#!/usr/bin/perl -w -T
# XMLRPC interface to manipulate most DNS DB entities
##
# $Id$
# Copyright 2012-2016 Kris Deugau <kdeugau@deepnet.cx>
# 
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation, either version 3 of the License, or
#    (at your option) any later version. 
# 
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
# 
#    You should have received a copy of the GNU General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
##

use strict;
use warnings;

# don't remove!  required for GNU/FHS-ish install from tarball
use lib '.';	##uselib##
use DNSDB;

use FCGI;
#use Frontier::RPC2;
use Frontier::Responder;

## We need to handle a couple of things globally, rather than pasting the same bit into *every* sub.
## So, let's subclass Frontier::RPC2 + Frontier::Responder, so we can override the single sub in each
## that needs kicking
#### hmm.  put this in a separate file?
#package DNSDB::RPC;
#our @ISA = ("Frontier::RPC2", "Frontier::Responder");
#package main;

my $dnsdb = DNSDB->new();

my $methods = {
#sub getPermissions {
#sub changePermissions {
#sub comparePermissions {
#sub changeGroup {
	'dnsdb.addDomain'	=> \&addDomain,
	'dnsdb.delZone'		=> \&delZone,
#sub domainName {
#sub revName {
	'dnsdb.domainID'	=> \&domainID,
#sub revID {
	'dnsdb.addRDNS'		=> \&addRDNS,
#sub getZoneCount {
#sub getZoneList {
#sub getZoneLocation {
	'dnsdb.addGroup'	=> \&addGroup,
	'dnsdb.delGroup'	=> \&delGroup,
#sub getChildren {
#sub groupName {
#sub getGroupCount {
#sub getGroupList {
#sub groupID {
	'dnsdb.addUser'		=> \&addUser,
#sub getUserCount {
#sub getUserList {
#sub getUserDropdown {
	'dnsdb.updateUser'	=> \&updateUser,
	'dnsdb.delUser'		=> \&delUser,
#sub userFullName {
#sub userStatus {
#sub getUserData {
#sub addLoc {
#sub updateLoc {
#sub delLoc {
#sub getLoc {
#sub getLocCount {
#sub getLocList {
	'dnsdb.getLocDropdown'	=> \&getLocDropdown,
	'dnsdb.getSOA'		=> \&getSOA,
#sub updateSOA {
	'dnsdb.getRecLine'	=> \&getRecLine,
	'dnsdb.getRecList'	=> \&getRecList,
	'dnsdb.getRecCount'	=> \&getRecCount,
	'dnsdb.addRec'		=> \&rpc_addRec,
	'dnsdb.updateRec'	=> \&rpc_updateRec,
#sub downconvert {
	'dnsdb.addOrUpdateRevRec'	=> \&addOrUpdateRevRec,
	'dnsdb.updateRevSet'	=> \&updateRevSet,
	'dnsdb.splitTemplate'	=> \&splitTemplate,
	'dnsdb.resizeTemplate'	=> \&resizeTemplate,
	'dnsdb.templatesToRecords'	=> \&templatesToRecords,
	'dnsdb.delRec'		=> \&delRec,
	'dnsdb.delByCIDR'	=> \&delByCIDR,
	'dnsdb.delRevSet'	=> \&delRevSet,
#sub getLogCount {}
#sub getLogEntries {}
	'dnsdb.getRevPattern'	=> \&getRevPattern,
	'dnsdb.getRevSet'	=> \&getRevSet,
	'dnsdb.getTypelist'	=> \&getTypelist,
	'dnsdb.getTypemap'	=> \&getTypemap,
	'dnsdb.getReverse_typemap'	=> \&getReverse_typemap,
#sub parentID {
#sub isParent {
	'dnsdb.zoneStatus'	=> \&zoneStatus,
	'dnsdb.getZonesByCIDR'	=> \&getZonesByCIDR,
#sub importAXFR {
#sub importBIND {
#sub import_tinydns {
#sub export {
#sub mailNotify {

	'dnsdb.getMethods'	=> \&get_method_list
};

my $reqcnt = 0;
my $req = FCGI::Request();

while ($req->Accept() >= 0) {
  my $res = Frontier::Responder->new(
	methods => $methods
	);

  # "Can't do that" errors
  if (!$dnsdb) {
    print "Content-type: text/xml\n\n".$res->{_decode}->encode_fault(5, $dnsdb->err);
  } else {
    print $res->answer;
  }
  last if $reqcnt++ > $dnsdb->{maxfcgi};
} # while FCGI::accept


exit;

##
## Subs below here
##

##
## Internal utility subs
##

# Check RPC ACL
sub _aclcheck {
  my $subsys = shift;
  return 1 if grep /$ENV{REMOTE_ADDR}/, @{$dnsdb->{rpcacl}{$subsys}};
  warn "$subsys/$ENV{REMOTE_ADDR} not in ACL\n";	# a bit of logging
  return 0;
}

# Let's see if we can factor these out of the RPC method subs
sub _commoncheck {
  my $argref = shift;
  my $needslog = shift;

  die "Missing remote system name\n" if !$argref->{rpcsystem};
  die "Access denied\n" if !_aclcheck($argref->{rpcsystem});
  if ($needslog) {
    die "Missing remote username\n" if !$argref->{rpcuser};
    die "Couldn't set userdata for logging\n"
	unless $dnsdb->initRPC(username => $argref->{rpcuser}, rpcsys => $argref->{rpcsystem},
		fullname => ($argref->{fullname} ? $argref->{fullname} : $argref->{rpcuser}) );
  }
}

