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 *instance
, const char *service_domain
, int ttl
)
159 vlist_for_each_element(&services
, s
, node
) {
160 if (instance
&& strcmp(s
->instance
, instance
))
162 if (service_domain
&& strcmp(s
->service
, service_domain
))
164 service_reply_single(iface
, to
, s
, ttl
, 0);
169 service_announce_services(struct interface
*iface
, struct sockaddr
*to
, int ttl
)
173 vlist_for_each_element(&services
, s
, node
) {
177 service_add_ptr(s
->service
, ttl
);
178 dns_send_answer(iface
, to
, C_DNS_SD
);
180 service_reply_single(iface
, to
, s
, ttl
, 0);
185 service_update(struct vlist_tree
*tree
, struct vlist_node
*node_new
,
186 struct vlist_node
*node_old
)
188 struct interface
*iface
;
192 s
= container_of(node_new
, struct service
, node
);
193 if (service_init_announce
)
194 vlist_for_each_element(&interfaces
, iface
, node
) {
196 service_reply_single(iface
, NULL
, s
, announce_ttl
, 1);
201 s
= container_of(node_old
, struct service
, node
);
202 if (!node_new
&& service_init_announce
)
203 vlist_for_each_element(&interfaces
, iface
, node
)
204 service_reply_single(iface
, NULL
, s
, 0, 1);
209 service_load_blob(struct blob_attr
*b
)
211 struct blob_attr
*txt
, *_tb
[__SERVICE_MAX
];
213 char *d_service
, *d_id
;
218 blobmsg_parse(service_policy
, ARRAY_SIZE(service_policy
),
219 _tb
, blobmsg_data(b
), blobmsg_data_len(b
));
220 if (!_tb
[SERVICE_PORT
] || !_tb
[SERVICE_SERVICE
])
223 if (_tb
[SERVICE_TXT
])
224 blobmsg_for_each_attr(txt
, _tb
[SERVICE_TXT
], rem2
)
225 txt_len
+= 1 + strlen(blobmsg_get_string(txt
));
227 s
= calloc_a(sizeof(*s
),
228 &d_id
, strlen(blobmsg_name(b
)) + 1,
229 &d_service
, strlen(blobmsg_get_string(_tb
[SERVICE_SERVICE
])) + 1,
234 s
->port
= blobmsg_get_u32(_tb
[SERVICE_PORT
]);
235 s
->id
= strcpy(d_id
, blobmsg_name(b
));
236 s
->instance
= umdns_host_label
;
237 s
->service
= strcpy(d_service
, blobmsg_get_string(_tb
[SERVICE_SERVICE
]));
240 s
->txt_len
= txt_len
;
243 if (_tb
[SERVICE_TXT
])
244 blobmsg_for_each_attr(txt
, _tb
[SERVICE_TXT
], rem2
) {
245 int len
= strlen(blobmsg_get_string(txt
));
252 memcpy(d_txt
, blobmsg_get_string(txt
), len
);
256 vlist_add(&services
, &s
->node
, s
->id
);
260 service_load(char *path
)
262 struct blob_attr
*cur
;
266 if (glob(path
, GLOB_NOESCAPE
| GLOB_MARK
, NULL
, &gl
))
269 for (i
= 0; i
< gl
.gl_pathc
; i
++) {
270 blob_buf_init(&b
, 0);
271 if (blobmsg_add_json_from_file(&b
, gl
.gl_pathv
[i
])) {
272 blob_for_each_attr(cur
, b
.head
, rem
)
273 service_load_blob(cur
);
275 fprintf(stderr
, "Error reading %s JSON\n", gl
.gl_pathv
[i
]);
282 service_init_cb(struct ubus_request
*req
, int type
, struct blob_attr
*msg
)
284 struct blob_attr
*cur
;
289 vlist_update(&services
);
290 service_load("/etc/umdns/*");
292 blob_for_each_attr(cur
, msg
, rem
) {
293 struct blob_attr
*cur2
;
296 blobmsg_for_each_attr(cur2
, cur
, rem2
) {
297 struct blob_attr
*cur3
;
300 if (strcmp(blobmsg_name(cur2
), "instances"))
303 blobmsg_for_each_attr(cur3
, cur2
, rem3
) {
304 struct blob_attr
*cur4
;
308 blobmsg_for_each_attr(cur4
, cur3
, rem4
) {
309 const char *name
= blobmsg_name(cur4
);
311 if (!strcmp(name
, "running")) {
312 running
= blobmsg_get_bool(cur4
);
313 } else if (running
&& !strcmp(name
, "data")) {
314 struct blob_attr
*cur5
;
317 blobmsg_for_each_attr(cur5
, cur4
, rem5
) {
318 struct blob_attr
*cur6
;
321 if (strcmp(blobmsg_name(cur5
), "mdns"))
324 blobmsg_for_each_attr(cur6
, cur5
, rem6
)
325 service_load_blob(cur6
);
333 vlist_flush(&services
);
337 service_init(int announce
)
341 service_init_announce
= announce
;
342 ubus_service_list(service_init_cb
);
346 service_cleanup(void)
348 vlist_flush(&services
);