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>
27 #include <libubox/vlist.h>
28 #include <libubox/uloop.h>
29 #include <libubox/avl-cmp.h>
30 #include <libubox/blobmsg_json.h>
35 #include "interface.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
},
63 service_update(struct vlist_tree
*tree
, struct vlist_node
*node_new
,
64 struct vlist_node
*node_old
);
66 static struct blob_buf b
;
67 static VLIST_TREE(services
, avl_strcmp
, service_update
, false, false);
68 static char *sdudp
= "_services._dns-sd._udp.local";
69 static char *sdtcp
= "_services._dns-sd._tcp.local";
72 service_name(const char *domain
)
74 static char buffer
[256];
76 snprintf(buffer
, sizeof(buffer
), "%s.%s", mdns_hostname
, domain
);
82 service_add_ptr(const char *host
, int ttl
)
84 int len
= dn_comp(host
, mdns_buf
, sizeof(mdns_buf
), NULL
, NULL
);
89 dns_add_answer(TYPE_PTR
, mdns_buf
, len
, ttl
);
93 service_add_srv(struct service
*s
, int ttl
)
95 struct dns_srv_data
*sd
= (struct dns_srv_data
*) mdns_buf
;
96 int len
= sizeof(*sd
);
98 len
+= dn_comp(mdns_hostname_local
, mdns_buf
+ len
, sizeof(mdns_buf
) - len
, NULL
, NULL
);
99 if (len
<= sizeof(*sd
))
102 sd
->port
= cpu_to_be16(s
->port
);
103 dns_add_answer(TYPE_SRV
, mdns_buf
, len
, ttl
);
106 #define TOUT_LOOKUP 60
109 service_timeout(struct service
*s
)
111 time_t t
= time(NULL
);
113 if (t
- s
->t
<= TOUT_LOOKUP
)
122 service_reply_a(struct interface
*iface
, int type
, int ttl
)
124 struct ifaddrs
*ifap
, *ifa
;
125 struct sockaddr_in
*sa
;
126 struct sockaddr_in6
*sa6
;
131 for (ifa
= ifap
; ifa
; ifa
= ifa
->ifa_next
) {
132 if (strcmp(ifa
->ifa_name
, iface
->name
))
134 if (ifa
->ifa_addr
->sa_family
==AF_INET
) {
135 sa
= (struct sockaddr_in
*) ifa
->ifa_addr
;
136 dns_add_answer(TYPE_A
, (uint8_t *) &sa
->sin_addr
, 4, ttl
);
138 if (ifa
->ifa_addr
->sa_family
==AF_INET6
) {
139 uint8_t ll_prefix
[] = {0xfe, 0x80 };
140 sa6
= (struct sockaddr_in6
*) ifa
->ifa_addr
;
141 if (!memcmp(&sa6
->sin6_addr
, &ll_prefix
, 2))
142 dns_add_answer(TYPE_AAAA
, (uint8_t *) &sa6
->sin6_addr
, 16, ttl
);
145 dns_send_answer(iface
, mdns_hostname_local
);
151 service_reply_single(struct interface
*iface
, struct service
*s
, const char *match
, int ttl
)
153 const char *host
= service_name(s
->service
);
154 char *service
= strstr(host
, "._");
156 if (!s
->active
|| !service
|| !service_timeout(s
))
161 if (match
&& strcmp(match
, s
->service
))
165 service_add_ptr(service_name(s
->service
), ttl
);
166 dns_send_answer(iface
, service
);
169 service_add_srv(s
, ttl
);
170 if (s
->txt
&& s
->txt_len
)
171 dns_add_answer(TYPE_TXT
, (uint8_t *) s
->txt
, s
->txt_len
, ttl
);
172 dns_send_answer(iface
, host
);
176 service_reply(struct interface
*iface
, const char *match
, int ttl
)
180 vlist_for_each_element(&services
, s
, node
)
181 service_reply_single(iface
, s
, match
, ttl
);
186 service_reply_a(iface
, TYPE_A
, ttl
);
190 service_announce_services(struct interface
*iface
, const char *service
)
195 if (!strcmp(service
, sdudp
))
197 else if (strcmp(service
, sdtcp
))
200 vlist_for_each_element(&services
, s
, node
) {
201 if (!strstr(s
->service
, "._tcp") && tcp
)
203 if (!strstr(s
->service
, "._udp") && !tcp
)
207 service_add_ptr(s
->service
, announce_ttl
);
209 dns_send_answer(iface
, sdtcp
);
211 dns_send_answer(iface
, sdudp
);
212 service_reply(iface
, s
->service
, announce_ttl
);
217 service_announce(struct interface
*iface
)
219 service_announce_services(iface
, sdudp
);
220 service_announce_services(iface
, sdtcp
);
224 service_update(struct vlist_tree
*tree
, struct vlist_node
*node_new
,
225 struct vlist_node
*node_old
)
227 struct interface
*iface
;
233 s
= container_of(node_old
, struct service
, node
);
236 vlist_for_each_element(&interfaces
, iface
, node
)
237 service_reply_single(iface
, s
, NULL
, 0);
243 service_load(char *path
)
245 struct blob_attr
*txt
, *cur
, *_tb
[__SERVICE_MAX
];
249 if (glob(path
, GLOB_NOESCAPE
| GLOB_MARK
, NULL
, &gl
))
252 for (i
= 0; i
< gl
.gl_pathc
; i
++) {
253 blob_buf_init(&b
, 0);
255 if (!blobmsg_add_json_from_file(&b
, gl
.gl_pathv
[i
]))
257 blob_for_each_attr(cur
, b
.head
, rem
) {
259 char *d_service
, *d_daemon
;
264 blobmsg_parse(service_policy
, ARRAY_SIZE(service_policy
),
265 _tb
, blobmsg_data(cur
), blobmsg_data_len(cur
));
266 if (!_tb
[SERVICE_PORT
] || !_tb
[SERVICE_TXT
])
269 blobmsg_for_each_attr(txt
, _tb
[SERVICE_TXT
], rem2
)
270 txt_len
+= 1 + strlen(blobmsg_get_string(txt
));
272 s
= calloc_a(sizeof(*s
),
273 &d_daemon
, strlen(gl
.gl_pathv
[i
]) + 1,
274 &d_service
, strlen(blobmsg_name(cur
)) + 1,
279 s
->port
= blobmsg_get_u32(_tb
[SERVICE_PORT
]);
280 s
->service
= strcpy(d_service
, blobmsg_name(cur
));
281 s
->daemon
= strcpy(d_daemon
, gl
.gl_pathv
[i
]);
284 s
->txt_len
= txt_len
;
287 blobmsg_for_each_attr(txt
, _tb
[SERVICE_TXT
], rem2
) {
288 int len
= strlen(blobmsg_get_string(txt
));
295 memcpy(d_txt
, blobmsg_get_string(txt
), len
);
299 vlist_add(&services
, &s
->node
, s
->service
);
309 vlist_update(&services
);
310 service_load("/tmp/run/mdnsd/*");
311 vlist_flush(&services
);
315 service_cleanup(void)
317 vlist_flush(&services
);