# check for defrec and revrec;  only call on subs that deal with records
sub _reccheck {
  my $argref = shift;
  die "Missing defrec and/or revrec flags\n" if !($argref->{defrec} || $argref->{revrec});
}

# set location to the zone's default location if none is specified
sub _loccheck {
  my $argref = shift;
  if (!$argref->{location} && $argref->{defrec} eq 'n') {
    $argref->{location} = $dnsdb->getZoneLocation($argref->{revrec}, $argref->{parent_id});
  }
}

# set ttl to zone default minttl if none is specified
sub _ttlcheck {
  my $argref = shift;
  if (!$argref->{ttl}) {
    my $tmp = $dnsdb->getSOA($argref->{defrec}, $argref->{revrec}, $argref->{parent_id});
    $argref->{ttl} = $tmp->{minttl};
  }
}

# Check if the hashrefs passed in refer to identical record data, so we can skip
# the actual update if nothing has actually changed.  This is mainly useful for
# reducing log noise due to chained calls orginating with updateRevSet() since
# "many" records could be sent for update but only one or two have actually changed.
sub _checkRecMod {
  my $oldrec = shift;
  my $newrec = shift;

  # Because we don't know which fields we've even been passed
  no warnings qw(uninitialized);

  my $modflag = 0;
  # order by most common change.  host should be first, due to rDNS RPC calls
  for my $field (qw(host type val)) {
    return 1 if (
        defined($newrec->{$field}) &&
        $oldrec->{$field} ne $newrec->{$field} );
  }

  return 0;
} # _checRecMod


##
## Shims for DNSDB core subs
##

#sub connectDB {
#sub finish {
#sub initGlobals {
#sub initPermissions {
#sub getPermissions {
#sub changePermissions {
#sub comparePermissions {
#sub changeGroup {
#sub _log {

sub addDomain {
  my %args = @_;

  _commoncheck(\%args, 'y');

  my ($code, $msg) = $dnsdb->addDomain($args{domain}, $args{group}, $args{state}, $args{defloc});
  die "$msg\n" if $code eq 'FAIL';
  return $msg;	# domain ID
}

sub delZone {
  my %args = @_;

  _commoncheck(\%args, 'y');
  die "Need forward/reverse zone flag\n" if !$args{revrec};
  die "Need zone identifier\n" if !$args{zone};

  my ($code,$msg);
  # Let's be nice;  delete based on zone id OR zone name.  Saves an RPC call round-trip, maybe.
  if ($args{zone} =~ /^\d+$/) {
    ($code,$msg) = $dnsdb->delZone($args{zone}, $args{revrec});
  } else {
    die "Need zone location\n" if !defined($args{location});
    my $zoneid;
    $zoneid = $dnsdb->domainID($args{zone}, $args{location}) if $args{revrec} eq 'n';
    $zoneid = $dnsdb->revID($args{zone}, $args{location}) if $args{revrec} eq 'y';
    die "Can't find zone: ".$dnsdb->errstr."\n" if !$zoneid;
    ($code,$msg) = $dnsdb->delZone($zoneid, $args{revrec});
  }
  die "$msg\n" if $code eq 'FAIL';
  return $msg;
} # delZone()

#sub domainName {}
#sub revName {}

sub domainID {
  my %args = @_;

  _commoncheck(\%args, 'y');

  my $domid = $dnsdb->domainID($args{domain}, $args{location});
  die $dnsdb->errstr."\n" if !$domid;
  return $domid;
}

#sub revID {}

sub addRDNS {
  my %args = @_;

  _commoncheck(\%args, 'y');

  my ($code, $msg) = $dnsdb->addRDNS($args{revzone}, $args{revpatt}, $args{group}, $args{state}, $args{defloc});
  die "$msg\n" if $code eq 'FAIL';
  return $msg;	# zone ID
}

#sub getZoneCount {}
#sub getZoneList {}
#sub getZoneLocation {}

sub addGroup {
  my %args = @_;

  _commoncheck(\%args, 'y');
  die "Missing new group name\n" if !$args{groupname};
  die "Missing parent group ID\n" if !$args{parent_id};

# not sure how to usefully represent permissions via RPC.  :/
# not to mention, permissions are checked at the UI layer, not the DB layer.
  my $perms = {domain_edit => 1, domain_create => 1, domain_delete => 1,
	record_edit => 1, record_create => 1, record_delete => 1
	};
## optional $inhert arg?
  my ($code,$msg) = $dnsdb->addGroup($args{groupname}, $args{parent_id}, $perms);
  die "$msg\n" if $code eq 'FAIL';
  return $msg;
}

sub delGroup {
  my %args = @_;

  _commoncheck(\%args, 'y');
  die "Missing group ID or name to remove\n" if !$args{group};

  my ($code,$msg);
  # Let's be nice;  delete based on groupid OR group name.  Saves an RPC call round-trip, maybe.
  if ($args{group} =~ /^\d+$/) {
    ($code,$msg) = $dnsdb->delGroup($args{group});
  } else {
    my $grpid = $dnsdb->groupID($args{group});
    die "Can't find group\n" if !$grpid;
    ($code,$msg) = $dnsdb->delGroup($grpid);
  }
  die "$msg\n" if $code eq 'FAIL';
  return $msg;
}

#sub getChildren {}
#sub groupName {}
#sub getGroupCount {}
#sub getGroupList {}
#sub groupID {}

sub addUser {
  my %args = @_;

  _commoncheck(\%args, 'y');

