summaryrefslogtreecommitdiff
path: root/src/dhcp-manager/nm-dhcp-systemd.c
blob: 534b54f25ba15c041b7d3e70b45dbc1622d476d3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
/* This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Copyright (C) 2014 Red Hat, Inc.
 */

#include "config.h"

#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <stdio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <net/if_arp.h>

#include "nm-default.h"
#include "nm-dhcp-systemd.h"
#include "nm-utils.h"
#include "nm-dhcp-utils.h"
#include "NetworkManagerUtils.h"
#include "nm-platform.h"

#include "sd-dhcp-client.h"
#include "sd-dhcp6-client.h"
#include "dhcp-protocol.h"
#include "dhcp-lease-internal.h"
#include "dhcp6-protocol.h"
#include "dhcp6-lease-internal.h"

G_DEFINE_TYPE (NMDhcpSystemd, nm_dhcp_systemd, NM_TYPE_DHCP_CLIENT)

#define NM_DHCP_SYSTEMD_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), NM_TYPE_DHCP_SYSTEMD, NMDhcpSystemdPrivate))

typedef struct {
	struct sd_dhcp_client *client4;
	struct sd_dhcp6_client *client6;
	char *lease_file;

	guint timeout_id;
	guint request_count;

	gboolean privacy;
} NMDhcpSystemdPrivate;

/************************************************************/

#define DHCP_OPTION_NIS_DOMAIN         40
#define DHCP_OPTION_NIS_SERVERS        41
#define DHCP_OPTION_DOMAIN_SEARCH     119
#define DHCP_OPTION_RFC3442_ROUTES    121
#define DHCP_OPTION_MS_ROUTES         249
#define DHCP_OPTION_WPAD              252

/* Internal values */
#define DHCP_OPTION_IP_ADDRESS       1024
#define DHCP_OPTION_EXPIRY           1025
#define DHCP6_OPTION_IP_ADDRESS      1026
#define DHCP6_OPTION_PREFIXLEN       1027
#define DHCP6_OPTION_PREFERRED_LIFE  1028
#define DHCP6_OPTION_MAX_LIFE        1029
#define DHCP6_OPTION_STARTS          1030
#define DHCP6_OPTION_LIFE_STARTS     1031
#define DHCP6_OPTION_RENEW           1032
#define DHCP6_OPTION_REBIND          1033
#define DHCP6_OPTION_IAID            1034

typedef struct {
	guint num;
	const char *name;
	gboolean include;
} ReqOption;

#define REQPREFIX "requested_"

static const ReqOption dhcp4_requests[] = {
	{ DHCP_OPTION_SUBNET_MASK,            REQPREFIX "subnet_mask",                     TRUE },
	{ DHCP_OPTION_TIME_OFFSET,            REQPREFIX "time_offset",                     TRUE },
	{ DHCP_OPTION_ROUTER,                 REQPREFIX "routers",                         TRUE },
	{ DHCP_OPTION_DOMAIN_NAME_SERVER,     REQPREFIX "domain_name_servers",             TRUE },
	{ DHCP_OPTION_HOST_NAME,              REQPREFIX "host_name",                       TRUE },
	{ DHCP_OPTION_DOMAIN_NAME,            REQPREFIX "domain_name",                     TRUE },
	{ DHCP_OPTION_INTERFACE_MTU,          REQPREFIX "interface_mtu",                   TRUE },
	{ DHCP_OPTION_BROADCAST,              REQPREFIX "broadcast_address",               TRUE },
	{ DHCP_OPTION_STATIC_ROUTE,           REQPREFIX "static_routes",                   TRUE },
	{ DHCP_OPTION_NIS_DOMAIN,             REQPREFIX "nis_domain",                      TRUE },
	{ DHCP_OPTION_NIS_SERVERS,            REQPREFIX "nis_servers",                     TRUE },
	{ DHCP_OPTION_NTP_SERVER,             REQPREFIX "ntp_servers",                     TRUE },
	{ DHCP_OPTION_SERVER_IDENTIFIER,      REQPREFIX "dhcp_server_identifier",          TRUE },
	{ DHCP_OPTION_DOMAIN_SEARCH,          REQPREFIX "domain_search",                   TRUE },
	{ DHCP_OPTION_CLASSLESS_STATIC_ROUTE, REQPREFIX "rfc3442_classless_static_routes", TRUE },
	{ DHCP_OPTION_MS_ROUTES,              REQPREFIX "ms_classless_static_routes",      TRUE },
	{ DHCP_OPTION_WPAD,                   REQPREFIX "wpad",                            TRUE },

