trunk/gosa-si/modules/ArpHandler.pm

   1 package ArpHandler;
   2
   3 use Exporter;
   4 @ISA = ("Exporter");
   5
   6 use strict;
   7 use warnings;
   8 use GOSA::GosaSupportDaemon;
   9 use POSIX;
  10 use Fcntl;
  11 use Net::LDAP;
  12 use Net::LDAP::LDIF;
  13 use Net::LDAP::Entry;
  14 use Net::DNS;
  15 use Switch;
  16 use Data::Dumper;
  17 use Socket;
  18
  19 # Don't start if some of the modules are missing
  20 my $start_service=1;
  21 my $lookup_vendor=1;
  22 BEGIN{
  23         unless(eval('use Socket qw(PF_INET SOCK_DGRAM inet_ntoa sockaddr_in)')) {
  24                 $start_service=0;
  25         }
  26         unless(eval('use POE qw(Component::Pcap Component::ArpWatch)')) {
  27                 $start_service=0;
  28         }
  29         unless(eval('use Net::MAC::Vendor')) {
  30                 $lookup_vendor=0;
  31         }
  32 }
  33
  34 END{}
  35
  36 my ($timeout, $mailto, $mailfrom, $user, $group);
  37 my ($arp_enabled, $arp_interface, $ldap_uri, $ldap_base, $ldap_admin_dn, $ldap_admin_password);
  38 my $hosts_database={};
  39 my $ldap;
  40
  41 my %cfg_defaults =
  42 (
  43     "ArpHandler" => {
  44         "enabled"             => [\$arp_enabled,         "true"],
  45         "interface"           => [\$arp_interface,       "all"],
  46     },
  47     "server" => {
  48         "ldap-uri"            => [\$ldap_uri,            ""],
  49         "ldap-base"           => [\$ldap_base,           ""],
  50         "ldap-admin-dn"       => [\$ldap_admin_dn,       ""],
  51         "ldap-admin-password" => [\$ldap_admin_password, ""],
  52     },
  53 );
  54
  55 #===  FUNCTION  ================================================================
  56 #         NAME:  read_configfile
  57 #   PARAMETERS:  cfg_file - string -
  58 #      RETURNS:  nothing
  59 #  DESCRIPTION:  read cfg_file and set variables
  60 #===============================================================================
  61 sub local_read_configfile {
  62         my $cfg;
  63         if( defined( $main::cfg_file) && ( (-s $main::cfg_file) > 0 )) {
  64                 if( -r $main::cfg_file ) {
  65                         $cfg = Config::IniFiles->new( -file => $main::cfg_file );
  66                 } else {
  67                         print STDERR "Couldn't read config file!";
  68                 }
  69         } else {
  70                 $cfg = Config::IniFiles->new() ;
  71         }
  72         foreach my $section (keys %cfg_defaults) {
  73                 foreach my $param (keys %{$cfg_defaults{ $section }}) {
  74                         my $pinfo = $cfg_defaults{ $section }{ $param };
  75                         ${@$pinfo[0]} = $cfg->val( $section, $param, @$pinfo[1] );
  76                 }
  77         }
  78 }
  79
  80 sub get_module_info {
  81         my @info = (undef,
  82                 undef,
  83         );
  84
  85         &local_read_configfile();
  86         # Don't start if some of the modules are missing
  87         if(($arp_enabled eq 'true') && $start_service) {
  88                 if($lookup_vendor) {
  89                         eval("Net::MAC::Vendor::load_cache('file:///usr/lib/gosa-si/modules/oui.txt')");
  90                         if($@) {
  91                                 &main::daemon_log("Loading OUI cache file failed! MAC Vendor lookup disabled", 1);
  92                                 $lookup_vendor=0;
  93                         } else {
  94                                 &main::daemon_log("Loading OUI cache file suceeded!", 6);
  95                         }
  96                 }
  97                 my $ldap_handle = &main::get_ldap_handle();
  98
  99                 # When interface is not configured (or 'all'), start arpwatch on all possible interfaces
 100                 if ((!defined($arp_interface)) || $arp_interface eq 'all') {
 101                         foreach my $device(&get_interfaces) {
 102                                 # TODO: Need a better workaround for IPv4-to-IPv6 bridges
 103                                 if($device =~ m/^sit\d+$/) {
 104                                         next;
 105                                 }
 106
 107                                 # If device has a valid mac address
 108                                 # TODO: Check if this should be the right way