# not sure how to usefully represent permissions via RPC.  :/
# not to mention, permissions are checked at the UI layer, not the DB layer.
  # bend and twist;  get those arguments in in the right order!
  $args{type} = 'u' if !$args{type};
  $args{permstring} = 'i' if !defined($args{permstring});
  my @userargs = ($args{username}, $args{group}, $args{pass}, $args{state}, $args{type}, $args{permstring});
  for my $argname ('fname','lname','phone') {
    last if !$args{$argname};
    push @userargs, $args{$argname};
  }
  my ($code,$msg) = $dnsdb->addUser(@userargs);
  die "$msg\n" if $code eq 'FAIL';
  return $msg;
}

#sub getUserCount {}
#sub getUserList {}
#sub getUserDropdown {}
#sub checkUser {}

sub updateUser {
  my %args = @_;

  _commoncheck(\%args, 'y');

  die "Missing UID\n" if !$args{uid};

  # bend and twist;  get those arguments in in the right order!
  $args{type} = 'u' if !$args{type};
  my @userargs = ($args{uid}, $args{username}, $args{group}, $args{pass}, $args{state}, $args{type});
  for my $argname ('fname','lname','phone') {
    last if !$args{$argname};
    push @userargs, $args{$argname};
  }
##fixme:  also underlying in DNSDB::updateUser():  no way to just update this or that attribute;
#         have to pass them all in to be overwritten
  my ($code,$msg) = $dnsdb->updateUser(@userargs);
  die "$msg\n" if $code eq 'FAIL';
  return $msg;
}

sub delUser {
  my %args = @_;

  _commoncheck(\%args, 'y');

  die "Missing UID\n" if !$args{uid};
  my ($code,$msg) = $dnsdb->delUser($args{uid});
  die "$msg\n" if $code eq 'FAIL';
  return $msg;
}

#sub userFullName {}
#sub userStatus {}
#sub getUserData {}

#sub addLoc {}
#sub updateLoc {}
#sub delLoc {}
#sub getLoc {}
#sub getLocCount {}
#sub getLocList {}

sub getLocDropdown {
  my %args = @_;

  _commoncheck(\%args);
  $args{defloc} = '' if !$args{defloc};

  my $ret = $dnsdb->getLocDropdown($args{group}, $args{defloc});
  return $ret;
}

sub getSOA {
  my %args = @_;

  _commoncheck(\%args);

  _reccheck(\%args);

  my $ret = $dnsdb->getSOA($args{defrec}, $args{revrec}, $args{id});
  if (!$ret) {
    if ($args{defrec} eq 'y') {
      die "No default SOA record in group\n";
    } else {
      die "No SOA record in zone\n";
    }
  }
  return $ret;
}

#sub updateSOA {}

sub getRecLine {
  my %args = @_;

  _commoncheck(\%args);

  _reccheck(\%args);

  my $ret = $dnsdb->getRecLine($args{defrec}, $args{revrec}, $args{id});

  die $dnsdb->errstr."\n" if !$ret;

  return $ret;
}

sub getRecList {
  my %args = @_;

  _commoncheck(\%args);

  # deal gracefully with alternate calling convention for args{id}
  $args{id} = $args{ID} if !$args{id} && $args{ID};
  # ... and fail if we don't have one
  die "Missing zone ID\n" if !$args{id};

  # caller may not know about zone IDs.  accept the zone name, but require a location if so
  if ($args{id} !~ /^\d+$/) {
    die "Location required to use the zone name\n" if !defined($args{location});
  }

  # set some optional args
  $args{offset} = 0 if !$args{offset};
## for order, need to map input to column names
  $args{order} = 'host' if !$args{order};
  $args{direction} = 'ASC' if !$args{direction};
  $args{defrec} = 'n' if !$args{defrec};
  $args{revrec} = 'n' if !$args{revrec};

  # convert zone name to zone ID, if needed
  if ($args{defrec} eq 'n') {
    if ($args{revrec} eq 'n') {
      $args{id} = $dnsdb->domainID($args{id}, $args{location}) if $args{id} !~ /^\d+$/;
    } else {
      $args{id} = $dnsdb->revID($args{id}, $args{location}) if $args{id} !~ /^\d+$/
    }
  }

  # fail if we *still* don't have a valid zone ID
  die $dnsdb->errstr."\n" if !$args{id};

  # and finally retrieve the records.
  my $ret = $dnsdb->getRecList(defrec => $args{defrec}, revrec => $args{revrec}, id => $args{id},
	offset => $args{offset}, nrecs => $args{nrecs}, sortby => $args{sortby},
        sortorder => $args{sortorder}, filter => $args{filter});
  die $dnsdb->errstr."\n" if !$ret;

  return $ret;
}

sub getRecCount {
  my %args = @_;

  _commoncheck(\%args);

  _reccheck(\%args);

  # caller may not know about zone IDs.  accept the zone name, but require a location if so
  if ($args{id} !~ /^\d+$/) {
    die "Location required to use the zone name\n" if !defined($args{location});
  }

  # set some optional args
  $args{nrecs} = 'all' if !$args{nrecs};
  $args{nstart} = 0 if !$args{nstart};
## for order, need to map input to column names
  $args{order} = 'host' if !$args{order};
  $args{direction} = 'ASC' if !$args{direction};

  # convert zone name to zone ID, if needed
  if ($args{defrec} eq 'n') {
    if ($args{revrec} eq 'n') {
      $args{id} = $dnsdb->domainID($args{id}, $args{location}) if $args{id} !~ /^\d+$/;
    } else {
      $args{id} = $dnsdb->revID($args{id}, $args{location}) if $args{id} !~ /^\d+$/
    }
  }

  # fail if we *still* don't have a valid zone ID
  die $dnsdb->errstr."\n" if !$args{id};

  my $ret = $dnsdb->getRecCount(defrec => $args{defrec}, revrec => $args{revrec},
	id => $args{id}, filter => $args{filter});

  die $dnsdb->errstr."\n" if !$ret;

  return $ret;
} # getRecCount()

