1 package ArpHandler;
3 use Exporter;
4 @ISA = ("Exporter");
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;
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 $lookup_vendor=0;
31 }
32 }
34 END{}
36 my ($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;
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 );
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 }
80 sub get_module_info {
81 my @info = (undef,
82 undef,
83 );
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 $ldap_handle = &main::get_ldap_handle();
99 # When interface is not configured (or 'all'), start arpwatch on all possible interfaces
100 if ((!defined($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+$/) {
104 next;
105 }
107 # If device has a valid mac address
108 # TODO: Check if this should be the right way
109 if(not(&get_mac($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 }
146 sub process_incoming_msg {
147 return 1;
148 }
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 );
159 $_[KERNEL]->post( sprintf("arp_watch_$device") => 'run' );
160 }
162 sub got_packet {
163 my ($kernel, $heap, $sender, $packet) = @_[KERNEL, HEAP, SENDER, ARG0];
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 }
171 my $capture_device = sprintf "%s", $kernel->alias_list($sender) =~ /^arp_watch_(.*)$/;
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 );
230 }
231 &main::daemon_log("Host already in cache (".($hosts_database->{$packet->{source_haddr}}->{device})."->".($hosts_database->{$packet->{source_haddr}}->{dnsname}).")",8);
232 }
233 }
235 sub get_host_from_ldap {
236 my $mac=shift;
237 my $result={};
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 $mac))"
245 );
247 if(defined($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})) {
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 }
271 return $result;
272 }
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
290 socket SOCKET, PF_INET, SOCK_DGRAM, getprotobyname('ip')
291 or die "socket: $!";
293 if(ioctl SOCKET, $SIOCGIFHWADDR, $ifreq) {
294 my ($if, $mac)= unpack 'h36 H12', $ifreq;
296 if (length($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 }
307 sub get_vendor_for_mac {
308 my $mac=shift;
309 my $result="Unknown Vendor";
311 if(defined($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 }
319 return $result;
320 }
322 #=== FUNCTION ================================================================
323 # NAME: add_ldap_entry
324 # PURPOSE: adds an element to ldap-tree
325 # PARAMETERS:
326 # RETURNS: none
327 # DESCRIPTION: ????
328 # THROWS: no exceptions
329 # COMMENTS: none
330 # SEE ALSO: n/a/bin
331 #===============================================================================
332 sub add_ldap_entry {
333 my ($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 }
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) }
357 # submit entry to LDAP
358 my $result = $entry->update ($ldap_tree);
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.", ".$result->error, 1);
367 }
368 } else {
369 &main::daemon_log("Not adding new Entry: LDAP disabled", 6);
370 }
371 return;
372 }
375 #=== FUNCTION ================================================================
376 # NAME: change_ldap_entry
377 # PURPOSE: ????
378 # PARAMETERS: ????
379 # RETURNS: ????
380 # DESCRIPTION: ????
381 # THROWS: no exceptions
382 # COMMENTS: none
383 # SEE ALSO: n/a
384 #===============================================================================
385 sub change_ldap_entry {
386 my ($ldap_tree, $ldap_base, $mac, $gotoSysStatus, $ip) = @_;
388 if(defined($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 }
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 );
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 }
422 return;
423 }
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 }
449 # vim:ts=4:shiftwidth:expandtab
450 1;