| 1 | # DNSBL
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| 2 | # Functions for interacting with the DNSBL database
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| 3 |
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| 4 | package DNSBL;
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| 5 |
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| 6 | use strict;
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| 7 | use warnings;
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| 8 | use Exporter;
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| 9 | use DBI;
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| 10 | use NetAddr::IP;
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| 11 |
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| 12 | use vars qw($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS);
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| 13 |
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| 14 | $VERSION = 2.0;
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| 15 | @ISA = qw(Exporter);
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| 16 | @EXPORT_OK = qw(
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| 17 | );
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| 18 |
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| 19 | @EXPORT = (); # Export nothing by default.
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| 20 | %EXPORT_TAGS = ( ALL => [qw(
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| 21 | )]
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| 22 | );
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| 23 |
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| 24 | ## "constants"
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| 25 |
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| 26 | # 8 bits available
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| 27 | # 128 is per-IP shitlist
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| 28 | # 2 is IP hitlist
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| 29 | # 1 not available so we don't $self->shoot(foot)
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| 30 | our %bitfields = (
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| 31 | # block levels
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| 32 | 0 => 16,
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| 33 | 1 => 8,
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| 34 | 2 => 4,
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| 35 | # ip
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| 36 | ip => 2,
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| 37 | # OOB
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| 38 | org => 32,
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| 39 | block => 64,
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| 40 | # "I'm a total spamming moron!" - per-IP only!
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| 41 | slist => 128
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| 42 | );
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| 43 |
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| 44 | # probably needs some tuning; even 7 hits in a /24 is a pretty small percentage
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| 45 | # number of IPs in a block of the given masklength needed to have that block automatically listed
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| 46 | # defaults: (overridden by entries in db:autolist)
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| 47 | our %autolist = (
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| 48 | 31 => 1,
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| 49 | 30 => 1,
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| 50 | 29 => 2,
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| 51 | 28 => 3,
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| 52 | 27 => 4,
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| 53 | 26 => 5,
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| 54 | 25 => 6,
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| 55 | 24 => 7,
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| 56 | 23 => 8,
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| 57 | 22 => 10,
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| 58 | 21 => 13,
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| 59 | 20 => 16,
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| 60 | 19 => 19,
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| 61 | 18 => 22,
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| 62 | 17 => 26,
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| 63 | 16 => 30,
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| 64 | 15 => 34,
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| 65 | 14 => 38,
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| 66 | 13 => 42,
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| 67 | 12 => 46,
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| 68 | 11 => 50,
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| 69 | 10 => 54,
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| 70 | 9 => 58,
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| 71 | 8 => 62,
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| 72 | 7 => 2**31,
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| 73 | 6 => 2**31,
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| 74 | 5 => 2**31,
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| 75 | 4 => 2**31,
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| 76 | 3 => 2**31,
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| 77 | 2 => 2**31,
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| 78 | 1 => 2**31,
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| 79 | 0 => 2**31
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| 80 | );
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| 81 |
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| 82 | # le sigh. constants for masklength iterationing
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| 83 | our @howmany = (1,128,64,32,16,8,4,2,1,128,64,32,16,8,4,2,1,128,64,32,16,8,4,2,1,128,64,32,16,8,4,2);
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| 84 |
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| 85 | # variables
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| 86 | our $dbh;
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| 87 |
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| 88 | our $err;
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| 89 | our $errstr;
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| 90 |
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| 91 | # basic object subs
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| 92 | sub new {
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| 93 | # iff we want to start taking arguments, or doing other things on instantiation
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| 94 | # my $self = {};
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| 95 | # bless $self, "DNSBL";
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| 96 | # return $self;
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| 97 | bless {};
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| 98 | }
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| 99 |
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| 100 | sub DESTROY {
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| 101 | my $self = shift;
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| 102 | $self->dbclose();
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| 103 | }
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| 104 |
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| 105 | # JIC someone wants to close the db but not finish the script
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| 106 | sub dbclose {
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| 107 | $dbh->rollback;
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| 108 | $dbh->disconnect;
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| 109 | }
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| 110 |
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| 111 | ## specific object subs:
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| 112 |
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| 113 | sub connect {
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| 114 | my $DSN = "DBI:Pg:host=dbhost;dbname=dnsbl";
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| 115 | # my $DSN = "DBI:Pg:dbname=dnsbl";
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| 116 | my $user = "dnsbl";
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| 117 | my $pass = "spambgone";
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| 118 | ## want to NOT autocommit everything, it's unlikely we'll step on our own toes but...
