Put in the skeleton around the auto wiring functionality

ChangeLog

@@ -1,3 +1,11 @@
+2017-01-07  Johnathan Sharratt <johnathan.sharratt@gmail.com>
+
+    * Version 0.2.6
+
+        * Added a feature that will automatically create route entries
+          in the routing tables, thus providing an alternative to this
+          https://github.com/google/ndprbrd projects use-case.
+
 2016-04-18  Daniel Adolfsson  <daniel@priv.nu>
 
     * Version 0.2.5

ndppd.conf-dist

@@ -23,6 +23,13 @@ proxy eth0 {
 
    timeout 500   
 
+   # auto-wire <yes|no|true|false>
+   # Controls whether whether ndppd will automatically create host entries
+   # in the routing tables when it receives Neighbor Advertisements on a
+   # listening interface. The the default value is no.
+
+   auto-wire no
+   
    # ttl <integer>
    # Controls how long a valid or invalid entry remains in the cache, in 
    # milliseconds. Default value is '30000' (30 seconds).

ndppd.conf.5

@@ -48,6 +48,12 @@ Controls how long
 .B ndppd
 will cache an entry. This is in milliseconds, and the default value 
 is 30000 (30 seconds).
+.IP "auto-wire <yes|no>"
+Controls whether
+.B ndppd
+will automatically create host entries in the routing tables when
+.B ndppd receives Neighbor Advertisements on a listening interface.
+The default value is no.
 .IP "timeout <value>"
 Controls how long
 .B ndppd

src/iface.cc

@@ -589,7 +589,7 @@ int iface::poll_all()
                 const ptr<session> sess = *s_it;
 
                 if ((sess->taddr() == taddr) && (sess->status() == session::WAITING)) {
-                    sess->handle_advert();
+                    sess->handle_advert(ifa);
                     break;
                 }
             }

src/ndppd.cc

@@ -160,6 +160,11 @@ static bool configure(ptr<conf>& cf)
         else
             pr->router(*x_cf);
         
+        if (!(x_cf = pr_cf->find("autowire")))
+            pr->autowire(false);
+        else
+            pr->autowire(*x_cf);
+
         if (!(x_cf = pr_cf->find("ttl")))
             pr->ttl(30000);
         else

src/proxy.cc

@@ -30,7 +30,7 @@ NDPPD_NS_BEGIN
 std::list<ptr<proxy> > proxy::_list;
 
 proxy::proxy() :
-    _router(true), _ttl(30000), _timeout(500)
+    _router(true), _ttl(30000), _timeout(500), _autowire(false)
 {
 }
 
@@ -104,7 +104,7 @@ void proxy::handle_solicit(const address& saddr, const address& daddr,
 
         if (ru->addr() == taddr) {
             if (!se) {
-                se = session::create(_ptr, saddr, daddr, taddr);
+                se = session::create(_ptr, saddr, daddr, taddr, _autowire);
             }
 
             if (ru->is_auto()) {
@@ -130,7 +130,7 @@ void proxy::handle_solicit(const address& saddr, const address& daddr,
                 if (if_addr_find((*it)->ifa()->name(), &taddr.const_addr())) {
                     logger::debug() << "Sending NA out " << (*it)->ifa()->name();
                     se->add_iface(_ifa);
-                    se->handle_advert();
+                    se->handle_advert(_ifa);
                 }
                 #endif
             }
@@ -177,6 +177,16 @@ void proxy::router(bool val)
     _router = val;
 }
 
+bool proxy::autowire() const
+{
+    return _autowire;
+}
+
+void proxy::autowire(bool val)
+{
+    _autowire = val;
+}
+
 int proxy::ttl() const
 {
     return _ttl;

src/proxy.h

@@ -49,6 +49,10 @@ public:
 
     void router(bool val);
     
+    bool autowire() const;
+
+    void autowire(bool val);
+
     int timeout() const;
 
     void timeout(int val);
@@ -70,6 +74,8 @@ private:
 
     bool _router;
     
+    bool _autowire;
+
     int _ttl, _timeout;
 
     proxy();

src/session.cc

@@ -65,7 +65,7 @@ session::~session()
 }
 
 ptr<session> session::create(const ptr<proxy>& pr, const address& saddr,
-    const address& daddr, const address& taddr)
+    const address& daddr, const address& taddr, bool auto_wire)
 {
     ptr<session> se(new session());
 
@@ -74,6 +74,7 @@ ptr<session> session::create(const ptr<proxy>& pr, const address& saddr,
     se->_saddr    = address("::") == saddr ? all_nodes : saddr;
     se->_taddr    = taddr;
     se->_daddr    = daddr;
+    se->_autowire = auto_wire;
     se->_ttl      = pr->timeout();
 
     _sessions.push_back(se);
@@ -110,6 +111,23 @@ void session::send_advert()
     _pr->ifa()->write_advert(_saddr, _taddr, _pr->router());
 }
 
+void session::handle_auto_wire(const ptr<iface>& ifa)
+{
+    logger::debug()
+        << "session::handle_auto_wire() taddr=" << _taddr << ", ifa=" << ifa->name();
+    
+    logger::debug() << "session::handle_auto_wire()";
+}
+
+void session::handle_advert(const ptr<iface>& ifa)
+{
+    if (_autowire == true) {
+        handle_auto_wire(ifa);
+    }
+    
+    handle_advert();
+}
+
 void session::handle_advert()
 {
     _status = VALID;
@@ -133,6 +151,11 @@ const address& session::daddr() const
     return _daddr;
 }
 
+bool session::autowire() const
+{
+    return _autowire;
+}
+
 int session::status() const
 {
     return _status;

src/session.h

@@ -32,6 +32,8 @@ private:
 
     address _saddr, _daddr, _taddr;
     
+    bool _autowire;
+
     // An array of interfaces this session is monitoring for
     // ND_NEIGHBOR_ADVERT on.
     std::list<ptr<iface> > _ifaces;
@@ -58,7 +60,7 @@ public:
     ~session();
 
     static ptr<session> create(const ptr<proxy>& pr, const address& saddr,
-        const address& daddr, const address& taddr);
+        const address& daddr, const address& taddr, bool autowire);
 
     void add_iface(const ptr<iface>& ifa);
 
@@ -68,12 +70,18 @@ public:
 
     const address& saddr() const;
     
+    bool autowire() const;
+
     int status() const;
 
     void status(int val);
 
     void handle_advert();
     
+    void handle_advert(const ptr<iface>& ifa);
+    
+    void handle_auto_wire(const ptr<iface>& ifa);
+
     void send_advert();
 
     void send_solicit();