gnu: dkimproxy: Add IPv6 support.

* gnu/packages/mail.scm (dkimproxy)[source]: Add patch.
* gnu/packages/patches/dkimproxy-add-ipv6-support.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.

gnu/local.mk

@@ -756,6 +756,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/dfu-programmer-fix-libusb.patch		\
   %D%/packages/patches/diffutils-gets-undeclared.patch		\
   %D%/packages/patches/diffutils-getopt.patch			\
+  %D%/packages/patches/dkimproxy-add-ipv6-support.patch		\
   %D%/packages/patches/docbook-xsl-nonrecursive-string-subst.patch	\
   %D%/packages/patches/doc++-include-directives.patch		\
   %D%/packages/patches/doc++-segfault-fix.patch			\

gnu/packages/mail.scm

@@ -1967,7 +1967,9 @@ DKIM and/or DomainKeys.")
                      version "/dkimproxy-" version ".tar.gz"))
               (sha256
                (base32
-                "1gc5c7lg2qrlck7b0lvjfqr824ch6jkrzkpsn0gjvlzg7hfmld75"))))
+                "1gc5c7lg2qrlck7b0lvjfqr824ch6jkrzkpsn0gjvlzg7hfmld75"))
+              (patches
+               (search-patches "dkimproxy-add-ipv6-support.patch"))))
     (build-system gnu-build-system)
     (arguments
      `(#:phases
@@ -1997,11 +1999,13 @@ DKIM and/or DomainKeys.")
     (inputs
      `(("perl" ,perl)
        ("perl-crypt-openssl-rsa" ,perl-crypt-openssl-rsa)
+       ("perl-io-socket-inet6" ,perl-io-socket-inet6)
        ("perl-mailtools" ,perl-mailtools)
        ("perl-mail-authenticationresults" ,perl-mail-authenticationresults)
        ("perl-mail-dkim" ,perl-mail-dkim)
        ("perl-net-dns" ,perl-net-dns)
-       ("perl-net-server" ,perl-net-server)))
+       ("perl-net-server" ,perl-net-server)
+       ("perl-socket6" ,perl-socket6)))
     (home-page "http://dkimproxy.sourceforge.net/")
     (synopsis "SMTP-proxy for DKIM signing and verifying")
     (description "DKIMproxy is an SMTP-proxy that signs and/or verifies emails,

gnu/packages/patches/dkimproxy-add-ipv6-support.patch

@@ -0,0 +1,75 @@
+From: Tobias Geerinckx-Rice <me@tobias.gr>
+Date: Fri, 01 Mar 2019 20:51:32 +0100
+Subject: [PATCH] dkimproxy: Add IPv6 support.
+
+The following patch was copied verbatim from Debian[0].
+
+[0]: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=656041
+
+---
+--- dkimproxy-1.4.1.orig/lib/MSDW/SMTP/Server.pm
++++ dkimproxy-1.4.1/lib/MSDW/SMTP/Server.pm
+@@ -11,7 +11,7 @@
+ # Written by Bennett Todd <bet@rahul.net>
+ 
+ package MSDW::SMTP::Server;
+-use IO::Socket;
++use IO::Socket::INET6;
+ use IO::File;
+ 
+ =head1 NAME
+@@ -88,14 +88,14 @@
+ =item new(interface => $interface, port => $port);
+ 
+ The interface and port to listen on must be specified. The interface
+-must be a valid numeric IP address (0.0.0.0 to listen on all
+-interfaces, as usual); the port must be numeric. If this call
+-succeeds, it returns a server structure with an open
+-IO::Socket::INET in it, ready to listen on. If it fails it dies, so
+-if you want anything other than an exit with an explanatory error
+-message, wrap the constructor call in an eval block and pull the
+-error out of $@ as usual. This is also the case for all other
+-methods; they succeed or they die.
++must be a valid numeric IPv4 or IPv6 address (0.0.0.0 or :: to listen
++on all interfaces, as usual); the port must be numeric. If this call
++succeeds, it returns a server structure with an open IO::Socket::INET6
++in it, ready to listen on. If it fails it dies, so if you want
++anything other than an exit with an explanatory error message, wrap
++the constructor call in an eval block and pull the error out of $@ as
++usual. This is also the case for all other methods; they succeed or
++they die.
+ 
+ =item accept([debug => FD]);
+ 
+@@ -154,7 +154,7 @@
+     my ($this, @opts) = @_;
+     my $class = ref($this) || $this;
+     my $self = bless { @opts }, $class;
+-    $self->{sock} = IO::Socket::INET->new(
++    $self->{sock} = IO::Socket::INET6->new(
+ 	LocalAddr => $self->{interface},
+ 	LocalPort => $self->{port},
+ 	Proto => 'tcp',
+only in patch2:
+unchanged:
+--- dkimproxy-1.4.1.orig/scripts/dkimproxy.out
++++ dkimproxy-1.4.1/scripts/dkimproxy.out
+@@ -314,17 +314,11 @@
+ {
+ 	my $self = shift;
+ 
+-	# try to determine peer's address
+-	use Socket;
+-	my $peersockaddr = getpeername(STDOUT);
+-	my ($port, $iaddr) = sockaddr_in($peersockaddr);
+-	$ENV{REMOTE_ADDR} = inet_ntoa($iaddr);
+-
+ 	# initialize syslog
+ 	eval
+ 	{
+ 		openlog("dkimproxy.out", "perror,pid,ndelay", "mail");
+-		syslog("debug", '%s', "connect from $ENV{REMOTE_ADDR}");
++		syslog("debug", '%s', "connect from $self->{server}->{peeraddr}");
+ 	};
+ 	if (my $E = $@)
+ 	{