From 97cbe3c1b122366dcfeed65b039024870857704a Mon Sep 17 00:00:00 2001
From: Sebastian Harl <sh@tokkee.org>
Date: Sun, 5 Oct 2014 19:50:20 +0200
Subject: [PATCH] store_lookup: Fixed lookup by back-end name.

Added an integration test which reproduces the problem -- previously, all
compare operations reported a mismatch.
---
 src/core/store_lookup.c         | 26 +++++++++++++++++---------
 t/integration/simple_query.sh   | 12 ++++++++++++
 t/unit/core/store_lookup_test.c |  6 ++++++
 3 files changed, 35 insertions(+), 9 deletions(-)

diff --git a/src/core/store_lookup.c b/src/core/store_lookup.c
index d53bd58..9176592 100644
--- a/src/core/store_lookup.c
+++ b/src/core/store_lookup.c
@@ -136,19 +136,17 @@ obj_cmp(sdb_store_obj_t *obj, sdb_store_cond_t *cond,
 	sdb_data_t value = SDB_DATA_INIT;
 	int status;
 
-	if (sdb_store_get_field(obj, OBJ_C(cond)->field, &obj_value))
-		return INT_MAX;
 	if (sdb_store_expr_eval(OBJ_C(cond)->expr, obj, &value))
 		return INT_MAX;
 
-	if (obj_value.type != value.type) {
-		sdb_data_free_datum(&value);
-		return INT_MAX;
-	}
-	else if (OBJ_C(cond)->field == SDB_FIELD_BACKEND) {
+	if (OBJ_C(cond)->field == SDB_FIELD_BACKEND) {
 		/* this implementation is not actually a conditional but rather checks
 		 * for equality (or rather, existence) only */
 		size_t i;
+
+		if (value.type != SDB_TYPE_STRING)
+			return INT_MAX;
+
 		status = INT_MAX;
 		for (i = 0; i < obj->backends_num; ++i) {
 			if (! strcasecmp(obj->backends[i], value.data.string)) {
@@ -156,10 +154,20 @@ obj_cmp(sdb_store_obj_t *obj, sdb_store_cond_t *cond,
 				break;
 			}
 		}
+		sdb_data_free_datum(&value);
+		return status;
 	}
-	else {
-		status = sdb_data_cmp(&obj_value, &value);
+
+	if (sdb_store_get_field(obj, OBJ_C(cond)->field, &obj_value))
+		return INT_MAX;
+	if (obj_value.type != value.type) {
+		sdb_data_free_datum(&obj_value);
+		sdb_data_free_datum(&value);
+		return INT_MAX;
 	}
+
+	status = sdb_data_cmp(&obj_value, &value);
+	sdb_data_free_datum(&obj_value);
 	sdb_data_free_datum(&value);
 	return status;
 } /* obj_cmp */
diff --git a/t/integration/simple_query.sh b/t/integration/simple_query.sh
index b639443..35a55ce 100755
--- a/t/integration/simple_query.sh
+++ b/t/integration/simple_query.sh
@@ -152,6 +152,18 @@ output="$( run_sysdb -H "$SOCKET_FILE" \
 		FILTER :last_update < 2Y" )"
 echo $output | grep -E '^\[\]$'
 
+output="$( run_sysdb -H "$SOCKET_FILE" \
+	-c "LOOKUP hosts FILTER :backend = 'backend::mock_plugin'" )"
+echo "$output" \
+	| grep -F '"host1.example.com"' \
+	| grep -F '"host2.example.com"' \
+	| grep -F '"localhost"' \
+	| grep -F '"other.host.name"' \
+	| grep -F '"some.host.name"'
+output="$( run_sysdb -H "$SOCKET_FILE" \
+	-c "LOOKUP hosts FILTER :backend = 'invalid'" )"
+echo $output | grep -E '^\[\]$'
+
 output="$( run_sysdb -H "$SOCKET_FILE" \
 	-c "LOOKUP hosts MATCHING service = 'sysdbd'" )"
 echo "$output" | grep -F '"localhost"'
diff --git a/t/unit/core/store_lookup_test.c b/t/unit/core/store_lookup_test.c
index 754eb13..13861bb 100644
--- a/t/unit/core/store_lookup_test.c
+++ b/t/unit/core/store_lookup_test.c
@@ -394,6 +394,12 @@ START_TEST(test_obj_cond)
 			{ SDB_TYPE_INTEGER, { .integer = 0 } }, 0, 0, 0, 0, 0 },
 		{ "a", SDB_FIELD_BACKEND,
 			{ SDB_TYPE_INTEGER, { .integer = 0 } }, 0, 0, 0, 0, 0 },
+		{ "a", SDB_FIELD_BACKEND,
+			{ SDB_TYPE_INTEGER, { .integer = 0 } }, 0, 0, 0, 0, 0 },
+		/* (64bit) integer value without zero-bytes */
+		{ "a", SDB_FIELD_BACKEND,
+			{ SDB_TYPE_INTEGER, { .integer = 0xffffffffffffffffL } },
+			0, 0, 0, 0, 0 },
 	};
 
 	int status;
-- 
2.30.2