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Server.pm
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Server.pm
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#!/bin/false
# Net::DHCPD::Server.pm
# Author: Denys Razumov
package Server; {
use strict;
use utf8;
use warnings;
use Thread;
use Socket;
use DBI;
use Net::DHCP::Packet;
use Net::DHCP::Constants;
use Benchmark ':hireswallclock';
use POSIX qw(setsid setuid strftime :signal_h);
use Sys::Syslog;
use Data::Dumper;
binmode(STDOUT, ':utf8');
BEGIN {
require Sys::Syslog;
Sys::Syslog->import('setlogsock', 'openlog', 'syslog', 'closelog');
openlog("dhcp-perl", "ndelay,pid", "local0");
}
END {
closelog();
}
sub new {
my $class = shift;
my $self = {
name => 'Net::DHCPD::Server',
version => '1.0',
BIND_ADDR => '0.0.0.0',
SERVER_PORT => '67',
CLIENT_PORT => '68',
DHCP_SERVER_ID => undef,
MIRROR => undef,
DBDATASOURCE => 'mysql:dhcp:127.0.0.1',
DBLOGIN => 'dhcp',
DBPASS => 'dhcp',
THREADS_COUNT => 4,
PIDFILE => '/var/run/dhcpd.pid',
DEBUG => 0,
DAEMON => undef,
fromaddr => undef,
dhcpreq => undef,
dhcpreqparams => undef,
dhcpresp => undef,
RUNNING => 0,
lease_free => '',
lease_add => '',
lease_update => '',
lease_time_get => '',
lease_check => '',
lease_get => '',
lease_free_get => '',
is_fixed => '',
lease_fixed_check => '',
lease_fixed_get => '',
lease_fixed_get2 => '',
get_routing => '',
get_subnet => '',
get_subnet_gw => '',
get_subnet_guest => '',
get_requested_data_opt82 => '',
log_detailed => '',
dbh => undef,
dhcp_opt82_vlan_id => 'NULL',
dhcp_opt82_unit_id => 'NULL',
dhcp_opt82_port_id => 'NULL',
dhcp_opt82_chasis_id => 'NULL',
dhcp_opt82_subscriber_id => 'NULL'
};
bless $self, $class;
return $self;
}
sub set {
# my ($self) = shift;
# my ($param) = $_[0];
# my ($value) = $[1];
my ($self) = shift;
$self->logger(9, "Function: " . (caller(0))[3]);
if ($_[1] && $_[1] ne '') {
$self->logger(1, "Set: $_[0] = '$_[1]'");
$self->{$_[0]} = $_[1];
}
}
sub signal_handler {
# my ($self) = shift;
my ($self) = shift;
$self->logger(9, "Function: " . (caller(0))[3]);
$self->set('RUNNING', 0);
$self->stop();
$_->kill('KILL')->detach() foreach Thread->list();
}
sub start {
# my ($self) = shift;
my ($self) = shift;
if (!defined($self->{DHCP_SERVER_ID})) {
$self->logger(0, "DHCP_SERVER_ID: must be real ip!");
exit;
}
$self->logger(0, "BIND_ADDR: $self->{BIND_ADDR}, THREADS_COUNT: $self->{THREADS_COUNT}, PIDFILE: $self->{PIDFILE}");
$self->daemon() if (defined($self->{DAEMON}));
$self->{RUNNING} = 1;
$self->run();
}
sub stop {
# my ($self) = shift;
my ($self) = shift;
$self->logger(9, "Function: " . (caller(0))[3]);
$self->{RUNNING} = 0;
close($self->{SOCKET_RCV});
}
sub logger {
# my ($self) = shift;
# my ($level) = $_[0];
# my ($message) = $_[1];
my ($self) = shift;
my ($tid) = Thread->tid();
if ($self->{DEBUG} >= $_[0]) {
syslog('info|local0', "Thread $tid: $_[1]");
print STDOUT strftime "[%d/%b/%Y %H:%M:%S] ", localtime;
print STDOUT "Thread $tid: $_[1]\n";
}
}
sub daemon {
# my ($self) = shift;
my ($self) = shift;
$self->logger(9, "Function: " . (caller(0))[3]);
delete @ENV{qw(IFS CDPATH ENV BASH_ENV)};
#POSIX::setuid(65534) or die "Can't set uid: $!\n"; # nobody
POSIX::setsid or die "Can't start a new session: $!\n";
defined(my $tm = POSIX::fork()) or die "Can't fork: $!\n";
exit if $tm;
POSIX::umask 0;
POSIX::chdir("/");
open(STDIN, "+>/dev/null") or die "Can't open STDIN: $!\n";
open(STDOUT, "+>&STDIN") or die "Can't open STDOUT: $!\n";
open(STDERR, "+>&STDIN") or die "Can't open STDERR: $!\n";
$self->logger(0, "Daemon mode");
}
sub write_pid {
# my ($self) = shift;
my ($self) = shift;
$self->logger(9, "Function: " . (caller(0))[3]);
if (defined($self->{PIDFILE})) {
open FILE, "> $self->{PIDFILE}" || $self->logger(0, "PID file save error: $!");
print FILE "$$\n";
close FILE;
}
}
sub add_mirror {
# my ($self) = shift;
my ($self) = shift;
$self->logger(9, "Function: " . (caller(0))[3]);
if (defined($self->{MIRROR})) {
$self->{ADDR_MIRROR} = sockaddr_in($self->{SERVER_PORT}, inet_aton($self->{MIRROR}));
}
}
sub send_mirror {
# my ($self) = shift;
# my $dhcpresppkt = $_[0];
my ($self) = shift;
$self->logger(9, "Function: " . (caller(0))[3]);
send($self->{SOCKET_RCV}, $_[0], 0, $self->{ADDR_MIRROR}) ||
$self->logger(1, "send mirr error: $!") if (defined($self->{ADDR_MIRROR}));
}
sub open_socket {
# my ($self) = shift;
my ($self) = shift;
$self->logger(9, "Function: " . (caller(0))[3]);
socket($self->{SOCKET_RCV}, PF_INET, SOCK_DGRAM, getprotobyname('udp')) || die "Socket creation error: $@\n";
bind($self->{SOCKET_RCV}, sockaddr_in($self->{SERVER_PORT}, inet_aton($self->{BIND_ADDR}))) || die "bind: $!";
