contrib/bind-9.5.2/lib/bind/irs/irs_data.c

   1 /*
   2  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (c) 1996,1999 by Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  15  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 #if !defined(LINT) && !defined(CODECENTER)
  19 static const char rcsid[] = "$Id: irs_data.c,v 1.12 2007/08/27 03:32:26 marka Exp $";
  20 #endif
  21
  22 #include "port_before.h"
  23
  24 #ifndef __BIND_NOSTATIC
  25
  26 #include <sys/types.h>
  27
  28 #include <netinet/in.h>
  29 #include <arpa/nameser.h>
  30
  31 #include <resolv.h>
  32 #include <stdio.h>
  33 #include <string.h>
  34 #include <isc/memcluster.h>
  35
  36 #ifdef DO_PTHREADS
  37 #include <pthread.h>
  38 #endif
  39
  40 #include <irs.h>
  41 #include <stdlib.h>
  42
  43 #include "port_after.h"
  44
  45 #include "irs_data.h"
  46 #undef _res
  47 #if !(__GLIBC__ > 2 || __GLIBC__ == 2 &&  __GLIBC_MINOR__ >= 3)
  48 #undef h_errno
  49 extern int h_errno;
  50 #endif
  51
  52 extern struct __res_state _res;
  53
  54 #ifdef  DO_PTHREADS
  55 static pthread_key_t    key;
  56 static int              once = 0;
  57 #else
  58 static struct net_data  *net_data;
  59 #endif
  60
  61 void
  62 irs_destroy(void) {
  63 #ifndef DO_PTHREADS
  64         if (net_data != NULL)
  65                 net_data_destroy(net_data);
  66         net_data = NULL;
  67 #endif
  68 }
  69
  70 void
  71 net_data_destroy(void *p) {
  72         struct net_data *net_data = p;
  73
  74         res_ndestroy(net_data->res);
  75         if (net_data->gr != NULL) {
  76                 (*net_data->gr->close)(net_data->gr);
  77                 net_data->gr = NULL;
  78         }
  79         if (net_data->pw != NULL) {
  80                 (*net_data->pw->close)(net_data->pw);
  81                 net_data->pw = NULL;
  82         }
  83         if (net_data->sv != NULL) {
  84                 (*net_data->sv->close)(net_data->sv);
  85                 net_data->sv = NULL;
  86         }
  87         if (net_data->pr != NULL) {
  88                 (*net_data->pr->close)(net_data->pr);
  89                 net_data->pr = NULL;
  90         }
  91         if (net_data->ho != NULL) {
  92                 (*net_data->ho->close)(net_data->ho);
  93                 net_data->ho = NULL;
  94         }
  95         if (net_data->nw != NULL) {
  96                 (*net_data->nw->close)(net_data->nw);
  97                 net_data->nw = NULL;
  98         }
  99         if (net_data->ng != NULL) {
 100                 (*net_data->ng->close)(net_data->ng);
 101                 net_data->ng = NULL;
 102         }
 103         if (net_data->ho_data != NULL) {
 104                 free(net_data->ho_data);
 105                 net_data->ho_data = NULL;
 106         }
 107         if (net_data->nw_data != NULL) {
 108                 free(net_data->nw_data);
 109                 net_data->nw_data = NULL;
 110         }
 111
 112         (*net_data->irs->close)(net_data->irs);
 113         memput(net_data, sizeof *net_data);
 114 }
 115
 116 /*%
 117  *  applications that need a specific config file other than
 118  * _PATH_IRS_CONF should call net_data_init directly rather than letting
 119  *   the various wrapper functions make the first call. - brister
 120  */
 121
 122 struct net_data *
 123 net_data_init(const char *conf_file) {
 124 #ifdef  DO_PTHREADS
 125 #ifndef LIBBIND_MUTEX_INITIALIZER
 126 #define LIBBIND_MUTEX_INITIALIZER PTHREAD_MUTEX_INITIALIZER
 127 #endif
 128         static pthread_mutex_t keylock = LIBBIND_MUTEX_INITIALIZER;
 129         struct net_data *net_data;
 130
 131         if (!once) {