 109                                 if(not(&get_mac($device) eq "00:00:00:00:00:00")) {
 110                                         &main::daemon_log("Starting ArpWatch on $device", 1);
 111                                         POE::Session->create(
 112                                                 inline_states => {
 113                                                         _start => sub {
 114                                                                 &start(@_,$device);
 115                                                         },
 116                                                         _stop => sub {
 117                                                                 $_[KERNEL]->post( sprintf("arp_watch_$device") => 'shutdown' )
 118                                                         },
 119                                                         got_packet => \&got_packet,
 120                                                 },
 121                                         );
 122                                 }
 123                         }
 124                 } else {
 125                         foreach my $device(split(/[\s,]+/, $arp_interface)) {
 126                                 &main::daemon_log("Starting ArpWatch on $device", 1);
 127                                 POE::Session->create(
 128                                         inline_states => {
 129                                                 _start => sub {
 130                                                         &start(@_,$device);
 131                                                 },
 132                                                 _stop => sub {
 133                                                         $_[KERNEL]->post( sprintf("arp_watch_$device") => 'shutdown' )
 134                                                 },
 135                                                 got_packet => \&got_packet,
 136                                         },
 137                                 );
 138                         }
 139                 }
 140         } else {
 141                 &main::daemon_log("ArpHandler disabled. Not starting any capture processes");
 142         }
 143         return \@info;
 144 }
 145
 146 sub process_incoming_msg {
 147         return 1;
 148 }
 149
 150 sub start {
 151         my $device = (exists($_[ARG0])?$_[ARG0]:'eth0');
 152         POE::Component::ArpWatch->spawn(
 153                 Alias => sprintf("arp_watch_$device"),
 154                 Device => $device,
 155                 Dispatch => 'got_packet',
 156                 Session => $_[SESSION],
 157         );
 158
 159         $_[KERNEL]->post( sprintf("arp_watch_$device") => 'run' );
 160 }
 161
 162 sub got_packet {
 163         my ($kernel, $heap, $sender, $packet) = @_[KERNEL, HEAP, SENDER, ARG0];
 164
 165         if(     $packet->{source_haddr} eq "00:00:00:00:00:00" ||
 166                 $packet->{source_haddr} eq "ff:ff:ff:ff:ff:ff" ||
 167                 $packet->{source_ipaddr} eq "0.0.0.0") {
 168                 return;
 169         }
 170
 171         my $capture_device = sprintf "%s", $kernel->alias_list($sender) =~ /^arp_watch_(.*)$/;
 172
 173         my $ldap_handle = &main::get_ldap_handle();
 174     if(!exists($hosts_database->{$packet->{source_haddr}})) {
 175                 my $dnsname= gethostbyaddr(inet_aton($packet->{source_ipaddr}), AF_INET) || $packet->{source_ipaddr};
 176                 my $ldap_result=&get_host_from_ldap($packet->{source_haddr});
 177                 if(exists($ldap_result->{dn})) {
 178                         $hosts_database->{$packet->{source_haddr}}=$ldap_result;
 179                         $hosts_database->{$packet->{source_haddr}}->{dnsname}= $dnsname;
 180                         if(!exists($ldap_result->{ipHostNumber})) {
 181                                 $hosts_database->{$packet->{source_haddr}}->{ipHostNumber}=$packet->{source_ipaddr};
 182                         } else {
 183                                 if(!($ldap_result->{ipHostNumber} eq $packet->{source_ipaddr})) {
 184                                         &main::daemon_log(
 185                                                 "Current IP Address ".$packet->{source_ipaddr}.
 186                                                 " of host ".$hosts_database->{$packet->{source_haddr}}->{dnsname}.