}
sub run {
# my ($self) = shift;
my ($self) = shift;
$self->logger(9, "Function: " . (caller(0))[3]);
# write PID to file
$self->write_pid();
# broadcast address
$self->{ADDR_BCAST} = sockaddr_in($self->{CLIENT_PORT}, INADDR_BROADCAST);
$self->add_mirror();
# open listening socket
$self->open_socket();
# start threads
for (1 .. ($self->{THREADS_COUNT} - 1)) {Thread->new({ 'context' => 'void' }, sub {$self->request_loop()});}
$self->request_loop();
# delete PID file on exit
if (defined($self->{PIDFILE})) {unlink($self->{PIDFILE});}
$self->logger(0, "Main: END!");
}
sub request_loop {
# my ($self) = shift;
my ($self) = shift;
my ($buf); # recv data
my ($t0, $t1, $td); # perfomance data
my $tid = Thread->tid(); # thread ID
$self->logger(9, "Function: " . (caller(0))[3]);
$self->logger(0, "START");
# each thread make its own connection to DB
# connect($data_source, $username, $password, \%attr)
# dbi:DriverName:database=database_name;host=hostname;port=port
until ($self->{dbh} = DBI->connect("DBI:" . $self->{DBDATASOURCE}, $self->{DBLOGIN}, $self->{DBPASS})) {
$self->logger(0, "Could not connect to database: $DBI::errstr");
$self->logger(0, "Sleeping 10 sec to retry");
sleep(10);
}
if (defined($self->{dbh}) == 0) {
$self->logger(0, "Could not connect to database: $DBI::errstr");
$self->thread_exit(1);
}
$self->{dbh}->{mysql_auto_reconnect} = 1;
if ($tid != 0) {
# disable signals receiving on creted threads and set handler for KILL signal
my $sigset = POSIX::SigSet->new(SIGINT, SIGTERM, SIGHUP); # define the signals to block
my $old_sigset = POSIX::SigSet->new; # where the old sigmask will be kept
unless (defined sigprocmask(SIG_BLOCK, $sigset, $old_sigset)) {die "Could not unblock SIGINT\n";}
$SIG{KILL} = sub {
$self->logger(0, "END by sig handler");
$self->{dbh}->disconnect;
$self->thread_exit(0);
};
}
while ($self->{RUNNING} == 1) {
$buf = undef;
eval {
# catch fatal errors
# receive packet
$self->{fromaddr} = recv($self->{SOCKET_RCV}, $buf, 16384, 0) || $self->logger(0, "recv err: $!");
next if ($!); # continue loop if an error occured
# filter to small packets
next if (length($buf) < 236); # 300
if ($self->{DEBUG} > 0) {$t0 = Benchmark->new;}
# parce data to dhcp structes
$self->{dhcpreq} = Net::DHCP::Packet->new($buf);
$self->{dhcpreqparams} = $self->get_req_param($self->{dhcpreq}, DHO_DHCP_PARAMETER_REQUEST_LIST());
# filter bad params in head
next if ($self->{dhcpreq}->op() != BOOTREQUEST || $self->{dhcpreq}->isDhcp() == 0);
next if ($self->{dhcpreq}->htype() != HTYPE_ETHER || $self->{dhcpreq}->hlen() != 6);
# bad DHCP message!
next if ($self->get_req_param($self->{dhcpreq}, DHO_DHCP_MESSAGE_TYPE()) eq '');
# Is message for us?
next if ($self->check_for_me());
# RRAS client, ignory them
next if ($self->get_req_raw_param($self->{dhcpreq}, DHO_USER_CLASS()) eq "RRAS.Microsoft");
# send duplicate of received packet to mirror
$self->send_mirror($buf);
# log all to db
$self->{mac} = $self->FormatMAC(substr($self->{dhcpreq}->chaddr(), 0, (2 * $self->{dhcpreq}->hlen())));
$self->GenDHCPRespPkt();
$self->GetRelayAgentOptions();
$self->db_log_detailed();
# handle packet
my $type = $self->get_req_param($self->{dhcpreq}, DHO_DHCP_MESSAGE_TYPE());
if ($type == DHCPDISCOVER) {$self->handle_discover();}#-> DHCPOFFER
elsif ($type == DHCPREQUEST) {$self->handle_request();}#-> DHCPACK/DHCPNAK
elsif ($type == DHCPDECLINE) {$self->handle_decline();}
elsif ($type == DHCPRELEASE) {$self->handle_release();}
elsif ($type == DHCPINFORM) {$self->handle_inform();}#-> DHCPACK
else {
$self->reset();
}
$self->reset();
if ($self->{DEBUG} > 0) {
$t1 = Benchmark->new;
$td = timediff($t1, $t0);
$self->logger(2, "The code took: " . timestr($td));
}
}; # end of 'eval' blocks
$self->logger(0, "Caught error in main loop: $@") if ($@);
}
$self->{dbh}->disconnect;
$self->thread_exit(0);
}
sub reset {
my ($self) = shift;
$self->{mac} = undef;
$self->{dhcpreq} = undef;
$self->{dhcpreqparams} = undef;
$self->{dhcpresp} = undef;
$self->{fromaddr} = undef;
$self->{dhcp_opt82_chasis_id} = 'NULL';
$self->{dhcp_opt82_unit_id} = 'NULL';
$self->{dhcp_opt82_port_id} = 'NULL';
$self->{dhcp_opt82_vlan_id} = 'NULL';
$self->{dhcp_opt82_subscriber_id} = 'NULL';
}
sub thread_exit($) {
# my ($self) = shift;
# my ($code) = $_[0];
my ($self) = shift;
$self->logger(9, "Function: " . (caller(0))[3]);
$self->logger(0, "END code: " . $_[0]);
# need to fix exit tread
Thread->exit($_[0]) if Thread->can('exit');
exit($_[0]);
}
sub send_reply {
# my ($self) = shift;
my ($self) = shift;
my ($dhcpresppkt, $toaddr);
