usr/src/lib/libnsl/nss/gethostent_r.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22
  23 /*
  24  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  25  * Use is subject to license terms.
  26  */
  27
  28 /*
  29  * This file defines and implements the re-entrant enumeration routines for
  30  *   hosts: sethostent(), gethostent_r(), and endhostent(). They consult
  31  *   the switch policy directly and do not "share" their enumeration state
  32  *   nor the stayopen flag with the implentation of the more commonly used
  33  *   gethostbyname_r()/gethostbyaddr_r(). The latter follows a tortuous
  34  *   route in order to be consistent with netdir_getbyYY() (see
  35  *   gethostbyname_r.c and netdir_inet.c).
  36  */
  37
  38 #pragma ident   "%Z%%M% %I%     %E% SMI"
  39
  40 #include "mt.h"
  41 #include <sys/socket.h>
  42 #include <sys/types.h>
  43 #include <nss_dbdefs.h>
  44 #include "nss.h"
  45
  46 /*
  47  * str2hostent() is now a wrapper to __str2hostent().
  48  * __str2hostent() now takes an extra argument to specify the
  49  * AF_INET type for address parsing.
  50  */
  51 int
  52 str2hostent(const char *instr, int lenstr, void *ent, char *buffer, int buflen)
  53 {
  54         return (__str2hostent(AF_INET, instr, lenstr, ent, buffer, buflen));
  55 }
  56
  57 static int hosts_stayopen;
  58 /*
  59  * Unsynchronized, but it affects only
  60  * efficiency, not correctness
  61  */
  62
  63 static DEFINE_NSS_DB_ROOT(db_root);
  64 static DEFINE_NSS_GETENT(context);
  65
  66 void
  67 _nss_initf_hosts(nss_db_params_t *p)
  68 {
  69         p->name = NSS_DBNAM_HOSTS;
  70         p->default_config = NSS_DEFCONF_HOSTS;
  71 }
  72
  73 int
  74 sethostent(int stay)
  75 {
  76         hosts_stayopen |= stay;
  77         nss_setent(&db_root, _nss_initf_hosts, &context);
  78         return (0);
  79 }
  80
  81 int
  82 endhostent(void)
  83 {
  84         hosts_stayopen = 0;
  85         nss_endent(&db_root, _nss_initf_hosts, &context);
  86         nss_delete(&db_root);
  87         return (0);
  88 }
  89
  90 struct hostent *
  91 gethostent_r(struct hostent *result, char *buffer, int buflen, int *h_errnop)
  92 {
  93         nss_XbyY_args_t arg;
  94         nss_status_t    res;
  95
  96         NSS_XbyY_INIT(&arg, result, buffer, buflen, str2hostent);
  97         res = nss_getent(&db_root, _nss_initf_hosts,
  98             &context, &arg);
  99         arg.status = res;
 100         *h_errnop = arg.h_errno;
 101         return ((struct hostent *)NSS_XbyY_FINI(&arg));
 102 }