From 2e2e0f8848b59951e81c79824e44b40beb349aa6 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Vladim=C3=ADr=20=C4=8Cun=C3=A1t?= <vladimir.cunat@nic.cz>
Date: Wed, 15 Feb 2017 18:15:11 +0100
Subject: [PATCH] workarounds: add code to deal with #139

---
 daemon/lua/kres-gen.lua             |  9 +++++++++
 daemon/lua/kres-gen.sh              |  7 +++++--
 modules/workarounds/workarounds.lua | 24 ++++++++++++++++++++++++
 3 files changed, 38 insertions(+), 2 deletions(-)

diff --git a/daemon/lua/kres-gen.lua b/daemon/lua/kres-gen.lua
index f69a33760..6ccab78b4 100644
--- a/daemon/lua/kres-gen.lua
+++ b/daemon/lua/kres-gen.lua
@@ -130,6 +130,13 @@ struct knot_rrset {
     knot_rdataset_t rrs;
     void *additional;
 };
+struct kr_nsrep {
+    unsigned int score;
+    unsigned int reputation;
+    const knot_dname_t *name;
+    struct kr_context *ctx;
+	/* beware: hidden stub */
+};
 struct kr_query {
     struct kr_query *parent;
     knot_dname_t *sname;
@@ -142,6 +149,8 @@ struct kr_query {
     uint16_t reorder;
     struct timeval timestamp;
     struct kr_zonecut zone_cut;
+    struct kr_nsrep ns;
+	/* ^hidden stub^ */
 	char _stub[];
 };
 struct kr_context {
diff --git a/daemon/lua/kres-gen.sh b/daemon/lua/kres-gen.sh
index dd803c06f..124853543 100755
--- a/daemon/lua/kres-gen.sh
+++ b/daemon/lua/kres-gen.sh
@@ -52,8 +52,11 @@ genResType "struct knot_rrset" | sed 's/\<owner\>/_owner/'
 
 ## Some definitions would need too many deps, so shorten them.
 
-genResType "struct kr_query" | sed '/struct kr_nsrep/,$ d'
-printf "\tchar _stub[];\n};\n"
+genResType "struct kr_nsrep" | sed '/union/,$ d'
+printf "\t/* beware: hidden stub */\n};\n"
+
+genResType "struct kr_query" | sed '/struct kr_layer_pickle/,$ d'
+printf "\t/* ^hidden stub^ */\n\tchar _stub[];\n};\n"
 
 genResType "struct kr_context" | sed '/struct kr_cache/,$ d'
 printf "\tchar _stub[];\n};\n"
diff --git a/modules/workarounds/workarounds.lua b/modules/workarounds/workarounds.lua
index 255fe7848..51cf3c087 100644
--- a/modules/workarounds/workarounds.lua
+++ b/modules/workarounds/workarounds.lua
@@ -16,5 +16,29 @@ function M.config()
 	}))
 end
 
+-- Issue #139: When asking NSs of certain turktelekom names for PTR, disable 0x20.
+-- Just listing the *.in-addr.arpa suffixes would be tedious, as there are many.
+M.layer = {
+	produce = function (state, req)
+		local req = kres.request_t(req)
+		local qry = req:current()
+		if qry.stype ~= kres.type.PTR
+			or bit.band(state, bit.bor(kres.FAIL, kres.DONE)) ~= 0
+			then return state -- quick exit in most cases
+		end
+		if qry:hasflag(kres.query.AWAIT_CUT) or qry.ns.name == nil
+			then return state end
+		local name = kres.dname2str(qry.ns.name)
+		-- The problematic nameservers: rdnsN.turktelekom.com.tr.
+		if name and string.sub(name, 6) == '.turktelekom.com.tr.' then
+			qry.flags = bit.bor(qry.flags,
+							bit.bor(kres.query.NO_0X20, kres.query.NO_MINIMIZE))
+			-- ^ NO_MINIMIZE isn't required for success, as kresd will retry
+			-- after getting refused, but it will speed things up.
+		end
+		return state
+	end,
+}
+
 return M
 
-- 
2.47.3