# add last!!!!
my $agent_opt = $self->get_req_raw_param($self->{dhcpreq}, DHO_DHCP_AGENT_OPTIONS());
$self->logger(9, "Function: " . (caller(0))[3]);
$self->{dhcpresp}->addOptionRaw(DHO_DHCP_AGENT_OPTIONS(), $agent_opt) if ($agent_opt ne '');
$dhcpresppkt = $self->{dhcpresp}->serialize();
if ($self->{dhcpreq}->giaddr() eq '0.0.0.0') {
# client local, not relayed
# always broadcast DHCPNAK
if ($self->{dhcpresp}->DHO_DHCP_MESSAGE_TYPE() == DHCPNAK) {$toaddr = $self->{ADDR_BCAST};}
else {
if ($self->{dhcpreq}->ciaddr() eq '0.0.0.0') {
# ALL HERE NON RFC 2131 4.1 COMPLIANT!!!
# perl can not send to hw addr unicast with ip 0.0.0.0, and we send broadcast
if ($self->{dhcpreq}->flags() == 0 || 1) {
# send unicast XXXXXXXXX - flags ignored!
# here we mast send unicast to hw addr, ip 0.0.0.0
my ($port, $addr) = unpack_sockaddr_in($self->{fromaddr});
my $ipaddr = inet_ntoa($addr);
if ($ipaddr eq '0.0.0.0') {$toaddr = $self->{ADDR_BCAST};}
# giaddr and ciaddr is zero but we know ip addr from received packet
else {$toaddr = sockaddr_in($self->{CLIENT_PORT}, $addr);}
}
# only this comliant to rfc 2131 4.1
else {$toaddr = $self->{ADDR_BCAST};}
}
# client have IP addr, send unicast
else {$toaddr = sockaddr_in($self->{CLIENT_PORT}, $self->{dhcpreq}->ciaddrRaw());}
}
}
# send to relay
else {$toaddr = sockaddr_in($self->{SERVER_PORT}, $self->{dhcpreq}->giaddrRaw());}
send($self->{SOCKET_RCV}, $dhcpresppkt, 0, $toaddr) || $self->logger(0, "send error: $!");
my ($port, $addr) = unpack_sockaddr_in($toaddr);
my $ipaddr = inet_ntoa($addr);
$self->logger(1, "Sending response to = $ipaddr:$port length = " . length($dhcpresppkt));
# send copy of packet to mirror, if specified
$self->send_mirror($dhcpresppkt);
}
sub GenDHCPRespPkt {
# my ($self) = shift;
my ($self) = shift;
$self->logger(9, "Function: " . (caller(0))[3]);
$self->{dhcpresp} = Net::DHCP::Packet->new(
Op => BOOTREPLY(),
Htype => $self->{dhcpreq}->htype(), #rfc2131 - From "Assigned Numbers" RFC
Hlen => $self->{dhcpreq}->hlen(), #rfc2131 - must be 6 ipv4
# Hops => $self->{dhcpreq->hops(), #rfc2131 - must be 0
Xid => $self->{dhcpreq}->xid(), #rfc2131 - must be from client DISCOVER
Secs => $self->{dhcpreq}->secs(), #rfc2131 - must be 0
Flags => $self->{dhcpreq}->flags(), #rfc2131 - must be from client DISCOVER
#Ciaddr => $_[0]->ciaddr(), #rfc2131 - must be 0
#Yiaddr => '0.0.0.0', #rfc2131 - must be from IP for client DISCOVER(will be setted at the next step)
Siaddr => $self->{dhcpreq}->siaddr(), #rfc2131 - must be from client DISCOVER if relayed
Giaddr => $self->{dhcpreq}->giaddr(), #rfc2131 - must be from client DISCOVER
Chaddr => $self->{dhcpreq}->chaddr(), #rfc2131 - must be from client DISCOVER
DHO_DHCP_MESSAGE_TYPE() => DHCPACK, # must be owerwritten
DHO_DHCP_SERVER_IDENTIFIER() => $self->{DHCP_SERVER_ID}
);
}
sub BuffToHEX($) {
# my ($self) = shift;
# my ($buf) = $_[0];
my ($self) = shift;
$self->logger(9, "Function: " . (caller(0))[3]);
$_[0] =~ s/(.)/sprintf("%02x", ord($1))/eg;
return ($_[0]);
}
sub unpackRelayAgent(%) {
# my ($self) = shift;
# my (@SubOptions) = @_;
my ($self) = shift;
my @SubOptions = @_;
my $buf;
$self->logger(9, "Function: " . (caller(0))[3]);
for (my $i = 0; defined($SubOptions[$i]); $i += 2) {
$buf .= "($SubOptions[$i])=" . $self->BuffToHEX($SubOptions[($i + 1)]) . ', ';
}
return ($buf);
}
sub GetRelayAgentOptions() {
my ($self) = shift;
my @RelayAgent;
$self->logger(9, "Function: " . (caller(0))[3]);
# no options, return
return(0) if (defined($self->{dhcpreq}->getOptionRaw(DHO_DHCP_AGENT_OPTIONS())) == 0);
@RelayAgent = $self->{dhcpreq}->decodeRelayAgent($self->{dhcpreq}->getOptionRaw(DHO_DHCP_AGENT_OPTIONS()));
$self->logger(1, "RelayAgent: " . @RelayAgent);
for (my $i = 0; defined($RelayAgent[$i]); $i += 2) {
if ($RelayAgent[$i] == 1) {
