mirror of
https://github.com/matrix-construct/construct
synced 2024-10-31 10:58:54 +01:00
227 lines
5.2 KiB
C
227 lines
5.2 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 "res.h"
|
||
|
#include "dns.h"
|
||
|
|
||
|
struct dns_query
|
||
|
{
|
||
|
rb_dlink_node node;
|
||
|
|
||
|
struct auth_client *auth; /* Our client */
|
||
|
struct DNSQuery query; /* DNS query */
|
||
|
time_t timeout; /* When the request times out */
|
||
|
};
|
||
|
|
||
|
/* 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 EVH timeout_dns_queries_event;
|
||
|
static void client_fail(struct dns_query *query, dns_message message);
|
||
|
static void client_success(struct dns_query *query);
|
||
|
static void get_dns_answer(void *userdata, struct DNSReply *reply);
|
||
|
|
||
|
rb_dlink_list queries;
|
||
|
static struct ev_entry *timeout_ev;
|
||
|
int timeout = 30;
|
||
|
|
||
|
|
||
|
bool client_dns_init(void)
|
||
|
{
|
||
|
timeout_ev = rb_event_addish("timeout_dns_queries_event", timeout_dns_queries_event, NULL, 1);
|
||
|
return (timeout_ev != NULL);
|
||
|
}
|
||
|
|
||
|
void client_dns_destroy(void)
|
||
|
{
|
||
|
rb_dlink_node *ptr, *nptr;
|
||
|
struct dns_query *query;
|
||
|
|
||
|
RB_DLINK_FOREACH_SAFE(ptr, nptr, queries.head)
|
||
|
{
|
||
|
client_fail(ptr->data, REPORT_FAIL);
|
||
|
rb_dlinkDelete(ptr, &queries);
|
||
|
rb_free(ptr);
|
||
|
}
|
||
|
|
||
|
rb_event_delete(timeout_ev);
|
||
|
}
|
||
|
|
||
|
bool client_dns_start(struct auth_client *auth)
|
||
|
{
|
||
|
struct dns_query *query = rb_malloc(sizeof(struct dns_query));
|
||
|
|
||
|
query->auth = auth;
|
||
|
query->timeout = rb_current_time() + timeout;
|
||
|
|
||
|
query->query.ptr = query;
|
||
|
query->query.callback = get_dns_answer;
|
||
|
|
||
|
gethost_byaddr(&auth->c_addr, &query->query);
|
||
|
notice_client(auth, messages[REPORT_LOOKUP]);
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
void client_dns_cancel(struct auth_client *auth)
|
||
|
{
|
||
|
rb_dlink_node *ptr;
|
||
|
|
||
|
/* Bah, the stupid DNS resolver code doesn't have a cancellation
|
||
|
* func... */
|
||
|
RB_DLINK_FOREACH(ptr, queries.head)
|
||
|
{
|
||
|
struct dns_query *query = ptr->data;
|
||
|
|
||
|
if(query->auth == auth)
|
||
|
{
|
||
|
/* This will get cleaned up later by the DNS stuff */
|
||
|
client_fail(query, REPORT_FAIL);
|
||
|
return;
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static void
|
||
|
get_dns_answer(void *userdata, struct DNSReply *reply)
|
||
|
{
|
||
|
struct dns_query *query = userdata;
|
||
|
struct auth_client *auth = query->auth;
|
||
|
rb_dlink_node *ptr, *nptr;
|
||
|
bool fail = false;
|
||
|
dns_message response;
|
||
|
|
||
|
if(reply == NULL || auth == NULL)
|
||
|
{
|
||
|
response = REPORT_FAIL;
|
||
|
fail = true;
|
||
|
goto cleanup;
|
||
|
}
|
||
|
|
||
|
if(!sockcmp(&auth->c_addr, &reply->addr, GET_SS_FAMILY(&auth->c_addr)))
|
||
|
{
|
||
|
response = REPORT_FAIL;
|
||
|
fail = true;
|
||
|
goto cleanup;
|
||
|
}
|
||
|
|
||
|
if(strlen(reply->h_name) > HOSTLEN)
|
||
|
{
|
||
|
/* Ah well. */
|
||
|
response = REPORT_TOOLONG;
|
||
|
fail = true;
|
||
|
goto cleanup;
|
||
|
}
|
||
|
|
||
|
rb_strlcpy(auth->hostname, reply->h_name, HOSTLEN + 1);
|
||
|
|
||
|
cleanup:
|
||
|
/* Clean us up off the pending queries list */
|
||
|
RB_DLINK_FOREACH_SAFE(ptr, nptr, queries.head)
|
||
|
{
|
||
|
struct dns_query *query_l = ptr->data;
|
||
|
|
||
|
if(query == query_l)
|
||
|
{
|
||
|
/* Found */
|
||
|
if(fail)
|
||
|
client_fail(query, response);
|
||
|
else
|
||
|
client_success(query);
|
||
|
|
||
|
rb_dlinkDelete(ptr, &queries);
|
||
|
rb_free(query);
|
||
|
return;
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/* Timeout outstanding queries */
|
||
|
static void timeout_dns_queries_event(void *notused)
|
||
|
{
|
||
|
rb_dlink_node *ptr;
|
||
|
|
||
|
/* NOTE - we do not delete queries from the list from a timeout, when
|
||
|
* the query times out later it will be deleted.
|
||
|
*/
|
||
|
RB_DLINK_FOREACH(ptr, queries.head)
|
||
|
{
|
||
|
struct dns_query *query = ptr->data;
|
||
|
|
||
|
if(query->auth && query->timeout < rb_current_time())
|
||
|
{
|
||
|
client_fail(query, REPORT_FAIL);
|
||
|
return;
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static void client_fail(struct dns_query *query, dns_message report)
|
||
|
{
|
||
|
struct auth_client *auth = query->auth;
|
||
|
|
||
|
if(auth)
|
||
|
{
|
||
|
rb_strlcpy(auth->hostname, "*", sizeof(auth->hostname));
|
||
|
notice_client(auth, messages[report]);
|
||
|
provider_done(auth, PROVIDER_RDNS);
|
||
|
query->auth = NULL;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static void client_success(struct dns_query *query)
|
||
|
{
|
||
|
struct auth_client *auth = query->auth;
|
||
|
|
||
|
if(auth)
|
||
|
{
|
||
|
notice_client(auth, messages[REPORT_FOUND]);
|
||
|
provider_done(auth, PROVIDER_RDNS);
|
||
|
query->auth = NULL;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
struct auth_provider rdns_provider =
|
||
|
{
|
||
|
.id = PROVIDER_RDNS,
|
||
|
.init = client_dns_init,
|
||
|
.destroy = client_dns_destroy,
|
||
|
.start = client_dns_start,
|
||
|
.cancel = client_dns_cancel,
|
||
|
.completed = NULL,
|
||
|
};
|