contrib/bind-9.2.4rc7/lib/bind/irs/lcl.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: lcl.c,v 1.1.2.2 2004/03/17 00:40:13 marka Exp $";
  20 #endif
  21
  22 /* Imports */
  23
  24 #include "port_before.h"
  25
  26 #include <stdlib.h>
  27 #include <errno.h>
  28 #include <string.h>
  29
  30 #include <sys/types.h>
  31 #include <netinet/in.h>
  32 #include <arpa/nameser.h>
  33 #include <resolv.h>
  34
  35 #include <isc/memcluster.h>
  36
  37 #include <irs.h>
  38
  39 #include "port_after.h"
  40
  41 #include "irs_p.h"
  42 #include "lcl_p.h"
  43
  44 /* Forward. */
  45
  46 static void             lcl_close(struct irs_acc *);
  47 static struct __res_state *     lcl_res_get(struct irs_acc *);
  48 static void             lcl_res_set(struct irs_acc *, struct __res_state *,
  49                                 void (*)(void *));
  50
  51 /* Public */
  52
  53 struct irs_acc *
  54 irs_lcl_acc(const char *options) {
  55         struct irs_acc *acc;
  56         struct lcl_p *lcl;
  57
  58         UNUSED(options);
  59
  60         if (!(acc = memget(sizeof *acc))) {
  61                 errno = ENOMEM;
  62                 return (NULL);
  63         }
  64         memset(acc, 0x5e, sizeof *acc);
  65         if (!(lcl = memget(sizeof *lcl))) {
  66                 errno = ENOMEM;
  67                 free(acc);
  68                 return (NULL);
  69         }
  70         memset(lcl, 0x5e, sizeof *lcl);
  71         lcl->res = NULL;
  72         lcl->free_res = NULL;
  73         acc->private = lcl;
  74 #ifdef WANT_IRS_GR
  75         acc->gr_map = irs_lcl_gr;
  76 #else
  77         acc->gr_map = NULL;
  78 #endif
  79 #ifdef WANT_IRS_PW
  80         acc->pw_map = irs_lcl_pw;
  81 #else
  82         acc->pw_map = NULL;
  83 #endif
  84         acc->sv_map = irs_lcl_sv;
  85         acc->pr_map = irs_lcl_pr;
  86         acc->ho_map = irs_lcl_ho;
  87         acc->nw_map = irs_lcl_nw;
  88         acc->ng_map = irs_lcl_ng;
  89         acc->res_get = lcl_res_get;
  90         acc->res_set = lcl_res_set;
  91         acc->close = lcl_close;
  92         return (acc);
  93 }
  94
  95 /* Methods */
  96 static struct __res_state *
  97 lcl_res_get(struct irs_acc *this) {
  98         struct lcl_p *lcl = (struct lcl_p *)this->private;
  99
 100         if (lcl->res == NULL) {
 101                 struct __res_state *res;
 102                 res = (struct __res_state *)malloc(sizeof *res);
 103                 if (res == NULL)
 104                         return (NULL);
 105                 memset(res, 0, sizeof *res);
 106                 lcl_res_set(this, res, free);
 107         }
 108
 109         if ((lcl->res->options & RES_INIT) == 0U &&
 110             res_ninit(lcl->res) < 0)
 111                 return (NULL);
 112
 113         return (lcl->res);
 114 }
 115
 116 static void
 117 lcl_res_set(struct irs_acc *this, struct __res_state *res,
 118                 void (*free_res)(void *)) {
 119         struct lcl_p *lcl = (struct lcl_p *)this->private;
 120
 121         if (lcl->res && lcl->free_res) {
 122                 res_nclose(lcl->res);
 123                 (*lcl->free_res)(lcl->res);
 124         }
 125
 126         lcl->res = res;
 127         lcl->free_res = free_res;
 128 }
 129
 130 static void
 131 lcl_close(struct irs_acc *this) {
 132         struct lcl_p *lcl = (struct lcl_p *)this->private;
 133
 134         if (lcl) {
 135                 if (lcl->free_res)
 136                         (*lcl->free_res)(lcl->res);
 137                 memput(lcl, sizeof *lcl);
 138         }
 139         memput(this, sizeof *this);
 140 }