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 static int service_init_announce
;
71 * service_instance_name - construct Service Instance Name as in RFC 6763
73 * RFC 6763 specifies Service Instance Names in the following way:
75 * Service Instance Name = <Instance> . <Service> . <Domain>
77 * @service_domain: service name (a pair of labels) with domain name appended
80 service_instance_name(const char *service_domain
)
82 static char buffer
[256];
84 snprintf(buffer
, sizeof(buffer
), "%s.%s", umdns_host_label
, service_domain
);
90 service_add_ptr(const char *host
, int ttl
)
92 int len
= dn_comp(host
, mdns_buf
, sizeof(mdns_buf
), NULL
, NULL
);
97 dns_add_answer(TYPE_PTR
, mdns_buf
, len
, ttl
);
101 service_add_srv(struct service
*s
, int ttl
)
103 struct dns_srv_data
*sd
= (struct dns_srv_data
*) mdns_buf
;
104 int len
= sizeof(*sd
);
106 len
+= dn_comp(mdns_hostname_local
, mdns_buf
+ len
, sizeof(mdns_buf
) - len
, NULL
, NULL
);
107 if (len
<= sizeof(*sd
))
110 sd
->port
= cpu_to_be16(s
->port
);
111 dns_add_answer(TYPE_SRV
, mdns_buf
, len
, ttl
);
114 #define TOUT_LOOKUP 60
117 service_timeout(struct service
*s
)
119 time_t t
= monotonic_time();
121 if (t
- s
->t
<= TOUT_LOOKUP
)
128 service_reply_single(struct interface
*iface
, struct sockaddr
*to
, struct service
*s
, int ttl
, int force
)
130 const char *host
= service_instance_name(s
->service
);
131 char *service
= strstr(host
, "._");
132 time_t t
= service_timeout(s
);
135 if (!force
&& (!s
->active
|| !service
|| !t
))
143 service_add_ptr(service_instance_name(s
->service
), ttl
);
144 dns_send_answer(iface
, to
, service
);
147 service_add_srv(s
, ttl
);
148 if (s
->txt
&& s
->txt_len
)
149 dns_add_answer(TYPE_TXT
, (uint8_t *) s
->txt
, s
->txt_len
, ttl
);
150 dns_send_answer(iface
, to
, host
);
154 service_reply(struct interface
*iface
, struct sockaddr
*to
, const char *match
, int ttl
)
158 vlist_for_each_element(&services
, s
, node
) {
159 if (!match
|| !strcmp(s
->service
, match
))
160 service_reply_single(iface
, to
, s
, ttl
, 0);
165 service_announce_services(struct interface
*iface
, struct sockaddr
*to
, int ttl
)
169 vlist_for_each_element(&services
, s
, node
) {
173 service_add_ptr(s
->service
, ttl
);
174 dns_send_answer(iface
, to
, C_DNS_SD
);
176 service_reply_single(iface
, to
, s
, ttl
, 0);
181 service_update(struct vlist_tree
*tree
, struct vlist_node
*node_new
,
182 struct vlist_node
*node_old
)
184 struct interface
*iface
;
188 s
= container_of(node_new
, struct service
, node
);
189 if (service_init_announce
)
190 vlist_for_each_element(&interfaces
, iface
, node
) {
192 service_reply_single(iface
, NULL
, s
, announce_ttl
, 1);
197 s
= container_of(node_old
, struct service
, node
);
198 if (!node_new
&& service_init_announce
)
199 vlist_for_each_element(&interfaces
, iface
, node
)
200 service_reply_single(iface
, NULL
, s
, 0, 1);
205 service_load_blob(struct blob_attr
*b
)
207 struct blob_attr
*txt
, *_tb
[__SERVICE_MAX
];
209 char *d_service
, *d_id
;
214 blobmsg_parse(service_policy
, ARRAY_SIZE(service_policy
),
215 _tb
, blobmsg_data(b
), blobmsg_data_len(b
));
216 if (!_tb
[SERVICE_PORT
] || !_tb
[SERVICE_SERVICE
])
219 if (_tb
[SERVICE_TXT
])
220 blobmsg_for_each_attr(txt
, _tb
[SERVICE_TXT
], rem2
)
221 txt_len
+= 1 + strlen(blobmsg_get_string(txt
));
223 s
= calloc_a(sizeof(*s
),
224 &d_id
, strlen(blobmsg_name(b
)) + 1,
225 &d_service
, strlen(blobmsg_get_string(_tb
[SERVICE_SERVICE
])) + 1,
230 s
->port
= blobmsg_get_u32(_tb
[SERVICE_PORT
]);
231 s
->id
= strcpy(d_id
, blobmsg_name(b
));
232 s
->service
= strcpy(d_service
, blobmsg_get_string(_tb
[SERVICE_SERVICE
]));
235 s
->txt_len
= txt_len
;
238 if (_tb
[SERVICE_TXT
])
239 blobmsg_for_each_attr(txt
, _tb
[SERVICE_TXT
], rem2
) {
240 int len
= strlen(blobmsg_get_string(txt
));
247 memcpy(d_txt
, blobmsg_get_string(txt
), len
);
251 vlist_add(&services
, &s
->node
, s
->id
);
255 service_load(char *path
)
257 struct blob_attr
*cur
;
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);
266 if (blobmsg_add_json_from_file(&b
, gl
.gl_pathv
[i
])) {
267 blob_for_each_attr(cur
, b
.head
, rem
)
268 service_load_blob(cur
);
270 fprintf(stderr
, "Error reading %s JSON\n", gl
.gl_pathv
[i
]);
277 service_init_cb(struct ubus_request
*req
, int type
, struct blob_attr
*msg
)
279 struct blob_attr
*cur
;
284 vlist_update(&services
);
285 service_load("/etc/umdns/*");
287 blob_for_each_attr(cur
, msg
, rem
) {
288 struct blob_attr
*cur2
;
291 blobmsg_for_each_attr(cur2
, cur
, rem2
) {
292 struct blob_attr
*cur3
;
295 if (strcmp(blobmsg_name(cur2
), "instances"))
298 blobmsg_for_each_attr(cur3
, cur2
, rem3
) {
299 struct blob_attr
*cur4
;
303 blobmsg_for_each_attr(cur4
, cur3
, rem4
) {
304 const char *name
= blobmsg_name(cur4
);
306 if (!strcmp(name
, "running")) {
307 running
= blobmsg_get_bool(cur4
);
308 } else if (running
&& !strcmp(name
, "data")) {
309 struct blob_attr
*cur5
;
312 blobmsg_for_each_attr(cur5
, cur4
, rem5
) {
313 struct blob_attr
*cur6
;
316 if (strcmp(blobmsg_name(cur5
), "mdns"))
319 blobmsg_for_each_attr(cur6
, cur5
, rem6
)
320 service_load_blob(cur6
);
328 vlist_flush(&services
);
332 service_init(int announce
)
336 service_init_announce
= announce
;
337 ubus_service_list(service_init_cb
);
341 service_cleanup(void)
343 vlist_flush(&services
);