# Circuit ID
$self->logger(1, "RelayAgent Circuit ID: " . $RelayAgent[($i + 1)]);
next if (length($RelayAgent[($i + 1)]) < 4);
# first bytes must be: 00 04
# zte has 'eth 1/0/8:4096.444 0/0/0/0/0/0' (not packed string) /^(\w+)\s(\d+)\/(\d+)\/(\d+):(\d+)\.(\d+)\s(\d+)\/(\d+)\/(\d+)\/(\d+)\/(\d+)\/(\d+)$/
#$self->{dhcp_opt82_vlan_id} = unpack('n', substr($RelayAgent[($i + 1)], -4, 2)); # may be 's'
$RelayAgent[($i + 1)] =~ /(\d+)(?=\ )/;
$self->{dhcp_opt82_vlan_id} = $1;
$self->logger(1, "RelayAgent VLan: " . $self->{dhcp_opt82_vlan_id});
#$self->{dhcp_opt82_unit_id} = unpack('C', substr($RelayAgent[($i + 1)], -2, 1));
$RelayAgent[($i + 1)] =~ /(\d+)(?=\/\d+:)/;
$self->{dhcp_opt82_unit_id} = $1;
$self->logger(1, "RelayAgent Unit: " . $self->{dhcp_opt82_unit_id});
#$self->{dhcp_opt82_port_id} = unpack('C', substr($RelayAgent[($i + 1)], -1, 1));
$RelayAgent[($i + 1)] =~ /(\d+)(?=:)/;
$self->{dhcp_opt82_port_id} = $1;
$self->logger(1, "RelayAgent Port: " . $self->{dhcp_opt82_port_id});
}
elsif ($RelayAgent[$i] == 2) {
# Remote ID
next if (length($RelayAgent[($i + 1)]) < 6);
# first bytes must be: 00 06 or 01 06 or 02 xx
# first digit - format/data type, second - len
$self->{dhcp_opt82_chasis_id} = $self->FormatMAC(unpack("H*", substr($RelayAgent[($i + 1)], - 6, 6)));
$self->logger(1, "RelayAgent 4: " . $self->{dhcp_opt82_chasis_id});
# 02 xx - contain vlan num, undone
}
elsif ($RelayAgent[$i] == 6) {
# Subscriber ID
$self->{dhcp_opt82_subscriber_id} = $RelayAgent[($i + 1)];
$self->logger(1, "RelayAgent 5: " . $self->{dhcp_opt82_subscriber_id});
}
else {}
}
return (1);
} #done +-(need to move this function to server.pl)
sub FormatMAC {
# my ($self) = shift;
# my ($mac) = $_[0];
my ($self) = shift;
$self->logger(9, "Function: " . (caller(0))[3]);
$_[0] =~ /([0-9a-f]{2})?([0-9a-f]{2})?([0-9a-f]{2})?([0-9a-f]{2})?([0-9a-f]{2})?([0-9a-f]{2})/i;
return (lc(join(':', $1, $2, $3, $4, $5, $6)));
}
sub subnetBits {
# my ($self) = shift;
# my ($bits) = $_[0];
my ($self) = shift;
my $bcnt = 0;
$self->logger(9, "Function: " . (caller(0))[3]);
foreach (0 .. 31) {$bcnt++ if (vec(pack("L", unpack("N", pack("C4", split(/\./, $_[0])))), $_, 1) == 1);}
return ($bcnt);
}
sub mk_classless_routes_bin_mask {
# my ($self) = shift;
# my $net = $_[0];
# my $mask = $_[1];
# my $gw = $_[2];
my ($self) = shift;
$self->logger(9, "Function: " . (caller(0))[3]);
return ($self->mk_classless_routes_bin_prefixlen($_[0], $self->subnetBits($_[1]), $_[2]));
}
sub mk_classless_routes_bin_prefixlen {
# my ($self) = shift;
# my $net = $_[0];
# my $prefixlen = $_[1];
# my $gw = $_[2];
my ($self) = shift;
$self->logger(9, "Function: " . (caller(0))[3]);
my ($str) = pack('C', $_[1]);
if ($_[1] > 0) {
my ($s1, $s2, $s3, $s4) = split(/\./, $_[0]);
$str .= pack('C', $s1);
$str .= pack('C', $s2) if ($_[1] > 8);
$str .= pack('C', $s3) if ($_[1] > 16);
$str .= pack('C', $s4) if ($_[1] > 24);
}
$str .= pack('CCCC', split(/\./, $_[2]));
return ($str);
}
sub check_for_me {
# my ($self) = shift;
my ($self) = shift;
my ($identifier) = $self->get_req_param($self->{dhcpreq}, DHO_DHCP_SERVER_IDENTIFIER());
$self->logger(9, "Function: " . (caller(0))[3]);
return ($identifier ne '' && $identifier ne $self->{DHCP_SERVER_ID}) ? 1 : undef;
}
# params functions
# return value of param
sub get_req_param {
# my ($self) = shift;
# my $dhcppacket = $_[0];
# my $param = $_[1];
my ($self) = shift;
$self->logger(9, "Function: " . (caller(0))[3]);
return defined($_[0]->getOptionRaw($_[1])) ? $_[0]->getOptionValue($_[1]) : '';
}
# return raw value of param
sub get_req_raw_param {
# my ($self) = shift;
# my $dhcppacket = $_[0];
# my $param = $_[1];
my ($self) = shift;
$self->logger(9, "Function: " . (caller(0))[3]);
return defined($_[0]->getOptionRaw($_[1])) ? $_[0]->getOptionRaw($_[1]) : '';
}
# handlers functions
sub handle_discover {
