---uncomplete--- new version of gosa-si-client POE based

git-svn-id: https://oss.gonicus.de/repositories/gosa/trunk@8711 594d385d-05f5-0310-b6e9-bd551577e9d8

diff --git a/gosa-si/new-gosa-si-client b/gosa-si/new-gosa-si-client
new file mode 100755 (executable)
index 0000000..8ad3f26
--- /dev/null
+++ b/gosa-si/new-gosa-si-client
@@ -0,0 +1,924 @@
+#!/usr/bin/perl
+#===============================================================================
+#
+#         FILE:  gosa-server
+#
+#        USAGE:  gosa-si-client
+#
+#  DESCRIPTION:
+#
+#      OPTIONS:  ---
+# REQUIREMENTS:  libnetaddr-ip-perl
+#         BUGS:  ---
+#        NOTES:
+#       AUTHOR:   (Andreas Rettenberger), <rettenberger@gonicus.de>
+#      COMPANY:
+#      VERSION:  1.0
+#      CREATED:  12.09.2007 08:54:41 CEST
+#     REVISION:  ---
+#===============================================================================
+
+use strict;
+use warnings;
+use Getopt::Long;
+use Config::IniFiles;
+use POSIX;
+
+use POE qw(Component::Server::TCP);
+use IO::Socket::INET;
+use NetAddr::IP;
+use Data::Dumper;
+use Crypt::Rijndael;
+use GOSA::GosaSupportDaemon;
+use Digest::MD5  qw(md5_hex);
+use MIME::Base64;
+use XML::Simple;
+#use Fcntl;
+#use Sys::Syslog qw( :DEFAULT setlogsock);
+#use File::Spec;
+#use Cwd;
+
+my $event_dir = "/usr/lib/gosa-si/client/events";
+use lib "/usr/lib/gosa-si/client/events";
+
+
+
+my ($cfg_file, %cfg_defaults, $foreground, $verbose, $pid_file, $procid, $pid, $log_file);
+my ($server_ip, $server_port, $server_key, $server_timeout, $server_domain);
+my ($client_ip, $client_port, $ldap_enabled, $ldap_config, $pam_config, $nss_config);
+
+# default variables
+my $server_address;
+my @servers;
+my $client_address;
+my $client_mac_address;
+my $xml;
+my $default_server_key;
+my $event_hash;
+
+%cfg_defaults = (
+"general" =>
+    {"log_file" => [\$log_file, "/var/run/".$0.".log"],
+    "pid_file" => [\$pid_file, "/var/run/".$0.".pid"],
+    },
+"client" => 
+    {"client_port" => [\$client_port, "20083"],
+     "client_ip" => [\$client_ip, "0.0.0.0"],
+     "ldap" => [\$ldap_enabled, 1],
+     "ldap_config" => [\$ldap_config, "/etc/ldap/ldap.conf"],
+     "pam_config" => [\$pam_config, "/etc/pam_ldap.conf"],
+     "nss_config" => [\$nss_config, "/etc/libnss_ldap.conf"],
+    },
+"server" =>
+    {"server_ip" => [\$server_ip, "127.0.0.1"],
+    "server_port" => [\$server_port, "20081"],
+    "server_key" => [\$server_key, ""],
+    "server_timeout" => [\$server_timeout, 10],
+    "server_domain" => [\$server_domain, ""],
+    },
+
+);
+
+
+#=== FUNCTIONS = functions =====================================================
+
+#===  FUNCTION  ================================================================
+#         NAME: check_cmdline_param
+#   PARAMETERS: 
+#      RETURNS:  
+#  DESCRIPTION: 
+#===============================================================================
+sub check_cmdline_param () {
+    my $err_config;
+    my $err_counter = 0;
+       if(not defined($cfg_file)) {
+               $cfg_file = "/etc/gosa-si/client.conf";
+               if(! -r $cfg_file) {
+                       $err_config = "please specify a config file";
+                       $err_counter += 1;
+               }
+    }
+    if( $err_counter > 0 ) {
+        &usage( "", 1 );
+        if( defined( $err_config)) { print STDERR "$err_config\n"}
+        print STDERR "\n";
+        exit( -1 );
+    }
+}
+
+
+#===  FUNCTION  ================================================================
+#         NAME:  read_configfile
+#   PARAMETERS:  cfg_file - string - 
+#      RETURNS:  
+#  DESCRIPTION: 
+#===============================================================================
+sub read_configfile {
+    my $cfg;
+    if( defined( $cfg_file) && ( length($cfg_file) > 0 )) {
+        if( -r $cfg_file ) {
+            $cfg = Config::IniFiles->new( -file => $cfg_file );
+        } else {
+            print STDERR "Couldn't read config file!";
+        }
+    } else {
+        $cfg = Config::IniFiles->new() ;
+    }
+    foreach my $section (keys %cfg_defaults) {
