summaryrefslogtreecommitdiff
path: root/src/responder/nss/nsssrv_netgroup.c
blob: 593b7e435b1e8e504975d20a2295ce65cb60e7a0 (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
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
/*
    SSSD

    nsssrv_netgroup.c

    Authors:
        Stephen Gallagher <sgallagh@redhat.com>

    Copyright (C) 2010 Red Hat

    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 3 of the License, 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, see <http://www.gnu.org/licenses/>.
*/

#include <collection.h>
#include "util/util.h"
#include "responder/nss/nsssrv.h"
#include "responder/nss/nsssrv_private.h"
#include "responder/nss/nsssrv_netgroup.h"
#include "responder/common/negcache.h"
#include "confdb/confdb.h"
#include "db/sysdb.h"

static errno_t get_netgroup_entry(struct nss_ctx *nctx,
                                  char *name,
                                  struct getent_ctx **netgr)
{
    hash_key_t key;
    hash_value_t value;
    int hret;

    key.type = HASH_KEY_STRING;
    key.str = name;

    hret = hash_lookup(nctx->netgroups, &key, &value);
    if (hret == HASH_SUCCESS) {
        *netgr = talloc_get_type(value.ptr, struct getent_ctx);
        return EOK;
    } else if (hret == HASH_ERROR_KEY_NOT_FOUND) {
        return ENOENT;
    }

    DEBUG(1, ("Unexpected error reading from netgroup hash [%d][%s]\n",
              hret, hash_error_string(hret)));
    return EIO;
}

static int netgr_hash_remove (TALLOC_CTX *ctx);
static errno_t set_netgroup_entry(struct nss_ctx *nctx,
                                  struct getent_ctx *netgr)
{
    hash_key_t key;
    hash_value_t value;
    int hret;

    if (netgr->name == NULL) {
        DEBUG(1, ("Missing netgroup name.\n"));
        return EINVAL;
    }
    /* Add this entry to the hash table */
    key.type = HASH_KEY_STRING;
    key.str = netgr->name;
    value.type = HASH_VALUE_PTR;
    value.ptr = netgr;
    hret = hash_enter(nctx->netgroups, &key, &value);
    if (hret != EOK) {
        DEBUG(0, ("Unable to add hash table entry for [%s]", key.str));
        DEBUG(4, ("Hash error [%d][%s]", hret, hash_error_string(hret)));
        return EIO;
    }
    talloc_steal(nctx->netgroups, netgr);
    talloc_set_destructor((TALLOC_CTX *) netgr, netgr_hash_remove);

    return EOK;
}

static struct tevent_req *setnetgrent_send(TALLOC_CTX *mem_ctx,
                                           const char *rawname,
                                           struct nss_cmd_ctx *cmdctx);
static void nss_cmd_setnetgrent_done(struct tevent_req *req);
int nss_cmd_setnetgrent(struct cli_ctx *client)
{
    struct nss_cmd_ctx *cmdctx;
    struct tevent_req *req;
    const char *rawname;
    uint8_t *body;
    size_t blen;
    errno_t ret = EOK;

    /* Reset the result cursor to zero */
    client->netgrent_cur = 0;

    cmdctx = talloc_zero(client, struct nss_cmd_ctx);
    if (!cmdctx) {
        return ENOMEM;
    }
    cmdctx->cctx = client;

    /* get netgroup name to query */
    sss_packet_get_body(client->creq->in, &body, &blen);

    /* if not terminated fail */
    if (body[blen -1] != '\0') {
        ret = EINVAL;
        goto done;
    }

    /* If the body isn't valid UTF-8, fail */
    if (!sss_utf8_check(body, blen -1)) {
        ret = EINVAL;
        goto done;
    }

    rawname = (const char *)body;

    req = setnetgrent_send(cmdctx, rawname, cmdctx);
    if (!req) {
        DEBUG(0, ("Fatal error calling setnetgrent_send\n"));
        ret = EIO;
        goto done;
    }
    tevent_req_set_callback(req, nss_cmd_setnetgrent_done, cmdctx);

done:
    return nss_cmd_done(cmdctx, ret);
}

static int netgr_hash_remove (TALLOC_CTX *ctx)
{
    int hret;
    hash_key_t key;
    struct getent_ctx *netgr =
            talloc_get_type(ctx, struct getent_ctx);

    key.type = HASH_KEY_STRING;
    key.str = netgr->name;