	/* Internal values */
	{ DHCP_OPTION_IP_ADDRESS_LEASE_TIME, REQPREFIX "expiry",                          FALSE },
	{ DHCP_OPTION_CLIENT_IDENTIFIER,     REQPREFIX "dhcp_client_identifier",          FALSE },
	{ DHCP_OPTION_IP_ADDRESS,            REQPREFIX "ip_address",                      FALSE },
	{ 0, NULL, FALSE }
};

static const ReqOption dhcp6_requests[] = {
	{ DHCP6_OPTION_CLIENTID,       REQPREFIX "dhcp6_client_id",     TRUE },

	/* Don't request server ID by default; some servers don't reply to
	 * Information Requests that request the Server ID.
	 */
	{ DHCP6_OPTION_SERVERID,       REQPREFIX "dhcp6_server_id",     FALSE },

	{ DHCP6_OPTION_DNS_SERVERS,    REQPREFIX "dhcp6_name_servers",  TRUE },
	{ DHCP6_OPTION_DOMAIN_LIST,    REQPREFIX "dhcp6_domain_search", TRUE },
	{ DHCP6_OPTION_SNTP_SERVERS,   REQPREFIX "dhcp6_sntp_servers",  TRUE },

	/* Internal values */
	{ DHCP6_OPTION_IP_ADDRESS,     REQPREFIX "ip6_address",         FALSE },
	{ DHCP6_OPTION_PREFIXLEN,      REQPREFIX "ip6_prefixlen",       FALSE },
	{ DHCP6_OPTION_PREFERRED_LIFE, REQPREFIX "preferred_life",      FALSE },
	{ DHCP6_OPTION_MAX_LIFE,       REQPREFIX "max_life",            FALSE },
	{ DHCP6_OPTION_STARTS,         REQPREFIX "starts",              FALSE },
	{ DHCP6_OPTION_LIFE_STARTS,    REQPREFIX "life_starts",         FALSE },
	{ DHCP6_OPTION_RENEW,          REQPREFIX "renew",               FALSE },
	{ DHCP6_OPTION_REBIND,         REQPREFIX "rebind",              FALSE },
	{ DHCP6_OPTION_IAID,           REQPREFIX "iaid",                FALSE },
	{ 0, NULL, FALSE }
};

static void
take_option (GHashTable *options,
             const ReqOption *requests,
             guint option,
             char *value)
{
	guint i;

	g_return_if_fail (value != NULL);

	for (i = 0; requests[i].name; i++) {
		if (requests[i].num == option) {
			g_hash_table_insert (options,
			                     (gpointer) (requests[i].name + STRLEN (REQPREFIX)),
			                     value);
			break;
		}
	}
	/* Option should always be found */
	g_assert (requests[i].name);
}

static void
add_option (GHashTable *options, const ReqOption *requests, guint option, const char *value)
{
	if (options)
		take_option (options, requests, option, g_strdup (value));
}

static void
add_option_u32 (GHashTable *options, const ReqOption *requests, guint option, guint32 value)
{
	if (options)
		take_option (options, requests, option, g_strdup_printf ("%u", value));
}

static void
add_option_u64 (GHashTable *options, const ReqOption *requests, guint option, guint64 value)
{
	if (options)
		take_option (options, requests, option, g_strdup_printf ("%" G_GUINT64_FORMAT, value));
}

static void
add_requests_to_options (GHashTable *options, const ReqOption *requests)
{
	guint i;

	for (i = 0; options && requests[i].name; i++) {
		if (requests[i].include)
			g_hash_table_insert (options, (gpointer) requests[i].name, g_strdup ("1"));
	}
}

