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 <netinet/in.h>
16 #include <arpa/nameser.h>
17 #include <sys/socket.h>
18 #include <netinet/in.h>
19 #include <arpa/inet.h>
29 #include <libubox/vlist.h>
30 #include <libubox/uloop.h>
31 #include <libubox/avl-cmp.h>
32 #include <libubox/blobmsg_json.h>
45 struct vlist_node node
;
57 static const struct blobmsg_policy service_policy
[__SERVICE_MAX
] = {
58 [SERVICE_PORT
] = { .name
= "port", .type
= BLOBMSG_TYPE_INT32
},
59 [SERVICE_TXT
] = { .name
= "txt", .type
= BLOBMSG_TYPE_ARRAY
},
62 static const struct uci_blob_param_list service_attr_list
= {
63 .n_params
= __SERVICE_MAX
,
64 .params
= service_policy
,
68 service_update(struct vlist_tree
*tree
, struct vlist_node
*node_new
,
69 struct vlist_node
*node_old
);
71 static struct blob_buf b
;
72 static VLIST_TREE(services
, avl_strcmp
, service_update
, false, false);
73 char *hostname
= NULL
;
74 static char *sdudp
= "_services._dns-sd._udp.local";
75 static char *sdtcp
= "_services._dns-sd._tcp.local";
78 service_name(const char *domain
)
80 static char buffer
[256];
82 snprintf(buffer
, sizeof(buffer
), "%s.%s", hostname
, domain
);
88 service_send_ptr(struct uloop_fd
*u
, struct service
*s
)
90 unsigned char buffer
[MAX_NAME_LEN
];
91 const char *host
= service_name(s
->service
);
92 int len
= dn_comp(host
, buffer
, MAX_NAME_LEN
, NULL
, NULL
);
97 dns_add_answer(TYPE_PTR
, buffer
, len
);
101 service_send_ptr_c(struct uloop_fd
*u
, const char *host
)
103 unsigned char buffer
[MAX_NAME_LEN
];
104 int len
= dn_comp(host
, buffer
, MAX_NAME_LEN
, NULL
, NULL
);
109 dns_add_answer(TYPE_PTR
, buffer
, len
);
113 service_send_a(struct uloop_fd
*u
)
115 unsigned char buffer
[MAX_NAME_LEN
];
116 char *host
= service_name("local");
117 int len
= dn_comp(host
, buffer
, MAX_NAME_LEN
, NULL
, NULL
);
120 if (!inet_aton(iface_ip
, &in
)) {
121 fprintf(stderr
, "%s is not valid\n", iface_ip
);
128 dns_add_answer(TYPE_A
, (uint8_t *) &in
.s_addr
, 4);
132 service_send_srv(struct uloop_fd
*u
, struct service
*s
)
134 unsigned char buffer
[MAX_NAME_LEN
];
135 struct dns_srv_data
*sd
;
136 char *host
= service_name("local");
137 int len
= dn_comp(host
, buffer
, MAX_NAME_LEN
, NULL
, NULL
);
142 sd
= calloc(1, len
+ sizeof(struct dns_srv_data
));
146 sd
->port
= cpu_to_be16(s
->port
);
147 memcpy(&sd
[1], buffer
, len
);
148 host
= service_name(s
->service
);
149 dns_add_answer(TYPE_SRV
, (uint8_t *) sd
, len
+ sizeof(struct dns_srv_data
));
153 #define TOUT_LOOKUP 60
156 service_timeout(struct service
*s
)
158 time_t t
= time(NULL
);
160 if (t
- s
->t
<= TOUT_LOOKUP
)
169 service_reply_a(struct uloop_fd
*u
, int type
)
176 dns_send_answer(u
, service_name("local"));
180 service_reply(struct uloop_fd
*u
, const char *match
)
184 vlist_for_each_element(&services
, s
, node
) {
185 char *host
= service_name(s
->service
);
186 char *service
= strstr(host
, "._");
188 if (!s
->active
|| !service
|| !service_timeout(s
))
193 if (match
&& strcmp(match
, s
->service
))
197 service_send_ptr(u
, s
);
198 dns_send_answer(u
, service
);
201 service_send_srv(u
, s
);
202 if (s
->txt
&& s
->txt_len
)
203 dns_add_answer(TYPE_TXT
, (uint8_t *) s
->txt
, s
->txt_len
);
204 dns_send_answer(u
, host
);
212 dns_send_answer(u
, service_name("local"));
216 service_announce_services(struct uloop_fd
*u
, const char *service
)
221 if (!strcmp(service
, sdudp
))
223 else if (strcmp(service
, sdtcp
))
226 vlist_for_each_element(&services
, s
, node
) {
227 if (!strstr(s
->service
, "._tcp") && tcp
)
229 if (!strstr(s
->service
, "._udp") && !tcp
)
233 service_send_ptr_c(u
, s
->service
);
235 dns_send_answer(u
, sdtcp
);
237 dns_send_answer(u
, sdudp
);
238 service_reply(u
, s
->service
);
243 service_announce(struct uloop_fd
*u
)
245 service_announce_services(u
, sdudp
);
246 service_announce_services(u
, sdtcp
);
250 service_update(struct vlist_tree
*tree
, struct vlist_node
*node_new
,
251 struct vlist_node
*node_old
)
258 s
= container_of(node_old
, struct service
, node
);
263 service_load(char *path
)
265 struct blob_attr
*txt
, *cur
, *_tb
[__SERVICE_MAX
];
269 if (glob(path
, GLOB_NOESCAPE
| GLOB_MARK
, NULL
, &gl
))
272 for (i
= 0; i
< gl
.gl_pathc
; i
++) {
273 blob_buf_init(&b
, 0);
275 if (!blobmsg_add_json_from_file(&b
, gl
.gl_pathv
[i
]))
277 blob_for_each_attr(cur
, b
.head
, rem
) {
279 char *d_service
, *d_daemon
;
284 blobmsg_parse(service_policy
, ARRAY_SIZE(service_policy
),
285 _tb
, blobmsg_data(cur
), blobmsg_data_len(cur
));
286 if (!_tb
[SERVICE_PORT
] || !_tb
[SERVICE_TXT
])
289 blobmsg_for_each_attr(txt
, _tb
[SERVICE_TXT
], rem2
)
290 txt_len
+= 1 + strlen(blobmsg_get_string(txt
));
292 s
= calloc_a(sizeof(*s
),
293 &d_daemon
, strlen(gl
.gl_pathv
[i
]) + 1,
294 &d_service
, strlen(blobmsg_name(cur
)) + 1,
299 s
->port
= blobmsg_get_u32(_tb
[SERVICE_PORT
]);
300 s
->service
= strcpy(d_service
, blobmsg_name(cur
));
301 s
->daemon
= strcpy(d_daemon
, gl
.gl_pathv
[i
]);
304 s
->txt_len
= txt_len
;
307 blobmsg_for_each_attr(txt
, _tb
[SERVICE_TXT
], rem2
) {
308 int len
= strlen(blobmsg_get_string(txt
));
315 memcpy(d_txt
, blobmsg_get_string(txt
), len
);
319 vlist_add(&services
, &s
->node
, s
->service
);
328 hostname
= get_hostname();
330 vlist_update(&services
);
331 service_load("/tmp/run/mdnsd/*");
332 vlist_flush(&services
);
336 service_cleanup(void)
338 vlist_flush(&services
);