summaryrefslogtreecommitdiffstats
path: root/src/libsystemd/sd-netlink/test-netlink.c
blob: df2e203abd8195a5f7e5851134255752b77fa917 (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
/* SPDX-License-Identifier: LGPL-2.1-or-later */

#include <net/if.h>
#include <netinet/ether.h>
#include <netinet/in.h>
#include <linux/fou.h>
#include <linux/genetlink.h>
#include <linux/if_macsec.h>
#include <linux/l2tp.h>
#include <linux/nl80211.h>
#include <unistd.h>

#include "sd-netlink.h"

#include "alloc-util.h"
#include "ether-addr-util.h"
#include "macro.h"
#include "netlink-genl.h"
#include "netlink-internal.h"
#include "netlink-util.h"
#include "socket-util.h"
#include "stdio-util.h"
#include "string-util.h"
#include "strv.h"
#include "tests.h"

static void test_message_link_bridge(sd_netlink *rtnl) {
        _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *message = NULL;
        uint32_t cost;

        log_debug("/* %s */", __func__);

        assert_se(sd_rtnl_message_new_link(rtnl, &message, RTM_NEWLINK, 1) >= 0);
        assert_se(sd_rtnl_message_link_set_family(message, AF_BRIDGE) >= 0);
        assert_se(sd_netlink_message_open_container(message, IFLA_PROTINFO) >= 0);
        assert_se(sd_netlink_message_append_u32(message, IFLA_BRPORT_COST, 10) >= 0);
        assert_se(sd_netlink_message_close_container(message) >= 0);

        assert_se(sd_netlink_message_rewind(message, rtnl) >= 0);

        assert_se(sd_netlink_message_enter_container(message, IFLA_PROTINFO) >= 0);
        assert_se(sd_netlink_message_read_u32(message, IFLA_BRPORT_COST, &cost) >= 0);
        assert_se(cost == 10);
        assert_se(sd_netlink_message_exit_container(message) >= 0);
}

static void test_link_configure(sd_netlink *rtnl, int ifindex) {
        _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *message = NULL, *reply = NULL;
        uint32_t mtu_out;
        const char *name_out;
        struct ether_addr mac_out;

        log_debug("/* %s */", __func__);

        /* we'd really like to test NEWLINK, but let's not mess with the running kernel */
        assert_se(sd_rtnl_message_new_link(rtnl, &message, RTM_GETLINK, ifindex) >= 0);

        assert_se(sd_netlink_call(rtnl, message, 0, &reply) == 1);

        assert_se(sd_netlink_message_read_string(reply, IFLA_IFNAME, &name_out) >= 0);
        assert_se(sd_netlink_message_read_ether_addr(reply, IFLA_ADDRESS, &mac_out) >= 0);
        assert_se(sd_netlink_message_read_u32(reply, IFLA_MTU, &mtu_out) >= 0);
}

static void test_link_get(sd_netlink *rtnl, int ifindex) {
        _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL, *r = NULL;
        const char *str_data;
        uint8_t u8_data;
        uint32_t u32_data;
        struct ether_addr eth_data;

        log_debug("/* %s */", __func__);

        assert_se(sd_rtnl_message_new_link(rtnl, &m, RTM_GETLINK, ifindex) >= 0);
        assert_se(m);

        assert_se(sd_netlink_call(rtnl, m, 0, &r) == 1);

        assert_se(sd_netlink_message_read_string(r, IFLA_IFNAME, &str_data) == 0);

        assert_se(sd_netlink_message_read_u8(r, IFLA_CARRIER, &u8_data) == 0);
        assert_se(sd_netlink_message_read_u8(r, IFLA_OPERSTATE, &u8_data) == 0);
        assert_se(sd_netlink_message_read_u8(r, IFLA_LINKMODE, &u8_data) == 0);

        assert_se(sd_netlink_message_read_u32(r, IFLA_MTU, &u32_data) == 0);
        assert_se(sd_netlink_message_read_u32(r, IFLA_GROUP, &u32_data) == 0);
        assert_se(sd_netlink_message_read_u32(r, IFLA_TXQLEN, &u32_data) == 0);
        assert_se(sd_netlink_message_read_u32(r, IFLA_NUM_TX_QUEUES, &u32_data) == 0);