    /* Remove the netgroup result object from the lookup table */
    hret = hash_delete(netgr->lookup_table, &key);
    if (hret != HASH_SUCCESS) {
        DEBUG(0, ("Could not remove key [%s] from table! [%d][%s]\n",
                  netgr->name, hret, hash_error_string(hret)));
        return -1;
    }
    return 0;
}

struct setnetgrent_ctx {
    struct nss_ctx *nctx;
    struct nss_cmd_ctx *cmdctx;
    struct nss_dom_ctx *dctx;
    char *netgr_shortname;
    struct getent_ctx *netgr;
    const char *rawname;
};
static errno_t setnetgrent_retry(struct tevent_req *req);
static errno_t lookup_netgr_step(struct setent_step_ctx *step_ctx);
static struct tevent_req *setnetgrent_send(TALLOC_CTX *mem_ctx,
                                           const char *rawname,
                                           struct nss_cmd_ctx *cmdctx)
{
    char *domname;
    errno_t ret;
    struct tevent_req *req;
    struct setnetgrent_ctx *state;
    struct nss_dom_ctx *dctx;

    struct cli_ctx *client = cmdctx->cctx;
    struct nss_ctx *nctx =
            talloc_get_type(client->rctx->pvt_ctx, struct nss_ctx);

    req = tevent_req_create(mem_ctx, &state, struct setnetgrent_ctx);
    if (!req) {
        DEBUG(0, ("Could not create tevent request for setnetgrent\n"));
        return NULL;
    }

    state->nctx = nctx;
    state->cmdctx = cmdctx;
    state->rawname = rawname;

    state->dctx = talloc_zero(state, struct nss_dom_ctx);
    if (!state->dctx) {
        ret = ENOMEM;
        goto error;
    }
    dctx = state->dctx;
    dctx->cmdctx = state->cmdctx;

    ret = sss_parse_name(state, client->rctx->names, rawname,
                         &domname, &state->netgr_shortname);
    if (ret != EOK) {
        DEBUG(2, ("Invalid name received [%s]\n", rawname));
        goto error;
    }

    DEBUG(4, ("Requesting info for netgroup [%s] from [%s]\n",
              state->netgr_shortname, domname?domname:"<ALL>"));

    if (domname) {
        dctx->domain = responder_get_domain(dctx, client->rctx, domname);
        if (!dctx->domain) {
            ret = EINVAL;
            goto error;
        }

        /* Save the netgroup name for getnetgrent */
        client->netgr_name = talloc_strdup(client, rawname);
        if (!client->netgr_name) {
            ret = ENOMEM;
            goto error;
        }
    } else {
        /* this is a multidomain search */
        dctx->domain = client->rctx->domains;
        cmdctx->check_next = true;

        /* Save the netgroup name for getnetgrent */
        client->netgr_name = talloc_strdup(client, state->netgr_shortname);
        if (!client->netgr_name) {
            ret = ENOMEM;
            goto error;
        }
    }

    ret = setnetgrent_retry(req);
    if (ret != EOK) {
        if (ret == EAGAIN) {
            /* We need to reenter the mainloop
             * We may be refreshing the cache
             */
            return req;
        }

        goto error;
    }

    return req;

error:
    tevent_req_error(req, ret);
    tevent_req_post(req, cmdctx->cctx->ev);
    return req;
}

static errno_t setnetgrent_retry(struct tevent_req *req)
{
    errno_t ret;
    struct setent_step_ctx *step_ctx;
    struct setnetgrent_ctx *state;
    struct cli_ctx *client;
    struct nss_ctx *nctx;
    struct nss_cmd_ctx *cmdctx;
    struct nss_dom_ctx *dctx;

    state = tevent_req_data(req, struct setnetgrent_ctx);
    dctx = state->dctx;
    cmdctx = state->cmdctx;
    client = cmdctx->cctx;
    nctx = talloc_get_type(client->rctx->pvt_ctx, struct nss_ctx);

    dctx->check_provider = NEED_CHECK_PROVIDER(dctx->domain->provider);

