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"
45 struct vlist_node node;
58 static const struct blobmsg_policy service_policy[__SERVICE_MAX] = {
59 [SERVICE_INSTANCE] = { .name = "instance", .type = BLOBMSG_TYPE_STRING },
60 [SERVICE_SERVICE] = { .name = "service", .type = BLOBMSG_TYPE_STRING },
61 [SERVICE_PORT] = { .name = "port", .type = BLOBMSG_TYPE_INT32 },
62 [SERVICE_TXT] = { .name = "txt", .type = BLOBMSG_TYPE_ARRAY },
66 service_update(struct vlist_tree *tree, struct vlist_node *node_new,
67 struct vlist_node *node_old);
69 static struct blob_buf b;
70 static VLIST_TREE(services, avl_strcmp, service_update, false, false);
71 static int service_init_announce;
74 * service_instance_name - construct Service Instance Name as in RFC 6763
76 * RFC 6763 specifies Service Instance Names in the following way:
78 * Service Instance Name = <Instance> . <Service> . <Domain>
80 * @s: service to generate service instance name for
83 service_instance_name(struct service *s)
85 static char buffer[256];
87 snprintf(buffer, sizeof(buffer), "%s.%s", s->instance, s->service);
93 service_add_ptr(const char *host, int ttl)
95 int len = dn_comp(host, mdns_buf, sizeof(mdns_buf), NULL, NULL);
100 dns_add_answer(TYPE_PTR, mdns_buf, len, ttl);
104 service_add_srv(struct service *s, int ttl)
106 struct dns_srv_data *sd = (struct dns_srv_data *) mdns_buf;
107 int len = sizeof(*sd);
109 len += dn_comp(mdns_hostname_local, mdns_buf + len, sizeof(mdns_buf) - len, NULL, NULL);
110 if (len <= sizeof(*sd))
113 sd->port = cpu_to_be16(s->port);
114 dns_add_answer(TYPE_SRV, mdns_buf, len, ttl);
117 #define TOUT_LOOKUP 60
120 service_timeout(struct service *s)
122 time_t t = monotonic_time();
124 if (t - s->t <= TOUT_LOOKUP) {
125 DBG(2, "t=%lu, s->t=%lu, t - s->t = %lu\n", t, s->t, t - s->t);
133 service_reply_single(struct interface *iface, struct sockaddr *to, struct service *s, int ttl, int force)
135 const char *host = service_instance_name(s);
136 char *service = strstr(host, "._");
137 time_t t = service_timeout(s);
140 if (!force && (!s->active || !service || !t))
148 service_add_ptr(service_instance_name(s), ttl);
149 dns_send_answer(iface, to, service);
152 service_add_srv(s, ttl);
153 if (s->txt && s->txt_len)
154 dns_add_answer(TYPE_TXT, (uint8_t *) s->txt, s->txt_len, ttl);
155 dns_send_answer(iface, to, host);
159 service_reply(struct interface *iface, struct sockaddr *to, const char *instance, const char *service_domain, int ttl)
163 vlist_for_each_element(&services, s, node) {
164 if (instance && strcmp(s->instance, instance))
166 if (service_domain && strcmp(s->service, service_domain))
168 service_reply_single(iface, to, s, ttl, 0);
173 service_announce_services(struct interface *iface, struct sockaddr *to, int ttl)
177 vlist_for_each_element(&services, s, node) {
181 service_add_ptr(s->service, ttl);
182 dns_send_answer(iface, to, C_DNS_SD);
184 service_reply_single(iface, to, s, ttl, 0);
189 service_update(struct vlist_tree *tree, struct vlist_node *node_new,
190 struct vlist_node *node_old)
192 struct interface *iface;
