¿Cómo se muestran los arrendamientos de dhcp activos?

21

No experimentó con Ubuntu. Configure un servidor dhcp hace aproximadamente un año, pero no recuerde el comando para ver las concesiones activas.

    
pregunta keith 20.11.2012 - 04:36

5 respuestas

26

Pruebe comprobar el archivo de alquiler /var/lib/dhcp/dhcpd.leases

    
respondido por el Squall5668 20.11.2012 - 09:54
15

Nuestra organización utiliza una secuencia de comandos de Python, como se indica a continuación, para examinar el archivo /var/lib/dhcp/dhcpd.leases :

#!/usr/bin/python
import datetime, bisect

def parse_timestamp(raw_str):
        tokens = raw_str.split()

        if len(tokens) == 1:
                if tokens[0].lower() == 'never':
                        return 'never';

                else:
                        raise Exception('Parse error in timestamp')

        elif len(tokens) == 3:
                return datetime.datetime.strptime(' '.join(tokens[1:]),
                        '%Y/%m/%d %H:%M:%S')

        else:
                raise Exception('Parse error in timestamp')


def timestamp_is_ge(t1, t2):
        if t1 == 'never':
                return True

        elif t2 == 'never':
                return False

        else:
                return t1 >= t2


def timestamp_is_lt(t1, t2):
        if t1 == 'never':
                return False

        elif t2 == 'never':
                return t1 != 'never'

        else:
                return t1 < t2


def timestamp_is_between(t, tstart, tend):
        return timestamp_is_ge(t, tstart) and timestamp_is_lt(t, tend)


def parse_hardware(raw_str):
        tokens = raw_str.split()

        if len(tokens) == 2:
                return tokens[1]

        else:
                raise Exception('Parse error in hardware')


def strip_endquotes(raw_str):
        return raw_str.strip('"')


def identity(raw_str):
        return raw_str


def parse_binding_state(raw_str):
        tokens = raw_str.split()

        if len(tokens) == 2:
                return tokens[1]

        else:
                raise Exception('Parse error in binding state')


def parse_next_binding_state(raw_str):
        tokens = raw_str.split()

        if len(tokens) == 3:
                return tokens[2]

        else:
                raise Exception('Parse error in next binding state')


def parse_rewind_binding_state(raw_str):
        tokens = raw_str.split()

        if len(tokens) == 3:
                return tokens[2]

        else:
                raise Exception('Parse error in next binding state')


def parse_leases_file(leases_file):
        valid_keys = {
                'starts':               parse_timestamp,
                'ends':                 parse_timestamp,
                'tstp':                 parse_timestamp,
                'tsfp':                 parse_timestamp,
                'atsfp':                parse_timestamp,
                'cltt':                 parse_timestamp,
                'hardware':             parse_hardware,
                'binding':              parse_binding_state,
                'next':                 parse_next_binding_state,
                'rewind':               parse_rewind_binding_state,
                'uid':                  strip_endquotes,
                'client-hostname':      strip_endquotes,
                'option':               identity,
                'set':                  identity,
                'on':                   identity,
                'abandoned':            None,
                'bootp':                None,
                'reserved':             None,
                }

        leases_db = {}

        lease_rec = {}
        in_lease = False
        in_failover = False

        for line in leases_file:
                if line.lstrip().startswith('#'):
                        continue

                tokens = line.split()

                if len(tokens) == 0:
                        continue

                key = tokens[0].lower()

                if key == 'lease':
                        if not in_lease:
                                ip_address = tokens[1]

                                lease_rec = {'ip_address' : ip_address}
                                in_lease = True

                        else:
                                raise Exception('Parse error in leases file')

                elif key == 'failover':
                        in_failover = True
                elif key == '}':
                        if in_lease:
                                for k in valid_keys:
                                        if callable(valid_keys[k]):
                                                lease_rec[k] = lease_rec.get(k, '')
                                        else:
                                                lease_rec[k] = False

                                ip_address = lease_rec['ip_address']

                                if ip_address in leases_db:
                                        leases_db[ip_address].insert(0, lease_rec)

                                else:
                                        leases_db[ip_address] = [lease_rec]

                                lease_rec = {}
                                in_lease = False

                        elif in_failover:
                                in_failover = False
                                continue
                        else:
                                raise Exception('Parse error in leases file')

                elif key in valid_keys:
                        if in_lease:
                                value = line[(line.index(key) + len(key)):]
                                value = value.strip().rstrip(';').rstrip()

                                if callable(valid_keys[key]):
                                        lease_rec[key] = valid_keys[key](value)
                                else:
                                        lease_rec[key] = True

                        else:
                                raise Exception('Parse error in leases file')

                else:
                        if in_lease:
                                raise Exception('Parse error in leases file')

        if in_lease:
                raise Exception('Parse error in leases file')

        return leases_db


def round_timedelta(tdelta):
        return datetime.timedelta(tdelta.days,
                tdelta.seconds + (0 if tdelta.microseconds < 500000 else 1))


def timestamp_now():
        n = datetime.datetime.utcnow()
        return datetime.datetime(n.year, n.month, n.day, n.hour, n.minute,
                n.second + (0 if n.microsecond < 500000 else 1))


def lease_is_active(lease_rec, as_of_ts):
        return timestamp_is_between(as_of_ts, lease_rec['starts'],
                lease_rec['ends'])


def ipv4_to_int(ipv4_addr):
        parts = ipv4_addr.split('.')
        return (int(parts[0]) << 24) + (int(parts[1]) << 16) + \
                (int(parts[2]) << 8) + int(parts[3])


