#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
-#include <asm/byteorder.h>
#include <arpa/nameser.h>
#include <resolv.h>
#include <time.h>
#include "interface.h"
static struct uloop_timeout cache_gc;
-struct avl_tree records, entries, hosts;
+struct avl_tree services;
+static AVL_TREE(records, avl_strcmp, true, NULL);
static void
cache_record_free(struct cache_record *r)
}
static void
-cache_entry_free(struct cache_entry *s)
+cache_service_free(struct cache_service *s)
{
DBG(2, "%s\n", s->entry);
- avl_delete(&entries, &s->avl);
+ avl_delete(&services, &s->avl);
free(s);
}
cache_gc_timer(struct uloop_timeout *timeout)
{
struct cache_record *r, *p;
- struct cache_entry *s, *t;
+ struct cache_service *s, *t;
avl_for_each_element_safe(&records, r, avl, p)
if (cache_is_expired(r->time, r->ttl))
cache_record_free(r);
- avl_for_each_element_safe(&entries, s, avl, t) {
+ avl_for_each_element_safe(&services, s, avl, t) {
if (!s->host)
continue;
if (cache_is_expired(s->time, s->ttl))
- cache_entry_free(s);
+ cache_service_free(s);
}
uloop_timeout_set(timeout, 10000);
int
cache_init(void)
{
- avl_init(&entries, avl_strcmp, true, NULL);
- avl_init(&records, avl_strcmp, true, NULL);
+ avl_init(&services, avl_strcmp, true, NULL);
cache_gc.cb = cache_gc_timer;
uloop_timeout_set(&cache_gc, 10000);
return 0;
}
-void cache_cleanup(void)
+void cache_cleanup(struct interface *iface)
{
struct cache_record *r, *p;
- struct cache_entry *s, *t;
+ struct cache_service *s, *t;
- avl_for_each_element_safe(&records, r, avl, p)
- cache_record_free(r);
+ avl_for_each_element_safe(&services, s, avl, t)
+ if (!iface || iface == s->iface)
+ cache_service_free(s);
- avl_for_each_element_safe(&entries, s, avl, t)
- cache_entry_free(s);
+ avl_for_each_element_safe(&records, r, avl, p)
+ if (!iface || iface == r->iface)
+ cache_record_free(r);
}
void
cache_scan(void)
{
- struct cache_entry *s;
+ struct interface *iface;
+ struct cache_service *s;
- avl_for_each_element(&entries, s, avl)
- dns_send_question(cur_iface, s->entry, TYPE_PTR);
+ vlist_for_each_element(&interfaces, iface, node)
+ avl_for_each_element(&services, s, avl)
+ dns_send_question(iface, s->entry, TYPE_PTR, 1);
}
-static struct cache_entry*
-cache_entry(struct interface *iface, char *entry, int hlen, int ttl)
+static struct cache_service*
+cache_service(struct interface *iface, char *entry, int hlen, int ttl)
{
- struct cache_entry *s;
+ struct cache_service *s, *t;
char *entry_buf;
char *host_buf;
char *type;
- s = avl_find_element(&entries, entry, s, avl);
- if (s)
- return s;
+ avl_for_each_element_safe(&services, s, avl, t)
+ if (!strcmp(s->entry, entry))
+ return s;
s = calloc_a(sizeof(*s),
&entry_buf, strlen(entry) + 1,
s->avl.key = s->entry = strcpy(entry_buf, entry);
s->time = time(NULL);
s->ttl = ttl;
+ s->iface = iface;
if (hlen)
s->host = strncpy(host_buf, s->entry, hlen);
type++;
if (type)
s->avl.key = type;
- avl_insert(&entries, &s->avl);
+ avl_insert(&services, &s->avl);
if (!hlen)
- dns_send_question(iface, entry, TYPE_PTR);
+ dns_send_question(iface, entry, TYPE_PTR, !iface->multicast);
return s;
}
if (!l)
