Implement #link_local? methods

2 files changed, 28 insertions, 0 deletions

diff --git a/lib/ipaddress/ipv4.rb b/lib/ipaddress/ipv4.rb
index a123e71..a6bea7b 100644
--- a/lib/ipaddress/ipv4.rb
+++ b/lib/ipaddress/ipv4.rb
@@ -649,6 +649,20 @@ module IPAddress;
     end
 
     #
+    # Checks if an IPv4 address objects belongs
+    # to a link-local network RFC3927
+    #
+    # Example:
+    #
+    #   ip = IPAddress "169.254.0.1"
+    #   ip.link_local?
+    #     #=> true
+    #
+    def link_local?
+      [self.class.new("169.254.0.0/16")].any? {|i| i.include? self}
+    end
+
+    #
     # Returns the IP address in in-addr.arpa format
     # for DNS lookups
     #
diff --git a/lib/ipaddress/ipv6.rb b/lib/ipaddress/ipv6.rb
index 6ae651d..57ed143 100644
--- a/lib/ipaddress/ipv6.rb
+++ b/lib/ipaddress/ipv6.rb
@@ -422,6 +422,20 @@ module IPAddress;
       @prefix == 128 and @compressed == "::1"
     end
 
+    #
+    # Checks if an IPv4 address objects belongs
+    # to a link-local network RFC4291
+    #
+    # Example:
+    #
+    #   ip = IPAddress "fe80::1"
+    #   ip.link_local?
+    #     #=> true
+    #
+    def link_local?
+      [self.class.new("fe80::/64")].any? {|i| i.include? self}
+    end
+
     # 
     # Returns true if the address is a mapped address
     #