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>
28 #include <libubox/vlist.h>
29 #include <libubox/uloop.h>
30 #include <libubox/avl-cmp.h>
31 #include <libubox/blobmsg_json.h>
37 #include "interface.h"
48 struct vlist_node node;
60 static const struct blobmsg_policy service_policy[__SERVICE_MAX] = {
61 [SERVICE_SERVICE] = { .name = "service", .type = BLOBMSG_TYPE_STRING },
62 [SERVICE_PORT] = { .name = "port", .type = BLOBMSG_TYPE_INT32 },
63 [SERVICE_TXT] = { .name = "txt", .type = BLOBMSG_TYPE_ARRAY },
67 service_update(struct vlist_tree *tree, struct vlist_node *node_new,
68 struct vlist_node *node_old);
70 static struct blob_buf b;
71 static VLIST_TREE(services, avl_strcmp, service_update, false, false);
72 static char *sdudp = "_services._dns-sd._udp.local";
73 static char *sdtcp = "_services._dns-sd._tcp.local";
74 static int service_init_announce;
77 service_name(const char *domain)
79 static char buffer[256];
81 snprintf(buffer, sizeof(buffer), "%s.%s", mdns_hostname, domain);
87 service_add_ptr(const char *host, int ttl)
89 int len = dn_comp(host, mdns_buf, sizeof(mdns_buf), NULL, NULL);
94 dns_add_answer(TYPE_PTR, mdns_buf, len, ttl);
98 service_add_srv(struct service *s, int ttl)
100 struct dns_srv_data *sd = (struct dns_srv_data *) mdns_buf;
101 int len = sizeof(*sd);
103 len += dn_comp(mdns_hostname_local, mdns_buf + len, sizeof(mdns_buf) - len, NULL, NULL);
104 if (len <= sizeof(*sd))
107 sd->port = cpu_to_be16(s->port);
108 dns_add_answer(TYPE_SRV, mdns_buf, len, ttl);
111 #define TOUT_LOOKUP 60
114 service_timeout(struct service *s)
116 time_t t = time(NULL);
118 if (t - s->t <= TOUT_LOOKUP)
127 service_reply_a(struct interface *iface, int ttl)
129 struct ifaddrs *ifap, *ifa;
130 struct sockaddr_in *sa;
131 struct sockaddr_in6 *sa6;
136 for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
137 if (strcmp(ifa->ifa_name, iface->name))
139 if (ifa->ifa_addr->sa_family == AF_INET) {
140 sa = (struct sockaddr_in *) ifa->ifa_addr;
141 dns_add_answer(TYPE_A, (uint8_t *) &sa->sin_addr, 4, ttl);
143 if (ifa->ifa_addr->sa_family == AF_INET6) {
144 uint8_t ll_prefix[] = {0xfe, 0x80 };
145 sa6 = (struct sockaddr_in6 *) ifa->ifa_addr;
146 if (!memcmp(&sa6->sin6_addr, &ll_prefix, 2))
147 dns_add_answer(TYPE_AAAA, (uint8_t *) &sa6->sin6_addr, 16, ttl);
150 dns_send_answer(iface, mdns_hostname_local);
156 service_reply_single(struct interface *iface, struct service *s, const char *match, int ttl, int force)
158 const char *host = service_name(s->service);
159 char *service = strstr(host, "._");
161 if (!force && (!s->active || !service || !service_timeout(s)))
166 if (match && strcmp(match, s->service))
170 service_add_ptr(service_name(s->service), ttl);
171 dns_send_answer(iface, service);
174 service_add_srv(s, ttl);
175 if (s->txt && s->txt_len)
176 dns_add_answer(TYPE_TXT, (uint8_t *) s->txt, s->txt_len, ttl);
177 dns_send_answer(iface, host);
181 service_reply(struct interface *iface, const char *match, int ttl)
185 vlist_for_each_element(&services, s, node)
186 service_reply_single(iface, s, match, ttl, 0);
192 service_reply_a(iface, ttl);
196 service_announce_services(struct interface *iface, const char *service, int ttl)
201 if (!strcmp(service, sdudp))
203 else if (strcmp(service, sdtcp))
206 vlist_for_each_element(&services, s, node) {