# The core sub uses references for some arguments to allow limited modification for
# normalization or type+zone matching/mapping/availability.
sub rpc_addRec {
  my %args = @_;

  _commoncheck(\%args, 'y');

  _reccheck(\%args);
  _loccheck(\%args);
  _ttlcheck(\%args);

  # allow passing text types rather than DNS integer IDs
  $args{type} = $DNSDB::reverse_typemap{$args{type}} if $args{type} !~ /^\d+$/;

  my @recargs = ($args{defrec}, $args{revrec}, $args{parent_id},
	\$args{name}, \$args{type}, \$args{address}, $args{ttl}, $args{location},
	$args{expires}, $args{stamp});
  if ($args{type} == $DNSDB::reverse_typemap{MX} or $args{type} == $DNSDB::reverse_typemap{SRV}) {
    push @recargs, $args{distance};
    if ($args{type} == $DNSDB::reverse_typemap{SRV}) {
      push @recargs, $args{weight};
      push @recargs, $args{port};
    }
  }

  my ($code, $msg) = $dnsdb->addRec(@recargs);

  die "$msg\n" if $code eq 'FAIL';
  return $msg;
} # rpc_addRec

sub rpc_updateRec {
  my %args = @_;

  _commoncheck(\%args, 'y');

  _reccheck(\%args);

  # put some caller-friendly names in their rightful DB column places
  $args{val} = $args{address} if !$args{val};
  $args{host} = $args{name} if !$args{host};

  # get old line, so we can update only the bits that the caller passed to change
  my $oldrec = $dnsdb->getRecLine($args{defrec}, $args{revrec}, $args{id});
  foreach my $field (qw(host type val ttl location expires distance weight port)) {
    $args{$field} = $oldrec->{$field} if !$args{$field} && defined($oldrec->{$field});
  }
  # stamp has special handling when blank or 0.  "undefined" from the caller should mean "don't change"
  $args{stamp} = $oldrec->{stamp} if !defined($args{stamp}) && $oldrec->{stampactive};

  # allow passing text types rather than DNS integer IDs
  $args{type} = $DNSDB::reverse_typemap{$args{type}} if $args{type} !~ /^\d+$/;

  # note dist, weight, port are not required on all types;  will be ignored if not needed.
  # parent_id is the "primary" zone we're updating;  necessary for forward/reverse voodoo
  my ($code, $msg) = $dnsdb->updateRec($args{defrec}, $args{revrec}, $args{id}, $args{parent_id},
	\$args{host}, \$args{type}, \$args{val}, $args{ttl}, $args{location},
	$args{expires}, $args{stamp},
	$args{distance}, $args{weight}, $args{port});

  die "$msg\n" if $code eq 'FAIL';
  return $msg;
} # rpc_updateRec


# Takes a passed CIDR block and DNS pattern;  adds a new record or updates the record(s) affected
sub addOrUpdateRevRec {
  my %args = @_;

  _commoncheck(\%args, 'y');
  my $cidr = new NetAddr::IP $args{cidr};

  # Location required so we don't turn up unrelated zones in getZonesByCIDR().
  # Caller should generally have some knowledge of this.
  die "Need location\n" if !defined($args{location});

