summaryrefslogtreecommitdiffstats
path: root/src/providers/ipa/ipa_dyndns.c
blob: 52b8051b0ab1b2b91b3972ab8673517b01cfff0d (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
/*
    SSSD

    ipa_dyndns.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 <ctype.h>
#include "util/util.h"
#include "providers/ldap/sdap_dyndns.h"
#include "providers/ipa/ipa_common.h"
#include "providers/ipa/ipa_dyndns.h"
#include "providers/data_provider.h"
#include "providers/dp_dyndns.h"

void ipa_dyndns_update(void *pvt);

errno_t ipa_dyndns_init(struct be_ctx *be_ctx,
                        struct ipa_options *ctx)
{
    errno_t ret;

    ctx->be_res = be_ctx->be_res;
    if (ctx->be_res == NULL) {
        DEBUG(SSSDBG_OP_FAILURE, ("Resolver must be initialized in order "
              "to use the IPA dynamic DNS updates\n"));
        return EINVAL;
    }

    ret = be_add_online_cb(be_ctx, be_ctx,
                           ipa_dyndns_update,
                           ctx, NULL);
    if (ret != EOK) {
        DEBUG(SSSDBG_CRIT_FAILURE, ("Could not set up online callback\n"));
        return ret;
    }

    return EOK;
}

struct ipa_dyndns_timer_ctx {
    struct sdap_id_op *sdap_op;
    struct tevent_context *ev;

    struct ipa_options *ctx;
};

static void ipa_dyndns_timer_connected(struct tevent_req *req);

void ipa_dyndns_timer(void *pvt)
{
    struct ipa_options *ctx = talloc_get_type(pvt, struct ipa_options);
    struct sdap_id_ctx *sdap_ctx = ctx->id_ctx->sdap_id_ctx;
    struct tevent_req *req;
    struct ipa_dyndns_timer_ctx *timer_ctx;
    errno_t ret;

    timer_ctx = talloc_zero(ctx, struct ipa_dyndns_timer_ctx);
    if (timer_ctx == NULL) {
        DEBUG(SSSDBG_CRIT_FAILURE, ("Out of memory\n"));
        /* Not much we can do */
        return;
    }
    timer_ctx->ev = sdap_ctx->be->ev;
    timer_ctx->ctx = ctx;

    /* In order to prevent the connection triggering an
     * online callback which would in turn trigger a concurrent DNS
     * update
     */
    ctx->dyndns_ctx->timer_in_progress = true;

    /* Make sure to have a valid LDAP connection */
    timer_ctx->sdap_op = sdap_id_op_create(timer_ctx, sdap_ctx->conn_cache);
    if (timer_ctx->sdap_op == NULL) {
        DEBUG(SSSDBG_OP_FAILURE, ("sdap_id_op_create failed\n"));
        goto fail;
    }

    req = sdap_id_op_connect_send(timer_ctx->sdap_op, timer_ctx, &ret);
    if (req == NULL) {
        DEBUG(SSSDBG_OP_FAILURE, ("sdap_id_op_connect_send failed: [%d](%s)\n",
              ret, sss_strerror(ret)));
        goto fail;
    }
    tevent_req_set_callback(req, ipa_dyndns_timer_connected, timer_ctx);
    return;

fail:
    ctx->dyndns_ctx->timer_in_progress = false;
    be_nsupdate_timer_schedule(timer_ctx->ev, ctx->dyndns_ctx);
    talloc_free(timer_ctx);
}

static void ipa_dyndns_timer_connected(struct tevent_req *req)
{
    errno_t ret;
    int dp_error;
    struct ipa_dyndns_timer_ctx *timer_ctx = tevent_req_callback_data(req,
                                     struct ipa_dyndns_timer_ctx);
    struct tevent_context *ev;
    struct ipa_options *ctx;

    ctx = timer_ctx->ctx;
    ev = timer_ctx->ev;
    ctx->dyndns_ctx->timer_in_progress = false;

    ret = sdap_id_op_connect_recv(req, &dp_error);
    talloc_zfree(req);
    talloc_free(timer_ctx);
    if (ret != EOK) {
        if (dp_error == DP_ERR_OFFLINE) {
            DEBUG(SSSDBG_MINOR_FAILURE, ("No IPA server is available, "
                  "dynamic DNS update is skipped in offline mode.\n"));
            /* Another timer will be scheduled when provider goes online
             * and ipa_dyndns_update() is called */
        } else {
            DEBUG(SSSDBG_OP_FAILURE,
                  ("Failed to connect to LDAP server: [%d](%s)\n",
                  ret, sss_strerror(ret)));

            /* Just schedule another dyndns retry */
            be_nsupdate_timer_schedule(ev, ctx->dyndns_ctx);
        }
        return;
    }

    /* all OK just call ipa_dyndns_update and schedule another refresh */
    be_nsupdate_timer_schedule(ev, ctx->dyndns_ctx);
    return ipa_dyndns_update(ctx);
}

static struct tevent_req *ipa_dyndns_update_send(struct ipa_options *ctx);
static errno_t ipa_dyndns_update_recv(struct tevent_req *req);

static void ipa_dyndns_nsupdate_done(struct tevent_req *subreq);

void ipa_dyndns_update(void *pvt)
{
    struct ipa_options *ctx = talloc_get_type(pvt, struct ipa_options);
    struct sdap_id_ctx *sdap_ctx = ctx->id_ctx->sdap_id_ctx;

