DNS cache

DNS cache More...

Detailed Description

DNS cache

Files
file	cache.h
	DNS cache definitions.

Macros
#define	CONFIG_DNS_CACHE_SIZE   4
	Maximum number of DNS cache entries.
#define	CONFIG_DNS_CACHE_A   IS_USED(MODULE_IPV4)
	Handle to cache A records.
#define	CONFIG_DNS_CACHE_AAAA   IS_USED(MODULE_IPV6)
	Handle to cache AAAA records.

Functions
int	dns_cache_query (const char *domain_name, void *addr_out, int family)
	Get IP address for a DNS name from the DNS cache.
void	dns_cache_add (const char *domain_name, const void *addr, int addr_len, uint32_t ttl)
	Add an IP address for a DNS name to the DNS cache.

Macro Definition Documentation

CONFIG_DNS_CACHE_A

#define CONFIG_DNS_CACHE_A   IS_USED(MODULE_IPV4)

Handle to cache A records.

Definition at line 55 of file cache.h.

CONFIG_DNS_CACHE_AAAA

#define CONFIG_DNS_CACHE_AAAA   IS_USED(MODULE_IPV6)

Handle to cache AAAA records.

Definition at line 62 of file cache.h.

CONFIG_DNS_CACHE_SIZE

#define CONFIG_DNS_CACHE_SIZE   4

Maximum number of DNS cache entries.

Definition at line 48 of file cache.h.

Function Documentation

dns_cache_add()

void dns_cache_add	(	const char *	domain_name,
		const void *	addr,
		int	addr_len,
		uint32_t	ttl )

Add an IP address for a DNS name to the DNS cache.

Parameters

[in]	domain_name	DNS name to resolve into address
[in]	addr	buffer containing the address
[in]	addr_len	length of the address in bytes
[in]	ttl	lifetime of the entry in seconds

dns_cache_query()

int dns_cache_query	(	const char *	domain_name,
		void *	addr_out,
		int	family )

Get IP address for a DNS name from the DNS cache.

Parameters

[in]	domain_name	DNS name to resolve into address
[out]	addr_out	buffer to write result into
[in]	family	Either AF_INET, AF_INET6 or AF_UNSPEC

Returns

the size of the resolved address on success

<= 0 otherwise