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| 119 | $dbh = DBI->connect($DSN, $user, $pass, {
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| 120 | AutoCommit => 0,
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| 121 | PrintError => 1
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| 122 | })
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| 123 | or die "database inaccessible: ".$DBI::errstr;
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| 124 | my $sth = $dbh->prepare("SELECT masklen,ipcount FROM autolist");
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| 125 | $sth->execute;
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| 126 | while (my ($masklen,$ipcount) = $sth->fetchrow_array) {
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| 127 | $autolist{$masklen} = $ipcount;
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| 128 | }
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| 129 | return $dbh;
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| 130 | }
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| 131 |
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| 132 |
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| 133 | ## DNSBLDB::initexport()
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| 134 | # Prepare a couple of statement handles for later processing in export(). Assists in ~3x speed increase.
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| 135 | my $parsth;
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| 136 | my $sthmoron;
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| 137 | sub initexport {
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| 138 | $parsth = $dbh->prepare("SELECT count(i.ip),b.block,b.level,b.listme AS oobblock,o.listme AS ooborg ".
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| 139 | "FROM iplist i INNER JOIN blocks b ON i.ip << b.block INNER JOIN orgs o ON b.orgid = o.orgid ".
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| 140 | "WHERE b.block >>= ? ".
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| 141 | "GROUP BY b.block,b.level,b.listme,o.listme ORDER BY b.block");
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| 142 | $sthmoron = $dbh->prepare("SELECT ip,s4list FROM iplist WHERE ip << ? ORDER BY ip");
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| 143 | }
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| 144 |
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| 145 |
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| 146 | ## DNSBL::ipexists()
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| 147 | # return report count if the IP has been reported, otherwise return undef
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| 148 | sub ipexists {
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| 149 | my $self = shift;
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| 150 | my $ip = shift;
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| 151 | my $sth = $dbh->prepare("SELECT count FROM iplist WHERE ip=?");
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| 152 | $sth->execute($ip);
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| 153 | my ($ret) = $sth->fetchrow_array();
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| 154 | return $ret;
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| 155 | } # end ipexists()
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| 156 |
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| 157 |
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| 158 | # report an IP or URI to the db
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| 159 | # increments a hit counter iff the reported IP or URI exists, otherwise it adds it
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| 160 | sub report {
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| 161 | my $self = shift;
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| 162 | my $rep = shift;
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| 163 | my $sth;
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| 164 | my $rows = 0;
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| 165 | if ($rep =~ /^[\d.]+$/) {
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| 166 | # weesa gonna ASS-U-ME IP addresses are sanely formatted.
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| 167 | $sth = $dbh->prepare("SELECT count FROM iplist WHERE ip=?");
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| 168 | $sth->execute($rep) or die "eep? ".$dbh->errstr."\n";
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| 169 | $rows = $sth->rows;
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| 170 | if ($rows == 0) {
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| 171 | $sth = $dbh->prepare("INSERT INTO iplist (ip) VALUES (?)");
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| 172 | } elsif ($rows == 1) {
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| 173 | $sth = $dbh->prepare("UPDATE iplist SET count=count+1 WHERE ip=?");
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| 174 | } else {
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| 175 | die "db corrupt: found $rows matches on $rep\n";
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| 176 | }
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| 177 | $sth->execute($rep) or die "couldn't update listing for $rep: ".$dbh->errstr."\n";
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| 178 | } else {
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| 179 | return;
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| 180 | }
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| 181 | $dbh->commit;
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| 182 | return $rows;
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| 183 | } # end report()
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| 184 |
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| 185 |
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| 186 | # add a new org
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| 187 | # return the orgid
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| 188 | # if the org exists, return the orgid anyway
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| 189 | sub addorg {
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| 190 | my $self = shift;
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| 191 | my $orgname = shift;
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| 192 | my $listme = shift || 'n';
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| 193 | my $ret = $self->orgexists($orgname);
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| 194 | return $ret if $ret;
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| 195 | my $sth = $dbh->prepare("INSERT INTO orgs (orgname,listme) VALUES (?,?)");
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| 196 | $sth->execute($orgname,$listme) or die "couldn't add org $orgname: ".$dbh->errstr."\n";
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| 197 | $dbh->commit;
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| 198 | $sth = $dbh->prepare("SELECT orgid FROM orgs WHERE orgname=?");
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| 199 | $sth->execute($orgname);
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| 200 | my ($orgid) = $sth->fetchrow_array();
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| 201 | return $orgid;
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| 202 | } # end addorg
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| 203 |
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| 204 |
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| 205 | # checks for existence - nb, exact match! No way to really handle anything else. :/
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| 206 | sub orgexists {
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| 207 | my $self = shift;
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| 208 | my $org = shift;
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| 209 | my $sth = $dbh->prepare("SELECT orgid FROM orgs WHERE orgname=?");
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| 210 | $sth->execute($org);
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| 211 | my ($ret) = $sth->fetchrow_array();
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| 212 | return $ret;
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| 213 | } # end orgexists();
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| 214 |
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| 215 |
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| 216 | # add a block. requires the orgid
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| 217 | ##fixme needs error handling
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| 218 | sub addblock {
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| 219 | my $self = shift;
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| 220 | my $blockin = shift;
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| 221 | my $orgid = shift;
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| 222 | my $level = shift;
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| 223 | $blockin =~ s/^\s+//;
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| 224 | $blockin =~ s/\s+$//;
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| 225 | my $block = new NetAddr::IP "$blockin"; # need this to clean up messes like ranges. sigh.
