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 static int service_init_announce
;
72 service_name(const char *domain
)
74 static char buffer
[256];
76 snprintf(buffer
, sizeof(buffer
), "%s.%s", mdns_hostname
, domain
);
82 service_add_ptr(const char *host
, int ttl
)
84 int len
= dn_comp(host
, mdns_buf
, sizeof(mdns_buf
), NULL
, NULL
);
89 dns_add_answer(TYPE_PTR
, mdns_buf
, len
, ttl
);
93 service_add_srv(struct service
*s
, int ttl
)
95 struct dns_srv_data
*sd
= (struct dns_srv_data
*) mdns_buf
;
96 int len
= sizeof(*sd
);
98 len
+= dn_comp(mdns_hostname_local
, mdns_buf
+ len
, sizeof(mdns_buf
) - len
, NULL
, NULL
);
99 if (len
<= sizeof(*sd
))
102 sd
->port
= cpu_to_be16(s
->port
);
103 dns_add_answer(TYPE_SRV
, mdns_buf
, len
, ttl
);
106 #define TOUT_LOOKUP 60
109 service_timeout(struct service
*s
)
111 time_t t
= monotonic_time();
113 if (t
- s
->t
<= TOUT_LOOKUP
)
120 service_reply_single(struct interface
*iface
, struct service
*s
, int ttl
, int force
)
122 const char *host
= service_name(s
->service
);
123 char *service
= strstr(host
, "._");
124 time_t t
= service_timeout(s
);
127 if (!force
&& (!s
->active
|| !service
|| !t
))
135 service_add_ptr(service_name(s
->service
), ttl
);
136 dns_send_answer(iface
, service
);
139 service_add_srv(s
, ttl
);
140 if (s
->txt
&& s
->txt_len
)
141 dns_add_answer(TYPE_TXT
, (uint8_t *) s
->txt
, s
->txt_len
, ttl
);
142 dns_send_answer(iface
, host
);
146 service_reply(struct interface
*iface
, const char *match
, int ttl
)
150 vlist_for_each_element(&services
, s
, node
) {
151 if (!match
|| !strcmp(s
->service
, match
))
152 service_reply_single(iface
, s
, ttl
, 0);
157 service_announce_services(struct interface
*iface
, int ttl
)
161 vlist_for_each_element(&services
, s
, node
) {
165 service_add_ptr(s
->service
, ttl
);
166 dns_send_answer(iface
, sdudp
);
168 service_reply_single(iface
, s
, ttl
, 0);
173 service_announce(struct interface
*iface
, int ttl
)
175 service_announce_services(iface
, ttl
);
179 service_update(struct vlist_tree
*tree
, struct vlist_node
*node_new
,
180 struct vlist_node
*node_old
)
182 struct interface
*iface
;
186 s
= container_of(node_new
, struct service
, node
);
187 if (service_init_announce
)
188 vlist_for_each_element(&interfaces
, iface
, node
) {
190 service_reply_single(iface
, s
, announce_ttl
, 1);
195 s
= container_of(node_old
, struct service
, node
);
196 if (!node_new
&& service_init_announce
)
197 vlist_for_each_element(&interfaces
, iface
, node
)
198 service_reply_single(iface
, s
, 0, 1);
203 service_load_blob(struct blob_attr
*b
)
205 struct blob_attr
*txt
, *_tb
[__SERVICE_MAX
];
207 char *d_service
, *d_id
;
212 blobmsg_parse(service_policy
, ARRAY_SIZE(service_policy
),
213 _tb
, blobmsg_data(b
), blobmsg_data_len(b
));
214 if (!_tb
[SERVICE_PORT
] || !_tb
[SERVICE_SERVICE
])
217 if (_tb
[SERVICE_TXT
])
218 blobmsg_for_each_attr(txt
, _tb
[SERVICE_TXT
], rem2
)
219 txt_len
+= 1 + strlen(blobmsg_get_string(txt
));
221 s
= calloc_a(sizeof(*s
),
222 &d_id
, strlen(blobmsg_name(b
)) + 1,
223 &d_service
, strlen(blobmsg_get_string(_tb
[SERVICE_SERVICE
])) + 1,
228 s
->port
= blobmsg_get_u32(_tb
[SERVICE_PORT
]);
229 s
->id
= strcpy(d_id
, blobmsg_name(b
));
230 s
->service
= strcpy(d_service
, blobmsg_get_string(_tb
[SERVICE_SERVICE
]));
233 s
->txt_len
= txt_len
;
236 if (_tb
[SERVICE_TXT
])
237 blobmsg_for_each_attr(txt
, _tb
[SERVICE_TXT
], rem2
) {
238 int len
= strlen(blobmsg_get_string(txt
));
245 memcpy(d_txt
, blobmsg_get_string(txt
), len
);
249 vlist_add(&services
, &s
->node
, s
->id
);
253 service_load(char *path
)
255 struct blob_attr
*cur
;
259 if (glob(path
, GLOB_NOESCAPE
| GLOB_MARK
, NULL
, &gl
))
262 for (i
= 0; i
< gl
.gl_pathc
; i
++) {
263 blob_buf_init(&b
, 0);
264 if (blobmsg_add_json_from_file(&b
, gl
.gl_pathv
[i
]))
265 blob_for_each_attr(cur
, b
.head
, rem
)
266 service_load_blob(cur
);
272 service_init_cb(struct ubus_request
*req
, int type
, struct blob_attr
*msg
)
274 struct blob_attr
*cur
;
279 vlist_update(&services
);
280 service_load("/tmp/run/mdns/*");
282 blob_for_each_attr(cur
, msg
, rem
) {
283 struct blob_attr
*cur2
;
286 blobmsg_for_each_attr(cur2
, cur
, rem2
) {
287 struct blob_attr
*cur3
;
290 if (strcmp(blobmsg_name(cur2
), "instances"))
293 blobmsg_for_each_attr(cur3
, cur2
, rem3
) {
294 struct blob_attr
*cur4
;
298 blobmsg_for_each_attr(cur4
, cur3
, rem4
) {
299 const char *name
= blobmsg_name(cur4
);
301 if (!strcmp(name
, "running")) {
302 running
= blobmsg_get_bool(cur4
);
303 } else if (running
&& !strcmp(name
, "data")) {
304 struct blob_attr
*cur5
;
307 blobmsg_for_each_attr(cur5
, cur4
, rem5
) {
308 struct blob_attr
*cur6
;
311 if (strcmp(blobmsg_name(cur5
), "mdns"))
314 blobmsg_for_each_attr(cur6
, cur5
, rem6
)
315 service_load_blob(cur6
);
323 vlist_flush(&services
);
327 service_init(int announce
)
331 service_init_announce
= announce
;
332 ubus_service_list(service_init_cb
);
336 service_cleanup(void)
338 vlist_flush(&services
);