08f6308dc6fa6e6d5ba30b409cd08b06df152370
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.
15 #include <sys/types.h>
23 #include <sys/types.h>
24 #include <sys/socket.h>
25 #include <netinet/in.h>
26 #include <arpa/inet.h>
27 #include <arpa/nameser.h>
31 #include <libubox/usock.h>
32 #include <libubox/uloop.h>
33 #include <libubox/avl-cmp.h>
34 #include <libubox/blobmsg_json.h>
35 #include <libubox/kvlist.h>
41 #include "interface.h"
43 static struct uloop_timeout cache_gc
;
44 struct avl_tree services
;
45 AVL_TREE(records
, avl_strcmp
, true, NULL
);
48 cache_record_free(struct cache_record
*r
)
50 DBG(2, "%s %s\n", dns_type_string(r
->type
), r
->record
);
51 avl_delete(&records
, &r
->avl
);
56 cache_service_free(struct cache_service
*s
)
58 DBG(2, "%s\n", s
->entry
);
59 avl_delete(&services
, &s
->avl
);
64 cache_is_expired(time_t t
, uint32_t ttl
, int frac
)
66 if (monotonic_time() - t
>= ttl
* frac
/ 100)
73 cache_gc_timer(struct uloop_timeout
*timeout
)
75 struct cache_record
*r
, *p
;
76 struct cache_service
*s
, *t
;
78 avl_for_each_element_safe(&records
, r
, avl
, p
) {
79 if (!cache_is_expired(r
->time
, r
->ttl
, 100))
81 /* Records other and A(AAA) are handled as services */
82 if (r
->type
!= TYPE_A
&& r
->type
!= TYPE_AAAA
) {
86 if (r
->refresh
>= 100) {
91 dns_send_question(r
->iface
, r
->record
, r
->type
, 0);
94 avl_for_each_element_safe(&services
, s
, avl
, t
) {
97 if (!cache_is_expired(s
->time
, s
->ttl
, s
->refresh
))
99 if (s
->refresh
>= 100) {
100 cache_service_free(s
);
104 if (cache_service_is_host(s
))
106 dns_send_question(s
->iface
, s
->entry
, TYPE_PTR
, 0);
109 uloop_timeout_set(timeout
, 10000);
115 avl_init(&services
, avl_strcmp
, true, NULL
);
117 cache_gc
.cb
= cache_gc_timer
;
118 uloop_timeout_set(&cache_gc
, 10000);
123 void cache_cleanup(struct interface
*iface
)
125 struct cache_record
*r
, *p
;
126 struct cache_service
*s
, *t
;
128 avl_for_each_element_safe(&services
, s
, avl
, t
)
129 if (!iface
|| iface
== s
->iface
)
130 cache_service_free(s
);
132 avl_for_each_element_safe(&records
, r
, avl
, p
)
133 if (!iface
|| iface
== r
->iface
)
134 cache_record_free(r
);
140 struct interface
*iface
;
141 struct cache_service
*s
;
143 vlist_for_each_element(&interfaces
, iface
, node
)
144 avl_for_each_element(&services
, s
, avl
)
145 dns_send_question(iface
, s
->entry
, TYPE_PTR
, 0);
148 static struct cache_service
*
149 cache_service(struct interface
*iface
, char *entry
, int hlen
, int ttl
)
151 struct cache_service
*s
, *t
;
156 avl_for_each_element_safe(&services
, s
, avl
, t
)
157 if (!strcmp(s
->entry
, entry
)) {
159 s
->time
= monotonic_time();
164 s
= calloc_a(sizeof(*s
),
165 &entry_buf
, strlen(entry
) + 1,
166 &host_buf
, hlen
? hlen
+ 1 : 0);
168 s
->avl
.key
= s
->entry
= strcpy(entry_buf
, entry
);
169 s
->time
= monotonic_time();
175 s
->host
= strncpy(host_buf
, s
->entry
, hlen
);
177 type
= strstr(entry_buf
, "._");
182 avl_insert(&services
, &s
->avl
);
185 dns_send_question(iface
, entry
, TYPE_PTR
