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
str2hostent(const char * instr,int lenstr,void * ent,char * buffer,int buflen)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
_nss_initf_hosts(nss_db_params_t * p)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
sethostent(int stay)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
endhostent(void)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 *
gethostent_r(struct hostent * result,char * buffer,int buflen,int * h_errnop)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 }
103