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 type, 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);
191 service_reply_a(iface, TYPE_A, ttl);
195 service_announce_services(struct interface *iface, const char *service)
200 if (!strcmp(service, sdudp))
202 else if (strcmp(service, sdtcp))
205 vlist_for_each_element(&services, s, node) {
206 if (!strstr(s->service, "._tcp") && tcp)
208 if (!strstr(s->service, "._udp") && !tcp)
212 service_add_ptr(s->service, announce_ttl);
214 dns_send_answer(iface, sdtcp);
216 dns_send_answer(iface, sdudp);
217 service_reply(iface, s->service, announce_ttl);
222 service_announce(struct interface *iface)
224 service_announce_services(iface, sdudp);
225 service_announce_services(iface, sdtcp);
229 service_update(struct vlist_tree *tree, struct vlist_node *node_new,
230 struct vlist_node *node_old)
232 struct interface *iface;
236 s = container_of(node_new, struct service, node);
237 if (service_init_announce)
238 vlist_for_each_element(&interfaces, iface, node) {
240 service_reply_single(iface, s, NULL, announce_ttl, 1);
245 s = container_of(node_old, struct service, node);
246 if (!node_new && service_init_announce)
247 vlist_for_each_element(&interfaces, iface, node)
248 service_reply_single(iface, s, NULL, 0, 1);
253 service_load_blob(struct blob_attr *b)
255 struct blob_attr *txt, *_tb[__SERVICE_MAX];
257 char *d_service, *d_id;
262 blobmsg_parse(service_policy, ARRAY_SIZE(service_policy),
263 _tb, blobmsg_data(b), blobmsg_data_len(b));
264 if (!_tb[SERVICE_PORT] || !_tb[SERVICE_SERVICE])
267 if (_tb[SERVICE_SERVICE])
268 blobmsg_for_each_attr(txt, _tb[SERVICE_TXT], rem2)
269 txt_len += 1 + strlen(blobmsg_get_string(txt));
271 s = calloc_a(sizeof(*s),
272 &d_id, strlen(blobmsg_name(b)) + 1,
273 &d_service, strlen(blobmsg_get_string(_tb[SERVICE_SERVICE])) + 1,
278 s->port = blobmsg_get_u32(_tb[SERVICE_PORT]);
279 s->id = strcpy(d_id, blobmsg_name(b));
280 s->service = strcpy(d_service, blobmsg_get_string(_tb[SERVICE_SERVICE]));
283 s->txt_len = txt_len;
286 if (_tb[SERVICE_SERVICE])
287 blobmsg_for_each_attr(txt, _tb[SERVICE_TXT], rem2) {
288 int len = strlen(blobmsg_get_string(txt));
295 memcpy(d_txt, blobmsg_get_string(txt), len);
299 vlist_add(&services, &s->node, s->id);
303 service_load(char *path)
305 struct blob_attr *cur;
309 if (glob(path, GLOB_NOESCAPE | GLOB_MARK, NULL, &gl))
312 for (i = 0; i < gl.gl_pathc; i++) {
313 blob_buf_init(&b, 0);
314 if (blobmsg_add_json_from_file(&b, gl.gl_pathv[i]))
315 blob_for_each_attr(cur, b.head, rem)
316 service_load_blob(cur);
322 service_init_cb(struct ubus_request *req, int type, struct blob_attr *msg)
324 struct blob_attr *cur;
329 vlist_update(&services);
330 service_load("/tmp/run/mdns/*");
332 blob_for_each_attr(cur, msg, rem) {
333 struct blob_attr *cur2;
336 blobmsg_for_each_attr(cur2, cur, rem2) {
337 struct blob_attr *cur3;
340 if (strcmp(blobmsg_name(cur2), "instances"))
343 blobmsg_for_each_attr(cur3, cur2, rem3) {
344 struct blob_attr *cur4;
348 blobmsg_for_each_attr(cur4, cur3, rem4) {
349 const char *name = blobmsg_name(cur4);
351 if (!strcmp(name, "running")) {
352 running = blobmsg_get_bool(cur4);
353 } else if (running && !strcmp(name, "data")) {
354 struct blob_attr *cur5;
357 blobmsg_for_each_attr(cur5, cur4, rem5) {
358 struct blob_attr *cur6;
361 if (strcmp(blobmsg_name(cur5), "mdns"))
364 blobmsg_for_each_attr(cur6, cur5, rem6)
365 service_load_blob(cur6);
373 vlist_flush(&services);
377 service_init(int announce)
381 service_init_announce = announce;
382 ubus_service_list(service_init_cb);
386 service_cleanup(void)
388 vlist_flush(&services);