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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 = $@)
 	{