Move source3/libads/dns.c to lib/addns
[sfrench/samba-autobuild/.git] / source3 / libsmb / dsgetdcname.c
1 /*
2    Unix SMB/CIFS implementation.
3
4    dsgetdcname
5
6    Copyright (C) Gerald Carter 2006
7    Copyright (C) Guenther Deschner 2007-2008
8
9    This program is free software; you can redistribute it and/or modify
10    it under the terms of the GNU General Public License as published by
11    the Free Software Foundation; either version 3 of the License, or
12    (at your option) any later version.
13
14    This program is distributed in the hope that it will be useful,
15    but WITHOUT ANY WARRANTY; without even the implied warranty of
16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17    GNU General Public License for more details.
18
19    You should have received a copy of the GNU General Public License
20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
21 */
22
23 #include "includes.h"
24 #include "libads/sitename_cache.h"
25 #include "../librpc/gen_ndr/ndr_netlogon.h"
26 #include "libads/cldap.h"
27 #include "../lib/addns/dnsquery.h"
28 #include "libsmb/clidgram.h"
29
30 /* 15 minutes */
31 #define DSGETDCNAME_CACHE_TTL   60*15
32
33 struct ip_service_name {
34         struct sockaddr_storage ss;
35         const char *hostname;
36 };
37
38 static NTSTATUS make_dc_info_from_cldap_reply(TALLOC_CTX *mem_ctx,
39                                               uint32_t flags,
40                                               struct sockaddr_storage *ss,
41                                               struct NETLOGON_SAM_LOGON_RESPONSE_EX *r,
42                                               struct netr_DsRGetDCNameInfo **info);
43
44 /****************************************************************
45 ****************************************************************/
46
47 void debug_dsdcinfo_flags(int lvl, uint32_t flags)
48 {
49         DEBUG(lvl,("debug_dsdcinfo_flags: 0x%08x\n\t", flags));
50
51         if (flags & DS_FORCE_REDISCOVERY)
52                 DEBUGADD(lvl,("DS_FORCE_REDISCOVERY "));
53         if (flags & 0x000000002)
54                 DEBUGADD(lvl,("0x00000002 "));
55         if (flags & 0x000000004)
56                 DEBUGADD(lvl,("0x00000004 "));
57         if (flags & 0x000000008)
58                 DEBUGADD(lvl,("0x00000008 "));
59         if (flags & DS_DIRECTORY_SERVICE_REQUIRED)
60                 DEBUGADD(lvl,("DS_DIRECTORY_SERVICE_REQUIRED "));
61         if (flags & DS_DIRECTORY_SERVICE_PREFERRED)
62                 DEBUGADD(lvl,("DS_DIRECTORY_SERVICE_PREFERRED "));
63         if (flags & DS_GC_SERVER_REQUIRED)
64                 DEBUGADD(lvl,("DS_GC_SERVER_REQUIRED "));
65         if (flags & DS_PDC_REQUIRED)
66                 DEBUGADD(lvl,("DS_PDC_REQUIRED "));
67         if (flags & DS_BACKGROUND_ONLY)
68                 DEBUGADD(lvl,("DS_BACKGROUND_ONLY "));
69         if (flags & DS_IP_REQUIRED)
70                 DEBUGADD(lvl,("DS_IP_REQUIRED "));
71         if (flags & DS_KDC_REQUIRED)
72                 DEBUGADD(lvl,("DS_KDC_REQUIRED "));
73         if (flags & DS_TIMESERV_REQUIRED)
74                 DEBUGADD(lvl,("DS_TIMESERV_REQUIRED "));
75         if (flags & DS_WRITABLE_REQUIRED)
76                 DEBUGADD(lvl,("DS_WRITABLE_REQUIRED "));
77         if (flags & DS_GOOD_TIMESERV_PREFERRED)
78                 DEBUGADD(lvl,("DS_GOOD_TIMESERV_PREFERRED "));
79         if (flags & DS_AVOID_SELF)
80                 DEBUGADD(lvl,("DS_AVOID_SELF "));
81         if (flags & DS_ONLY_LDAP_NEEDED)
82                 DEBUGADD(lvl,("DS_ONLY_LDAP_NEEDED "));
83         if (flags & DS_IS_FLAT_NAME)
84                 DEBUGADD(lvl,("DS_IS_FLAT_NAME "));
85         if (flags & DS_IS_DNS_NAME)
86                 DEBUGADD(lvl,("DS_IS_DNS_NAME "));
87         if (flags & 0x00040000)
88                 DEBUGADD(lvl,("0x00040000 "));
89         if (flags & 0x00080000)
90                 DEBUGADD(lvl,("0x00080000 "));
91         if (flags & 0x00100000)
92                 DEBUGADD(lvl,("0x00100000 "));
93         if (flags & 0x00200000)
94                 DEBUGADD(lvl,("0x00200000 "));
95         if (flags & 0x00400000)
96                 DEBUGADD(lvl,("0x00400000 "));
97         if (flags & 0x00800000)
98                 DEBUGADD(lvl,("0x00800000 "));
99         if (flags & 0x01000000)
100                 DEBUGADD(lvl,("0x01000000 "));
101         if (flags & 0x02000000)
102                 DEBUGADD(lvl,("0x02000000 "));
103         if (flags & 0x04000000)
104                 DEBUGADD(lvl,("0x04000000 "));
105         if (flags & 0x08000000)
106                 DEBUGADD(lvl,("0x08000000 "));
107         if (flags & 0x10000000)
108                 DEBUGADD(lvl,("0x10000000 "));
109         if (flags & 0x20000000)
110                 DEBUGADD(lvl,("0x20000000 "));
111         if (flags & DS_RETURN_DNS_NAME)
112                 DEBUGADD(lvl,("DS_RETURN_DNS_NAME "));
113         if (flags & DS_RETURN_FLAT_NAME)
114                 DEBUGADD(lvl,("DS_RETURN_FLAT_NAME "));
115         if (flags)
116                 DEBUGADD(lvl,("\n"));
117 }
118
119 /****************************************************************
120 ****************************************************************/
121
122 static char *dsgetdcname_cache_key(TALLOC_CTX *mem_ctx, const char *domain)
123 {
124         if (!domain) {
125                 return NULL;
126         }
127
128         return talloc_asprintf_strupper_m(mem_ctx, "DSGETDCNAME/DOMAIN/%s",
129                                           domain);
130 }
131
132 /****************************************************************
133 ****************************************************************/
134
135 static NTSTATUS dsgetdcname_cache_delete(TALLOC_CTX *mem_ctx,
136                                         const char *domain_name)
137 {
138         char *key;
139