+        foreach my $param (keys %{$cfg_defaults{ $section }}) {
+            my $pinfo = $cfg_defaults{ $section }{ $param };
+            ${@$pinfo[ 0 ]} = $cfg->val( $section, $param, @$pinfo[ 1 ] );
+        }
+    }
+}
+
+
+#===  FUNCTION  ================================================================
+#         NAME: check_pid
+#   PARAMETERS:
+#      RETURNS:
+#  DESCRIPTION:
+#===============================================================================
+sub check_pid {
+    $pid = -1;
+    # Check, if we are already running
+    if( open(LOCK_FILE, "<$pid_file") ) {
+        $pid = <LOCK_FILE>;
+        if( defined $pid ) {
+            chomp( $pid );
+            if( -f "/proc/$pid/stat" ) {
+                my($stat) = `cat /proc/$pid/stat` =~ m/$pid \((.+)\).*/;
+                if( $0 eq $stat ) {
+                    close( LOCK_FILE );
+                    exit -1;
+                }
+            }
+        }
+        close( LOCK_FILE );
+        unlink( $pid_file );
+    }
+
+    # create a syslog msg if it is not to possible to open PID file
+    if (not sysopen(LOCK_FILE, $pid_file, O_WRONLY|O_CREAT|O_EXCL, 0644)) {
+        my($msg) = "Couldn't obtain lockfile '$pid_file' ";
+        if (open(LOCK_FILE, '<', $pid_file)
+                && ($pid = <LOCK_FILE>))
+        {
+            chomp($pid);
+            $msg .= "(PID $pid)\n";
+        } else {
+            $msg .= "(unable to read PID)\n";
+        }
+        if( ! ($foreground) ) {
+            openlog( $0, "cons,pid", "daemon" );
+            syslog( "warning", $msg );
+            closelog();
+        }
+        else {
+            print( STDERR " $msg " );
+        }
+        exit( -1 );
+    }
+}
+
+
+#===  FUNCTION  ================================================================
+#         NAME:  logging
+#   PARAMETERS:  level - string - default 'info' 
+#                msg - string - 
+#                facility - string - default 'LOG_DAEMON' 
+#      RETURNS:  
+#  DESCRIPTION: 
+#===============================================================================
+sub daemon_log {
+    # log into log_file
+    my( $msg, $level ) = @_;
+    if(not defined $msg) { return }
+    if(not defined $level) { $level = 1 }
+    if(defined $log_file){
+        open(LOG_HANDLE, ">>$log_file");
+        if(not defined open( LOG_HANDLE, ">>$log_file" )) {
+            print STDERR "cannot open $log_file: $!";
+            return }
+            chomp($msg);
+            if($level <= $verbose){
+                my ($seconds, $minutes, $hours, $monthday, $month,
+                        $year, $weekday, $yearday, $sommertime) = localtime(time);
+                $hours = $hours < 10 ? $hours = "0".$hours : $hours;
+                $minutes = $minutes < 10 ? $minutes = "0".$minutes : $minutes;
+                $seconds = $seconds < 10 ? $seconds = "0".$seconds : $seconds;
+                my @monthnames = ("Jan", "Feb", "Mar", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec");
+                $month = $monthnames[$month];
+                $monthday = $monthday < 10 ? $monthday = "0".$monthday : $monthday;
+                $year+=1900;
+                my $name = $0;
+                $name =~ s/\.\///;
+
+                my $log_msg = "$month $monthday $hours:$minutes:$seconds $name $msg\n";
+                print LOG_HANDLE $log_msg;
+                if( $foreground ) { 
+                    print STDERR $log_msg;
+                }
+            }
+        close( LOG_HANDLE );
+    }
+#log into syslog
+#    my ($msg, $level, $facility) = @_;
+#    if(not defined $msg) {return}
+#    if(not defined $level) {$level = "info"}
+#    if(not defined $facility) {$facility = "LOG_DAEMON"}
+#    openlog($0, "pid,cons,", $facility);
+#    syslog($level, $msg);
+#    closelog;
+#    return;
+}
+
+
+#===  FUNCTION  ================================================================
+#         NAME:  get_interfaces 
+#   PARAMETERS:  none
+#      RETURNS:  (list of interfaces) 
+#  DESCRIPTION:  Uses proc fs (/proc/net/dev) to get list of interfaces.