        assert_se(sd_netlink_message_read_ether_addr(r, IFLA_ADDRESS, &eth_data) == 0);
}

static void test_address_get(sd_netlink *rtnl, int ifindex) {
        _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL, *r = NULL;
        struct in_addr in_data;
        struct ifa_cacheinfo cache;
        const char *label;

        log_debug("/* %s */", __func__);

        assert_se(sd_rtnl_message_new_addr(rtnl, &m, RTM_GETADDR, ifindex, AF_INET) >= 0);
        assert_se(m);
        assert_se(sd_netlink_message_set_request_dump(m, true) >= 0);
        assert_se(sd_netlink_call(rtnl, m, -1, &r) == 1);

        assert_se(sd_netlink_message_read_in_addr(r, IFA_LOCAL, &in_data) == 0);
        assert_se(sd_netlink_message_read_in_addr(r, IFA_ADDRESS, &in_data) == 0);
        assert_se(sd_netlink_message_read_string(r, IFA_LABEL, &label) == 0);
        assert_se(sd_netlink_message_read_cache_info(r, IFA_CACHEINFO, &cache) == 0);
}

static void test_route(sd_netlink *rtnl) {
        _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
        struct in_addr addr, addr_data;
        uint32_t index = 2, u32_data;
        int r;

        log_debug("/* %s */", __func__);

        r = sd_rtnl_message_new_route(rtnl, &req, RTM_NEWROUTE, AF_INET, RTPROT_STATIC);
        if (r < 0) {
                log_error_errno(r, "Could not create RTM_NEWROUTE message: %m");
                return;
        }

        addr.s_addr = htobe32(INADDR_LOOPBACK);

        r = sd_netlink_message_append_in_addr(req, RTA_GATEWAY, &addr);
        if (r < 0) {
                log_error_errno(r, "Could not append RTA_GATEWAY attribute: %m");
                return;
        }

        r = sd_netlink_message_append_u32(req, RTA_OIF, index);
        if (r < 0) {
                log_error_errno(r, "Could not append RTA_OIF attribute: %m");
                return;
        }

        assert_se(sd_netlink_message_rewind(req, rtnl) >= 0);

        assert_se(sd_netlink_message_read_in_addr(req, RTA_GATEWAY, &addr_data) >= 0);
        assert_se(addr_data.s_addr == addr.s_addr);

        assert_se(sd_netlink_message_read_u32(req, RTA_OIF, &u32_data) >= 0);
        assert_se(u32_data == index);

        assert_se((req = sd_netlink_message_unref(req)) == NULL);
}

static void test_multiple(void) {
        sd_netlink *rtnl1, *rtnl2;

        log_debug("/* %s */", __func__);

        assert_se(sd_netlink_open(&rtnl1) >= 0);
        assert_se(sd_netlink_open(&rtnl2) >= 0);

        rtnl1 = sd_netlink_unref(rtnl1);
        rtnl2 = sd_netlink_unref(rtnl2);
}

static int link_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
        char *ifname = userdata;
        const char *data;

        assert_se(rtnl);
        assert_se(m);
        assert_se(userdata);

        log_info("%s: got link info about %s", __func__, ifname);
        free(ifname);

        assert_se(sd_netlink_message_read_string(m, IFLA_IFNAME, &data) >= 0);
        assert_se(streq(data, "lo"));

        return 1;
}

static void test_event_loop(int ifindex) {
        _cleanup_(sd_event_unrefp) sd_event *event = NULL;
        _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
        _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
        char *ifname;

        log_debug("/* %s */", __func__);

        ifname = strdup("lo2");
        assert_se(ifname);

        assert_se(sd_netlink_open(&rtnl) >= 0);
        assert_se(sd_rtnl_message_new_link(rtnl, &m, RTM_GETLINK, ifindex) >= 0);

        assert_se(sd_netlink_call_async(rtnl, NULL, m, link_handler, NULL, ifname, 0, NULL) >= 0);

        assert_se(sd_event_default(&event) >= 0);