140         key = dsgetdcname_cache_key(mem_ctx, domain_name);
141         if (!key) {
142                 return NT_STATUS_NO_MEMORY;
143         }
144
145         if (!gencache_del(key)) {
146                 return NT_STATUS_UNSUCCESSFUL;
147         }
148
149         return NT_STATUS_OK;
150 }
151
152 /****************************************************************
153 ****************************************************************/
154
155 static NTSTATUS dsgetdcname_cache_store(TALLOC_CTX *mem_ctx,
156                                         const char *domain_name,
157                                         const DATA_BLOB *blob)
158 {
159         time_t expire_time;
160         char *key;
161         bool ret = false;
162
163         key = dsgetdcname_cache_key(mem_ctx, domain_name);
164         if (!key) {
165                 return NT_STATUS_NO_MEMORY;
166         }
167
168         expire_time = time(NULL) + DSGETDCNAME_CACHE_TTL;
169
170         ret = gencache_set_data_blob(key, blob, expire_time);
171
172         return ret ? NT_STATUS_OK : NT_STATUS_UNSUCCESSFUL;
173 }
174
175 /****************************************************************
176 ****************************************************************/
177
178 static NTSTATUS store_cldap_reply(TALLOC_CTX *mem_ctx,
179                                   uint32_t flags,
180                                   struct sockaddr_storage *ss,
181                                   uint32_t nt_version,
182                                   struct NETLOGON_SAM_LOGON_RESPONSE_EX *r)
183 {
184         DATA_BLOB blob;
185         enum ndr_err_code ndr_err;
186         NTSTATUS status;
187         char addr[INET6_ADDRSTRLEN];
188
189        print_sockaddr(addr, sizeof(addr), ss);
190
191         /* FIXME */
192         r->sockaddr_size = 0x10; /* the w32 winsock addr size */
193         r->sockaddr.sockaddr_family = 2; /* AF_INET */
194         r->sockaddr.pdc_ip = talloc_strdup(mem_ctx, addr);
195
196         ndr_err = ndr_push_struct_blob(&blob, mem_ctx, r,
197                        (ndr_push_flags_fn_t)ndr_push_NETLOGON_SAM_LOGON_RESPONSE_EX);
198         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
199                 return ndr_map_error2ntstatus(ndr_err);
200         }
201
202         if (r->domain_name) {
203                 status = dsgetdcname_cache_store(mem_ctx, r->domain_name, &blob);
204                 if (!NT_STATUS_IS_OK(status)) {
205                         goto done;
206                 }
207                 if (r->client_site) {
208                         sitename_store(r->domain_name, r->client_site);
209                 }
210         }
211         if (r->dns_domain) {
212                 status = dsgetdcname_cache_store(mem_ctx, r->dns_domain, &blob);
213                 if (!NT_STATUS_IS_OK(status)) {
214                         goto done;
215                 }
216                 if (r->client_site) {
217                         sitename_store(r->dns_domain, r->client_site);
218                 }
219         }
220
221         status = NT_STATUS_OK;
222
223  done:
224         data_blob_free(&blob);
225
226         return status;
227 }
228
229 /****************************************************************
230 ****************************************************************/
231
232 static uint32_t get_cldap_reply_server_flags(struct netlogon_samlogon_response *r,
233                                              uint32_t nt_version)
234 {
235         switch (nt_version & 0x0000001f) {
236                 case 0:
237                 case 1:
238                 case 16:
239                 case 17:
240                         return 0;
241                 case 2:
242                 case 3:
243                 case 18:
244                 case 19:
245                         return r->data.nt5.server_type;
246                 case 4:
247                 case 5:
248                 case 6:
249                 case 7:
250                         return r->data.nt5_ex.server_type;
251                 case 8:
252                 case 9:
253                 case 10:
254                 case 11:
255                 case 12:
256                 case 13:
257                 case 14:
258                 case 15:
259                         return r->data.nt5_ex.server_type;
260                 case 20:
261                 case 21:
262                 case 22:
263                 case 23:
264                 case 24:
265                 case 25:
266                 case 26:
267                 case 27:
268                 case 28:
269                         return r->data.nt5_ex.server_type;
270                 case 29:
271                 case 30:
272                 case 31:
273                         return r->data.nt5_ex.server_type;
274                 default:
275                         return 0;
276         }
277 }
278
279 /****************************************************************
280 ****************************************************************/
281
282 #define RETURN_ON_FALSE(x) if (!(x)) return false;
283
284 static bool check_cldap_reply_required_flags(uint32_t ret_flags,
285                                              uint32_t req_flags)
286 {
287         if (ret_flags == 0) {
288                 return true;
289         }
290
291         if (req_flags & DS_PDC_REQUIRED)
292                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_PDC);
293
294         if (req_flags & DS_GC_SERVER_REQUIRED)
295                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_GC);
296
297         if (req_flags & DS_ONLY_LDAP_NEEDED)
298                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_LDAP);
299
300         if ((req_flags & DS_DIRECTORY_SERVICE_REQUIRED) ||
301             (req_flags & DS_DIRECTORY_SERVICE_PREFERRED))