+#===============================================================================
+sub get_interfaces {
+    my @result;
+    my $PROC_NET_DEV= ('/proc/net/dev');
+
+    open(PROC_NET_DEV, "<$PROC_NET_DEV")
+        or die "Could not open $PROC_NET_DEV";
+
+    my @ifs = <PROC_NET_DEV>;
+
+    close(PROC_NET_DEV);
+
+    # Eat first two line
+    shift @ifs;
+    shift @ifs;
+
+    chomp @ifs;
+    foreach my $line(@ifs) {
+        my $if= (split /:/, $line)[0];
+        $if =~ s/^\s+//;
+        push @result, $if;
+    }
+
+    return @result;
+}
+
+#===  FUNCTION  ================================================================
+#         NAME:  get_mac 
+#   PARAMETERS:  interface name (i.e. eth0)
+#      RETURNS:  (mac address) 
+#  DESCRIPTION:  Uses ioctl to get mac address directly from system.
+#===============================================================================
+sub get_mac {
+    my $ifreq= shift;
+    my $result;
+    if ($ifreq && length($ifreq) > 0) { 
+        if($ifreq eq "all") {
+            if(defined($server_ip)) {
+                $result = &get_local_mac_for_remote_ip($server_ip);
+            } else {
+                $result = "00:00:00:00:00:00";
+            }
+        } else {
+            my $SIOCGIFHWADDR= 0x8927;     # man 2 ioctl_list
+
+                # A configured MAC Address should always override a guessed value
+                if ($client_mac_address and length($client_mac_address) > 0) {
+                    $result= $client_mac_address;
+                }
+
+            socket SOCKET, PF_INET, SOCK_DGRAM, getprotobyname('ip')
+                or die "socket: $!";
+
+            if(ioctl SOCKET, $SIOCGIFHWADDR, $ifreq) {
+                my ($if, $mac)= unpack 'h36 H12', $ifreq;
+
+                if (length($mac) > 0) {
+                    $mac=~ m/^([0-9a-f][0-9a-f])([0-9a-f][0-9a-f])([0-9a-f][0-9a-f])([0-9a-f][0-9a-f])([0-9a-f][0-9a-f])([0-9a-f][0-9a-f])$/;
+                    $mac= sprintf("%s:%s:%s:%s:%s:%s", $1, $2, $3, $4, $5, $6);
+                    $result = $mac;
+                }
+            }
+        }
+    }
+    return $result;
+}
+
+
+#===  FUNCTION  ================================================================
+#         NAME:  get_interface_for_ip
+#   PARAMETERS:  ip address (i.e. 192.168.0.1)
+#      RETURNS:  array: list of interfaces if ip=0.0.0.0, matching interface if found, undef else
+#  DESCRIPTION:  Uses proc fs (/proc/net/dev) to get list of interfaces.
