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"
45 struct vlist_node node
;
58 static const struct blobmsg_policy service_policy
[__SERVICE_MAX
] = {
59 [SERVICE_INSTANCE
] = { .name
= "instance", .type
= BLOBMSG_TYPE_STRING
},
60 [SERVICE_SERVICE
] = { .name
= "service", .type
= BLOBMSG_TYPE_STRING
},
61 [SERVICE_PORT
] = { .name
= "port", .type
= BLOBMSG_TYPE_INT32
},
62 [SERVICE_TXT
] = { .name
= "txt", .type
= BLOBMSG_TYPE_ARRAY
},
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 static int service_init_announce
;
74 * service_instance_name - construct Service Instance Name as in RFC 6763
76 * RFC 6763 specifies Service Instance Names in the following way:
78 * Service Instance Name = <Instance> . <Service> . <Domain>
80 * @s: service to generate service instance name for
83 service_instance_name(struct service
*s
)
85 static char buffer
[256];
87 snprintf(buffer
, sizeof(buffer
), "%s.%s", s
->instance
, s
->service
);
93 service_add_ptr(const char *host
, int ttl
)
95 int len
= dn_comp(host
, mdns_buf
, sizeof(mdns_buf
), NULL
, NULL
);
100 dns_add_answer(TYPE_PTR
, mdns_buf
, len
, ttl
);
104 service_add_srv(struct service
*s
, int ttl
)
106 struct dns_srv_data
*sd
= (struct dns_srv_data
*) mdns_buf
;
107 int len
= sizeof(*sd
);
109 len
+= dn_comp(mdns_hostname_local
, mdns_buf
+ len
, sizeof(mdns_buf
) - len
, NULL
, NULL
);
110 if (len
<= sizeof(*sd
))
113 sd
->port
= cpu_to_be16(s
->port
);
114 dns_add_answer(TYPE_SRV
, mdns_buf
, len
, ttl
);
117 #define TOUT_LOOKUP 60
120 service_timeout(struct service
*s
)
122 time_t t
= monotonic_time();
124 if (t
- s
->t
<= TOUT_LOOKUP
) {
125 DBG(2, "t=%lu, s->t=%lu, t - s->t = %lu\n", t
, s
->t
, t
- s
->t
);
133 service_reply_single(struct interface
*iface
, struct sockaddr
*to
, struct service
*s
, int ttl
, int force
)
135 const char *host
= service_instance_name(s
);
136 char *service
= strstr(host
, "._");
137 time_t t
= service_timeout(s
);
140 if (!force
&& (!s
->active
|| !service
|| !t
))
148 service_add_ptr(service_instance_name(s
), ttl
);
149 dns_send_answer(iface
, to
, service
);
152 service_add_srv(s
, ttl
);
153 if (s
->txt
&& s
->txt_len
)
154 dns_add_answer(TYPE_TXT
, (uint8_t *) s
->txt
, s
->txt_len
, ttl
);
155 dns_send_answer(iface
, to
, host
);
159 service_reply(struct interface
*iface
, struct sockaddr
*to
, const char *instance
, const char *service_domain
, int ttl
)
163 vlist_for_each_element(&services
, s
, node
) {
164 if (instance
&& strcmp(s
->instance
, instance
))
166 if (service_domain
&& strcmp(s
->service
, service_domain
))
168 service_reply_single(iface
, to
, s
, ttl
, 0);
173 service_announce_services(struct interface
*iface
, struct sockaddr
*to
, int ttl
)
177 vlist_for_each_element(&services
, s
, node
) {
181 service_add_ptr(s
->service
, ttl
);
182 dns_send_answer(iface
, to
, C_DNS_SD
);
184 service_reply_single(iface
, to
, s
, ttl
, 0);
189 service_update(struct vlist_tree
*tree
, struct vlist_node
*node_new
,
190 struct vlist_node
*node_old
)
192 struct interface
*iface
;
196 s
= container_of(node_new
, struct service
, node
);
197 if (service_init_announce
