#!/usr/bin/perl
# XMLRPC interface to manipulate most DNS DB entities
###
# $Id: ipdb-rpc.cgi 838 2016-04-12 17:53:37Z kdeugau $
###
# Copyright (C) 2013,2014,2016 Kris Deugau <kdeugau@deepnet.cx>

use strict;
use warnings;

use DBI;
use CustIDCK;
use NetAddr::IP;
use FCGI;
use Frontier::Responder;

use Sys::Syslog;

# don't remove!  required for GNU/FHS-ish install from tarball
##uselib##

use MyIPDB;

openlog "IPDB-rpc","pid","$IPDB::syslog_facility";

##fixme:  username source?  can we leverage some other auth method?
# we don't care except for logging here, and Frontier::Client needs
# a patch that's not well-distributed to use HTTP AUTH.

# Collect the username from HTTP auth.  If undefined, we're in
# a test environment, or called without a username.
my $authuser;
if (!defined($ENV{'REMOTE_USER'})) {
  $authuser = '__temptest';
} else {
  $authuser = $ENV{'REMOTE_USER'};
}

# Why not a global DB handle?  (And a global statement handle, as well...)
# Use the connectDB function, otherwise we end up confusing ourselves
my $ip_dbh;
my $sth;
my $errstr;
($ip_dbh,$errstr) = connectDB_My;
initIPDBGlobals($ip_dbh);

my $methods = {
	# Internal core IPDB subs;  no value in exposing them since the DB handle can't be used by the caller
	#'ipdb._rpc'
	# This one could be exposed, but the globals aren't automatically
	# inherited by the caller anyway, and we call it just above locally.
	#'ipdb.initIPDBGlobals'
	#'ipdb.connectDB'
	#'ipdb.finish'
	#'ipdb.checkDBSanity'
	'ipdb.addMaster'	=>	\&rpc_addMaster,
	'ipdb.touchMaster'	=>	\&rpc_touchMaster,
	'ipdb.listSummary'	=>	\&rpc_listSummary,
	'ipdb.listSubs'	=>	\&rpc_listSubs,
	'ipdb.listContainers'	=>	\&rpc_listContainers,
	'ipdb.listAllocations'	=>	\&rpc_listAllocations,
	'ipdb.listFree'	=>	\&rpc_listFree,
	'ipdb.listPool'	=>	\&rpc_listPool,
	'ipdb.getMasterList'	=>	\&rpc_getMasterList,
	'ipdb.getTypeList'	=>	\&rpc_getTypeList,
	'ipdb.getPoolSelect'	=>	\&rpc_getPoolSelect,
	'ipdb.findAllocateFrom'	=>	\&rpc_findAllocateFrom,
	'ipdb.ipParent'	=>	\&rpc_ipParent,
	'ipdb.subParent'	=>	\&rpc_subParent,
	'ipdb.blockParent'	=>	\&rpc_blockParent,
	'ipdb.getRoutedCity'	=>	\&rpc_getRoutedCity,
	'ipdb.allocateBlock'	=>	\&rpc_allocateBlock,
	# another internal sub;  mainly a sub to make allocateBlock() a lot smaller
	#'ipdb.initPool'	=>	\&rpc_initPool
	'ipdb.updateBlock'	=>	\&rpc_updateBlock,
	'ipdb.deleteBlock'	=>	\&rpc_deleteBlock,
	'ipdb.getBlockData'	=>	\&rpc_getBlockData,
	'ipdb.getBlockRDNS'	=>	\&rpc_getBlockRDNS,
	'ipdb.getNodeList'	=>	\&rpc_getNodeList,
	'ipdb.getNodeName'	=>	\&rpc_getNodeName,
	'ipdb.getNodeInfo'	=>	\&rpc_getNodeInfo,
	'ipdb.mailNotify'	=>	\&rpc_mailNotify,

# Subs not part of the core IPDB
	'ipdb.getDispAlloctypes'	=> \&rpc_getDispAlloctypes,
	'ipdb.getListAlloctypes'	=> \&rpc_getListAlloctypes,
	'ipdb.getDefCustIDs'	=> \&rpc_getDefCustIDs,
	'ipdb.getCityList'	=> \&rpc_getCityList,
	'ipdb.getAvailableStatics'	=> \&rpc_getAvailableStatics,
};

my $reqcnt = 0;