302                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_DS);
303
304         if (req_flags & DS_KDC_REQUIRED)
305                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_KDC);
306
307         if (req_flags & DS_TIMESERV_REQUIRED)
308                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_TIMESERV);
309
310         if (req_flags & DS_WRITABLE_REQUIRED)
311                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_WRITABLE);
312
313         return true;
314 }
315
316 /****************************************************************
317 ****************************************************************/
318
319 static NTSTATUS dsgetdcname_cache_fetch(TALLOC_CTX *mem_ctx,
320                                         const char *domain_name,
321                                         const struct GUID *domain_guid,
322                                         uint32_t flags,
323                                         const char *site_name,
324                                         struct netr_DsRGetDCNameInfo **info_p)
325 {
326         char *key;
327         DATA_BLOB blob;
328         enum ndr_err_code ndr_err;
329         struct netr_DsRGetDCNameInfo *info;
330         struct NETLOGON_SAM_LOGON_RESPONSE_EX r;
331         NTSTATUS status;
332
333         key = dsgetdcname_cache_key(mem_ctx, domain_name);
334         if (!key) {
335                 return NT_STATUS_NO_MEMORY;
336         }
337
338         if (!gencache_get_data_blob(key, &blob, NULL, NULL)) {
339                 return NT_STATUS_NOT_FOUND;
340         }
341
342         info = talloc_zero(mem_ctx, struct netr_DsRGetDCNameInfo);
343         if (!info) {
344                 return NT_STATUS_NO_MEMORY;
345         }
346
347         ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, &r,
348                       (ndr_pull_flags_fn_t)ndr_pull_NETLOGON_SAM_LOGON_RESPONSE_EX);
349
350         data_blob_free(&blob);
351         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
352                 dsgetdcname_cache_delete(mem_ctx, domain_name);
353                 return ndr_map_error2ntstatus(ndr_err);
354         }
355
356         status = make_dc_info_from_cldap_reply(mem_ctx, flags, NULL,
357                                                &r, &info);
358         if (!NT_STATUS_IS_OK(status)) {
359                 return status;
360         }
361
362         if (DEBUGLEVEL >= 10) {
363                 NDR_PRINT_DEBUG(netr_DsRGetDCNameInfo, info);
364         }
365
366         /* check flags */
367         if (!check_cldap_reply_required_flags(info->dc_flags, flags)) {
368                 DEBUG(10,("invalid flags\n"));
369                 return NT_STATUS_INVALID_PARAMETER;
370         }
371
372         if ((flags & DS_IP_REQUIRED) &&
373             (info->dc_address_type != DS_ADDRESS_TYPE_INET)) {
374                 return NT_STATUS_INVALID_PARAMETER_MIX;
375         }
376
377         *info_p = info;
378
379         return NT_STATUS_OK;
380 }
381
382 /****************************************************************
383 ****************************************************************/
384
385 static NTSTATUS dsgetdcname_cached(TALLOC_CTX *mem_ctx,
386                                    struct messaging_context *msg_ctx,
387                                    const char *domain_name,
388                                    const struct GUID *domain_guid,
389                                    uint32_t flags,
390                                    const char *site_name,
391                                    struct netr_DsRGetDCNameInfo **info)
392 {
393         NTSTATUS status;
394
395         status = dsgetdcname_cache_fetch(mem_ctx, domain_name, domain_guid,
396                                          flags, site_name, info);
397         if (!NT_STATUS_IS_OK(status)
398             && !NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
399                 DEBUG(10,("dsgetdcname_cached: cache fetch failed with: %s\n",
400                         nt_errstr(status)));
401                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
402         }
403
404         if (flags & DS_BACKGROUND_ONLY) {
405                 return status;
406         }
407
408         if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
409                 struct netr_DsRGetDCNameInfo *dc_info;
410
411                 status = dsgetdcname(mem_ctx, msg_ctx, domain_name,
412                                      domain_guid, site_name,
413                                      flags | DS_FORCE_REDISCOVERY,
414                                      &dc_info);
415
416                 if (!NT_STATUS_IS_OK(status)) {
417                         return status;
418                 }
419
420                 *info = dc_info;
421         }
422
423         return status;
424 }
425
426 /****************************************************************
427 ****************************************************************/
428
429 static bool check_allowed_required_flags(uint32_t flags,
430                                          const char *site_name)
431 {
432         uint32_t return_type = flags & (DS_RETURN_FLAT_NAME|DS_RETURN_DNS_NAME);
433         uint32_t offered_type = flags & (DS_IS_FLAT_NAME|DS_IS_DNS_NAME);
434         uint32_t query_type = flags & (DS_BACKGROUND_ONLY|DS_FORCE_REDISCOVERY);
435
436         /* FIXME: check for DSGETDC_VALID_FLAGS and check for excluse bits
437          * (DS_PDC_REQUIRED, DS_KDC_REQUIRED, DS_GC_SERVER_REQUIRED) */
438
439         debug_dsdcinfo_flags(10, flags);
440
441         if ((flags & DS_TRY_NEXTCLOSEST_SITE) && site_name) {
442                 return false;
443         }
444
445         if (return_type == (DS_RETURN_FLAT_NAME|DS_RETURN_DNS_NAME)) {
446                 return false;
447         }
448
449         if (offered_type == (DS_IS_DNS_NAME|DS_IS_FLAT_NAME)) {