        assert_se(sd_netlink_attach_event(rtnl, event, 0) >= 0);

        assert_se(sd_event_run(event, 0) >= 0);

        assert_se(sd_netlink_detach_event(rtnl) >= 0);

        assert_se((rtnl = sd_netlink_unref(rtnl)) == NULL);
}

static void test_async_destroy(void *userdata) {
}

static void test_async(int ifindex) {
        _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
        _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL, *r = NULL;
        _cleanup_(sd_netlink_slot_unrefp) sd_netlink_slot *slot = NULL;
        sd_netlink_destroy_t destroy_callback;
        const char *description;
        char *ifname;

        log_debug("/* %s */", __func__);

        ifname = strdup("lo");
        assert_se(ifname);

        assert_se(sd_netlink_open(&rtnl) >= 0);

        assert_se(sd_rtnl_message_new_link(rtnl, &m, RTM_GETLINK, ifindex) >= 0);

        assert_se(sd_netlink_call_async(rtnl, &slot, m, link_handler, test_async_destroy, ifname, 0, "hogehoge") >= 0);

        assert_se(sd_netlink_slot_get_netlink(slot) == rtnl);
        assert_se(sd_netlink_slot_get_userdata(slot) == ifname);
        assert_se(sd_netlink_slot_get_destroy_callback(slot, &destroy_callback) == 1);
        assert_se(destroy_callback == test_async_destroy);
        assert_se(sd_netlink_slot_get_floating(slot) == 0);
        assert_se(sd_netlink_slot_get_description(slot, &description) == 1);
        assert_se(streq(description, "hogehoge"));

        assert_se(sd_netlink_wait(rtnl, 0) >= 0);
        assert_se(sd_netlink_process(rtnl, &r) >= 0);

        assert_se((rtnl = sd_netlink_unref(rtnl)) == NULL);
}

static void test_slot_set(int ifindex) {
        _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
        _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL, *r = NULL;
        _cleanup_(sd_netlink_slot_unrefp) sd_netlink_slot *slot = NULL;
        sd_netlink_destroy_t destroy_callback;
        const char *description;
        char *ifname;

        log_debug("/* %s */", __func__);

        ifname = strdup("lo");
        assert_se(ifname);

        assert_se(sd_netlink_open(&rtnl) >= 0);

        assert_se(sd_rtnl_message_new_link(rtnl, &m, RTM_GETLINK, ifindex) >= 0);

        assert_se(sd_netlink_call_async(rtnl, &slot, m, link_handler, NULL, NULL, 0, NULL) >= 0);

        assert_se(sd_netlink_slot_get_netlink(slot) == rtnl);
        assert_se(!sd_netlink_slot_get_userdata(slot));
        assert_se(!sd_netlink_slot_set_userdata(slot, ifname));
        assert_se(sd_netlink_slot_get_userdata(slot) == ifname);
        assert_se(sd_netlink_slot_get_destroy_callback(slot, NULL) == 0);
        assert_se(sd_netlink_slot_set_destroy_callback(slot, test_async_destroy) >= 0);
        assert_se(sd_netlink_slot_get_destroy_callback(slot, &destroy_callback) == 1);
        assert_se(destroy_callback == test_async_destroy);
        assert_se(sd_netlink_slot_get_floating(slot) == 0);
        assert_se(sd_netlink_slot_set_floating(slot, 1) == 1);
        assert_se(sd_netlink_slot_get_floating(slot) == 1);
        assert_se(sd_netlink_slot_get_description(slot, NULL) == 0);
        assert_se(sd_netlink_slot_set_description(slot, "hogehoge") >= 0);
        assert_se(sd_netlink_slot_get_description(slot, &description) == 1);
        assert_se(streq(description, "hogehoge"));

        assert_se(sd_netlink_wait(rtnl, 0) >= 0);
        assert_se(sd_netlink_process(rtnl, &r) >= 0);

        assert_se((rtnl = sd_netlink_unref(rtnl)) == NULL);
}

struct test_async_object {
        unsigned n_ref;
        char *ifname;
};

static struct test_async_object *test_async_object_free(struct test_async_object *t) {
        assert_se(t);

