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 },
61 service_update(struct vlist_tree *tree, struct vlist_node *node_new,
62 struct vlist_node *node_old);
64 static struct blob_buf b;
65 static VLIST_TREE(services, avl_strcmp, service_update, false, false);
66 static char *sdudp = "_services._dns-sd._udp.local";
67 static char *sdtcp = "_services._dns-sd._tcp.local";
70 service_name(const char *domain)
72 static char buffer[256];
74 snprintf(buffer, sizeof(buffer), "%s.%s", mdns_hostname, domain);
80 service_add_ptr(const char *host)
82 int len = dn_comp(host, mdns_buf, sizeof(mdns_buf), NULL, NULL);
87 dns_add_answer(TYPE_PTR, mdns_buf, len);
91 service_add_srv(struct service *s)
93 struct dns_srv_data *sd = (struct dns_srv_data *) mdns_buf;
94 int len = sizeof(*sd);
96 len += dn_comp(mdns_hostname_local, mdns_buf + len, sizeof(mdns_buf) - len, NULL, NULL);
97 if (len <= sizeof(*sd))
100 sd->port = cpu_to_be16(s->port);
101 dns_add_answer(TYPE_SRV, mdns_buf, len);
104 #define TOUT_LOOKUP 60
107 service_timeout(struct service *s)
109 time_t t = time(NULL);
111 if (t - s->t <= TOUT_LOOKUP)
120 service_reply_a(struct interface *iface, int type)
126 dns_add_answer(TYPE_A, (uint8_t *) &iface->v4_addr.s_addr, 4);
127 dns_send_answer(iface, mdns_hostname_local);
131 service_reply(struct interface *iface, const char *match)
135 vlist_for_each_element(&services, s, node) {
136 const char *host = service_name(s->service);
137 char *service = strstr(host, "._");
139 if (!s->active || !service || !service_timeout(s))
144 if (match && strcmp(match, s->service))
148 service_add_ptr(service_name(s->service));
149 dns_send_answer(iface, service);
153 if (s->txt && s->txt_len)
154 dns_add_answer(TYPE_TXT, (uint8_t *) s->txt, s->txt_len);
155 dns_send_answer(iface, host);
161 service_reply_a(iface, TYPE_A);
165 service_announce_services(struct interface *iface, const char *service)
170 if (!strcmp(service, sdudp))
172 else if (strcmp(service, sdtcp))
175 vlist_for_each_element(&services, s, node) {
176 if (!strstr(s->service, "._tcp") && tcp)
178 if (!strstr(s->service, "._udp") && !tcp)
182 service_add_ptr(s->service);
184 dns_send_answer(iface, sdtcp);
186 dns_send_answer(iface, sdudp);
187 service_reply(iface, s->service);
192 service_announce(struct interface *iface)
194 service_announce_services(iface, sdudp);
195 service_announce_services(iface, sdtcp);
199 service_update(struct vlist_tree *tree, struct vlist_node *node_new,
200 struct vlist_node *node_old)
207 s = container_of(node_old, struct service, node);
212 service_load(char *path)
214 struct blob_attr *txt, *cur, *_tb[__SERVICE_MAX];
218 if (glob(path, GLOB_NOESCAPE | GLOB_MARK, NULL, &gl))
221 for (i = 0; i < gl.gl_pathc; i++) {
222 blob_buf_init(&b, 0);
224 if (!blobmsg_add_json_from_file(&b, gl.gl_pathv[i]))
226 blob_for_each_attr(cur, b.head, rem) {
228 char *d_service, *d_daemon;
233 blobmsg_parse(service_policy, ARRAY_SIZE(service_policy),
234 _tb, blobmsg_data(cur), blobmsg_data_len(cur));
235 if (!_tb[SERVICE_PORT] || !_tb[SERVICE_TXT])
238 blobmsg_for_each_attr(txt, _tb[SERVICE_TXT], rem2)
239 txt_len += 1 + strlen(blobmsg_get_string(txt));
241 s = calloc_a(sizeof(*s),
242 &d_daemon, strlen(gl.gl_pathv[i]) + 1,
243 &d_service, strlen(blobmsg_name(cur)) + 1,
248 s->port = blobmsg_get_u32(_tb[SERVICE_PORT]);
249 s->service = strcpy(d_service, blobmsg_name(cur));
250 s->daemon = strcpy(d_daemon, gl.gl_pathv[i]);
253 s->txt_len = txt_len;
256 blobmsg_for_each_attr(txt, _tb[SERVICE_TXT], rem2) {
257 int len = strlen(blobmsg_get_string(txt));
264 memcpy(d_txt, blobmsg_get_string(txt), len);
268 vlist_add(&services, &s->node, s->service);
278 vlist_update(&services);
279 service_load("/tmp/run/mdnsd/*");
280 vlist_flush(&services);
284 service_cleanup(void)
286 vlist_flush(&services);