[3389a] Rebased (but still many things to do)

doc/examples/kea4/advanced.json

@@ -29,7 +29,11 @@
         // 'udp' is generally better if you have only relayed traffic. Kea
         // than opens up normal UDP socket and the kernel does all the
         // Ethernet/IP stack processing.
-        "dhcp-socket-type": "udp"
+        "dhcp-socket-type": "udp",
+
+	// This makes interfaces to be re-detected at each (re-)configuration.
+	// By default it is true.
+	"re-detect": true
     },
 
     // We need to specify the the database used to store leases. As of

doc/examples/kea6/advanced.json

@@ -16,7 +16,11 @@
 {
   // Kea is told to listen on ethX network interface only.
   "interfaces-config": {
-    "interfaces": [ "ethX" ]
+    "interfaces": [ "ethX" ],
+
+	// This makes interfaces to be re-detected at each (re-)configuration.
+	// By default it is true.
+	"re-detect": true
   },
 
   // We need to specify the the database used to store leases. As of

src/bin/dhcp4/dhcp4_lexer.ll

@@ -226,6 +226,15 @@ ControlCharacterFill            [^"\\]|\\{JSONEscapeSequence}
     }
 }
 
+\"re-detect\" {
+    switch(driver.ctx_) {
+    case isc::dhcp::Parser4Context::INTERFACES_CONFIG:
+        return  isc::dhcp::Dhcp4Parser::make_RE_DETECT(driver.loc_);
+    default:
+        return isc::dhcp::Dhcp4Parser::make_STRING("re-detect", driver.loc_);
+    }
+}
+
 \"lease-database\" {
     switch(driver.ctx_) {
     case isc::dhcp::Parser4Context::DHCP4:

src/bin/dhcp4/dhcp4_parser.yy

@@ -55,6 +55,7 @@ using namespace std;
   DHCP_SOCKET_TYPE "dhcp-socket-type"
   RAW "raw"
   UDP "udp"
+  RE_DETECT "re-detect"
 
   ECHO_CLIENT_ID "echo-client-id"
   MATCH_CLIENT_ID "match-client-id"
@@ -456,6 +457,7 @@ interfaces_config_params: interfaces_config_param
 
 interfaces_config_param: interfaces_list
                        | dhcp_socket_type
+                       | re_detect
                        ;
 
 sub_interfaces4: LCURLY_BRACKET {
@@ -487,6 +489,12 @@ socket_type: RAW { $$ = ElementPtr(new StringElement("raw", ctx.loc2pos(@1))); }
            | UDP { $$ = ElementPtr(new StringElement("udp", ctx.loc2pos(@1))); }
            ;
 
+re_detect: RE_DETECT COLON BOOLEAN {
+    ElementPtr b(new BoolElement($3, ctx.loc2pos(@3)));
+    ctx.stack_.back()->set("re-detect", b);
+};
+
+
 lease_database: LEASE_DATABASE {
     ElementPtr i(new MapElement(ctx.loc2pos(@1)));
     ctx.stack_.back()->set("lease-database", i);

src/bin/dhcp6/dhcp6_lexer.ll

@@ -416,6 +416,15 @@ ControlCharacterFill            [^"\\]|\\{JSONEscapeSequence}
     }
 }
 
+\"re-detect\" {
+    switch(driver.ctx_) {
+    case isc::dhcp::Parser6Context::INTERFACES_CONFIG:
+        return  isc::dhcp::Dhcp6Parser::make_RE_DETECT(driver.loc_);
+    default:
+        return isc::dhcp::Dhcp6Parser::make_STRING("re-detect", driver.loc_);
+    }
+}
+
 \"lease-database\" {
     switch(driver.ctx_) {
     case isc::dhcp::Parser6Context::DHCP6:

src/bin/dhcp6/dhcp6_parser.yy

@@ -52,6 +52,7 @@ using namespace std;
   DHCP6 "Dhcp6"
   INTERFACES_CONFIG "interfaces-config"
   INTERFACES "interfaces"
+  RE_DETECT "re-detect"
 
   LEASE_DATABASE "lease-database"
   HOSTS_DATABASE "hosts-database"
@@ -449,7 +450,7 @@ interfaces_config: INTERFACES_CONFIG {
     ctx.stack_.back()->set("interfaces-config", i);
     ctx.stack_.push_back(i);
     ctx.enter(ctx.INTERFACES_CONFIG);
-} COLON LCURLY_BRACKET interface_config_map RCURLY_BRACKET {
+} COLON LCURLY_BRACKET interfaces_config_params RCURLY_BRACKET {
     ctx.stack_.pop_back();
     ctx.leave();
 };
@@ -458,11 +459,19 @@ sub_interfaces6: LCURLY_BRACKET {
     // Parse the interfaces-config map
     ElementPtr m(new MapElement(ctx.loc2pos(@1)));
     ctx.stack_.push_back(m);
-} interface_config_map RCURLY_BRACKET {
+} interfaces_config_params RCURLY_BRACKET {
     // parsing completed
 };
 
-interface_config_map: INTERFACES {
+interfaces_config_params: interfaces_config_param
+                        | interfaces_config_params COMMA interfaces_config_param
+                        ;
+
+interfaces_config_param: interfaces_list
+                       | re_detect
+                       ;
+
+interfaces_list: INTERFACES {
     ElementPtr l(new ListElement(ctx.loc2pos(@1)));
     ctx.stack_.back()->set("interfaces", l);
     ctx.stack_.push_back(l);
@@ -472,6 +481,12 @@ interface_config_map: INTERFACES {
     ctx.leave();
 };
 
+re_detect: RE_DETECT COLON BOOLEAN {
+    ElementPtr b(new BoolElement($3, ctx.loc2pos(@3)));
+    ctx.stack_.back()->set("re-detect", b);
+};
+
+
 lease_database: LEASE_DATABASE {
     ElementPtr i(new MapElement(ctx.loc2pos(@1)));
     ctx.stack_.back()->set("lease-database", i);

src/lib/dhcpsrv/parsers/ifaces_config_parser.cc

-// Copyright (C) 2015 Internet Systems Consortium, Inc. ("ISC")
+// Copyright (C) 2015,2017 Internet Systems Consortium, Inc. ("ISC")
 //
 // This Source Code Form is subject to the terms of the Mozilla Public
 // License, v. 2.0. If a copy of the MPL was not distributed with this
@@ -20,7 +20,7 @@ namespace dhcp {
 
 void
 IfacesConfigParser::parseInterfacesList(const CfgIfacePtr& cfg_iface,
-                                           ConstElementPtr ifaces_list) {
+                                        ConstElementPtr ifaces_list) {
     BOOST_FOREACH(ConstElementPtr iface, ifaces_list->listValue()) {
         std::string iface_name = iface->stringValue();
         try {
@@ -45,6 +45,15 @@ IfacesConfigParser::parse(const CfgIfacePtr& cfg,
     bool socket_type_specified = false;
     BOOST_FOREACH(ConfigPair element, ifaces_config->mapValue()) {
         try {
+            // Check for re-detect before calling parseInterfacesList() 
+            if (element.first == "re-detect") {
+                if (element.second->boolValue()) {
+                    IfaceMgr::instance().clearIfaces();
+                    IfaceMgr::instance().detectIfaces();
+                }
+                continue;
+            }
+
             if (element.first == "interfaces") {
                 parseInterfacesList(cfg, element.second);
                 continue;