 187                                                 " differs from LDAP (".$ldap_result->{ipHostNumber}.")", 4);
 188                                 }
 189                         }
 190                         $hosts_database->{$packet->{source_haddr}}->{dnsname}=$dnsname;
 191                         &main::daemon_log("Host was found in LDAP as ".$ldap_result->{dn}, 8);
 192                 } else {
 193                         $hosts_database->{$packet->{source_haddr}}={
 194                                 macAddress => $packet->{source_haddr},
 195                                 ipHostNumber => $packet->{source_ipaddr},
 196                                 dnsname => $dnsname,
 197                                 cn => (($dnsname =~ /^(\d){1,3}\.(\d){1,3}\.(\d){1,3}\.(\d){1,3}/) ? $dnsname : sprintf "%s", $dnsname =~ /([^\.]+)\./),
 198                                 macVendor => (($lookup_vendor) ? &get_vendor_for_mac($packet->{source_haddr}) : "Unknown Vendor"),
 199                         };
 200                         &main::daemon_log("Host was not found in LDAP (".($hosts_database->{$packet->{source_haddr}}->{dnsname}).")",6);
 201                         &main::daemon_log(
 202                                 "New Host ".($hosts_database->{$packet->{source_haddr}}->{dnsname}).
 203                                 ": ".$hosts_database->{$packet->{source_haddr}}->{ipHostNumber}.
 204                                 "/".$hosts_database->{$packet->{source_haddr}}->{macAddress},4);
 205                         &add_ldap_entry(
 206                                 $ldap_handle,
 207                                 $ldap_base,
 208                                 $hosts_database->{$packet->{source_haddr}}->{macAddress},
 209                                 'new-system',
 210                                 $hosts_database->{$packet->{source_haddr}}->{ipHostNumber},
 211                                 'interface',
 212                                 $hosts_database->{$packet->{source_haddr}}->{macVendor});
 213                 }
 214                 $hosts_database->{$packet->{source_haddr}}->{device}= $capture_device;
 215         } else {
 216                 if(!($hosts_database->{$packet->{source_haddr}}->{ipHostNumber} eq $packet->{source_ipaddr})) {
 217                         &main::daemon_log(
 218                                 "IP Address change of MAC ".$packet->{source_haddr}.
 219                                 ": ".$hosts_database->{$packet->{source_haddr}}->{ipHostNumber}.
 220                                 "->".$packet->{source_ipaddr}, 4);
 221                         $hosts_database->{$packet->{source_haddr}}->{ipHostNumber}= $packet->{source_ipaddr};
 222                         &change_ldap_entry(
 223                                 $ldap_handle,
 224                                 $ldap_base,
 225                                 $hosts_database->{$packet->{source_haddr}}->{macAddress},
 226                                 'ip-changed',
 227                                 $hosts_database->{$packet->{source_haddr}}->{ipHostNumber},
 228                         );
 229
 230                 }
 231                 &main::daemon_log("Host already in cache (".($hosts_database->{$packet->{source_haddr}}->{device})."->".($hosts_database->{$packet->{source_haddr}}->{dnsname}).")",8);
 232         }
 233 }
 234
 235 sub get_host_from_ldap {
 236         my $mac=shift;
 237         my $result={};
 238
 239     my $ldap_handle = &main::get_ldap_handle();
 240         if(defined($ldap_handle)) {
 241                 my $ldap_result= &search_ldap_entry(
 242                         $ldap_handle,
 243                         $ldap_base,
 244                         "(|(macAddress=$mac)(dhcpHWAddress=ethernet $mac))"
 245                 );
 246
 247                 if(defined($ldap_result) && $ldap_result->count==1) {
 248                         if(exists($ldap_result->{entries}[0]) &&
 249                                 exists($ldap_result->{entries}[0]->{asn}->{objectName}) &&
 250                                 exists($ldap_result->{entries}[0]->{asn}->{attributes})) {
 251
 252                                 for my $attribute(@{$ldap_result->{entries}[0]->{asn}->{attributes}}) {
 253                                         if($attribute->{type} eq 'cn') {
 254                                                 $result->{cn} = $attribute->{vals}[0];
 255                                         }
 256                                         if($attribute->{type} eq 'macAddress') {
 257                                                 $result->{macAddress} = $attribute->{vals}[0];
 258                                         }
 259                                         if($attribute->{type} eq 'dhcpHWAddress') {
 260                                                 $result->{dhcpHWAddress} = $attribute->{vals}[0];
 261                                         }
 262                                         if($attribute->{type} eq 'ipHostNumber') {
 263                                                 $result->{ipHostNumber} = $attribute->{vals}[0];
 264                                         }
 265                                 }
 266                         }
 267                         $result->{dn} = $ldap_result->{entries}[0]->{asn}->{objectName};
 268                 }
 269         }
 270
 271         return $result;
 272 }
 273
 274
 275 #===  FUNCTION  ================================================================
 276 #         NAME:  get_mac
 277 #   PARAMETERS:  interface name (i.e. eth0)
 278 #      RETURNS:  (mac address)
 279 #  DESCRIPTION:  Uses ioctl to get mac address directly from system.
