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 <netinet/in.h>
16 #include <arpa/nameser.h>
17 #include <sys/socket.h>
18 #include <netinet/in.h>
19 #include <arpa/inet.h>
29 #include <libubox/vlist.h>
30 #include <libubox/uloop.h>
31 #include <libubox/avl-cmp.h>
32 #include <libubox/blobmsg_json.h>
37 #include "interface.h"
46 struct vlist_node node;
58 static const struct blobmsg_policy service_policy[__SERVICE_MAX] = {
59 [SERVICE_PORT] = { .name = "port", .type = BLOBMSG_TYPE_INT32 },
60 [SERVICE_TXT] = { .name = "txt", .type = BLOBMSG_TYPE_ARRAY },
63 static const struct uci_blob_param_list service_attr_list = {
64 .n_params = __SERVICE_MAX,
65 .params = service_policy,
69 service_update(struct vlist_tree *tree, struct vlist_node *node_new,
70 struct vlist_node *node_old);
72 static struct blob_buf b;
73 static VLIST_TREE(services, avl_strcmp, service_update, false, false);
74 char *hostname = NULL;
75 static char *sdudp = "_services._dns-sd._udp.local";
76 static char *sdtcp = "_services._dns-sd._tcp.local";
79 service_name(const char *domain)
81 static char buffer[256];
83 snprintf(buffer, sizeof(buffer), "%s.%s", hostname, domain);
89 service_add_ptr(struct service *s)
91 unsigned char buffer[MAX_NAME_LEN];
92 const char *host = service_name(s->service);
93 int len = dn_comp(host, buffer, MAX_NAME_LEN, NULL, NULL);
98 dns_add_answer(TYPE_PTR, buffer, len);
102 service_add_ptr_c(const char *host)
104 unsigned char buffer[MAX_NAME_LEN];
105 int len = dn_comp(host, buffer, MAX_NAME_LEN, NULL, NULL);
110 dns_add_answer(TYPE_PTR, buffer, len);
114 service_send_a(struct interface *iface)
116 unsigned char buffer[MAX_NAME_LEN];
117 char *host = service_name("local");
118 int len = dn_comp(host, buffer, MAX_NAME_LEN, NULL, NULL);
121 if (!inet_aton(iface->ip, &in)) {
122 fprintf(stderr, "%s is not valid\n", iface->ip);
129 dns_add_answer(TYPE_A, (uint8_t *) &in.s_addr, 4);
133 service_add_srv(struct service *s)
135 unsigned char buffer[MAX_NAME_LEN];
136 struct dns_srv_data *sd;
137 char *host = service_name("local");
138 int len = dn_comp(host, buffer, MAX_NAME_LEN, NULL, NULL);
143 sd = calloc(1, len + sizeof(struct dns_srv_data));
147 sd->port = cpu_to_be16(s->port);
148 memcpy(&sd[1], buffer, len);
149 host = service_name(s->service);
150 dns_add_answer(TYPE_SRV, (uint8_t *) sd, len + sizeof(struct dns_srv_data));
154 #define TOUT_LOOKUP 60
157 service_timeout(struct service *s)
159 time_t t = time(NULL);
161 if (t - s->t <= TOUT_LOOKUP)
170 service_reply_a(struct interface *iface, int type)
176 service_send_a(iface);
177 dns_send_answer(iface, service_name("local"));
181 service_reply(struct interface *iface, const char *match)
185 vlist_for_each_element(&services, s, node) {
186 char *host = service_name(s->service);
187 char *service = strstr(host, "._");
189 if (!s->active || !service || !service_timeout(s))
194 if (match && strcmp(match, s->service))
199 dns_send_answer(iface, service);
203 if (s->txt && s->txt_len)
204 dns_add_answer(TYPE_TXT, (uint8_t *) s->txt, s->txt_len);
205 dns_send_answer(iface, host);
212 service_send_a(iface);
213 dns_send_answer(iface, service_name("local"));
217 service_announce_services(struct interface *iface, const char *service)
222 if (!strcmp(service, sdudp))
224 else if (strcmp(service, sdtcp))
227 vlist_for_each_element(&services, s, node) {
228 if (!strstr(s->service, "._tcp") && tcp)
230 if (!strstr(s->service, "._udp") && !tcp)
234 service_add_ptr_c(s->service);
236 dns_send_answer(iface, sdtcp);
238 dns_send_answer(iface, sdudp);
239 service_reply(iface, s->service);
244 service_announce(struct interface *iface)
246 service_announce_services(iface, sdudp);
247 service_announce_services(iface, sdtcp);
251 service_update(struct vlist_tree *tree, struct vlist_node *node_new,
252 struct vlist_node *node_old)
259 s = container_of(node_old, struct service, node);
264 service_load(char *path)
266 struct blob_attr *txt, *cur, *_tb[__SERVICE_MAX];
270 if (glob(path, GLOB_NOESCAPE | GLOB_MARK, NULL, &gl))
273 for (i = 0; i < gl.gl_pathc; i++) {
274 blob_buf_init(&b, 0);
276 if (!blobmsg_add_json_from_file(&b, gl.gl_pathv[i]))
278 blob_for_each_attr(cur, b.head, rem) {
280 char *d_service, *d_daemon;
285 blobmsg_parse(service_policy, ARRAY_SIZE(service_policy),
286 _tb, blobmsg_data(cur), blobmsg_data_len(cur));
287 if (!_tb[SERVICE_PORT] || !_tb[SERVICE_TXT])
290 blobmsg_for_each_attr(txt, _tb[SERVICE_TXT], rem2)
291 txt_len += 1 + strlen(blobmsg_get_string(txt));
293 s = calloc_a(sizeof(*s),
294 &d_daemon, strlen(gl.gl_pathv[i]) + 1,
295 &d_service, strlen(blobmsg_name(cur)) + 1,
300 s->port = blobmsg_get_u32(_tb[SERVICE_PORT]);
301 s->service = strcpy(d_service, blobmsg_name(cur));
302 s->daemon = strcpy(d_daemon, gl.gl_pathv[i]);
305 s->txt_len = txt_len;
308 blobmsg_for_each_attr(txt, _tb[SERVICE_TXT], rem2) {
309 int len = strlen(blobmsg_get_string(txt));
316 memcpy(d_txt, blobmsg_get_string(txt), len);
320 vlist_add(&services, &s->node, s->service);
329 hostname = get_hostname();
331 vlist_update(&services);
332 service_load("/tmp/run/mdnsd/*");
333 vlist_flush(&services);
337 service_cleanup(void)
339 vlist_flush(&services);