# my ($self) = shift;
my $self = shift;
$self->logger(9, "Function: " . (caller(0))[3]);
# ciaddr = 0
# chaddr = client_mac
# requested_ip = client_ip or 0.0.0.0
# opt82 = true(always if enabled) or false
$self->db_check_requested_data();
if ($self->get_request_data() == 1) {$self->lease_offered();}
else {
# if AUTO_CONFIGURE (116) supported - send disable generate link local addr
if ($self->get_req_param($self->{dhcpreq}, DHO_AUTO_CONFIGURE()) ne '') {
$self->{dhcpresp}->addOptionValue(DHO_AUTO_CONFIGURE(), 0);
}
}
$self->send_reply();
}
sub handle_request {
# my ($self) = shift;
my ($self) = shift;
$self->logger(9, "Function: " . (caller(0))[3]);
$self->db_check_requested_data();
if ($self->get_request_data() == 1) {
if (($self->get_req_param($self->{dhcpreq}, DHO_DHCP_REQUESTED_ADDRESS()) ne $self->{dhcpresp}->yiaddr() && $self->{dhcpreq}->ciaddr() eq '0.0.0.0') ||
($self->get_req_param($self->{dhcpreq}, DHO_DHCP_REQUESTED_ADDRESS()) eq '' && $self->{dhcpreq}->ciaddr() ne $self->{dhcpresp}->yiaddr())) {
# NAK if requested addr not equal IP addr in DB
$self->logger(2, "Got REQUEST send NACK");
$self->lease_nak($self->{dhcpreq}->ciaddr());
}
else {
$self->logger(2, "Got REQUEST send ACK");
$self->lease_ack();
}
$self->send_reply();
}
else {
$self->lease_nak($self->get_req_param($self->{dhcpreq}, DHO_DHCP_REQUESTED_ADDRESS()));
$self->send_reply();
}
}
sub handle_decline {
# my ($self) = shift;
my ($self) = shift;
$self->logger(9, "Function: " . (caller(0))[3]);
$self->db_check_requested_data();
# ciaddr = 0
# request_ip = client_ip
$self->db_lease_decline();
}
sub handle_release {
# my ($self) = shift;
my ($self) = shift;
$self->logger(9, "Function: " . (caller(0))[3]);
$self->db_check_requested_data();
$self->lease_release();
}
sub handle_inform {
# my ($self) = shift;
my ($self) = shift;
$self->logger(9, "Function: " . (caller(0))[3]);
$self->logger(2, "Got REQUEST send ACK");
$self->db_check_requested_data();
$self->{dhcpresp}->{options}->{DHO_DHCP_MESSAGE_TYPE()} = pack('C', DHCPACK);
# ciaddr = client_ip
# request_ip = 0
if ($self->get_request_data() == 1) {$self->static_data_to_reply();}
$self->send_reply();
}
# handlers
# functions with their db functions
sub db_check_requested_data {
# my ($self) = shift;
my ($self) = shift;
$self->logger(9, "Function: " . (caller(0))[3]);
my $requested_ip = $self->get_req_param($self->{dhcpreq}, DHO_DHCP_REQUESTED_ADDRESS());
my $yiaddr = $self->{dhcpreq}->yiaddr();
my $ciaddr = $self->{dhcpreq}->ciaddr();
my $giaddr = $self->{dhcpreq}->giaddr();
$self->logger(2, $self->{dhcpreq}->toString());
$self->logger(3, "mac = $self->{mac} requested_ip = $requested_ip yiaddr = $yiaddr ciaddr = $ciaddr giaddr = $giaddr");
return;
}
sub static_data_to_reply {
my ($self) = shift;
$self->logger(9, "Function: " . (caller(0))[3]);
# do not add params if not requested
return() if (defined($self->{dhcpreqparams}) == 0);
if (index($self->{dhcpreqparams}, DHO_ROUTER_DISCOVERY()) != - 1) {$self->{dhcpresp}->addOptionValue(DHO_ROUTER_DISCOVERY(), 0);}
if (index($self->{dhcpreqparams}, DHO_NTP_SERVERS()) != - 1) {$self->{dhcpresp}->addOptionValue(DHO_NTP_SERVERS(), '8.8.8.8 8.8.8.8');}
if (index($self->{dhcpreqparams}, DHO_NETBIOS_NODE_TYPE()) != - 1) {$self->{dhcpresp}->addOptionValue(DHO_NETBIOS_NODE_TYPE(), 8);} # H-Node
# Option 43 must be last for Windows XP proper work
# https://support.microsoft.com/en-us/kb/953761
if (index($self->{dhcpreqparams}, DHO_VENDOR_ENCAPSULATED_OPTIONS()) != - 1) {
# 001 - NetBIOS over TCP/IP (NetBT): 00000002 (2) - disabled
# 002 - Release DHCP Lease on Shutdown: 00000001 (1) - enabled
# 255 - END
$self->{dhcpresp}->addOptionRaw(DHO_VENDOR_ENCAPSULATED_OPTIONS(),
"\x01\x04\x00\x00\x00\x02\x02\x04\x00\x00\x00\x01\xff");
}
}
sub get_request_data {
# my ($self) = shift;
my ($self) = shift;
my ($result);