return NULL;
- while (l && !avl_is_last(&records, &l->avl) && !strcmp(l->record, record)) {
+ while (l && l->record && !strcmp(l->record, record)) {
struct cache_record *r = l;
l = avl_next_element(l, avl);
}
void
-cache_answer(struct interface *iface, uint8_t *base, int blen, char *name, struct dns_answer *a, uint8_t *rdata)
+cache_answer(struct interface *iface, uint8_t *base, int blen, char *name, struct dns_answer *a, uint8_t *rdata, int flush)
{
struct dns_srv_data *dsd = (struct dns_srv_data *) rdata;
struct cache_record *r;
char *name_buf;
void *rdata_ptr, *txt_ptr;
int host_len = 0;
-
- if (!(a->class & CLASS_IN))
- return;
+ static char *rdata_buffer = (char *) mdns_buf;
nlen = strlen(name);
return;
}
- DBG(1, "A -> %s %s %s\n", dns_type_string(a->type), name, rdata_buffer);
+ DBG(1, "A -> %s %s %s ttl:%d\n", dns_type_string(a->type), name, rdata_buffer, a->ttl);
rdlength = strlen(rdata_buffer);
nlen + 1 < rdlength && !strcmp(rdata_buffer + rdlength - nlen, name))
host_len = rdlength - nlen - 1;
- cache_entry(iface, rdata_buffer, host_len, a->ttl);
+ cache_service(iface, rdata_buffer, host_len, a->ttl);
return;
case TYPE_SRV:
uint8_t v = *p;
*p = '\0';
- if (v)
+ if (v && p + v < &rdata_buffer[rdlength])
p += v + 1;
} while (*p);
break;
case TYPE_A:
- cache_entry(iface, name, strlen(name), a->ttl);
+ cache_service(iface, name, strlen(name), a->ttl);
if (a->rdlength != 4)
return;
dlen = 4;
break;
case TYPE_AAAA:
- cache_entry(iface, name, strlen(name), a->ttl);
+ cache_service(iface, name, strlen(name), a->ttl);
if (a->rdlength != 16)
return;
dlen = 16;
r = cache_record_find(name, a->type, port, dlen, rdata);
if (r) {
if (!a->ttl) {
- cache_record_free(r);
DBG(1, "D -> %s %s ttl:%d\n", dns_type_string(r->type), r->record, r->ttl);
+ r->time = time(0) + 1 - r->ttl;
} else {
r->ttl = a->ttl;
DBG(1, "A -> %s %s ttl:%d\n", dns_type_string(r->type), r->record, r->ttl);
r->port = port;
r->rdlength = dlen;
r->time = time(NULL);
+ r->iface = iface;
if (tlen)
r->txt = memcpy(txt_ptr, rdata_buffer, tlen);
else
DBG(1, "A -> %s %s ttl:%d\n", dns_type_string(r->type), r->record, r->ttl);
}
+
+void
+cache_dump_records(struct blob_buf *buf, const char *name)
+{
+ struct cache_record *r, *last, *next;
+ const char *txt;
+ char buffer[INET6_ADDRSTRLEN];
+
+ last = avl_last_element(&records, last, avl);
+ for (r = avl_find_element(&records, name, r, avl); r; r = next) {
+ switch (r->type) {
+ case TYPE_TXT:
+ if (r->txt && strlen(r->txt)) {
+ txt = r->txt;
+ do {
+ blobmsg_add_string(buf, "txt", txt);
+ txt = &txt[strlen(txt) + 1];
+ } while (*txt);
+ }
+ break;
+
+ case TYPE_SRV:
+ if (r->port)
+ blobmsg_add_u32(buf, "port", r->port);
+ break;
+
+ case TYPE_A:
+ if ((r->rdlength == 4) && inet_ntop(AF_INET, r->rdata, buffer, INET6_ADDRSTRLEN))
+ blobmsg_add_string(buf, "ipv4", buffer);
+ break;
+
+ case TYPE_AAAA:
+ if ((r->rdlength == 16) && inet_ntop(AF_INET6, r->rdata, buffer, INET6_ADDRSTRLEN))
+ blobmsg_add_string(buf, "ipv6", buffer);
+ break;
+ }
+
+ if (r == last)
+ break;
+
+ next = avl_next_element(r, avl);
+ if (strcmp(r->record, next->record) != 0)
+ break;
+ }
+}