  my $zonelist = $dnsdb->getZonesByCIDR(%args);
  if (scalar(@$zonelist) == 0) {
    # enhh....  WTF?
  } elsif (scalar(@$zonelist) == 1) {
    # check if the single zone returned is bigger than the CIDR.  if so, we can just add a record
    my $zone = new NetAddr::IP $zonelist->[0]->{revnet};
    if ($zone->contains($cidr)) {
      # We need to strip the CIDR mask on IPv4 /32 or v6 /128 assignments, or we just add a new record all the time.
      my $filt = ( $cidr->{isv6} ? ($cidr->masklen != 128 ? "$cidr" : $cidr->addr) :
		   ($cidr->masklen != 32 ? "$cidr" : $cidr->addr) );
      my $reclist = $dnsdb->getRecList(rpc => 1, defrec => 'n', revrec => 'y',
        id => $zonelist->[0]->{rdns_id}, filter => $filt);
##fixme: Figure some new magic to automerge new incoming A(AAA)+PTR requests
# with existing A records to prevent duplication of A(AAA) records
      if (scalar(@$reclist) == 0) {
        # Aren't Magic Numbers Fun?  See pseudotype list in dnsadmin.
        my $type = ($cidr->{isv6} ? ($cidr->masklen == 128 ? 65281 : 65284) : ($cidr->masklen == 32 ? 65280 : 65283) );
        rpc_addRec(defrec => 'n', revrec => 'y', parent_id => $zonelist->[0]->{rdns_id}, type => $type,
          address => "$cidr", %args);
      } else {
        my $flag = 0;
        foreach my $rec (@$reclist) {
          # pure PTR plus composite types
          next unless $rec->{type} == 12 || $rec->{type} == 65280 || $rec->{type} == 65281
                || $rec->{type} == 65282 || $rec->{type} == 65283 || $rec->{type} == 65284;
          next unless $rec->{val} eq $filt;	# make sure we really update the record we want to update.
          # canonicalize the IP values so funny IPv6 short forms don't
          # cause non-updates by not being literally string-equal
          $rec->{val} = new NetAddr::IP $rec->{val};
          my $tmpcidr = new NetAddr::IP $args{cidr};
          my %newrec = (host => $args{name}, val => $tmpcidr, type => $args{type});
          rpc_updateRec(defrec =>'n', revrec => 'y', id => $rec->{record_id},
                parent_id => $zonelist->[0]->{rdns_id}, address => "$cidr", %args)
                if _checkRecMod($rec, \%newrec);	# and only do the update if there really is something to change
          $flag = 1;
          last;	# only do one record.
        }
        unless ($flag) {
          # Nothing was updated, so we didn't really have a match.  Add as per @$reclist==0
          # Aren't Magic Numbers Fun?  See pseudotype list in dnsadmin.
          my $type = ($cidr->{isv6} ? 65282 : ($cidr->masklen == 32 ? 65280 : 65283) );
          rpc_addRec(defrec => 'n', revrec => 'y', parent_id => $zonelist->[0]->{rdns_id}, type => $type,
            address => "$cidr", %args);
        }
      }
    } else {
      # ebbeh?  CIDR is only partly represented in DNS.  This needs manual intervention.
    } # done single-zone-contains-$cidr
  } else {
    # Overlapping reverse zones shouldn't be possible, so if we're here we've got a CIDR
    # that spans multiple reverse zones (eg, /23 CIDR -> 2 /24 rzones)
    foreach my $zdata (@$zonelist) {
      my $reclist = $dnsdb->getRecList(rpc => 1, defrec => 'n', revrec => 'y',
        id => $zdata->{rdns_id}, filter => $zdata->{revnet});
      if (scalar(@$reclist) == 0) {
        my $type = ($args{cidr}->{isv6} ? 65282 : ($args{cidr}->masklen == 32 ? 65280 : 65283) );
        rpc_addRec(defrec => 'n', revrec => 'y', parent_id => $zdata->{rdns_id}, type => $type,
          address => "$args{cidr}", %args);
      } else {
        my $updflag = 0;
        foreach my $rec (@$reclist) {
          # only the composite and/or template types;  pure PTR or nontemplate composite
          # types are nominally impossible here.
          next unless $rec->{type} == 65282 || $rec->{type} == 65283 || $rec->{type} == 65284;
          my %newrec = (host => $args{name}, val => $zdata->{revnet}, type => $args{type});
          rpc_updateRec(defrec => 'n', revrec => 'y', id => $rec->{record_id},
            parent_id => $zdata->{rdns_id}, %args)
            if _checkRecMod($rec, \%newrec);	# and only do the update if there really is something to change
          $updflag = 1;
          last;	# only do one record.
        }
        # catch the case of "oops, no zone-sized template record and need to add a new one",
        # because the SOA and NS records will be returned from the getRecList() call above
        unless ($updflag) {
          my $type = ($cidr->{isv6} ? 65284 : 65283);
          rpc_addRec(defrec => 'n', revrec => 'y', parent_id => $zdata->{rdns_id}, type => $type,
            address => $zdata->{revnet}, %args);
        }
      } # scalar(@$reclist) != 0
    } # iterate zones within $cidr
  } # done $cidr-contains-zones
##fixme:  what about errors?  what about warnings?
} # done addOrUpdateRevRec()

# Update rDNS on a whole batch of IP addresses.  Presented as a separate sub via RPC
# since RPC calls can be s...l...o...w....
sub updateRevSet {
  my %args = @_;

  _commoncheck(\%args, 'y');

  my @ret;
  # loop over passed IP/hostname pairs
  foreach my $key (keys %args) {
    next unless $key =~ m{^host_((?:[\d.]+|[\da-f:]+)(?:/\d+)?)$};
    my $ip = $1;
    push @ret, addOrUpdateRevRec(%args, cidr => $ip, name => $args{$key});
  }

  # now we check the parts of the block that didn't get passed to see if they should be deleted
  my $block = new NetAddr::IP $args{cidr};
  if (!$block->{isv6}) {
    foreach my $ip (@{$block->splitref(32)}) {
      my $bare = $ip->addr;
      next if $args{"host_$bare"};
      delByCIDR(delforward => 1, delsubs => 0, cidr => $bare, location => $args{location},
	rpcuser => $args{rpcuser}, rpcsystem => $args{rpcsystem});
    }
  }

##fixme:  what about errors?  what about warnings?
  return \@ret;
} # done updateRevSet()

# Split a template record as per a passed CIDR.
# Requires the CIDR and the new mask length
sub splitTemplate {
  my %args = @_;

  _commoncheck(\%args, 'y');

  my $cidr = new NetAddr::IP $args{cidr};

  # Location required so we don't turn up unrelated zones in getZonesByCIDR().
  # Caller should generally have some knowledge of this.
  die "Need location\n" if !defined($args{location});

  my $zonelist = $dnsdb->getZonesByCIDR(%args);

  if (scalar(@$zonelist) == 0) {
    # enhh....  WTF?

  } elsif (scalar(@$zonelist) == 1) {
    my $zone = new NetAddr::IP $zonelist->[0]->{revnet};
    if ($zone->contains($cidr)) {
      # Find the first record in the reverse zone that matches the CIDR we're splitting...
      my $reclist = $dnsdb->getRecList(rpc => 1, defrec => 'n', revrec => 'y',
        id => $zonelist->[0]->{rdns_id}, filter => $cidr, sortby => 'val', sortorder => 'DESC');
      my $oldrec;
      foreach my $rec (@$reclist) {
        my $reccidr = new NetAddr::IP $rec->{val};
        next unless $cidr->contains($reccidr);  # not sure this is needed here
        # ... and is a reverse-template type.
        # Could arguably trim the list below to just 65282, 65283, 65284
        next unless $rec->{type} == 12 || $rec->{type} == 65280 || $rec->{type} == 65281 ||
            $rec->{type} == 65282 || $rec->{type} == 65283 ||$rec->{type} == 65284;
        # snag old record so we can copy its data
        $oldrec = $dnsdb->getRecLine('n', 'y', $rec->{record_id});
        last;  # we've found one record that meets our criteria;  Extras Are Irrelevant
      }