+#===============================================================================
+sub get_interface_for_ip {
+    my $result;
+    my $ip= shift;
+    if ($ip && length($ip) > 0) {
+        my @ifs= &get_interfaces();
+        if($ip eq "0.0.0.0") {
+            $result = "all";
+        } else {
+            foreach (@ifs) {
+                my $if=$_;
+                if(get_ip($if) eq $ip) {
+                    $result = $if;
+                    last;
+                }
+            }       
+        }
+    }       
+    return $result;
+}
+
+
+#===  FUNCTION  ================================================================
+#         NAME:  get_ip 
+#   PARAMETERS:  interface name (i.e. eth0)
+#      RETURNS:  (ip address) 
+#  DESCRIPTION:  Uses ioctl to get ip address directly from system.
+#===============================================================================
+sub get_ip {
+    my $ifreq= shift;
+    my $result= "";
+    my $SIOCGIFADDR= 0x8915;       # man 2 ioctl_list
+        my $proto= getprotobyname('ip');
+
+    socket SOCKET, PF_INET, SOCK_DGRAM, $proto
+        or die "socket: $!";
+
+    if(ioctl SOCKET, $SIOCGIFADDR, $ifreq) {
+        my ($if, $sin)    = unpack 'a16 a16', $ifreq;
+        my ($port, $addr) = sockaddr_in $sin;
+        my $ip            = inet_ntoa $addr;
+
+        if ($ip && length($ip) > 0) {
+            $result = $ip;
+        }
+    }
+
+    return $result;
+}
+
+
+#===  FUNCTION  ================================================================
+#         NAME:  get_local_mac_for_remote_ip
+#   PARAMETERS:  none (takes server_ip from global variable)
+#      RETURNS:  (ip address from interface that is used for communication) 
+#  DESCRIPTION:  Uses ioctl to get routing table from system, checks which entry
+#                matches (defaultroute last).
+#===============================================================================
+sub get_local_mac_for_remote_ip {
+    my $ifreq= shift;
+    my $result= "00:00:00:00:00:00";
+    my $PROC_NET_ROUTE= ('/proc/net/route');
+
+    open(PROC_NET_ROUTE, "<$PROC_NET_ROUTE")
+        or die "Could not open $PROC_NET_ROUTE";
+
+    my @ifs = <PROC_NET_ROUTE>;
+
+    close(PROC_NET_ROUTE);
+
+    # Eat header line
+    shift @ifs;
+    chomp @ifs;
+    foreach my $line(@ifs) {
+        my ($Iface,$Destination,$Gateway,$Flags,$RefCnt,$Use,$Metric,$Mask,$MTU,$Window,$IRTT)=split(/\s/, $line);
+        my $destination;
+        my $mask;
+        my ($d,$c,$b,$a)=unpack('a2 a2 a2 a2', $Destination);
+        $destination= sprintf("%d.%d.%d.%d", hex($a), hex($b), hex($c), hex($d));
+        ($d,$c,$b,$a)=unpack('a2 a2 a2 a2', $Mask);
+        $mask= sprintf("%d.%d.%d.%d", hex($a), hex($b), hex($c), hex($d));
+        if(new NetAddr::IP($server_ip)->within(new NetAddr::IP($destination, $mask))) {
+            # destination matches route, save mac and exit
+            $result= &get_mac($Iface);
+            last;
+        }
+    }
+
+
+    return $result;
+}
+
+
+sub create_passwd {
+    my $new_passwd = "";
+    for(my $i=0; $i<31; $i++) {
+        $new_passwd .= ("a".."z","A".."Z",0..9)[int(rand(62))]
+    }
+
+    return $new_passwd;
+}
+
+
+sub get_server_addresses {
+    my $domain= shift;
+    my @result;
+    my $dig_cmd= 'dig +nocomments srv _gosad._tcp.'.$domain;
+
+    my $output= `$dig_cmd 2>&1`;
+    open (PIPE, "$dig_cmd 2>&1 |");
+    while(<PIPE>) {
+        chomp $_;
+        # If it's not a comment
+        if($_ =~ m/^[^;]/) {
+            my @matches= split /\s+/;
+
+            # Push hostname with port
+            if($matches[3] eq 'SRV') {
+                push @result, $matches[7].':'.$matches[6];
+            } elsif ($matches[3] eq 'A') {
+                my $i=0;
+
+                # Substitute the hostname with the ip address of the matching A record
