186 lines
4.7 KiB
C
186 lines
4.7 KiB
C
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/*
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* Copyright (C) 2008 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#include <arpa/inet.h>
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#include "arpa_nameser.h"
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#include <netdb.h>
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#include "resolv_private.h"
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#include "resolv_cache.h"
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#include <pthread.h>
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#include <stdlib.h>
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#define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_
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#include <sys/_system_properties.h>
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static pthread_key_t _res_key;
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static pthread_once_t _res_once;
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typedef struct {
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int _h_errno;
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struct __res_state _nres[1];
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unsigned _serial;
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struct prop_info* _pi;
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struct res_static _rstatic[1];
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} _res_thread;
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static _res_thread*
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_res_thread_alloc(void)
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{
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_res_thread* rt = malloc(sizeof(*rt));
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if (rt) {
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rt->_h_errno = 0;
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/* Special system property which tracks any changes to 'net.*'. */
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rt->_serial = 0;
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rt->_pi = (struct prop_info*) __system_property_find("net.change");
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if (rt->_pi) {
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rt->_serial = rt->_pi->serial;
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}
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if ( res_ninit( rt->_nres ) < 0 ) {
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free(rt);
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rt = NULL;
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} else {
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memset(rt->_rstatic, 0, sizeof rt->_rstatic);
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}
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}
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return rt;
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}
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static void
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_res_static_done( res_static rs )
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{
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/* fortunately, there is nothing to do here, since the
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* points in h_addr_ptrs and host_aliases should all
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* point to 'hostbuf'
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*/
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if (rs->hostf) { /* should not happen in theory, but just be safe */
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fclose(rs->hostf);
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rs->hostf = NULL;
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}
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free(rs->servent.s_aliases);
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}
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static void
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_res_thread_free( void* _rt )
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{
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_res_thread* rt = _rt;
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_res_static_done(rt->_rstatic);
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res_ndestroy(rt->_nres);
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free(rt);
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}
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static void
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_res_init_key( void )
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{
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pthread_key_create( &_res_key, _res_thread_free );
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}
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static _res_thread*
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_res_thread_get(void)
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{
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_res_thread* rt;
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pthread_once( &_res_once, _res_init_key );
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rt = pthread_getspecific( _res_key );
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if (rt == NULL) {
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if ((rt = _res_thread_alloc()) == NULL) {
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return NULL;
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}
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rt->_h_errno = 0;
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rt->_serial = 0;
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pthread_setspecific( _res_key, rt );
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}
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/* Check the serial value for any chanes to net.* properties. */
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if (rt->_pi == NULL) {
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rt->_pi = (struct prop_info*) __system_property_find("net.change");
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}
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if (rt->_pi == NULL || rt->_serial == rt->_pi->serial) {
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return rt;
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}
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rt->_serial = rt->_pi->serial;
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/* Reload from system properties. */
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if ( res_ninit( rt->_nres ) < 0 ) {
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free(rt);
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rt = NULL;
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pthread_setspecific( _res_key, rt );
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}
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_resolv_cache_reset(rt->_serial);
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return rt;
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}
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struct __res_state _nres;
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#if 0
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struct resolv_cache*
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__get_res_cache(void)
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{
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_res_thread* rt = _res_thread_get();
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if (!rt)
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return NULL;
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if (!rt->_cache) {
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rt->_cache = _resolv_cache_create();
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}
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return rt->_cache;
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}
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#endif
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int*
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__get_h_errno(void)
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{
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_res_thread* rt = _res_thread_get();
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static int panic = NETDB_INTERNAL;
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return rt ? &rt->_h_errno : &panic;
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}
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res_state
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__res_get_state(void)
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{
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_res_thread* rt = _res_thread_get();
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return rt ? rt->_nres : NULL;
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}
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void
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__res_put_state(res_state res)
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{
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/* nothing to do */
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res=res;
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}
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res_static
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__res_get_static(void)
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{
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_res_thread* rt = _res_thread_get();
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return rt ? rt->_rstatic : NULL;
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}
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