      my @newblocks = $cidr->split($args{newmask});
      # Change the existing record with the new CIDR
      my $up_res = rpc_updateRec(%args, val => $newblocks[0], id => $oldrec->{record_id}, defrec => 'n', revrec => 'y');
      my @ret;
      # the update is assumed to have succeeded if it didn't fail.
##fixme:  find a way to save and return "warning" states?
      push @ret, {block => "$newblocks[0]", code => "OK", msg => $up_res};
      # And now add new record(s) for each of the new CIDR entries, reusing the old data
      for (my $i = 1; $i <= $#newblocks; $i++) {
        my $newval = "$newblocks[$i]";
        my @recargs = ('n', 'y', $oldrec->{rdns_id}, \$oldrec->{host}, \$oldrec->{type}, \$newval,
          $oldrec->{ttl}, $oldrec->{location}, 0, '');
        my ($code, $msg) = $dnsdb->addRec(@recargs);
        # Note failures here are not fatal;  this should typically only ever be called by IPDB
        push @ret, {block => "$newblocks[$i]", code => $code, msg => $up_res};
      }
      # return an info hash in case of warnings doing the update or add(s)
      return \@ret;

    } else {  # $cidr > $zone but we only have one zone
      # ebbeh?  CIDR is only partly represented in DNS.  This needs manual intervention.
      return "Warning:  $args{cidr} is only partly represented in DNS.  Check and update DNS records manually.";
    } # done single-zone-contains-$cidr

  } else {
    # multiple zones nominally "contain" $cidr
  } # done $cidr-contains-zones

} # done splitTemplate()

# Resize a template according to an old/new CIDR pair
# Takes the old cidr in $args{oldcidr} and the new in $args{newcidr}
sub resizeTemplate {
  my %args = @_;

  _commoncheck(\%args, 'y');

  my $oldcidr = new NetAddr::IP $args{oldcidr};
  my $newcidr = new NetAddr::IP $args{newcidr};
  die "$oldcidr and $newcidr do not overlap"
      unless $oldcidr->contains($newcidr) || $newcidr->contains($oldcidr);
  $args{cidr} = $args{oldcidr};

  my $up_res;

  # Location required so we don't turn up unrelated zones in getZonesByCIDR().
  # Caller should generally have some knowledge of this.
  die "Need location\n" if !defined($args{location});

  my $zonelist = $dnsdb->getZonesByCIDR(%args);
  if (scalar(@$zonelist) == 0) {
    # enhh....  WTF?

  } elsif (scalar(@$zonelist) == 1) {
    my $zone = new NetAddr::IP $zonelist->[0]->{revnet};
    if ($zone->contains($oldcidr)) {
      # Find record(s) matching the old and new CIDR

      my $sql = q(
          SELECT record_id,host,val
          FROM records
          WHERE rdns_id = ?
              AND type IN (12, 65280, 65281, 65282, 65283, 65284)
              AND (val = ? OR val = ?)
          ORDER BY masklen(inetlazy(val)) ASC
      );
      my $sth = $dnsdb->{dbh}->prepare($sql);
      $sth->execute($zonelist->[0]->{rdns_id}, "$oldcidr", "$newcidr");
      my $upd_id;
      my $oldhost;
      while (my ($recid, $host, $val) = $sth->fetchrow_array) {
        my $tcidr = NetAddr::IP->new($val);
        if ($tcidr == $newcidr) {
          # Match found for new CIDR.  Delete this record.
          $up_res = $dnsdb->delRec('n', 'y', $recid);
        } else {
          # Update this record, then exit the loop
          $up_res = rpc_updateRec(%args, val => $newcidr, id => $recid, defrec => 'n', revrec => 'y');
          last;
        }
        # Your llama is on fire
      }
      $sth->finish;

      return "Template record for $oldcidr changed to $newcidr.";

    } else {  # $cidr > $zone but we only have one zone
      # ebbeh?  CIDR is only partly represented in DNS.  This needs manual intervention.
      return "Warning:  $args{cidr} is only partly represented in DNS.  Check and update DNS records manually.";
    } # done single-zone-contains-$cidr

  } else {
    # multiple zones nominally "contain" $cidr
  }

  return $up_res;
} # done resizeTemplate()

# Convert one or more template records to a set of individual IP records.  Expands the template.
# Handle the case of nested templates, although the primary caller (IPDB) should not be
# able to generate records that would trigger that case.
# Accounts for existing PTR or A+PTR records same as on-export template expansion.
# Takes a list of templates and a bounding CIDR?
sub templatesToRecords {
  my %args = @_;

  _commoncheck(\%args, 'y');

  my %iplist;
  my @retlist;