        free(t->ifname);
        return mfree(t);
}

DEFINE_PRIVATE_TRIVIAL_REF_UNREF_FUNC(struct test_async_object, test_async_object, test_async_object_free);
DEFINE_TRIVIAL_CLEANUP_FUNC(struct test_async_object *, test_async_object_unref);

static int link_handler2(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
        struct test_async_object *t = userdata;
        const char *data;

        assert_se(rtnl);
        assert_se(m);
        assert_se(userdata);

        log_info("%s: got link info about %s", __func__, t->ifname);

        assert_se(sd_netlink_message_read_string(m, IFLA_IFNAME, &data) >= 0);
        assert_se(streq(data, "lo"));

        return 1;
}

static void test_async_object_destroy(void *userdata) {
        struct test_async_object *t = userdata;

        assert_se(userdata);

        log_info("%s: n_ref=%u", __func__, t->n_ref);
        test_async_object_unref(t);
}

static void test_async_destroy_callback(int ifindex) {
        _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
        _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL, *r = NULL;
        _cleanup_(test_async_object_unrefp) struct test_async_object *t = NULL;
        _cleanup_(sd_netlink_slot_unrefp) sd_netlink_slot *slot = NULL;
        char *ifname;

        log_debug("/* %s */", __func__);

        assert_se(t = new(struct test_async_object, 1));
        assert_se(ifname = strdup("lo"));
        *t = (struct test_async_object) {
                .n_ref = 1,
                .ifname = ifname,
        };

        assert_se(sd_netlink_open(&rtnl) >= 0);

        /* destroy callback is called after processing message */
        assert_se(sd_rtnl_message_new_link(rtnl, &m, RTM_GETLINK, ifindex) >= 0);
        assert_se(sd_netlink_call_async(rtnl, NULL, m, link_handler2, test_async_object_destroy, t, 0, NULL) >= 0);

        assert_se(t->n_ref == 1);
        assert_se(test_async_object_ref(t));
        assert_se(t->n_ref == 2);

        assert_se(sd_netlink_wait(rtnl, 0) >= 0);
        assert_se(sd_netlink_process(rtnl, &r) == 1);
        assert_se(t->n_ref == 1);

        assert_se(!sd_netlink_message_unref(m));

        /* destroy callback is called when asynchronous call is cancelled, that is, slot is freed. */
        assert_se(sd_rtnl_message_new_link(rtnl, &m, RTM_GETLINK, ifindex) >= 0);
        assert_se(sd_netlink_call_async(rtnl, &slot, m, link_handler2, test_async_object_destroy, t, 0, NULL) >= 0);

        assert_se(t->n_ref == 1);
        assert_se(test_async_object_ref(t));
        assert_se(t->n_ref == 2);

        assert_se(!(slot = sd_netlink_slot_unref(slot)));
        assert_se(t->n_ref == 1);

        assert_se(!sd_netlink_message_unref(m));

        /* destroy callback is also called by sd_netlink_unref() */
        assert_se(sd_rtnl_message_new_link(rtnl, &m, RTM_GETLINK, ifindex) >= 0);
        assert_se(sd_netlink_call_async(rtnl, NULL, m, link_handler2, test_async_object_destroy, t, 0, NULL) >= 0);

        assert_se(t->n_ref == 1);
        assert_se(test_async_object_ref(t));
        assert_se(t->n_ref == 2);

        assert_se((rtnl = sd_netlink_unref(rtnl)) == NULL);
        assert_se(t->n_ref == 1);
}

static int pipe_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
        int *counter = userdata;
        int r;

