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 char *hostname = NULL;
72 static char *sdudp = "_services._dns-sd._udp.local";
73 static char *sdtcp = "_services._dns-sd._tcp.local";
76 service_name(const char *domain)
78 static char buffer[256];
80 snprintf(buffer, sizeof(buffer), "%s.%s", hostname, domain);
86 service_add_ptr(const char *host)
88 int len = dn_comp(host, mdns_buf, sizeof(mdns_buf), NULL, NULL);
93 dns_add_answer(TYPE_PTR, mdns_buf, len);
97 service_add_srv(struct service *s)
99 struct dns_srv_data *sd = (struct dns_srv_data *) mdns_buf;
100 char *host = service_name("local");
101 int len = sizeof(*sd);
103 len += dn_comp(host, 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);
109 service_name(s->service);
112 #define TOUT_LOOKUP 60
115 service_timeout(struct service *s)
117 time_t t = time(NULL);
119 if (t - s->t <= TOUT_LOOKUP)
128 service_reply_a(struct interface *iface, int type)
134 dns_add_answer(TYPE_A, (uint8_t *) &iface->v4_addr.s_addr, 4);
135 dns_send_answer(iface, service_name("local"));
139 service_reply(struct interface *iface, const char *match)
143 vlist_for_each_element(&services, s, node) {
144 char *host = service_name(s->service);
145 char *service = strstr(host, "._");
147 if (!s->active || !service || !service_timeout(s))
152 if (match && strcmp(match, s->service))
156 service_add_ptr(service_name(s->service));
157 dns_send_answer(iface, service);
161 if (s->txt && s->txt_len)
162 dns_add_answer(TYPE_TXT, (uint8_t *) s->txt, s->txt_len);
163 dns_send_answer(iface, host);
169 service_reply_a(iface, TYPE_A);
173 service_announce_services(struct interface *iface, const char *service)
178 if (!strcmp(service, sdudp))
180 else if (strcmp(service, sdtcp))
183 vlist_for_each_element(&services, s, node) {
184 if (!strstr(s->service, "._tcp") && tcp)
186 if (!strstr(s->service, "._udp") && !tcp)
190 service_add_ptr(s->service);
192 dns_send_answer(iface, sdtcp);
194 dns_send_answer(iface, sdudp);
195 service_reply(iface, s->service);
200 service_announce(struct interface *iface)
202 service_announce_services(iface, sdudp);
203 service_announce_services(iface, sdtcp);
207 service_update(struct vlist_tree *tree, struct vlist_node *node_new,
208 struct vlist_node *node_old)
215 s = container_of(node_old, struct service, node);
220 service_load(char *path)
222 struct blob_attr *txt, *cur, *_tb[__SERVICE_MAX];
226 if (glob(path, GLOB_NOESCAPE | GLOB_MARK, NULL, &gl))
229 for (i = 0; i < gl.gl_pathc; i++) {
230 blob_buf_init(&b, 0);
232 if (!blobmsg_add_json_from_file(&b, gl.gl_pathv[i]))
234 blob_for_each_attr(cur, b.head, rem) {
236 char *d_service, *d_daemon;
241 blobmsg_parse(service_policy, ARRAY_SIZE(service_policy),
242 _tb, blobmsg_data(cur), blobmsg_data_len(cur));
243 if (!_tb[SERVICE_PORT] || !_tb[SERVICE_TXT])
246 blobmsg_for_each_attr(txt, _tb[SERVICE_TXT], rem2)
247 txt_len += 1 + strlen(blobmsg_get_string(txt));
249 s = calloc_a(sizeof(*s),
250 &d_daemon, strlen(gl.gl_pathv[i]) + 1,
251 &d_service, strlen(blobmsg_name(cur)) + 1,
256 s->port = blobmsg_get_u32(_tb[SERVICE_PORT]);
257 s->service = strcpy(d_service, blobmsg_name(cur));
258 s->daemon = strcpy(d_daemon, gl.gl_pathv[i]);
261 s->txt_len = txt_len;
264 blobmsg_for_each_attr(txt, _tb[SERVICE_TXT], rem2) {
265 int len = strlen(blobmsg_get_string(txt));
272 memcpy(d_txt, blobmsg_get_string(txt), len);
276 vlist_add(&services, &s->node, s->service);
285 hostname = get_hostname();
287 vlist_update(&services);
288 service_load("/tmp/run/mdnsd/*");
289 vlist_flush(&services);
293 service_cleanup(void)
295 vlist_flush(&services);