[PATCH v2] send-email: enable SSL level 1 debug output

From: John Keeping <john@keeping.me.uk>
Date: Dec 3, 2015, 21:47 UTC
Message-ID: <26c6006ad88146e0abfdfcaf99be686a4fb050c4.1449179138.git.john@keeping.me.uk>
In-Reply-To: <a56a8d728ffeb6a6c2b0f7decd0485a1906b8f25.1448409432.git.john@keeping.me.uk>

If a server's certificate isn't accepted by send-email, the output is:

	Unable to initialize SMTP properly. Check config and use --smtp-debug.

but adding --smtp-debug=1 just produces the same output since we don't get as far as talking SMTP.

Turning on SSL debug at level 1 gives:

	DEBUG: .../IO/Socket/SSL.pm:1796: SSL connect attempt failed error:14090086:SSL routines:ssl3_get_server_certificate:certificate verify failed
	DEBUG: .../IO/Socket/SSL.pm:673: fatal SSL error: SSL connect attempt failed error:14090086:SSL routines:ssl3_get_server_certificate:certificate verify failed
	DEBUG: .../IO/Socket/SSL.pm:1780: IO::Socket::IP configuration failed

IO::Socket::SSL defines level 1 debug as "print out errors from IO::Socket::SSL and ciphers from Net::SSLeay". In fact, it aliases Net::SSLeay::trace which is defined to guarantee silence at level 0 and only emit error messages at level 1, so let's enable it by default.

The modification of warnings is needed to avoid a warning about:

	Name "IO::Socket::SSL::DEBUG" used only once: possible typo

Signed-off-by: John Keeping <john@keeping.me.uk>
---
Sorry about the delay following up with this.

I don't particularly like the need for brackets and modifying the warnings here, but AFAIK there is no other way to avoid a warning that is likely to upset users (although I am far from a Perl expert).

 git-send-email.perl | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/git-send-email.perl b/git-send-email.perl
index e907e0e..72508be 100755
--- a/git-send-email.perl
+++ b/git-send-email.perl
@@ -1318,6 +1318,13 @@ Message-Id: $message_id
 			require Net::SMTP::SSL;
 			$smtp_domain ||= maildomain();
 			require IO::Socket::SSL;
+
+			# Suppress "variable accessed once" warning.
+			{
+				no warnings 'once';
+				$IO::Socket::SSL::DEBUG = 1;
+			}
+
 			# Net::SMTP::SSL->new() does not forward any SSL options
 			IO::Socket::SSL::set_client_defaults(
 				ssl_verify_params());

-- 
2.6.3.462.gbe2c914