Attachment 8920 Details for Bug 9632 – And support larger DNS queries

[patch] And support larger DNS queries

0002-dns-Support-larger-queries-when-asking-forwarder.patch (text/plain), 3.98 KB, created by Kai Blin on 2013-05-25 11:35:32 UTC

(hide)

Description:

Filename:

MIME Type:

Creator: Kai Blin

Created: 2013-05-25 11:35:32 UTC

Size: 3.98 KB

patch

obsolete

>From 5125d3032220be03a1e89a4e7e4b752620a45fee Mon Sep 17 00:00:00 2001
>From: Kai Blin <kai@samba.org>
>Date: Sat, 25 May 2013 13:15:31 +0200
>Subject: [PATCH 2/2] dns: Support larger queries when asking forwarder
>
>This should fix bug #9632
>
>Signed-off-by: Kai Blin <kai@samba.org>
>---
> source4/dns_server/dns_query.c  | 13 +++++++++++++
> source4/dns_server/dns_server.c |  2 ++
> source4/dns_server/dns_server.h |  4 ++++
> source4/dns_server/dns_utils.c  | 21 +++++++++++++++++++++
> 4 files changed, 40 insertions(+)
>
>diff --git a/source4/dns_server/dns_query.c b/source4/dns_server/dns_query.c
>index 4ad14b9..5414e1d 100644
>--- a/source4/dns_server/dns_query.c
>+++ b/source4/dns_server/dns_query.c
>@@ -138,14 +138,17 @@ struct ask_forwarder_state {
> static void ask_forwarder_done(struct tevent_req *subreq);
> 
> static struct tevent_req *ask_forwarder_send(
>+	struct dns_server *dns,
> 	TALLOC_CTX *mem_ctx, struct tevent_context *ev,
> 	const char *forwarder, struct dns_name_question *question)
> {
> 	struct tevent_req *req, *subreq;
> 	struct ask_forwarder_state *state;
>+	struct dns_res_rec *options;
> 	struct dns_name_packet out_packet = { 0, };
> 	DATA_BLOB out_blob;
> 	enum ndr_err_code ndr_err;
>+	WERROR werr;
> 
> 	req = tevent_req_create(mem_ctx, &state, struct ask_forwarder_state);
> 	if (req == NULL) {
>@@ -166,6 +169,15 @@ static struct tevent_req *ask_forwarder_send(
> 	out_packet.qdcount = 1;
> 	out_packet.questions = question;
> 
>+	werr = dns_generate_options(dns, state, &options);
>+	if (!W_ERROR_IS_OK(werr)) {
>+		tevent_req_werror(req, werr);
>+		return tevent_req_post(req, ev);
>+	}
>+
>+	out_packet.arcount = 1;
>+	out_packet.additional = options;
>+
> 	ndr_err = ndr_push_struct_blob(
> 		&out_blob, state, &out_packet,
> 		(ndr_push_flags_fn_t)ndr_push_dns_name_packet);
>@@ -615,6 +627,7 @@ struct tevent_req *dns_server_process_query_send(
> 			  in->questions[0].name));
> 
> 		subreq = ask_forwarder_send(
>+			dns,
> 			state, ev, lpcfg_dns_forwarder(dns->task->lp_ctx),
> 			&in->questions[0]);
> 		if (tevent_req_nomem(subreq, req)) {
>diff --git a/source4/dns_server/dns_server.c b/source4/dns_server/dns_server.c
>index bb4605f..7ad4aca 100644
>--- a/source4/dns_server/dns_server.c
>+++ b/source4/dns_server/dns_server.c
>@@ -791,6 +791,8 @@ static void dns_task_init(struct task_server *task)
> 	}
> 
> 	dns->task = task;
>+	/*FIXME: Make this a configurable option */
>+	dns->max_payload = 4096;
> 
> 	dns->server_credentials = cli_credentials_init(dns);
> 	if (!dns->server_credentials) {
>diff --git a/source4/dns_server/dns_server.h b/source4/dns_server/dns_server.h
>index ef85730..efe4db8 100644
>--- a/source4/dns_server/dns_server.h
>+++ b/source4/dns_server/dns_server.h
>@@ -56,6 +56,7 @@ struct dns_server {
> 	struct dns_server_zone *zones;
> 	struct dns_server_tkey_store *tkeys;
> 	struct cli_credentials *server_credentials;
>+	uint16_t max_payload;
> };
> 
> struct dns_request_state {
>@@ -107,6 +108,9 @@ WERROR dns_name2dn(struct dns_server *dns,
> 		   TALLOC_CTX *mem_ctx,
> 		   const char *name,
> 		   struct ldb_dn **_dn);
>+WERROR dns_generate_options(struct dns_server *dns,
>+			    TALLOC_CTX *mem_ctx,
>+			    struct dns_res_rec **options);
> struct dns_server_tkey *dns_find_tkey(struct dns_server_tkey_store *store,
> 				      const char *name);
> WERROR dns_verify_tsig(struct dns_server *dns,
>diff --git a/source4/dns_server/dns_utils.c b/source4/dns_server/dns_utils.c
>index e03a409..21c7f5a 100644
>--- a/source4/dns_server/dns_utils.c
>+++ b/source4/dns_server/dns_utils.c
>@@ -378,3 +378,24 @@ WERROR dns_name2dn(struct dns_server *dns,
> 	*_dn = dn;
> 	return WERR_OK;
> }
>+
>+WERROR dns_generate_options(struct dns_server *dns,
>+			    TALLOC_CTX *mem_ctx,
>+			    struct dns_res_rec **options)
>+{
>+	struct dns_res_rec *o;
>+
>+	o = talloc_zero(mem_ctx, struct dns_res_rec);
>+	if (o == NULL) {
>+		return WERR_NOMEM;
>+	}
>+	o->name = '\0';
>+	o->rr_type = DNS_QTYPE_OPT;
>+	/* This is ugly, but RFC2671 wants the payload size in this field */
>+	o->rr_class = (enum dns_qclass) dns->max_payload;
>+	o->ttl = 0;
>+	o->length = 0;
>+
>+	*options = o;
>+	return WERR_OK;
>+}
>-- 
>1.8.1.2
>

Actions: View

Attachments on bug 9632: 8527 | 8528 | 8919 | 8920 | 8953 | 8954