mdw@git.distorted.org.uk Git - userv-utils/blob - ipif/udptunnel-reconf.pl

   1 #!/usr/bin/perl
   2 # udptunnel-reconf
   3 # Set up the relevant stuff in /etc/userv/vpn, and then run
   4 # this.  It should tell you what to do to inittab and ipif-networks.
   5
   6 # This is free software; you can redistribute it and/or modify it
   7 # under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation; either version 2 of the License, or
   9 # (at your option) any later version.
  10 #
  11 # This program is distributed in the hope that it will be useful, but
  12 # WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 # General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License
  17 # along with userv-utils; if not, write to the Free Software
  18 # Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19 #
  20 # $Id$
  21
  22 use Socket;
  23
  24 # @@@-
  25 $shareuserv= "`pwd`";
  26 $etcvpn= "`pwd`";
  27 $varlibvpn= "`pwd`";
  28 # -@@@
  29
  30 sub badusage () { die "usage: udptunnel-reconf [<directory>]\n"; }
  31 $debug=0;
  32
  33 sub fault ($) { die "$0: $_[0]\n"; }
  34
  35 while ($ARGV[0] =~ m/^-/) {
  36     $_= shift @ARGV;
  37     last if m/^--$/;
  38     if (m/^-d$/) { $debug++; next; }
  39     badusage();
  40 }
  41
  42 if (@ARGV) { $etcvpn= shift @ARGV; }
  43 badusage() if @ARGV;
  44
  45 chdir $etcvpn or fault("$etcvpn: $!");
  46
  47 sub run_m4 ($$$) {
  48     my ($wanted, $site, $variable) = @_;
  49     $x= "m4 -P -DWANTED=$wanted -DWHVARIABLE=V_$variable -DV_global=global ".
  50         "-DV_site=$site -DV_varlibvpn=$varlibvpn ".
  51         "-DV_defaults=$shareuserv/udptunnel-vpn-defaults ".
  52         "$shareuserv/udptunnel-vpn-config.m4";
  53     print STDERR $x,"\n" if $debug>=2;
  54     open X, "$x |" or die $!;
  55     undef $/;
  56     $m4out= <X>;
  57     $/= "\n";
  58     close X; $? and exit -1;
  59     $m4out =~ s/^\s+//;
  60     $m4out =~ s/\n+/\n/g;
  61     $m4out =~ s/\s+$//;
  62     print STDERR "$wanted/$variable($site) -> \`$m4out'\n" if $debug>=1;
  63 #    $m4out='' if $wanted eq 'VARIABLE' && substr($m4out,0,2) eq 'V_';
  64     return $m4out;
  65 }
  66
  67 sub check_junk ($$) {
  68     my ($emsg, $site) = @_;
  69     $j= run_m4('JUNK',$site,'');
  70     $j =~ s/^\# //g;
  71     fault("$emsg: $j") if length $j;
  72 }
  73
  74 sub var_global ($) { return run_m4('VARIABLE','',$_[0]) }
  75 sub var_site ($) { return run_m4('VARIABLE',$site,$_[0]) }
  76
  77 check_junk("error in config",'');
  78
  79 @actives= split /\s+/, run_m4('ACTIVES','','');
  80 @passives= split /\s+/, run_m4('PASSIVES','','');
  81
  82 foreach $site (@actives, @passives) {
  83     check_junk("error in config for site $site",$site);
  84 }
  85
  86 sub parse_addr_mask ($) {
  87     my ($r) = @_;
  88     my ($mask,$iaddr);
  89     if ($r =~ s,/(\d+)$,,) { $mask=$1; } else { $mask=32; }
  90     fault("invalid mask length $1") if $mask<0 || $mask>32;
  91     $mask= $mask ? ~0 << (32-$mask) : 0;
  92     $iaddr= inet_aton($r); fault("invalid address $r") unless defined $iaddr;
  93     $iaddr= (unpack "N",$iaddr)[0];
  94     return ($iaddr, $mask);
  95 }
  96
  97 sub ipif_permit ($$$$) {
  98     my ($group,$local,$net,$why) = @_;
  99     my ($pmask,$piaddr,$fmask,$fiaddr,@lgroup,$lgid);
 100
 101     @lgroup= getgrnam($group);
 102     @lgroup or fault("invalid group \`$group' ($why)");
 103     $lgid= $lgroup[2];
 104
 105     if (!$local) {
 106         ($piaddr,$pmask) = parse_addr_mask($net);
