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|
#!/usr/bin/perl
# udptunnel-reconf
# Set up the relevant stuff in /etc/userv/vpn, and then run
# this. It should tell you what to do to inittab and ipif-networks.
# This file is part of ipif, part of userv-utils
#
# Copyright 1996-2013 Ian Jackson <ijackson@chiark.greenend.org.uk>
# Copyright 1998 David Damerell <damerell@chiark.greenend.org.uk>
# Copyright 1999,2003
# Chancellor Masters and Scholars of the University of Cambridge
# Copyright 2010 Tony Finch <fanf@dotat.at>
#
# This 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 userv-utils; if not, see http://www.gnu.org/licenses/.
use Socket;
# @@@-
$shareuserv= "`pwd`";
$etcvpn= "`pwd`";
$varlibvpn= "`pwd`";
# -@@@
sub badusage () { die "usage: udptunnel-reconf [<directory>]\n"; }
$debug=0;
sub fault ($) { die "$0: $_[0]\n"; }
while ($ARGV[0] =~ m/^-/) {
$_= shift @ARGV;
last if m/^--$/;
if (m/^-d$/) { $debug++; next; }
badusage();
}
if (@ARGV) { $etcvpn= shift @ARGV; }
badusage() if @ARGV;
chdir $etcvpn or fault("$etcvpn: $!");
sub run_m4 ($$$) {
my ($wanted, $site, $variable) = @_;
$x= "m4 -P -DWANTED=$wanted -DWHVARIABLE=V_$variable -DV_global=global ".
"-DV_site=$site -DV_varlibvpn=$varlibvpn ".
"-DV_defaults=$shareuserv/udptunnel-vpn-defaults ".
"$shareuserv/udptunnel-vpn-config.m4";
print STDERR $x,"\n" if $debug>=2;
open X, "$x |" or die $!;
undef $/;
$m4out= <X>;
$/= "\n";
$!=0; close X; $? and die "m4 failed with code $? $!";
$m4out =~ s/^\s+//;
$m4out =~ s/\n+/\n/g;
$m4out =~ s/\s+$//;
print STDERR "$wanted/$variable($site) -> \`$m4out'\n" if $debug>=1;
# $m4out='' if $wanted eq 'VARIABLE' && substr($m4out,0,2) eq 'V_';
return $m4out;
}
sub check_junk ($$) {
my ($emsg, $site) = @_;
$j= run_m4('JUNK',$site,'');
$j =~ s/^\# //g;
fault("$emsg: $j") if length $j;
}
sub var_global ($) { return run_m4('VARIABLE','',$_[0]) }
sub var_site ($) { return run_m4('VARIABLE',$site,$_[0]) }
check_junk("error in config",'');
@actives= split /\s+/, run_m4('ACTIVES','','');
@passives= split /\s+/, run_m4('PASSIVES','','');
foreach $site (@actives, @passives) {
check_junk("error in config for site $site",$site);
}
sub parse_addr_mask ($) {
my ($r) = @_;
my ($mask,$iaddr);
if ($r =~ s,/(\d+)$,,) { $mask=$1; } else { $mask=32; }
fault("invalid mask length $1") if $mask<0 || $mask>32;
$mask= $mask ? ~0 << (32-$mask) : 0;
$iaddr= inet_aton($r); fault("invalid address $r") unless defined $iaddr;
$iaddr= (unpack "N",$iaddr)[0];
return ($iaddr, $mask);
}
sub ipif_permit ($$$$) {
my ($group,$local,$net,$why) = @_;
my ($pmask,$piaddr,$fmask,$fiaddr,@lgroup,$lgid);
@lgroup= getgrnam($group);
@lgroup or fault("invalid group \`$group' ($why)");
$lgid= $lgroup[2];
if (!$local) {
($piaddr,$pmask) = parse_addr_mask($net);
foreach $fref (@forbid_remote) {
($fiaddr,$fmask) = @$fref;
$jmask= $fmask & $pmask;
#printf STDERR "%8lx %8lx %l8x %8lx", $pmask,$pmask
fault("local network $net claimed as remote ($why)")
if (($fiaddr&$jmask) == ($piaddr&$jmask));
}
}
$ipif_file .= "$lgid,$local$net, $group, $why\n";
}
$glgroup= var_global('lgroup');
$glend= var_site('lend')."/32";
if ($glend !~ m/^V_/ && $glgroup !~ m/^V_/ &&
length $glend && length $glgroup) {
ipif_permit($glgroup, '=', "$glend", 'local endpoint');
} else {
$glend='X'; $glgroup='X';
}
foreach $site (@actives, @passives) {
$forbid_remote= var_site('forbid_remote');
@forbid_remote= ();
if ($forbid_remote ne '-') {
foreach $r (split /[, \t]+/, $forbid_remote) {
push @forbid_remote, [ parse_addr_mask($r) ];
}
}
$tlend= var_site('lend')."/32";
$tlgroup= var_site('lgroup');
if ($tlend ne $glend || $tlgroup ne $glgroup) {
ipif_permit($tlgroup, '=', $tlend, "$site - local endpoint");
}
$trend= var_site('rend').'/32';
$ix= 0;
$trnets= var_site('rnets');
ipif_permit($tlgroup, '', $trend, "$site - remote endpoint");
if ($trnets ne '-') {
foreach $rnet (split /,/, $trnets) {
ipif_permit($tlgroup, '', $rnet, "$site - remote network #$ix");
$ix++;
}
}
}
sub write_file ($$$$) {
my ($fn,$why,$head,$body) = @_;
length $fn or fault("location to write $why not specified");
open F, ">$fn.new" or fault("create $fn.new: $!");
print F $head."\n# AUTOGENERATED BY $0 - DO NOT EDIT\n".$body or die $!;
close F or die $!;
rename "$fn.new",$fn or die $!;
}
$ipifnetsfile= var_global(ipifnetsfile);
write_file($ipifnetsfile,'ipifnetsfile','', $ipif_file);
$active_file= '';
$knownhosts_file= '';
$inittab= '';
$ix= 0;
foreach $site (@actives) {
$active_file.= "$site\t".var_site('activesxinfo')."\n";
$inittab.= sprintf("t%d", $ix++).':'.var_site('inittab_line')."\n";
$hostkey= var_site('rhostkey');
$knownhosts_file.= var_site('sshdest').' '.$hostkey."\n"
if length $hostkey;
$invoke_file= var_site('invoke_file');
write_file($invoke_file, 'invoke_file',
var_site('invoke_head')."\n", var_site('invoke_body'));
chmod 0777&~umask, $invoke_file or die $!;
}
write_file(var_global('knownhostsfile'),'knownhostsfile', '',$knownhosts_file);
write_file(var_global('activesfile'),'activesfile', '',$active_file);
print
"# You can cut and paste all or part of this into your inittab if you like:\n",
$inittab;
print
"# And consider adding this line, or some of this file's contents,\n".
"# to your /etc/userv/ipif-networks:\n",
"$ipifnetsfile\n"
if $ipifnetsfile =~ m,^/,;
$passive_file= '';
foreach $site (@passives) {
$passive_file.= "$site\t".var_site('passivesxinfo')."\n";
}
write_file(var_global('passivesfile'),'passivesfile', '',$passive_file);
system var_global('postconfigure'); $? and exit -1;
exit 0;
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