+                foreach my $host (@result) {
+                    if ((split /\:/, $host)[0] eq $matches[0]) {
+                        $result[$i]= $matches[4].':'.(split /\:/, $host)[1];
+                    }
+                    $i++;
+                }
+            }
+        }
+    }
+    close(PIPE);
+    return @result;
+}
+
+
+##===  FUNCTION  ================================================================
+##         NAME:  create_ciphering
+##   PARAMETERS:  passwd - string - used to create ciphering
+##      RETURNS:  cipher - object
+##  DESCRIPTION:  creates a Crypt::Rijndael::MODE_CBC object with passwd as key
+##===============================================================================
+#sub create_ciphering {
+#    my ($passwd) = @_;
+#    $passwd = substr(md5_hex("$passwd") x 32, 0, 32);
+#    my $iv = substr(md5_hex('GONICUS GmbH'),0, 16);
+#
+#    #daemon_log("iv: $iv", 7);
+#    #daemon_log("key: $passwd", 7);
+#    my $my_cipher = Crypt::Rijndael->new($passwd , Crypt::Rijndael::MODE_CBC());
+#    $my_cipher->set_iv($iv);
+#    return $my_cipher;
+#}
+#
+#
+#sub create_ciphering {
+#    my ($passwd) = @_;
+#    $passwd = substr(md5_hex("$passwd") x 32, 0, 32);
+#    my $iv = substr(md5_hex('GONICUS GmbH'),0, 16);
+#    my $my_cipher = Crypt::Rijndael->new($passwd , Crypt::Rijndael::MODE_CBC());
+#    $my_cipher->set_iv($iv);
+#    return $my_cipher;
+#}
+#
+#
+#sub encrypt_msg {
+#    my ($msg, $key) = @_;
+#    my $my_cipher = &create_ciphering($key);
+#    {
+#      use bytes;
+#      $msg = "\0"x(16-length($msg)%16).$msg;
+#    }
+#    $msg = $my_cipher->encrypt($msg);
+#    chomp($msg = &encode_base64($msg));
+#    # there are no newlines allowed inside msg
+#    $msg=~ s/\n//g;
+#    return $msg;
+#}
+#
+#
+#sub decrypt_msg {
+#    my ($msg, $key) = @_ ;
+#    $msg = &decode_base64($msg);
+#    my $my_cipher = &create_ciphering($key);
+#    $msg = $my_cipher->decrypt($msg); 
+#    $msg =~ s/\0*//g;
+#    return $msg;
+#}
+
+
+#===  FUNCTION  ================================================================
+#         NAME:  send_msg_hash2address
+#   PARAMETERS:  msg_hash - hash - xml_hash created with function create_xml_hash
+#                PeerAddr string - socket address to send msg
+#                PeerPort string - socket port, if not included in socket address
+#      RETURNS:  nothing
+#  DESCRIPTION:  ????
+#===============================================================================
+sub send_msg_hash2address {
+    my ($msg_hash, $address, $passwd) = @_ ;
+
+    # fetch header for logging
+    my $header = @{$msg_hash->{header}}[0];  
+
+    # generate xml string
+    my $msg_xml = &create_xml_string($msg_hash);
+    
+    # encrypt xml msg
+    my $crypted_msg = &encrypt_msg($msg_xml, $passwd);
+
+    # opensocket
+    my $socket = &open_socket($address);
+    if(not defined $socket){
+        daemon_log("cannot send '$header'-msg to $address , server not reachable", 5);
+        return 1;
+    }
+    
+    # send xml msg
+    print $socket $crypted_msg."\n";
+    
+    close $socket;
+
+    daemon_log("send '$header'-msg to $address", 1);
+    daemon_log("message:\n$msg_xml", 8);
+    return 0;
+}
+
+
+sub open_socket {
+    my ($PeerAddr, $PeerPort) = @_ ;
+    if(defined($PeerPort)){
+        $PeerAddr = $PeerAddr.":".$PeerPort;
+    }
+    my $socket;
+    $socket = new IO::Socket::INET(PeerAddr => $PeerAddr,
+            Porto => "tcp",
+            Type => SOCK_STREAM,
+            Timeout => 5,
+            );
+    if(not defined $socket) {
+        return;
+    }
+    &daemon_log("open_socket: $PeerAddr", 7);
+    return $socket;
+}
+
+
+#===  FUNCTION  ================================================================
+#         NAME:  register_at_server
+#   PARAMETERS:  
