Renamed the misleading libc/netbsd directory to libc/dns.
Bug: 13219633 Change-Id: Ide43add0b90b3081cc709a22d1ff1f59d65f1104
This commit is contained in:
Calin Juravle
225
libc/dns/resolv/res_state.c
Normal file
225
libc/dns/resolv/res_state.c
Normal file
@@ -0,0 +1,225 @@
|
||||
/*
|
||||
* Copyright (C) 2008 The Android Open Source Project
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
* * Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* * Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in
|
||||
* the documentation and/or other materials provided with the
|
||||
* distribution.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
||||
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
||||
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
||||
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
||||
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
|
||||
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||
* SUCH DAMAGE.
|
||||
*/
|
||||
#include <sys/cdefs.h>
|
||||
#include <sys/types.h>
|
||||
#include <arpa/inet.h>
|
||||
#include "arpa_nameser.h"
|
||||
#include <netdb.h>
|
||||
#include "resolv_private.h"
|
||||
#include "resolv_cache.h"
|
||||
#include <pthread.h>
|
||||
#include <stdlib.h>
|
||||
|
||||
#define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_
|
||||
#include <sys/_system_properties.h>
|
||||
|
||||
/* Set to 1 to enable debug traces */
|
||||
#define DEBUG 0
|
||||
|
||||
#if DEBUG
|
||||
# include "private/libc_logging.h"
|
||||
# include <unistd.h> /* for gettid() */
|
||||
# define D(...) __libc_format_log(ANDROID_LOG_DEBUG,"libc", __VA_ARGS__)
|
||||
#else
|
||||
# define D(...) do{}while(0)
|
||||
#endif
|
||||
|
||||
static pthread_key_t _res_key;
|
||||
static pthread_once_t _res_once = PTHREAD_ONCE_INIT;
|
||||
|
||||
typedef struct {
|
||||
int _h_errno;
|
||||
struct __res_state _nres[1];
|
||||
unsigned _serial;
|
||||
struct prop_info* _pi;
|
||||
struct res_static _rstatic[1];
|
||||
} _res_thread;
|
||||
|
||||
static _res_thread*
|
||||
_res_thread_alloc(void)
|
||||
{
|
||||
_res_thread* rt = calloc(1, sizeof(*rt));
|
||||
|
||||
if (rt) {
|
||||
rt->_h_errno = 0;
|
||||
/* Special system property which tracks any changes to 'net.*'. */
|
||||
rt->_serial = 0;
|
||||
rt->_pi = (struct prop_info*) __system_property_find("net.change");
|
||||
if (rt->_pi) {
|
||||
rt->_serial = __system_property_serial(rt->_pi);
|
||||
}
|
||||
memset(rt->_rstatic, 0, sizeof rt->_rstatic);
|
||||
}
|
||||
return rt;
|
||||
}
|
||||
|
||||
static void
|
||||
_res_static_done( res_static rs )
|
||||
{
|
||||
/* fortunately, there is nothing to do here, since the
|
||||
* points in h_addr_ptrs and host_aliases should all
|
||||
* point to 'hostbuf'
|
||||
*/
|
||||
if (rs->hostf) { /* should not happen in theory, but just be safe */
|
||||
fclose(rs->hostf);
|
||||
rs->hostf = NULL;
|
||||
}
|
||||
free(rs->servent.s_aliases);
|
||||
}
|
||||
|
||||
static void
|
||||
_res_thread_free( void* _rt )
|
||||
{
|
||||
_res_thread* rt = _rt;
|
||||
|
||||
D("%s: rt=%p for thread=%d", __FUNCTION__, rt, gettid());
|
||||
|
||||
_res_static_done(rt->_rstatic);
|
||||
res_ndestroy(rt->_nres);
|
||||
free(rt);
|
||||
}
|
||||
|
||||
static void
|
||||
_res_init_key( void )
|
||||
{
|
||||
pthread_key_create( &_res_key, _res_thread_free );
|
||||
}
|
||||
|
||||
static _res_thread*
|
||||
_res_thread_get(void)
|
||||
{
|
||||
_res_thread* rt;
|
||||
pthread_once( &_res_once, _res_init_key );
|
||||
rt = pthread_getspecific( _res_key );
|
||||
|
||||
if (rt != NULL) {
|
||||
/* We already have one thread-specific DNS state object.
