+sub qualify ($) {
+ my ($i) = @_;
+ $i= "$default_dir/$i" unless $i =~ m,^/,;
+ return $i;
+}
+
+sub zone_conf ($$@) {
+ my ($zone,$style,$file,@servers) = @_;
+ $file= qualify("$slave_dir/$slave_prefix".$zone.$slave_suffix)
+ unless length $file;
+ if (!length $output) {
+ $default_output= qualify('chiark-conf-gen.bind8')
+ unless length $default_output;
+ set_output($default_output);
+ }
+ cfg_fail("redefined zone $zone") if exists $zone_cfg{$zone};
+ $zone_cfg{$zone}{'file'}= $file;
+ $zone_cfg{$zone}{'style'}= $style;
+ $zone_cfg{$zone}{'servers'}= [ @servers ];
+ $zone_cfg{$zone}{'self_soa'}= [ @self_soa ];
+ $zone_cfg{$zone}{'self_ns'}= [ @self_ns ];
+ $zone_cfg{$zone}{'output'}= $output;
+ push @zone_cfg_list, $zone;
+}
+
+sub set_output($) {
+ my ($newout) = @_;
+ $output= $newout;
+ $output_contents{$output}= '';
+}
+
+
+#-------------------- checking
+
+use vars qw($zone $cfg $warnings);
+$warnings= 0;
+
+sub progress ($) {
+ return if !$verbosity;
+ print "$_[0]\n";
+}
+
+sub verbose ($) {
+ return if $verbosity<2;
+ print " $_[0]\n";
+}
+
+sub process_zones (@) {
+ my (@zones) = @_;
+ local ($zone,$cfg);
+
+ foreach $zone (@zones) {
+ $cfg= $zone_cfg{$zone} || {
+ 'style' => 'foreign',
+ 'servers' => [ ],
+ };
+ progress(sprintf "%-40s %s", $zone, $$cfg{'style'});
+ if ($check) {
+ eval {
+ if ($localonly && $cfg->{'style'} eq 'foreign') {
+ zone_warning("foreign zone specified with -l");
+ } elsif ($localonly && $cfg->{'style'} ne 'primary') {
+ zone_check_local();
+ } else {
+ zone_check_full();
+ }
+ };
+ zone_warning("checks failed: $@") if length $@;
+ }
+ zone_output() if $install;
+ }
+ print STDERR "$quis: $warnings warnings\n" or die $!
+ if $warnings;
+}
+
+sub zone_warning ($) {
+ my ($w) = @_;
+ $w =~ s/\n$//;
+ $w =~ s,\n, // ,g;
+ print STDERR "$zone: warning: $w\n" or die $!;
+ $warnings++;
+}
+
+sub zone_warnmore ($) {
+ print STDERR " $_[0]\n" or die $!;
+}
+
+use vars qw(%delgs); # $delgs{$nameserver_list} = [ $whosaidandwhy ]
+use vars qw(%auths); # $auths{$nameserver_list} = [ $whosaidandwhy ]
+use vars qw(%glue); # $glue{$name}{$addr_list} = [ $whosaidandwhy ]
+use vars qw(%soas); # $soa{"$origin $serial"} = [ $whosaidandwhy ]
+use vars qw(%addr_is_ok %gluelesswarned);
+use vars qw(@to_check); # ($addr,$whyask,$is_auth,$glueless_ok, ...)
+use vars qw(@to_check_soa); # ($addr,$whyask, ...)
+
+sub zone_check_full () {
+ zone_reset();
+ zone_investigate();
+ zone_consistency();
+ zone_servers_ok();
+}
+
+sub zone_reset() {
+ %delgs= %auths= %glue= %soas= %gluelesswarned= %addr_is_ok= ();
+ @to_check= @to_check_soa= ();
+}
+
+sub zone_investigate() {
+ my ($super_zone, @super_nsnames,
+ $super_ns, @super_ns_addrs, $s, $wa, $is_auth,
+ %nsrrset_checked, %soa_checked, $addr, $glueless_ok, $rcode);
+
+ $super_zone= $zone;
+ for (;;) {
+ debug_trace("zone $zone superzone $super_zone");
+ $super_zone =~ s/^[^.]+\.// or die "no superzone ? ($super_zone)\n";
+ ($rcode,@super_nsnames)= lookup($super_zone,'ns-','06');
+ last if !$rcode;
+ }
+ for $super_ns (@super_nsnames) {
+ $super_ns= lc $super_ns;
+ ($rcode,@super_ns_addrs)= lookup($super_ns,'a','0');
+ foreach $addr (@super_ns_addrs) {
+ push @to_check,
+ $addr,
+ "$super_ns, server for $super_zone",
+ 0, 0;
+ }
+ }
+ for (;;) {
+ # We do these in order so that we always do NS RRset checks on
+ # nameservers that came from other NS RRsets first; otherwise
+ # we might set nsrrset_checked due to a glueless_ok check,
+ # and then not check for gluefulness later.
