|#define ||PARSE_TABLE_SIZE 32|
| ||number of buckets in parse rrset hash table. More...|
#define ||NORR_TTL 5 /* seconds */|
| ||Negative cache time (for entries without any RRs.) |
|#define ||LABEL_IS_PTR(x) ( ((x)&0xc0) == 0xc0 )|
| ||Check if label length is first octet of a compression pointer, pass u8. More...|
|#define ||PTR_OFFSET(x, y) ( ((x)&0x3f)<<8 | (y) )|
| ||Calculate destination offset of a compression pointer. More...|
|#define ||PTR_CREATE(offset) ((uint16_t)(0xc000 | (offset)))|
| ||create a compression pointer to the given offset. More...|
|#define ||EDNS_RCODE_BADVERS 16 /** bad EDNS version */|
| ||error codes, extended with EDNS, so > 15. More...|
#define ||PTR_MAX_OFFSET 0x3fff|
| ||largest valid compression offset |
|size_t ||get_rdf_size (sldns_rdf_type rdf)|
| ||Obtain size in the packet of an rr type, that is before dname type. More...|
|int ||parse_packet (struct sldns_buffer *pkt, struct msg_parse *msg, struct regional *region)|
| ||Parse the packet. More...|
|int ||parse_extract_edns (struct msg_parse *msg, struct edns_data *edns, struct regional *region)|
| ||After parsing the packet, extract EDNS data from packet. More...|
|int ||parse_edns_from_pkt (struct sldns_buffer *pkt, struct edns_data *edns, struct regional *region)|
| ||If EDNS data follows a query section, extract it and initialize edns struct. More...|
|hashvalue_type ||pkt_hash_rrset (struct sldns_buffer *pkt, uint8_t *dname, uint16_t type, uint16_t dclass, uint32_t rrset_flags)|
| ||Calculate hash value for rrset in packet. More...|
|struct rrset_parse * ||msgparse_hashtable_lookup (struct msg_parse *msg, struct sldns_buffer *pkt, hashvalue_type h, uint32_t rrset_flags, uint8_t *dname, size_t dnamelen, uint16_t type, uint16_t dclass)|
| ||Lookup in msg hashtable to find a rrset. More...|
|void ||msgparse_bucket_remove (struct msg_parse *msg, struct rrset_parse *rrset)|
| ||Remove rrset from hash table. More...|
|void ||log_edns_opt_list (enum verbosity_value level, const char *info_str, struct edns_option *list)|
| ||Log the edns options in the edns option list. More...|
Contains message parsing data structures.
These point back into the packet buffer.
During parsing RRSIGS are put together with the rrsets they (claim to) sign. This process works as follows: o if RRSIG follows the data rrset, it is added to the rrset rrsig list. o if no matching data rrset is found, the RRSIG becomes a new rrset. o If the data rrset later follows the RRSIG o See if the RRSIG rrset contains multiple types, and needs to have the rrsig(s) for that data type split off. o Put the data rr as data type in the rrset and rrsig in list. o RRSIGs are allowed to move to a different section. The section of the data item is used for the final rrset. o multiple signatures over an RRset are possible.
For queries of qtype=RRSIG, some special handling is needed, to avoid splitting the RRSIG in the answer section. o duplicate, not split, RRSIGs from the answer section, if qtype=RRSIG. o check for doubles in the rrsig list when adding an RRSIG to data, so that a data rrset is signed by RRSIGs with different rdata. when qtype=RRSIG. This will move the RRSIG from the answer section to sign the data further in the packet (if possible). If then after that, more RRSIGs are found that sign the data as well, doubles are removed.
After parsing the packet, extract EDNS data from packet.
If not present this is noted in the data structure. If a parse error happens, an error code is returned.
Quirks: o ignores OPT rdata. o ignores OPT owner name. o ignores extra OPT records, except the last one in the packet.
|msg||parsed message structure. Modified on exit, if EDNS was present it is removed from the additional section. |
|edns||the edns data is stored here. Does not have to be initialised. |
|region||region to alloc results in (edns option contents) |
- : 0 on success. or an RCODE on an error. RCODE formerr if OPT in wrong section, and so on.
References LDNS_RR_TYPE_OPT, msg_parse::rrset_first, and rrset_parse::type.