450                 return false;
451         }
452
453         if (query_type == (DS_BACKGROUND_ONLY|DS_FORCE_REDISCOVERY)) {
454                 return false;
455         }
456
457 #if 0
458         if ((flags & DS_RETURN_DNS_NAME) && (!(flags & DS_IP_REQUIRED))) {
459                 printf("gd: here5 \n");
460                 return false;
461         }
462 #endif
463         return true;
464 }
465
466 /****************************************************************
467 ****************************************************************/
468
469 static NTSTATUS discover_dc_netbios(TALLOC_CTX *mem_ctx,
470                                     const char *domain_name,
471                                     uint32_t flags,
472                                     struct ip_service_name **returned_dclist,
473                                     int *returned_count)
474 {
475         NTSTATUS status;
476         enum nbt_name_type name_type = NBT_NAME_LOGON;
477         struct ip_service *iplist;
478         int i;
479         struct ip_service_name *dclist = NULL;
480         int count;
481
482         *returned_dclist = NULL;
483         *returned_count = 0;
484
485         if (lp_disable_netbios()) {
486                 return NT_STATUS_NOT_SUPPORTED;
487         }
488
489         if (flags & DS_PDC_REQUIRED) {
490                 name_type = NBT_NAME_PDC;
491         }
492
493         status = internal_resolve_name(domain_name, name_type, NULL,
494                                        &iplist, &count,
495                                        "lmhosts wins bcast");
496         if (!NT_STATUS_IS_OK(status)) {
497                 DEBUG(10,("discover_dc_netbios: failed to find DC\n"));
498                 return status;
499         }
500
501         dclist = talloc_zero_array(mem_ctx, struct ip_service_name, count);
502         if (!dclist) {
503                 SAFE_FREE(iplist);
504                 return NT_STATUS_NO_MEMORY;
505         }
506
507         for (i=0; i<count; i++) {
508
509                 char addr[INET6_ADDRSTRLEN];
510                 struct ip_service_name *r = &dclist[i];
511
512                 print_sockaddr(addr, sizeof(addr),
513                                &iplist[i].ss);
514
515                 r->ss   = iplist[i].ss;
516                 r->hostname = talloc_strdup(mem_ctx, addr);
517                 if (!r->hostname) {
518                         SAFE_FREE(iplist);
519                         return NT_STATUS_NO_MEMORY;
520                 }
521
522         }
523
524         *returned_dclist = dclist;
525         *returned_count = count;
526         SAFE_FREE(iplist);
527
528         return NT_STATUS_OK;
529 }
530
531 /****************************************************************
532 ****************************************************************/
533
534 static NTSTATUS discover_dc_dns(TALLOC_CTX *mem_ctx,
535                                 const char *domain_name,
536                                 const struct GUID *domain_guid,
537                                 uint32_t flags,
538                                 const char *site_name,
539                                 struct ip_service_name **returned_dclist,
540                                 int *return_count)
541 {
542         int i, j;
543         NTSTATUS status;
544         struct dns_rr_srv *dcs = NULL;
545         int numdcs = 0;
546         int numaddrs = 0;
547         struct ip_service_name *dclist = NULL;
548         int count = 0;
549         const char *dns_hosts_file;
550         char *guid_string;
551
552         dns_hosts_file = lp_parm_const_string(-1, "resolv", "host file", NULL);
553         if (flags & DS_PDC_REQUIRED) {
554                 status = ads_dns_query_pdc(mem_ctx, dns_hosts_file,
555                                            domain_name, &dcs, &numdcs);
556         } else if (flags & DS_GC_SERVER_REQUIRED) {
557                 status = ads_dns_query_gcs(mem_ctx, dns_hosts_file,
558                                            domain_name, site_name,
559                                            &dcs, &numdcs);
560         } else if (flags & DS_KDC_REQUIRED) {
561                 status = ads_dns_query_kdcs(mem_ctx, dns_hosts_file,
562                                             domain_name, site_name,
563                                             &dcs, &numdcs);
564         } else if (flags & DS_DIRECTORY_SERVICE_REQUIRED) {
565                 status = ads_dns_query_dcs(mem_ctx, dns_hosts_file,
566                                            domain_name, site_name,
567                                            &dcs, &numdcs);
568         } else if (domain_guid) {
569                 guid_string = GUID_string(mem_ctx, domain_guid);
570                 if (!guid_string) {
571                         return NT_STATUS_NO_MEMORY;
572                 }
573
574                 status = ads_dns_query_dcs_guid(mem_ctx, dns_hosts_file,
575                                                 domain_name, guid_string,
576                                                 &dcs, &numdcs);
577                 TALLOC_FREE(guid_string);
578         } else {
579                 status = ads_dns_query_dcs(mem_ctx, dns_hosts_file,
580                                            domain_name, site_name,
581                                            &dcs, &numdcs);
582         }
583
584         if (!NT_STATUS_IS_OK(status)) {
585                 return status;
586         }
587
588         if (numdcs == 0) {
589                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
590         }
591
592         for (i=0;i<numdcs;i++) {
593                 numaddrs += MAX(dcs[i].num_ips,1);
594         }
595
596         dclist = talloc_zero_array(mem_ctx,
597                                    struct ip_service_name,
