2 * Copyright (C) 2014 John Crispin <blogic@openwrt.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU Lesser General Public License version 2.1
6 * as published by the Free Software Foundation
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
14 #include <sys/types.h>
15 #include <arpa/nameser.h>
16 #include <sys/socket.h>
24 #include <libubox/vlist.h>
25 #include <libubox/uloop.h>
26 #include <libubox/avl-cmp.h>
27 #include <libubox/blobmsg_json.h>
33 #include "interface.h"
44 struct vlist_node node;
56 static const struct blobmsg_policy service_policy[__SERVICE_MAX] = {
57 [SERVICE_SERVICE] = { .name = "service", .type = BLOBMSG_TYPE_STRING },
58 [SERVICE_PORT] = { .name = "port", .type = BLOBMSG_TYPE_INT32 },
59 [SERVICE_TXT] = { .name = "txt", .type = BLOBMSG_TYPE_ARRAY },
63 service_update(struct vlist_tree *tree, struct vlist_node *node_new,
64 struct vlist_node *node_old);
66 static struct blob_buf b;
67 static VLIST_TREE(services, avl_strcmp, service_update, false, false);
68 char *sdudp = "_services._dns-sd._udp.local";
69 static int service_init_announce;
72 service_name(const char *domain)
74 static char buffer[256];
76 snprintf(buffer, sizeof(buffer), "%s.%s", mdns_hostname, domain);
82 service_add_ptr(const char *host, int ttl)
84 int len = dn_comp(host, mdns_buf, sizeof(mdns_buf), NULL, NULL);
89 dns_add_answer(TYPE_PTR, mdns_buf, len, ttl);
93 service_add_srv(struct service *s, int ttl)
95 struct dns_srv_data *sd = (struct dns_srv_data *) mdns_buf;
96 int len = sizeof(*sd);
98 len += dn_comp(mdns_hostname_local, mdns_buf + len, sizeof(mdns_buf) - len, NULL, NULL);
99 if (len <= sizeof(*sd))
102 sd->port = cpu_to_be16(s->port);
103 dns_add_answer(TYPE_SRV, mdns_buf, len, ttl);
106 #define TOUT_LOOKUP 60
109 service_timeout(struct service *s)
111 time_t t = monotonic_time();
113 if (t - s->t <= TOUT_LOOKUP)
120 service_reply_single(struct interface *iface, struct service *s, int ttl, int force)
122 const char *host = service_name(s->service);
123 char *service = strstr(host, "._");
124 time_t t = service_timeout(s);
127 if (!force && (!s->active || !service || !t))
135 service_add_ptr(service_name(s->service), ttl);
136 dns_send_answer(iface, service);
139 service_add_srv(s, ttl);
140 if (s->txt && s->txt_len)
141 dns_add_answer(TYPE_TXT, (uint8_t *) s->txt, s->txt_len, ttl);
142 dns_send_answer(iface, host);
146 service_reply(struct interface *iface, const char *match, int ttl)
150 vlist_for_each_element(&services, s, node) {
151 if (!match || !strcmp(s->service, match))
152 service_reply_single(iface, s, ttl, 0);
157 service_announce_services(struct interface *iface, int ttl)
161 vlist_for_each_element(&services, s, node) {
165 service_add_ptr(s->service, ttl);
166 dns_send_answer(iface, sdudp);
168 service_reply_single(iface, s, ttl, 0);
173 service_announce(struct interface *iface, int ttl)
175 service_announce_services(iface, ttl);
179 service_update(struct vlist_tree *tree, struct vlist_node *node_new,
180 struct vlist_node *node_old)
182 struct interface *iface;
186 s = container_of(node_new, struct service, node);
187 if (service_init_announce)
188 vlist_for_each_element(&interfaces, iface, node) {
190 service_reply_single(iface, s, announce_ttl, 1);
195 s = container_of(node_old, struct service, node);
196 if (!node_new && service_init_announce)
197 vlist_for_each_element(&interfaces, iface, node)
198 service_reply_single(iface, s, 0, 1);
203 service_load_blob(struct blob_attr *b)
205 struct blob_attr *txt, *_tb[__SERVICE_MAX];
207 char *d_service, *d_id;
212 blobmsg_parse(service_policy, ARRAY_SIZE(service_policy),
213 _tb, blobmsg_data(b), blobmsg_data_len(b));
214 if (!_tb[SERVICE_PORT] || !_tb[SERVICE_SERVICE])
217 if (_tb[SERVICE_TXT])
218 blobmsg_for_each_attr(txt, _tb[SERVICE_TXT], rem2)
219 txt_len += 1 + strlen(blobmsg_get_string(txt));
221 s = calloc_a(sizeof(*s),
222 &d_id, strlen(blobmsg_name(b)) + 1,
223 &d_service, strlen(blobmsg_get_string(_tb[SERVICE_SERVICE])) + 1,
228 s->port = blobmsg_get_u32(_tb[SERVICE_PORT]);
229 s->id = strcpy(d_id, blobmsg_name(b));
230 s->service = strcpy(d_service, blobmsg_get_string(_tb[SERVICE_SERVICE]));
233 s->txt_len = txt_len;
236 if (_tb[SERVICE_TXT])
237 blobmsg_for_each_attr(txt, _tb[SERVICE_TXT], rem2) {
238 int len = strlen(blobmsg_get_string(txt));
245 memcpy(d_txt, blobmsg_get_string(txt), len);
249 vlist_add(&services, &s->node, s->id);
253 service_load(char *path)
255 struct blob_attr *cur;
259 if (glob(path, GLOB_NOESCAPE | GLOB_MARK, NULL, &gl))
262 for (i = 0; i < gl.gl_pathc; i++) {
263 blob_buf_init(&b, 0);
264 if (blobmsg_add_json_from_file(&b, gl.gl_pathv[i]))
265 blob_for_each_attr(cur, b.head, rem)
266 service_load_blob(cur);
272 service_init_cb(struct ubus_request *req, int type, struct blob_attr *msg)
274 struct blob_attr *cur;
279 vlist_update(&services);
280 service_load("/tmp/run/mdns/*");
282 blob_for_each_attr(cur, msg, rem) {
283 struct blob_attr *cur2;
286 blobmsg_for_each_attr(cur2, cur, rem2) {
287 struct blob_attr *cur3;
290 if (strcmp(blobmsg_name(cur2), "instances"))
293 blobmsg_for_each_attr(cur3, cur2, rem3) {
294 struct blob_attr *cur4;
298 blobmsg_for_each_attr(cur4, cur3, rem4) {
299 const char *name = blobmsg_name(cur4);
301 if (!strcmp(name, "running")) {
302 running = blobmsg_get_bool(cur4);
303 } else if (running && !strcmp(name, "data")) {
304 struct blob_attr *cur5;
307 blobmsg_for_each_attr(cur5, cur4, rem5) {
308 struct blob_attr *cur6;
311 if (strcmp(blobmsg_name(cur5), "mdns"))
314 blobmsg_for_each_attr(cur6, cur5, rem6)
315 service_load_blob(cur6);
323 vlist_flush(&services);
327 service_init(int announce)
331 service_init_announce = announce;
332 ubus_service_list(service_init_cb);
336 service_cleanup(void)
338 vlist_flush(&services);