    /* Schedule timer after provider went offline */
    be_nsupdate_timer_schedule(sdap_ctx->be->ev, ctx->dyndns_ctx);

    struct tevent_req *req = ipa_dyndns_update_send(ctx);
    if (req == NULL) {
        DEBUG(SSSDBG_CRIT_FAILURE, ("Could not update DNS\n"));
        return;
    }
    tevent_req_set_callback(req, ipa_dyndns_nsupdate_done, NULL);
}

static void ipa_dyndns_nsupdate_done(struct tevent_req *req)
{
    int ret = ipa_dyndns_update_recv(req);
    talloc_free(req);
    if (ret != EOK) {
        DEBUG(SSSDBG_OP_FAILURE, ("Updating DNS entry failed [%d]: %s\n",
              ret, sss_strerror(ret)));
        return;
    }

    DEBUG(SSSDBG_OP_FAILURE, ("DNS update finished\n"));
}

struct ipa_dyndns_update_state {
    struct ipa_options *ipa_ctx;
};

static void ipa_dyndns_sdap_update_done(struct tevent_req *subreq);

static struct tevent_req *
ipa_dyndns_update_send(struct ipa_options *ctx)
{
    int ret;
    struct ipa_dyndns_update_state *state;
    struct tevent_req *req, *subreq;
    struct sdap_id_ctx *sdap_ctx = ctx->id_ctx->sdap_id_ctx;
    char *dns_zone;
    const char *servername;
    int i;

    DEBUG(SSSDBG_TRACE_FUNC, ("Performing update\n"));

    req = tevent_req_create(ctx, &state, struct ipa_dyndns_update_state);
    if (req == NULL) {
        return NULL;
    }
    state->ipa_ctx = ctx;

    if (ctx->dyndns_ctx->last_refresh + 60 > time(NULL) ||
        ctx->dyndns_ctx->timer_in_progress) {
        DEBUG(SSSDBG_FUNC_DATA, ("Last periodic update ran recently or timer"
              "in progress, not scheduling another update\n"));
        tevent_req_done(req);
        tevent_req_post(req, sdap_ctx->be->ev);
        return req;
    }
    state->ipa_ctx->dyndns_ctx->last_refresh = time(NULL);

    dns_zone = dp_opt_get_string(ctx->basic, IPA_DOMAIN);
    if (!dns_zone) {
        ret = EIO;
        goto done;
    }

    /* The DNS zone for IPA is the lower-case
     * version of the IPA domain
     */
    for (i = 0; dns_zone[i] != '\0'; i++) {
        dns_zone[i] = tolower(dns_zone[i]);
    }

    if (strncmp(ctx->service->sdap->uri,
                "ldap://", 7) != 0) {
        DEBUG(SSSDBG_CRIT_FAILURE, ("Unexpected format of LDAP URI.\n"));
        ret = EIO;
        goto done;
    }
    servername = ctx->service->sdap->uri + 7;
    if (!servername) {
        ret = EIO;
        goto done;
    }

    subreq = sdap_dyndns_update_send(state, sdap_ctx->be->ev,
                                     sdap_ctx->be, sdap_ctx,
                                     dp_opt_get_string(ctx->dyndns_ctx->opts,
                                                       DP_OPT_DYNDNS_IFACE),
                                     dp_opt_get_string(ctx->basic,
                                                       IPA_HOSTNAME),
                                     dns_zone,
                                     dp_opt_get_string(ctx->basic,
                                                       IPA_KRB5_REALM),
                                     servername,
                                     dp_opt_get_int(ctx->dyndns_ctx->opts,
                                                    DP_OPT_DYNDNS_TTL),
                                     true);
    if (!subreq) {
        ret = EIO;
        DEBUG(SSSDBG_OP_FAILURE,
              ("sdap_id_op_connect_send failed: [%d](%s)\n",
               ret, sss_strerror(ret)));
        goto done;
    }
    tevent_req_set_callback(subreq, ipa_dyndns_sdap_update_done, req);

    ret = EOK;
done:
    if (ret != EOK) {
        tevent_req_error(req, ret);
        tevent_req_post(req, sdap_ctx->be->ev);
    }
    return req;
}

static void ipa_dyndns_sdap_update_done(struct tevent_req *subreq)
{
    struct tevent_req *req = tevent_req_callback_data(subreq, struct tevent_req);
    errno_t ret;

    ret = sdap_dyndns_update_recv(subreq);
    talloc_zfree(subreq);
    if (ret != EOK) {
        DEBUG(SSSDBG_OP_FAILURE,
              ("Dynamic DNS update failed [%d]: %s\n", ret, sss_strerror(ret)));
        tevent_req_error(req, ret);
        return;
    }

    tevent_req_done(req);
}

static errno_t ipa_dyndns_update_recv(struct tevent_req *req)
{
    TEVENT_REQ_RETURN_ON_ERROR(req);

    return EOK;
}