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| 226 |
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| 227 | return "$blockin not a single CIDR range" if !$block;
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| 228 |
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| 229 | local $dbh->{AutoCommit} = 1; # force autocommit
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| 230 |
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| 231 | my $sth = $dbh->prepare("INSERT INTO blocks (block,orgid,level) VALUES (?,?,?)");
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| 232 | $sth->execute("$block",$orgid,$level);
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| 233 | return $sth->errstr if $sth->err;
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| 234 | # nb: no need to return anything, since the CIDR block is the key
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| 235 | }
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| 236 |
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| 237 |
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| 238 | sub blockexists {
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| 239 | my $self = shift;
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| 240 | my $block = shift;
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| 241 | my $sth = $dbh->prepare("SELECT count(*) FROM blocks WHERE block=?");
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| 242 | $sth->execute($block);
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| 243 | my ($ret) = $sth->fetchrow_array();
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| 244 | return $ret;
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| 245 | }
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| 246 |
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| 247 |
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| 248 | # returns list (block,orgname) for the block that contains the passed IP.
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| 249 | # accepts a level argument if you don't want the top-level registrar allocation block
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| 250 | sub getcontainer {
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| 251 | my $self = shift;
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| 252 | my $ip = shift;
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| 253 | my $level = shift || 0;
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| 254 | my $sth = $dbh->prepare("SELECT b.block,o.orgname FROM blocks b INNER JOIN orgs o ".
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| 255 | "ON b.orgid=o.orgid WHERE b.block >> ? AND b.level = ?");
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| 256 | $sth->execute($ip,$level);
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| 257 | return $sth->fetchrow_array();
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| 258 | } # end getcontainer()
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| 259 |
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| 260 |
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| 261 | # whee! Recursion is Fun!
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| 262 | # Call ourself to dig down through the layers of blocks from registar-allocation
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| 263 | # (level 0) to final block (level n, not to exceed 2)
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| 264 | # Take a reference to a hash, and stuff it full of blacklisting goodness.
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| 265 | # Optionally accept a level, block-container, and OOB block and org arguments for
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| 266 | # the container to check and return
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| 267 | # Returns no value directly
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| 268 | # Calls itself to walk down the tree of containers
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| 269 | sub export {
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| 270 | my $self = shift;
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| 271 | my $listhosts = shift;
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| 272 |
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| 273 | # Export data as CIDR netblocks or classful (A/B/C) blocks
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| 274 | # Assume classful as it's more compatible with different DNS servers
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| 275 | my $mode = shift || 'class';
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| 276 |
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| 277 | # Assume we're checking the whole enchilada if we don't get told where to look.
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| 278 | my $level = shift || 0;
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| 279 | my $container = shift || '0.0.0.0/0';
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| 280 | my $bitmask = shift || 0;
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| 281 |
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| 282 | if ($level > 3) {
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| 283 | warn "getting too deep, breaking off! ($container, $level)\n";
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| 284 | return;
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| 285 | }
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| 286 |
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| 287 | # fiddle $container into a sane state.
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| 288 | if ($container =~ m|^\d+\.\d+\.\d+/\d+$|) {
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| 289 | $container =~ s|/(\d+)$|.0/$1|;
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| 290 | } elsif ($container =~ m|^\d+\.\d+/\d+$|) {
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| 291 | $container =~ s|/(\d+)$|.0.0/$1|;
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| 292 | } elsif ($container =~ m|^\d+/(\d+)$|) {
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| 293 | $container =~ s|/(\d+)$|.0.0.0/$1|;
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| 294 | }
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| 295 |
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| 296 | my $sth = $dbh->prepare("SELECT count(*) FROM blocks WHERE block << ?");
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| 297 | $sth->execute($container);
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| 298 | my ($nblocks) = $sth->fetchrow_array();
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| 299 |
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| 300 | # need this for a bunch of things, may as well do it here
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| 301 | my ($masklen) = ($container =~ m|/(\d+)$|);
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| 302 |
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| 303 | # Update the bitmask variable with the current block info as needed.
