * nmrpflash - Netgear Unbrick Utility
+ * Copyright (C) 2016 Joseph Lehner <joseph.c.lehner@gmail.com>
+ *
+ * nmrpflash 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.
+ *
+ * nmrpflash 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 nmrpflash.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
 #include <stdio.h>
 #include <errno.h>
 #include <time.h>