add back in udhcp support

networking/udhcp/options.h

@@ -0,0 +1,38 @@
+/* options.h */
+#ifndef _OPTIONS_H
+#define _OPTIONS_H
+
+#include "packet.h"
+
+#define TYPE_MASK	0x0F
+
+enum {
+	OPTION_IP=1,
+	OPTION_IP_PAIR,
+	OPTION_STRING,
+	OPTION_BOOLEAN,
+	OPTION_U8,
+	OPTION_U16,
+	OPTION_S16,
+	OPTION_U32,
+	OPTION_S32
+};
+
+#define OPTION_REQ	0x10 /* have the client request this option */
+#define OPTION_LIST	0x20 /* There can be a list of 1 or more of these */
+
+struct dhcp_option {
+	char name[10];
+	char flags;
+	uint8_t code;
+};
+
+extern struct dhcp_option dhcp_options[];
+extern int option_lengths[];
+
+uint8_t *get_option(struct dhcpMessage *packet, int code);
+int end_option(uint8_t *optionptr);
+int add_option_string(uint8_t *optionptr, uint8_t *string);
+int add_simple_option(uint8_t *optionptr, uint8_t code, uint32_t data);
+
+#endif