 132                 if (pthread_mutex_lock(&keylock) != 0)
 133                         return (NULL);
 134                 if (!once) {
 135                         if (pthread_key_create(&key, net_data_destroy) != 0) {
 136                                 (void)pthread_mutex_unlock(&keylock);
 137                                 return (NULL);
 138                         }
 139                         once = 1;
 140                 }
 141                 if (pthread_mutex_unlock(&keylock) != 0)
 142                         return (NULL);
 143         }
 144         net_data = pthread_getspecific(key);
 145 #endif
 146
 147         if (net_data == NULL) {
 148                 net_data = net_data_create(conf_file);
 149                 if (net_data == NULL)
 150                         return (NULL);
 151 #ifdef  DO_PTHREADS
 152                 if (pthread_setspecific(key, net_data) != 0) {
 153                         net_data_destroy(net_data);
 154                         return (NULL);
 155                 }
 156 #endif
 157         }
 158
 159         return (net_data);
 160 }
 161
 162 struct net_data *
 163 net_data_create(const char *conf_file) {
 164         struct net_data *net_data;
 165
 166         net_data = memget(sizeof (struct net_data));
 167         if (net_data == NULL)
 168                 return (NULL);
 169         memset(net_data, 0, sizeof (struct net_data));
 170
 171         if ((net_data->irs = irs_gen_acc("", conf_file)) == NULL) {
 172                 memput(net_data, sizeof (struct net_data));
 173                 return (NULL);
 174         }
 175 #ifndef DO_PTHREADS
 176         (*net_data->irs->res_set)(net_data->irs, &_res, NULL);
 177 #endif
 178
 179         net_data->res = (*net_data->irs->res_get)(net_data->irs);
 180         if (net_data->res == NULL) {
 181                 (*net_data->irs->close)(net_data->irs);
 182                 memput(net_data, sizeof (struct net_data));
 183                 return (NULL);
 184         }
 185
 186         if ((net_data->res->options & RES_INIT) == 0U &&
 187             res_ninit(net_data->res) == -1) {
 188                 (*net_data->irs->close)(net_data->irs);
 189                 memput(net_data, sizeof (struct net_data));
 190                 return (NULL);
 191         }
 192
 193         return (net_data);
 194 }
 195
 196 void
 197 net_data_minimize(struct net_data *net_data) {
 198         res_nclose(net_data->res);
 199 }
 200
 201 #ifdef _REENTRANT
 202 struct __res_state *
 203 __res_state(void) {
 204         /* NULL param here means use the default config file. */
 205         struct net_data *net_data = net_data_init(NULL);
 206         if (net_data && net_data->res)
 207                 return (net_data->res);
 208
 209         return (&_res);
 210 }
 211 #else
 212 #ifdef __linux
 213 struct __res_state *
 214 __res_state(void) {
 215         return (&_res);
 216 }
 217 #endif
 218 #endif
 219
 220 int *
 221 __h_errno(void) {
 222         /* NULL param here means use the default config file. */
 223         struct net_data *net_data = net_data_init(NULL);
 224         if (net_data && net_data->res)
 225                 return (&net_data->res->res_h_errno);
 226 #if !(__GLIBC__ > 2 || __GLIBC__ == 2 &&  __GLIBC_MINOR__ >= 3)
 227         return(&_res.res_h_errno);
 228 #else
 229         return (&h_errno);
 230 #endif
 231 }
 232
 233 void
 234 __h_errno_set(struct __res_state *res, int err) {
 235
 236
 237 #if (__GLIBC__ > 2 || __GLIBC__ == 2 &&  __GLIBC_MINOR__ >= 3)
 238         res->res_h_errno = err;
 239 #else
 240         h_errno = res->res_h_errno = err;
 241 #endif
 242 }
 243
 244 #endif /*__BIND_NOSTATIC*/
 245
 246 /*! \file */