+ debug_dump('@to_check @to_check_soa');
+ if (($addr,$wa,$is_auth,$glueless_ok,@to_check) = @to_check) {
+ push @to_check_soa, $addr, $wa if $is_auth;
+ next if $nsrrset_checked{$addr}++;
+ zone_check_nsrrset($addr, "[$addr] $wa",
+ $is_auth, $glueless_ok);
+ } elsif (($addr,$wa,@to_check_soa) = @to_check_soa) {
+ next if $soa_checked{$addr}++;
+ zone_check_soa($addr,"[$addr] $wa");
+ } else {
+ last;
+ }
+ }
+}
+
+sub zone_check_nsrrset ($$$$) {
+ my ($uaddr,$ww, $is_auth, $glueless_ok) = @_;
+ my (@s, $s, %s2g, @glue, $glue, $delgs_or_auths);
+ verbose("checking delegation by $ww");
+ dig(sub {
+ if ($dig_type eq 'ns' && $dig_owner eq $zone) {
+ $s2g{lc $dig_rdata} = [ ];
+ } elsif ($dig_type eq 'a' && exists $s2g{$dig_owner}) {
+ push @to_check,
+ $dig_rdata,
+ "$dig_owner, in glue from $ww",
+ 1, 0;
+ $addr_is_ok{$dig_rdata}= "$dig_owner (NS [$uaddr])"
+ if $cfg->{'style'} eq 'stealth';
+ push @{ $s2g{$dig_owner} }, $dig_rdata;
+ }
+ },
+ $zone,'ns',$uaddr);
+ if (!%s2g) { zone_warning("unable to find NS RRset at $ww"); return; }
+ elsif (keys %s2g == 1) { zone_warning("only one nameserver at $ww"); }
+ @s= sort keys %s2g;
+ foreach $s (@s) {
+ @glue= @{ $s2g{$s} };
+ if (!@glue) {
+ zone_warning("glueless NS $s,".
+ ($needglue<=1 ? " (eg)" : "").
+ " from $ww")
+ unless $glueless_ok || !$needglue ||
+ ($needglue<=1 && $gluelesswarned{$s}++);
+ next;
+ }
+ $glue= join ' ', sort @glue;
+ push @{ $glue{$s}{$glue} }, $ww;
+ }
+ $s= join ' ', @s;
+ $delgs_or_auths= $is_auth ? \%auths : \%delgs;
+ push @{ $delgs_or_auths->{$s} }, $ww;
+}
+
+sub zone_check_soa ($$) {
+ my ($uaddr,$ww) = @_;
+ my ($lame,$origin,$got,$rcode,@soa_addrs,$soa_addr);
+ verbose("checking service at $ww");
+ $lame= 'dead or lame';
+ dig(sub {
+ if ($dig_type eq 'flags:') {
+ $lame= $dig_rdata =~ m/ aa / ? '' : 'lame';
+ } elsif ($dig_type eq 'soa' && $dig_owner eq $zone && !$lame) {
+ die "several SOAs ? $ww" if defined $origin;
+ $got= $dig_rdata;
+ $got =~ m/^(\S+) \d+/ or die "$got ?";
+ $origin= $1;
+ }
+ },
+ $zone,'soa',$uaddr);
+ $lame= 'broken' if !$lame && !defined $origin;
+ if ($lame) { zone_warning("$lame server $ww"); return; }
+ push @{ $soas{$got} }, $ww;
+ ($rcode,@soa_addrs)= lookup($origin,'a','0');
+ foreach $soa_addr (@soa_addrs) {
+ $addr_is_ok{$soa_addr}= "$origin (SOA [$uaddr])";
+ push @to_check,
+ $soa_addr,
+ "$origin, SOA ORIGIN from $ww";
+ }
+}
+
+sub zone_consistency() {
+ my ($d, $org_ser, $origin, $a, $h);
+ zone_consistency_set('delegations',\%delgs);
+ foreach $d (keys %delgs) { delete $auths{$d}; }
+ zone_consistency_set('zone nameserver rrset',\%auths);
+ foreach $h (keys %glue) {
+ zone_consistency_set("glue for $h", $glue{$h});
+ }
+ zone_consistency_set("SOA ORIGIN and SERIAL",\%soas);
+ if ($cfg->{'style'} eq 'primary') {
+ foreach $org_ser (keys %soas) {
+ $org_ser =~ m/^(\S+) \d+$/ or die "$org_ser ?";
+ $origin= $1;
+ next if grep { $_ eq $origin } @self_soa;
+ zone_warning("our name(s) @self_soa not in SOA ORIGIN $origin,".