    /* Is the result context already available?
     * Check for existing lookups for this netgroup
     */
    ret = get_netgroup_entry(nctx, client->netgr_name, &state->netgr);
    if (ret == EOK) {
        /* Another process already requested this netgroup
         * Check whether it's ready for processing.
         */
        if (state->netgr->ready) {
            if (state->netgr->found) {
                /* Ready to process results */
                tevent_req_done(req);
            } else {
                tevent_req_error(req, ENOENT);
            }

            tevent_req_post(req, nctx->rctx->ev);
            /* Return EOK, otherwise this will be treated as
             * an error
             */
            return EOK;
        }

        /* Result object is still being constructed
         * Register for notification when it's ready
         */
        ret = nss_setent_add_ref(state, state->netgr, req);
        if (ret != EOK) {
            goto done;
        }
        /* Will return control below */
    } else if (ret == ENOENT) {
        /* This is the first attempt to request this netgroup
         */
        state->netgr = talloc_zero(nctx, struct getent_ctx);
        if (!state->netgr) {
            ret = ENOMEM;
            goto done;
        }
        dctx->netgr = state->netgr;

        /* Save the name used for the lookup table
         * so we can remove it in the destructor
         */
        state->netgr->name = talloc_strdup(state->netgr,
                                           client->netgr_name);
        if (!state->netgr->name) {
            talloc_free(state->netgr);
            ret = ENOMEM;
            goto done;
        }

        state->netgr->lookup_table = nctx->netgroups;

        /* Add a reference for ourselves */
        ret = nss_setent_add_ref(state, state->netgr, req);
        if (ret != EOK) {
            talloc_free(state->netgr);
            goto done;
        }

        ret = set_netgroup_entry(nctx, state->netgr);
        if (ret != EOK) {
            DEBUG(1, ("set_netgroup_entry failed.\n"));
            talloc_free(state->netgr);
            goto done;
        }

        /* Perform lookup */
        step_ctx = talloc_zero(state->netgr, struct setent_step_ctx);
        if (!step_ctx) {
            ret = ENOMEM;
            goto done;
        }

        /* Steal the dom_ctx onto the step_ctx so it doesn't go out of scope if
         * this request is canceled while other requests are in-progress.
         */
        step_ctx->dctx = talloc_steal(step_ctx, state->dctx);
        step_ctx->nctx = state->nctx;
        step_ctx->getent_ctx = state->netgr;
        step_ctx->rctx = client->rctx;
        step_ctx->check_next = cmdctx->check_next;
        step_ctx->name =
                talloc_strdup(step_ctx, state->netgr->name);
        if (!step_ctx->name) {
            ret = ENOMEM;
            goto done;
        }

        ret = lookup_netgr_step(step_ctx);
        if (ret != EOK) {
            goto done;
        }
        tevent_req_done(req);
        tevent_req_post(req, cmdctx->cctx->ev);
        /* Will return control below */
    } else {
        /* Unexpected error from hash_lookup */
        goto done;
    }

    ret = EOK;

done:
    return ret;
}

static void lookup_netgr_dp_callback(uint16_t err_maj, uint32_t err_min,
                                     const char *err_msg, void *ptr);

static void setnetgrent_result_timeout(struct tevent_context *ev,
                                       struct tevent_timer *te,
                                       struct timeval current_time,
                                       void *pvt);