#define LOG_LEASE(domain, ...) \
G_STMT_START { \
	if (log_lease) { \
		nm_log (LOGL_INFO, (domain), __VA_ARGS__); \
	} \
} G_STMT_END

static NMIP4Config *
lease_to_ip4_config (const char *iface,
                     int ifindex,
                     sd_dhcp_lease *lease,
                     GHashTable *options,
                     guint32 default_priority,
                     gboolean log_lease,
                     GError **error)
{
	NMIP4Config *ip4_config = NULL;
	struct in_addr tmp_addr;
	const struct in_addr *addr_list;
	char buf[INET_ADDRSTRLEN];
	const char *str;
	guint32 lifetime = 0, i;
	NMPlatformIP4Address address;
	GString *l;
	struct sd_dhcp_route *routes;
	guint16 mtu;
	int r, num;
	guint64 end_time;
	const void *data;
	gsize data_len;
	gboolean metered = FALSE;

	g_return_val_if_fail (lease != NULL, NULL);

	ip4_config = nm_ip4_config_new (ifindex);

	/* Address */
	sd_dhcp_lease_get_address (lease, &tmp_addr);
	memset (&address, 0, sizeof (address));
	address.address = tmp_addr.s_addr;
	str = nm_utils_inet4_ntop (tmp_addr.s_addr, NULL);
	LOG_LEASE (LOGD_DHCP4, "  address %s", str);
	add_option (options, dhcp4_requests, DHCP_OPTION_IP_ADDRESS, str);

	/* Prefix/netmask */
	sd_dhcp_lease_get_netmask (lease, &tmp_addr);
	address.plen = nm_utils_ip4_netmask_to_prefix (tmp_addr.s_addr);
	LOG_LEASE (LOGD_DHCP4, "  plen %d", address.plen);
	add_option (options,
	            dhcp4_requests,
	            DHCP_OPTION_SUBNET_MASK,
	            nm_utils_inet4_ntop (tmp_addr.s_addr, NULL));

	/* Lease time */
	sd_dhcp_lease_get_lifetime (lease, &lifetime);
	address.timestamp = nm_utils_get_monotonic_timestamp_s ();
	address.lifetime = address.preferred = lifetime;
	end_time = (guint64) time (NULL) + lifetime;
	LOG_LEASE (LOGD_DHCP4, "  expires in %" G_GUINT32_FORMAT " seconds", lifetime);
	add_option_u64 (options,
	                dhcp4_requests,
	                DHCP_OPTION_IP_ADDRESS_LEASE_TIME,
	                end_time);

	address.source = NM_IP_CONFIG_SOURCE_DHCP;
	nm_ip4_config_add_address (ip4_config, &address);

	/* Gateway */
	r = sd_dhcp_lease_get_router (lease, &tmp_addr);
	if (r == 0) {
		nm_ip4_config_set_gateway (ip4_config, tmp_addr.s_addr);
		str = nm_utils_inet4_ntop (tmp_addr.s_addr, NULL);
		LOG_LEASE (LOGD_DHCP4, "  gateway %s", str);
		add_option (options, dhcp4_requests, DHCP_OPTION_ROUTER, str);
	}

	/* DNS Servers */
	num = sd_dhcp_lease_get_dns (lease, &addr_list);
	if (num > 0) {
		l = g_string_sized_new (30);
		for (i = 0; i < num; i++) {
			if (addr_list[i].s_addr) {
				nm_ip4_config_add_nameserver (ip4_config, addr_list[i].s_addr);
				str = nm_utils_inet4_ntop (addr_list[i].s_addr, NULL);
				LOG_LEASE (LOGD_DHCP4, "  nameserver '%s'", str);
				g_string_append_printf (l, "%s%s", l->len ? " " : "", str);
			}
		}
		if (l->len)
			add_option (options, dhcp4_requests, DHCP_OPTION_DOMAIN_NAME_SERVER, l->str);
		g_string_free (l, TRUE);
	}

	/* Domain Name */
	r = sd_dhcp_lease_get_domainname (lease, &str);
	if (r == 0) {
		/* Multiple domains sometimes stuffed into the option */
		char **domains = g_strsplit (str, " ", 0);
		char **s;

		for (s = domains; *s; s++) {
			LOG_LEASE (LOGD_DHCP4, "  domain name '%s'", *s);
			nm_ip4_config_add_domain (ip4_config, *s);
		}
		g_strfreev (domains);
		add_option (options, dhcp4_requests, DHCP_OPTION_DOMAIN_NAME, str);
	}