|
||||
* Check the serial value for any changes to net.* properties */
|
||||
D("%s: Called for tid=%d rt=%p rt->pi=%p rt->serial=%d",
|
||||
__FUNCTION__, gettid(), rt, rt->_pi, rt->_serial);
|
||||
if (rt->_pi == NULL) {
|
||||
/* The property wasn't created when _res_thread_get() was
|
||||
* called the last time. This should only happen very
|
||||
* early during the boot sequence. First, let's try to see if it
|
||||
* is here now. */
|
||||
rt->_pi = (struct prop_info*) __system_property_find("net.change");
|
||||
if (rt->_pi == NULL) {
|
||||
/* Still nothing, return current state */
|
||||
D("%s: exiting for tid=%d rt=%d since system property not found",
|
||||
__FUNCTION__, gettid(), rt);
|
||||
return rt;
|
||||
}
|
||||
}
|
||||
if (rt->_serial == __system_property_serial(rt->_pi)) {
|
||||
/* Nothing changed, so return the current state */
|
||||
D("%s: tid=%d rt=%p nothing changed, returning",
|
||||
__FUNCTION__, gettid(), rt);
|
||||
return rt;
|
||||
}
|
||||
/* Update the recorded serial number, and go reset the state */
|
||||
rt->_serial = __system_property_serial(rt->_pi);
|
||||
goto RESET_STATE;
|
||||
}
|
||||
|
||||
/* It is the first time this function is called in this thread,
|
||||
* we need to create a new thread-specific DNS resolver state. */
|
||||
rt = _res_thread_alloc();
|
||||
if (rt == NULL) {
|
||||
return NULL;
|
||||
}
|
||||
pthread_setspecific( _res_key, rt );
|
||||
D("%s: tid=%d Created new DNS state rt=%p",
|
||||
__FUNCTION__, gettid(), rt);
|
||||
|
||||
RESET_STATE:
|
||||
/* Reset the state, note that res_ninit() can now properly reset
|
||||
* an existing state without leaking memory.
|
||||
*/
|
||||
D("%s: tid=%d, rt=%p, resetting DNS state (options RES_INIT=%d)",
|
||||
__FUNCTION__, gettid(), rt, (rt->_nres->options & RES_INIT) != 0);
|
||||
if ( res_ninit( rt->_nres ) < 0 ) {
|
||||
/* This should not happen */
|
||||
D("%s: tid=%d rt=%p, woot, res_ninit() returned < 0",
|
||||
__FUNCTION__, gettid(), rt);
|
||||
_res_thread_free(rt);
|
||||
pthread_setspecific( _res_key, NULL );
|
||||
return NULL;
|
||||
}
|
||||
return rt;
|
||||
}
|
||||
|
||||
__LIBC_HIDDEN__
|
||||
struct __res_state _nres;
|
||||
|
||||
#if 0
|
||||
struct resolv_cache*
|
||||
__get_res_cache(void)
|
||||
{
|
||||
_res_thread* rt = _res_thread_get();
|
||||
|
||||
if (!rt)
|
||||
return NULL;
|
||||
|
||||
if (!rt->_cache) {
|
||||
rt->_cache = _resolv_cache_create();
|
||||
}
|
||||
return rt->_cache;
|
||||
}
|
||||
#endif
|
||||
|
||||
int*
|
||||
__get_h_errno(void)
|
||||
{
|
||||
_res_thread* rt = _res_thread_get();
|
||||
static int panic = NETDB_INTERNAL;
|
||||
|
||||
return rt ? &rt->_h_errno : &panic;
|
||||
}
|
||||
|
||||
res_state
|
||||
__res_get_state(void)
|
||||
{
|
||||
_res_thread* rt = _res_thread_get();
|
||||
|
||||
return rt ? rt->_nres : NULL;
|
||||
}
|
||||
|
||||
void
|
||||
__res_put_state(res_state res)
|
||||
{
|
||||
/* nothing to do */
|
||||
res=res;
|
||||
}
|
||||
|
||||
res_static
|
||||
__res_get_static(void)
|
||||
{
|
||||
_res_thread* rt = _res_thread_get();
|
||||
|
||||
return rt ? rt->_rstatic : NULL;
|
||||
}
|
||||
Reference in New Issue
Block a user