mirror of
https://github.com/matrix-construct/construct
synced 2024-09-08 01:35:39 +02:00
211 lines
5 KiB
C
211 lines
5 KiB
C
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/* authd/providers/rdns.c - rDNS lookup provider for authd
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* Copyright (c) 2016 Elizabeth Myers <elizabeth@interlinked.me>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice is present in all copies.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "stdinc.h"
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#include "rb_commio.h"
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#include "authd.h"
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#include "provider.h"
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#include "res.h"
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#include "dns.h"
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struct user_query
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{
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rb_dlink_node node;
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struct auth_client *auth; /* Our client */
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struct dns_query *query; /* Pending DNS query */
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time_t timeout; /* When the request times out */
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};
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/* Goinked from old s_auth.c --Elizabeth */
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static const char *messages[] =
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{
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"*** Looking up your hostname...",
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"*** Found your hostname",
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"*** Couldn't look up your hostname",
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"*** Your hostname is too long, ignoring hostname",
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};
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typedef enum
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{
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REPORT_LOOKUP,
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REPORT_FOUND,
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REPORT_FAIL,
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REPORT_TOOLONG,
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} dns_message;
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static void client_fail(struct user_query *query, dns_message message);
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static void client_success(struct user_query *query);
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static void get_dns_answer(const char *res, bool status, query_type type, void *data);
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static struct ev_entry *timeout_ev;
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static EVH timeout_dns_queries_event;
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static int rdns_timeout = 30;
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static rb_dlink_list queries; /* Stored here for easy timeout */
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bool client_dns_init(void)
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{
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timeout_ev = rb_event_addish("timeout_dns_queries_event", timeout_dns_queries_event, NULL, 5);
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return (timeout_ev != NULL);
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}
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void client_dns_destroy(void)
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{
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rb_dlink_node *ptr, *nptr;
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struct user_query *query;
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RB_DLINK_FOREACH_SAFE(ptr, nptr, queries.head)
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{
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client_fail(ptr->data, REPORT_FAIL);
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rb_dlinkDelete(ptr, &queries);
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rb_free(ptr);
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}
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rb_event_delete(timeout_ev);
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}
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bool client_dns_start(struct auth_client *auth)
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{
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struct user_query *query = rb_malloc(sizeof(struct user_query));
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query->auth = auth;
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query->timeout = rb_current_time() + rdns_timeout;
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query->query = lookup_hostname(auth->c_ip, get_dns_answer, query);
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notice_client(auth, messages[REPORT_LOOKUP]);
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set_provider(auth, PROVIDER_RDNS);
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return true;
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}
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void client_dns_cancel(struct auth_client *auth)
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{
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rb_dlink_node *ptr, *nptr;
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RB_DLINK_FOREACH_SAFE(ptr, nptr, queries.head)
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{
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struct user_query *query = ptr->data;
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if(query->auth == auth)
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{
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/* Victim found */
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client_fail(query, REPORT_FAIL);
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rb_dlinkDelete(ptr, &queries);
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rb_free(query);
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return;
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}
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}
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}
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static void
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get_dns_answer(const char *res, bool status, query_type type, void *data)
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{
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struct user_query *query = data;
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struct auth_client *auth = query->auth;
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bool fail = false;
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dns_message response;
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rb_dlink_node *ptr, *nptr;
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if(res == NULL || status == false)
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{
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response = REPORT_FAIL;
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fail = true;
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goto cleanup;
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}
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else if(strlen(res) > HOSTLEN)
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{
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/* Ah well. */
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response = REPORT_TOOLONG;
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fail = true;
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goto cleanup;
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}
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rb_strlcpy(auth->hostname, res, HOSTLEN + 1);
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cleanup:
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/* Clean us up off the pending queries list */
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RB_DLINK_FOREACH_SAFE(ptr, nptr, queries.head)
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{
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struct user_query *query_l = ptr->data;
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if(query == query_l)
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{
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/* Found */
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if(fail)
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client_fail(query, response);
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else
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client_success(query);
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rb_dlinkDelete(ptr, &queries);
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rb_free(query);
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return;
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}
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}
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}
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/* Timeout outstanding queries */
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static void timeout_dns_queries_event(void *notused)
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{
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rb_dlink_node *ptr, *nptr;
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RB_DLINK_FOREACH_SAFE(ptr, nptr, queries.head)
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{
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struct user_query *query = ptr->data;
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if(query->auth && query->timeout < rb_current_time())
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{
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client_fail(query, REPORT_FAIL);
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rb_dlinkDelete(ptr, &queries);
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rb_free(query);
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return;
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}
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}
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}
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static void client_fail(struct user_query *query, dns_message report)
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{
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struct auth_client *auth = query->auth;
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rb_strlcpy(auth->hostname, "*", sizeof(auth->hostname));
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notice_client(auth, messages[report]);
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cancel_query(query->query);
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provider_done(auth, PROVIDER_RDNS);
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}
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static void client_success(struct user_query *query)
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{
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struct auth_client *auth = query->auth;
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notice_client(auth, messages[REPORT_FOUND]);
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cancel_query(query->query);
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provider_done(auth, PROVIDER_RDNS);
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}
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struct auth_provider rdns_provider =
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{
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.id = PROVIDER_RDNS,
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.init = client_dns_init,
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.destroy = client_dns_destroy,
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.start = client_dns_start,
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.cancel = client_dns_cancel,
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.completed = NULL,
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};
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