	/* Hostname */
	r = sd_dhcp_lease_get_hostname (lease, &str);
	if (r == 0) {
		LOG_LEASE (LOGD_DHCP4, "  hostname '%s'", str);
		add_option (options, dhcp4_requests, DHCP_OPTION_HOST_NAME, str);
	}

	/* Routes */
	num = sd_dhcp_lease_get_routes (lease, &routes);
	if (num > 0) {
		l = g_string_sized_new (30);
		for (i = 0; i < num; i++) {
			NMPlatformIP4Route route;
			const char *gw_str;

			memset (&route, 0, sizeof (route));
			route.network = routes[i].dst_addr.s_addr;
			route.plen = routes[i].dst_prefixlen;
			route.gateway = routes[i].gw_addr.s_addr;
			route.source = NM_IP_CONFIG_SOURCE_DHCP;
			route.metric = default_priority;
			nm_ip4_config_add_route (ip4_config, &route);

			str = nm_utils_inet4_ntop (route.network, buf);
			gw_str = nm_utils_inet4_ntop (route.gateway, NULL);
			LOG_LEASE (LOGD_DHCP4, "  static route %s/%d gw %s", str, route.plen, gw_str);

			g_string_append_printf (l, "%s%s/%d %s", l->len ? " " : "", str, route.plen, gw_str);
		}
		add_option (options, dhcp4_requests, DHCP_OPTION_RFC3442_ROUTES, l->str);
		g_string_free (l, TRUE);
	}

	/* MTU */
	r = sd_dhcp_lease_get_mtu (lease, &mtu);
	if (r == 0 && mtu) {
		nm_ip4_config_set_mtu (ip4_config, mtu, NM_IP_CONFIG_SOURCE_DHCP);
		add_option_u32 (options, dhcp4_requests, DHCP_OPTION_INTERFACE_MTU, mtu);
		LOG_LEASE (LOGD_DHCP4, "  mtu %u", mtu);
	}

	/* NTP servers */
	num = sd_dhcp_lease_get_ntp (lease, &addr_list);
	if (num > 0) {
		l = g_string_sized_new (30);
		for (i = 0; i < num; i++) {
			str = nm_utils_inet4_ntop (addr_list[i].s_addr, buf);
			LOG_LEASE (LOGD_DHCP4, "  ntp server '%s'", str);
			g_string_append_printf (l, "%s%s", l->len ? " " : "", str);
		}
		add_option (options, dhcp4_requests, DHCP_OPTION_NTP_SERVER, l->str);
		g_string_free (l, TRUE);
	}

	r = sd_dhcp_lease_get_vendor_specific (lease, &data, &data_len);
	if (r >= 0)
		metered = !!memmem (data, data_len, "ANDROID_METERED", STRLEN ("ANDROID_METERED"));
	nm_ip4_config_set_metered (ip4_config, metered);

	return ip4_config;
}

/************************************************************/

static char *
get_leasefile_path (const char *iface, const char *uuid, gboolean ipv6)
{
	return g_strdup_printf (NMSTATEDIR "/internal%s-%s-%s.lease",
	                        ipv6 ? "6" : "",
	                        uuid,
	                        iface);
}

static GSList *
nm_dhcp_systemd_get_lease_ip_configs (const char *iface,
                                      int ifindex,
                                      const char *uuid,
                                      gboolean ipv6,
                                      guint32 default_route_metric)
{
	GSList *leases = NULL;
	gs_free char *path = NULL;
	sd_dhcp_lease *lease = NULL;
	NMIP4Config *ip4_config;
	int r;

	if (ipv6)
		return NULL;

	path = get_leasefile_path (iface, uuid, FALSE);
	r = dhcp_lease_load (&lease, path);
	if (r == 0 && lease) {
		ip4_config = lease_to_ip4_config (iface, ifindex, lease, NULL, default_route_metric, FALSE, NULL);
		if (ip4_config)
			leases = g_slist_append (leases, ip4_config);
		sd_dhcp_lease_unref (lease);
	}

	return leases;
}

/************************************************************/

static void
_save_client_id (NMDhcpSystemd *self,
                 uint8_t type,
                 const uint8_t *client_id,
                 size_t len)
{
	gs_unref_bytes GBytes *b = NULL;
	gs_free char *buf = NULL;

