This file contains temporary data structures and routines to create compressed DNS messages. More...
Functions | |
int | reply_info_answer_encode (struct query_info *qinf, struct reply_info *rep, uint16_t id, uint16_t qflags, ldns_buffer *dest, uint32_t timenow, int cached, struct regional *region, uint16_t udpsize, struct edns_data *edns, int dnssec, int secure) |
Generate answer from reply_info. | |
int | reply_info_encode (struct query_info *qinfo, struct reply_info *rep, uint16_t id, uint16_t flags, ldns_buffer *buffer, uint32_t timenow, struct regional *region, uint16_t udpsize, int dnssec) |
Regenerate the wireformat from the stored msg reply. | |
void | qinfo_query_encode (ldns_buffer *pkt, struct query_info *qinfo) |
Encode query packet. | |
uint16_t | calc_edns_field_size (struct edns_data *edns) |
Estimate size of EDNS record in packet. | |
void | attach_edns_record (ldns_buffer *pkt, struct edns_data *edns) |
Attach EDNS record to buffer. | |
void | error_encode (ldns_buffer *pkt, int r, struct query_info *qinfo, uint16_t qid, uint16_t qflags, struct edns_data *edns) |
Encode an error. |
This file contains temporary data structures and routines to create compressed DNS messages.
int reply_info_answer_encode | ( | struct query_info * | qinf, | |
struct reply_info * | rep, | |||
uint16_t | id, | |||
uint16_t | qflags, | |||
ldns_buffer * | dest, | |||
uint32_t | timenow, | |||
int | cached, | |||
struct regional * | region, | |||
uint16_t | udpsize, | |||
struct edns_data * | edns, | |||
int | dnssec, | |||
int | secure | |||
) |
Generate answer from reply_info.
qinf,: | query information that provides query section in packet. | |
rep,: | reply to fill in. | |
id,: | id word from the query. | |
qflags,: | flags word from the query. | |
dest,: | buffer to put message into; will truncate if it does not fit. | |
timenow,: | time to subtract. | |
cached,: | set true if a cached reply (so no AA bit). set false for the first reply. | |
region,: | where to allocate temp variables (for compression). | |
udpsize,: | size of the answer, 512, from EDNS, or 64k for TCP. | |
edns,: | EDNS data included in the answer, NULL for none. or if edns_present = 0, it is not included. | |
dnssec,: | if 0 DNSSEC records are omitted from the answer. | |
secure,: | if 1, the AD bit is set in the reply. |
References attach_edns_record(), reply_info::authoritative, BIT_AA, BIT_AD, BIT_CD, BIT_QR, BIT_RD, calc_edns_field_size(), reply_info::flags, log_assert, log_err(), and reply_info_encode().
Referenced by answer_from_cache(), answer_norec_from_cache(), local_encode(), mesh_do_callback(), and mesh_send_reply().
int reply_info_encode | ( | struct query_info * | qinfo, | |
struct reply_info * | rep, | |||
uint16_t | id, | |||
uint16_t | flags, | |||
ldns_buffer * | buffer, | |||
uint32_t | timenow, | |||
struct regional * | region, | |||
uint16_t | udpsize, | |||
int | dnssec | |||
) |
Regenerate the wireformat from the stored msg reply.
If the buffer is too small then the message is truncated at a whole rrset and the TC bit set, or whole rrsets are left out of the additional and the TC bit is not set.
qinfo,: | query info to store. | |
rep,: | reply to store. | |
id,: | id value to store, network order. | |
flags,: | flags value to store, host order. | |
buffer,: | buffer to store the packet into. | |
timenow,: | time now, to adjust ttl values. | |
region,: | to store temporary data in. | |
udpsize,: | size of the answer, 512, from EDNS, or 64k for TCP. | |
dnssec,: | if 0 DNSSEC records are omitted from the answer. |
References reply_info::an_numrrsets, reply_info::ar_numrrsets, insert_query(), insert_section(), reply_info::ns_numrrsets, reply_info::qdcount, query_info::qtype, RETVAL_OK, and RETVAL_TRUNC.
Referenced by log_dns_msg(), perf_encode(), reply_info_answer_encode(), and testpkt().
void qinfo_query_encode | ( | ldns_buffer * | pkt, | |
struct query_info * | qinfo | |||
) |
Encode query packet.
Assumes the buffer is large enough.
pkt,: | where to store the packet. | |
qinfo,: | query info. |
References log_assert, query_info::qclass, query_info::qname, query_info::qname_len, and query_info::qtype.
Referenced by qlist_parse_line(), and write_q().
uint16_t calc_edns_field_size | ( | struct edns_data * | edns | ) |
Estimate size of EDNS record in packet.
EDNS record will be no larger.
edns,: | edns data or NULL. |
References edns_data::edns_present.
Referenced by error_encode(), reply_info_answer_encode(), and testpkt().
void attach_edns_record | ( | ldns_buffer * | pkt, | |
struct edns_data * | edns | |||
) |
Attach EDNS record to buffer.
Buffer has complete packet. There must be enough room left for the EDNS record.
pkt,: | packet added to. | |
edns,: | if NULL or present=0, nothing is added to the packet. |
References edns_data::bits, edns_data::edns_present, edns_data::edns_version, edns_data::ext_rcode, and edns_data::udp_size.
Referenced by chaos_replystr(), error_encode(), outnet_serviced_query(), perf_encode(), qlist_parse_line(), reply_info_answer_encode(), serviced_encode(), testpkt(), and worker_handle_request().
void error_encode | ( | ldns_buffer * | pkt, | |
int | r, | |||
struct query_info * | qinfo, | |||
uint16_t | qid, | |||
uint16_t | qflags, | |||
struct edns_data * | edns | |||
) |
Encode an error.
With QR and RA set.
pkt,: | where to store the packet. | |
r,: | RCODE value to encode. | |
qinfo,: | if not NULL, the query is included. | |
qid,: | query ID to set in packet. network order. | |
qflags,: | original query flags (to copy RD and CD bits). host order. | |
edns,: | if not NULL, this is the query edns info, and an edns reply is attached. Only attached if EDNS record fits reply. |
References attach_edns_record(), BIT_CD, BIT_QR, BIT_RA, BIT_RD, edns_data::bits, calc_edns_field_size(), EDNS_ADVERTISED_SIZE, EDNS_ADVERTISED_VERSION, EDNS_DO, edns_data::edns_version, edns_data::ext_rcode, query_info::qclass, query_info::qname, query_info::qname_len, query_info::qtype, and edns_data::udp_size.
Referenced by answer_from_cache(), answer_norec_from_cache(), libworker_bg_done_cb(), local_encode(), lz_zone_answer(), mesh_new_client(), mesh_send_reply(), and worker_handle_request().