sanitize http headers in NativeMailerHandler to prevent injections. added tests.

tests/Monolog/Handler/NativeMailerHandlerTest.php

@@ -0,0 +1,44 @@
+<?php
+
+/*
+ * This file is part of the Monolog package.
+ *
+ * (c) Jordi Boggiano <j.boggiano@seld.be>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Monolog\Handler;
+
+use Monolog\Logger;
+use Monolog\TestCase;
+
+class NativeMailerHandlerTest extends TestCase
+{
+    /**
+     * @expectedException InvalidArgumentException
+     */
+    public function testConstructorHeaderInjection()
+    {
+        $mailer = new NativeMailerHandler('spammer@example.org', 'dear victim', "receiver@example.org\r\nFrom: faked@attacker.org");
+    }
+    
+    /**
+     * @expectedException InvalidArgumentException
+     */
+    public function testSetterHeaderInjection()
+    {
+        $mailer = new NativeMailerHandler('spammer@example.org', 'dear victim', 'receiver@example.org');
+        $mailer->addHeader("Content-Type: text/html\r\nFrom: faked@attacker.org");
+    }
+    
+    /**
+     * @expectedException InvalidArgumentException
+     */
+    public function testSetterArrayHeaderInjection()
+    {
+        $mailer = new NativeMailerHandler('spammer@example.org', 'dear victim', 'receiver@example.org');
+        $mailer->addHeader(array("Content-Type: text/html\r\nFrom: faked@attacker.org"));
+    }
+}