From 4736e8e666272dec9b54f27287470769dfabd4f9 Mon Sep 17 00:00:00 2001
From: Daniel Larimer <dlarimer@gmail.com>
Date: Tue, 23 Jul 2013 01:07:19 -0400
Subject: [PATCH] adding methods to detect multicast and public ip ranges

---
 include/fc/network/ip.hpp | 19 ++++++++++++++++++
 src/network/ip.cpp        | 42 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 61 insertions(+)

diff --git a/include/fc/network/ip.hpp b/include/fc/network/ip.hpp
index 56ee2e6..900c89a 100644
--- a/include/fc/network/ip.hpp
+++ b/include/fc/network/ip.hpp
@@ -17,6 +17,24 @@ namespace fc {
 
         friend bool operator==( const address& a, const address& b );
         friend bool operator!=( const address& a, const address& b );
+
+        /**
+         *  @return true if the ip is in the following ranges:
+         *
+         *  10.0.0.0    to 10.255.255.255
+         *  172.16.0.0  to 172.31.255.255
+         *  192.168.0.0 to 192.168.255.255
+         *  169.254.0.0 to 169.254.255.255
+         *
+         */
+        bool is_private_address()const;
+        /**
+         *  224.0.0.0 to 239.255.255.255
+         */
+        bool is_multicast_address()const;
+
+        /** !private & !multicast */
+        bool is_public_address()const;
       private:
         uint32_t _ip;
     };
@@ -50,6 +68,7 @@ namespace fc {
         uint32_t _port; 
         address  _ip;
     };
+
   }
   class variant;
   void to_variant( const ip::endpoint& var,  variant& vo );
diff --git a/src/network/ip.cpp b/src/network/ip.cpp
index 7560cbe..81da0df 100644
--- a/src/network/ip.cpp
+++ b/src/network/ip.cpp
@@ -69,6 +69,48 @@ namespace fc { namespace ip {
     return string(_ip) + ':' + fc::string(boost::lexical_cast<std::string>(_port).c_str());
   }
 
+  /**
+   *  @return true if the ip is in the following ranges:
+   *
+   *  10.0.0.0    to 10.255.255.255
+   *  172.16.0.0  to 172.31.255.255
+   *  192.168.0.0 to 192.168.255.255
+   *  169.254.0.0 to 169.254.255.255
+   *
+   */
+  bool address::is_private_address()const
+  {
+    static address min10_ip("10.0.0.0");
+    static address max10_ip("10.255.255.255");
+    static address min172_ip("172.16.0.0");
+    static address max172_ip("172.31.255.255");
+    static address min192_ip("192.168.0.0");
+    static address max192_ip("192.168.255.255");
+    static address min169_ip("169.254.0.0");
+    static address max169_ip("169.254.255.255");
+    if( _ip >= min10_ip._ip && _ip <= max10_ip._ip ) return true;
+    if( _ip >= min172_ip._ip && _ip <= max172_ip._ip ) return true;
+    if( _ip >= min192_ip._ip && _ip <= max192_ip._ip ) return true;
+    if( _ip >= min169_ip._ip && _ip <= max169_ip._ip ) return true;
+    return false;
+  }
+
+  /**
+   *  224.0.0.0 to 239.255.255.255
+   */
+  bool address::is_multicast_address()const
+  {
+    static address min_ip("224.0.0.0");
+    static address max_ip("239.255.255.255");
+    return  _ip >= min_ip._ip  && _ip <= max_ip._ip;
+  }
+
+  /** !private & !multicast */
+  bool address::is_public_address()const
+  {
+    return !( is_private_address() || is_multicast_address() );
+  }
+
 }  // namespace ip
 
   void to_variant( const ip::endpoint& var,  variant& vo )