summaryrefslogtreecommitdiff
path: root/source4/dsdb/kcc/kcc_periodic.c
blob: 30d43033cbc80402dca36b812d640906662f92b2 (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
/* 
   Unix SMB/CIFS mplementation.
   KCC service periodic handling
   
   Copyright (C) Andrew Tridgell 2009
   based on repl service code
    
   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 "includes.h"
#include "lib/events/events.h"
#include "dsdb/samdb/samdb.h"
#include "auth/auth.h"
#include "smbd/service.h"
#include "lib/messaging/irpc.h"
#include "dsdb/kcc/kcc_service.h"
#include "lib/ldb/include/ldb_errors.h"
#include "../lib/util/dlinklist.h"
#include "librpc/gen_ndr/ndr_misc.h"
#include "librpc/gen_ndr/ndr_drsuapi.h"
#include "librpc/gen_ndr/ndr_drsblobs.h"
#include "param/param.h"

/*
 * see if a repsFromToBlob is in a list
 */
static bool reps_in_list(struct repsFromToBlob *r, struct repsFromToBlob *reps, uint32_t count)
{
	int i;
	for (i=0; i<count; i++) {
		if (strcmp(r->ctr.ctr1.other_info->dns_name, 
			   reps[i].ctr.ctr1.other_info->dns_name) == 0 &&
		    GUID_compare(&r->ctr.ctr1.source_dsa_obj_guid, 
				 &reps[i].ctr.ctr1.source_dsa_obj_guid) == 0) {
			return true;
		}
	}
	return false;
}


/*
 * add any missing repsFrom structures to our partitions
 */
static NTSTATUS kccsrv_add_repsFrom(struct kccsrv_service *s, TALLOC_CTX *mem_ctx,
				    struct repsFromToBlob *reps, uint32_t count)
{
	struct kccsrv_partition *p;

	/* update the repsFrom on all partitions */
	for (p=s->partitions; p; p=p->next) {
		struct repsFromToBlob *old_reps;
		uint32_t old_count;
		WERROR werr;
		int i;
		bool modified = false;

		werr = dsdb_loadreps(s->samdb, mem_ctx, p->dn, "repsFrom", &old_reps, &old_count);
		if (!W_ERROR_IS_OK(werr)) {
			DEBUG(0,(__location__ ": Failed to load repsFrom from %s - %s\n", 
				 ldb_dn_get_linearized(p->dn), ldb_errstring(s->samdb)));
			return NT_STATUS_INTERNAL_DB_CORRUPTION;
		}

		/* add any new ones */
		for (i=0; i<count; i++) {
			if (!reps_in_list(&reps[i], old_reps, old_count)) {
				old_reps = talloc_realloc(mem_ctx, old_reps, struct repsFromToBlob, old_count+1);
				NT_STATUS_HAVE_NO_MEMORY(old_reps);
				old_reps[old_count] = reps[i];
				old_count++;
				modified = true;
			}
		}

		/* remove any stale ones */
		for (i=0; i<old_count; i++) {
			if (!reps_in_list(&old_reps[i], reps, count)) {
				memmove(&old_reps[i], &old_reps[i+1], (old_count-(i+1))*sizeof(old_reps[0]));
				old_count--;
				i--;
				modified = true;
			}
		}
		
		if (modified) {
			werr = dsdb_savereps(s->samdb, mem_ctx, p->dn, "repsFrom", old_reps, old_count);
			if (!W_ERROR_IS_OK(werr)) {
				DEBUG(0,(__location__ ": Failed to save repsFrom to %s - %s\n", 
					 ldb_dn_get_linearized(p->dn), ldb_errstring(s->samdb)));
				return NT_STATUS_INTERNAL_DB_CORRUPTION;
			}
		}
	}

	return NT_STATUS_OK;

