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>
26 #include <libubox/vlist.h>
27 #include <libubox/uloop.h>
28 #include <libubox/avl-cmp.h>
29 #include <libubox/blobmsg_json.h>
34 #include "interface.h"
43 struct vlist_node node
;
55 static const struct blobmsg_policy service_policy
[__SERVICE_MAX
] = {
56 [SERVICE_PORT
] = { .name
= "port", .type
= BLOBMSG_TYPE_INT32
},
57 [SERVICE_TXT
] = { .name
= "txt", .type
= BLOBMSG_TYPE_ARRAY
},
61 service_update(struct vlist_tree
*tree
, struct vlist_node
*node_new
,
62 struct vlist_node
*node_old
);
64 static struct blob_buf b
;
65 static VLIST_TREE(services
, avl_strcmp
, service_update
, false, false);
66 static char *sdudp
= "_services._dns-sd._udp.local";
67 static char *sdtcp
= "_services._dns-sd._tcp.local";
70 service_name(const char *domain
)
72 static char buffer
[256];
74 snprintf(buffer
, sizeof(buffer
), "%s.%s", mdns_hostname
, domain
);
80 service_add_ptr(const char *host
)
82 int len
= dn_comp(host
, mdns_buf
, sizeof(mdns_buf
), NULL
, NULL
);
87 dns_add_answer(TYPE_PTR
, mdns_buf
, len
);
91 service_add_srv(struct service
*s
)
93 struct dns_srv_data
*sd
= (struct dns_srv_data
*) mdns_buf
;
94 int len
= sizeof(*sd
);
96 len
+= dn_comp(mdns_hostname_local
, mdns_buf
+ len
, sizeof(mdns_buf
) - len
, NULL
, NULL
);
97 if (len
<= sizeof(*sd
))
100 sd
->port
= cpu_to_be16(s
->port
);
101 dns_add_answer(TYPE_SRV
, mdns_buf
, len
);
104 #define TOUT_LOOKUP 60
107 service_timeout(struct service
*s
)
109 time_t t
= time(NULL
);
111 if (t
- s
->t
<= TOUT_LOOKUP
)
120 service_reply_a(struct interface
*iface
, int type
)
126 dns_add_answer(TYPE_A
, (uint8_t *) &iface
->v4_addr
.s_addr
, 4);
127 dns_send_answer(iface
, mdns_hostname_local
);
131 service_reply(struct interface
*iface
, const char *match
)
135 vlist_for_each_element(&services
, s
, node
) {
136 const char *host
= service_name(s
->service
);
137 char *service
= strstr(host
, "._");
139 if (!s
->active
|| !service
|| !service_timeout(s
))
144 if (match
&& strcmp(match
, s
->service
))
148 service_add_ptr(service_name(s
->service
));
149 dns_send_answer(iface
, service
);
153 if (s
->txt
&& s
->txt_len
)
154 dns_add_answer(TYPE_TXT
, (uint8_t *) s
->txt
, s
->txt_len
);
155 dns_send_answer(iface
, host
);
161 service_reply_a(iface
, TYPE_A
);
165 service_announce_services(struct interface
*iface
, const char *service
)
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
)
182 service_add_ptr(s
->service
);
184 dns_send_answer(iface
, sdtcp
);
186 dns_send_answer(iface
, sdudp
);
187 service_reply(iface
, s
->service
);
192 service_announce(struct interface
*iface
)
194 service_announce_services(iface
, sdudp
);
195 service_announce_services(iface
, sdtcp
);
199 service_update(struct vlist_tree
*tree
, struct vlist_node
*node_new
,
200 struct vlist_node
*node_old
)
207 s
= container_of(node_old
, struct service
, node
);
212 service_load(char *path
)
214 struct blob_attr
*txt
, *cur
, *_tb
[__SERVICE_MAX
];
218 if (glob(path
, GLOB_NOESCAPE
| GLOB_MARK
, NULL
, &gl
))
221 for (i
= 0; i
< gl
.gl_pathc
; i
++) {
222 blob_buf_init(&b
, 0);
224 if (!blobmsg_add_json_from_file(&b
, gl
.gl_pathv
[i
]))
226 blob_for_each_attr(cur
, b
.head
, rem
) {
228 char *d_service
, *d_daemon
;
233 blobmsg_parse(service_policy
, ARRAY_SIZE(service_policy
),
234 _tb
, blobmsg_data(cur
), blobmsg_data_len(cur
));
235 if (!_tb
[SERVICE_PORT
] || !_tb
[SERVICE_TXT
])
238 blobmsg_for_each_attr(txt
, _tb
[SERVICE_TXT
], rem2
)
239 txt_len
+= 1 + strlen(blobmsg_get_string(txt
));
241 s
= calloc_a(sizeof(*s
),
242 &d_daemon
, strlen(gl
.gl_pathv
[i
]) + 1,
243 &d_service
, strlen(blobmsg_name(cur
)) + 1,
248 s
->port
= blobmsg_get_u32(_tb
[SERVICE_PORT
]);
249 s
->service
= strcpy(d_service
, blobmsg_name(cur
));
250 s
->daemon
= strcpy(d_daemon
, gl
.gl_pathv
[i
]);
253 s
->txt_len
= txt_len
;
256 blobmsg_for_each_attr(txt
, _tb
[SERVICE_TXT
], rem2
) {
257 int len
= strlen(blobmsg_get_string(txt
));
264 memcpy(d_txt
, blobmsg_get_string(txt
), len
);
268 vlist_add(&services
, &s
->node
, s
->service
);
278 vlist_update(&services
);
279 service_load("/tmp/run/mdnsd/*");
280 vlist_flush(&services
);
284 service_cleanup(void)
286 vlist_flush(&services
);