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|
#!/usr/bin/perl -w
#
# $Id: dnslookup.cgi,v 2.1 1997/10/22 21:18:56 skh Exp $
#
# This script is a CGI interface to the domain name system. This version
# of the script requires that you have the Net::DNS module from CPAN installed
# and be running perl5.003 or higher.
#
# If you have suggestions or improvements feel free to send 'em to me.
#
# Kent Hamilton
# Work: <KHamilton@Hunter.COM>
# Home: <KentH@HNS.St-Louis.Mo.US>
# URL: http://www2.hunter.com/~skh/
#
$| = 0;
use File::Basename;
use Net::DNS;
####################################
# Set your defaults here folks.
####################################
$DEBUG = 0;
$nameserver = "ns.hunter.com";
$lookuptype = "name_info";
$lookup = "";
$formurl = "/~skh/scripts/dnslookup.html";
$uparrowurl = "/~skh/images/up.gif";
#
# Get our input from the HTML form....
#
read(STDIN, $buffer, $ENV{'CONTENT_LENGTH'});
@pairs = split(/&/, $buffer);
foreach $pair (@pairs) {
# Set this to the characters valid for your input. Try
# not to use anything toooo nasty. (IE `.<>; etc)
$ok_chars = "a-zA-Z0-9_\-\.";
($name, $value) = split(/=/, $pair);
$value =~ tr/+/ /;
$value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C", hex($1))/eg;
$value =~ s/<([^>]|\n)*>//g;
$value =~ s/<//g;
$value =~ s/>//g;
$value =~ s/`;/_/g;
# Strip out everything not an allowed character (translate it to a '_').
$value =~ eval "tr/[$ok_chars]/_/c";
$FORM{$name} = $value;
}
#
# Init our Resolver info.
# If they entered a name server then use it.
#
my $res = new Net::DNS::Resolver;
if ($FORM{'n_server'}) {
my $nameserver = $FORM{'n_server'};
$res->nameservers($nameserver);
}
#
# Some default values.
#
$lookup = $FORM{'lookup_val'};
$lookuptype = $FORM{'choice'};
$type ||= "A";
$class ||= "IN";
#
# They didn't enter anything to search for so yell at 'em.
#
if ( $lookup eq "" ) {
print "Content-type: text/html\n\n";
print "<HTML>\n";
print "<HEAD>\n";
print "<TITLE>DNS Lookup Error!</TITLE>\n";
print "</HEAD>\n";
print "<BODY BGCOLOR=\"#ffffff\">\n";
print "<CENTER><P><BR><BR><BR>\n";
print "You must enter at least a name or IP address to search for.<BR>\n";
print "<P><BR><BR>\n";
print "Return to the <A HREF=\"$formurl\">DNS Lookup</A> form.\n";
print "</BODY></HTML>\n";
exit;
}
#
# Set the type of lookup to do.
# Some of these get reset below but....
#
if ($lookuptype eq 'name_info' ) {
$type = "ANY";
$qstring = 'any information';
} elsif ($lookuptype eq 'ns_lookup') {
$type = "NS";
$qstring = 'name server(s)';
} elsif ($lookuptype eq 'domain_list') {
$type = "AXFR";
$qstring = 'a zone listing';
} elsif ($lookuptype eq 'soa') {
$type = "SOA";
$qstring = 'the start of authority information';
} elsif ($lookuptype eq 'subnet_list') {
$type = "AXFR";
$qstring = 'a subnet listing';
if ( $lookup =~ m/^\d+(\.\d+){0,3}$/ ) {
$reverse = join ('.', reverse (split ('\.', $lookup ))) . '.in-addr.arpa';
$lookup = $reverse;
}
} elsif ($lookuptype eq 'mail_exch') {
$type = "MX";
$qstring = 'the mail exchangers';
} else {
$type = "ANY";
$qstring = 'any information';
}
if ($DEBUG) {
print "Content-type: text/html\n\n";
print "<HTML>\n";
print "<HEAD>\n";
print "<TITLE>DNS Lookup Debug!</TITLE>\n";
print "</HEAD>\n";
print "<BODY BGCOLOR=\"#ffffff\">\n";
print "<CENTER><P><BR><BR><BR>\n";
print "lookup = $lookup<BR>\n";
print "lookuptype = $lookuptype<BR>\n";
print "nameserver = $nameserver<BR>\n";
print "FORM('choice') = $FORM{'choice'}<BR>\n";
print "FORM('n_server') = $FORM{'n_server'}<BR>\n";
print "FORM('lookup_val') = $FORM{'lookup_val'}<BR>\n";
