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/*
Authors:
Pavel Březina <pbrezina@redhat.com>
Copyright (C) 2013 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 <string.h>
#include <talloc.h>
#include <tevent.h>
#include "util/util.h"
#include "resolv/async_resolv.h"
#include "providers/fail_over_srv.h"
#define IPA_DNS_LOCATION "_location"
struct ipa_srv_plugin_ctx {
struct resolv_ctx *resolv_ctx;
const char *hostname;
const char *ipa_domain;
};
struct ipa_srv_plugin_ctx *
ipa_srv_plugin_ctx_init(TALLOC_CTX *mem_ctx,
struct resolv_ctx *resolv_ctx,
const char *hostname,
const char *ipa_domain)
{
struct ipa_srv_plugin_ctx *ctx = NULL;
ctx = talloc_zero(mem_ctx, struct ipa_srv_plugin_ctx);
if (ctx == NULL) {
return NULL;
}
ctx->resolv_ctx = resolv_ctx;
ctx->hostname = talloc_strdup(ctx, hostname);
if (ctx->hostname == NULL) {
goto fail;
}
ctx->ipa_domain = talloc_strdup(ctx, ipa_domain);
if (ctx->ipa_domain == NULL) {
goto fail;
}
return ctx;
fail:
talloc_free(ctx);
return NULL;
}
struct ipa_srv_plugin_state {
char *dns_domain;
struct fo_server_info *primary_servers;
size_t num_primary_servers;
struct fo_server_info *backup_servers;
size_t num_backup_servers;
};
static void ipa_srv_plugin_done(struct tevent_req *subreq);
/* If IPA server supports sites, we will use
* _locations.hostname.discovery_domain for primary servers and
* discovery_domain for backup servers. If the server does not support sites or
* client's SRV record is not found, we will use the latter for primary
* servers, setting backup servers to NULL */
struct tevent_req *ipa_srv_plugin_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
const char *service,
const char *protocol,
const char *discovery_domain,
void *pvt)
{
struct ipa_srv_plugin_state *state = NULL;
struct ipa_srv_plugin_ctx *ctx = NULL;
struct tevent_req *req = NULL;
struct tevent_req *subreq = NULL;
const char *primary_domain = NULL;
const char *backup_domain = NULL;
errno_t ret;
req = tevent_req_create(mem_ctx, &state,
struct ipa_srv_plugin_state);
if (req == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE, ("tevent_req_create() failed\n"));
return NULL;
}
ctx = talloc_get_type(pvt, struct ipa_srv_plugin_ctx);
if (ctx == NULL) {
ret = EINVAL;
goto immediately;
}
if (discovery_domain != NULL) {
backup_domain = talloc_strdup(state, discovery_domain);
} else {
backup_domain = talloc_strdup(state, ctx->ipa_domain);
}
if (backup_domain == NULL) {
ret = ENOMEM;
goto immediately;
}
if (strchr(ctx->hostname, '.') == NULL) {
/* not FQDN, append domain name */
primary_domain = talloc_asprintf(state, IPA_DNS_LOCATION ".%s.%s",
ctx->hostname, backup_domain);
} else {
primary_domain = talloc_asprintf(state, IPA_DNS_LOCATION ".%s",
ctx->hostname);
}
if (primary_domain == NULL) {
ret = ENOMEM;
goto immediately;
}
DEBUG(SSSDBG_TRACE_FUNC, ("About to discover primary and "
"backup servers\n"));
subreq = fo_discover_servers_send(state, ev, ctx->resolv_ctx, service,
protocol, primary_domain, backup_domain);
if (subreq == NULL) {
ret = ENOMEM;
goto immediately;
}
tevent_req_set_callback(subreq, ipa_srv_plugin_done, req);
return req;
immediately:
tevent_req_error(req, ret);
tevent_req_post(req, ev);
return req;
}
static void ipa_srv_plugin_done(struct tevent_req *subreq)
{
struct ipa_srv_plugin_state *state = NULL;
struct tevent_req *req = NULL;
errno_t ret;
req = tevent_req_callback_data(subreq, struct tevent_req);
state = tevent_req_data(req, struct ipa_srv_plugin_state);
ret = fo_discover_servers_recv(state, subreq, &state->dns_domain,
&state->primary_servers,
&state->num_primary_servers,
&state->backup_servers,
&state->num_backup_servers);
talloc_zfree(subreq);
if (ret != EOK) {
tevent_req_error(req, ret);
return;
}
DEBUG(SSSDBG_TRACE_FUNC, ("Got %lu primary and %lu backup servers\n",
state->num_primary_servers, state->num_backup_servers));
tevent_req_done(req);
}
errno_t ipa_srv_plugin_recv(TALLOC_CTX *mem_ctx,
struct tevent_req *req,
char **_dns_domain,
struct fo_server_info **_primary_servers,
size_t *_num_primary_servers,
struct fo_server_info **_backup_servers,
size_t *_num_backup_servers)
{
struct ipa_srv_plugin_state *state = NULL;
state = tevent_req_data(req, struct ipa_srv_plugin_state);
TEVENT_REQ_RETURN_ON_ERROR(req);
if (_primary_servers) {
*_primary_servers = talloc_steal(mem_ctx, state->primary_servers);
}
if (_num_primary_servers) {
*_num_primary_servers = state->num_primary_servers;
}
if (_backup_servers) {
*_backup_servers = talloc_steal(mem_ctx, state->backup_servers);
}
if (_num_backup_servers) {
*_num_backup_servers = state->num_backup_servers;
}
if (_dns_domain) {
*_dns_domain = talloc_steal(mem_ctx, state->dns_domain);
}
return EOK;
}
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