598                                    numaddrs);
599         if (!dclist) {
600                 return NT_STATUS_NO_MEMORY;
601         }
602
603         /* now unroll the list of IP addresses */
604
605         *return_count = 0;
606         i = 0;
607         j = 0;
608
609         while ((i < numdcs) && (count < numaddrs)) {
610
611                 struct ip_service_name *r = &dclist[count];
612
613                 r->hostname = dcs[i].hostname;
614
615                 /* If we don't have an IP list for a name, lookup it up */
616
617                 if (!dcs[i].ss_s) {
618                         interpret_string_addr_prefer_ipv4(&r->ss,
619                                                 dcs[i].hostname, 0);
620                         i++;
621                         j = 0;
622                 } else {
623                         /* use the IP addresses from the SRV response */
624
625                         if (j >= dcs[i].num_ips) {
626                                 i++;
627                                 j = 0;
628                                 continue;
629                         }
630
631                         r->ss = dcs[i].ss_s[j];
632                         j++;
633                 }
634
635                 /* make sure it is a valid IP.  I considered checking the
636                  * negative connection cache, but this is the wrong place for
637                  * it.  Maybe only as a hack. After think about it, if all of
638                  * the IP addresses returned from DNS are dead, what hope does a
639                  * netbios name lookup have?  The standard reason for falling
640                  * back to netbios lookups is that our DNS server doesn't know
641                  * anything about the DC's   -- jerry */
642
643                 if (!is_zero_addr(&r->ss)) {
644                         count++;
645                         continue;
646                 }
647         }
648
649         *returned_dclist = dclist;
650         *return_count = count;
651
652         if (count > 0) {
653                 return NT_STATUS_OK;
654         }
655
656         return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
657 }
658
659 /****************************************************************
660 ****************************************************************/
661
662 static NTSTATUS make_domain_controller_info(TALLOC_CTX *mem_ctx,
663                                             const char *dc_unc,
664                                             const char *dc_address,
665                                             uint32_t dc_address_type,
666                                             const struct GUID *domain_guid,
667                                             const char *domain_name,
668                                             const char *forest_name,
669                                             uint32_t flags,
670                                             const char *dc_site_name,
671                                             const char *client_site_name,
672                                             struct netr_DsRGetDCNameInfo **info_out)
673 {
674         struct netr_DsRGetDCNameInfo *info;
675
676         info = talloc_zero(mem_ctx, struct netr_DsRGetDCNameInfo);
677         NT_STATUS_HAVE_NO_MEMORY(info);
678
679         if (dc_unc) {
680                 info->dc_unc = talloc_strdup(mem_ctx, dc_unc);
681                 NT_STATUS_HAVE_NO_MEMORY(info->dc_unc);
682         }
683
684         if (dc_address) {
685                 if (!(dc_address[0] == '\\' && dc_address[1] == '\\')) {
686                         info->dc_address = talloc_asprintf(mem_ctx, "\\\\%s",
687                                                            dc_address);
688                 } else {
689                         info->dc_address = talloc_strdup(mem_ctx, dc_address);
690                 }
691                 NT_STATUS_HAVE_NO_MEMORY(info->dc_address);
692         }
693
694         info->dc_address_type = dc_address_type;
695
696         if (domain_guid) {
697                 info->domain_guid = *domain_guid;
698         }
699
700         if (domain_name) {
701                 info->domain_name = talloc_strdup(mem_ctx, domain_name);
702                 NT_STATUS_HAVE_NO_MEMORY(info->domain_name);
703         }
704
705         if (forest_name && *forest_name) {
706                 info->forest_name = talloc_strdup(mem_ctx, forest_name);
707                 NT_STATUS_HAVE_NO_MEMORY(info->forest_name);
708                 flags |= DS_DNS_FOREST_ROOT;
709         }
710
711         info->dc_flags = flags;
712
713         if (dc_site_name) {
714                 info->dc_site_name = talloc_strdup(mem_ctx, dc_site_name);
715                 NT_STATUS_HAVE_NO_MEMORY(info->dc_site_name);
716         }
717
718         if (client_site_name) {
719                 info->client_site_name = talloc_strdup(mem_ctx,
720                                                        client_site_name);
721                 NT_STATUS_HAVE_NO_MEMORY(info->client_site_name);
722         }
723
724         *info_out = info;
725
726         return NT_STATUS_OK;
727 }
728
729 /****************************************************************
730 ****************************************************************/
731
732 static void map_dc_and_domain_names(uint32_t flags,
733                                     const char *dc_name,
734                                     const char *domain_name,
735                                     const char *dns_dc_name,
736                                     const char *dns_domain_name,
737                                     uint32_t *dc_flags,
738                                     const char **hostname_p,
739                                     const char **domain_p)
740 {
741         switch (flags & 0xf0000000) {
