From b42195a256ee2c5dd8d55c1e68215fdb5288caa4 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Vladim=C3=ADr=20=C4=8Cun=C3=A1t?= <vladimir.cunat@nic.cz>
Date: Fri, 6 Sep 2019 12:10:12 +0200
Subject: [PATCH] lua bindings: compatibility with both libknot versions

---
 daemon/lua/kres-gen.lua |  8 --------
 daemon/lua/kres-gen.sh  |  4 ++--
 daemon/lua/kres.lua     | 34 ++++++++++++++++++++++++++++++++++
 3 files changed, 36 insertions(+), 10 deletions(-)

diff --git a/daemon/lua/kres-gen.lua b/daemon/lua/kres-gen.lua
index 07647cc84..ed48d753e 100644
--- a/daemon/lua/kres-gen.lua
+++ b/daemon/lua/kres-gen.lua
@@ -22,14 +22,6 @@ typedef struct {
 	uint16_t compress_ptr[16];
 } knot_rrinfo_t;
 typedef unsigned char knot_dname_t;
-typedef struct {
-	uint16_t len;
-	uint8_t data[];
-} knot_rdata_t;
-typedef struct {
-	uint16_t count;
-	knot_rdata_t *rdata;
-} knot_rdataset_t;
 typedef struct {
 	knot_dname_t *_owner;
 	uint32_t _ttl;
diff --git a/daemon/lua/kres-gen.sh b/daemon/lua/kres-gen.sh
index c28d346f2..fd16e492c 100755
--- a/daemon/lua/kres-gen.sh
+++ b/daemon/lua/kres-gen.sh
@@ -75,8 +75,8 @@ ${CDEFS} ${LIBKRES} types <<-EOF
 	knot_section_t
 	knot_rrinfo_t
 	knot_dname_t
-	knot_rdata_t
-	knot_rdataset_t
+	#knot_rdata_t
+	#knot_rdataset_t
 EOF
 
 genResType() {
diff --git a/daemon/lua/kres.lua b/daemon/lua/kres.lua
index 2fc21503f..5198c2fcd 100644
--- a/daemon/lua/kres.lua
+++ b/daemon/lua/kres.lua
@@ -57,6 +57,40 @@ int inet_pton(int af, const char *src, void *dst);
 int gettimeofday(struct timeval *tv, struct timezone *tz);
 ]]
 
+
+-- TMP: compatibility with both libknot 2.8 and 2.9
+local knot_rdataset_t_cdef
+local sover_pos = string.find(libknot_SONAME, '%d')
+if not sover_pos then
+	error('unexpected libknot soname: ' .. libknot_SONAME)
+end
+local sover = string.sub(libknot_SONAME, sover_pos , sover_pos)
+if sover == '8' then
+	knot_rdataset_t_cdef = [[
+		typedef struct {
+			uint16_t count;
+			knot_rdata_t *rdata;
+		} knot_rdataset_t;
+	]]
+elseif sover == '9' then
+	knot_rdataset_t_cdef = [[
+		typedef struct {
+			uint16_t count;
+			uint32_t size;
+			knot_rdata_t *rdata;
+		} knot_rdataset_t;
+	]]
+else
+	error('unexpected libknot version: ' .. sover)
+end
+ffi.cdef([[
+		typedef struct {
+			uint16_t len;
+			uint8_t data[];
+		} knot_rdata_t;
+	]] .. knot_rdataset_t_cdef)
+
+
 require('kres-gen')
 
 -- Error code representation
-- 
2.47.2