solanum-vs-hackint-and-char.../authd/providers/rdns.c
Elizabeth Myers 15c49abbb3 authd/providers: add timeout callback system.
This means that each provider no longer has to keep its own event; it
can set a timeout and have a callbackinstead.
2016-03-30 17:21:49 -05:00

174 lines
4.3 KiB
C

/* authd/providers/rdns.c - rDNS lookup provider for authd
* Copyright (c) 2016 Elizabeth Myers <elizabeth@interlinked.me>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice is present in all copies.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "stdinc.h"
#include "rb_commio.h"
#include "authd.h"
#include "provider.h"
#include "notice.h"
#include "res.h"
#include "dns.h"
struct user_query
{
struct dns_query *query; /* Pending DNS query */
};
/* Goinked from old s_auth.c --Elizabeth */
static const char *messages[] =
{
"*** Looking up your hostname...",
"*** Found your hostname",
"*** Couldn't look up your hostname",
"*** Your hostname is too long, ignoring hostname",
};
typedef enum
{
REPORT_LOOKUP,
REPORT_FOUND,
REPORT_FAIL,
REPORT_TOOLONG,
} dns_message;
static void client_fail(struct auth_client *auth, dns_message message);
static void client_success(struct auth_client *auth);
static void dns_answer_callback(const char *res, bool status, query_type type, void *data);
static int rdns_timeout = 15;
static void
dns_answer_callback(const char *res, bool status, query_type type, void *data)
{
struct auth_client *auth = data;
struct user_query *query = auth->data[PROVIDER_RDNS];
if(query == NULL || res == NULL || status == false)
client_fail(auth, REPORT_FAIL);
else if(strlen(res) > HOSTLEN)
client_fail(auth, REPORT_TOOLONG);
else
{
rb_strlcpy(auth->hostname, res, HOSTLEN + 1);
client_success(auth);
}
}
static void
client_fail(struct auth_client *auth, dns_message report)
{
struct user_query *query = auth->data[PROVIDER_RDNS];
if(query == NULL)
return;
rb_strlcpy(auth->hostname, "*", sizeof(auth->hostname));
notice_client(auth->cid, messages[report]);
cancel_query(query->query);
rb_free(query);
auth->data[PROVIDER_RDNS] = NULL;
auth->timeout[PROVIDER_RDNS] = 0;
provider_done(auth, PROVIDER_RDNS);
}
static void
client_success(struct auth_client *auth)
{
struct user_query *query = auth->data[PROVIDER_RDNS];
notice_client(auth->cid, messages[REPORT_FOUND]);
cancel_query(query->query);
rb_free(query);
auth->data[PROVIDER_RDNS] = NULL;
auth->timeout[PROVIDER_RDNS] = 0;
provider_done(auth, PROVIDER_RDNS);
}
static void
rdns_destroy(void)
{
struct auth_client *auth;
rb_dictionary_iter iter;
RB_DICTIONARY_FOREACH(auth, &iter, auth_clients)
{
if(auth->data[PROVIDER_RDNS] != NULL)
client_fail(auth, REPORT_FAIL);
}
}
static bool
rdns_start(struct auth_client *auth)
{
struct user_query *query = rb_malloc(sizeof(struct user_query));
auth->data[PROVIDER_RDNS] = query;
auth->timeout[PROVIDER_RDNS] = rb_current_time() + rdns_timeout;
query->query = lookup_hostname(auth->c_ip, dns_answer_callback, auth);
notice_client(auth->cid, messages[REPORT_LOOKUP]);
set_provider_on(auth, PROVIDER_RDNS);
return true;
}
static void
rdns_cancel(struct auth_client *auth)
{
struct user_query *query = auth->data[PROVIDER_RDNS];
if(query != NULL)
client_fail(auth, REPORT_FAIL);
}
static void
add_conf_dns_timeout(const char *key, int parc, const char **parv)
{
int timeout = atoi(parv[0]);
if(timeout < 0)
{
warn_opers(L_CRIT, "rDNS: DNS timeout < 0 (value: %d)", timeout);
exit(EX_PROVIDER_ERROR);
}
rdns_timeout = timeout;
}
struct auth_opts_handler rdns_options[] =
{
{ "rdns_timeout", 1, add_conf_dns_timeout },
{ NULL, 0, NULL },
};
struct auth_provider rdns_provider =
{
.id = PROVIDER_RDNS,
.destroy = rdns_destroy,
.start = rdns_start,
.cancel = rdns_cancel,
.timeout = rdns_cancel,
.opt_handlers = rdns_options,
};