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>
24 #include <libubox/vlist.h>
25 #include <libubox/uloop.h>
26 #include <libubox/avl-cmp.h>
27 #include <libubox/blobmsg_json.h>
33 #include "interface.h"
44 struct vlist_node node
;
56 static const struct blobmsg_policy service_policy
[__SERVICE_MAX
] = {
57 [SERVICE_SERVICE
] = { .name
= "service", .type
= BLOBMSG_TYPE_STRING
},
58 [SERVICE_PORT
] = { .name
= "port", .type
= BLOBMSG_TYPE_INT32
},
59 [SERVICE_TXT
] = { .name
= "txt", .type
= BLOBMSG_TYPE_ARRAY
},
63 service_update(struct vlist_tree
*tree
, struct vlist_node
*node_new
,
64 struct vlist_node
*node_old
);
66 static struct blob_buf b
;
67 static VLIST_TREE(services
, avl_strcmp
, service_update
, false, false);
68 char *sdudp
= "_services._dns-sd._udp.local";
69 char *sdtcp
= "_services._dns-sd._tcp.local";
70 static int service_init_announce
;
73 service_name(const char *domain
)
75 static char buffer
[256];
77 snprintf(buffer
, sizeof(buffer
), "%s.%s", mdns_hostname
, domain
);
83 service_add_ptr(const char *host
, int ttl
)
85 int len
= dn_comp(host
, mdns_buf
, sizeof(mdns_buf
), NULL
, NULL
);
90 dns_add_answer(TYPE_PTR
, mdns_buf
, len
, ttl
);
94 service_add_srv(struct service
*s
, int ttl
)
96 struct dns_srv_data
*sd
= (struct dns_srv_data
*) mdns_buf
;
97 int len
= sizeof(*sd
);
99 len
+= dn_comp(mdns_hostname_local
, mdns_buf
+ len
, sizeof(mdns_buf
) - len
, NULL
, NULL
);
100 if (len
<= sizeof(*sd
))
103 sd
->port
= cpu_to_be16(s
->port
);
104 dns_add_answer(TYPE_SRV
, mdns_buf
, len
, ttl
);
107 #define TOUT_LOOKUP 60
110 service_timeout(struct service
*s
)
112 time_t t
= monotonic_time();
114 if (t
- s
->t
<= TOUT_LOOKUP
)
121 service_reply_single(struct interface
*iface
, struct service
*s
, int ttl
, int force
)
123 const char *host
= service_name(s
->service
);
124 char *service
= strstr(host
, "._");
125 time_t t
= service_timeout(s
);
128 if (!force
&& (!s
->active
|| !service
|| !t
))
136 service_add_ptr(service_name(s
->service
), ttl
);
137 dns_send_answer(iface
, service
);
140 service_add_srv(s
, ttl
);
141 if (s
->txt
&& s
->txt_len
)
142 dns_add_answer(TYPE_TXT
, (uint8_t *) s
->txt
, s
->txt_len
, ttl
);
143 dns_send_answer(iface
, host
);
147 service_reply(struct interface
*iface
, const char *match
, int ttl
)
151 vlist_for_each_element(&services
, s
, node
) {
152 if (!match
|| !strcmp(s
->service
, match
))
153 service_reply_single(iface
, s
, ttl
, 0);
158 service_announce_services(struct interface
*iface
, int tcp
, int ttl
)
162 vlist_for_each_element(&services
, s
, node
) {
163 if (!strstr(s
->service
, "._tcp") && tcp
)
165 if (!strstr(s
->service
, "._udp") && !tcp
)
170 service_add_ptr(s
->service
, ttl
);
172 dns_send_answer(iface
, sdtcp
);
174 dns_send_answer(iface
, sdudp
);
176 service_reply_single(iface
, s
, ttl
, 0);
181 service_announce(struct interface
*iface
, int ttl
)
183 service_announce_services(iface
, 0, ttl
);
184 service_announce_services(iface
, 1, ttl
);