# main FCGI loop.
while (FCGI::accept >= 0) {
  # done here to a) prevent $ENV{'REMOTE_ADDR'} from being empty and b) to collect
  # the right user for the individual call (since we may be running with FCGI)
  syslog "debug", "$authuser active, $ENV{'REMOTE_ADDR'}";

  # don't *think* we need any of these...
  # %disp_alloctypes, %def_custids, %list_alloctypes
  # @citylist, @poplist
  # @masterblocks, %allocated, %free, %bigfree, %routed  (removed in /trunk)
  # %IPDBacl
  #initIPDBGlobals($ip_dbh);

  my $res = Frontier::Responder->new(
        methods => $methods
        );

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

exit 0;


##
## Private subs
##

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

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};
  }
}

# stripped-down copy from from main.cgi.  should probably be moved to IPDB.pm
sub _validateInput {
  my $argref = shift;

  if (!$argref->{block}) {
    $argref->{block} = $argref->{cidr} if $argref->{cidr};
    die "Block/IP is required\n" if !$argref->{block};
  }

  # Alloctype check.
  chomp $argref->{type};

  die "Invalid allocation type\n" if (!grep /$argref->{type}/, keys %disp_alloctypes);

  # Arguably not quite correct, as the custID won't be checked for
  # validity if there's a default on the type.
  if ($def_custids{$argref->{type}} eq '') {
    # Types without a default custID must have one passed in
    die "Customer ID is required\n" if !$argref->{custid};
    # Crosscheck with billing.
    my $status = CustIDCK->custid_exist($argref->{custid});
    die "Error verifying customer ID: $CustIDCK::ErrMsg\n" if $CustIDCK::Error;
    die "Customer ID not valid\n" if !$status;
  } else {
    # Types that have a default will use it unless one is specified.
    if ((!$argref->{custid}) || ($argref->{custid} ne 'STAFF')) {
      $argref->{custid} = $def_custids{$argref->{type}};
    }
  }
} # end validateInput()


##
## RPC method subs
##

# Core IPDB subs
# Prefixed with rpc_ to not conflict with subs in IPDB.pm

# These are deep internals and don't make much sense to expose, since RPC
# by definition does not access the backing DB directly.
#sub _rpc {}
#sub initIPDBGlobals {}
#sub connectDB {}
#sub finish {}
#sub checkDBSanity {}

sub rpc_addMaster {}
sub rpc_touchMaster {}
sub rpc_listSummary {}
sub rpc_listSubs {}
sub rpc_listContainers {}
sub rpc_listAllocations {}
sub rpc_listFree {}
sub rpc_listPool {}
sub rpc_getMasterList {}
sub rpc_getTypeList {}
sub rpc_getPoolSelect {}
sub rpc_findAllocateFrom {}
sub rpc_ipParent {}
sub rpc_subParent {}
sub rpc_blockParent {}
sub rpc_getRoutedCity {}

sub rpc_allocateBlock {
  my %args = @_;

  _commoncheck(\%args, 'y');

  _validateInput(\%args);

  # Not required for update, delete
  die "City is required\n" if !$args{city};
  die "Customer ID is required\n" if !$args{custid};
  die "Allocation type is required\n" if !$args{type};

  if ($args{type} =~ /^.i$/) {
    die "Pool ID or VRF to allocate from is required\n" if !$args{parent} && !$args{vrf};
  } else {
    die "Free block to allocate from is required\n" if !$args{fbid};
  }

  my ($code,$msg) = allocateBlock($ip_dbh, %args);

  if ($code eq 'OK' || $code eq 'WARN') {
    if ($args{type} =~ /^.i$/) {
      $msg =~ s|/32||;
      mailNotify($ip_dbh, "a$args{type}", "ADDED: $disp_alloctypes{$args{type}} allocation",
        "$disp_alloctypes{$args{type}} $msg allocated to customer $args{custid}\n".
        "Description: $args{desc}\n\nAllocated by: $args{rpcsystem}/$args{rpcuser}\n");
    } else {
      my $netblock = new NetAddr::IP $args{block};
      mailNotify($ip_dbh, "a$args{type}", "ADDED: $disp_alloctypes{$args{type}} allocation",
        "$disp_alloctypes{$args{type}} $args{block} allocated to customer $args{custid}\n".
        "Description: $args{desc}\n\nAllocated by: $args{rpcsystem}/$args{rpcuser}\n");
    }
    syslog "notice", "$args{rpcsystem}/$args{rpcuser} allocated '$args{block}' to '$args{custid}' as ".
        "'$args{type}' ($msg)";
  } else {
    syslog "err", "Allocation of '$args{block}' to '$args{custid}' as ".
        "'$args{type}' by $args{rpcsystem}/$args{rpcuser} failed: '$msg'";
    die "$msg\n";
  }
  return $msg;
} # rpc_allocateBlock()