+#      RETURNS:  
+#  DESCRIPTION:  
+#===============================================================================
+sub register_at_gosa_si_server {
+
+    # create new passwd and ciphering object for client-server communication
+    $server_key = &create_passwd();
+
+#    # detect all client accepted events
+#    opendir(DIR, $event_dir) 
+#        or daemon_log("cannot find directory $event_dir!\ngosa-si-client starts without any accepting events!", 1);
+#    my $file_name;
+#    my @events_list = ();
+#    my $events;
+#    while(defined($file_name = readdir(DIR))){
+#        if ($file_name eq "." || $file_name eq "..") {
+#            next;
+#        }
+#        push(@events_list, $file_name);
+#    }
+#    if( 0 == @events_list ) {
+#        $events = "none";
+#    }
+#    else {  
+#        $events = join(",", @events_list);
+#    }
+#    daemon_log("events found for gosa-si-client: $events", 1);
+    my $events = join( ", ", keys %{$event_hash} );
+
+    
+    while(1) {
+
+        # fetch first gosa-si-server from @servers
+        my $server = shift(@servers);
+
+        if( !$server ) {
+            daemon_log("no gosa-si-server left in list of servers", 1);
+            exit(1)
+        }
+
+        # create registration msg
+        my $register_hash = &create_xml_hash("here_i_am", $client_address, $server);
+        &add_content2xml_hash($register_hash, "new_passwd", $server_key);
+        &add_content2xml_hash($register_hash, "mac_address", $client_mac_address);
+        &add_content2xml_hash($register_hash, "events", $events);
+
+        # send xml hash to server with general server passwd
+        my $res = &send_msg_hash2address($register_hash, $server, $default_server_key);
+        if( $res == 1 ) {
+            next;
+        }
+
+        last;
+    }
+    
+    
+
+#    my ($rout, $wout, $reg_server);
+#    foreach my $server (@servers) {
+#
+#        # create msg hash
+#        my $register_hash = &create_xml_hash("here_i_am", $client_address, $server);
+#        &add_content2xml_hash($register_hash, "new_passwd", $new_server_key);
+#        &add_content2xml_hash($register_hash, "mac_address", $client_mac_address);
+#        &add_content2xml_hash($register_hash, "events", $events);
+#
+#        # send xml hash to server with general server passwd
+#        my $answer = &send_msg_hash2address($register_hash, $server, $server_passwd);
+# 
+#        if ($answer != 0) { next; }
+#       
+#        # waiting for response
+#        daemon_log("waiting for response...\n", 5);
+#        my $nf = select($rout=$rbits, $wout=$wbits, undef, $server_timeout);
+#
+#        # something is coming in
+#        if(vec $rout, fileno $input_socket, 1) {
+#            my $crypted_msg;
+#            my $client = $input_socket->accept();
+#            my $other_end = getpeername($client);
+#            if(not defined $other_end) {
+#                daemon_log("client cannot be identified: $!\n");
+#            } else {
+#                my ($port, $iaddr) = unpack_sockaddr_in($other_end);
+#                my $actual_ip = inet_ntoa($iaddr);
+#                daemon_log("\naccept client from $actual_ip\n", 5);
+#                my $in_msg = &read_from_socket($client);
+#                if(defined $in_msg){
+#                    chomp($in_msg);
+#                    $crypted_msg = $in_msg;
+#                } else {
+#                    daemon_log("cannot read from $actual_ip\n", 5);
+#                }
+#            }
+#            close($client);
+#            
+#            # validate acknowledge msg from server
+#            $new_server_cipher = &create_ciphering($new_server_passwd);
+#            my $msg_hash;
+#            eval {
+#                my $decrypted_msg = &decrypt_msg($crypted_msg, $new_server_cipher);