my $lease = 0;
$self->logger(9, "Function: " . (caller(0))[3]);
my $requested_ip = ($self->get_req_param($self->{dhcpreq}, DHO_DHCP_REQUESTED_ADDRESS()) ne '') ? $self->get_req_param($self->{dhcpreq}, DHO_DHCP_REQUESTED_ADDRESS()) : '0.0.0.0' ;
my $ip = $self->{dhcpreq}->ciaddr();
$self->logger(9, sprintf("ip = %s, requested_ip = %s", $ip, $requested_ip));
# bound/renew/rebind
# ciaddr = client_ip
# request_ip = ''
if ($ip ne '0.0.0.0') {
$self->get_fixed_lease(my $fixed_lease, $ip);
$lease = $fixed_lease ? $fixed_lease : $self->get_lease($ip);
}
# request
# ciaddr = 0.0.0.0
# request_ip = client_ip
elsif ($requested_ip ne '0.0.0.0') {
$self->get_fixed_lease(my $fixed_lease, $requested_ip);
$lease = $fixed_lease ? $fixed_lease : $self->get_lease($requested_ip);
}
# lease exists
if ($lease != 0) {
$self->logger(0, sprintf("LEASE: Exists %s %s %s", $lease->{ip}, $lease->{mac}, $lease->{lease_time}));
$self->db_get_subnet($result, $lease->{subnet_id});
if ($result != 0) {
if ($self->is_fixed($lease->{subnet_id})) {
$self->get_fixed_lease2(my $s, $lease->{subnet_id});
$self->logger(0, sprintf("LEASE: Exists 111 %s %s %s", $s->{ip}, $s->{mac}, $s->{lease_time}));
if ($lease->{ip} ne $s->{ip}) {
return (0);
}
}
$self->{dhcpresp}->yiaddr($lease->{ip});
$self->db_data_to_reply($result);
$self->db_get_routing($lease->{subnet_id});
$self->static_data_to_reply();
return (1);
}
}
# lease doesn't exists
else {
$self->logger(0, sprintf("LEASE: Doesn't exists for %s", $self->{mac}));
$self->logger(3, sprintf("LEASE: Try to get free lease for %s", $self->{mac}));
# need subnet_id
$self->get_subnet_id(my $subnet, $self->{dhcpreq}->giaddr());
$self->logger(3, sprintf("SUBNET: %s", $subnet->{subnet_id}));
if ($self->is_fixed($subnet->{subnet_id})) {
$self->db_get_subnet($result, $subnet->{subnet_id});
$self->get_fixed_lease2($lease, $subnet->{subnet_id});
if ($lease->{ip}) {
$self->{dhcpresp}->yiaddr($lease->{ip});
$self->db_data_to_reply($result);
$self->db_get_routing($result->{subnet_id});
$self->static_data_to_reply();
return (1);
}
}
else {
$self->get_subnet_id($subnet, $self->{dhcpreq}->giaddr(), 'guest');
$self->logger(3, sprintf("SUBNET: %s", $subnet->{subnet_id}));
$self->db_get_subnet($result, $subnet->{subnet_id});
$self->get_free_lease($lease, $subnet->{subnet_id});
if ($lease->{ip}) {
$self->{dhcpresp}->yiaddr($lease->{ip});
$self->db_data_to_reply($result);
$self->db_get_routing($result->{subnet_id});
$self->static_data_to_reply();
return (1);
}
}
}
return (0);
}
sub db_get_subnet {
# my ($self) = shift;
# my $result = $_[0];
# my ($subnet_id) = $_[1];
my ($self) = shift;
my $sth;
$self->logger(9, "Function: " . (caller(0))[3]);
$self->logger(3, sprintf("SQL: $self->{get_subnet}", $_[1]));
$sth = $self->{dbh}->prepare(sprintf($self->{get_subnet}, $_[1]));
$sth->execute();
if ($sth->rows()) {
$_[0] = $sth->fetchrow_hashref();
$sth->finish();
return (1);
}
$sth->finish();
return (0);
}
sub get_subnet_id {
# my ($self) = shift;
# my $result = $_[0];
# my ($gw) = $_[1];
# my ($type) = $_[2];
my ($self) = shift;
$self->logger(9, "Function: " . (caller(0))[3]);
$self->logger(2, sprintf("SUBNET: get subnet_id by gw = %s", $_[1])) if (defined($_[2]) == 0);
$self->logger(2, sprintf("SUBNET: get subnet_id by gw = %s and type = %s", $_[1], $_[2])) if (defined($_[2]));
$self->db_get_subnet_id($_[0], $_[1], $_[2]);
}
sub db_get_subnet_id {
# my ($self) = shift;
# my $result = $_[0];
# my ($gw) = $_[1];
# my ($type) = $_[2];
my ($self) = shift;
my $sth;
$self->logger(9, "Function: " . (caller(0))[3]);
if ($_[2]) {$sth = $self->{dbh}->prepare(sprintf($self->{get_subnet_guest}, $_[1], $_[2]));}
else {$sth = $self->{dbh}->prepare(sprintf($self->{get_subnet_gw}, $_[1]));}
$sth->execute();
if ($sth->rows()) {$_[0] = $sth->fetchrow_hashref();$sth->finish();return (1);}
