C-Ares shouldn't iterate over all Object.prototype elements

and furthermore error out of one of them isn't a DNS option.

Test case by Ben Lund <ben.lund@gmail.com>; additional help from Tim Caswell
<tim@creationix.com>.

src/node_cares.cc

@@ -422,22 +422,13 @@ Handle<Value> Channel::New(const Arguments& args) {
     }
 
     Local<Object> options_o = Local<Object>::Cast(args[0]);
-    Local<Array> keys = options_o->GetPropertyNames();
-    int length = keys->Length();
 
-    for (int i = 0; i < length; ++i) {
-      Local<String> opt = Local<String>::Cast(keys->Get(Integer::New(i)));
-
-      if (opt->Equals(String::New("SOCK_STATE_CB"))) {
-        c->handle_->Set(callback_symbol, options_o->Get(opt));
+    Local<Value> cb = options_o->Get(String::NewSymbol("SOCK_STATE_CB"));
+    if (!cb.IsEmpty()) {
+      c->handle_->Set(callback_symbol, cb);
       options.sock_state_cb_data = c;
       options.sock_state_cb = Channel::SockStateCb;
       optmask |= ARES_OPT_SOCK_STATE_CB;
-        continue;
-      }
-
-      return ThrowException(Exception::Error(
-              String::New("Unknown Option")));
     }
   }
 

test/simple/test-regression-object-prototype.js

@@ -0,0 +1,8 @@
+var sys = require('sys');
+
+//sys.puts('puts before');
+
+Object.prototype.xadsadsdasasdxx = function () {
+};
+
+sys.puts('puts after');