+#                daemon_log("decrypted register msg: $decrypted_msg", 5);
+#                $msg_hash = $xml->XMLin($decrypted_msg, ForceArray=>1);
+#            };
+#            if($@) {
+#                daemon_log("ERROR: do not understand the incoming message:" , 5);  
+#                daemon_log("$@", 7); 
+#            } else {
+#                my $header = @{$msg_hash->{header}}[0];
+#                if($header eq "registered") {
+#                    $reg_server = $server;
+#                    last;
+#                } elsif($header eq "denied") {
+#                    my $reason = (&get_content_from_xml_hash($msg_hash, "denied"))[0];
+#                    daemon_log("registration at $server denied: $reason", 1);
+#                } else {
+#                    daemon_log("cannot register at $server", 1);
+#                }
+#            }
+#        }
+#        # if no answer arrive, try next server in list
+#
+#    }
+#    
+#    if(defined $reg_server) {
+#        daemon_log("registered at $reg_server", 1);
+#    } else {
+#        daemon_log("cannot register at any server", 1);
+#        daemon_log("exiting!!!", 1);
+#        exit(1);
+#    }
+#
+#    # update the global available variables
+#    $server_address = $reg_server;
+#    $server_passwd = $new_server_passwd;
+#    $server_cipher = $new_server_cipher;
+    return;
+}
+
+
+
+sub check_key_and_xml_validity {
+    my ($crypted_msg, $module_key) = @_;
+#print STDERR "crypted_msg:$crypted_msg\n";
+#print STDERR "modul_key:$module_key\n";
+
+    my $msg;
+    my $msg_hash;
+    eval{
+        $msg = &decrypt_msg($crypted_msg, $module_key);
+        &main::daemon_log("decrypted_msg: \n$msg", 8);
+
+        $msg_hash = $xml->XMLin($msg, ForceArray=>1);
+
+        # check header
+        my $header_l = $msg_hash->{'header'};
+        if( 1 != @{$header_l} ) {
+            die'header error';
+        }
+        my $header = @{$header_l}[0];
+        if( 0 == length $header) {
+            die 'header error';
+        }
+
+        # check source
+        my $source_l = $msg_hash->{'source'};
+        if( 1 != @{$source_l} ) {
+            die'source error';
+        }
+        my $source = @{$source_l}[0];
+        if( 0 == length $source) {
+            die 'source error';
+        }
+
+        # check target
+        my $target_l = $msg_hash->{'target'};
+        if( 1 != @{$target_l} ) {
+            die'target error';
+        }
+        my $target = @{$target_l}[0];
+        if( 0 == length $target) {
+            die 'target error';
+        }
+
+    };
+    if($@) {
+        &main::daemon_log("WARNING: do not understand the message:", 5);
+        &main::daemon_log("$@", 8);
+    }
+
+    return ($msg, $msg_hash);
+}
+
+
+sub import_events {
+    if (not -e $event_dir) {
+        daemon_log("ERROR: cannot find directory or directory is not readable: $event_dir", 1);   
+    }
+    opendir (DIR, $event_dir) or die "ERROR while loading gosa-si-events from directory $event_dir : $!\n";
+
+    while (defined (my $event = readdir (DIR))) {
+        if( $event eq "." || $event eq ".." ) { next; }    
+
+        eval{ require $event; };
+        if( $@ ) {
+            daemon_log("import of event module '$event' failed", 1);
+            daemon_log("$@", 8);
+            next;
+        }
+
+        $event =~ /(\S*?).pm$/;
+        my $event_module = $1;
+        my $events_l = eval( $1."::get_events()") ;
+        foreach my $event_name (@{$events_l}) {
+            print "$event_name\n";
+            $event_hash->{$event_name} = $event_module;
+        }
+
+    }
+}
+
+
+sub server_input {
+    my ($heap,$input,$wheel) = @_[HEAP, ARG0, ARG1];
+    my $error = 0;
+    
+    daemon_log("Incoming msg:\n$input\n", 8);
+
+    my ($msg, $msg_hash) = &check_key_and_xml_validity($input, $server_key);
