/* * edns.h -- EDNS definitions (RFC 2671). * * Copyright (c) 2001-2006, NLnet Labs. All rights reserved. * * See LICENSE for the license. * */ #ifndef _EDNS_H_ #define _EDNS_H_ #include "buffer.h" struct nsd; struct query; #define OPT_LEN 9U /* Length of the NSD EDNS response record minus 2 */ #define OPT_RDATA 2 /* holds the rdata length comes after OPT_LEN */ #define OPT_HDR 4U /* NSID opt header length */ #define NSID_CODE 3 /* nsid option code */ #define DNSSEC_OK_MASK 0x8000U /* do bit mask */ struct edns_data { char ok[OPT_LEN]; char error[OPT_LEN]; char rdata_none[OPT_RDATA]; char rdata_nsid[OPT_RDATA]; char nsid[OPT_HDR]; }; typedef struct edns_data edns_data_type; enum edns_status { EDNS_NOT_PRESENT, EDNS_OK, /* EDNS states may be extended in the future */ EDNS_ERROR }; typedef enum edns_status edns_status_type; struct edns_record { edns_status_type status; size_t position; size_t maxlen; size_t opt_reserved_space; int dnssec_ok; int nsid; }; typedef struct edns_record edns_record_type; void edns_init_data(edns_data_type *data, uint16_t max_length); void edns_init_record(edns_record_type *data); int edns_parse_record(edns_record_type *data, buffer_type *packet, struct query* q, struct nsd* nsd); /* * The amount of space to reserve in the response for the EDNS data * (if required). */ size_t edns_reserved_space(edns_record_type *data); void edns_init_nsid(edns_data_type *data, uint16_t nsid_len); #endif /* _EDNS_H_ */ |