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* resolv/res_init.c (res_setoptions): Recognize edns0 option.

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* resolv/res_mkquery.c: Define __res_nopt.
	* resolv/res_query.c (__libc_res_nquery): If RES_USE_EDNS0 is set
	try adding EDNS0 record.
	* resolv/res_send.c (send_dg): If request failed with FORMERR and
	EDNS0 record was send make sure we don't try it again.
	* resolv/resolv.h: Define RES_F_EDNS0ERR and RES_USE_EDNS0.
	* include/resolv.h: Declare __res_nopt.
This commit is contained in:
Ulrich Drepper
2007-02-09 23:46:29 +00:00
parent 00458b5bee
commit 2bbb7d5b3c
7 changed files with 104 additions and 7 deletions
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2
resolv/resolv.h
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@@ -180,6 +180,7 @@ struct res_sym {
*/
#define RES_F_VC 0x00000001 /* socket is TCP */
#define RES_F_CONN 0x00000002 /* socket is connected */
#define RES_F_EDNS0ERR 0x00000004 /* EDNS0 caused errors */
/* res_findzonecut() options */
#define RES_EXHAUSTIVE 0x00000001 /* always do all queries */
@@ -209,6 +210,7 @@ struct res_sym {
strings */
#define RES_NOIP6DOTINT 0x00080000 /* Do not use .ip6.int in IPv6
reverse lookup */
#define RES_USE_EDNS0 0x00100000 /* Use EDNS0. */
#define RES_DEFAULT (RES_RECURSE|RES_DEFNAMES|RES_DNSRCH|RES_NOIP6DOTINT)