        (*counter)--;

        r = sd_netlink_message_get_errno(m);

        log_info_errno(r, "%d left in pipe. got reply: %m", *counter);

        assert_se(r >= 0);

        return 1;
}

static void test_pipe(int ifindex) {
        _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
        _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m1 = NULL, *m2 = NULL;
        int counter = 0;

        log_debug("/* %s */", __func__);

        assert_se(sd_netlink_open(&rtnl) >= 0);

        assert_se(sd_rtnl_message_new_link(rtnl, &m1, RTM_GETLINK, ifindex) >= 0);
        assert_se(sd_rtnl_message_new_link(rtnl, &m2, RTM_GETLINK, ifindex) >= 0);

        counter++;
        assert_se(sd_netlink_call_async(rtnl, NULL, m1, pipe_handler, NULL, &counter, 0, NULL) >= 0);

        counter++;
        assert_se(sd_netlink_call_async(rtnl, NULL, m2, pipe_handler, NULL, &counter, 0, NULL) >= 0);

        while (counter > 0) {
                assert_se(sd_netlink_wait(rtnl, 0) >= 0);
                assert_se(sd_netlink_process(rtnl, NULL) >= 0);
        }

        assert_se((rtnl = sd_netlink_unref(rtnl)) == NULL);
}

static void test_container(sd_netlink *rtnl) {
        _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
        uint16_t u16_data;
        uint32_t u32_data;
        const char *string_data;

        log_debug("/* %s */", __func__);

        assert_se(sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0) >= 0);

        assert_se(sd_netlink_message_open_container(m, IFLA_LINKINFO) >= 0);
        assert_se(sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "vlan") >= 0);
        assert_se(sd_netlink_message_append_u16(m, IFLA_VLAN_ID, 100) >= 0);
        assert_se(sd_netlink_message_close_container(m) >= 0);
        assert_se(sd_netlink_message_append_string(m, IFLA_INFO_KIND, "vlan") >= 0);
        assert_se(sd_netlink_message_close_container(m) >= 0);
        assert_se(sd_netlink_message_close_container(m) == -EINVAL);

        assert_se(sd_netlink_message_rewind(m, rtnl) >= 0);

        assert_se(sd_netlink_message_enter_container(m, IFLA_LINKINFO) >= 0);
        assert_se(sd_netlink_message_read_string(m, IFLA_INFO_KIND, &string_data) >= 0);
        assert_se(streq("vlan", string_data));

        assert_se(sd_netlink_message_enter_container(m, IFLA_INFO_DATA) >= 0);
        assert_se(sd_netlink_message_read_u16(m, IFLA_VLAN_ID, &u16_data) >= 0);
        assert_se(sd_netlink_message_exit_container(m) >= 0);

        assert_se(sd_netlink_message_read_string(m, IFLA_INFO_KIND, &string_data) >= 0);
        assert_se(streq("vlan", string_data));
        assert_se(sd_netlink_message_exit_container(m) >= 0);

        assert_se(sd_netlink_message_read_u32(m, IFLA_LINKINFO, &u32_data) < 0);

        assert_se(sd_netlink_message_exit_container(m) == -EINVAL);
}

static void test_match(void) {
        _cleanup_(sd_netlink_slot_unrefp) sd_netlink_slot *s1 = NULL, *s2 = NULL;
        _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;

        log_debug("/* %s */", __func__);

        assert_se(sd_netlink_open(&rtnl) >= 0);

        assert_se(sd_netlink_add_match(rtnl, &s1, RTM_NEWLINK, link_handler, NULL, NULL, NULL) >= 0);
        assert_se(sd_netlink_add_match(rtnl, &s2, RTM_NEWLINK, link_handler, NULL, NULL, NULL) >= 0);
        assert_se(sd_netlink_add_match(rtnl, NULL, RTM_NEWLINK, link_handler, NULL, NULL, NULL) >= 0);

        assert_se(!(s1 = sd_netlink_slot_unref(s1)));
        assert_se(!(s2 = sd_netlink_slot_unref(s2)));

        assert_se((rtnl = sd_netlink_unref(rtnl)) == NULL);
}

static void test_get_addresses(sd_netlink *rtnl) {
        _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
        sd_netlink_message *m;

        log_debug("/* %s */", __func__);

        assert_se(sd_rtnl_message_new_addr(rtnl, &req, RTM_GETADDR, 0, AF_UNSPEC) >= 0);
        assert_se(sd_netlink_message_set_request_dump(req, true) >= 0);
        assert_se(sd_netlink_call(rtnl, req, 0, &reply) >= 0);

        for (m = reply; m; m = sd_netlink_message_next(m)) {
                uint16_t type;
                unsigned char scope, flags;
                int family, ifindex;