 107         foreach $fref (@forbid_remote) {
 108             ($fiaddr,$fmask) = @$fref;
 109             $jmask= $fmask & $pmask;
 110 #printf STDERR "%8lx %8lx %l8x %8lx", $pmask,$pmask
 111             fault("local network $net claimed as remote ($why)")
 112                 if (($fiaddr&$jmask) == ($piaddr&$jmask));
 113         }
 114     }
 115     $ipif_file .= "$lgid,$local$net,    $group, $why\n";
 116 }
 117
 118 $glgroup= var_global('lgroup');
 119 $glend= var_site('lend')."/32";
 120 if ($glend !~ m/^V_/ && $glgroup !~ m/^V_/ &&
 121     length $glend && length $glgroup) {
 122     ipif_permit($glgroup, '=', "$glend", 'local endpoint');
 123 } else {
 124     $glend='X'; $glgroup='X';
 125 }
 126
 127 foreach $site (@actives, @passives) {
 128     $forbid_remote= var_site('forbid_remote');
 129     @forbid_remote= ();
 130     if ($forbid_remote ne '-') {
 131         foreach $r (split /[, \t]+/, $forbid_remote) {
 132             push @forbid_remote, [ parse_addr_mask($r) ];
 133         }
 134     }
 135
 136     $tlend= var_site('lend')."/32";
 137     $tlgroup= var_site('lgroup');
 138     if ($tlend ne $glend || $tlgroup ne $glgroup) {
 139         ipif_permit($tlgroup, '=', $tlend, "$site - local endpoint");
 140     }
 141     $trend= var_site('rend').'/32';
 142     $ix= 0;
 143     $trnets= var_site('rnets');
 144     ipif_permit($tlgroup, '', $trend, "$site - remote endpoint");
 145     if ($trnets ne '-') {
 146         foreach $rnet (split /,/, $trnets) {
 147             ipif_permit($tlgroup, '', $rnet, "$site - remote network #$ix");
 148                 $ix++;
 149         }
 150     }
 151 }
 152
 153 sub write_file ($$$$) {
 154     my ($fn,$why,$head,$body) = @_;
 155     length $fn or fault("location to write $why not specified");
 156     open F, ">$fn.new" or fault("create $fn.new: $!");
 157     print F $head."\n# AUTOGENERATED BY $0 - DO NOT EDIT\n".$body or die $!;
 158     close F or die $!;
 159     rename "$fn.new",$fn or die $!;
 160 }
 161
 162 $ipifnetsfile= var_global(ipifnetsfile);
 163 write_file($ipifnetsfile,'ipifnetsfile','', $ipif_file);
 164
 165 $active_file= '';
 166 $knownhosts_file= '';
 167 $inittab= '';
 168 $ix= 0;
 169 foreach $site (@actives) {
 170     $active_file.= "$site\t".var_site('activesxinfo')."\n";
 171     $inittab.= sprintf("t%d", $ix++).':'.var_site('inittab_line')."\n";
 172     $hostkey= var_site('rhostkey');
 173     $knownhosts_file.= var_site('sshdest').' '.$hostkey."\n"
 174         if length $hostkey;
 175     $invoke_file= var_site('invoke_file');
 176     write_file($invoke_file, 'invoke_file',
 177                var_site('invoke_head')."\n", var_site('invoke_body'));
 178     chmod 0777&~umask, $invoke_file or die $!;
 179 }
 180 write_file(var_global('knownhostsfile'),'knownhostsfile', '',$knownhosts_file);
 181 write_file(var_global('activesfile'),'activesfile', '',$active_file);
 182
 183 print
 184 "# You can cut and paste all or part of this into your inittab if you like:\n",
 185     $inittab;
 186
 187 print
 188 "# And consider adding this line, or some of this file's contents,\n".
 189 "# to your /etc/userv/ipif-networks:\n",
 190     "$ipifnetsfile\n"
 191     if $ipifnetsfile =~ m,^/,;
 192
 193 $passive_file= '';
 194 foreach $site (@passives) {
 195     $passive_file.= "$site\t".var_site('passivesxinfo')."\n";
 196 }
 197 write_file(var_global('passivesfile'),'passivesfile', '',$passive_file);
 198
 199 system var_global('postconfigure'); $? and exit -1;
 200
 201 exit 0;