}
#
# Do a zone transfer for either a forward or reverse zone.
#
if ($lookuptype eq "domain_list" || $lookuptype eq "subnet_list" ) {
my @zone = $res->axfr($lookup, $class);
if (defined(@zone) && @zone) {
&html_header;
&html_question($qstring, $lookup, $nameserver);
print "<TABLE>\n";
foreach (@zone) {
$_->print;
print "<BR>\n";
}
&html_footer;
} else {
&html_header;
&html_queryerr("Zone transfer failed: ", $res->errorstring);
&html_footer;
exit;
}
} else {
#
# This is the "anything else" case.
#
my $packet = $res->send($lookup, $type, $class);
if (defined($packet)) {
&html_header;
&html_question( $qstring, $lookup, $nameserver);
if (! $packet->header->aa) {
print "<P><BR><B>Non-authoritative answer</B><BR><BR>\n";
}
$anscount = $packet->header->ancount;
if ( $anscount gt 0 ) {
flush;
@answer = $packet->answer;
print "<TABLE>\n";
print "<TR>\n";
print "<TH>Search String";
print "<TH>Result Type";
print "<TH>Result Data";
print "<TH> </TH>";
print "</TR>\n";
foreach $rr ( @answer ) {
&print_record( $rr );
}
print "</TABLE>";
print "</CENTER>";
} else {
&html_noresponse;
exit;
}
&html_footer;
} else {
&html_header;
&html_queryerr("Query failed: ", $res->errorstring);
&html_footer;
exit;
}
}
exit;
sub html_header {
print "Content-type: text/html\n\n";
print "<HTML>\n<HEAD>\n";
print "<TITLE>Domain Name Server Query Results</TITLE>\n";
print "<LINK REL=STYLESHEET TYPE=\"text/css\" HREF=\"/stylesheets/standard.html\">";
print "</HEAD>\n<BODY BGCOLOR=\"#ffffff\">\n\n";
print "<CENTER>";
print "<H1 CLASS=green>Domain Name Server Query Results</H1>\n";
print "</CENTER>";
print "<P><HR NOSHADE>\n";
print "<FONT FACE=\"Arial\" SIZE=\"2\" COLOR=\"blue\">";
}
sub html_footer {
print "<P>\n<HR NOSHADE>\n<P>\n";
print "<A HREF=\"$formurl\">";
print "<IMG SRC=\"$uparrowurl\"> Return to the DNS Form</A>\n";
print "<P>\n</BODY>\n</HTML>\n";
}
sub html_question {
my $qstring = shift;
my $lookup = shift;
my $nameserver = shift;
print "<BR>\n";
print "The question you asked was:<BR>\n";
printf "Lookup %s for %s at %s.<BR>\n", $qstring, $lookup, $nameserver;
print "<BR><HR NOSHADE><BR>\n";
}
sub html_queryerr {
my $errstr = shift;
my $resstr = shift;
printf "<FONT FACE=\"Arial\" SIZE=\"2\" COLOR=\"blue\">";
printf "<CENTER>\n";
printf "<BR>%s %s<BR>\n", $errstr, $resstr;
printf "<P></CENTER>\n<HR NOSHADE>\n<P>\n";
printf "<A HREF=\"$formurl\">";
printf "<IMG SRC=\"$uparrowurl\"> Return to the DNS Form</A>\n";
printf "<P>\n</BODY>\n</HTML>\n";
