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 $forbid_remote= var_global('forbid_remote');
  98 @forbid_remote= ();
  99 foreach $r (split /[, \t]+/, $forbid_remote) {
 100     push @forbid_remote, [ parse_addr_mask($r) ];
 101 }
 102
 103 sub ipif_permit ($$$$) {
 104     my ($group,$local,$net,$why) = @_;
 105     my ($pmask,$piaddr,$fmask,$fiaddr,@lgroup,$lgid);
 106
 107     @lgroup= getgrnam($group);
 108     @lgroup or fault("invalid group \`$group' ($why)");
 109     $lgid= $lgroup[2];
 110
 111     if (!$local) {
 112         ($piaddr,$pmask) = parse_addr_mask($net);
 113         foreach $fref (@forbid_remote) {
 114             ($fiaddr,$fmask) = @$fref;
 115             $jmask= $fmask & $pmask;
 116 #printf STDERR "%8lx %8lx %l8x %8lx", $pmask,$pmask
 117             fault("local network $net claimed as remote ($why)")
 118                 if (($fiaddr&$jmask) == ($piaddr&$jmask));
 119         }
 120     }
 121     $ipif_file .= "$lgid,$local$net,    $group, $why\n";
 122 }
 123
 124 $glgroup= var_global('lgroup');
 125 $glend= var_site('lend')."/32";
 126 if ($glend !~ m/^V_/ && $glgroup !~ m/^V_/ &&
 127     length $glend && length $glgroup) {
 128     ipif_permit($glgroup, '=', "$glend", 'local endpoint');
 129 } else {
 130     $glend='X'; $glgroup='X';
 131 }
 132
 133 foreach $site (@actives, @passives) {
 134     $tlend= var_site('lend')."/32";
 135     $tlgroup= var_site('lgroup');
 136     if ($tlend ne $glend || $tlgroup ne $glgroup) {
 137         ipif_permit($tlgroup, '=', $tlend, "$site - local endpoint");
 138     }
 139     $trend= var_site('rend').'/32';
 140     $ix= 0;
 141     $trnets= var_site('rnets');
 142     ipif_permit($tlgroup, '', $trend, "$site - remote endpoint");
 143     if ($trnets ne '-') {
 144         foreach $rnet (split /,/, $trnets) {
 145             ipif_permit($tlgroup, '', $rnet, "$site - remote network #$ix");
 146                 $ix++;
 147         }
 148     }
 149 }
 150
 151 sub write_file ($$$$) {
 152     my ($fn,$why,$head,$body) = @_;
 153     length $fn or fault("location to write $why not specified");
 154     open F, ">$fn.new" or fault("create $fn.new: $!");
 155     print F $head."\n# AUTOGENERATED BY $0 - DO NOT EDIT\n".$body or die $!;
 156     close F or die $!;
 157     rename "$fn.new",$fn or die $!;
 158 }
 159
 160 $ipifnetsfile= var_global(ipifnetsfile);
 161 write_file($ipifnetsfile,'ipifnetsfile','', $ipif_file);
 162
 163 $active_file= '';
 164 $inittab= '';
 165 $ix= 0;
 166 foreach $site (@actives) {
 167     $active_file.= "$site\t".var_site('activesxinfo')."\n";
 168     $inittab.= sprintf("t%d", $ix++).':'.var_site('inittab_line')."\n";
 169     $invoke_file= var_site('invoke_file');
 170     write_file($invoke_file, 'invoke_file',
 171                var_site('invoke_head'), var_site('invoke_body'));
 172     chmod 0777&~umask, $invoke_file or die $!;
 173 }
 174 write_file(var_global('activesfile'),'activesfile', '',$active_file);
 175
 176 print
 177 "# You can cut and paste all or part of this into your inittab if you like:\n",
 178     $inittab;
 179
 180 print
 181 "# And consider adding this line, or some of this file's contents,\n".
 182 "# to your /etc/userv/ipif-networks:\n",
 183     "$ipifnetsfile\n"
 184     if $ipifnetsfile =~ m,^/,;
 185
 186 $passive_file= '';
 187 foreach $site (@passives) {
 188     $passive_file.= "$site\t".var_site('passivesxinfo')."\n";
 189 }
 190 write_file(var_global('passivesfile'),'passivesfile', '',$passive_file);
 191
 192 system var_global('postconfigure'); $? and exit -1;
 193
 194 exit 0;