/* Set up a lifetime timer for this result object
 * We don't want this result object to outlive the
 * entry cache refresh timeout
 */
static void set_netgr_lifetime(uint32_t lifetime,
                               struct setent_step_ctx *step_ctx,
                               struct getent_ctx *netgr)
{
    struct timeval tv;
    struct tevent_timer *te;

    tv = tevent_timeval_current_ofs(lifetime, 0);
    te = tevent_add_timer(step_ctx->nctx->rctx->ev,
                          step_ctx->nctx->gctx, tv,
                          setnetgrent_result_timeout,
                          netgr);
    if (!te) {
        DEBUG(0, ("Could not set up life timer for setnetgrent result object. "
                  "Entries may become stale.\n"));
    }
}

static errno_t lookup_netgr_step(struct setent_step_ctx *step_ctx)
{
    errno_t ret;
    struct sss_domain_info *dom = step_ctx->dctx->domain;
    struct getent_ctx *netgr;
    struct sysdb_ctx *sysdb;
    char *name = NULL;
    uint32_t lifetime;

    /* Check each domain for this netgroup name */
    while (dom) {
        /* if it is a domainless search, skip domains that require fully
         * qualified names instead */
        while (dom && step_ctx->check_next && dom->fqnames) {
            dom = dom->next;
        }

        /* No domains left to search */
        if (!dom) break;

        if (dom != step_ctx->dctx->domain) {
            /* make sure we reset the check_provider flag when we check
             * a new domain */
            step_ctx->dctx->check_provider =
                    NEED_CHECK_PROVIDER(dom->provider);
        }

        /* make sure to update the dctx if we changed domain */
        step_ctx->dctx->domain = dom;

        talloc_free(name);
        name = sss_get_cased_name(step_ctx, step_ctx->name,
                                  dom->case_sensitive);
        if (!name) {
            DEBUG(SSSDBG_CRIT_FAILURE, ("sss_get_cased_name failed\n"));
            return ENOMEM;
        }

        DEBUG(4, ("Requesting info for [%s@%s]\n",
                  name, dom->name));
        sysdb = dom->sysdb;
        if (sysdb == NULL) {
            DEBUG(0, ("Fatal: Sysdb CTX not found for this domain!\n"));
            return EIO;
        }

        /* Look up the netgroup in the cache */
        ret = sysdb_getnetgr(step_ctx->dctx, sysdb, name,
                             &step_ctx->dctx->res);
        if (ret == ENOENT) {
            /* This netgroup was not found in this domain */
            if (!step_ctx->dctx->check_provider) {
                if (step_ctx->check_next) {
                    dom = dom->next;
                    continue;
                }
                else break;
            }
            ret = EOK;
        }

        if (ret != EOK) {
            DEBUG(1, ("Failed to make request to our cache!\n"));
            return EIO;
        }

        ret = get_netgroup_entry(step_ctx->nctx, step_ctx->name,
                                 &netgr);
        if (ret != EOK) {
            /* Something really bad happened! */
            DEBUG(0, ("Netgroup entry was lost!\n"));
            return ret;
        }

        /* Convert the result to a list of entries */
        ret = sysdb_netgr_to_entries(netgr, step_ctx->dctx->res,
                                     &netgr->entries);
        if (ret == ENOENT) {
            /* This netgroup was not found in this domain */
            DEBUG(2, ("No results for netgroup %s (domain %s)\n",
                      name, dom->name));

            if (!step_ctx->dctx->check_provider) {
                if (step_ctx->check_next) {
                    dom = dom->next;
                    continue;
                }
                else break;
            }
            ret = EOK;
        }

        if (ret != EOK) {
            DEBUG(1, ("Failed to convert results into entries\n"));
            netgr->ready = true;
            netgr->found = false;
            set_netgr_lifetime(step_ctx->nctx->neg_timeout, step_ctx, netgr);
            return EIO;
        }

        /* if this is a caching provider (or if we haven't checked the cache
         * yet) then verify that the cache is uptodate */
        if (step_ctx->dctx->check_provider) {
            ret = check_cache(step_ctx->dctx,
                              step_ctx->nctx,
                              step_ctx->dctx->res,
                              SSS_DP_NETGR,
                              name, 0,
                              lookup_netgr_dp_callback,
                              step_ctx);
            if (ret != EOK) {
                /* May return EAGAIN legitimately to indicate that
                 * we need to reenter the mainloop
                 */
                return ret;
            }
        }

