add Socket.getaddrinfo.

test/ipsocket.rb

@@ -0,0 +1,40 @@
+# Note: most of tests below will fail if UDPSocket is broken.
+
+assert('IPSocket.getaddress') do
+  l = IPSocket.getaddress("localhost")
+  assert_true (l == "127.0.0.1" or l == "::1")
+end
+
+assert('IPSocket.addr') do
+  localhost = "127.0.0.1"
+  s = UDPSocket.new
+  s.bind(localhost, 0)
+  port = Addrinfo.new(s.getsockname).ip_port
+
+  a = s.addr
+  assert_equal "AF_INET", a[0]
+  assert_equal port,      a[1]
+  assert_equal localhost, a[2]
+  assert_equal localhost, a[3]
+  s.close
+  true
+end
+
+assert('IPSocket.peeraddr') do
+  localhost = "127.0.0.1"
+  server = UDPSocket.new
+  server.bind(localhost, 0)
+  port = server.local_address.ip_port
+
+  client = UDPSocket.new
+  client.connect(localhost, port)
+
+  a = client.peeraddr
+  assert_equal "AF_INET", a[0]
+  assert_equal port,      a[1]
+  assert_equal localhost, a[2]
+  assert_equal localhost, a[3]
+  client.close
+  server.close
+  true
+end

test/socket.rb

@@ -133,3 +133,16 @@ assert('Socket.gethostname') do
   assert_true(Socket.gethostname.is_a? String)
 end
 
+assert('Socket::getaddrinfo') do
+  ret = Socket.getaddrinfo("localhost", "domain", Socket::AF_INET, Socket::SOCK_DGRAM)
+  assert_true ret.size >= 1
+  a = ret[0]
+  assert_equal "AF_INET",           a[0]
+  assert_equal 53,                  a[1]
+  # documents says it's a hostname but CRuby returns an address
+  #assert_equal "127.0.0.1",         a[2]
+  assert_equal "127.0.0.1",         a[3]
+  assert_equal Socket::AF_INET,     a[4]
+  assert_equal Socket::SOCK_DGRAM,  a[5]
+  assert_equal Socket::IPPROTO_UDP, a[6]
+end