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(struct service *s)
88 unsigned char buffer[MAX_NAME_LEN];
89 const char *host = service_name(s->service);
90 int len = dn_comp(host, buffer, MAX_NAME_LEN, NULL, NULL);
95 dns_add_answer(TYPE_PTR, buffer, len);
99 service_add_ptr_c(const char *host)
101 unsigned char buffer[MAX_NAME_LEN];
102 int len = dn_comp(host, buffer, MAX_NAME_LEN, NULL, NULL);
107 dns_add_answer(TYPE_PTR, buffer, len);
111 service_send_a(struct interface *iface)
113 unsigned char buffer[MAX_NAME_LEN];
114 char *host = service_name("local");
115 int len = dn_comp(host, buffer, MAX_NAME_LEN, NULL, NULL);
120 dns_add_answer(TYPE_A, (uint8_t *) &iface->v4_addr.s_addr, 4);
124 service_add_srv(struct service *s)
126 unsigned char buffer[MAX_NAME_LEN];
127 struct dns_srv_data *sd;
128 char *host = service_name("local");
129 int len = dn_comp(host, buffer, MAX_NAME_LEN, NULL, NULL);
134 sd = calloc(1, len + sizeof(struct dns_srv_data));
138 sd->port = cpu_to_be16(s->port);
139 memcpy(&sd[1], buffer, len);
140 host = service_name(s->service);
141 dns_add_answer(TYPE_SRV, (uint8_t *) sd, len + sizeof(struct dns_srv_data));
145 #define TOUT_LOOKUP 60
148 service_timeout(struct service *s)
150 time_t t = time(NULL);
152 if (t - s->t <= TOUT_LOOKUP)
161 service_reply_a(struct interface *iface, int type)
167 service_send_a(iface);
168 dns_send_answer(iface, service_name("local"));
172 service_reply(struct interface *iface, const char *match)
176 vlist_for_each_element(&services, s, node) {
177 char *host = service_name(s->service);
178 char *service = strstr(host, "._");
180 if (!s->active || !service || !service_timeout(s))
185 if (match && strcmp(match, s->service))
190 dns_send_answer(iface, service);
194 if (s->txt && s->txt_len)
195 dns_add_answer(TYPE_TXT, (uint8_t *) s->txt, s->txt_len);
196 dns_send_answer(iface, host);
203 service_send_a(iface);
204 dns_send_answer(iface, service_name("local"));
208 service_announce_services(struct interface *iface, const char *service)
213 if (!strcmp(service, sdudp))
215 else if (strcmp(service, sdtcp))
218 vlist_for_each_element(&services, s, node) {
219 if (!strstr(s->service, "._tcp") && tcp)
221 if (!strstr(s->service, "._udp") && !tcp)
225 service_add_ptr_c(s->service);
227 dns_send_answer(iface, sdtcp);
229 dns_send_answer(iface, sdudp);
230 service_reply(iface, s->service);
235 service_announce(struct interface *iface)
237 service_announce_services(iface, sdudp);
238 service_announce_services(iface, sdtcp);
242 service_update(struct vlist_tree *tree, struct vlist_node *node_new,
243 struct vlist_node *node_old)
250 s = container_of(node_old, struct service, node);
255 service_load(char *path)
257 struct blob_attr *txt, *cur, *_tb[__SERVICE_MAX];
261 if (glob(path, GLOB_NOESCAPE | GLOB_MARK, NULL, &gl))
264 for (i = 0; i < gl.gl_pathc; i++) {
265 blob_buf_init(&b, 0);
267 if (!blobmsg_add_json_from_file(&b, gl.gl_pathv[i]))
269 blob_for_each_attr(cur, b.head, rem) {
271 char *d_service, *d_daemon;
276 blobmsg_parse(service_policy, ARRAY_SIZE(service_policy),
277 _tb, blobmsg_data(cur), blobmsg_data_len(cur));
278 if (!_tb[SERVICE_PORT] || !_tb[SERVICE_TXT])
281 blobmsg_for_each_attr(txt, _tb[SERVICE_TXT], rem2)
282 txt_len += 1 + strlen(blobmsg_get_string(txt));
284 s = calloc_a(sizeof(*s),
285 &d_daemon, strlen(gl.gl_pathv[i]) + 1,
286 &d_service, strlen(blobmsg_name(cur)) + 1,
291 s->port = blobmsg_get_u32(_tb[SERVICE_PORT]);
292 s->service = strcpy(d_service, blobmsg_name(cur));
293 s->daemon = strcpy(d_daemon, gl.gl_pathv[i]);
296 s->txt_len = txt_len;
299 blobmsg_for_each_attr(txt, _tb[SERVICE_TXT], rem2) {
300 int len = strlen(blobmsg_get_string(txt));
307 memcpy(d_txt, blobmsg_get_string(txt), len);
311 vlist_add(&services, &s->node, s->service);
320 hostname = get_hostname();
322 vlist_update(&services);
323 service_load("/tmp/run/mdnsd/*");
324 vlist_flush(&services);
328 service_cleanup(void)
330 vlist_flush(&services);