 280 #===============================================================================
 281 sub get_mac {
 282         my $ifreq= shift;
 283         my $result;
 284         if ($ifreq && length($ifreq) > 0) {
 285                 if($ifreq eq "all") {
 286                         $result = "00:00:00:00:00:00";
 287                 } else {
 288                         my $SIOCGIFHWADDR= 0x8927;     # man 2 ioctl_list
 289
 290                         socket SOCKET, PF_INET, SOCK_DGRAM, getprotobyname('ip')
 291                                 or die "socket: $!";
 292
 293                         if(ioctl SOCKET, $SIOCGIFHWADDR, $ifreq) {
 294                                 my ($if, $mac)= unpack 'h36 H12', $ifreq;
 295
 296                                 if (length($mac) > 0) {
 297                                         $mac=~ m/^([0-9a-f][0-9a-f])([0-9a-f][0-9a-f])([0-9a-f][0-9a-f])([0-9a-f][0-9a-f])([0-9a-f][0-9a-f])([0-9a-f][0-9a-f])$/;
 298                                         $mac= sprintf("%s:%s:%s:%s:%s:%s", $1, $2, $3, $4, $5, $6);
 299                                         $result = $mac;
 300                                 }
 301                         }
 302                 }
 303         }
 304         return $result;
 305 }
 306
 307 sub get_vendor_for_mac {
 308         my $mac=shift;
 309         my $result="Unknown Vendor";
 310
 311         if(defined($mac)) {
 312                 my $vendor= Net::MAC::Vendor::fetch_oui_from_cache(Net::MAC::Vendor::normalize_mac($mac));
 313                 if(length($vendor) > 0) {
 314                         $result= @{$vendor}[0];
 315                 }
 316                 &main::daemon_log("Looking up Vendor for MAC ".$mac.": $result", 4);
 317         }
 318
 319         return $result;
 320 }
 321
 322 #===  FUNCTION  ================================================================
 323 #         NAME:  add_ldap_entry
 324 #      PURPOSE:  adds an element to ldap-tree
 325 #   PARAMETERS:
 326 #      RETURNS:  none
 327 #  DESCRIPTION:  ????
 328 #       THROWS:  no exceptions
 329 #     COMMENTS:  none
 330 #     SEE ALSO:  n/a/bin
 331 #===============================================================================
 332 sub add_ldap_entry {
 333         my ($ldap_tree, $ldap_base, $mac, $gotoSysStatus, $ip, $interface, $desc) = @_;
 334         if(defined($ldap_tree)) {
 335                 my $dn = "cn=".$hosts_database->{$mac}->{cn}.",ou=incoming,$ldap_base";
 336                 my $s_res = &search_ldap_entry($ldap_tree, $ldap_base, "(|(macAddress=$mac)(dhcpHWAddress=ethernet $mac))");
 337                 my $c_res = (defined($s_res))?$s_res->count:0;
 338                 if($c_res == 1) {
 339                         &main::daemon_log("WARNING: macAddress $mac already in LDAP", 1);
 340                         return;
 341                 } elsif($c_res > 0) {
 342                         &main::daemon_log("ERROR: macAddress $mac exists $c_res times in LDAP", 1);
 343                         return;
 344                 }
 345
 346                 # create LDAP entry
 347                 my $entry = Net::LDAP::Entry->new( $dn );
 348                 $entry->dn($dn);
 349                 $entry->add("objectClass" => "GOhard");
 350                 $entry->add("cn" => $hosts_database->{$mac}->{cn});
 351                 $entry->add("macAddress" => $mac);
 352                 if(defined $gotoSysStatus) {$entry->add("gotoSysStatus" => $gotoSysStatus)}
 353                 if(defined $ip) {$entry->add("ipHostNumber" => $ip) }
 354                 #if(defined $interface) { }
 355                 if(defined $desc) {$entry->add("description" => $desc) }
 356
 357                 # submit entry to LDAP
 358                 my $result = $entry->update ($ldap_tree);
 359
 360                 # for $result->code constants please look at Net::LDAP::Constant
 361                 if($result->code == 68) {   # entry already exists
 362                         &main::daemon_log("WARNING: $dn ".$result->error, 3);
 363                 } elsif($result->code == 0) {   # everything went fine
 364                         &main::daemon_log("add entry $dn to ldap", 1);
 365                 } else {  # if any other error occur
 366                         &main::daemon_log("ERROR: $dn, ".$result->code.", ".$result->error, 1);
 367                 }
 368         } else {
 369                 &main::daemon_log("Not adding new Entry: LDAP disabled", 6);
 370         }
 371         return;
 372 }
 373
 374
 375 #===  FUNCTION  ================================================================
 376 #         NAME:  change_ldap_entry
 377 #      PURPOSE:  ????
