[2414] CfgMgr now returns a subnet if a client is local.

src/lib/dhcp/cfgmgr.cc

@@ -41,7 +41,7 @@ CfgMgr::getSubnet6(const isc::asiolink::IOAddress& hint) {
     // configuration. Such requirement makes sense in IPv4, but not in IPv6.
     // The server does not need to have a global address (using just link-local
     // is ok for DHCPv6 server) from the pool it serves.
-    if (subnets6_.size() == 1) {
+    if ( (subnets6_.size() == 1) && hint.getAddress().to_v6().is_link_local()) {
         return (subnets6_[0]);
     }
 

src/lib/dhcp/tests/cfgmgr_unittest.cc

@@ -32,13 +32,22 @@ using boost::scoped_ptr;
 
 namespace {
 
+class CfgMgrTest : public ::testing::Test {
+public:
+    CfgMgrTest() {
+    }
+
+    ~CfgMgrTest() {
+        CfgMgr::instance().deleteSubnets6();
+    }
+};
+
+
 // This test verifies if the configuration manager is able to hold and return
 // valid leases
-TEST(CfgMgrTest, subnet4) {
+TEST_F(CfgMgrTest, subnet4) {
     CfgMgr& cfg_mgr = CfgMgr::instance();
 
-    ASSERT_TRUE(&cfg_mgr != 0);
-
     Subnet4Ptr subnet1(new Subnet4(IOAddress("192.0.2.0"), 26, 1, 2, 3));
     Subnet4Ptr subnet2(new Subnet4(IOAddress("192.0.2.64"), 26, 1, 2, 3));
     Subnet4Ptr subnet3(new Subnet4(IOAddress("192.0.2.128"), 26, 1, 2, 3));
@@ -66,11 +75,9 @@ TEST(CfgMgrTest, subnet4) {
 
 // This test verifies if the configuration manager is able to hold and return
 // valid leases
-TEST(CfgMgrTest, subnet6) {
+TEST_F(CfgMgrTest, subnet6) {
     CfgMgr& cfg_mgr = CfgMgr::instance();
 
-    ASSERT_TRUE(&cfg_mgr != 0);
-
     Subnet6Ptr subnet1(new Subnet6(IOAddress("2000::"), 48, 1, 2, 3, 4));
     Subnet6Ptr subnet2(new Subnet6(IOAddress("3000::"), 48, 1, 2, 3, 4));
     Subnet6Ptr subnet3(new Subnet6(IOAddress("4000::"), 48, 1, 2, 3, 4));
@@ -83,6 +90,10 @@ TEST(CfgMgrTest, subnet6) {
     // Now we have only one subnet, any request will be served from it
     EXPECT_EQ(subnet1, cfg_mgr.getSubnet6(IOAddress("2000::1")));
 
+    // If we have only a single subnet and the request came from a local
+    // address, let's use that subnet
+    EXPECT_EQ(subnet1, cfg_mgr.getSubnet6(IOAddress("fe80::dead:beef")));
+
     cfg_mgr.addSubnet6(subnet2);
     cfg_mgr.addSubnet6(subnet3);