#include "stdhead.h" #include "request.h" #include "clilib.h" // This function creates a REQUEST message from the ADCVERTISE message and // returns a pointer to the REQUEST message struct DHCP_MESSAGE * create_request_message (struct DHCP_MESSAGE *advertise_message, char *interface_name) { // Allocate memory fot the REPLY message struct DHCP_MESSAGE *dhcp_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; // Assign the message type as REQUEST dhcp_message_ptr -> u_msg_type.msg_type = REQUEST; // Generate the Transaction Id generate_trans_id (&dhcp_message_ptr -> u_trans_id.trans_id); // Copy and paste the Client Id option from the ADVERTISE message into // the REQUEST message dhcp_message_ptr -> opt = copy_message_option (advertise_message, OPTION_CLIENTID); // Move onto to the next (option) next (duid) node duid_ptr = (struct DUID *) dhcp_message_ptr -> opt -> opt_data; // Copy and Paste the Server Id option from the ADVERTISE message into the // REQUEST message duid_ptr -> opt = copy_message_option (advertise_message, OPTION_SERVERID); // Move onto to the next (option) next (duid) node duid_ptr = (struct DUID *) duid_ptr -> opt -> opt_data; // Copy and Paste the IA option from the ADVERTISE message into the // REQUEST message duid_ptr -> opt = copy_message_option (advertise_message, OPTION_IA); // Move onto to the next (option) next (ia) node ia_ptr = (struct IA *) duid_ptr -> opt -> opt_data; // Copy and Paste the IA_ADDRESS option from the ADVERTISE message into the // REQUEST message ia_ptr -> opt = copy_message_option (advertise_message, OPTION_IAADDR); // Move onto to the next (option) next (ia_address) node iaaddr_ptr = (struct IA_ADDRESS *) ia_ptr -> opt -> opt_data; // Assign the next option pointer as zero iaaddr_ptr -> opt = 0; return dhcp_message_ptr; }