        /* Results found */
        DEBUG(6, ("Returning info for netgroup [%s@%s]\n",
                  name, dom->name));
        netgr->ready = true;
        netgr->found = true;
        if (step_ctx->nctx->cache_refresh_percent) {
            lifetime = dom->netgroup_timeout *
                (step_ctx->nctx->cache_refresh_percent / 100);
        } else {
            lifetime = dom->netgroup_timeout;
        }
        if (lifetime < 10) lifetime = 10;
        set_netgr_lifetime(lifetime, step_ctx, netgr);
        return EOK;
    }

    /* If we've gotten here, then no domain contained this netgroup */
    DEBUG(SSSDBG_MINOR_FAILURE,
          ("No matching domain found for [%s], fail!\n", step_ctx->name));

    netgr = talloc_zero(step_ctx->nctx, struct getent_ctx);
    if (netgr == NULL) {
        DEBUG(1, ("talloc_zero failed, ignored.\n"));
    } else {
        netgr->ready = true;
        netgr->found = false;
        netgr->entries = NULL;
        netgr->lookup_table = step_ctx->nctx->netgroups;
        netgr->name = talloc_strdup(netgr, step_ctx->name);
        if (netgr->name == NULL) {
            DEBUG(1, ("talloc_strdup failed.\n"));
            talloc_free(netgr);
            return ENOMEM;
        }

        ret = set_netgroup_entry(step_ctx->nctx, netgr);
        if (ret != EOK) {
            DEBUG(1, ("set_netgroup_entry failed, ignored.\n"));
        }
        set_netgr_lifetime(step_ctx->nctx->neg_timeout, step_ctx, netgr);
    }

    return ENOENT;
}

static void lookup_netgr_dp_callback(uint16_t err_maj, uint32_t err_min,
                                     const char *err_msg, void *ptr)
{
    struct setent_step_ctx *step_ctx =
            talloc_get_type(ptr, struct setent_step_ctx);
    struct nss_dom_ctx *dctx = step_ctx->dctx;
    struct nss_cmd_ctx *cmdctx = dctx->cmdctx;
    int ret;

    if (err_maj) {
        DEBUG(2, ("Unable to get information from Data Provider\n"
                  "Error: %u, %u, %s\n"
                  "Will try to return what we have in cache\n",
                  (unsigned int)err_maj, (unsigned int)err_min, err_msg));
        /* Loop to the next domain if possible */
        if (dctx->domain->next && cmdctx->check_next) {
            dctx->domain = dctx->domain->next;
            dctx->check_provider = NEED_CHECK_PROVIDER(dctx->domain->provider);
        }
    }

    /* ok the backend returned, search to see if we have updated results */
    ret = lookup_netgr_step(step_ctx);
    if (ret != EOK) {
        if (ret == EAGAIN) {
            return;
        }
    }

    /* We have results to return */
    nss_setent_notify_error(dctx->netgr, ret);
}

static void setnetgrent_result_timeout(struct tevent_context *ev,
                                       struct tevent_timer *te,
                                       struct timeval current_time,
                                       void *pvt)
{
    struct getent_ctx *netgr =
            talloc_get_type(pvt, struct getent_ctx);

    /* Free the netgroup result context
     * The destructor for the netgroup will remove itself
     * from the hash table
     *
     * If additional getnetgrent() requests come in, they
     * will invoke an implicit setnetgrent() call and
     * refresh the result object
     */
    talloc_free(netgr);
}

static errno_t setnetgrent_recv(struct tevent_req *req)
{
    TEVENT_REQ_RETURN_ON_ERROR(req);
    return EOK;
}

static void nss_cmd_setnetgrent_done(struct tevent_req *req)
{
    errno_t reqret;
    errno_t ret;
    struct sss_packet *packet;
    uint8_t *body;
    size_t blen;

    struct nss_cmd_ctx *cmdctx =
            tevent_req_callback_data(req, struct nss_cmd_ctx);

    reqret = setnetgrent_recv(req);
    talloc_zfree(req);
    if (reqret != EOK && reqret != ENOENT) {
        DEBUG(1, ("setnetgrent failed\n"));
        nss_cmd_done(cmdctx, reqret);
        return;
    }

