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/*
Authors:
Pavel B??ezina <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 <unistd.h>
#include "util/util.h"
#include "resolv/async_resolv.h"
struct resolv_get_domain_state {
char *fqdn;
char *hostname;
};
static void resolv_get_domain_done(struct tevent_req *subreq);
struct tevent_req *
resolv_get_domain_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct resolv_ctx *resolv_ctx,
const char *hostname,
enum host_database *host_dbs,
enum restrict_family family_order)
{
struct resolv_get_domain_state *state = NULL;
struct tevent_req *req = NULL;
struct tevent_req *subreq = NULL;
char system_hostname[HOST_NAME_MAX];
errno_t ret;
req = tevent_req_create(mem_ctx, &state,
struct resolv_get_domain_state);
if (req == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE, ("tevent_req_create() failed\n"));
return NULL;
}
if (hostname == NULL) {
/* use system hostname */
ret = gethostname(system_hostname, HOST_NAME_MAX);
if (ret) {
ret = errno;
DEBUG(SSSDBG_CRIT_FAILURE, ("gethostname() failed: [%d]: %s\n",
ret, strerror(ret)));
goto immediately;
}
system_hostname[HOST_NAME_MAX-1] = '\0';
hostname = system_hostname;
}
state->fqdn = NULL;
state->hostname = talloc_strdup(state, hostname);
if (state->hostname == NULL) {
ret = ENOMEM;
goto immediately;
}
DEBUG(SSSDBG_TRACE_LIBS, ("Host name is: %s\n", state->hostname));
subreq = resolv_gethostbyname_send(state, ev, resolv_ctx, state->hostname,
family_order, host_dbs);
if (subreq == NULL) {
talloc_zfree(req);
return NULL;
}
tevent_req_set_callback(subreq, resolv_get_domain_done, req);
return req;
immediately:
tevent_req_error(req, ret);
tevent_req_post(req, ev);
return req;
}
static void resolv_get_domain_done(struct tevent_req *subreq)
{
struct resolv_get_domain_state *state = NULL;
struct tevent_req *req = NULL;
struct resolv_hostent *rhostent;
int resolv_status;
errno_t ret;
req = tevent_req_callback_data(subreq, struct tevent_req);
state = tevent_req_data(req, struct resolv_get_domain_state);
ret = resolv_gethostbyname_recv(subreq, req, &resolv_status,
NULL, &rhostent);
talloc_zfree(subreq);
if (ret != EOK) {
DEBUG(SSSDBG_OP_FAILURE,
("Could not get fully qualified name for host name %s "
"error [%d]: %s, resolver returned: [%d]: %s\n",
state->hostname, ret, strerror(ret), resolv_status,
resolv_strerror(resolv_status)));
state->fqdn = state->hostname;
} else {
DEBUG(SSSDBG_TRACE_LIBS, ("The FQDN is: %s\n", rhostent->name));
state->fqdn = talloc_steal(state, rhostent->name);
talloc_zfree(rhostent);
}
tevent_req_done(req);
}
errno_t resolv_get_domain_recv(TALLOC_CTX *mem_ctx,
struct tevent_req *req,
char **_dns_domain)
{
struct resolv_get_domain_state *state = NULL;
char *dns_domain = NULL;
char *domptr = NULL;
state = tevent_req_data(req, struct resolv_get_domain_state);
TEVENT_REQ_RETURN_ON_ERROR(req);
domptr = strchr(state->fqdn, '.');
if (domptr == NULL || (*(domptr+1) == '\0')) {
/* If the FQDN did not contain a dot or the dot was the last character
* (broken DNS server perhaps) */
dns_domain = state->fqdn;
} else {
dns_domain = domptr + 1;
}
*_dns_domain = talloc_strdup(mem_ctx, dns_domain);
if (*_dns_domain == NULL) {
return ENOMEM;
}
return EOK;
}
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