diff options
Diffstat (limited to 'src/op_mode/show_dhcp.py')
| -rwxr-xr-x | src/op_mode/show_dhcp.py | 140 |
1 files changed, 109 insertions, 31 deletions
diff --git a/src/op_mode/show_dhcp.py b/src/op_mode/show_dhcp.py index 4c4ee6355..c2a05f516 100755 --- a/src/op_mode/show_dhcp.py +++ b/src/op_mode/show_dhcp.py @@ -20,6 +20,9 @@ import argparse import ipaddress import tabulate import sys +import collections +import os +from datetime import datetime from vyos.config import Config from isc_dhcp_leases import Lease, IscDhcpLeases @@ -27,6 +30,18 @@ from isc_dhcp_leases import Lease, IscDhcpLeases lease_file = "/config/dhcpd.leases" pool_key = "shared-networkname" +lease_display_fields = collections.OrderedDict() +lease_display_fields['ip'] = 'IP address' +lease_display_fields['hardware_address'] = 'Hardware address' +lease_display_fields['state'] = 'State' +lease_display_fields['start'] = 'Lease start' +lease_display_fields['end'] = 'Lease expiration' +lease_display_fields['remaining'] = 'Remaining' +lease_display_fields['pool'] = 'Pool' +lease_display_fields['hostname'] = 'Hostname' + +lease_valid_states = ['all', 'active', 'free', 'expired', 'released', 'abandoned', 'reset', 'backup'] + def in_pool(lease, pool): if pool_key in lease.sets: if lease.sets[pool_key] == pool: @@ -34,17 +49,47 @@ def in_pool(lease, pool): return False +def utc_to_local(utc_dt): + return datetime.fromtimestamp((utc_dt - datetime(1970,1,1)).total_seconds()) + def get_lease_data(lease): data = {} - # End time may not be present in backup leases + # isc-dhcp lease times are in UTC so we need to convert them to local time to display + try: + data["start"] = utc_to_local(lease.start).strftime("%Y/%m/%d %H:%M:%S") + except: + data["start"] = "" + + try: + data["end"] = utc_to_local(lease.end).strftime("%Y/%m/%d %H:%M:%S") + except: + data["end"] = "" + try: - data["expires"] = lease.end.strftime("%Y/%m/%d %H:%M:%S") + data["remaining"] = lease.end - datetime.utcnow() + # negative timedelta prints wrong so bypass it + if (data["remaining"].days >= 0): + # substraction gives us a timedelta object which can't be formatted with strftime + # so we use str(), split gets rid of the microseconds + data["remaining"] = str(data["remaining"]).split('.')[0] + else: + data["remaining"] = "" except: - data["expires"] = "" + data["remaining"] = "" + + # currently not used but might come in handy + # todo: parse into datetime string + for prop in ['tstp', 'tsfp', 'atsfp', 'cltt']: + if prop in lease.data: + data[prop] = lease.data[prop] + else: + data[prop] = '' data["hardware_address"] = lease.ethernet data["hostname"] = lease.hostname + + data["state"] = lease.binding_state data["ip"] = lease.ip try: @@ -54,26 +99,54 @@ def get_lease_data(lease): return data -def get_leases(leases, state=None, pool=None): +def get_leases(leases, state, pool=None, sort='ip'): + # get leases from file leases = IscDhcpLeases(lease_file).get() - if state is not None: - leases = list(filter(lambda x: x.binding_state == 'active', leases)) + # filter leases by state + if 'all' not in state: + leases = list(filter(lambda x: x.binding_state in state, leases)) + # filter leases by pool name if pool is not None: - leases = list(filter(lambda x: in_pool(x, pool), leases)) + if config.exists_effective("service dhcp-server shared-network-name {0}".format(pool)): + leases = list(filter(lambda x: in_pool(x, pool), leases)) + else: + print("Pool {0} does not exist.".format(pool)) + sys.exit(0) - return list(map(get_lease_data, leases)) + # should maybe filter all state=active by lease.valid here? -def show_leases(leases): - headers = ["IP address", "Hardware address", "Lease expiration", "Pool", "Client Name"] + # sort by start time to dedupe (newest lease overrides older) + leases = sorted(leases, key = lambda lease: lease.start) + + # dedupe by converting to dict + leases_dict = {} + for lease in leases: + # dedupe by IP + leases_dict[lease.ip] = lease + # convert the lease data + leases = list(map(get_lease_data, leases_dict.values())) + + # apply output/display sort + if sort == 