742                 case DS_RETURN_FLAT_NAME:
743                         if (dc_name && domain_name &&
744                             *dc_name && *domain_name) {
745                                 *hostname_p = dc_name;
746                                 *domain_p = domain_name;
747                                 break;
748                         }
749                 case DS_RETURN_DNS_NAME:
750                 default:
751                         if (dns_dc_name && dns_domain_name &&
752                             *dns_dc_name && *dns_domain_name) {
753                                 *hostname_p = dns_dc_name;
754                                 *domain_p = dns_domain_name;
755                                 *dc_flags |= DS_DNS_DOMAIN | DS_DNS_CONTROLLER;
756                                 break;
757                         }
758                         if (dc_name && domain_name &&
759                             *dc_name && *domain_name) {
760                                 *hostname_p = dc_name;
761                                 *domain_p = domain_name;
762                                 break;
763                         }
764         }
765 }
766
767 /****************************************************************
768 ****************************************************************/
769
770 static NTSTATUS make_dc_info_from_cldap_reply(TALLOC_CTX *mem_ctx,
771                                               uint32_t flags,
772                                               struct sockaddr_storage *ss,
773                                               struct NETLOGON_SAM_LOGON_RESPONSE_EX *r,
774                                               struct netr_DsRGetDCNameInfo **info)
775 {
776         const char *dc_hostname = NULL;
777         const char *dc_domain_name = NULL;
778         const char *dc_address = NULL;
779         const char *dc_forest = NULL;
780         uint32_t dc_address_type = 0;
781         uint32_t dc_flags = 0;
782         struct GUID *dc_domain_guid = NULL;
783         const char *dc_server_site = NULL;
784         const char *dc_client_site = NULL;
785
786         char addr[INET6_ADDRSTRLEN];
787
788         if (ss) {
789                 print_sockaddr(addr, sizeof(addr), ss);
790                 dc_address = addr;
791                 dc_address_type = DS_ADDRESS_TYPE_INET;
792         }
793
794         if (!ss && r->sockaddr.pdc_ip) {
795                 dc_address      = r->sockaddr.pdc_ip;
796                 dc_address_type = DS_ADDRESS_TYPE_INET;
797         } else {
798                 dc_address      = r->pdc_name;
799                 dc_address_type = DS_ADDRESS_TYPE_NETBIOS;
800         }
801
802         map_dc_and_domain_names(flags,
803                                 r->pdc_name,
804                                 r->domain_name,
805                                 r->pdc_dns_name,
806                                 r->dns_domain,
807                                 &dc_flags,
808                                 &dc_hostname,
809                                 &dc_domain_name);
810
811         dc_flags        |= r->server_type;
812         dc_forest       = r->forest;
813         dc_domain_guid  = &r->domain_uuid;
814         dc_server_site  = r->server_site;
815         dc_client_site  = r->client_site;
816
817         return make_domain_controller_info(mem_ctx,
818                                            dc_hostname,
819                                            dc_address,
820                                            dc_address_type,
821                                            dc_domain_guid,
822                                            dc_domain_name,
823                                            dc_forest,
824                                            dc_flags,
825                                            dc_server_site,
826                                            dc_client_site,
827                                            info);
828 }
829
830 /****************************************************************
831 ****************************************************************/
832
833 static uint32_t map_ds_flags_to_nt_version(uint32_t flags)
834 {
835         uint32_t nt_version = 0;
836
837         if (flags & DS_PDC_REQUIRED) {
838                 nt_version |= NETLOGON_NT_VERSION_PDC;
839         }
840
841         if (flags & DS_GC_SERVER_REQUIRED) {
842                 nt_version |= NETLOGON_NT_VERSION_GC;
843         }
844
845         if (flags & DS_TRY_NEXTCLOSEST_SITE) {
846                 nt_version |= NETLOGON_NT_VERSION_WITH_CLOSEST_SITE;
847         }
848
849         if (flags & DS_IP_REQUIRED) {
850                 nt_version |= NETLOGON_NT_VERSION_IP;
851         }
852
853         return nt_version;
854 }
855
856 /****************************************************************
857 ****************************************************************/
858
859 static NTSTATUS process_dc_dns(TALLOC_CTX *mem_ctx,
860                                const char *domain_name,
861                                uint32_t flags,
862                                struct ip_service_name *dclist,
863                                int num_dcs,
864                                struct netr_DsRGetDCNameInfo **info)
865 {
866         int i = 0;
867         bool valid_dc = false;
868         struct netlogon_samlogon_response *r = NULL;
869         uint32_t nt_version = NETLOGON_NT_VERSION_5 |
870                               NETLOGON_NT_VERSION_5EX;
871         uint32_t ret_flags = 0;
872         NTSTATUS status;
873
874         nt_version |= map_ds_flags_to_nt_version(flags);
875
876         for (i=0; i<num_dcs; i++) {
877
878
879                 DEBUG(10,("LDAP ping to %s\n", dclist[i].hostname));
880
881                 if (ads_cldap_netlogon(mem_ctx, &dclist[i].ss,
