[3512] Addressed review comments.

src/lib/dhcp/tests/iface_mgr_unittest.cc

@@ -614,6 +614,7 @@ TEST_F(IfaceMgrTest, ifaceHasAddress) {
     Iface* iface = IfaceMgr::instance().getIface("eth0");
     ASSERT_FALSE(iface == NULL);
     EXPECT_TRUE(iface->hasAddress(IOAddress("10.0.0.1")));
+    EXPECT_FALSE(iface->hasAddress(IOAddress("10.0.0.2")));
     EXPECT_TRUE(iface->hasAddress(IOAddress("fe80::3a60:77ff:fed5:cdef")));
     EXPECT_TRUE(iface->hasAddress(IOAddress("2001:db8:1::1")));
     EXPECT_FALSE(iface->hasAddress(IOAddress("2001:db8:1::2")));

src/lib/dhcpsrv/cfg_iface.cc

@@ -237,6 +237,13 @@ CfgIface::use(const std::string& iface_name) {
                       " a valid IPv6 unicast address");
         }
 
+        // There are valid cases where link local address can be specified to
+        // receive unicast traffic, e.g. sent by relay agent.
+        if (addr.isV6LinkLocal()) {
+            LOG_WARN(dhcpsrv_logger, DHCPSRV_CFGMGR_UNICAST_LINK_LOCAL)
+                .arg(addr.toText()).arg(name);
+        }
+
         // Interface must have this address assigned.
         if (!iface->hasAddress(addr)) {
             isc_throw(NoSuchAddress,

src/lib/dhcpsrv/cfg_iface.h

@@ -176,17 +176,22 @@ private:
 
     /// @brief Protocol family.
     Family family_;
+
     /// @brief Represents a set of interface names.
     typedef std::set<std::string> IfaceSet;
+
     /// @brief A set of interface names specified by the user.
     IfaceSet iface_set_;
+
     /// @brief A map of interfaces and unicast addresses.
     typedef std::map<std::string, asiolink::IOAddress> UnicastMap;
+
     /// @brief A map which holds the pairs of interface names and unicast
     /// addresses for which the unicast sockets should be opened.
     ///
     /// This is only used for V6 family.
     UnicastMap unicast_map_;
+
     /// @brief A booolean value which indicates that the wildcard interface name
     /// has been specified (*).
     bool wildcard_used_;

src/lib/dhcpsrv/dhcpsrv_messages.mes

@@ -145,6 +145,11 @@ This is a debug message reporting that the DHCP configuration manager has
 returned the specified IPv6 subnet, because detected relay agent address
 matches value specified for this subnet.
 
+% DHCPSRV_CFGMGR_UNICAST_LINK_LOCAL specified link local address %1 for unicast traffic on interface %2
+This warning message is logged when user specified a link-local address to
+receive unicast traffic. The warning message is issued because it is an
+uncommon use.
+
 % DHCPSRV_CLOSE_DB closing currently open %1 database
 This is a debug message, issued when the DHCP server closes the currently
 open lease database.  It is issued at program shutdown and whenever

src/lib/dhcpsrv/tests/cfg_iface_unittest.cc

@@ -146,7 +146,7 @@ TEST_F(CfgIfaceTest, explicitNamesV6) {
 // select all interfaces to open IPv4 sockets.
 TEST_F(CfgIfaceTest, wildcardV4) {
     CfgIface cfg(CfgIface::V4);
-    ASSERT_NO_THROW(cfg.use(CfgIface::ALL_IFACES_KEYWORD));
+    ASSERT_NO_THROW(cfg.use("*"));
 
     cfg.openSockets(DHCP4_SERVER_PORT);
 
@@ -165,7 +165,7 @@ TEST_F(CfgIfaceTest, wildcardV4) {
 // select all interfaces to open IPv6 sockets.
 TEST_F(CfgIfaceTest, wildcardV6) {
     CfgIface cfg(CfgIface::V6);
-    ASSERT_NO_THROW(cfg.use(CfgIface::ALL_IFACES_KEYWORD));
+    ASSERT_NO_THROW(cfg.use("*"));
 
     cfg.openSockets(DHCP4_SERVER_PORT);
 
@@ -219,8 +219,8 @@ TEST_F(CfgIfaceTest, invalidValues) {
     ASSERT_THROW(cfg.use("eth0/fe80::3a60:77ff:fed5:cdef"), InvalidIfaceName);
     ASSERT_THROW(cfg.use("eth0/2001:db8:1::2"), NoSuchAddress);
 
-    ASSERT_NO_THROW(cfg.use(CfgIface::ALL_IFACES_KEYWORD));
-    ASSERT_THROW(cfg.use(CfgIface::ALL_IFACES_KEYWORD), DuplicateIfaceName);
+    ASSERT_NO_THROW(cfg.use("*"));
+    ASSERT_THROW(cfg.use("*"), DuplicateIfaceName);
 }
 
 } // end of anonymous namespace