2 dns.c -- hostname resolving functions
3 Copyright (C) 2019 Guus Sliepen <guus@meshlink.io>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License along
16 with this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
28 typedef struct adns_item {
38 static void *adns_loop(void *data) {
39 meshlink_handle_t *mesh = data;
42 adns_item_t *item = meshlink_queue_pop_cond(&mesh->adns_queue, &mesh->adns_cond);
48 if(time(NULL) < item->deadline) {
49 logger(mesh, MESHLINK_DEBUG, "Resolving %s port %s", item->host, item->serv);
50 int result = getaddrinfo(item->host, item->serv, NULL, &item->ai);
57 logger(mesh, MESHLINK_WARNING, "Deadline passed for DNS request %s port %s", item->host, item->serv);
59 item->err = ETIMEDOUT;
62 if(meshlink_queue_push(&mesh->adns_done_queue, item)) {
63 signal_trigger(&mesh->loop, &mesh->adns_signal);
74 static void adns_cb_handler(event_loop_t *loop, void *data) {
76 meshlink_handle_t *mesh = data;
78 for(adns_item_t *item; (item = meshlink_queue_pop(&mesh->adns_done_queue));) {
79 item->cb(mesh, item->host, item->serv, item->data, item->ai, item->err);
84 extern void init_adns(meshlink_handle_t *mesh) {
85 signal_add(&mesh->loop, &mesh->adns_signal, adns_cb_handler, mesh, 1);
86 meshlink_queue_init(&mesh->adns_queue);
87 pthread_create(&mesh->adns_thread, NULL, adns_loop, mesh);
90 extern void exit_adns(meshlink_handle_t *mesh) {
91 if(!mesh->adns_signal.cb) {
95 /* Drain the queue of any pending ADNS requests */
96 for(adns_item_t *item; (item = meshlink_queue_pop(&mesh->adns_queue));) {
102 /* Signal the ADNS thread to stop */
103 if(!meshlink_queue_push(&mesh->adns_queue, NULL)) {
107 pthread_cond_signal(&mesh->adns_cond);
109 pthread_join(mesh->adns_thread, NULL);
110 meshlink_queue_exit(&mesh->adns_queue);
111 signal_del(&mesh->loop, &mesh->adns_signal);
114 extern void adns_queue(meshlink_handle_t *mesh, char *host, char *serv, adns_cb_t cb, void *data, int timeout) {
115 adns_item_t *item = xmalloc(sizeof(*item));
118 item->deadline = time(NULL) + timeout;
122 logger(mesh, MESHLINK_DEBUG, "Enqueueing DNS request for %s port %s", item->host, item->serv);
124 if(!meshlink_queue_push(&mesh->adns_queue, item)) {
128 pthread_cond_signal(&mesh->adns_cond);