, iface
->multicast
);
190 static struct cache_record
*
191 cache_record_find(char *record
, int type
, int port
, int rdlength
, uint8_t *rdata
)
193 struct cache_record
*l
= avl_find_element(&records
, record
, l
, avl
);
198 while (l
&& l
->record
&& !strcmp(l
->record
, record
)) {
199 struct cache_record
*r
= l
;
201 l
= avl_next_element(l
, avl
);
205 if (r
->type
== TYPE_TXT
|| (r
->type
== TYPE_SRV
))
211 if (r
->rdlength
!= rdlength
)
214 if (!!r
->rdata
!= !!rdata
)
217 if (!r
->rdata
|| !rdata
|| memcmp(r
->rdata
, rdata
, rdlength
))
227 cache_host_is_known(char *record
)
229 struct cache_record
*l
= avl_find_element(&records
, record
, l
, avl
);
234 while (l
&& !avl_is_last(&records
, &l
->avl
) && !strcmp(l
->record
, record
)) {
235 struct cache_record
*r
= l
;
237 l
= avl_next_element(l
, avl
);
238 if ((r
->type
!= TYPE_A
) && (r
->type
!= TYPE_AAAA
))
247 cache_answer(struct interface
*iface
, uint8_t *base
, int blen
, char *name
, struct dns_answer
*a
, uint8_t *rdata
, int flush
)
249 struct dns_srv_data
*dsd
= (struct dns_srv_data
*) rdata
;
250 struct cache_record
*r
;
251 int port
= 0, dlen
= 0, tlen
= 0, nlen
, rdlength
;
254 void *rdata_ptr
, *txt_ptr
;
256 static char *rdata_buffer
= (char *) mdns_buf
;
257 time_t now
= monotonic_time();
266 if (dn_expand(base
, base
+ blen
, rdata
, rdata_buffer
, MAX_DATA_LEN
) < 0) {
267 perror("process_answer/dn_expand");
271 DBG(1, "A -> %s %s %s ttl:%d\n", dns_type_string(a
->type
), name
, rdata_buffer
, a
->ttl
);
273 rdlength
= strlen(rdata_buffer
);
275 if (strcmp(C_DNS_SD
, name
) != 0 &&
276 nlen
+ 1 < rdlength
&& !strcmp(rdata_buffer
+ rdlength
- nlen
, name
))
277 host_len
= rdlength
- nlen
- 1;
279 cache_service(iface
, rdata_buffer
, host_len
, a
->ttl
);
281 dlen
= strlen(rdata_buffer
) + 1;
282 rdata
= (uint8_t*)rdata_buffer
;
289 port
= be16_to_cpu(dsd
->port
);
290 memcpy(rdata_buffer
, dsd
, sizeof(*dsd
));
291 if (dn_expand(base
, base
+ blen
, (const uint8_t*)&dsd
[1],
292 &rdata_buffer
[sizeof(*dsd
)], MAX_DATA_LEN
- sizeof(*dsd
)) < 0) {
293 perror("process_answer/dn_expand");
296 dlen
= sizeof(*dsd
) + strlen(&rdata_buffer
[sizeof(*dsd
)]) + 1;
297 rdata
= (uint8_t*)rdata_buffer
;
301 rdlength
= a
->rdlength
;
305 memcpy(rdata_buffer
, &rdata
[1], rdlength
);
306 rdata_buffer
[rdlength
] = rdata_buffer
[rdlength
+ 1] = '\0';
308 p
= &rdata_buffer
[*rdata
];
314 if (v
&& p
+ v
< &rdata_buffer
[rdlength
])
320 cache_service(iface
, name
, strlen(name
), a
->ttl
);
321 if (a
->rdlength
!= 4)
327 cache_service(iface
, name
, strlen(name
), a
->ttl
);
328 if (a
->rdlength
!= 16)
337 r
= cache_record_find(name
, a
->type
, port
, dlen
, rdata
);
340 DBG(1, "D -> %s %s ttl:%d\n", dns_type_string(r
->type
), r
->record
, r
->ttl
);
341 r
->time
= now
+ 1 - r
->ttl
;
345 DBG(1, "A -> %s %s ttl:%d\n", dns_type_string(r
->type
), r
->record
, r
->ttl
);
353 r
= calloc_a(sizeof(*r
),
354 &name_buf
, strlen(name
) + 1,
358 r
->avl
.key
= r
->record
= strcpy(name_buf
, name
);
367 r
->txt
= memcpy(txt_ptr