207 if (!strstr(s->service, "._tcp") && tcp)
209 if (!strstr(s->service, "._udp") && !tcp)
214 service_add_ptr(s->service, ttl);
216 dns_send_answer(iface, sdtcp);
218 dns_send_answer(iface, sdudp);
220 service_reply(iface, s->service, ttl);
225 service_announce(struct interface *iface, int ttl)
227 service_announce_services(iface, sdudp, ttl);
228 service_announce_services(iface, sdtcp, ttl);
232 service_update(struct vlist_tree *tree, struct vlist_node *node_new,
233 struct vlist_node *node_old)
235 struct interface *iface;
239 s = container_of(node_new, struct service, node);
240 if (service_init_announce)
241 vlist_for_each_element(&interfaces, iface, node) {
243 service_reply_single(iface, s, NULL, announce_ttl, 1);
248 s = container_of(node_old, struct service, node);
249 if (!node_new && service_init_announce)
250 vlist_for_each_element(&interfaces, iface, node)
251 service_reply_single(iface, s, NULL, 0, 1);
256 service_load_blob(struct blob_attr *b)
258 struct blob_attr *txt, *_tb[__SERVICE_MAX];
260 char *d_service, *d_id;
265 blobmsg_parse(service_policy, ARRAY_SIZE(service_policy),
266 _tb, blobmsg_data(b), blobmsg_data_len(b));
267 if (!_tb[SERVICE_PORT] || !_tb[SERVICE_SERVICE])
270 if (_tb[SERVICE_SERVICE])
271 blobmsg_for_each_attr(txt, _tb[SERVICE_TXT], rem2)
272 txt_len += 1 + strlen(blobmsg_get_string(txt));
274 s = calloc_a(sizeof(*s),
275 &d_id, strlen(blobmsg_name(b)) + 1,
276 &d_service, strlen(blobmsg_get_string(_tb[SERVICE_SERVICE])) + 1,
281 s->port = blobmsg_get_u32(_tb[SERVICE_PORT]);
282 s->id = strcpy(d_id, blobmsg_name(b));
283 s->service = strcpy(d_service, blobmsg_get_string(_tb[SERVICE_SERVICE]));
286 s->txt_len = txt_len;
289 if (_tb[SERVICE_SERVICE])
290 blobmsg_for_each_attr(txt, _tb[SERVICE_TXT], rem2) {
291 int len = strlen(blobmsg_get_string(txt));
298 memcpy(d_txt, blobmsg_get_string(txt), len);
302 vlist_add(&services, &s->node, s->id);
306 service_load(char *path)
308 struct blob_attr *cur;
312 if (glob(path, GLOB_NOESCAPE | GLOB_MARK, NULL, &gl))
315 for (i = 0; i < gl.gl_pathc; i++) {
316 blob_buf_init(&b, 0);
317 if (blobmsg_add_json_from_file(&b, gl.gl_pathv[i]))
318 blob_for_each_attr(cur, b.head, rem)
319 service_load_blob(cur);
325 service_init_cb(struct ubus_request *req, int type, struct blob_attr *msg)
327 struct blob_attr *cur;
332 vlist_update(&services);
333 service_load("/tmp/run/mdns/*");
335 blob_for_each_attr(cur, msg, rem) {
336 struct blob_attr *cur2;
339 blobmsg_for_each_attr(cur2, cur, rem2) {
340 struct blob_attr *cur3;
343 if (strcmp(blobmsg_name(cur2), "instances"))
346 blobmsg_for_each_attr(cur3, cur2, rem3) {
347 struct blob_attr *cur4;
351 blobmsg_for_each_attr(cur4, cur3, rem4) {
352 const char *name = blobmsg_name(cur4);
354 if (!strcmp(name, "running")) {
355 running = blobmsg_get_bool(cur4);
356 } else if (running && !strcmp(name, "data")) {
357 struct blob_attr *cur5;
360 blobmsg_for_each_attr(cur5, cur4, rem5) {
361 struct blob_attr *cur6;
364 if (strcmp(blobmsg_name(cur5), "mdns"))
367 blobmsg_for_each_attr(cur6, cur5, rem6)
368 service_load_blob(cur6);
376 vlist_flush(&services);
380 service_init(int announce)
384 service_init_announce = announce;
385 ubus_service_list(service_init_cb);
389 service_cleanup(void)
391 vlist_flush(&services);