[v9_9] refactor max-recursion-queries

- the counters weren't set correctly when fetches timed out.
  instead we now pass down a counter object.

(cherry picked from commit 05e448935c)
(cherry picked from commit 6c049c57d9)

bin/tests/system/reclimit/ans4/ans.pl

@@ -0,0 +1,83 @@
+#!/usr/bin/env perl
+
+use strict;
+use warnings;
+
+use IO::File;
+use Getopt::Long;
+use Net::DNS::Nameserver;
+
+my $pidf = new IO::File "ans.pid", "w" or die "cannot open pid file: $!";
+print $pidf "$$\n" or die "cannot write pid file: $!";
+$pidf->close or die "cannot close pid file: $!";
+sub rmpid { unlink "ans.pid"; exit 1; };
+
+$SIG{INT} = \&rmpid;
+$SIG{TERM} = \&rmpid;
+
+my $count = 0;
+my $send_response = 0;
+
+my $localaddr = "10.53.0.4";
+my $localport = 5300;
+my $verbose = 0;
+
+sub reply_handler {
+    my ($qname, $qclass, $qtype, $peerhost, $query, $conn) = @_;
+    my ($rcode, @ans, @auth, @add);
+
+    print ("request: $qname/$qtype\n");
+    STDOUT->flush();
+
+    $count += 1;
+
+    if ($qname eq "count" ) {
+        if ($qtype eq "TXT") {
+            my ($ttl, $rdata) = (0, "$count");
+            my $rr = new Net::DNS::RR("$qname $ttl $qclass $qtype $rdata");
+            push @ans, $rr;
+            print ("\tcount: $count\n");
+        }
+        $rcode = "NOERROR";
+    } elsif ($qname eq "reset" ) {
+        $count = 0;
+        $send_response = 0;
+        $rcode = "NOERROR";
+    } elsif ($qname eq "direct.example.net" ) {
+        if ($qtype eq "A") {
+            my ($ttl, $rdata) = (3600, $localaddr);
+            my $rr = new Net::DNS::RR("$qname $ttl $qclass $qtype $rdata");
+            push @ans, $rr;
+        }
+        $rcode = "NOERROR";
+    } elsif( $qname =~ /^ns1\.(\d+)\.example\.net$/ ) {
+        my $next = ($1 + 1) * 16;
+        for (my $i = 1; $i < 16; $i++) {
+            my $s = $next + $i;
+            my $rr = new Net::DNS::RR("$1.example.net 86400 $qclass NS ns1.$s.example.net");
+            push @auth, $rr;
+            $rr = new Net::DNS::RR("ns1.$s.example.net 86400 $qclass A 10.53.0.7");
+            push @add, $rr;
+        }
+        $rcode = "NOERROR";
+    } else {
+        $rcode = "NXDOMAIN";
+    }
+
+    # mark the answer as authoritive (by setting the 'aa' flag
+    return ($rcode, \@ans, \@auth, \@add, { aa => 1 });
+}
+
+GetOptions(
+    'port=i' => \$localport,
+    'verbose!' => \$verbose,
+);
+
+my $ns = Net::DNS::Nameserver->new(
+    LocalAddr => $localaddr,
+    LocalPort => $localport,
+    ReplyHandler => \&reply_handler,
+    Verbose => $verbose,
+);
+
+$ns->main_loop;