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>
26 #include <libubox/vlist.h>
27 #include <libubox/uloop.h>
28 #include <libubox/avl-cmp.h>
29 #include <libubox/blobmsg_json.h>
34 #include "interface.h"
43 struct vlist_node node;
55 static const struct blobmsg_policy service_policy[__SERVICE_MAX] = {
56 [SERVICE_PORT] = { .name = "port", .type = BLOBMSG_TYPE_INT32 },
57 [SERVICE_TXT] = { .name = "txt", .type = BLOBMSG_TYPE_ARRAY },
60 static const struct uci_blob_param_list service_attr_list = {
61 .n_params = __SERVICE_MAX,
62 .params = service_policy,
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 char *sdudp = "_services._dns-sd._udp.local";
72 static char *sdtcp = "_services._dns-sd._tcp.local";
75 service_name(const char *domain)
77 static char buffer[256];
79 snprintf(buffer, sizeof(buffer), "%s.%s", mdns_hostname, domain);
85 service_add_ptr(const char *host)
87 int len = dn_comp(host, mdns_buf, sizeof(mdns_buf), NULL, NULL);
92 dns_add_answer(TYPE_PTR, mdns_buf, len);
96 service_add_srv(struct service *s)
98 struct dns_srv_data *sd = (struct dns_srv_data *) mdns_buf;
99 int len = sizeof(*sd);
101 len += dn_comp(mdns_hostname_local, mdns_buf + len, sizeof(mdns_buf) - len, NULL, NULL);
102 if (len <= sizeof(*sd))
105 sd->port = cpu_to_be16(s->port);
106 dns_add_answer(TYPE_SRV, mdns_buf, len);
109 #define TOUT_LOOKUP 60
112 service_timeout(struct service *s)
114 time_t t = time(NULL);
116 if (t - s->t <= TOUT_LOOKUP)
125 service_reply_a(struct interface *iface, int type)
131 dns_add_answer(TYPE_A, (uint8_t *) &iface->v4_addr.s_addr, 4);
132 dns_send_answer(iface, mdns_hostname_local);
136 service_reply(struct interface *iface, const char *match)
140 vlist_for_each_element(&services, s, node) {
141 const char *host = service_name(s->service);
142 char *service = strstr(host, "._");
144 if (!s->active || !service || !service_timeout(s))
149 if (match && strcmp(match, s->service))
153 service_add_ptr(service_name(s->service));
154 dns_send_answer(iface, service);
158 if (s->txt && s->txt_len)
159 dns_add_answer(TYPE_TXT, (uint8_t *) s->txt, s->txt_len);
160 dns_send_answer(iface, host);
166 service_reply_a(iface, TYPE_A);
170 service_announce_services(struct interface *iface, const char *service)
175 if (!strcmp(service, sdudp))
177 else if (strcmp(service, sdtcp))
180 vlist_for_each_element(&services, s, node) {
181 if (!strstr(s->service, "._tcp") && tcp)
183 if (!strstr(s->service, "._udp") && !tcp)
187 service_add_ptr(s->service);
189 dns_send_answer(iface, sdtcp);
191 dns_send_answer(iface, sdudp);
192 service_reply(iface, s->service);
197 service_announce(struct interface *iface)
199 service_announce_services(iface, sdudp);
200 service_announce_services(iface, sdtcp);
204 service_update(struct vlist_tree *tree, struct vlist_node *node_new,
205 struct vlist_node *node_old)
212 s = container_of(node_old, struct service, node);
217 service_load(char *path)
219 struct blob_attr *txt, *cur, *_tb[__SERVICE_MAX];
223 if (glob(path, GLOB_NOESCAPE | GLOB_MARK, NULL, &gl))
226 for (i = 0; i < gl.gl_pathc; i++) {
227 blob_buf_init(&b, 0);
229 if (!blobmsg_add_json_from_file(&b, gl.gl_pathv[i]))
231 blob_for_each_attr(cur, b.head, rem) {
233 char *d_service, *d_daemon;
238 blobmsg_parse(service_policy, ARRAY_SIZE(service_policy),
239 _tb, blobmsg_data(cur), blobmsg_data_len(cur));
240 if (!_tb[SERVICE_PORT] || !_tb[SERVICE_TXT])
243 blobmsg_for_each_attr(txt, _tb[SERVICE_TXT], rem2)
244 txt_len += 1 + strlen(blobmsg_get_string(txt));
246 s = calloc_a(sizeof(*s),
247 &d_daemon, strlen(gl.gl_pathv[i]) + 1,
248 &d_service, strlen(blobmsg_name(cur)) + 1,
253 s->port = blobmsg_get_u32(_tb[SERVICE_PORT]);
254 s->service = strcpy(d_service, blobmsg_name(cur));
255 s->daemon = strcpy(d_daemon, gl.gl_pathv[i]);
258 s->txt_len = txt_len;
261 blobmsg_for_each_attr(txt, _tb[SERVICE_TXT], rem2) {
262 int len = strlen(blobmsg_get_string(txt));
269 memcpy(d_txt, blobmsg_get_string(txt), len);
273 vlist_add(&services, &s->node, s->service);
283 vlist_update(&services);
284 service_load("/tmp/run/mdnsd/*");
285 vlist_flush(&services);
289 service_cleanup(void)
291 vlist_flush(&services);