	g_return_if_fail (self != NULL);
	g_return_if_fail (client_id != NULL);
	g_return_if_fail (len > 0);

	if (!nm_dhcp_client_get_client_id (NM_DHCP_CLIENT (self))) {
		buf = g_malloc (len + 1);
		buf[0] = type;
		memcpy (buf + 1, client_id, len);
		b = g_bytes_new (buf, len + 1);
		nm_dhcp_client_set_client_id (NM_DHCP_CLIENT (self), b);
	}
}

static void
bound4_handle (NMDhcpSystemd *self)
{
	NMDhcpSystemdPrivate *priv = NM_DHCP_SYSTEMD_GET_PRIVATE (self);
	const char *iface = nm_dhcp_client_get_iface (NM_DHCP_CLIENT (self));
	sd_dhcp_lease *lease;
	NMIP4Config *ip4_config;
	GHashTable *options;
	GError *error = NULL;
	int r;

	nm_log_dbg (LOGD_DHCP4, "(%s): lease available", iface);

	r = sd_dhcp_client_get_lease (priv->client4, &lease);
	if (r < 0 || !lease) {
		nm_log_warn (LOGD_DHCP4, "(%s): no lease!", iface);
		nm_dhcp_client_set_state (NM_DHCP_CLIENT (self), NM_DHCP_STATE_FAIL, NULL, NULL);
		return;
	}

	options = g_hash_table_new_full (g_str_hash, g_str_equal, NULL, g_free);
	ip4_config = lease_to_ip4_config (iface,
	                                  nm_dhcp_client_get_ifindex (NM_DHCP_CLIENT (self)),
	                                  lease,
	                                  options,
	                                  nm_dhcp_client_get_priority (NM_DHCP_CLIENT (self)),
	                                  TRUE,
	                                  &error);
	if (ip4_config) {
		const uint8_t *client_id = NULL;
		size_t client_id_len = 0;
		uint8_t type = 0;

		add_requests_to_options (options, dhcp4_requests);
		dhcp_lease_save (lease, priv->lease_file);

		sd_dhcp_client_get_client_id(priv->client4, &type, &client_id, &client_id_len);
		if (client_id)
			_save_client_id (self, type, client_id, client_id_len);

		nm_dhcp_client_set_state (NM_DHCP_CLIENT (self),
		                          NM_DHCP_STATE_BOUND,
		                          G_OBJECT (ip4_config),
		                          options);
	} else {
		nm_log_warn (LOGD_DHCP4, "(%s): %s", iface, error->message);
		nm_dhcp_client_set_state (NM_DHCP_CLIENT (self), NM_DHCP_STATE_FAIL, NULL, NULL);
		g_clear_error (&error);
	}

	g_hash_table_destroy (options);
	g_clear_object (&ip4_config);
}

static void
dhcp_event_cb (sd_dhcp_client *client, int event, gpointer user_data)
{
	NMDhcpSystemd *self = NM_DHCP_SYSTEMD (user_data);
	NMDhcpSystemdPrivate *priv = NM_DHCP_SYSTEMD_GET_PRIVATE (self);
	const char *iface = nm_dhcp_client_get_iface (NM_DHCP_CLIENT (self));

	g_assert (priv->client4 == client);

	nm_log_dbg (LOGD_DHCP4, "(%s): DHCPv4 client event %d", iface, event);

	switch (event) {
	case DHCP_EVENT_EXPIRED:
		nm_dhcp_client_set_state (NM_DHCP_CLIENT (user_data), NM_DHCP_STATE_EXPIRE, NULL, NULL);
		break;
	case DHCP_EVENT_STOP:
		nm_dhcp_client_set_state (NM_DHCP_CLIENT (user_data), NM_DHCP_STATE_FAIL, NULL, NULL);
		break;
	case DHCP_EVENT_RENEW:
	case DHCP_EVENT_IP_CHANGE:
	case DHCP_EVENT_IP_ACQUIRE:
		bound4_handle (self);
		break;
	default:
		nm_log_warn (LOGD_DHCP4, "(%s): unhandled DHCP event %d", iface, event);
		break;
	}
}