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| 304 | # Much faster than retrieving this data later (~3x faster!).
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| 305 | my $listme;
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| 306 | my $listorg;
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| 307 | my $bcount;
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| 308 | if ($container ne '0.0.0.0/0') {
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| 309 | $sth = $dbh->prepare("SELECT count(*) FROM iplist WHERE ip << ?");
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| 310 | $sth->execute($container);
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| 311 | ($bcount) = $sth->fetchrow_array();
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| 312 |
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| 313 | $sth = $dbh->prepare("SELECT b.listme,o.listme ".
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| 314 | "FROM blocks b INNER JOIN orgs o ON b.orgid=o.orgid ".
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| 315 | "WHERE b.block = ?");
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| 316 | $sth->execute($container);
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| 317 | ($listme,$listorg) = $sth->fetchrow_array();
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| 318 |
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| 319 | $bitmask |= $bitfields{$level-1} if $bcount >= $autolist{$masklen};
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| 320 | $bitmask |= $bitfields{block} if $listme;
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| 321 | $bitmask |= $bitfields{org} if $listorg;
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| 322 | }
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| 323 |
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| 324 | # hm. can't seem to move this prepare elsewhere. :(
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| 325 | if ($nblocks > 0) {
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| 326 | my $sthsubblocks = $dbh->prepare("SELECT block FROM blocks ".
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| 327 | "WHERE level=? and block << ? ORDER BY block, masklen(block) DESC");
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| 328 | $sthsubblocks->execute($level, $container);
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| 329 | while (my ($cidr) = $sthsubblocks->fetchrow_array()) {
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| 330 | $self->export($listhosts,$mode,$level+1,$cidr,$bitmask);
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| 331 | }
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| 332 | } # avoid checking content of subs if we don't have any
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| 333 |
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| 334 | # don't check all 4.2 billion IPs individually if we're looking at all teh Intarwebs
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| 335 | return if $container eq '0.0.0.0/0';
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| 336 |
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| 337 | ##fixme: need a way to dig out orphan IPs at all levels - IPs not found in a
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| 338 | # subblock of the current container when the current container *has* subblocks
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| 339 | # NB: this may be better handled as an out-of-band data-integrity-checker
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| 340 |
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| 341 | # decrement level here so the right bitfield setting gets picked. this segment
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| 342 | # is inherently off-by-one from the block-recursion loop, and I can't see a
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| 343 | # better way to work around that. >:(
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| 344 | $level--;
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| 345 |
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| 346 | if ($mode eq 'cidr') {
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| 347 | $listhosts->{$container} |= $bitmask if $bitmask && ($listme || $listorg || ($bcount >= $autolist{$masklen}));
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| 348 | } else {
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| 349 | # if $cidr->masklen is <= 24, iterate on /24 boundaries for bulk sublisting
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| 350 | # if $cidr->masklen is <= 16, iterate on /16 boundaries for bulk sublisting
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| 351 | # if $cidr->masklen is <= 8, iterate on /8 boundaries for bulk sublisting
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| 352 |
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| 353 | if ($bitmask) {
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| 354 | my @blocksubs;
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| 355 | if ($masklen <= 30 && $masklen > 24) {
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| 356 | my ($net,$octet) = ($container =~ m|^(\d+\.\d+\.\d+\.)(\d+)/|);
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| 357 | for (my $entry = $octet; $entry < ($octet + $howmany[$masklen]); $entry++) {
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| 358 | my $host = "$net$entry";
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| 359 | $listhosts->{$host} = 0 if !defined($listhosts->{$host});
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| 360 | $listhosts->{$host} |= $bitmask;