, rdata_buffer
, tlen
);
370 r
->rdata
= memcpy(rdata_ptr
, rdata
, dlen
);
372 if (avl_insert(&records
, &r
->avl
))
375 DBG(1, "A -> %s %s ttl:%d\n", dns_type_string(r
->type
), r
->record
, r
->ttl
);
379 cache_dump_records(struct blob_buf
*buf
, const char *name
)
381 struct cache_record
*r
, *last
, *next
;
383 char buffer
[INET6_ADDRSTRLEN
];
385 last
= avl_last_element(&records
, last
, avl
);
386 for (r
= avl_find_element(&records
, name
, r
, avl
); r
; r
= next
) {
389 if (r
->txt
&& strlen(r
->txt
)) {
392 blobmsg_add_string(buf
, "txt", txt
);
393 txt
= &txt
[strlen(txt
) + 1];
400 blobmsg_add_u32(buf
, "port", r
->port
);
404 if ((r
->rdlength
== 4) && inet_ntop(AF_INET
, r
->rdata
, buffer
, INET6_ADDRSTRLEN
))
405 blobmsg_add_string(buf
, "ipv4", buffer
);
409 if ((r
->rdlength
== 16) && inet_ntop(AF_INET6
, r
->rdata
, buffer
, INET6_ADDRSTRLEN
))
410 blobmsg_add_string(buf
, "ipv6", buffer
);
417 next
= avl_next_element(r
, avl
);
418 if (strcmp(r
->record
, next
->record
) != 0)
424 cache_dump_recursive(struct blob_buf
*b
, const char *name
, uint16_t type
, struct interface
*iface
)
426 time_t now
= monotonic_time();
427 for (struct cache_record
*r
= avl_find_ge_element(&records
, name
, r
, avl
);
428 r
&& !strcmp(r
->record
, name
);
429 r
= !avl_is_last(&records
, &r
->avl
) ? avl_next_element(r
, avl
) : NULL
) {
430 int32_t ttl
= r
->ttl
- (now
- r
->time
);
431 if (ttl
<= 0 || (iface
&& iface
->ifindex
!= r
->iface
->ifindex
) ||
432 (type
!= TYPE_ANY
&& type
!= r
->type
))
436 char buf
[INET6_ADDRSTRLEN
];
437 void *k
= blobmsg_open_table(b
, NULL
), *l
;
438 const struct dns_srv_data
*dsd
= (const struct dns_srv_data
*)r
->rdata
;
440 blobmsg_add_string(b
, "name", r
->record
);
441 blobmsg_add_string(b
, "type", dns_type_string(r
->type
));
442 blobmsg_add_u32(b
, "ttl", ttl
);
446 if ((txt
= r
->txt
) && strlen(txt
)) {
447 l
= blobmsg_open_array(b
, "data");
449 blobmsg_add_string(b
, NULL
, txt
);
450 txt
= &txt
[strlen(txt
) + 1];
452 blobmsg_close_array(b
, l
);
457 if (r
->rdlength
> sizeof(*dsd
)) {
458 blobmsg_add_u32(b
, "priority", be16_to_cpu(dsd
->priority
));
459 blobmsg_add_u32(b
, "weight", be16_to_cpu(dsd
->weight
));
460 blobmsg_add_u32(b
, "port", be16_to_cpu(dsd
->port
));
461 blobmsg_add_string(b
, "target", (const char*)&dsd
[1]);
467 blobmsg_add_string(b
, "target", (const char*)r
->rdata
);
471 if ((r
->rdlength
== 4) && inet_ntop(AF_INET
, r
->rdata
, buf
, sizeof(buf
)))
472 blobmsg_add_string(b
, "target", buf
);
476 if ((r
->rdlength
== 16) && inet_ntop(AF_INET6
, r
->rdata
, buf
, sizeof(buf
)))
477 blobmsg_add_string(b
, "target", buf
);
481 blobmsg_close_table(b
, k
);
484 if (r
->type
== TYPE_PTR
) {
485 cache_dump_recursive(b
, (const char*)r
->rdata
, TYPE_SRV
, iface
);
486 cache_dump_recursive(b
, (const char*)r
->rdata
, TYPE_TXT
, iface
);
489 if (r
->type
== TYPE_SRV
) {
490 cache_dump_recursive(b
, (const char*)&dsd
[1], TYPE_A
, iface
);
491 cache_dump_recursive(b
, (const char*)&dsd
[1], TYPE_AAAA
, iface
);