static guint16
get_arp_type (const GByteArray *hwaddr)
{
	if (hwaddr->len == ETH_ALEN)
		return ARPHRD_ETHER;
	else if (hwaddr->len == INFINIBAND_ALEN)
		return ARPHRD_INFINIBAND;
	else
		g_assert_not_reached ();
}

static gboolean
ip4_start (NMDhcpClient *client, const char *dhcp_anycast_addr, const char *last_ip4_address)
{
	NMDhcpSystemdPrivate *priv = NM_DHCP_SYSTEMD_GET_PRIVATE (client);
	const char *iface = nm_dhcp_client_get_iface (client);
	const GByteArray *hwaddr;
	sd_dhcp_lease *lease = NULL;
	GBytes *override_client_id;
	const uint8_t *client_id = NULL;
	size_t client_id_len = 0;
	struct in_addr last_addr = { 0 };
	const char *hostname;
	int r, i;
	gboolean success = FALSE;

	g_assert (priv->client4 == NULL);
	g_assert (priv->client6 == NULL);

	g_free (priv->lease_file);
	priv->lease_file = get_leasefile_path (iface, nm_dhcp_client_get_uuid (client), FALSE);

	r = sd_dhcp_client_new (&priv->client4);
	if (r < 0) {
		nm_log_warn (LOGD_DHCP4, "(%s): failed to create DHCPv4 client (%d)", iface, r);
		return FALSE;
	}

	r = sd_dhcp_client_attach_event (priv->client4, NULL, 0);
	if (r < 0) {
		nm_log_warn (LOGD_DHCP4, "(%s): failed to attach DHCP event (%d)", iface, r);
		goto error;
	}

	hwaddr = nm_dhcp_client_get_hw_addr (client);
	if (hwaddr) {
		r = sd_dhcp_client_set_mac (priv->client4,
		                            hwaddr->data,
		                            hwaddr->len,
		                            get_arp_type (hwaddr));
		if (r < 0) {
			nm_log_warn (LOGD_DHCP4, "(%s): failed to set DHCP MAC address (%d)", iface, r);
			goto error;
		}
	}

	r = sd_dhcp_client_set_index (priv->client4, nm_dhcp_client_get_ifindex (client));
	if (r < 0) {
		nm_log_warn (LOGD_DHCP4, "(%s): failed to set DHCP ifindex (%d)", iface, r);
		goto error;
	}

	r = sd_dhcp_client_set_callback (priv->client4, dhcp_event_cb, client);
	if (r < 0) {
		nm_log_warn (LOGD_DHCP4, "(%s): failed to set DHCP callback (%d)", iface, r);
		goto error;
	}

	r = sd_dhcp_client_set_request_broadcast (priv->client4, true);
	if (r < 0) {
		nm_log_warn (LOGD_DHCP4, "(%s): failed to set DHCP broadcast (%d)", iface, r);
		goto error;
	}

	dhcp_lease_load (&lease, priv->lease_file);

	if (last_ip4_address)
		inet_pton (AF_INET, last_ip4_address, &last_addr);
	else if (lease)
		sd_dhcp_lease_get_address (lease, &last_addr);

	if (last_addr.s_addr) {
		r = sd_dhcp_client_set_request_address (priv->client4, &last_addr);
		if (r < 0) {
			nm_log_warn (LOGD_DHCP4, "(%s): failed to set last IPv4 address (%d)", iface, r);
			goto error;
		}
	}

	override_client_id = nm_dhcp_client_get_client_id (client);
	if (override_client_id) {
		client_id = g_bytes_get_data (override_client_id, &client_id_len);
		g_assert (client_id && client_id_len);
		sd_dhcp_client_set_client_id (priv->client4,
		                              client_id[0],
		                              client_id + 1,
		                              client_id_len - 1);
	} else if (lease) {
		r = sd_dhcp_lease_get_client_id (lease, (const void **) &client_id, &client_id_len);
		if (r == 0 && client_id_len) {
			sd_dhcp_client_set_client_id (priv->client4,
			                              client_id[0],
			                              client_id + 1,
			                              client_id_len - 1);
			_save_client_id (NM_DHCP_SYSTEMD (client),
			                 client_id[0],
			                 client_id + 1,
			                 client_id_len - 1);
		}
	}


