From f9c5b67b14d715ecabc1364564b2523748dcb16d Mon Sep 17 00:00:00 2001
From: Peter Palfrader <peter@palfrader.org>
Date: Mon, 26 Apr 2004 14:19:14 +0000
Subject: perl 5.6 does not do open3("-"), so we need to fork() and do lots of
 pipe() ourselves

---
 Echolot/Pinger/Mix.pm | 34 ++++++++++++++++++++++++++++------
 Echolot/Tools.pm      |  4 ++--
 2 files changed, 30 insertions(+), 8 deletions(-)

diff --git a/Echolot/Pinger/Mix.pm b/Echolot/Pinger/Mix.pm
index 2270ca1..4783f7e 100644
--- a/Echolot/Pinger/Mix.pm
+++ b/Echolot/Pinger/Mix.pm
@@ -18,7 +18,7 @@ This package provides functions for sending mixmaster (type II) pings.
 
 use strict;
 use English;
-use IPC::Open3;
+use IO::Handle;
 use Echolot::Log;
 
 sub ping($$$$$) {
@@ -67,28 +67,50 @@ sub ping($$$$$) {
 		Echolot::Log::warn("Cannot close $mixcfg: $!."),
 		return 0;
 	
-	my($wtr, $rdr, $err);
-	my $pid = open3($wtr, $rdr, $err, "|-");
+	my ($stdinR, $stdinW) = (IO::Handle->new(), IO::Handle->new());
+	my ($stdoutR, $stdoutW) = (IO::Handle->new(), IO::Handle->new());
+	my ($stderrR, $stderrW) = (IO::Handle->new(), IO::Handle->new());
+	pipe $stdinR, $stdinW;
+	pipe $stdoutR, $stdoutW;
+	pipe $stderrR, $stderrW;
+	my $pid = fork();
 	defined $pid or
 		Echolot::Log::warn("Cannot fork for calling mixmaster: $!."),
 		return 0;
 	unless ($pid) { # child
+		$stdinW->close;
+		$stdoutR->close;
+		$stderrR->close;
+		close STDIN;
+		close STDOUT;
+		close STDERR;
+		open (STDIN, "<&".$stdinR->fileno) or Echolot::Log::warn ("Cannot dup stdinR (fd ".$stdinR->fileno.") as STDIN: $!");
+		open (STDOUT, ">&".$stdoutW->fileno) or Echolot::Log::warn ("Cannot dup stdoutW (fd ".$stdoutW->fileno.") as STDOUT: $!");
+		open (STDERR, ">&".$stderrW->fileno) or Echolot::Log::warn ("Cannot dup stderrW (fd ".$stderrW->fileno.") as STDERE: $!");
 		$ENV{'MIXPATH'} = Echolot::Config::get()->{'mixhome'};
 		{ exec(Echolot::Config::get()->{'mixmaster'}, qw{-m -S -l}, $chaincomma); };
 		Echolot::Log::warn("Cannot exec mixpinger: $!.");
 		exit(1);
 	};
+	$stdinR->close;
+	$stdoutW->close;
+	$stderrW->close;
+
 	my $msg;
 	$msg .= "From: Echolot Pinger <$address>\n" if $with_from;
 	$msg .= "To: $to\n\n$body\n";
 
-	my ($stdout, $stderr, undef) = Echolot::Tools::readwrite_gpg($msg, $wtr, $rdr, $err, undef);
+	Echolot::Log::debug("mixping: fds: stdinW $stdinW; stdoutR $stdoutR; stderrR $stderrR."),
+	my ($stdout, $stderr, undef) = Echolot::Tools::readwrite_gpg($msg, $stdinW, $stdoutR, $stderrR, undef);
 	waitpid $pid, 0;
 
+	$stderr =~ s/\n+$//;
+	Echolot::Log::debug("Mixmaster said on unfiltered stderr: $stderr") if ($stderr ne '');
 	$stderr =~ s/^Chain: .*//mg;
 	$stderr =~ s/^Warning: The message has a From: line.*//mg;
-	Echolot::Log::info("Mixmaster said on stdout: $stdout");
-	Echolot::Log::warn("Mixmaster said on stderr: $stderr");
+	$stderr =~ s/\n+$//;
+	Echolot::Log::info("Mixmaster said on stdout: $stdout") if ($stdout ne '');
+	Echolot::Log::warn("Mixmaster said on stderr: $stderr") if ($stderr ne '');
 
 	return 1;
 };
diff --git a/Echolot/Tools.pm b/Echolot/Tools.pm
index 0264cfd..ed1a022 100644
--- a/Echolot/Tools.pm
+++ b/Echolot/Tools.pm
@@ -286,6 +286,8 @@ sub readwrite_gpg($$$$$) {
 	my $sin = IO::Select->new();
 	my $offset = 0;
 
+	Echolot::Log::debug("input is $inputfd; output is $stdoutfd; err is $stderrfd; status is ".(defined $statusfd ? $statusfd : 'undef').".");
+
 	$inputfd->blocking(0);
 	$stdoutfd->blocking(0);
 	$statusfd->blocking(0) if defined $statusfd;
@@ -295,8 +297,6 @@ sub readwrite_gpg($$$$$) {
 	$sout->add($statusfd) if defined $statusfd;
 	$sin->add($inputfd);
 
-	Echolot::Log::debug("input is $inputfd; output is $stdoutfd; err is $stderrfd; status is ".(defined $statusfd ? $statusfd : 'undef').".");
-
 	my ($stdout, $stderr, $status) = ("", "", "");
 
 	my ($readyr, $readyw, $written);
-- 
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