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 static char *sdudp = "_services._dns-sd._udp.local";
69 static char *sdtcp = "_services._dns-sd._tcp.local";
70 static int service_init_announce;
73 service_name(const char *domain)
75 static char buffer[256];
77 snprintf(buffer, sizeof(buffer), "%s.%s", mdns_hostname, domain);
83 service_add_ptr(const char *host, int ttl)
85 int len = dn_comp(host, mdns_buf, sizeof(mdns_buf), NULL, NULL);
90 dns_add_answer(TYPE_PTR, mdns_buf, len, ttl);
94 service_add_srv(struct service *s, int ttl)
96 struct dns_srv_data *sd = (struct dns_srv_data *) mdns_buf;
97 int len = sizeof(*sd);
99 len += dn_comp(mdns_hostname_local, mdns_buf + len, sizeof(mdns_buf) - len, NULL, NULL);
100 if (len <= sizeof(*sd))
103 sd->port = cpu_to_be16(s->port);
104 dns_add_answer(TYPE_SRV, mdns_buf, len, ttl);
107 #define TOUT_LOOKUP 60
110 service_timeout(struct service *s)
112 time_t t = monotonic_time();
114 if (t - s->t <= TOUT_LOOKUP)
121 service_reply_single(struct interface *iface, struct service *s, const char *match, int ttl, int force)
123 const char *host = service_name(s->service);
124 char *service = strstr(host, "._");
125 time_t t = service_timeout(s);
128 if (!force && (!s->active || !service || !t))
133 if (match && strcmp(match, s->service))
139 service_add_ptr(service_name(s->service), ttl);
140 dns_send_answer(iface, service);
143 service_add_srv(s, ttl);
144 if (s->txt && s->txt_len)
145 dns_add_answer(TYPE_TXT, (uint8_t *) s->txt, s->txt_len, ttl);
146 dns_send_answer(iface, host);
150 service_reply(struct interface *iface, const char *match, int ttl)
154 vlist_for_each_element(&services, s, node)
155 service_reply_single(iface, s, match, ttl, 0);
159 service_announce_services(struct interface *iface, const char *service, int ttl)
164 if (!strcmp(service, sdudp))
166 else if (strcmp(service, sdtcp))
169 vlist_for_each_element(&services, s, node) {
170 if (!strstr(s->service, "._tcp") && tcp)
172 if (!strstr(s->service, "._udp") && !tcp)
177 service_add_ptr(s->service, ttl);
179 dns_send_answer(iface, sdtcp);
181 dns_send_answer(iface, sdudp);
183 service_reply(iface, s->service, ttl);
188 service_announce(struct interface *iface, int ttl)
190 service_announce_services(iface, sdudp, ttl);
191 service_announce_services(iface, sdtcp, ttl);
195 service_update(struct vlist_tree *tree, struct vlist_node *node_new,
196 struct vlist_node *node_old)
198 struct interface *iface;
202 s = container_of(node_new, struct service, node);
203 if (service_init_announce)
204 vlist_for_each_element(&interfaces, iface, node) {
206 service_reply_single(iface, s, NULL, announce_ttl, 1);
211 s = container_of(node_old, struct service, node);
212 if (!node_new && service_init_announce)
213 vlist_for_each_element(&interfaces, iface, node)
214 service_reply_single(iface, s, NULL, 0, 1);
219 service_load_blob(struct blob_attr *b)
221 struct blob_attr *txt, *_tb[__SERVICE_MAX];
223 char *d_service, *d_id;
228 blobmsg_parse(service_policy, ARRAY_SIZE(service_policy),
229 _tb, blobmsg_data(b), blobmsg_data_len(b));
230 if (!_tb[SERVICE_PORT] || !_tb[SERVICE_SERVICE])
233 if (_tb[SERVICE_SERVICE])
234 blobmsg_for_each_attr(txt, _tb[SERVICE_TXT], rem2)
235 txt_len += 1 + strlen(blobmsg_get_string(txt));
237 s = calloc_a(sizeof(*s),
238 &d_id, strlen(blobmsg_name(b)) + 1,
239 &d_service, strlen(blobmsg_get_string(_tb[SERVICE_SERVICE])) + 1,
244 s->port = blobmsg_get_u32(_tb[SERVICE_PORT]);
245 s->id = strcpy(d_id, blobmsg_name(b));
246 s->service = strcpy(d_service, blobmsg_get_string(_tb[SERVICE_SERVICE]));
249 s->txt_len = txt_len;
252 if (_tb[SERVICE_SERVICE])
253 blobmsg_for_each_attr(txt, _tb[SERVICE_TXT], rem2) {
254 int len = strlen(blobmsg_get_string(txt));
261 memcpy(d_txt, blobmsg_get_string(txt), len);
265 vlist_add(&services, &s->node, s->id);
269 service_load(char *path)
271 struct blob_attr *cur;
275 if (glob(path, GLOB_NOESCAPE | GLOB_MARK, NULL, &gl))
278 for (i = 0; i < gl.gl_pathc; i++) {
279 blob_buf_init(&b, 0);
280 if (blobmsg_add_json_from_file(&b, gl.gl_pathv[i]))
281 blob_for_each_attr(cur, b.head, rem)
282 service_load_blob(cur);
288 service_init_cb(struct ubus_request *req, int type, struct blob_attr *msg)
290 struct blob_attr *cur;
295 vlist_update(&services);
296 service_load("/tmp/run/mdns/*");
298 blob_for_each_attr(cur, msg, rem) {
299 struct blob_attr *cur2;
302 blobmsg_for_each_attr(cur2, cur, rem2) {
303 struct blob_attr *cur3;
306 if (strcmp(blobmsg_name(cur2), "instances"))
309 blobmsg_for_each_attr(cur3, cur2, rem3) {
310 struct blob_attr *cur4;
314 blobmsg_for_each_attr(cur4, cur3, rem4) {
315 const char *name = blobmsg_name(cur4);
317 if (!strcmp(name, "running")) {
318 running = blobmsg_get_bool(cur4);
319 } else if (running && !strcmp(name, "data")) {
320 struct blob_attr *cur5;
323 blobmsg_for_each_attr(cur5, cur4, rem5) {
324 struct blob_attr *cur6;
327 if (strcmp(blobmsg_name(cur5), "mdns"))
330 blobmsg_for_each_attr(cur6, cur5, rem6)
331 service_load_blob(cur6);
339 vlist_flush(&services);
343 service_init(int announce)
347 service_init_announce = announce;
348 ubus_service_list(service_init_cb);
352 service_cleanup(void)
354 vlist_flush(&services);