#include "stdhead.h"#include "renew.h"#include "clilib.h"#include "parse.h"#include "solicit.h"struct DHCP_MESSAGE * create_renew_message (struct DHCP_MESSAGE * server_reply, char * interface_name){    struct DHCP_MESSAGE * renew_message_ptr = (struct DHCP_MESSAGE *) malloc (sizeof (struct DHCP_MESSAGE));    struct OPTIONS * options_ptr;    struct DUID *duid_ptr;    struct IA *ia_ptr;    struct IA_ADDRESS *iaaddr_ptr;    struct interface *interface_details;        renew_message_ptr -> u_msg_type.msg_type = RENEW;    generate_trans_id (&renew_message_ptr -> u_trans_id.trans_id);    interface_details = get_interface_details (interface_name);    renew_message_ptr -> opt = add_client_id_option (interface_details);    duid_ptr = (struct DUID *) renew_message_ptr -> opt -> opt_data;    duid_ptr -> opt = copy_message_option (server_reply, OPTION_SERVERID);    duid_ptr = (struct DUID *) duid_ptr -> opt -> opt_data;    duid_ptr -> opt = copy_message_option (server_reply, OPTION_IA);    ia_ptr = (struct IA *) duid_ptr -> opt -> opt_data;    ia_ptr -> opt = copy_message_option (server_reply, OPTION_IAADDR);    iaaddr_ptr = (struct IA_ADDRESS *) ia_ptr -> opt -> opt_data;    iaaddr_ptr -> opt = 0;        return renew_message_ptr;}