difference between opendkim-testmsg and opendkim for verification

From: Vinubalaji Gopal <vgopal_at_abaca.com>
Date: Tue, 29 Jan 2013 00:21:07 +0000

Hi,
  I am trying to run a message through opendkim-testmsg and opendkim with the -t option for message verification. I see that the message verification succeeds with the opendkim binary but fails when I use opendkim-testmsg.

#bash# opendkim-testmsg < /tmp/dkim-test/test-msg.eml
opendkim-testmsg: dkim_eom(): Bad signature

#bash# opendkim -t /tmp/dkim-test/test-msg.eml
opendkim: /tmp/dkim-test/test-msg.eml: verification (s=20110426, d=mx.aol.com, 1024-bit key) succeeded

I can send the whole message if that helps. I am pasting the dkim related headers here:

DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com;
        s=20110426; t=1333805525;
        bh=sUtXOD9kIbE9nFaZcq4nK6eMpPFsGcRZMAIvEF18eO0=;
        h=From:Subject:Date:MIME-Version:Content-Type;
        b=YVcndekXGr77RDqorbjg8qeGZALqZAWRkp8en5fZMAuY6Uhqg/wybgffrjqa3KnnB
         aQm/T52Rzt7YSENG3ykhsmW7xQOaT509JKXEYI/eopty7h9mrDugTYqaUf6uL+VQg+
         PC1dIYXzLdzfT8yd9TgelSdLG8T+8+3yIHVVU9Us=DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com;
        s=20110426; t=1333805525;
        bh=sUtXOD9kIbE9nFaZcq4nK6eMpPFsGcRZMAIvEF18eO0=;
        h=From:Subject:Date:MIME-Version:Content-Type;
        b=YVcndekXGr77RDqorbjg8qeGZALqZAWRkp8en5fZMAuY6Uhqg/wybgffrjqa3KnnB
         aQm/T52Rzt7YSENG3ykhsmW7xQOaT509JKXEYI/eopty7h9mrDugTYqaUf6uL+VQg+
         PC1dIYXzLdzfT8yd9TgelSdLG8T+8+3yIHVVU9Us=^M

I found out the difference in the result was due to the extra ^M which is due to the difference in the file format. Doing a dos2unix on the file fixes opendkim-testmsg to work properly. My question is what does opendkim.c do that makes it handle cases like these carriage returns? Is there any option in ilbopendkim/opendkim-testmsg to do the same?
Received on Tue Jan 29 2013 - 00:21:20 PST