	/* Add requested options */
	for (i = 0; dhcp4_requests[i].name; i++) {
		if (dhcp4_requests[i].include)
			sd_dhcp_client_set_request_option (priv->client4, dhcp4_requests[i].num);
	}

	hostname = nm_dhcp_client_get_hostname (client);
	if (hostname) {
		r = sd_dhcp_client_set_hostname (priv->client4, hostname);
		if (r < 0) {
			nm_log_warn (LOGD_DHCP4, "(%s): failed to set DHCP hostname (%d)", iface, r);
			goto error;
		}
	}

	r = sd_dhcp_client_start (priv->client4);
	if (r < 0) {
		nm_log_warn (LOGD_DHCP4, "(%s): failed to start DHCP (%d)", iface, r);
		goto error;
	}

	success = TRUE;

error:
	sd_dhcp_lease_unref (lease);
	if (!success)
		priv->client4 = sd_dhcp_client_unref (priv->client4);
	return success;
}

static void
bound6_handle (NMDhcpSystemd *self)
{
	/* not yet supported... */
	nm_log_warn (LOGD_DHCP6, "(%s): internal DHCP does not yet support DHCPv6",
	             nm_dhcp_client_get_iface (NM_DHCP_CLIENT (self)));
	nm_dhcp_client_set_state (NM_DHCP_CLIENT (self), NM_DHCP_STATE_FAIL, NULL, NULL);
}

static void
dhcp6_event_cb (sd_dhcp6_client *client, int event, gpointer user_data)
{
	NMDhcpSystemd *self = NM_DHCP_SYSTEMD (user_data);
	NMDhcpSystemdPrivate *priv = NM_DHCP_SYSTEMD_GET_PRIVATE (self);
	const char *iface = nm_dhcp_client_get_iface (NM_DHCP_CLIENT (self));

	g_assert (priv->client6 == client);

	nm_log_dbg (LOGD_DHCP6, "(%s): DHCPv6 client event %d", iface, event);

	switch (event) {
	case DHCP6_EVENT_RETRANS_MAX:
		nm_dhcp_client_set_state (NM_DHCP_CLIENT (user_data), NM_DHCP_STATE_TIMEOUT, NULL, NULL);
		break;
	case DHCP6_EVENT_RESEND_EXPIRE:
	case DHCP6_EVENT_STOP:
		nm_dhcp_client_set_state (NM_DHCP_CLIENT (user_data), NM_DHCP_STATE_FAIL, NULL, NULL);
		break;
	case DHCP6_EVENT_IP_ACQUIRE:
		bound6_handle (self);
		break;
	default:
		nm_log_warn (LOGD_DHCP6, "(%s): unhandled DHCPv6 event %d", iface, event);
		break;
	}
}

static gboolean
ip6_start (NMDhcpClient *client,
           const char *dhcp_anycast_addr,
           gboolean info_only,
           NMSettingIP6ConfigPrivacy privacy,
           const GByteArray *duid)
{
	NMDhcpSystemdPrivate *priv = NM_DHCP_SYSTEMD_GET_PRIVATE (client);
	const char *iface = nm_dhcp_client_get_iface (client);
	const GByteArray *hwaddr;
	int r, i;

	g_assert (priv->client4 == NULL);
	g_assert (priv->client6 == NULL);
	g_return_val_if_fail (duid != NULL, FALSE);

	g_free (priv->lease_file);
	priv->lease_file = get_leasefile_path (iface, nm_dhcp_client_get_uuid (client), TRUE);

	r = sd_dhcp6_client_new (&priv->client6);
	if (r < 0) {
		nm_log_warn (LOGD_DHCP6, "(%s): failed to create DHCPv6 client (%d)", iface, r);
		return FALSE;
	}