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| 361 | }
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| 362 | } elsif ($masklen <= 24 && $masklen > 16) {
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| 363 | my ($net,$octet) = ($container =~ m|^(\d+\.\d+\.)(\d+)\.\d+/|);
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| 364 | for (my $entry = $octet; $entry < ($octet + $howmany[$masklen]); $entry++) {
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| 365 | my $twofour = "$net$entry.*";
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| 366 | $listhosts->{$twofour} |= $bitmask;
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| 367 | }
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| 368 | } elsif ($masklen <= 16 && $masklen > 8) {
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| 369 | my ($net,$octet) = ($container =~ m|^(\d+\.)(\d+)\.\d+\.\d+/|);
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| 370 | for (my $entry = $octet; $entry < ($octet + $howmany[$masklen]); $entry++) {
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| 371 | my $sixteen = "$net$entry.*";
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| 372 | $listhosts->{$sixteen} |= $bitmask;
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| 373 | }
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| 374 | } elsif ($masklen <= 8) {
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| 375 | my ($octet) = ($container =~ m|^(\d+)\.\d+\.\d+\.\d+/|);
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| 376 | for (my $entry = $octet; $entry < ($octet + $howmany[$masklen]); $entry++) {
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| 377 | my $eight = "$entry.*";
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| 378 | $listhosts->{$eight} |= $bitmask;
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| 379 | }
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| 380 | }
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| 381 |
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| 382 | } # generate autolist entries for ips/octets not (yet) seen in reports
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| 383 |
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| 384 | } # cidr vs classful mode
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| 385 |
|
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| 386 | $sthmoron->execute($container);
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| 387 | while (my ($ip,$moron) = $sthmoron->fetchrow_array()) {
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| 388 | $listhosts->{$ip} |= $bitmask;
|
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| 389 | if ($moron) {
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| 390 | $listhosts->{$ip} = $bitfields{slist};
|
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| 391 | } else {
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| 392 | $listhosts->{$ip} |= $bitfields{ip};
|
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| 393 | }
|
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| 394 | }
|
|---|
| 395 |
|
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| 396 | # get IPs which for reasons unknown are apparently allocated directly from the
|
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| 397 | # parent registry (and so do not have containing netblocks in this system) O_o
|
|---|
| 398 | # select * from iplist where not (select count(*) from blocks where ip << block) > 0;
|
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| 399 |
|
|---|
| 400 | return;
|
|---|
| 401 | } # end export()
|
|---|
| 402 |
|
|---|
| 403 |
|
|---|
| 404 | sub export_alt {
|
|---|
| 405 | my $self = shift;
|
|---|
| 406 | my $listhosts = shift;
|
|---|
| 407 | my $level = shift || 0;
|
|---|
| 408 | my $container = shift || '0.0.0.0/0';
|
|---|
| 409 | my $oobblock = shift || 0;
|
|---|
| 410 | my $ooborg = shift || 0;
|
|---|
| 411 |
|
|---|
| 412 | #print "\nDEBUG: called with $level, $container, $oobblock, $ooborg\n";
|
|---|
| 413 | # if $level > 2 or $container =~ /^64\.76\./;
|
|---|
| 414 | # my %listhosts;
|
|---|
| 415 |
|
|---|
| 416 | # $level = 0 if !$level;
|
|---|
| 417 | if ($level > 3) {
|
|---|
| 418 | warn "getting too deep, breaking off!\n";
|
|---|
| 419 | return;
|
|---|
| 420 | }
|
|---|
| 421 |
|
|---|
| 422 | my $sth = $dbh->prepare("select ip,s4list from iplist order by ip");
|
|---|
| 423 | my $bsth = $dbh->prepare("select b.block,b.listme,b.level,o.listme ".
|
|---|
| 424 | "from blocks b inner join orgs o on b.orgid=o.orgid ".
|
|---|
| 425 | "where b.block >> ?");
|
|---|
| 426 | while (my ($ip,$s4list) = $sth->fetchrow_array) {
|
|---|
| 427 | $bsth->execute($ip);
|
|---|
| 428 | while (my ($block,$blisted,$blevel,$olisted) = $bsth->fetchrow_array) {
|
|---|
| 429 | $listhosts->{$ip} |= 0;
|
|---|
| 430 | }
|
|---|
| 431 | }
|
|---|
| 432 |
|
|---|
| 433 | } # end export_alt()
|
|---|
| 434 |
|
|---|
| 435 |
|
|---|
| 436 | ## DNSBL::autolist_block()
|
|---|
| 437 | # check if a block should be autolisted
|
|---|
| 438 | sub autolist_block {
|
|---|
| 439 | my $self = shift;
|
|---|
| 440 | my $block = shift;
|
|---|
| 441 |
|
|---|
| 442 | my $cidr = new NetAddr::IP "$block";
|
|---|
| 443 | my $sth = $dbh->prepare("select count(*) from iplist where ip << ?");
|
|---|
| 444 | $sth->execute("$cidr");
|
|---|
| 445 | my ($count) = $sth->fetchrow_array;
|
|---|
| 446 |
|
|---|
| 447 | return 1 if $count >= $autolist{$cidr->masklen};
|
|---|
| 448 | return 0;
|
|---|
| 449 | } # end autolist_block()
|
|---|
| 450 |
|
|---|
| 451 |
|
|---|
| 452 | # make Perl happy
|
|---|
| 453 | 1;
|
|---|
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