usr/src/lib/libc/port/nsl/gethostent6.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  *   IPv6 hosts: sethostent6(), gethostent6(), and endhostent6().
  31  *   They consult the switch policy directly and do not "share" their
  32  *   enumeration state nor the stayopen flag with the implentation of the
  33  *   more commonly used getipnodebyname()/getipnodebyaddr(). The latter
  34  *   follows a tortuous route in order to be consistent with netdir_getbyYY()
  35  *   (see getipnodebyname.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 static int ipnodes_stayopen;
  47 /*
  48  * Unsynchronized, but it affects only
  49  * efficiency, not correctness
  50  */
  51
  52 static DEFINE_NSS_DB_ROOT(db_root);
  53 static DEFINE_NSS_GETENT(context);
  54
  55 /* IPv6 wrapper for __str2hostent() */
  56 int
  57 str2hostent6(const char *instr, int lenstr, void *ent, char *buffer, int buflen)
  58 {
  59         return (__str2hostent(AF_INET6, instr, lenstr, ent, buffer, buflen));
  60 }
  61
  62 void
  63 _nss_initf_ipnodes(nss_db_params_t *p)
  64 {
  65         p->name = NSS_DBNAM_IPNODES;
  66         p->default_config = NSS_DEFCONF_IPNODES;
  67 }
  68
  69 int
  70 __sethostent6(int stay)
  71 {
  72         ipnodes_stayopen |= stay;
  73         nss_setent(&db_root, _nss_initf_ipnodes, &context);
  74         return (0);
  75 }
  76
  77 int
  78 __endhostent6(void)
  79 {
  80         ipnodes_stayopen = 0;
  81         nss_endent(&db_root, _nss_initf_ipnodes, &context);
  82         nss_delete(&db_root);
  83         return (0);
  84 }
  85
  86 struct hostent *
  87 __gethostent6(struct hostent *result, char *buffer, int buflen, int *h_errnop)
  88 {
  89         nss_XbyY_args_t arg;
  90         nss_status_t    res;
  91
  92         NSS_XbyY_INIT(&arg, result, buffer, buflen, str2hostent6);
  93         res = nss_getent(&db_root, _nss_initf_ipnodes,
  94             &context, &arg);
  95         arg.status = res;
  96         *h_errnop = arg.h_errno;
  97         return ((struct hostent *)NSS_XbyY_FINI(&arg));
  98 }