$sth->finish();
return (0);
}
sub db_data_to_reply {
# my ($self) = shift;
# my $result = $_[0];
my ($self) = shift;
$self->logger(9, "Function: " . (caller(0))[3]);
if (defined($_[0]->{dhcp_lease_time})) {
$self->{dhcpresp}->addOptionValue(DHO_DHCP_LEASE_TIME(), $_[0]->{dhcp_lease_time});
# function (typically 50%) of the full configured duration (or lease time) for a client's lease
if (defined($_[0]->{dhcp_renewal})) {
$self->{dhcpresp}->addOptionValue(DHO_DHCP_RENEWAL_TIME(), $_[0]->{dhcp_renewal});
#} else {
# $self->{dhcpresp}->addOptionValue(DHO_DHCP_RENEWAL_TIME(), ($_[0]->{dhcp_lease_time}/2));
}
# function (typically 87.5%) of the full configured duration (or lease time) for a client's lease
if (defined($_[0]->{dhcp_rebind_time})) {
$self->{dhcpresp}->addOptionValue(DHO_DHCP_REBINDING_TIME(), $_[0]->{dhcp_rebind_time});
#} else {
# $self->{dhcpresp}->addOptionValue(DHO_DHCP_REBINDING_TIME(), ($_[0]->{dhcp_lease_time}*7/8));
}
}
# do not add params if not requested
return() if (defined($self->{dhcpreqparams}) == 0);
if (index($self->{dhcpreqparams}, DHO_SUBNET_MASK()) != - 1 && defined($_[0]->{mask})) {$self->{dhcpresp}->addOptionValue(DHO_SUBNET_MASK(), $_[0]->{mask});}
if (index($self->{dhcpreqparams}, DHO_ROUTERS()) != - 1 && defined($_[0]->{gateway})) {$self->{dhcpresp}->addOptionValue(DHO_ROUTERS(), $_[0]->{gateway});}
if (index($self->{dhcpreqparams}, DHO_DOMAIN_NAME_SERVERS()) != - 1 && defined($_[0]->{dns1})) {$self->{dhcpresp}->addOptionValue(DHO_DOMAIN_NAME_SERVERS(), "$_[0]->{dns1} $_[0]->{dns2}");}
if (index($self->{dhcpreqparams}, DHO_HOST_NAME()) != - 1 && defined($_[0]->{hostname})) {$self->{dhcpresp}->addOptionValue(DHO_HOST_NAME(), $_[0]->{hostname});}
if (index($self->{dhcpreqparams}, DHO_DOMAIN_NAME()) != - 1 && defined($_[0]->{domain})) {$self->{dhcpresp}->addOptionValue(DHO_DOMAIN_NAME(), $_[0]->{domain});}
}
sub db_get_routing {
# my ($self) = shift;
# my $subnet_id = $_[0];
my ($self) = shift;
my ($sth, $opt33Enbled, $optClasslessRoutesCode);
$self->logger(9, "Function: " . (caller(0))[3]);
# do not add routes if not requested
return() if (defined($self->{dhcpreqparams}) == 0);
$opt33Enbled = index($self->{dhcpreqparams}, DHO_STATIC_ROUTES());
$opt33Enbled = undef if ($opt33Enbled == - 1);
$optClasslessRoutesCode = index($self->{dhcpreqparams}, 121);
if ($optClasslessRoutesCode == - 1) {
$optClasslessRoutesCode = index($self->{dhcpreqparams}, 249); # MSFT
if ($optClasslessRoutesCode == - 1) {$optClasslessRoutesCode = undef;}
else {$opt33Enbled = undef;$optClasslessRoutesCode = 249;}
}
else {$opt33Enbled = undef;$optClasslessRoutesCode = 121;}
return () if (defined($opt33Enbled) == 0 && defined($optClasslessRoutesCode) == 0);
$self->logger(2, sprintf("SQL: $self->{get_routing}", $_[0]));
$sth = $self->{dbh}->prepare(sprintf($self->{get_routing}, $_[0]));
$sth->execute();
if ($sth->rows()) {
my ($ref, $row);
my $opt33_data = undef; # routes to single hosts
my $opt_classless_routes_data = undef; # routes to nets
$ref = $sth->fetchall_arrayref;
foreach $row (@{$ref}) {
if (defined($opt33Enbled) && @$row[1] eq '255.255.255.255') {
# pack dst
$opt33_data .= pack('CCCC', split(/\./, @$row[0]));
# pack gw
$opt33_data .= pack('CCCC', split(/\./, @$row[2]));
}
$opt_classless_routes_data .= $self->mk_classless_routes_bin_mask(@$row[0], @$row[1], @$row[2]) if (defined($optClasslessRoutesCode));
}
$self->{dhcpresp}->addOptionRaw(DHO_STATIC_ROUTES(), $opt33_data) if (defined($opt33_data));
$self->{dhcpresp}->addOptionRaw($optClasslessRoutesCode, $opt_classless_routes_data) if (defined($opt_classless_routes_data));
}
$sth->finish();
}
sub lease_offered {
# my ($self) = shift;
my ($self) = shift;
$self->logger(9, "Function: " . (caller(0))[3]);
$self->{dhcpresp}->{options}->{DHO_DHCP_MESSAGE_TYPE()} = pack('C', DHCPOFFER);
