Commit 7799f0c9 authored by Jukka Rissanen's avatar Jukka Rissanen Committed by Anas Nashif
Browse files

net: dns: Allow user to specify max answer length via Kconfig 

If the default max. answer length of 512 bytes is not enough,
user can specify it by setting CONFIG_DNS_RESOLVER_MAX_ANSWER_SIZE
to suitable value.

Signed-off-by: default avatarJukka Rissanen <jukka.rissanen@nordicsemi.no>
parent cf8b7d71

include/zephyr/net/dns_resolve.h

+4 −0
Changes for include/zephyr/net/dns_resolve.h: 4 added lines, 0 removed lines.
Original line number Diff line number Diff line
@@ -56,7 +56,11 @@ enum dns_query_type { 
#define DNS_BUF_TIMEOUT K_MSEC(500) /* ms */



/* This value is recommended by RFC 1035 */

#if defined(CONFIG_DNS_RESOLVER_MAX_ANSWER_SIZE)

#define DNS_RESOLVER_MAX_BUF_SIZE CONFIG_DNS_RESOLVER_MAX_ANSWER_SIZE

#else

#define DNS_RESOLVER_MAX_BUF_SIZE 512

#endif /* CONFIG_DNS_RESOLVER_MAX_ANSWER_SIZE */



/* Make sure that we can compile things even if CONFIG_DNS_RESOLVER

 * is not enabled.

subsys/net/lib/dns/Kconfig

+8 −0
Changes for subsys/net/lib/dns/Kconfig: 8 added lines, 0 removed lines.
Original line number Diff line number Diff line
@@ -61,6 +61,14 @@ config DNS_RESOLVER_MAX_SERVERS 
	  DNS server is enough. Each connection to DNS server will use one

	  network context.



config DNS_RESOLVER_MAX_ANSWER_SIZE

	int "Max length of a DNS answer"

	range 1 $(UINT16_MAX)

	default 512

	help

	  Max length of the returned DNS answer we can process.

	  Recommended value by RFC 1035 is 512 bytes.



config DNS_RESOLVER_MAX_QUERY_LEN

	int "Max length of a DNS query"

	range 1 $(UINT8_MAX)

subsys/net/lib/dns/llmnr_responder.c

+0 −1
Changes for subsys/net/lib/dns/llmnr_responder.c: 0 added lines, 1 removed line.
Original line number Diff line number Diff line
@@ -53,7 +53,6 @@ static struct net_mgmt_event_callback mgmt_cb; 
#define BUF_ALLOC_TIMEOUT K_MSEC(100)



/* This value is recommended by RFC 1035 */

#define DNS_RESOLVER_MAX_BUF_SIZE	512

#define DNS_RESOLVER_MIN_BUF		2

#define DNS_RESOLVER_BUF_CTR	(DNS_RESOLVER_MIN_BUF + \

				 CONFIG_LLMNR_RESOLVER_ADDITIONAL_BUF_CTR)

tests/net/lib/dns_packet/src/main.c

+0 −1
Changes for tests/net/lib/dns_packet/src/main.c: 0 added lines, 1 removed line.
Original line number Diff line number Diff line
@@ -1144,7 +1144,6 @@ static void run_dns_valid_response(const char *test_case, 
		      test_case, ret);

}



#define DNS_RESOLVER_MAX_BUF_SIZE	512

#define DNS_RESOLVER_MIN_BUF	1

#define DNS_RESOLVER_BUF_CTR	(DNS_RESOLVER_MIN_BUF + 1)

#define DNS_MAX_NAME_LEN	255

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