 378 #   PARAMETERS:  ????
 379 #      RETURNS:  ????
 380 #  DESCRIPTION:  ????
 381 #       THROWS:  no exceptions
 382 #     COMMENTS:  none
 383 #     SEE ALSO:  n/a
 384 #===============================================================================
 385 sub change_ldap_entry {
 386         my ($ldap_tree, $ldap_base, $mac, $gotoSysStatus, $ip) = @_;
 387
 388         if(defined($ldap_tree)) {
 389                 # check if ldap_entry exists or not
 390                 my $s_res = &search_ldap_entry($ldap_tree, $ldap_base, "(|(macAddress=$mac)(dhcpHWAddress=ethernet $mac))");
 391                 my $c_res = (defined $s_res)?$s_res->count:0;
 392                 if($c_res == 0) {
 393                         &main::daemon_log("WARNING: macAddress $mac not in LDAP", 1);
 394                         return;
 395                 } elsif($c_res > 1) {
 396                         &main::daemon_log("ERROR: macAddress $mac exists $c_res times in LDAP", 1);
 397                         return;
 398                 }
 399
 400                 my $s_res_entry = $s_res->pop_entry();
 401                 my $dn = $s_res_entry->dn();
 402                 my $replace = {
 403                         'gotoSysStatus' => $gotoSysStatus,
 404                 };
 405                 if (defined($ip)) {
 406                         $replace->{'ipHostNumber'} = $ip;
 407                 }
 408                 my $result = $ldap_tree->modify( $dn, replace => $replace );
 409
 410                 # for $result->code constants please look at Net::LDAP::Constant
 411                 if($result->code == 32) {   # entry doesnt exists
 412                         &add_ldap_entry($mac, $gotoSysStatus);
 413                 } elsif($result->code == 0) {   # everything went fine
 414                         &main::daemon_log("entry $dn changed successful", 1);
 415                 } else {  # if any other error occur
 416                         &main::daemon_log("ERROR: $dn, ".$result->code.", ".$result->error, 1);
 417                 }
 418         } else {
 419                 &main::daemon_log("Not changing Entry: LDAP disabled", 6);
 420         }
 421
 422         return;
 423 }
 424
 425 #===  FUNCTION  ================================================================
 426 #         NAME:  search_ldap_entry
 427 #      PURPOSE:  ????
 428 #   PARAMETERS:  [Net::LDAP] $ldap_tree - object of an ldap-tree
 429 #                string $sub_tree - dn of the subtree the search is performed
 430 #                string $search_string - either a string or a Net::LDAP::Filter object
 431 #      RETURNS:  [Net::LDAP::Search] $msg - result object of the performed search
 432 #  DESCRIPTION:  ????
 433 #       THROWS:  no exceptions
 434 #     COMMENTS:  none
 435 #     SEE ALSO:  n/a
 436 #===============================================================================
 437 sub search_ldap_entry {
 438         my ($ldap_tree, $sub_tree, $search_string) = @_;
 439         my $msg;
 440         if(defined($ldap_tree)) {
 441                 $msg = $ldap_tree->search( # perform a search
 442                         base   => $sub_tree,
 443                         filter => $search_string,
 444                 ) or &main::daemon_log("cannot perform search at ldap: $@", 1);
 445         }
 446         return $msg;
 447 }
 448
 449 # vim:ts=4:shiftwidth:expandtab
 450 1;