  # Location required so we don't turn up unrelated zones
  die "Need location\n" if !defined($args{location});

  my $zsth = $dnsdb->{dbh}->prepare("SELECT rdns_id,group_id FROM revzones WHERE revnet >>= ? AND location = ?");
  # Going to assume template records with no expiry
  # Also note IPv6 template records don't expand sanely the way v4 records do
  my $recsth = $dnsdb->{dbh}->prepare(q(
      SELECT record_id, domain_id, host, type, val, ttl, location
      FROM records
      WHERE rdns_id = ?
          AND type IN (12, 65280, 65282, 65283)
          AND inetlazy(val) <<= ?
      ORDER BY masklen(inetlazy(val)) DESC
  ));
  my $insth = $dnsdb->{dbh}->prepare("INSERT INTO records (domain_id, rdns_id, host, type, val, ttl, location)". 
	" VALUES (?,?,?,?,?,?,?)");
  my $delsth = $dnsdb->{dbh}->prepare("DELETE FROM records WHERE record_id = ?");
  my %typedown = (12 => 12, 65280 => 65280, 65281 => 65281, 65282 => 12, 65283 => 65280, 65284 => 65281);

  my @checkrange;

  local $dnsdb->{dbh}->{AutoCommit} = 0;
  local $dnsdb->{dbh}->{RaiseError} = 1;

  eval {
    foreach my $template (@{$args{templates}}) {
      $zsth->execute($template, $args{location});
      my ($zid,$zgrp) = $zsth->fetchrow_array;
      if (!$zid) {
        push @retlist, {$template, "Zone not found"};
        next;
      }
      $recsth->execute($zid, $template);
      while (my ($recid, $domid, $host, $type, $val, $ttl, $loc) = $recsth->fetchrow_array) {
        # Skip single IPs with PTR or A+PTR records
        if ($type == 12 || $type == 65280) {
          $iplist{"$val/32"}++;
          next;
        }
        my @newips = NetAddr::IP->new($template)->split(32);
        $type = $typedown{$type};
        foreach my $ip (@newips) {
          next if $iplist{$ip};
          my $newhost = $host;
          $dnsdb->_template4_expand(\$newhost, $ip->addr);
          $insth->execute($domid, $zid, $newhost, $type, $ip->addr, $ttl, $loc);
          $iplist{$ip}++;
        }
        $delsth->execute($recid);
        $dnsdb->_log(group_id => $zgrp, domain_id => $domid, rdns_id => $zid,
            entry => "$template converted to individual $typemap{$type} records");
        push @retlist, "$template converted to individual records";
      } # record fetch
    } # foreach passed template CIDR

    $dnsdb->{dbh}->commit;
  };
  if ($@) {
    die "Error converting a template record to individual records: $@";
  }

  return \@retlist;

} # done templatesToRecords()

sub delRec {
  my %args = @_;

  _commoncheck(\%args, 'y');

  _reccheck(\%args);

  my ($code, $msg) = $dnsdb->delRec($args{defrec}, $args{revrec}, $args{id});

  die "$msg\n" if $code eq 'FAIL';
  return $msg;
}

sub delByCIDR {
  my %args = @_;

  _commoncheck(\%args, 'y');

  # Caller may pass 'n' in delsubs.  Assume it should be false/undefined
  # unless the caller explicitly requested 'yes'
  $args{delsubs} = 0 if !$args{delsubs} || $args{delsubs} ne 'y';

  # Don't delete the A component of an A+PTR by default
  $args{delforward} = 0 if !$args{delforward};

  # Location required so we don't turn up unrelated zones in getZonesByCIDR().
  die "Need location\n" if !defined($args{location});

  # much like addOrUpdateRevRec()
  my $zonelist = $dnsdb->getZonesByCIDR(%args);
  my $cidr = new NetAddr::IP $args{cidr};

  if (scalar(@$zonelist) == 0) {
    # enhh....  WTF?
  } elsif (scalar(@$zonelist) == 1) {

    # check if the single zone returned is bigger than the CIDR
    my $zone = new NetAddr::IP $zonelist->[0]->{revnet};
    if ($zone->contains($cidr)) {
      if ($args{delsubs}) {
        # Delete ALL EVARYTHING!!one11!! in $args{cidr}
        my $reclist = $dnsdb->getRecList(rpc => 1, defrec => 'n', revrec => 'y', id => $zonelist->[0]->{rdns_id});
        foreach my $rec (@$reclist) {
          my $reccidr = new NetAddr::IP $rec->{val};
          next unless $cidr->contains($reccidr);
          next unless $rec->{type} == 12 || $rec->{type} == 65280 || $rec->{type} == 65281 ||
                      $rec->{type} == 65282 || $rec->{type} == 65283 ||$rec->{type} == 65284;
          ##fixme:  multiple records, wanna wax'em all, how to report errors?
          if ($args{delforward} ||
              $rec->{type} == 12 || $rec->{type} == 65282 ||
              $rec->{type} == 65283 || $rec->{type} == 65284) {
            my ($code,$msg) = $dnsdb->delRec('n', 'y', $rec->{record_id});
          } else {
##fixme: AAAA+PTR?
            my $ret = $dnsdb->downconvert($rec->{record_id}, $DNSDB::reverse_typemap{A});
          }
        }
        if ($args{parpatt} && $zone == $cidr) {
          # Edge case;  we've just gone and axed all the records in the reverse zone.
          # Re-add one to match the parent if we've been given a pattern to use.
          rpc_addRec(defrec => 'n', revrec => 'y', parent_id => $zonelist->[0]->{rdns_id},
                 type => ($zone->{isv6} ? 65284 : 65283), address => "$cidr", name => $args{parpatt}, %args);
        }

