contrib/bind-9.2.4rc7/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 1.3.2.4 2004/03/17 00:40:13 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 /* applications that need a specific config file other than
 117  * _PATH_IRS_CONF should call net_data_init directly rather than letting
 118  *   the various wrapper functions make the first call. - brister
 119  */
 120
 121 struct net_data *
 122 net_data_init(const char *conf_file) {
 123 #ifdef  DO_PTHREADS
 124         static pthread_mutex_t keylock = PTHREAD_MUTEX_INITIALIZER;
 125         struct net_data *net_data;
 126
 127         if (!once) {
 128                 pthread_mutex_lock(&keylock);
 129                 if (!once++)
 130                         pthread_key_create(&key, net_data_destroy);
 131                 pthread_mutex_unlock(&keylock);
 132         }
 133         net_data = pthread_getspecific(key);
 134 #endif
 135
 136         if (net_data == NULL) {
 137                 net_data = net_data_create(conf_file);
 138                 if (net_data == NULL)
 139                         return (NULL);
 140 #ifdef  DO_PTHREADS
 141                 pthread_setspecific(key, net_data);
 142 #endif
 143         }
 144
 145         return (net_data);
 146 }
 147
 148 struct net_data *
 149 net_data_create(const char *conf_file) {
 150         struct net_data *net_data;
 151
 152         net_data = memget(sizeof (struct net_data));
 153         if (net_data == NULL)
 154                 return (NULL);
 155         memset(net_data, 0, sizeof (struct net_data));
 156
 157         if ((net_data->irs = irs_gen_acc("", conf_file)) == NULL) {
 158                 memput(net_data, sizeof (struct net_data));
 159                 return (NULL);
 160         }
 161 #ifndef DO_PTHREADS
 162         (*net_data->irs->res_set)(net_data->irs, &_res, NULL);
 163 #endif
 164
 165         net_data->res = (*net_data->irs->res_get)(net_data->irs);
 166         if (net_data->res == NULL) {
 167                 (*net_data->irs->close)(net_data->irs);
 168                 memput(net_data, sizeof (struct net_data));
 169                 return (NULL);
 170         }
 171
 172         if ((net_data->res->options & RES_INIT) == 0U &&
 173             res_ninit(net_data->res) == -1) {
 174                 (*net_data->irs->close)(net_data->irs);
 175                 memput(net_data, sizeof (struct net_data));
 176                 return (NULL);
 177         }
 178
 179         return (net_data);
 180 }
 181
 182 void
 183 net_data_minimize(struct net_data *net_data) {
 184         res_nclose(net_data->res);
 185 }
 186
 187 #ifdef _REENTRANT
 188 struct __res_state *
 189 __res_state(void) {
 190         /* NULL param here means use the default config file. */
 191         struct net_data *net_data = net_data_init(NULL);
 192         if (net_data && net_data->res)
 193                 return (net_data->res);
 194
 195         return (&_res);
 196 }
 197 #else
 198 #ifdef __linux
 199 struct __res_state *
 200 __res_state(void) {
 201         return (&_res);
 202 }
 203 #endif
 204 #endif
 205
 206 int *
 207 __h_errno(void) {
 208         /* NULL param here means use the default config file. */
 209         struct net_data *net_data = net_data_init(NULL);
 210         if (net_data && net_data->res)
 211                 return (&net_data->res->res_h_errno);
 212 #if !(__GLIBC__ > 2 || __GLIBC__ == 2 &&  __GLIBC_MINOR__ >= 3)
 213         return(&_res.res_h_errno);
 214 #else
 215         return (&h_errno);
 216 #endif
 217 }
 218
 219 void
 220 __h_errno_set(struct __res_state *res, int err) {
 221
 222
 223 #if (__GLIBC__ > 2 || __GLIBC__ == 2 &&  __GLIBC_MINOR__ >= 3)
 224         res->res_h_errno = err;
 225 #else
 226         h_errno = res->res_h_errno = err;
 227 #endif
 228 }
 229
 230 #endif /*__BIND_NOSTATIC*/