}

/*
  this is the core of our initial simple KCC
  We just add a repsFrom entry for all DCs we find that have nTDSDSA
  objects, except for ourselves
 */
static NTSTATUS kccsrv_simple_update(struct kccsrv_service *s, TALLOC_CTX *mem_ctx)
{
	struct ldb_result *res;
	int ret, i;
	const char *attrs[] = { "objectGUID", "invocationID", NULL };
	struct repsFromToBlob *reps = NULL;
	uint32_t count = 0;

	ret = ldb_search(s->samdb, mem_ctx, &res, s->config_dn, LDB_SCOPE_SUBTREE, 
			 attrs, "objectClass=nTDSDSA");
	if (ret != LDB_SUCCESS) {
		DEBUG(0,(__location__ ": Failed nTDSDSA search - %s\n", ldb_errstring(s->samdb)));
		return NT_STATUS_INTERNAL_DB_CORRUPTION;
	}

	for (i=0; i<res->count; i++) {
		struct repsFromTo1 *r1;
		struct GUID ntds_guid, invocation_id;

		ntds_guid = samdb_result_guid(res->msgs[i], "objectGUID");
		if (GUID_compare(&ntds_guid, &s->ntds_guid) == 0) {
			/* don't replicate with ourselves */
			continue;
		}

		invocation_id = samdb_result_guid(res->msgs[i], "invocationID");

		reps = talloc_realloc(mem_ctx, reps, struct repsFromToBlob, count+1);
		NT_STATUS_HAVE_NO_MEMORY(reps);

		ZERO_STRUCT(reps[count]);
		reps[count].version = 1;
		r1 = &reps[count].ctr.ctr1;

		r1->other_info               = talloc_zero(reps, struct repsFromTo1OtherInfo);
		r1->other_info->dns_name     = talloc_asprintf(r1->other_info, "%s._msdcs.%s",
							       GUID_string(mem_ctx, &ntds_guid),
							       lp_dnsdomain(s->task->lp_ctx));
		r1->source_dsa_obj_guid      = ntds_guid;
		r1->source_dsa_invocation_id = invocation_id;
		r1->replica_flags            = 
			DRSUAPI_DS_REPLICA_NEIGHBOUR_WRITEABLE | 
			DRSUAPI_DS_REPLICA_NEIGHBOUR_SYNC_ON_STARTUP | 
			DRSUAPI_DS_REPLICA_NEIGHBOUR_DO_SCHEDULED_SYNCS;
		memset(r1->schedule, 0x11, sizeof(r1->schedule));
		count++;
	}

	return kccsrv_add_repsFrom(s, mem_ctx, reps, count);
}


static void kccsrv_periodic_run(struct kccsrv_service *service);

static void kccsrv_periodic_handler_te(struct tevent_context *ev, struct tevent_timer *te,
					 struct timeval t, void *ptr)
{
	struct kccsrv_service *service = talloc_get_type(ptr, struct kccsrv_service);
	WERROR status;

	service->periodic.te = NULL;

	kccsrv_periodic_run(service);

	status = kccsrv_periodic_schedule(service, service->periodic.interval);
	if (!W_ERROR_IS_OK(status)) {
		task_server_terminate(service->task, win_errstr(status), true);
		return;
	}
}

WERROR kccsrv_periodic_schedule(struct kccsrv_service *service, uint32_t next_interval)
{
	TALLOC_CTX *tmp_mem;
	struct tevent_timer *new_te;
	struct timeval next_time;

	/* prevent looping */
	if (next_interval == 0) next_interval = 1;

	next_time = timeval_current_ofs(next_interval, 50);

	if (service->periodic.te) {
		/*
		 * if the timestamp of the new event is higher,
		 * as current next we don't need to reschedule
		 */
		if (timeval_compare(&next_time, &service->periodic.next_event) > 0) {
			return WERR_OK;
		}
	}

	/* reset the next scheduled timestamp */
	service->periodic.next_event = next_time;

	new_te = event_add_timed(service->task->event_ctx, service,
			         service->periodic.next_event,
			         kccsrv_periodic_handler_te, service);
	W_ERROR_HAVE_NO_MEMORY(new_te);

	tmp_mem = talloc_new(service);
	DEBUG(2,("kccsrv_periodic_schedule(%u) %sscheduled for: %s\n",
		next_interval,
		(service->periodic.te?"re":""),
		nt_time_string(tmp_mem, timeval_to_nttime(&next_time))));
	talloc_free(tmp_mem);

	talloc_free(service->periodic.te);
	service->periodic.te = new_te;

	return WERR_OK;
}

static void kccsrv_periodic_run(struct kccsrv_service *service)
{
	TALLOC_CTX *mem_ctx;
	NTSTATUS status;

	DEBUG(2,("kccsrv_periodic_run(): simple update\n"));

	mem_ctx = talloc_new(service);
	status = kccsrv_simple_update(service, mem_ctx);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0,("kccsrv_simple_update failed - %s\n", nt_errstr(status)));
	}
	talloc_free(mem_ctx);
}