                assert_se(sd_netlink_message_get_type(m, &type) >= 0);
                assert_se(type == RTM_NEWADDR);

                assert_se(sd_rtnl_message_addr_get_ifindex(m, &ifindex) >= 0);
                assert_se(sd_rtnl_message_addr_get_family(m, &family) >= 0);
                assert_se(sd_rtnl_message_addr_get_scope(m, &scope) >= 0);
                assert_se(sd_rtnl_message_addr_get_flags(m, &flags) >= 0);

                assert_se(ifindex > 0);
                assert_se(IN_SET(family, AF_INET, AF_INET6));

                log_info("got IPv%i address on ifindex %i", family == AF_INET ? 4 : 6, ifindex);
        }
}

static void test_message(sd_netlink *rtnl) {
        _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;

        log_debug("/* %s */", __func__);

        assert_se(message_new_synthetic_error(rtnl, -ETIMEDOUT, 1, &m) >= 0);
        assert_se(sd_netlink_message_get_errno(m) == -ETIMEDOUT);
}

static void test_array(void) {
        _cleanup_(sd_netlink_unrefp) sd_netlink *genl = NULL;
        _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;

        log_debug("/* %s */", __func__);

        assert_se(sd_genl_socket_open(&genl) >= 0);
        assert_se(sd_genl_message_new(genl, CTRL_GENL_NAME, CTRL_CMD_GETFAMILY, &m) >= 0);

        assert_se(sd_netlink_message_open_container(m, CTRL_ATTR_MCAST_GROUPS) >= 0);
        for (unsigned i = 0; i < 10; i++) {
                char name[STRLEN("hoge") + DECIMAL_STR_MAX(uint32_t)];
                uint32_t id = i + 1000;

                xsprintf(name, "hoge%" PRIu32, id);
                assert_se(sd_netlink_message_open_array(m, i + 1) >= 0);
                assert_se(sd_netlink_message_append_u32(m, CTRL_ATTR_MCAST_GRP_ID, id) >= 0);
                assert_se(sd_netlink_message_append_string(m, CTRL_ATTR_MCAST_GRP_NAME, name) >= 0);
                assert_se(sd_netlink_message_close_container(m) >= 0);
        }
        assert_se(sd_netlink_message_close_container(m) >= 0);

        message_seal(m);
        assert_se(sd_netlink_message_rewind(m, genl) >= 0);

        assert_se(sd_netlink_message_enter_container(m, CTRL_ATTR_MCAST_GROUPS) >= 0);
        for (unsigned i = 0; i < 10; i++) {
                char expected[STRLEN("hoge") + DECIMAL_STR_MAX(uint32_t)];
                const char *name;
                uint32_t id;

                assert_se(sd_netlink_message_enter_array(m, i + 1) >= 0);
                assert_se(sd_netlink_message_read_u32(m, CTRL_ATTR_MCAST_GRP_ID, &id) >= 0);
                assert_se(sd_netlink_message_read_string(m, CTRL_ATTR_MCAST_GRP_NAME, &name) >= 0);
                assert_se(sd_netlink_message_exit_container(m) >= 0);

                assert_se(id == i + 1000);
                xsprintf(expected, "hoge%" PRIu32, id);
                assert_se(streq(name, expected));
        }
        assert_se(sd_netlink_message_exit_container(m) >= 0);
}

static void test_strv(sd_netlink *rtnl) {
        _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
        _cleanup_strv_free_ char **names_in = NULL, **names_out;
        const char *p;

        log_debug("/* %s */", __func__);

        assert_se(sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINKPROP, 1) >= 0);

        for (unsigned i = 0; i < 10; i++) {
                char name[STRLEN("hoge") + DECIMAL_STR_MAX(uint32_t)];

                xsprintf(name, "hoge%" PRIu32, i + 1000);
                assert_se(strv_extend(&names_in, name) >= 0);
        }

        assert_se(sd_netlink_message_open_container(m, IFLA_PROP_LIST) >= 0);
        assert_se(sd_netlink_message_append_strv(m, IFLA_ALT_IFNAME, (const char**) names_in) >= 0);
        assert_se(sd_netlink_message_close_container(m) >= 0);