$self->logger(0, sprintf("LEASE: Success OFFERED IP=%s for MAC=%s", $self->{dhcpresp}->yiaddr(), $self->{mac})) if ($self->add_lease($self->{dhcpresp}->yiaddr()) == 1);
}
sub lease_nak {
# my ($self) = shift;
# my ($ip) = $_[0];
my ($self) = shift;
$self->logger(9, "Function: " . (caller(0))[3]);
$self->{dhcpresp}->{options}->{DHO_DHCP_MESSAGE_TYPE()} = pack('C', DHCPNAK);
$self->{dhcpresp}->ciaddr('0.0.0.0');
$self->{dhcpresp}->yiaddr('0.0.0.0');
$self->free_lease($_[0]);
}
sub db_lease_decline {
# my ($self) = shift;
my ($self) = shift;
$self->logger(9, "Function: " . (caller(0))[3]);
# this function need to understand how to must work
#
# request_ip = client_ip
# ciaddr = 0
$self->logger(0, sprintf("Need to add functionality to this function, IP = %s already obtained by other client", $self->get_req_param($self->{dhcpreq}, DHO_DHCP_REQUESTED_ADDRESS())));
#my $sth = $self->{dbh}->prepare("");
#$sth->execute();
#$sth->finish();
return (0);
}
sub lease_release {
# my ($self) = shift;
# my ($ip) = $_[0];
my ($self) = shift;
$self->logger(9, "Function: " . (caller(0))[3]);
$self->free_lease($self->{dhcpreq}->ciaddr());
}
sub lease_ack {
# my ($self) = shift;
my ($self) = shift;
$self->logger(9, "Function: " . (caller(0))[3]);
$self->{dhcpresp}->{options}->{DHO_DHCP_MESSAGE_TYPE()} = pack('C', DHCPACK);
$self->update_lease_time();
}
sub db_log_detailed {
my ($self) = shift;
$self->logger(9, "Function: " . (caller(0))[3]);
my $client_ip = $self->{dhcpreq}->ciaddr();
my $gateway_ip = $self->{dhcpreq}->giaddr();
my $client_ident = $self->BuffToHEX($self->get_req_raw_param($self->{dhcpreq}, DHO_DHCP_CLIENT_IDENTIFIER()));
my $requested_ip = $self->get_req_param($self->{dhcpreq}, DHO_DHCP_REQUESTED_ADDRESS());
my $hostname = $self->get_req_param($self->{dhcpreq}, DHO_HOST_NAME());
my $dhcp_vendor_class = $self->get_req_param($self->{dhcpreq}, DHO_VENDOR_CLASS_IDENTIFIER());
my $dhcp_user_class = $self->get_req_param($self->{dhcpreq}, DHO_USER_CLASS());
my $type = $self->get_req_param($self->{dhcpreq}, DHO_DHCP_MESSAGE_TYPE());
$self->logger(3, sprintf("SQL: $self->{log_detailed}", $type, $self->{mac}, $client_ip, $gateway_ip,
$client_ident, $requested_ip, $hostname, $dhcp_vendor_class, $dhcp_user_class, $self->{dhcp_opt82_chasis_id},
$self->{dhcp_opt82_unit_id}, $self->{dhcp_opt82_port_id}, $self->{dhcp_opt82_vlan_id}, $self->{dhcp_opt82_subscriber_id}));
my $sth = $self->{dbh}->prepare(sprintf($self->{log_detailed}, $type, $self->{mac}, $client_ip, $gateway_ip,
$client_ident, $requested_ip, $hostname, $dhcp_vendor_class, $dhcp_user_class, $self->{dhcp_opt82_chasis_id},
$self->{dhcp_opt82_unit_id}, $self->{dhcp_opt82_port_id}, $self->{dhcp_opt82_vlan_id}, $self->{dhcp_opt82_subscriber_id}));
$sth->execute();
$sth->finish();
}
# lease functions
# add lease by ip&mac (return -1,0,1)
sub add_lease {
# my ($self) = shift;
# my ($ip) = $_[0];
my ($self) = shift;
my ($result) = 0;
$self->logger(9, "Function: " . (caller(0))[3]);
$self->logger(3, sprintf("LEASE: Try to add lease for IP = %s and MAC = %s", $_[0], $self->{mac}));
$result = $self->db_add_lease($_[0]) if ($self->check_lease($_[0]) == 0);
if ($result == 1) {
$self->logger(0, sprintf("LEASE: Added lease time %s for IP = %s and MAC = %s", $self->get_lease_time($_[0]), $_[0], $self->{mac}));
}
else {
$self->logger(0, sprintf("LEASE: Not added lease for IP = %s and MAC = %s", $_[0], $self->{mac}));
}
return ($result);
}
sub db_add_lease {
# my ($self) = shift;
# my ($ip) = $_[0];
my ($self) = shift;
$self->logger(3, sprintf("SQL: Try to add lease for IP = %s and MAC = %s", $_[0], $self->{mac}));
$self->logger(3, sprintf("SQL: $self->{lease_add}", $self->{mac}, $_[0]));
my $sth = $self->{dbh}->prepare(sprintf($self->{lease_add}, $self->{mac}, $_[0]));
$sth->execute();
my $result = $sth->rows();