n_dns.h File Reference

Minimal DNS message helpers: parse a query question and build an A-record response. More...

#include <stddef.h>
#include <stdint.h>

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Macros
#define	N_DNS_QNAME_MAX   256
	Maximum decoded QNAME length, including the terminating NUL.
#define	N_DNS_TYPE_A   1
	DNS resource-record type A (IPv4 address).

Functions
int	n_dns_build_a_response (const unsigned char *query, size_t qlen, uint32_t ipv4_be, uint32_t ttl, unsigned char *out, size_t outsz)
	Build a DNS response answering a query's first question with one A record.
int	n_dns_parse_query (const unsigned char *msg, size_t len, uint16_t *id_out, char *qname_out, size_t qname_sz, uint16_t *qtype_out)
	Parse the header id and the first question (QNAME + QTYPE) of a DNS message.

Detailed Description

Minimal DNS message helpers: parse a query question and build an A-record response.

Author

Castagnier Mickael

Version

1.0

Definition in file n_dns.h.