        message_seal(m);
        assert_se(sd_netlink_message_rewind(m, rtnl) >= 0);

        assert_se(sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &names_out) >= 0);
        assert_se(strv_equal(names_in, names_out));

        assert_se(sd_netlink_message_enter_container(m, IFLA_PROP_LIST) >= 0);
        assert_se(sd_netlink_message_read_string(m, IFLA_ALT_IFNAME, &p) >= 0);
        assert_se(streq(p, "hoge1009"));
        assert_se(sd_netlink_message_exit_container(m) >= 0);
}

static int genl_ctrl_match_callback(sd_netlink *genl, sd_netlink_message *m, void *userdata) {
        const char *name;
        uint16_t id;
        uint8_t cmd;

        assert_se(genl);
        assert_se(m);

        assert_se(sd_genl_message_get_family_name(genl, m, &name) >= 0);
        assert_se(streq(name, CTRL_GENL_NAME));

        assert_se(sd_genl_message_get_command(genl, m, &cmd) >= 0);

        switch (cmd) {
        case CTRL_CMD_NEWFAMILY:
        case CTRL_CMD_DELFAMILY:
                assert_se(sd_netlink_message_read_string(m, CTRL_ATTR_FAMILY_NAME, &name) >= 0);
                assert_se(sd_netlink_message_read_u16(m, CTRL_ATTR_FAMILY_ID, &id) >= 0);
                log_debug("%s: %s (id=%"PRIu16") family is %s.",
                          __func__, name, id, cmd == CTRL_CMD_NEWFAMILY ? "added" : "removed");
                break;
        case CTRL_CMD_NEWMCAST_GRP:
        case CTRL_CMD_DELMCAST_GRP:
                assert_se(sd_netlink_message_read_string(m, CTRL_ATTR_FAMILY_NAME, &name) >= 0);
                assert_se(sd_netlink_message_read_u16(m, CTRL_ATTR_FAMILY_ID, &id) >= 0);
                log_debug("%s: multicast group for %s (id=%"PRIu16") family is %s.",
                          __func__, name, id, cmd == CTRL_CMD_NEWMCAST_GRP ? "added" : "removed");
                break;
        default:
                log_debug("%s: received nlctrl message with unknown command '%"PRIu8"'.", __func__, cmd);
        }

        return 0;
}

static void test_genl(void) {
        _cleanup_(sd_event_unrefp) sd_event *event = NULL;
        _cleanup_(sd_netlink_unrefp) sd_netlink *genl = NULL;
        _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
        const char *name;
        uint8_t cmd;
        int r;

        log_debug("/* %s */", __func__);

        assert_se(sd_genl_socket_open(&genl) >= 0);
        assert_se(sd_event_default(&event) >= 0);
        assert_se(sd_netlink_attach_event(genl, event, 0) >= 0);

        assert_se(sd_genl_message_new(genl, CTRL_GENL_NAME, CTRL_CMD_GETFAMILY, &m) >= 0);
        assert_se(sd_genl_message_get_family_name(genl, m, &name) >= 0);
        assert_se(streq(name, CTRL_GENL_NAME));
        assert_se(sd_genl_message_get_command(genl, m, &cmd) >= 0);
        assert_se(cmd == CTRL_CMD_GETFAMILY);

        assert_se(sd_genl_add_match(genl, NULL, CTRL_GENL_NAME, "notify", 0, genl_ctrl_match_callback, NULL, NULL, "genl-ctrl-notify") >= 0);

        m = sd_netlink_message_unref(m);
        assert_se(sd_genl_message_new(genl, "should-not-exist", CTRL_CMD_GETFAMILY, &m) < 0);
        assert_se(sd_genl_message_new(genl, "should-not-exist", CTRL_CMD_GETFAMILY, &m) == -EOPNOTSUPP);