      } else {
        # Selectively delete only exact matches on $args{cidr}
        # We need to strip the CIDR mask on IPv4 /32 assignments, or we can't find single-IP records
        my $filt = ( $cidr->{isv6} ? ($cidr->masklen != 128 ? "$cidr" : $cidr->addr) :
		     ($cidr->masklen != 32 ? "$cidr" : $cidr->addr) );
        my $reclist = $dnsdb->getRecList(rpc => 1, defrec => 'n', revrec => 'y', location => $args{location},
          id => $zonelist->[0]->{rdns_id}, filter => $filt, sortby => 'val', sortorder => 'DESC');
        foreach my $rec (@$reclist) {
          my $reccidr = new NetAddr::IP $rec->{val};
          next unless $cidr == $reccidr;
          next unless $rec->{type} == 12 || $rec->{type} == 65280 || $rec->{type} == 65281 ||
                      $rec->{type} == 65282 || $rec->{type} == 65283 ||$rec->{type} == 65284;
          if ($args{delforward} || $rec->{type} == 12) {
            my ($code,$msg) = $dnsdb->delRec('n', 'y', $rec->{record_id});
            die "$msg\n" if $code eq 'FAIL';
            return $msg;
          } else {
            my $ret = $dnsdb->downconvert($rec->{record_id}, $DNSDB::reverse_typemap{A});
            die $dnsdb->errstr."\n" if !$ret;
            return "A+PTR for $args{cidr} split and PTR removed";
          }
        } # foreach @$reclist
      }

    } else {  # $cidr > $zone but we only have one zone
      # ebbeh?  CIDR is only partly represented in DNS.  This needs manual intervention.
      return "Warning:  $args{cidr} is only partly represented in DNS.  Check and remove DNS records manually.";
    } # done single-zone-contains-$cidr

  } else {  # multiple zones nominally "contain" $cidr
    # Overlapping reverse zones shouldn't be possible, so if we're here we've got a CIDR
    # that spans multiple reverse zones (eg, /23 CIDR -> 2 /24 rzones)
    foreach my $zdata (@$zonelist) {
      my $reclist = $dnsdb->getRecList(rpc => 1, defrec => 'n', revrec => 'y', id => $zdata->{rdns_id});
      if (scalar(@$reclist) == 0) {
# nothing to do?  or do we (re)add a record based on the parent?
# yes, yes we do, past the close of the else
#        my $type = ($args{cidr}->{isv6} ? 65282 : ($args{cidr}->masklen == 32 ? 65280 : 65283) );
#        rpc_addRec(defrec => 'n', revrec => 'y', parent_id => $zdata->{rdns_id}, type => $type,
#          address => "$args{cidr}", %args);
      } else {
        foreach my $rec (@$reclist) {
          next unless $rec->{type} == 12 || $rec->{type} == 65280 || $rec->{type} == 65281 ||
                      $rec->{type} == 65282 || $rec->{type} == 65283 || $rec->{type} == 65284;
          # Template types are only useful when attached to a reverse zone.
##fixme  ..... or ARE THEY?
          if ($args{delforward} ||
              $rec->{type} == 12 || $rec->{type} == 65282 ||
              $rec->{type} == 65283 || $rec->{type} == 65284) {
            my ($code,$msg) = $dnsdb->delRec('n', 'y', $rec->{record_id});
          } else {
            my $ret = $dnsdb->downconvert($rec->{record_id}, $DNSDB::reverse_typemap{A});
          }
        } # foreach @$reclist
      } # nrecs != 0
      if ($args{parpatt}) {
        # We've just gone and axed all the records in the reverse zone.
        # Re-add one to match the parent if we've been given a pattern to use.
        rpc_addRec(defrec => 'n', revrec => 'y', parent_id => $zdata->{rdns_id},
               type => ($cidr->{isv6} ? 65284 : 65283),
               address => $zdata->{revnet}, name => $args{parpatt}, %args);
      }
    } # iterate zones within $cidr
  } # done $cidr-contains-zones

} # end delByCIDR()

# Batch-delete a set of reverse entries similar to updateRevSet
sub delRevSet {
  my %args = @_;

  _commoncheck(\%args, 'y');

  my @ret;
  # loop over passed CIDRs in args{cidrlist}
  foreach my $cidr (split(',', $args{cidrlist})) {
    push @ret, delByCIDR(cidr => $cidr, %args)
  }

  return \@ret;  
} # end delRevSet()

#sub getLogCount {}
#sub getLogEntries {}

sub getRevPattern {
  my %args = @_;

  _commoncheck(\%args, 'y');

  return $dnsdb->getRevPattern($args{cidr}, location => $args{location}, group => $args{group});
}

sub getRevSet {
  my %args = @_;

  _commoncheck(\%args, 'y');

  return $dnsdb->getRevSet($args{cidr}, location => $args{location}, group => $args{group});
}

sub getTypelist {
  my %args = @_;
  _commoncheck(\%args, 'y');

  $args{selected} = $reverse_typemap{A} if !$args{selected};

  return $dnsdb->getTypelist($args{recgroup}, $args{selected});
}

sub getTypemap {
  my %args = @_;
  _commoncheck(\%args, 'y');
  return \%typemap;
}

sub getReverse_typemap {
  my %args = @_;
  _commoncheck(\%args, 'y');
  return \%reverse_typemap;
}

#sub parentID {}
#sub isParent {}

sub zoneStatus {
  my %args = @_;

  _commoncheck(\%args, 'y');

  $args{reverse} = 'n' if !$args{reverse} || $args{reverse} ne 'y';
  my @arglist = ($args{zoneid}, $args{reverse});
  push @arglist, $args{status} if defined($args{status});

  my $status = $dnsdb->zoneStatus(@arglist);
}

# Get a list of hashes referencing the reverse zone(s) for a passed CIDR block
sub getZonesByCIDR {
  my %args = @_;

  _commoncheck(\%args, 'y');

  return $dnsdb->getZonesByCIDR(%args);
}

#sub importAXFR {}
#sub importBIND {}
#sub import_tinydns {}
#sub export {}
#sub __export_tiny {}
#sub _printrec_tiny {}
#sub mailNotify {}

sub get_method_list {
  my @methods = keys %{$methods};
  return \@methods;
}