xref: /illumos-gate/usr/src/lib/nsswitch/nis/common/getnetent.c (revision b41e2fb6b2658a36accc73b3b86d99375e700dba)
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  *	nis/getnetent.c -- "nis" backend for nsswitch "networks" database
28  */
29 
30 #include "nis_common.h"
31 #include <synch.h>
32 #include <netdb.h>
33 #include <sys/socket.h>
34 #include <netinet/in.h>
35 #include <arpa/inet.h>
36 #include <string.h>
37 
38 static int nettoa(int anet, char *buf, int buflen, char **pnull);
39 
40 static nss_status_t
41 getbyname(be, a)
42 	nis_backend_ptr_t	be;
43 	void			*a;
44 {
45 	nss_XbyY_args_t		*argp = (nss_XbyY_args_t *)a;
46 
47 	return (_nss_nis_lookup(be, argp, 1, "networks.byname",
48 		argp->key.name, 0));
49 }
50 
51 static nss_status_t
52 getbyaddr(be, a)
53 	nis_backend_ptr_t	be;
54 	void			*a;
55 {
56 	nss_XbyY_args_t		*argp = (nss_XbyY_args_t *)a;
57 	char			addrstr[16];
58 	char			*pnull;
59 	nss_status_t		rc;
60 
61 	if (nettoa((int)argp->key.netaddr.net, addrstr, 16, &pnull) != 0)
62 		return (NSS_UNAVAIL);	/* it's really ENOMEM */
63 	rc = _nss_nis_lookup(be, argp, 1, "networks.byaddr", addrstr, 0);
64 
65 	/*
66 	 * if not found, try again with the untruncated address string
67 	 * that has the trailing zero(s)
68 	 */
69 	if (rc == NSS_NOTFOUND && pnull != NULL) {
70 		*pnull = '.';
71 		rc = _nss_nis_lookup(be, argp, 1, "networks.byaddr",
72 			addrstr, 0);
73 	}
74 	return (rc);
75 }
76 
77 static nis_backend_op_t net_ops[] = {
78 	_nss_nis_destr,
79 	_nss_nis_endent,
80 	_nss_nis_setent,
81 	_nss_nis_getent_netdb,
82 	getbyname,
83 	getbyaddr
84 };
85 
86 /*ARGSUSED*/
87 nss_backend_t *
88 _nss_nis_networks_constr(dummy1, dummy2, dummy3)
89 	const char	*dummy1, *dummy2, *dummy3;
90 {
91 	return (_nss_nis_constr(net_ops,
92 				sizeof (net_ops) / sizeof (net_ops[0]),
93 				"networks.byaddr"));
94 }
95 
96 /*
97  * Takes an unsigned integer in host order, and returns a printable
98  * string for it as a network number.  To allow for the possibility of
99  * naming subnets, only trailing dot-zeros are truncated. The location
100  * where the string is truncated (or set to '\0') is returned in *pnull.
101  */
102 static int
103 nettoa(int anet, char *buf, int buflen, char **pnull)
104 {
105 	char *p;
106 	struct in_addr in;
107 	int addr;
108 
109 	*pnull = NULL;
110 
111 	if (buf == 0)
112 		return (1);
113 	in = inet_makeaddr(anet, INADDR_ANY);
114 	addr = in.s_addr;
115 	(void) strncpy(buf, inet_ntoa(in), buflen);
116 	if ((IN_CLASSA_HOST & htonl(addr)) == 0) {
117 		p = strchr(buf, '.');
118 		if (p == NULL)
119 			return (1);
120 		*p = 0;
121 		*pnull = p;
122 	} else if ((IN_CLASSB_HOST & htonl(addr)) == 0) {
123 		p = strchr(buf, '.');
124 		if (p == NULL)
125 			return (1);
126 		p = strchr(p+1, '.');
127 		if (p == NULL)
128 			return (1);
129 		*p = 0;
130 		*pnull = p;
131 	} else if ((IN_CLASSC_HOST & htonl(addr)) == 0) {
132 		p = strrchr(buf, '.');
133 		if (p == NULL)
134 			return (1);
135 		*p = 0;
136 		*pnull = p;
137 	}
138 	return (0);
139 }
140