        /* These families may not be supported by kernel. Hence, ignore results. */
        (void) sd_genl_message_new(genl, FOU_GENL_NAME, 0, &m);
        m = sd_netlink_message_unref(m);
        (void) sd_genl_message_new(genl, L2TP_GENL_NAME, 0, &m);
        m = sd_netlink_message_unref(m);
        (void) sd_genl_message_new(genl, MACSEC_GENL_NAME, 0, &m);
        m = sd_netlink_message_unref(m);
        (void) sd_genl_message_new(genl, NL80211_GENL_NAME, 0, &m);
        m = sd_netlink_message_unref(m);
        (void) sd_genl_message_new(genl, NETLBL_NLTYPE_UNLABELED_NAME, 0, &m);

        for (;;) {
                r = sd_event_run(event, 500 * USEC_PER_MSEC);
                assert_se(r >= 0);
                if (r == 0)
                        return;
        }
}

static void test_rtnl_set_link_name(sd_netlink *rtnl, int ifindex) {
        _cleanup_strv_free_ char **alternative_names = NULL;
        int r;

        log_debug("/* %s */", __func__);

        if (geteuid() != 0)
                return (void) log_tests_skipped("not root");

        /* Test that the new name (which is currently an alternative name) is
         * restored as an alternative name on error. Create an error by using
         * an invalid device name, namely one that exceeds IFNAMSIZ
         * (alternative names can exceed IFNAMSIZ, but not regular names). */
        r = rtnl_set_link_alternative_names(&rtnl, ifindex, STRV_MAKE("testlongalternativename"));
        if (r == -EPERM)
                return (void) log_tests_skipped("missing required capabilities");

        assert_se(r >= 0);
        assert_se(rtnl_set_link_name(&rtnl, ifindex, "testlongalternativename") == -EINVAL);
        assert_se(rtnl_get_link_alternative_names(&rtnl, ifindex, &alternative_names) >= 0);
        assert_se(strv_contains(alternative_names, "testlongalternativename"));
        assert_se(rtnl_delete_link_alternative_names(&rtnl, ifindex, STRV_MAKE("testlongalternativename")) >= 0);
}

int main(void) {
        sd_netlink *rtnl;
        sd_netlink_message *m;
        sd_netlink_message *r;
        const char *string_data;
        int if_loopback;
        uint16_t type;

        test_setup_logging(LOG_DEBUG);

        test_match();
        test_multiple();

        assert_se(sd_netlink_open(&rtnl) >= 0);
        assert_se(rtnl);

        test_route(rtnl);
        test_message(rtnl);
        test_container(rtnl);
        test_array();
        test_strv(rtnl);

        if_loopback = (int) if_nametoindex("lo");
        assert_se(if_loopback > 0);

        test_async(if_loopback);
        test_slot_set(if_loopback);
        test_async_destroy_callback(if_loopback);
        test_pipe(if_loopback);
        test_event_loop(if_loopback);
        test_link_configure(rtnl, if_loopback);
        test_rtnl_set_link_name(rtnl, if_loopback);

        test_get_addresses(rtnl);
        test_message_link_bridge(rtnl);

        assert_se(sd_rtnl_message_new_link(rtnl, &m, RTM_GETLINK, if_loopback) >= 0);
        assert_se(m);

        assert_se(sd_netlink_message_get_type(m, &type) >= 0);
        assert_se(type == RTM_GETLINK);

        assert_se(sd_netlink_message_read_string(m, IFLA_IFNAME, &string_data) == -EPERM);

        assert_se(sd_netlink_call(rtnl, m, 0, &r) == 1);
        assert_se(sd_netlink_message_get_type(r, &type) >= 0);
        assert_se(type == RTM_NEWLINK);

        assert_se((r = sd_netlink_message_unref(r)) == NULL);

        assert_se(sd_netlink_call(rtnl, m, -1, &r) == -EPERM);
        assert_se((m = sd_netlink_message_unref(m)) == NULL);
        assert_se((r = sd_netlink_message_unref(r)) == NULL);

        test_link_get(rtnl, if_loopback);
        test_address_get(rtnl, if_loopback);

        assert_se((m = sd_netlink_message_unref(m)) == NULL);
        assert_se((r = sd_netlink_message_unref(r)) == NULL);
        assert_se((rtnl = sd_netlink_unref(rtnl)) == NULL);

        test_genl();

        return EXIT_SUCCESS;
}