    /* Either we succeeded or no domains were eligible */
    ret = sss_packet_new(cmdctx->cctx->creq, 0,
                         sss_packet_get_cmd(cmdctx->cctx->creq->in),
                         &cmdctx->cctx->creq->out);
    if (ret == EOK) {
        if (reqret == ENOENT) {
            /* Notify the caller that this entry wasn't found */
            sss_cmd_empty_packet(cmdctx->cctx->creq->out);
        } else {
            packet = cmdctx->cctx->creq->out;
            ret = sss_packet_grow(packet, 2*sizeof(uint32_t));
            if (ret != EOK) {
                DEBUG(1, ("Couldn't grow the packet\n"));
                NSS_CMD_FATAL_ERROR(cmdctx);
            }

            sss_packet_get_body(packet, &body, &blen);
            ((uint32_t *)body)[0] = 1; /* Got some results */
            ((uint32_t *)body)[1] = 0; /* reserved */
        }

        sss_cmd_done(cmdctx->cctx, NULL);
        return;
    }

    DEBUG(1, ("Error creating packet\n"));
}

static void setnetgrent_implicit_done(struct tevent_req *req);
static errno_t nss_cmd_getnetgrent_process(struct nss_cmd_ctx *cmdctx,
                                           struct getent_ctx *netgr);
int nss_cmd_getnetgrent(struct cli_ctx *client)
{
    errno_t ret;
    struct nss_ctx *nctx;
    struct nss_cmd_ctx *cmdctx;
    struct getent_ctx *netgr;
    struct tevent_req *req;

    DEBUG(4, ("Requesting netgroup data\n"));

    cmdctx = talloc_zero(client, struct nss_cmd_ctx);
    if (!cmdctx) {
        return ENOMEM;
    }
    cmdctx->cctx = client;

    nctx = talloc_get_type(client->rctx->pvt_ctx, struct nss_ctx);

    if (!client->netgr_name) {
        /* Tried to run getnetgrent without a preceding
         * setnetgrent. There is no way to determine which
         * netgroup is being requested.
         */
        return nss_cmd_done(cmdctx, EINVAL);
    }

    /* Look up the results from the hash */
    ret = get_netgroup_entry(nctx, client->netgr_name, &netgr);
    if (ret == ENOENT) {
        /* We need to invoke an implicit setnetgrent() to
         * wait for the result object to become available.
         */

        req = setnetgrent_send(cmdctx, client->netgr_name, cmdctx);
        if (!req) {
            return nss_cmd_done(cmdctx, EIO);
        }
        tevent_req_set_callback(req, setnetgrent_implicit_done, cmdctx);

        return EOK;
    } else if (ret != EOK) {
        DEBUG(1, ("An unexpected error occurred: [%d][%s]\n",
                  ret, strerror(ret)));

        return nss_cmd_done(cmdctx, ret);
    }

    /* Hash entry was found. Is it ready? */
    if (!netgr->ready) {
        /* We need to invoke an implicit setnetgrent() to
         * wait for the result object to become available.
         */
        req = setnetgrent_send(cmdctx, client->netgr_name, cmdctx);
        if (!req) {
            return nss_cmd_done(cmdctx, EIO);
        }
        tevent_req_set_callback(req, setnetgrent_implicit_done, cmdctx);

        return EOK;
    } else if (!netgr->found) {
        DEBUG(6, ("Results for [%s] not found.\n", client->netgr_name));
        return ENOENT;
    }

    DEBUG(6, ("Returning results for [%s]\n", client->netgr_name));