)
198 vlist_for_each_element(&interfaces
, iface
, node
) {
200 service_reply_single(iface
, NULL
, s
, announce_ttl
, 1);
205 s
= container_of(node_old
, struct service
, node
);
206 if (!node_new
&& service_init_announce
)
207 vlist_for_each_element(&interfaces
, iface
, node
)
208 service_reply_single(iface
, NULL
, s
, 0, 1);
213 service_load_blob(struct blob_attr
*b
)
215 struct blob_attr
*txt
, *_tb
[__SERVICE_MAX
];
217 char *d_instance
, *d_service
, *d_id
;
223 blobmsg_parse(service_policy
, ARRAY_SIZE(service_policy
),
224 _tb
, blobmsg_data(b
), blobmsg_data_len(b
));
225 if (!_tb
[SERVICE_PORT
] || !_tb
[SERVICE_SERVICE
])
228 if (_tb
[SERVICE_TXT
])
229 blobmsg_for_each_attr(txt
, _tb
[SERVICE_TXT
], rem2
)
230 txt_len
+= 1 + strlen(blobmsg_get_string(txt
));
232 n
= strlen(blobmsg_name(b
)) + 1;
233 s
= calloc_a(sizeof(*s
),
235 &d_instance
, _tb
[SERVICE_INSTANCE
] ? strlen(blobmsg_get_string(_tb
[SERVICE_INSTANCE
])) + 1 : 0,
236 &d_service
, strlen(blobmsg_get_string(_tb
[SERVICE_SERVICE
])) + 1,
241 s
->port
= blobmsg_get_u32(_tb
[SERVICE_PORT
]);
242 s
->id
= strncpy(d_id
, blobmsg_name(b
), n
);
243 if (_tb
[SERVICE_INSTANCE
])
244 s
->instance
= strcpy(d_instance
, blobmsg_get_string(_tb
[SERVICE_INSTANCE
]));
246 s
->instance
= umdns_host_label
;
247 s
->service
= strcpy(d_service
, blobmsg_get_string(_tb
[SERVICE_SERVICE
]));
250 s
->txt_len
= txt_len
;
253 if (_tb
[SERVICE_TXT
])
254 blobmsg_for_each_attr(txt
, _tb
[SERVICE_TXT
], rem2
) {
255 int len
= strlen(blobmsg_get_string(txt
));
262 memcpy(d_txt
, blobmsg_get_string(txt
), len
);
266 vlist_add(&services
, &s
->node
, s
->id
);
270 service_load(char *path
)
272 struct blob_attr
*cur
;
276 if (glob(path
, GLOB_NOESCAPE
| GLOB_MARK
, NULL
, &gl
))
279 for (i
= 0; i
< gl
.gl_pathc
; i
++) {
280 blob_buf_init(&b
, 0);
281 if (blobmsg_add_json_from_file(&b
, gl
.gl_pathv
[i
])) {
282 blob_for_each_attr(cur
, b
.head
, rem
)
283 service_load_blob(cur
);
285 fprintf(stderr
, "Error reading %s JSON\n", gl
.gl_pathv
[i
]);
292 service_init_cb(struct ubus_request
*req
, int type
, struct blob_attr
*msg
)
294 struct blob_attr
*cur
;
299 vlist_update(&services
);
300 service_load("/etc/umdns/*");
302 blob_for_each_attr(cur
, msg
, rem
) {
303 struct blob_attr
*cur2
;
306 blobmsg_for_each_attr(cur2
, cur
, rem2
) {
307 struct blob_attr
*cur3
;
310 if (strcmp(blobmsg_name(cur2
), "instances"))
313 blobmsg_for_each_attr(cur3
, cur2
, rem3
) {
314 struct blob_attr
*cur4
;
318 blobmsg_for_each_attr(cur4
, cur3
, rem4
) {
319 const char *name
= blobmsg_name(cur4
);
321 if (!strcmp(name
, "running")) {
322 running
= blobmsg_get_bool(cur4
);
323 } else if (running
&& !strcmp(name
, "data")) {
324 struct blob_attr
*cur5
;
327 blobmsg_for_each_attr(cur5
, cur4
, rem5
) {
328 struct blob_attr
*cur6
;
331 if (strcmp(blobmsg_name(cur5
), "mdns"))
334 blobmsg_for_each_attr(cur6
, cur5
, rem6
)
335 service_load_blob(cur6
);
343 vlist_flush(&services
);
347 service_init(int announce
)
351 service_init_announce
= announce
;
352 ubus_service_list(service_init_cb
);
356 service_cleanup(void)
358 vlist_flush(&services
);