882                                         domain_name,
883                                         nt_version,
884                                         &r))
885                 {
886                         nt_version = r->ntver;
887                         ret_flags = get_cldap_reply_server_flags(r, nt_version);
888
889                         if (check_cldap_reply_required_flags(ret_flags, flags)) {
890                                 valid_dc = true;
891                                 break;
892                         }
893                 }
894
895                 continue;
896         }
897
898         if (!valid_dc) {
899                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
900         }
901
902         status = make_dc_info_from_cldap_reply(mem_ctx, flags, &dclist[i].ss,
903                                                &r->data.nt5_ex, info);
904         if (NT_STATUS_IS_OK(status)) {
905                 return store_cldap_reply(mem_ctx, flags, &dclist[i].ss,
906                                          nt_version, &r->data.nt5_ex);
907         }
908
909         return status;
910 }
911
912 /****************************************************************
913 ****************************************************************/
914
915 /****************************************************************
916 ****************************************************************/
917
918 static NTSTATUS process_dc_netbios(TALLOC_CTX *mem_ctx,
919                                    struct messaging_context *msg_ctx,
920                                    const char *domain_name,
921                                    uint32_t flags,
922                                    struct ip_service_name *dclist,
923                                    int num_dcs,
924                                    struct netr_DsRGetDCNameInfo **info)
925 {
926         struct sockaddr_storage ss;
927         struct ip_service ip_list;
928         enum nbt_name_type name_type = NBT_NAME_LOGON;
929         NTSTATUS status;
930         int i;
931         const char *dc_name = NULL;
932         fstring tmp_dc_name;
933         struct netlogon_samlogon_response *r = NULL;
934         bool store_cache = false;
935         uint32_t nt_version = NETLOGON_NT_VERSION_1 |
936                               NETLOGON_NT_VERSION_5 |
937                               NETLOGON_NT_VERSION_5EX_WITH_IP;
938
939         if (msg_ctx == NULL) {
940                 return NT_STATUS_INVALID_PARAMETER;
941         }
942
943         if (flags & DS_PDC_REQUIRED) {
944                 name_type = NBT_NAME_PDC;
945         }
946
947         nt_version |= map_ds_flags_to_nt_version(flags);
948
949         DEBUG(10,("process_dc_netbios\n"));
950
951         for (i=0; i<num_dcs; i++) {
952                 uint16_t val;
953
954                 generate_random_buffer((uint8_t *)&val, 2);
955
956                 ip_list.ss = dclist[i].ss;
957                 ip_list.port = 0;
958
959                 if (!interpret_string_addr_prefer_ipv4(&ss, dclist[i].hostname, AI_NUMERICHOST)) {
960                         return NT_STATUS_UNSUCCESSFUL;
961                 }
962
963                 status = nbt_getdc(msg_ctx, 10, &dclist[i].ss, domain_name,
964                                    NULL, nt_version,
965                                    mem_ctx, &nt_version, &dc_name, &r);
966                 if (NT_STATUS_IS_OK(status)) {
967                         store_cache = true;
968                         namecache_store(dc_name, NBT_NAME_SERVER, 1, &ip_list);
969                         goto make_reply;
970                 }
971
972                 if (name_status_find(domain_name,
973                                      name_type,
974                                      NBT_NAME_SERVER,
975                                      &dclist[i].ss,
976                                      tmp_dc_name))
977                 {
978                         struct NETLOGON_SAM_LOGON_RESPONSE_NT40 logon1;
979
980                         r = talloc_zero(mem_ctx, struct netlogon_samlogon_response);
981                         NT_STATUS_HAVE_NO_MEMORY(r);
982
983                         ZERO_STRUCT(logon1);
984
985                         nt_version = NETLOGON_NT_VERSION_1;
986
987                         logon1.nt_version = nt_version;
988                         logon1.pdc_name = tmp_dc_name;
989                         logon1.domain_name = talloc_strdup_upper(mem_ctx, domain_name);
990                         NT_STATUS_HAVE_NO_MEMORY(logon1.domain_name);
991
992                         r->data.nt4 = logon1;
993                         r->ntver = nt_version;
994
995                         map_netlogon_samlogon_response(r);
996
997                         namecache_store(tmp_dc_name, NBT_NAME_SERVER, 1, &ip_list);
998
999                         goto make_reply;
1000                 }
1001         }
1002
1003         return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1004
1005  make_reply:
1006
1007         status = make_dc_info_from_cldap_reply(mem_ctx, flags, &dclist[i].ss,
1008                                                &r->data.nt5_ex, info);
1009         if (NT_STATUS_IS_OK(status) && store_cache) {
1010                 return store_cldap_reply(mem_ctx, flags, &dclist[i].ss,
1011                                          nt_version, &r->data.nt5_ex);
1012         }
1013
1014         return status;
1015 }
1016
1017 /****************************************************************
1018 ****************************************************************/
1019
1020 static NTSTATUS dsgetdcname_rediscover(TALLOC_CTX *mem_ctx,
1021                                        struct messaging_context *msg_ctx,
1022                                        const char *domain_name,