    /* Read the result strings */
    ret = nss_cmd_getnetgrent_process(cmdctx, netgr);
    if (ret != EOK) {
        DEBUG(1, ("Failed: [%d][%s]\n", ret, strerror(ret)));
    }
    return ret;
}

static void setnetgrent_implicit_done(struct tevent_req *req)
{
    errno_t ret;
    struct getent_ctx *netgr;
    struct nss_cmd_ctx *cmdctx =
            tevent_req_callback_data(req, struct nss_cmd_ctx);
    struct nss_ctx *nctx =
            talloc_get_type(cmdctx->cctx->rctx->pvt_ctx, struct nss_ctx);

    ret = setnetgrent_recv(req);
    talloc_zfree(req);

    /* ENOENT is acceptable, it just means there were no values
     * to be returned. This will be handled gracefully in
     * nss_cmd_retnetgrent later
     */
    if (ret != EOK && ret != ENOENT) {
        DEBUG(0, ("Implicit setnetgrent failed with unexpected error "
                  "[%d][%s]\n", ret, strerror(ret)));
        NSS_CMD_FATAL_ERROR(cmdctx);
    }

    if (ret == ENOENT) {
        /* No entries found for this netgroup */
        nss_cmd_done(cmdctx, ret);
        return;
    }

    /* Look up the results from the hash */
    ret = get_netgroup_entry(nctx, cmdctx->cctx->netgr_name, &netgr);
    if (ret == ENOENT) {
        /* Critical error. This should never happen */
        DEBUG(0, ("Implicit setnetgrent returned success without creating "
                  "result object.\n"));
        NSS_CMD_FATAL_ERROR(cmdctx);
    } else if (ret != EOK) {
        DEBUG(1, ("An unexpected error occurred: [%d][%s]\n",
                  ret, strerror(ret)));

        NSS_CMD_FATAL_ERROR(cmdctx);
    }

    if (!netgr->ready) {
        /* Critical error. This should never happen */
        DEBUG(0, ("Implicit setnetgrent returned success without creating "
                  "result object.\n"));
        NSS_CMD_FATAL_ERROR(cmdctx);
    }

    ret = nss_cmd_getnetgrent_process(cmdctx, netgr);
    if (ret != EOK) {
        DEBUG(0, ("Immediate retrieval failed with unexpected error "
                  "[%d][%s]\n", ret, strerror(ret)));
        NSS_CMD_FATAL_ERROR(cmdctx);
    }
}

static errno_t nss_cmd_retnetgrent(struct cli_ctx *client,
                                   struct sysdb_netgroup_ctx **entries,
                                   int num);
static errno_t nss_cmd_getnetgrent_process(struct nss_cmd_ctx *cmdctx,
                                           struct getent_ctx *netgr)
{
    struct cli_ctx *client = cmdctx->cctx;
    uint8_t *body;
    size_t blen;
    uint32_t num;
    errno_t ret;

    /* get max num of entries to return in one call */
    sss_packet_get_body(client->creq->in, &body, &blen);
    if (blen != sizeof(uint32_t)) {
        return EINVAL;
    }
    num = *((uint32_t *)body);

    /* create response packet */
    ret = sss_packet_new(client->creq, 0,
                         sss_packet_get_cmd(client->creq->in),
                         &client->creq->out);
    if (ret != EOK) {
        return ret;
    }

    if (!netgr->entries || netgr->entries[0] == NULL) {
        /* No entries */
        DEBUG(5, ("No entries found\n"));
        ret = sss_cmd_empty_packet(client->creq->out);
        if (ret != EOK) {
            return nss_cmd_done(cmdctx, ret);
        }
        goto done;
    }

    ret = nss_cmd_retnetgrent(client, netgr->entries, num);

done:
    sss_packet_set_error(client->creq->out, ret);
    sss_cmd_done(client, cmdctx);

    return EOK;
}

static errno_t nss_cmd_retnetgrent(struct cli_ctx *client,
                                   struct sysdb_netgroup_ctx **entries,
                                   int count)
{
    size_t len;
    size_t hostlen = 0;
    size_t userlen = 0;
    size_t domainlen = 0;
    size_t grouplen = 0;
    uint8_t *body;
    size_t blen, rp;
    errno_t ret;
    struct sss_packet *packet = client->creq->out;
    int num, start;

