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
;
57 static const struct blobmsg_policy service_policy
[__SERVICE_MAX
] = {
58 [SERVICE_SERVICE
] = { .name
= "service", .type
= BLOBMSG_TYPE_STRING
},
59 [SERVICE_PORT
] = { .name
= "port", .type
= BLOBMSG_TYPE_INT32
},
60 [SERVICE_TXT
] = { .name
= "txt", .type
= BLOBMSG_TYPE_ARRAY
},
64 service_update(struct vlist_tree
*tree
, struct vlist_node
*node_new
,
65 struct vlist_node
*node_old
);
67 static struct blob_buf b
;
68 static VLIST_TREE(services
, avl_strcmp
, service_update
, false, false);
69 static int service_init_announce
;
72 * service_instance_name - construct Service Instance Name as in RFC 6763
74 * RFC 6763 specifies Service Instance Names in the following way:
76 * Service Instance Name = <Instance> . <Service> . <Domain>
78 * @s: service to generate service instance name for
81 service_instance_name(struct service
*s
)
83 static char buffer
[256];
85 snprintf(buffer
, sizeof(buffer
), "%s.%s", s
->instance
, s
->service
);
91 service_add_ptr(const char *host
, int ttl
)
93 int len
= dn_comp(host
, mdns_buf
, sizeof(mdns_buf
), NULL
, NULL
);
98 dns_add_answer(TYPE_PTR
, mdns_buf
, len
, ttl
);
102 service_add_srv(struct service
*s
, int ttl
)
104 struct dns_srv_data
*sd
= (struct dns_srv_data
*) mdns_buf
;
105 int len
= sizeof(*sd
);
107 len
+= dn_comp(mdns_hostname_local
, mdns_buf
+ len
, sizeof(mdns_buf
) - len
, NULL
, NULL
);
108 if (len
<= sizeof(*sd
))
111 sd
->port
= cpu_to_be16(s
->port
);
112 dns_add_answer(TYPE_SRV
, mdns_buf
, len
, ttl
);
115 #define TOUT_LOOKUP 60
118 service_timeout(struct service
*s
)
120 time_t t
= monotonic_time();
122 if (t
- s
->t
<= TOUT_LOOKUP
)
129 service_reply_single(struct interface
*iface
, struct sockaddr
*to
, struct service
*s
, int ttl
, int force
)
131 const char *host
= service_instance_name(s
);
132 char *service
= strstr(host
, "._");
133 time_t t
= service_timeout(s
);
136 if (!force
&& (!s
->active
|| !service
|| !t
))
144 service_add_ptr(service_instance_name(s
), ttl
);
145 dns_send_answer(iface
, to
, service
);
148 service_add_srv(s
, ttl
);
149 if (s
->txt
&& s
->txt_len
)
150 dns_add_answer(TYPE_TXT
, (uint8_t *) s
->txt
, s
->txt_len
, ttl
);
151 dns_send_answer(iface
, to
, host
);
155 service_reply(struct interface
*iface
, struct sockaddr
*to
, const char *match
, int ttl
)
159 vlist_for_each_element(&services
, s
, node
) {
160 if (!match
|| !strcmp(s
->service
, match
))
161 service_reply_single(iface
, to
, s
, ttl
, 0);
166 service_announce_services(struct interface
*iface
, struct sockaddr
*to
, int ttl
)
170 vlist_for_each_element(&services
, s
, node
) {
174 service_add_ptr(s
->service
, ttl
);
175 dns_send_answer(iface
, to
, C_DNS_SD
);
177 service_reply_single(iface
, to
, s
, ttl
, 0);
182 service_update(struct vlist_tree
*tree
, struct vlist_node
*node_new
,
183 struct vlist_node
*node_old
)
185 struct interface
*iface
;
189 s
= container_of(node_new