+ " eg from ".((values %{ $soas{$org_ser} })[1]));
+ }
+ }
+}
+
+sub zone_servers_ok () {
+ my ($showok);
+ if (%addr_is_ok) {
+ $showok= 0;
+ foreach $a (@{ $cfg->{'servers'} }) {
+ next if exists $addr_is_ok{$a};
+ zone_warning("we slave from $a"); $showok=1;
+ }
+ if ($showok) {
+ foreach $a (keys %addr_is_ok) {
+ zone_warnmore("permitted master [$a] $addr_is_ok{$a}");
+ }
+ }
+ }
+}
+
+sub zone_consistency_set ($%) {
+ my ($msg,$set) = @_;
+ my ($d,$o);
+ if (keys(%$set) > 1) {
+ zone_warning("inconsistent $msg:");
+ foreach $d (keys %$set) {
+ foreach $o (@{ $set->{$d} }) { zone_warnmore(" $d from $o"); }
+ }
+ }
+}
+
+sub zone_check_local () {
+ zone_reset();
+ zone_servers_simplefind();
+ zone_servers_ok();
+}
+
+sub zone_servers_simplefind () {
+ my ($rcode,@nsnames,$ns,@soas,$origin);
+ if ($cfg->{'style'} eq 'stealth') {
+ ($rcode,@nsnames)= lookup($zone,'ns-','0');
+ foreach $ns (@nsnames) { zone_server_simple($ns,'NS'); }
+ }
+ ($rcode,@soas)= lookup($zone,'soa','0');
+ die "multiple SOA RRs in set! @soas ?" if @soas!=1;
+ $soas[0] =~ m/^(\S+)\s/ or die "SOA ? $_";
+ zone_server_simple(domain_canon($1),'SOA');
+}
+
+sub zone_server_simple ($$) {
+ my ($name,$why) = @_;
+ my ($rcode,@addrs,$addr);
+ ($rcode,@addrs)= lookup($name,'a','0');
+ foreach $addr (@addrs) { $addr_is_ok{$addr}= "$name ($why)"; }
+}
+
+#-------------------- outputting
+
+sub zone_output () {
+ $output_contents{$$cfg{'output'}}.=
+ sprintf(<<'END',
+zone "%s" {
+ type %s;
+ file "%s";
+};
+END
+ $zone,
+ $$cfg{'style'} eq 'primary' ? 'master' : 'slave',
+ $$cfg{'file'});
+}
+
+
+#-------------------- general utilities
+
+sub debug_dump ($) {
+ my ($vn);
+ return unless $debug>1;
+ local $Data::Dumper::Terse=1;
+ foreach $vn (split /\s+/, $_[0]) {
+ print "$vn := ", eval "Dumper(\\$vn)";
+ }
+}
+
+sub debug_trace ($) {
+ return unless $debug;
+ print "D $_[0]\n";
+}
+
+sub lookup ($$$) {
+ my ($domain,$type,$okrcodes) = @_;
+ my ($c,$h,@result);
+ debug_trace("lookup ==> (->$okrcodes) $domain $type");
+ $h= new IO::Handle;
+
+ defined($c= open $h, "-|") or die "$quis: fork adnshost:\n $!\n";