196 s = container_of(node_new, struct service, node);
197 if (service_init_announce)
198 vlist_for_each_element(&interfaces, iface, node) {
200 service_reply_single(iface, NULL, s, announce_ttl, 1);
205 s = container_of(node_old, struct service, node);
206 if (!node_new && service_init_announce)
207 vlist_for_each_element(&interfaces, iface, node)
208 service_reply_single(iface, NULL, s, 0, 1);
213 service_load_blob(struct blob_attr *b)
215 struct blob_attr *txt, *_tb[__SERVICE_MAX];
217 char *d_instance, *d_service, *d_id;
222 blobmsg_parse(service_policy, ARRAY_SIZE(service_policy),
223 _tb, blobmsg_data(b), blobmsg_data_len(b));
224 if (!_tb[SERVICE_PORT] || !_tb[SERVICE_SERVICE])
227 if (_tb[SERVICE_TXT])
228 blobmsg_for_each_attr(txt, _tb[SERVICE_TXT], rem2)
229 txt_len += 1 + strlen(blobmsg_get_string(txt));
231 s = calloc_a(sizeof(*s),
232 &d_id, strlen(blobmsg_name(b)) + 1,
233 &d_instance, _tb[SERVICE_INSTANCE] ? strlen(blobmsg_get_string(_tb[SERVICE_INSTANCE])) + 1 : 0,
234 &d_service, strlen(blobmsg_get_string(_tb[SERVICE_SERVICE])) + 1,
239 s->port = blobmsg_get_u32(_tb[SERVICE_PORT]);
240 s->id = strcpy(d_id, blobmsg_name(b));
241 if (_tb[SERVICE_INSTANCE])
242 s->instance = strcpy(d_instance, blobmsg_get_string(_tb[SERVICE_INSTANCE]));
244 s->instance = umdns_host_label;
245 s->service = strcpy(d_service, blobmsg_get_string(_tb[SERVICE_SERVICE]));
248 s->txt_len = txt_len;
251 if (_tb[SERVICE_TXT])
252 blobmsg_for_each_attr(txt, _tb[SERVICE_TXT], rem2) {
253 int len = strlen(blobmsg_get_string(txt));
260 memcpy(d_txt, blobmsg_get_string(txt), len);
264 vlist_add(&services, &s->node, s->id);
268 service_load(char *path)
270 struct blob_attr *cur;
274 if (glob(path, GLOB_NOESCAPE | GLOB_MARK, NULL, &gl))
277 for (i = 0; i < gl.gl_pathc; i++) {
278 blob_buf_init(&b, 0);
279 if (blobmsg_add_json_from_file(&b, gl.gl_pathv[i])) {
280 blob_for_each_attr(cur, b.head, rem)
281 service_load_blob(cur);
283 fprintf(stderr, "Error reading %s JSON\n", gl.gl_pathv[i]);
290 service_init_cb(struct ubus_request *req, int type, struct blob_attr *msg)
292 struct blob_attr *cur;
297 vlist_update(&services);
298 service_load("/etc/umdns/*");
300 blob_for_each_attr(cur, msg, rem) {
301 struct blob_attr *cur2;
304 blobmsg_for_each_attr(cur2, cur, rem2) {
305 struct blob_attr *cur3;
308 if (strcmp(blobmsg_name(cur2), "instances"))
311 blobmsg_for_each_attr(cur3, cur2, rem3) {
312 struct blob_attr *cur4;
316 blobmsg_for_each_attr(cur4, cur3, rem4) {
317 const char *name = blobmsg_name(cur4);
319 if (!strcmp(name, "running")) {
320 running = blobmsg_get_bool(cur4);
321 } else if (running && !strcmp(name, "data")) {
322 struct blob_attr *cur5;
325 blobmsg_for_each_attr(cur5, cur4, rem5) {
326 struct blob_attr *cur6;
329 if (strcmp(blobmsg_name(cur5), "mdns"))
332 blobmsg_for_each_attr(cur6, cur5, rem6)
333 service_load_blob(cur6);
341 vlist_flush(&services);
345 service_init(int announce)
349 service_init_announce = announce;
350 ubus_service_list(service_init_cb);
354 service_cleanup(void)
356 vlist_flush(&services);