git-send-email.perl - try to give real name of the calling host to HELO/EHLO

Add new functions maildomain_net(), maildomain_mta() and
maildomain(), which return FQDN where possible for use in
send_message(). The value is passed to Net::SMTP HELO/EHLO
handshake. The domain name can also be set via new --smtp-domain
option.

The default value in Net::SMTP may not get through:

  Net::SMTP=GLOB(0x267ec28)>>> EHLO localhost.localdomain
  Net::SMTP=GLOB(0x267ec28)<<< 550 EHLO argument does not match calling host

whereas using the FQDN that matches the IP, the result is:

  Net::SMTP=GLOB(0x15b8e80)>>> EHLO host.example.com
  Net::SMTP=GLOB(0x15b8e80)<<< 250-host.example.com Hello host.example.com [192.168.1.7]

The maildomain*() code is based on ideas in Perl library
Test::Reporter by Graham Barr <gbarr@pobox.com> and Mark Overmeer
<mailtools@overmeer.net> released under the same terms as Perl
itself.

Signed-off-by: Jari Aalto <jari.aalto@cante.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/git-send-email.perl b/git-send-email.perl
index a8887ea6da0373ab41c45a7472ac6cb18c1f2011..dba587601ddbdcf10a17c5de1d3b5523092099c7 100755 (executable)
--- a/git-send-email.perl
+++ b/git-send-email.perl
@@ -64,6 +64,7 @@ git send-email [options] <file | directory | rev-list options >
     --smtp-pass             <str>  * Password for SMTP-AUTH; not necessary.
     --smtp-encryption       <str>  * tls or ssl; anything else disables.
     --smtp-ssl                     * Deprecated. Use '--smtp-encryption ssl'.
+    --smtp-domain           <str>  * The domain name sent to HELO/EHLO handshake
     --smtp-debug            <0|1>  * Disable, enable Net::SMTP debug.
 
   Automating:
@@ -131,6 +132,8 @@ my $have_email_valid = eval { require Email::Valid; 1 };
 my $have_mail_address = eval { require Mail::Address; 1 };
 my $smtp;
 my $auth;
+my $mail_domain_default = "localhost.localdomain";
+my $mail_domain;
 
 sub unique_email_list(@);
 sub cleanup_compose_files();
@@ -274,6 +277,7 @@ my $rc = GetOptions("sender|from=s" => \$sender,
                    "smtp-ssl" => sub { $smtp_encryption = 'ssl' },
                    "smtp-encryption=s" => \$smtp_encryption,
                    "smtp-debug:i" => \$debug_net_smtp,
+                   "smtp-domain:s" => \$mail_domain,
                    "identity=s" => \$identity,
                    "annotate" => \$annotate,
                    "compose" => \$compose,
@@ -834,6 +838,62 @@ sub sanitize_address
 
 }
 
+# Returns the local Fully Qualified Domain Name (FQDN) if available.
+#
+# Tightly configured MTAa require that a caller sends a real DNS
+# domain name that corresponds the IP address in the HELO/EHLO
+# handshake. This is used to verify the connection and prevent
+# spammers from trying to hide their identity. If the DNS and IP don't
+# match, the receiveing MTA may deny the connection.
+#
+# Here is a deny example of Net::SMTP with the default "localhost.localdomain"
+#
+# Net::SMTP=GLOB(0x267ec28)>>> EHLO localhost.localdomain
+# Net::SMTP=GLOB(0x267ec28)<<< 550 EHLO argument does not match calling host
+#
+# This maildomain*() code is based on ideas in Perl library Test::Reporter
+# /usr/share/perl5/Test/Reporter/Mail/Util.pm ==> sub _maildomain ()
+
+sub maildomain_net
+{
+       my $maildomain;
+
+       if (eval { require Net::Domain; 1 }) {
+               my $domain = Net::Domain::domainname();
+               $maildomain = $domain
+                       unless $^O eq 'darwin' && $domain =~ /\.local$/;
+       }
+
+       return $maildomain;
+}
+
+sub maildomain_mta
+{
+       my $maildomain;
+
+       if (eval { require Net::SMTP; 1 }) {
+               for my $host (qw(mailhost localhost)) {
+                       my $smtp = Net::SMTP->new($host);
+                       if (defined $smtp) {
+                               my $domain = $smtp->domain;
+                               $smtp->quit;
+
+                               $maildomain = $domain
+                                       unless $^O eq 'darwin' && $domain =~ /\.local$/;
+
+                               last if $maildomain;
+                       }
+               }
+       }
+
+       return $maildomain;
+}
+
+sub maildomain
+{
+       return maildomain_net() || maildomain_mta() || $mail_domain_default;
+}
+
 # Returns 1 if the message was sent, and 0 otherwise.
 # In actuality, the whole program dies when there
 # is an error sending a message.
@@ -936,13 +996,18 @@ X-Mailer: git-send-email $gitversion
                if ($smtp_encryption eq 'ssl') {
                        $smtp_server_port ||= 465; # ssmtp
                        require Net::SMTP::SSL;
-                       $smtp ||= Net::SMTP::SSL->new($smtp_server, Port => $smtp_server_port);
+                       $mail_domain ||= maildomain();
+                       $smtp ||= Net::SMTP::SSL->new($smtp_server,
+                                                     Hello => $mail_domain,
+                                                     Port => $smtp_server_port);
                }
                else {
                        require Net::SMTP;
+                       $mail_domain ||= maildomain();
                        $smtp ||= Net::SMTP->new((defined $smtp_server_port)
                                                 ? "$smtp_server:$smtp_server_port"
                                                 : $smtp_server,
+                                                Hello => $mail_domain,
                                                 Debug => $debug_net_smtp);
                        if ($smtp_encryption eq 'tls' && $smtp) {
                                require Net::SMTP::SSL;
@@ -965,6 +1030,7 @@ X-Mailer: git-send-email $gitversion
                        die "Unable to initialize SMTP properly. Check config and use --smtp-debug. ",
                            "VALUES: server=$smtp_server ",
                            "encryption=$smtp_encryption ",
+                           "maildomain=$mail_domain",
                            defined $smtp_server_port ? "port=$smtp_server_port" : "";
                }