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 char *sdudp
= "_services._dns-sd._udp.local";
69 static 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
, const char *match
, 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
))
133 if (match
&& strcmp(match
, s
->service
))
139 service_add_ptr(service_name(s
->service
), ttl
);
140 dns_send_answer(iface
, service
);
143 service_add_srv(s
, ttl
);
144 if (s
->txt
&& s
->txt_len
)
145 dns_add_answer(TYPE_TXT
, (uint8_t *) s
->txt
, s
->txt_len
, ttl
);
146 dns_send_answer(iface
, host
);
150 service_reply(struct interface
*iface
, const char *match
, int ttl
)
154 vlist_for_each_element(&services
, s
, node
)
155 service_reply_single(iface
, s
, match
, ttl
, 0);
161 dns_reply_a(iface
, ttl
);
165 service_announce_services(struct interface
*iface
, const char *service
, int ttl
)
170 if (!strcmp(service
, sdudp
))
172 else if (strcmp(service
, sdtcp
))
175 vlist_for_each_element(&services
, s
, node
) {
176 if (!strstr(s
->service
, "._tcp") && tcp
)
178 if (!strstr(s
->service
, "._udp") && !tcp
)
183 service_add_ptr(s
->service
, ttl
);
185 dns_send_answer(iface
, sdtcp
);
187 dns_send_answer(iface
, sdudp
);
189 service_reply(iface
, s
->service
, ttl
);
194 service_announce(struct interface
*iface
, int ttl
)
196 service_announce_services(iface
, sdudp
, ttl
);
197 service_announce_services(iface
, sdtcp
, ttl
);
201 service_update(struct vlist_tree
*tree
, struct vlist_node
*node_new
,
202 struct vlist_node
*node_old
)
204 struct interface
*iface
;
208 s
= container_of(node_new
, struct service
, node
);
209 if (service_init_announce
)
210 vlist_for_each_element(&interfaces
, iface
, node
) {
212 service_reply_single(iface
, s
, NULL
, announce_ttl
, 1);
217 s
= container_of(node_old
, struct service
, node
);
218 if (!node_new
&& service_init_announce
)
219 vlist_for_each_element(&interfaces
, iface
, node
)
220 service_reply_single(iface
, s
, NULL
, 0, 1);
225 service_load_blob(struct blob_attr
*b
)
227 struct blob_attr
*txt
, *_tb
[__SERVICE_MAX
];
229 char *d_service
, *d_id
;
234 blobmsg_parse(service_policy
, ARRAY_SIZE(service_policy
),
235 _tb
, blobmsg_data(b
), blobmsg_data_len(b
));
236 if (!_tb
[SERVICE_PORT
] || !_tb
[SERVICE_SERVICE
])
239 if (_tb
[SERVICE_SERVICE
])
240 blobmsg_for_each_attr(txt
, _tb
[SERVICE_TXT
], rem2
)
241 txt_len
+= 1 + strlen(blobmsg_get_string(txt
));
243 s
= calloc_a(sizeof(*s
),
244 &d_id
, strlen(blobmsg_name(b
)) + 1,
245 &d_service
, strlen(blobmsg_get_string(_tb
[SERVICE_SERVICE
])) + 1,
250 s
->port
= blobmsg_get_u32(_tb
[SERVICE_PORT
]);
251 s
->id
= strcpy(d_id
, blobmsg_name(b
));
252 s
->service
= strcpy(d_service
, blobmsg_get_string(_tb
[SERVICE_SERVICE
]));
255 s
->txt_len
= txt_len
;
258 if (_tb
[SERVICE_SERVICE
])
259 blobmsg_for_each_attr(txt
, _tb
[SERVICE_TXT
], rem2
) {
260 int len
= strlen(blobmsg_get_string(txt
));
267 memcpy(d_txt
, blobmsg_get_string(txt
), len
);
271 vlist_add(&services
, &s
->node
, s
->id
);
275 service_load(char *path
)
277 struct blob_attr
*cur
;
281 if (glob(path
, GLOB_NOESCAPE
| GLOB_MARK
, NULL
, &gl
))
284 for (i
= 0; i
< gl
.gl_pathc
; i
++) {
285 blob_buf_init(&b
, 0);
286 if (blobmsg_add_json_from_file(&b
, gl
.gl_pathv
[i
]))
287 blob_for_each_attr(cur
, b
.head
, rem
)
288 service_load_blob(cur
);
294 service_init_cb(struct ubus_request
*req
, int type
, struct blob_attr
*msg
)
296 struct blob_attr
*cur
;
301 vlist_update(&services
);
302 service_load("/tmp/run/mdns/*");
304 blob_for_each_attr(cur
, msg
, rem
) {
305 struct blob_attr
*cur2
;
308 blobmsg_for_each_attr(cur2
, cur
, rem2
) {
309 struct blob_attr
*cur3
;
312 if (strcmp(blobmsg_name(cur2
), "instances"))
315 blobmsg_for_each_attr(cur3
, cur2
, rem3
) {
316 struct blob_attr
*cur4
;
320 blobmsg_for_each_attr(cur4
, cur3
, rem4
) {
321 const char *name
= blobmsg_name(cur4
);
323 if (!strcmp(name
, "running")) {
324 running
= blobmsg_get_bool(cur4
);
325 } else if (running
&& !strcmp(name
, "data")) {
326 struct blob_attr
*cur5
;
329 blobmsg_for_each_attr(cur5
, cur4
, rem5
) {
330 struct blob_attr
*cur6
;
333 if (strcmp(blobmsg_name(cur5
), "mdns"))
336 blobmsg_for_each_attr(cur6
, cur5
, rem6
)
337 service_load_blob(cur6
);
345 vlist_flush(&services
);
349 service_init(int announce
)
353 service_init_announce
= announce
;
354 ubus_service_list(service_init_cb
);
358 service_cleanup(void)
360 vlist_flush(&services
);