def select_active_leases(leases_db, as_of_ts):
        retarray = []
        sortedarray = []

        for ip_address in leases_db:
                lease_rec = leases_db[ip_address][0]

                if lease_is_active(lease_rec, as_of_ts):
                        ip_as_int = ipv4_to_int(ip_address)
                        insertpos = bisect.bisect(sortedarray, ip_as_int)
                        sortedarray.insert(insertpos, ip_as_int)
                        retarray.insert(insertpos, lease_rec)

        return retarray


##############################################################################


myfile = open('/var/lib/dhcp/dhcpd.leases', 'r')
leases = parse_leases_file(myfile)
myfile.close()

now = timestamp_now()
report_dataset = select_active_leases(leases, now)

print('+------------------------------------------------------------------------------')
print('| DHCPD ACTIVE LEASES REPORT')
print('+-----------------+-------------------+----------------------+-----------------')
print('| IP Address      | MAC Address       | Expires (days,H:M:S) | Client Hostname ')
print('+-----------------+-------------------+----------------------+-----------------')

for lease in report_dataset:
        print('| ' + format(lease['ip_address'], '<15') + ' | ' + \
                format(lease['hardware'], '<17') + ' | ' + \
                format(str((lease['ends'] - now) if lease['ends'] != 'never' else 'never'), '>20') + ' | ' + \
                lease['client-hostname'])

print('+-----------------+-------------------+----------------------+-----------------')
print('| Total Active Leases: ' + str(len(report_dataset)))
print('| Report generated (UTC): ' + str(now))
print('+------------------------------------------------------------------------------')
    
respondido por el Canadian Luke 24.11.2014 - 23:59
5

Si está utilizando NetworkManager (que es el predeterminado en muchas distribuciones), los archivos .lease se encuentran en /var/lib/NetworkManager

$ sudo ls -al /var/lib/NetworkManager/*.lease
-rw-r--r-- 1 root root 399 Jun 12 10:23 /var/lib/NetworkManager/dhclient-6aef9d76-0f6a-46e3-8235-a4405a695b1a-eth0.lease
-rw-r--r-- 1 root root 856 Jun 12 10:30 /var/lib/NetworkManager/dhclient-86e97e19-0a11-4606-8edf-5a179ec6f82e-eth0.lease
-rw-r--r-- 1 root root 800 Jun 12 10:30 /var/lib/NetworkManager/dhclient-d0f4b29f-3059-4f55-a8d2-34db34310384-wlan0.lease
    
respondido por el Taha Jahangir 12.06.2016 - 06:22
3

Este es un gran comando que usa CLI: puede ir al directorio donde se encuentra dhcpd.log file y hacer:

tail -f dhcpd.log

Eso le mostrará los arrendamientos, ya que el servidor los está emitiendo en tiempo real.

También puedes hacer:

cat /var/lib/dhcpd/dhcpd.leases para ver las concesiones que están en el archivo de arrendamiento dhcpd.leases

    
respondido por el P. Scott 04.06.2014 - 18:56
3

Utilizo este script:

#!/usr/bin/perl

my $VERSION=0.03;

my $leases_file = "/var/lib/dhcp/dhcpd.leases";

use strict;
use Date::Parse;

my $now = time;
my %seen;       # leases file has dupes (because logging failover stuff?). This hash will get rid of them.


open(L, $leases_file) or die "Cant open $leases_file : $!\n";
undef $/;
my @records = split /^lease\s+([\d\.]+)\s*\{/m, <L>;
shift @records; # remove stuff before first "lease" block

## process 2 array elements at a time: ip and data
foreach my $i (0 .. $#records) {
    next if $i % 2;
    my ($ip, $_) = @records[$i, $i+1];

    s/^\n+//;     # && warn "leading spaces removed\n";
    s/[\s\}]+$//; # && warn "trailing junk removed\n";

    my ($s) = /^\s* starts \s+ \d+ \s+ (.*?);/xm;
    my ($e) = /^\s* ends   \s+ \d+ \s+ (.*?);/xm;

    my $start = str2time($s);
    my $end   = str2time($e);

    my %h; # to hold values we want

    foreach my $rx ('binding', 'hardware', 'client-hostname') {
        my ($val) = /^\s*$rx.*?(\S+);/sm;
        $h{$rx} = $val;
    }

    my $formatted_output;

    if ($end && $end < $now) {
        $formatted_output =
            sprintf "%-15s : %-26s "              . "%19s "         . "%9s "     . "%24s    "              . "%24s\n",
                    $ip,     $h{'client-hostname'}, ""              , $h{binding}, "expired"               , scalar(localtime $end);
    }
    else {
        $formatted_output =
            sprintf "%-15s : %-26s "              . "%19s "         . "%9s "     . "%24s -- "              . "%24s\n",
                    $ip,     $h{'client-hostname'}, "($h{hardware})", $h{binding}, scalar(localtime $start), scalar(localtime $end);
    }

    next if $seen{$formatted_output};
    $seen{$formatted_output}++;
    print $formatted_output;
}

Es posible que desee adaptarlo a sus necesidades.

También hay módulos de Perl que puede probar si tiene una noción vaga de Perl: Net::ISC::DHCPd::Leases , POE :: Filter :: DHCPd :: Lease o Text::DHCPLeases .

El último se puede instalar con

sudo apt-get install libtext-dhcpleases-perl

Los otros con cpan -i .

Desafortunadamente, no he probado ninguno de ellos, porque ya tenía mi guión cuando los noté.

    
respondido por el mivk 10.12.2014 - 15:10

Lea otras preguntas en las etiquetas