	/* NM stores the entire DUID which includes the uint16 "type", while systemd
	 * wants the type passed separately from the following data.
	 */
	r = sd_dhcp6_client_set_duid (priv->client6,
	                              ntohs (((const guint16 *) duid->data)[0]),
	                              duid->data + 2,
	                              duid->len - 2);
	if (r < 0) {
		nm_log_warn (LOGD_DHCP6, "(%s): failed to create DHCPv6 client (%d)", iface, r);
		return FALSE;
	}

	r = sd_dhcp6_client_attach_event (priv->client6, NULL, 0);
	if (r < 0) {
		nm_log_warn (LOGD_DHCP6, "(%s): failed to attach DHCP event (%d)", iface, r);
		goto error;
	}

	hwaddr = nm_dhcp_client_get_hw_addr (client);
	if (hwaddr) {
		r = sd_dhcp6_client_set_mac (priv->client6,
		                             hwaddr->data,
		                             hwaddr->len,
		                             get_arp_type (hwaddr));
		if (r < 0) {
			nm_log_warn (LOGD_DHCP6, "(%s): failed to set DHCP MAC address (%d)", iface, r);
			goto error;
		}
	}

	r = sd_dhcp6_client_set_index (priv->client6, nm_dhcp_client_get_ifindex (client));
	if (r < 0) {
		nm_log_warn (LOGD_DHCP6, "(%s): failed to set DHCP ifindex (%d)", iface, r);
		goto error;
	}

	r = sd_dhcp6_client_set_callback (priv->client6, dhcp6_event_cb, client);
	if (r < 0) {
		nm_log_warn (LOGD_DHCP6, "(%s): failed to set DHCP callback (%d)", iface, r);
		goto error;
	}

	/* Add requested options */
	for (i = 0; dhcp6_requests[i].name; i++) {
		if (dhcp6_requests[i].include)
			sd_dhcp6_client_set_request_option (priv->client6, dhcp6_requests[i].num);
	}

	r = sd_dhcp6_client_start (priv->client6);
	if (r < 0) {
		nm_log_warn (LOGD_DHCP6, "(%s): failed to start DHCP (%d)", iface, r);
		goto error;
	}

	return TRUE;

error:
	sd_dhcp6_client_unref (priv->client6);
	priv->client6 = NULL;
	return FALSE;
}

static void
stop (NMDhcpClient *client, gboolean release, const GByteArray *duid)
{
	NMDhcpSystemdPrivate *priv = NM_DHCP_SYSTEMD_GET_PRIVATE (client);
	int r = 0;

	if (priv->client4)
		r = sd_dhcp_client_stop (priv->client4);
	else if (priv->client6)
		r = sd_dhcp6_client_stop (priv->client6);

	if (r) {
		nm_log_warn (priv->client6 ? LOGD_DHCP6 : LOGD_DHCP4,
			         "(%s): failed to stop DHCP client (%d)",
			         nm_dhcp_client_get_iface (client),
			         r);
	}
}

/***************************************************/

static void
nm_dhcp_systemd_init (NMDhcpSystemd *self)
{
}

static void
dispose (GObject *object)
{
	NMDhcpSystemdPrivate *priv = NM_DHCP_SYSTEMD_GET_PRIVATE (object);

	g_clear_pointer (&priv->lease_file, g_free);

	if (priv->client4) {
		sd_dhcp_client_stop (priv->client4);
		sd_dhcp_client_unref (priv->client4);
		priv->client4 = NULL;
	}

	if (priv->client6) {
		sd_dhcp6_client_stop (priv->client6);
		sd_dhcp6_client_unref (priv->client6);
		priv->client6 = NULL;
	}

	G_OBJECT_CLASS (nm_dhcp_systemd_parent_class)->dispose (object);
}

static void
nm_dhcp_systemd_class_init (NMDhcpSystemdClass *sdhcp_class)
{
	NMDhcpClientClass *client_class = NM_DHCP_CLIENT_CLASS (sdhcp_class);
	GObjectClass *object_class = G_OBJECT_CLASS (sdhcp_class);

	g_type_class_add_private (sdhcp_class, sizeof (NMDhcpSystemdPrivate));

	/* virtual methods */
	object_class->dispose = dispose;

	client_class->ip4_start = ip4_start;
	client_class->ip6_start = ip6_start;
	client_class->stop = stop;
}

static void __attribute__((constructor))
register_dhcp_dhclient (void)
{
	nm_g_type_init ();
	_nm_dhcp_client_register (NM_TYPE_DHCP_SYSTEMD,
	                          "internal",
	                          NULL,
	                          nm_dhcp_systemd_get_lease_ip_configs);
}