    /* first 2 fields (len and reserved), filled up later */
    rp = 2*sizeof(uint32_t);
    ret = sss_packet_grow(packet, rp);
    if (ret != EOK) return ret;

    start = client->netgrent_cur;
    num = 0;
    while (entries[client->netgrent_cur] &&
           (client->netgrent_cur - start) < count) {
        if (entries[client->netgrent_cur]->type == SYSDB_NETGROUP_TRIPLE_VAL) {
            hostlen = 1;
            if (entries[client->netgrent_cur]->value.triple.hostname) {
                hostlen += strlen(entries[client->netgrent_cur]->value.triple.hostname);
            }

            userlen = 1;
            if (entries[client->netgrent_cur]->value.triple.username) {
                userlen += strlen(entries[client->netgrent_cur]->value.triple.username);
            }

            domainlen = 1;
            if (entries[client->netgrent_cur]->value.triple.domainname) {
                domainlen += strlen(entries[client->netgrent_cur]->value.triple.domainname);
            }

            len = sizeof(uint32_t) + hostlen + userlen + domainlen;
            ret = sss_packet_grow(packet, len);
            if (ret != EOK) {
                return ret;
            }
            sss_packet_get_body(packet, &body, &blen);

            SAFEALIGN_SET_UINT32(&body[rp], SSS_NETGR_REP_TRIPLE, &rp);

            if (hostlen == 1) {
                body[rp] = '\0';
            } else {
                memcpy(&body[rp],
                       entries[client->netgrent_cur]->value.triple.hostname,
                       hostlen);
            }
            rp += hostlen;

            if (userlen == 1) {
                body[rp] = '\0';
            } else {
                memcpy(&body[rp],
                       entries[client->netgrent_cur]->value.triple.username,
                       userlen);
            }
            rp += userlen;

            if (domainlen == 1) {
                body[rp] = '\0';
            } else {
                memcpy(&body[rp],
                       entries[client->netgrent_cur]->value.triple.domainname,
                       domainlen);
            }
            rp += domainlen;
        } else if (entries[client->netgrent_cur]->type == SYSDB_NETGROUP_GROUP_VAL) {
            if (entries[client->netgrent_cur]->value.groupname == NULL ||
                entries[client->netgrent_cur]->value.groupname[0] == '\0') {
                DEBUG(1, ("Empty netgroup member. Please check your cache.\n"));
                continue;
            }

            grouplen = 1 + strlen(entries[client->netgrent_cur]->value.groupname);

            len = sizeof(uint32_t) + grouplen;

            ret = sss_packet_grow(packet, len);
            if (ret != EOK) {
                return ret;
            }

            sss_packet_get_body(packet, &body, &blen);

            SAFEALIGN_SET_UINT32(&body[rp], SSS_NETGR_REP_GROUP, &rp);

            memcpy(&body[rp],
                   entries[client->netgrent_cur]->value.groupname,
                   grouplen);
            rp += grouplen;
        } else {
            DEBUG(1, ("Unexpected value type for netgroup entry. "
                      "Please check your cache.\n"));
            continue;
        }

        num++;
        client->netgrent_cur++;
    }

    sss_packet_get_body(packet, &body, &blen);
    ((uint32_t *)body)[0] = num; /* num results */
    ((uint32_t *)body)[1] = 0; /* reserved */

    return EOK;
}

int nss_cmd_endnetgrent(struct cli_ctx *client)
{
    errno_t ret;

    /* create response packet */
    ret = sss_packet_new(client->creq, 0,
                         sss_packet_get_cmd(client->creq->in),
                         &client->creq->out);

    if (ret != EOK) {
        return ret;
    }

    /* Reset the indices so that subsequent requests start at zero */
    client->netgrent_cur = 0;
    talloc_zfree(client->netgr_name);

    sss_cmd_done(client, NULL);
    return EOK;
}