'ip': + leases = sorted(leases, key = lambda lease: int(ipaddress.ip_address(lease['ip']))) + else: + leases = sorted(leases, key = lambda lease: lease[sort]) + + return leases + +def show_leases(leases): lease_list = [] for l in leases: - lease_list.append([l["ip"], l["hardware_address"], l["expires"], l["pool"], l["hostname"]]) + lease_list_params = [] + for k in lease_display_fields.keys(): + lease_list_params.append(l[k]) + lease_list.append(lease_list_params) + + output = tabulate.tabulate(lease_list, lease_display_fields.values()) - output = tabulate.tabulate(lease_list, headers) - print(output) def get_pool_size(config, pool): @@ -85,7 +158,7 @@ def get_pool_size(config, pool): start = config.return_effective_value("service dhcp-server shared-network-name {0} subnet {1} range {2} start".format(pool, s, r)) stop = config.return_effective_value("service dhcp-server shared-network-name {0} subnet {1} range {2} stop".format(pool, s, r)) - size += int(ipaddress.IPv4Address(stop)) - int(ipaddress.IPv4Address(start)) + size += int(ipaddress.ip_address(stop)) - int(ipaddress.ip_address(start)) return size @@ -101,35 +174,33 @@ if __name__ == '__main__': group = parser.add_mutually_exclusive_group() group.add_argument("-l", "--leases", action="store_true", help="Show DHCP leases") group.add_argument("-s", "--statistics", action="store_true", help="Show DHCP statistics") + group.add_argument("--allowed", type=str, choices=["pool", "sort", "state"], help="Show allowed values for argument") - parser.add_argument("-e", "--expired", action="store_true", help="Show expired leases") - parser.add_argument("-p", "--pool", type=str, action="store", help="Show lease for specific pool") - parser.add_argument("-j", "--json", action="store_true", default=False, help="Product JSON output") + parser.add_argument("-p", "--pool", type=str, help="Show lease for specific pool") + parser.add_argument("-S", "--sort", type=str, choices=lease_display_fields.keys(), default='ip', help="Sort by") + parser.add_argument("-t", "--state", type=str, nargs="+", choices=lease_valid_states, default="active", help="Lease state to show (can specify multiple with spaces)") + parser.add_argument("-j", "--json", action="store_true", default=False, help="Produce JSON output") args = parser.parse_args() # Do nothing if service is not configured config = Config() if not config.exists_effective('service dhcp-server'): - print("DHCP service is not configured") + print("DHCP service is not configured.") sys.exit(0) + # if dhcp server is down, inactive leases may still be shown as active, so warn the user. + if os.system('systemctl -q is-active isc-dhcp-server.service') != 0: + print("WARNING: DHCP server is configured but not started. Data may be stale.") + if args.leases: - if args.expired: - if args.pool: - leases = get_leases(lease_file, state='free', pool=args.pool) - else: - leases = get_leases(lease_file, state='free') - else: - if args.pool: - leases = get_leases(lease_file, state='active', pool=args.pool) - else: - leases = get_leases(lease_file, state='active') + leases = get_leases(lease_file, args.state, args.pool, args.sort) if args.json: print(json.dumps(leases, indent=4)) else: show_leases(leases) + elif args.statistics: pools = [] @@ -143,10 +214,10 @@ if __name__ == '__main__': stats = [] for p in pools: size = get_pool_size(config, p) - leases = len(get_leases(lease_file, state='active', pool=args.pool)) + leases = len(get_leases(lease_file, state='active', pool=p)) if size != 0: - use_percentage = round(leases / size) * 100 + use_percentage = round(leases / size * 100) else: use_percentage = 0 @@ -163,5 +234,12 @@ if __name__ == '__main__': print(json.dumps(stats, indent=4)) else: show_pool_stats(stats) + + elif args.allowed == 'pool': + print(' '.join(config.list_effective_nodes("service dhcp-server shared-network-name"))) + elif args.allowed == 'sort': + print(' '.join(lease_display_fields.keys())) + elif args.allowed == 'state': + print(' '.join(lease_valid_states)) else: - print("Use either --leases or --statistics option") + parser.print_help() |