188 service_update(struct vlist_tree
*tree
, struct vlist_node
*node_new
,
189 struct vlist_node
*node_old
)
191 struct interface
*iface
;
195 s
= container_of(node_new
, struct service
, node
);
196 if (service_init_announce
)
197 vlist_for_each_element(&interfaces
, iface
, node
) {
199 service_reply_single(iface
, s
, announce_ttl
, 1);
204 s
= container_of(node_old
, struct service
, node
);
205 if (!node_new
&& service_init_announce
)
206 vlist_for_each_element(&interfaces
, iface
, node
)
207 service_reply_single(iface
, s
, 0, 1);
212 service_load_blob(struct blob_attr
*b
)
214 struct blob_attr
*txt
, *_tb
[__SERVICE_MAX
];
216 char *d_service
, *d_id
;
221 blobmsg_parse(service_policy
, ARRAY_SIZE(service_policy
),
222 _tb
, blobmsg_data(b
), blobmsg_data_len(b
));
223 if (!_tb
[SERVICE_PORT
] || !_tb
[SERVICE_SERVICE
])
226 if (_tb
[SERVICE_TXT
])
227 blobmsg_for_each_attr(txt
, _tb
[SERVICE_TXT
], rem2
)
228 txt_len
+= 1 + strlen(blobmsg_get_string(txt
));
230 s
= calloc_a(sizeof(*s
),
231 &d_id
, strlen(blobmsg_name(b
)) + 1,
232 &d_service
, strlen(blobmsg_get_string(_tb
[SERVICE_SERVICE
])) + 1,
237 s
->port
= blobmsg_get_u32(_tb
[SERVICE_PORT
]);
238 s
->id
= strcpy(d_id
, blobmsg_name(b
));
239 s
->service
= strcpy(d_service
, blobmsg_get_string(_tb
[SERVICE_SERVICE
]));
242 s
->txt_len
= txt_len
;
245 if (_tb
[SERVICE_TXT
])
246 blobmsg_for_each_attr(txt
, _tb
[SERVICE_TXT
], rem2
) {
247 int len
= strlen(blobmsg_get_string(txt
));
254 memcpy(d_txt
, blobmsg_get_string(txt
), len
);
258 vlist_add(&services
, &s
->node
, s
->id
);
262 service_load(char *path
)
264 struct blob_attr
*cur
;
268 if (glob(path
, GLOB_NOESCAPE
| GLOB_MARK
, NULL
, &gl
))
271 for (i
= 0; i
< gl
.gl_pathc
; i
++) {
272 blob_buf_init(&b
, 0);
273 if (blobmsg_add_json_from_file(&b
, gl
.gl_pathv
[i
]))
274 blob_for_each_attr(cur
, b
.head
, rem
)
275 service_load_blob(cur
);
281 service_init_cb(struct ubus_request
*req
, int type
, struct blob_attr
*msg
)
283 struct blob_attr
*cur
;
288 vlist_update(&services
);
289 service_load("/tmp/run/mdns/*");
291 blob_for_each_attr(cur
, msg
, rem
) {
292 struct blob_attr
*cur2
;
295 blobmsg_for_each_attr(cur2
, cur
, rem2
) {
296 struct blob_attr
*cur3
;
299 if (strcmp(blobmsg_name(cur2
), "instances"))
302 blobmsg_for_each_attr(cur3
, cur2
, rem3
) {
303 struct blob_attr
*cur4
;
307 blobmsg_for_each_attr(cur4
, cur3
, rem4
) {
308 const char *name
= blobmsg_name(cur4
);
310 if (!strcmp(name
, "running")) {
311 running
= blobmsg_get_bool(cur4
);
312 } else if (running
&& !strcmp(name
, "data")) {
313 struct blob_attr
*cur5
;
316 blobmsg_for_each_attr(cur5
, cur4
, rem5
) {
317 struct blob_attr
*cur6
;
320 if (strcmp(blobmsg_name(cur5
), "mdns"))
323 blobmsg_for_each_attr(cur6
, cur5
, rem6
)
324 service_load_blob(cur6
);
332 vlist_flush(&services
);
336 service_init(int announce
)
340 service_init_announce
= announce
;
341 ubus_service_list(service_init_cb
);
345 service_cleanup(void)
347 vlist_flush(&services
);