+    if( (!$msg) || (!$msg_hash) ) {
+        daemon_log("Deciphering of incoming msg failed", 5);
+        $error++;
+    }
+
+    if( $error == 0 ) {
+        #print STDERR "msg:\n$msg\n";
+        #print STDERR Dumper($msg_hash);
+
+        my $header = @{$msg_hash->{header}}[0];
+        my $source = @{$msg_hash->{source}}[0];
+        if ($header eq 'new_ldap_config') { if ($ldap_enabled == 1) {&new_ldap_config($msg_hash)}}
+        elsif ($header eq 'ping') { &got_ping($msg_hash) }
+        elsif ($header eq 'wake_up') { &execute_event($msg_hash)}
+        elsif ($header eq 'new_passwd') { &new_passwd()}
+        elsif ($header eq 'compute_hardware') { &compute_hardware() }
+        elsif ($header eq 'registered') { daemon_log("gosa-si-client registerd at $source", 1) }
+        else { daemon_log("ERROR: no function assigned to msg $header", 5) }
+
+    }
+    return;
+}
+
+#==== MAIN = main ==============================================================
+#  parse commandline options
+Getopt::Long::Configure( "bundling" );
+GetOptions("h|help" => \&usage,
+           "c|config=s" => \$cfg_file,
+           "f|foreground" => \$foreground,
+           "v|verbose+" => \$verbose,
+           );
+
+#  read and set config parameters
+&check_cmdline_param ;
+&read_configfile;
+&check_pid;
+
+
+# forward error messages to logfile
+if ( ! $foreground ) {
+       open STDIN, '/dev/null' or die "Can’t read /dev/null: $!";
+       open STDOUT, '>>/dev/null' or die "Can't write to /dev/null: $!";
+       open STDERR, '>>/dev/null' or die "Can't write to /dev/null: $!";
+}
+
+# Just fork, if we are not in foreground mode
+if( ! $foreground ) { 
+    chdir '/'                 or die "Can't chdir to /: $!";
+    $pid = fork;
+    setsid                    or die "Can't start a new session: $!";
+    umask 0;
+} 
+else { 
+    $pid = $$; 
+}
+
+# Do something useful - put our PID into the pid_file
+if( 0 != $pid ) {
+    open( LOCK_FILE, ">$pid_file" );
+    print LOCK_FILE "$pid\n";
+    close( LOCK_FILE );
+    if( !$foreground ) { 
+        exit( 0 ) 
+    };
+}
+
+daemon_log(" ", 1);
+daemon_log("$0 started!", 1);
+
+# delete old DBsqlite lock files
+system('rm -f /tmp/gosa_si_lock*gosa-si-client*');
+
+
+# complete client_address
+$client_address = $client_ip.":".$client_port;
+
+
+# detect own ip and mac address
+my $network_interface= &get_interface_for_ip($client_ip);
+$client_mac_address= &get_mac($network_interface);
+daemon_log("gosa-si-client ip address detected: $client_ip", 1);
+daemon_log("gosa-si-client mac address detected: $client_mac_address", 1);
+
+
+# import events
+&import_events();
+#eval($event_hash->{'print_hello'}."::print_hello");
+
+
+# create socket for incoming xml messages
+POE::Component::Server::TCP->new(
+    Alias => 'gosa-si-client',
+       Port => $client_port,
+       ClientInput => \&server_input,
+);
+daemon_log("start socket for incoming xml messages at port '$client_port' ", 1);
+
+
+# prepare variables
+if (defined $server_ip && defined $server_port) {
+    $server_address = $server_ip.":".$server_port;
+}
+$xml = new XML::Simple();
+$default_server_key = $server_key;
+
+
+# find all possible gosa-si-servers in DNS
+if (defined $server_domain) {
+    my @tmp_servers = &get_server_addresses($server_domain);
+    foreach my $server (@tmp_servers) { 
+        unshift(@servers, $server); 
+    }
+}
+# add gosa-si-server address from config file at first position of server list
+if (defined $server_address) {
+    unshift(@servers, $server_address);
+}
+my $servers_string = join(", ", @servers);
+daemon_log("found servers in configuration file and via DNS: $servers_string", 5);
+
+
+POE::Session->create(
+       inline_states => {
+               _start => \&register_at_gosa_si_server ,
+       }
+);
+
+POE::Kernel->run();
+exit;
+