Bagaimana cara saya menunjukkan sewa dhcp aktif

Tidak berpengalaman dengan Ubuntu. Menyiapkan server dhcp sekitar setahun yang lalu tetapi tidak ingat perintah untuk melihat sewa aktif.

Coba periksa file sewa /var/lib/dhcp/dhcpd.leases

Organisasi kami menggunakan skrip Python, seperti yang diposting di bawah ini, untuk memeriksa /var/lib/dhcp/dhcpd.leasesfile:

#!/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('+------------------------------------------------------------------------------')

Jika Anda menggunakan NetworkManager (yang merupakan default di banyak distribusi) .leasefile berada di/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

Berikut ini perintah hebat menggunakan CLI - Anda dapat pergi ke direktori tempat dhcpd.logfile berada dan lakukan:

tail -f dhcpd.log

Itu akan menunjukkan Anda sewa karena mereka dikeluarkan oleh server secara real time.

Anda juga dapat melakukan:

cat /var/lib/dhcpd/dhcpd.leases untuk melihat sewa yang ada di file sewa dhcpd.leases

Saya menggunakan skrip ini:

#!/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 $ip;
    ($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;
}

Anda mungkin ingin menyesuaikannya sesuai dengan kebutuhan Anda.

Ada juga modul Perl yang mungkin ingin Anda coba jika Anda memiliki gagasan yang kabur tentang Perl: Net :: ISC :: DHCPd :: Sewa , POE :: Filter :: DHCPd :: Sewa atau Teks :: DHCPLease .

Yang terakhir dapat diinstal dengan

sudo apt-get install libtext-dhcpleases-perl

Yang lain dengan cpan -i.

Sayangnya, saya belum mencoba salah satu dari mereka, karena saya sudah memiliki skrip ketika saya perhatikan.

Jika Anda menginginkan sesuatu dalam GUI, lihatlah Glass . Ini berjalan sebagai aplikasi web, dan menyediakan akses ke file konfigurasi DHCPd Anda, serta sewa. Ini menggunakan grafik dan statistik, yang berguna jika Anda memiliki beberapa subnet atau kumpulan.

Saya juga suka itu mengingatkan saya jika aktivitas tampak tidak aktif - perangkat tidak mendapatkan alamat secara massal, atau terlalu banyak permintaan dari klien tunggal. Saya sudah menggunakannya selama sebulan sekarang, dan saya menyukainya.