# another internal sub;  mainly a sub to make allocateBlock() a lot smaller
#sub rpc_initPool {}


sub rpc_updateBlock {
  my %args = @_;

  _commoncheck(\%args, 'y');

  _validateInput(\%args);

  # Allow caller to send a CIDR instead of the block ID.
  $args{origblock} = $args{block};
  if ($args{block} =~ m{^(?:\d+\.){3}\d+(?:/32)?$}) {
    # updating a static IP.  retrieve the IP ID based on either the parent or VRF.
    die "Pool ID or VRF is required\n" if !$args{parent} && !$args{vrf};
    ($args{block}) = $ip_dbh->selectrow_array(
       "SELECT id FROM poolips WHERE ip = ? AND ".($args{parent} ? "parent_id = ?" : "vrf = ?"),
       undef, $args{block}, ($args{parent} ? $args{parent} : $args{vrf}) );
  }

  my $binfo = getBlockData($ip_dbh, $args{block}, $args{type});

  # set assignIP_on_update to simplify some calling situations.  better to use allocateBlock if possible though.
  my ($code,$msg) = updateBlock($ip_dbh, %args, assignIP_on_update => 1);

  if ($code eq 'FAIL') {
    syslog "err", "$args{rpcsystem}/$args{rpcuser} could not update block/IP ID $args{block}: '$msg'";
    die "$msg\n";
  }

  syslog "notice", "$authuser updated $args{block}";

  return $msg;

} # rpc_updateBlock()


sub rpc_deleteBlock {}
sub rpc_getBlockData {}
sub rpc_getBlockRDNS {}
sub rpc_getNodeList {}
sub rpc_getNodeName {}
sub rpc_getNodeInfo {}
sub rpc_mailNotify {}


##
## Subs not part of the core IPDB
##

# Subs to send back IPDB globals

#our %disp_alloctypes;
sub rpc_getDispAlloctypes {
  my %args = @_;
  _commoncheck(\%args, 'n');
  return \%disp_alloctypes;
}

#our %list_alloctypes;
sub rpc_getListAlloctypes {
  my %args = @_;
  _commoncheck(\%args, 'n');
  return \%list_alloctypes;
}

#our %def_custids;
sub rpc_getDefCustIDs {
  my %args = @_;
  _commoncheck(\%args, 'n');
  return \%def_custids;
}

#our @citylist;
sub rpc_getCityList {
  my %args = @_;
  _commoncheck(\%args, 'n');
  return \@citylist;
}

#our @poplist;
sub rpc_getPOPList {
  my %args = @_;
  _commoncheck(\%args, 'n');
  return \@poplist;
}

# not sure how useful it is to expose this on RPC
#our %IPDBacl;
sub rpc_getIPDBacl {
  my %args = @_;
  _commoncheck(\%args, 'n');
  return \%IPDBacl;
}

# Operations not provided directly by the core IPDB

# Get a list of available static IPs of the given type
# Not a core IPDB sub since there's little use for this format.
sub rpc_getAvailableStatics {
  my %args = @_;

  _commoncheck(\%args, 'n');

  my ($base,undef) = split //, $args{type};
  $base .= "_";
  my @params = ($base);

  my $sql = "SELECT poolips.id,poolips.ip,poolips.parent_id,poolips.pool ".
	"FROM poolips JOIN allocations ON poolips.parent_id=allocations.id WHERE poolips.type LIKE ?";
  if ($base ne 'd_' && $args{city}) {
    $sql .= " AND allocations.city=?";
    push @params, $args{city};
  }
  $sql .= " AND poolips.available='y'";

  my $ret = $ip_dbh->selectall_arrayref($sql, { Slice => {} }, (@params) );
  die $ip_dbh->errstr if !$ret;

  return $ret;
} # rpc_getAvailableStatics()