summaryrefslogtreecommitdiffstats
path: root/daemons/ipa-slapi-plugins/ipa-version/ipa_repl_version.c
blob: 28cd3e07ade34782797ece7f66455ede45877da6 (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
/** BEGIN COPYRIGHT BLOCK
 * 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/>.
 *
 * Additional permission under GPLv3 section 7:
 *
 * In the following paragraph, "GPL" means the GNU General Public
 * License, version 3 or any later version, and "Non-GPL Code" means
 * code that is governed neither by the GPL nor a license
 * compatible with the GPL.
 *
 * You may link the code of this Program with Non-GPL Code and convey
 * linked combinations including the two, provided that such Non-GPL
 * Code only links to the code of this Program through those well
 * defined interfaces identified in the file named EXCEPTION found in
 * the source code files (the "Approved Interfaces"). The files of
 * Non-GPL Code may instantiate templates or use macros or inline
 * functions from the Approved Interfaces without causing the resulting
 * work to be covered by the GPL. Only the copyright holders of this
 * Program may make changes or additions to the list of Approved
 * Interfaces.
 *
 * Copyright (C) 2005 Red Hat, Inc.
 * All rights reserved.
 * END COPYRIGHT BLOCK **/

#include "slapi-plugin.h"
#include "repl-session-plugin.h"
#include "ipa-version.h"
#include "util.h"
#include <string.h>

/* Identify the type of data we're sending, an unsigned int in this case */
#define REPL_VERSION_DATA_GUID "2D562D8B-2F30-4447-AF76-2B721D1D5F6A"

#define IPA_PLUGIN_NAME "ipa_replication_version"
static char *data_version = NULL;

/*
 * Plugin identifiers
 */
static Slapi_PluginDesc repl_version_pdesc = {
    "ipa-repl-version-plugin",
    "Red Hat, Inc.",
    "1.0",
    "IPA Replication version plugin"
};

static Slapi_ComponentId *repl_version_plugin_id = NULL;


/*
 * Replication Version Callbacks
 */

/*
 * This is called on a master when we are about to acquire a
 * replica.
 *
 * Returning non-0 will abort the replication session.  This
 * results in the master going into incremental backoff mode.
 */
static int
repl_version_plugin_pre_acquire_cb(void *cookie, const Slapi_DN *repl_subtree,
                                        int is_total, char **data_guid, struct berval **data)
{
    LOG("repl_version_plugin_pre_acquire_cb() called for suffix \"%s\", "
        "is_total: \"%s\".\n", slapi_sdn_get_ndn(repl_subtree),
        is_total ? "TRUE" : "FALSE");

    /* allocate some data to be sent to the replica */
    *data_guid = slapi_ch_smprintf("%s", REPL_VERSION_DATA_GUID);
    *data = (struct berval *)slapi_ch_malloc(sizeof(struct berval));
    (*data)->bv_val = slapi_ch_smprintf("%s", data_version);
    (*data)->bv_len = strlen((*data)->bv_val) + 1;

    LOG("repl_version_plugin_pre_acquire_cb() sending data: guid: \"%s\" data: \"%s\".\n",
        *data_guid, (*data)->bv_val);

    return 0;
}

/*
 * This is called on a replica when it receives a start replication
 * extended operation from a master.
 *
 * The data sent by the master (version) is compared with our own
 * hardcoded version to determine if replication can proceed or not.
 *
 * The replication plug-in will take care of freeing data_guid and data.
 *
 * Returning non-0 will abort the replication session.  This
 * results in the master going into incremental backoff mode.
 */
static int
repl_version_plugin_recv_acquire_cb(const char *repl_subtree, int is_total,
                                         const char *data_guid, const struct berval *data)
{
    LOG("test_repl_session_plugin_recv_acquire_cb() called for suffix \"%s\", is_total: \"%s\".\n",
        repl_subtree, is_total ? "TRUE" : "FALSE");

    /* compare our data version to the master data version */
    if (data_guid && data && (strcmp(data_guid, REPL_VERSION_DATA_GUID) == 0)) {
        LOG("repl_version_plugin_recv_acquire_cb() received data: guid: \"%s\" data: \"%s\".\n",
            data_guid, data->bv_val);
        if (!(strcmp(data_version, data->bv_val) == 0)) {
            LOG_FATAL("Incompatible IPA versions, pausing replication. "
                      "This server: \"%s\" remote server: \"%s\".\n",
                      data_version, data->bv_val);
            return 1;
        }
    }

    return 0;
}

/*
 * Callback list for registering API
 */
static void *repl_version_api[] = {
    NULL, /* reserved for api broker use, must be zero */
    NULL, /* init cb */
    repl_version_plugin_pre_acquire_cb,
    NULL, /* reply_acquire_cb */
    NULL, /* post_acquire_cb */
    repl_version_plugin_recv_acquire_cb,
    NULL /* destroy cb */
};

/*
 * Plug-in framework functions
 */
static int
repl_version_plugin_start(Slapi_PBlock *pb)
{
    LOG("--> repl_version_plugin_start -- begin\n");

    data_version = slapi_ch_smprintf("%llu", (unsigned long long) DATA_VERSION);

    LOG("<-- repl_version_plugin_start -- end\n");
    return 0;
}

static int
repl_version_plugin_close(Slapi_PBlock *pb)
{
    LOG("--> repl_version_plugin_close -- begin\n");

    slapi_apib_unregister(REPL_SESSION_v1_0_GUID);

    slapi_ch_free_string(&data_version);

    LOG("<-- repl_version_plugin_close -- end\n");
    return 0;
}

int repl_version_plugin_init(Slapi_PBlock *pb)
{
    LOG("--> repl_version_plugin_init -- begin\n");

    if ( slapi_pblock_set( pb, SLAPI_PLUGIN_VERSION,
                           SLAPI_PLUGIN_VERSION_01 ) != 0 ||
         slapi_pblock_set(pb, SLAPI_PLUGIN_START_FN,
                          (void *) repl_version_plugin_start ) != 0 ||
         slapi_pblock_set(pb, SLAPI_PLUGIN_CLOSE_FN,
                          (void *) repl_version_plugin_close ) != 0 ||
         slapi_pblock_set( pb, SLAPI_PLUGIN_DESCRIPTION,
                           (void *)&repl_version_pdesc ) != 0 )
    {
        LOG_FATAL("<-- repl_version_plugin_init -- failed to register plugin -- end\n");
        return -1;
    }

    if( slapi_apib_register(REPL_SESSION_v1_0_GUID, repl_version_api) ) {
        LOG_FATAL("<-- repl_version_plugin_start -- failed to register repl_version api -- end\n");
        return -1;
    }


    /* Retrieve and save the plugin identity to later pass to
       internal operations */
    if (slapi_pblock_get(pb, SLAPI_PLUGIN_IDENTITY, &repl_version_plugin_id) != 0) {
        LOG_FATAL("<-- repl_version_plugin_init -- failed to retrieve plugin identity -- end\n");
        return -1;
    }

    LOG("<-- repl_version_plugin_init -- end\n");
    return 0;
}