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 (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 
22 /*
23  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 #pragma ident	"%Z%%M%	%I%	%E% SMI"
28 
29 #include "mdns_common.h"
30 
31 /*
32  * gethostby* functions for the hosts database. The hosts
33  * database stores IPv4 addresses only.
34  * mDNS query functions to perform the host lookup
35  * are in mdns/common/mdns_common.c file.
36  * _nss_mdns_hosts_constr is called to initialize
37  * the nsswitch backend data structures.
38  */
39 
40 static nss_status_t
getbyname(be,a)41 getbyname(be, a)
42 	mdns_backend_ptr_t	be;
43 	void			*a;
44 {
45 	struct mdns_querydata   qdata;
46 	char			*hname;
47 
48 	(void) memset(&qdata, 0, sizeof (struct mdns_querydata));
49 
50 	qdata.argp = (nss_XbyY_args_t *)a;
51 	hname = (char *)qdata.argp->key.name;
52 
53 	_nss_mdns_updatecfg(be);
54 	return (_nss_mdns_querybyname(be, hname, AF_INET, &qdata));
55 }
56 
57 /*ARGSUSED*/
58 static nss_status_t
getbyaddr(be,a)59 getbyaddr(be, a)
60 	mdns_backend_ptr_t	be;
61 	void			*a;
62 {
63 	nss_XbyY_args_t *argp = (nss_XbyY_args_t *)a;
64 	struct in_addr addr;
65 	struct mdns_querydata  qdata;
66 	char buffer[sizeof ("255.255.255.255.in-addr.arpa.")];
67 	uint8_t *p;
68 
69 	(void) memset(&qdata, 0, sizeof (struct mdns_querydata));
70 	qdata.argp = argp;
71 
72 	argp->h_errno = 0;
73 	if ((argp->key.hostaddr.type != AF_INET) ||
74 	    (argp->key.hostaddr.len != sizeof (addr)))
75 		return (NSS_NOTFOUND);
76 
77 	(void) memcpy(&addr, argp->key.hostaddr.addr, sizeof (addr));
78 
79 	if (inet_ntop(AF_INET, (void *) &addr.s_addr,
80 		(void *)qdata.paddrbuf,
81 		sizeof (qdata.paddrbuf)) == NULL)
82 			return (NSS_NOTFOUND);
83 
84 	qdata.af = AF_INET;
85 	p = (uint8_t *)&addr.s_addr;
86 	(void) snprintf(buffer, sizeof (buffer),
87 		"%u.%u.%u.%u.in-addr.arpa.", p[3], p[2], p[1], p[0]);
88 
89 	_nss_mdns_updatecfg(be);
90 	return (_nss_mdns_querybyaddr(be, buffer, qdata.af, &qdata));
91 }
92 
93 /*ARGSUSED*/
94 static nss_status_t
_nss_mdns_getent(be,args)95 _nss_mdns_getent(be, args)
96 	mdns_backend_ptr_t	be;
97 	void			*args;
98 {
99 	return (NSS_UNAVAIL);
100 }
101 
102 /*ARGSUSED*/
103 static nss_status_t
_nss_mdns_setent(be,dummy)104 _nss_mdns_setent(be, dummy)
105 	mdns_backend_ptr_t	be;
106 	void			*dummy;
107 {
108 	return (NSS_UNAVAIL);
109 }
110 
111 /*ARGSUSED*/
112 static nss_status_t
_nss_mdns_endent(be,dummy)113 _nss_mdns_endent(be, dummy)
114 	mdns_backend_ptr_t	be;
115 	void			*dummy;
116 {
117 	return (NSS_UNAVAIL);
118 }
119 
120 /*ARGSUSED*/
121 static nss_status_t
_nss_mdns_hosts_destr(be,dummy)122 _nss_mdns_hosts_destr(be, dummy)
123 	mdns_backend_ptr_t	be;
124 	void			*dummy;
125 {
126 	_nss_mdns_destr(be);
127 	return (NSS_SUCCESS);
128 }
129 
130 static mdns_backend_op_t host_ops[] = {
131 	_nss_mdns_hosts_destr,
132 	_nss_mdns_endent,
133 	_nss_mdns_setent,
134 	_nss_mdns_getent,
135 	getbyname,
136 	getbyaddr,
137 };
138 
139 /*ARGSUSED*/
140 nss_backend_t *
_nss_mdns_hosts_constr(dummy1,dummy2,dummy3)141 _nss_mdns_hosts_constr(dummy1, dummy2, dummy3)
142 	const char	*dummy1, *dummy2, *dummy3;
143 {
144 	return (_nss_mdns_constr(host_ops,
145 		sizeof (host_ops) / sizeof (host_ops[0])));
146 }
147 
148 /*ARGSUSED*/
149 nss_status_t
_nss_get_mdns_hosts_name(mdns_backend_ptr_t * be,void ** bufp,size_t * sizep)150 _nss_get_mdns_hosts_name(mdns_backend_ptr_t *be, void **bufp, size_t *sizep)
151 {
152 	return (_nss_mdns_gethost_withttl(*bufp, *sizep, 0));
153 }
154