exit;
}
sub html_noresponse {
print "<FONT FACE=\"Arial\" SIZE=\"2\" COLOR=\"blue\">";
print "<CENTER>\n";
print "<BR>No results were returned for this query<BR>\n";
print "<P></CENTER>\n<HR NOSHADE>\n<P>\n";
print "<A HREF=\"$formurl\">";
print "<IMG SRC=\"$uparrowurl\"> Return to the DNS Form</A>\n";
print "<P>\n</BODY>\n</HTML>\n";
exit;
}
sub print_record {
my $rr = shift;
if ( $rr->type eq "MX" ) {
print "<TR>\n";
&print_mx($rr);
print "</TR>\n";
} elsif ( $rr->type eq "SOA") {
print "<TR>\n";
&print_soa($rr);
print "</TR>\n";
} elsif ( $rr->type eq "NS") {
print "<TR>\n";
&print_ns($rr);
print "</TR>\n";
} elsif ( $rr->type eq "HINFO") {
print "<TR>\n";
&print_hinfo($rr);
print "</TR>\n";
} else {
print "<TR>\n";
&print_any($rr);
print "</TR>\n";
}
}
sub print_soa {
my $soa = shift;
printf "<TABLE>\n";
printf "<TR>\n";
printf "<TD> </TD>";
printf "<TD>Authoritative Server:</TD>";
printf "<TD>%s</TD>",$soa->mname;
printf "<TR>\n";
printf "<TD> </TD>";
printf "<TD> Responsible Person:</TD>";
printf "<TD>%s</TD>",$soa->rname;
printf "<TR>\n";
printf "<TD> </TD>";
printf "<TD> Zone Serial Number:</TD>\n";
printf "<TD>%s</TD>",$soa->serial;
printf "<TR>\n";
printf "<TD> </TD>";
printf "<TD> Refresh Interval:</TD>\n";
printf "<TD>%s</TD>",$soa->refresh;
printf "<TR>\n";
printf "<TD> </TD>";
printf "<TD> Retry Interval:</TD>\n";
printf "<TD>%s</TD>",$soa->retry;
printf "<TR>\n";
printf "<TD> </TD>";
printf "<TD> Expire Interval:</TD>\n";
printf "<TD>%s</TD>",$soa->expire;
printf "<TR>\n";
printf "<TD> </TD>";
printf "<TD>Minimum Time to Live:</TD>\n";
printf "<TD>%s</TD>",$soa->minimum;
printf "</TR>\n";
}
sub print_mx {
my $mx = shift;
printf "<TR>\n";
printf "<TD>%s</TD>\n", $mx->name;
printf "<TD>%s</TD>\n", $mx->type;
printf "<TD>%s</TD>\n", $mx->preference;
printf "<TD>%s</TD>\n", $mx->exchange;
printf "</TR>\n";
}
sub print_ns {
my $ns = shift;
printf "<TR>\n";
printf "<TD>%s</TD>\n", $ns->name;
printf "<TD>%s</TD>\n", $ns->type;
printf "<TD>%s</TD>\n", $ns->nsdname;
printf "</TR>\n";
}
sub print_hinfo {
my $hinfo = shift;
printf "<TR>\n";
printf "<TD>%s</TD>\n", $hinfo->name;
printf "<TD>%s</TD>\n", $hinfo->type;
printf "<TD>CPU: %s</TD>\n", $hinfo->cpu;
printf "<TD>O/S: %s</TD>\n", $hinfo->os;
printf "</TR>\n";
}
sub print_any {
my $rr = shift;
printf "<TR>\n";
printf "<TD>%s</TD>\n", $rr->name;
printf "<TD>%s</TD>\n", $rr->type;
printf "<TD>%s</TD>\n", $rr->rdatastr;
printf "</TR>\n";
}
|
