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|
#!/usr/bin/perl
use Getopt::Std;
$delim_start = " -- added by totd DON'T MODIFY THIS LINE --";
$delim_end = " -- end --";
#$etcdir = "/home/omote/lab/totd";
$etcdir = "/etc";
$dhcp_script = "$etcdir/dhclient-enter-hooks";
$resolv_conf = "$etcdir/resolv.conf";
$totd_conf = "$etcdir/totd.conf";
$resolvconf = "/sbin/resolvconf";
$USERID = $<;
$hook_script=<<'__EOF__';
make_resolv_conf() {
if [ "$new_domain_name_servers" != "$old_domain_name_servers" ]; then
totdconfig -a -d "$new_domain_name_servers"
fi
/etc/init.d/totd restart
}
__EOF__
sub removedelim(@) {
my($HEAD, $FOOT, $MODE, @TEXT, $i);
@TEXT = @_;
$HEAD = ""; $FOOT = ""; $MODE = 0;
foreach(@TEXT) {
$i = substr($_, 1);
chomp($i);
$MODE = 1 if ($MODE == 0 && ($i eq $delim_start));
$HEAD .= $_ if ($MODE == 0);
$FOOT .= $_ if ($MODE == 2);
$MODE = 2 if ($MODE == 1 && ($a eq $delim_end));
}
return ($HEAD, $FOOT);
}
sub usage {
$usage=<<"__EOF__";
Usage: $0 [-a [-d DNS Servers] [-D] -l] [-r all|dhcp|resolv|totd] [-h]
-a: Add totd specific configration.
-d: Add/change totd DNS server to forward its query.
-D: Configure /etc/dhclient-enter-hooks.
-h: Show this help.
-l: Configure /etc/resolv.conf
-r: Remove totd specific configuration.
(all: all configuration, dhcp: /etc/dhclient-enter-hooks,
resolv: /etc/resolv.conf, totd: /etc/totd.conf)
__EOF__
print STDERR $usage;
exit(0);
}
sub add_conf_file($$$) {
my($FILENAME);
my($DELIM1, $DELIM2, $HEAD, $FOOT, $ADDCONF, $OUT, @FILE);
$FILENAME = $_[0];
$DELIM1 = "$_[1]$delim_start";
$DELIM2 = "$_[1]$delim_end";
$ADDCONF = $_[2];
open(FH, "+<$FILENAME") || die "Cannot read \"$FILENAME\".\n";
flock(FH, 2) || die "Cannot lock \"$FILENAME\".\n";
@FILE=<FH>;
($HEAD, $FOOT) = removedelim(@FILE);
$OUT = "$HEAD$DELIM1\n$ADDCONF$DELIM2\n$FOOT";
seek(FH, 0, 0);
print FH $OUT;
truncate(FH, length($OUT));
close(FH) || die "Cannot close \"$FILENAME\".\n";
}
sub remove_conf_file($) {
my($FILENAME);
my($OUT, $HEAD, $FOOT, @FILE, $FULLTEXT);
$FILENAME = $_[0];
open(FH, "+<$FILENAME") || die "Cannot read \"$FILENAME\".\n";
flock(FH, 2) || die "Cannot lock \"$FILENAME\".\n";
@FILE=<FH>;
$FULLTEXT = join("", @FILE);
if((index($FULLTEXT, $delim_start) == -1) ||
(index($FULLTEXT, $delim_end) == -1)) { # no delimitor found
close(FH);
return;
}
($HEAD, $FOOT) = removedelim(@FILE);
$OUT = $HEAD . $FOOT;
seek(FH, 0, 0);
print FH $OUT;
truncate(FH, length($OUT));
close(FH) || die "Cannot close \"$FILENAME\".\n";
if (length($OUT) == 0) {
unlink("$FILENAME");
}
}
if(-f $resolvconf) {
print "$0: Use resolvconf instead. Nothing to be done.\n";
exit(1);
}
getopts("d:r:ahD");
if("$USERID" ne "0") {print STDERR "$0: permission denied.\n";exit(1);}
if(length($opt_r)) {
remove_conf_file($dhcp_script) if($opt_r =~ /^dhcp$/ || $opt_r =~ /^all$/);
# remove_conf_file($resolv_conf) if($opt_r =~ /^resolv$/ || $opt_r =~ /^all$/);
remove_conf_file($totd_conf) if($opt_r =~ /^totd$/ || $opt_r =~ /^all$/);
exit(0);
}
if($opt_a) {
$done = 0;
if(length($opt_d)) {
$dns = "retry 5\n";
$dns .= "pidfile /var/run/totd/totd.pid\n";
@dns_list = split(" ", $opt_d);
foreach(@dns_list) {
$dns .= "forwarder $_\n";
}
add_conf_file($totd_conf, ";", $dns);
$done = 1;
}
if($opt_D) {
add_conf_file($dhcp_script, "#", $hook_script);
$done = 1;
}
if($done != 0) {exit(0);}
}
usage();
|
