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";
70 static int service_init_announce
;
73 service_name(const char *domain
)
75 static char buffer
[256];
77 snprintf(buffer
, sizeof(buffer
), "%s.%s", mdns_hostname
, domain
);
83 service_add_ptr(const char *host
, int ttl
)
85 int len
= dn_comp(host
, mdns_buf
, sizeof(mdns_buf
), NULL
, NULL
);
90 dns_add_answer(TYPE_PTR
, mdns_buf
, len
, ttl
);
94 service_add_srv(struct service
*s
, int ttl
)
96 struct dns_srv_data
*sd
= (struct dns_srv_data
*) mdns_buf
;
97 int len
= sizeof(*sd
);
99 len
+= dn_comp(mdns_hostname_local
, mdns_buf
+ len
, sizeof(mdns_buf
) - len
, NULL
, NULL
);
100 if (len
<= sizeof(*sd
))
103 sd
->port
= cpu_to_be16(s
->port
);
104 dns_add_answer(TYPE_SRV
, mdns_buf
, len
, ttl
);
107 #define TOUT_LOOKUP 60
110 service_timeout(struct service
*s
)
112 time_t t
= time(NULL
);
114 if (t
- s
->t
<= TOUT_LOOKUP
)
123 service_reply_a(struct interface
*iface
, int type
, int ttl
)
125 struct ifaddrs
*ifap
, *ifa
;
126 struct sockaddr_in
*sa
;
127 struct sockaddr_in6
*sa6
;
132 for (ifa
= ifap
; ifa
; ifa
= ifa
->ifa_next
) {
133 if (strcmp(ifa
->ifa_name
, iface
->name
))
135 if (ifa
->ifa_addr
->sa_family
==AF_INET
) {
136 sa
= (struct sockaddr_in
*) ifa
->ifa_addr
;
137 dns_add_answer(TYPE_A
, (uint8_t *) &sa
->sin_addr
, 4, ttl
);
139 if (ifa
->ifa_addr
->sa_family
==AF_INET6
) {
140 uint8_t ll_prefix
[] = {0xfe, 0x80 };
141 sa6
= (struct sockaddr_in6
*) ifa
->ifa_addr
;
142 if (!memcmp(&sa6
->sin6_addr
, &ll_prefix
, 2))
143 dns_add_answer(TYPE_AAAA
, (uint8_t *) &sa6
->sin6_addr
, 16, ttl
);
146 dns_send_answer(iface
, mdns_hostname_local
);
152 service_reply_single(struct interface
*iface
, struct service
*s
, const char *match
, int ttl
, int force
)
154 const char *host
= service_name(s
->service
);
155 char *service
= strstr(host
, "._");
157 if (!force
&& (!s
->active
|| !service
|| !service_timeout(s
)))
162 if (match
&& strcmp(match
, s
->service
))
166 service_add_ptr(service_name(s
->service
), ttl
);
167 dns_send_answer(iface
, service
);
170 service_add_srv(s
, ttl
);
171 if (s
->txt
&& s
->txt_len
)
172 dns_add_answer(TYPE_TXT
, (uint8_t *) s
->txt
, s
->txt_len
, ttl
);
173 dns_send_answer(iface
, host
);
177 service_reply(struct interface
*iface
, const char *match
, int ttl
)
181 vlist_for_each_element(&services
, s
, node
)
182 service_reply_single(iface
, s
, match
, ttl
, 0);
187 service_reply_a(iface
, TYPE_A
, ttl
);
191 service_announce_services(struct interface
*iface
, const char *service
)
196 if (!strcmp(service
, sdudp
))
198 else if (strcmp(service
, sdtcp
))
201 vlist_for_each_element(&services
, s
, node
) {
202 if (!strstr(s
->service
, "._tcp") && tcp
)
204 if (!strstr(s
->service
, "._udp") && !tcp
)
208 service_add_ptr(s
->service
, announce_ttl
);
210 dns_send_answer(iface
, sdtcp
);
212 dns_send_answer(iface
, sdudp
);
213 service_reply(iface
, s
->service
, announce_ttl
);
218 service_announce(struct interface
*iface
)
220 service_announce_services(iface
, sdudp
);
221 service_announce_services(iface
, sdtcp
);
225 service_update(struct vlist_tree
*tree
, struct vlist_node
*node_new
,
226 struct vlist_node
*node_old
)
228 struct interface
*iface
;
232 s
= container_of(node_new
, struct service
, node
);
233 if (service_init_announce
)
234 vlist_for_each_element(&interfaces
, iface
, node
) {
236 service_reply_single(iface
, s
, NULL
, announce_ttl
, 1);
241 s
= container_of(node_old
, struct service
, node
);
242 if (!node_new
&& service_init_announce
)
243 vlist_for_each_element(&interfaces
, iface
, node
)
244 service_reply_single(iface
, s
, NULL
, 0, 1);
249 service_load(char *path
)
251 struct blob_attr
*txt
, *cur
, *_tb
[__SERVICE_MAX
];
255 if (glob(path
, GLOB_NOESCAPE
| GLOB_MARK
, NULL
, &gl
))
258 for (i
= 0; i
< gl
.gl_pathc
; i
++) {
259 blob_buf_init(&b
, 0);
261 if (!blobmsg_add_json_from_file(&b
, gl
.gl_pathv
[i
]))
263 blob_for_each_attr(cur
, b
.head
, rem
) {
265 char *d_service
, *d_daemon
;
270 blobmsg_parse(service_policy
, ARRAY_SIZE(service_policy
),
271 _tb
, blobmsg_data(cur
), blobmsg_data_len(cur
));
272 if (!_tb
[SERVICE_PORT
] || !_tb
[SERVICE_TXT
])
275 blobmsg_for_each_attr(txt
, _tb
[SERVICE_TXT
], rem2
)
276 txt_len
+= 1 + strlen(blobmsg_get_string(txt
));
278 s
= calloc_a(sizeof(*s
),
279 &d_daemon
, strlen(gl
.gl_pathv
[i
]) + 1,
280 &d_service
, strlen(blobmsg_name(cur
)) + 1,
285 s
->port
= blobmsg_get_u32(_tb
[SERVICE_PORT
]);
286 s
->service
= strcpy(d_service
, blobmsg_name(cur
));
287 s
->daemon
= strcpy(d_daemon
, gl
.gl_pathv
[i
]);
290 s
->txt_len
= txt_len
;
293 blobmsg_for_each_attr(txt
, _tb
[SERVICE_TXT
], rem2
) {
294 int len
= strlen(blobmsg_get_string(txt
));
301 memcpy(d_txt
, blobmsg_get_string(txt
), len
);
305 vlist_add(&services
, &s
->node
, s
->service
);
311 service_init(int announce
)
313 service_init_announce
= announce
;
317 vlist_update(&services
);
318 service_load("/tmp/run/mdnsd/*");
319 vlist_flush(&services
);
323 service_cleanup(void)
325 vlist_flush(&services
);