, struct service
, node
);
190 if (service_init_announce
)
191 vlist_for_each_element(&interfaces
, iface
, node
) {
193 service_reply_single(iface
, NULL
, s
, announce_ttl
, 1);
198 s
= container_of(node_old
, struct service
, node
);
199 if (!node_new
&& service_init_announce
)
200 vlist_for_each_element(&interfaces
, iface
, node
)
201 service_reply_single(iface
, NULL
, s
, 0, 1);
206 service_load_blob(struct blob_attr
*b
)
208 struct blob_attr
*txt
, *_tb
[__SERVICE_MAX
];
210 char *d_service
, *d_id
;
215 blobmsg_parse(service_policy
, ARRAY_SIZE(service_policy
),
216 _tb
, blobmsg_data(b
), blobmsg_data_len(b
));
217 if (!_tb
[SERVICE_PORT
] || !_tb
[SERVICE_SERVICE
])
220 if (_tb
[SERVICE_TXT
])
221 blobmsg_for_each_attr(txt
, _tb
[SERVICE_TXT
], rem2
)
222 txt_len
+= 1 + strlen(blobmsg_get_string(txt
));
224 s
= calloc_a(sizeof(*s
),
225 &d_id
, strlen(blobmsg_name(b
)) + 1,
226 &d_service
, strlen(blobmsg_get_string(_tb
[SERVICE_SERVICE
])) + 1,
231 s
->port
= blobmsg_get_u32(_tb
[SERVICE_PORT
]);
232 s
->id
= strcpy(d_id
, blobmsg_name(b
));
233 s
->instance
= umdns_host_label
;
234 s
->service
= strcpy(d_service
, blobmsg_get_string(_tb
[SERVICE_SERVICE
]));
237 s
->txt_len
= txt_len
;
240 if (_tb
[SERVICE_TXT
])
241 blobmsg_for_each_attr(txt
, _tb
[SERVICE_TXT
], rem2
) {
242 int len
= strlen(blobmsg_get_string(txt
));
249 memcpy(d_txt
, blobmsg_get_string(txt
), len
);
253 vlist_add(&services
, &s
->node
, s
->id
);
257 service_load(char *path
)
259 struct blob_attr
*cur
;
263 if (glob(path
, GLOB_NOESCAPE
| GLOB_MARK
, NULL
, &gl
))
266 for (i
= 0; i
< gl
.gl_pathc
; i
++) {
267 blob_buf_init(&b
, 0);
268 if (blobmsg_add_json_from_file(&b
, gl
.gl_pathv
[i
])) {
269 blob_for_each_attr(cur
, b
.head
, rem
)
270 service_load_blob(cur
);
272 fprintf(stderr
, "Error reading %s JSON\n", gl
.gl_pathv
[i
]);
279 service_init_cb(struct ubus_request
*req
, int type
, struct blob_attr
*msg
)
281 struct blob_attr
*cur
;
286 vlist_update(&services
);
287 service_load("/etc/umdns/*");
289 blob_for_each_attr(cur
, msg
, rem
) {
290 struct blob_attr
*cur2
;
293 blobmsg_for_each_attr(cur2
, cur
, rem2
) {
294 struct blob_attr
*cur3
;
297 if (strcmp(blobmsg_name(cur2
), "instances"))
300 blobmsg_for_each_attr(cur3
, cur2
, rem3
) {
301 struct blob_attr
*cur4
;
305 blobmsg_for_each_attr(cur4
, cur3
, rem4
) {
306 const char *name
= blobmsg_name(cur4
);
308 if (!strcmp(name
, "running")) {
309 running
= blobmsg_get_bool(cur4
);
310 } else if (running
&& !strcmp(name
, "data")) {
311 struct blob_attr
*cur5
;
314 blobmsg_for_each_attr(cur5
, cur4
, rem5
) {
315 struct blob_attr
*cur6
;
318 if (strcmp(blobmsg_name(cur5
), "mdns"))
321 blobmsg_for_each_attr(cur6
, cur5
, rem6
)
322 service_load_blob(cur6
);
330 vlist_flush(&services
);
334 service_init(int announce
)
338 service_init_announce
= announce
;
339 ubus_service_list(service_init_cb
);
343 service_cleanup(void)
345 vlist_flush(&services
);