1023                                        const struct GUID *domain_guid,
1024                                        uint32_t flags,
1025                                        const char *site_name,
1026                                        struct netr_DsRGetDCNameInfo **info)
1027 {
1028         NTSTATUS status = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1029         struct ip_service_name *dclist = NULL;
1030         int num_dcs;
1031
1032         DEBUG(10,("dsgetdcname_rediscover\n"));
1033
1034         if (flags & DS_IS_FLAT_NAME) {
1035
1036                 status = discover_dc_netbios(mem_ctx, domain_name, flags,
1037                                              &dclist, &num_dcs);
1038                 NT_STATUS_NOT_OK_RETURN(status);
1039
1040                 return process_dc_netbios(mem_ctx, msg_ctx, domain_name, flags,
1041                                           dclist, num_dcs, info);
1042         }
1043
1044         if (flags & DS_IS_DNS_NAME) {
1045
1046                 status = discover_dc_dns(mem_ctx, domain_name, domain_guid,
1047                                          flags, site_name, &dclist, &num_dcs);
1048                 NT_STATUS_NOT_OK_RETURN(status);
1049
1050                 return process_dc_dns(mem_ctx, domain_name, flags,
1051                                       dclist, num_dcs, info);
1052         }
1053
1054         status = discover_dc_dns(mem_ctx, domain_name, domain_guid, flags,
1055                                  site_name, &dclist, &num_dcs);
1056
1057         if (NT_STATUS_IS_OK(status) && num_dcs != 0) {
1058
1059                 status = process_dc_dns(mem_ctx, domain_name, flags, dclist,
1060                                         num_dcs, info);
1061                 if (NT_STATUS_IS_OK(status)) {
1062                         return status;
1063                 }
1064         }
1065
1066         status = discover_dc_netbios(mem_ctx, domain_name, flags, &dclist,
1067                                      &num_dcs);
1068         NT_STATUS_NOT_OK_RETURN(status);
1069
1070         return process_dc_netbios(mem_ctx, msg_ctx, domain_name, flags, dclist,
1071                                   num_dcs, info);
1072 }
1073
1074 static bool is_closest_site(struct netr_DsRGetDCNameInfo *info)
1075 {
1076         if (info->dc_flags & DS_SERVER_CLOSEST) {
1077                 return true;
1078         }
1079
1080         if (!info->client_site_name) {
1081                 return true;
1082         }
1083
1084         if (!info->dc_site_name) {
1085                 return false;
1086         }
1087
1088         if (strcmp(info->client_site_name, info->dc_site_name) == 0) {
1089                 return true;
1090         }
1091
1092         return false;
1093 }
1094
1095 /********************************************************************
1096  dsgetdcname.
1097
1098  This will be the only public function here.
1099 ********************************************************************/
1100
1101 NTSTATUS dsgetdcname(TALLOC_CTX *mem_ctx,
1102                      struct messaging_context *msg_ctx,
1103                      const char *domain_name,
1104                      const struct GUID *domain_guid,
1105                      const char *site_name,
1106                      uint32_t flags,
1107                      struct netr_DsRGetDCNameInfo **info)
1108 {
1109         NTSTATUS status = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1110         struct netr_DsRGetDCNameInfo *myinfo = NULL;
1111         char *query_site = NULL;
1112         bool first = true;
1113         struct netr_DsRGetDCNameInfo *first_info = NULL;
1114
1115         DEBUG(10,("dsgetdcname: domain_name: %s, "
1116                   "domain_guid: %s, site_name: %s, flags: 0x%08x\n",
1117                   domain_name,
1118                   domain_guid ? GUID_string(mem_ctx, domain_guid) : "(null)",
1119                   site_name, flags));
1120
1121         *info = NULL;
1122
1123         if (!check_allowed_required_flags(flags, site_name)) {
1124                 DEBUG(0,("invalid flags specified\n"));
1125                 return NT_STATUS_INVALID_PARAMETER;
1126         }
1127
1128         if ((site_name == NULL) || (site_name[0] == '\0')) {
1129                 query_site = sitename_fetch(domain_name);
1130         } else {
1131                 query_site = SMB_STRDUP(site_name);
1132         }
1133
1134         if (flags & DS_FORCE_REDISCOVERY) {
1135                 goto rediscover;
1136         }
1137
1138         status = dsgetdcname_cached(mem_ctx, msg_ctx, domain_name, domain_guid,
1139                                     flags, query_site, &myinfo);
1140         if (NT_STATUS_IS_OK(status)) {
1141                 goto done;
1142         }
1143
1144         if (flags & DS_BACKGROUND_ONLY) {
1145                 goto done;
1146         }
1147
1148  rediscover:
1149         status = dsgetdcname_rediscover(mem_ctx, msg_ctx, domain_name,
1150                                         domain_guid, flags, query_site,
1151                                         &myinfo);
1152
1153  done:
1154         SAFE_FREE(query_site);
1155
1156         if (!NT_STATUS_IS_OK(status)) {
1157                 if (!first) {
1158                         *info = first_info;
1159                         return NT_STATUS_OK;
1160                 }
1161                 return status;
1162         }
1163
1164         if (!first) {
1165                 TALLOC_FREE(first_info);
1166         } else if (!is_closest_site(myinfo)) {
1167                 first = false;
1168                 first_info = myinfo;
1169                 /* TODO: may use the next_closest_site here */
1170                 query_site = SMB_STRDUP(myinfo->client_site_name);
1171                 goto rediscover;
1172         }
1173
1174         *info = myinfo;
1175         return NT_STATUS_OK;
1176 }