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 #pragma ident "%Z%%M% %I% %E% SMI"
31
32 #include "nis_common.h"
33 #include <synch.h>
34 #include <netdb.h>
35 #include <sys/socket.h>
36 #include <netinet/in.h>
37 #include <arpa/inet.h>
38 #include <string.h>
39
40 static int nettoa(int anet, char *buf, int buflen, char **pnull);
41
42 static nss_status_t
getbyname(be,a)43 getbyname(be, a)
44 nis_backend_ptr_t be;
45 void *a;
46 {
47 nss_XbyY_args_t *argp = (nss_XbyY_args_t *)a;
48
49 return (_nss_nis_lookup(be, argp, 1, "networks.byname",
50 argp->key.name, 0));
51 }
52
53 static nss_status_t
getbyaddr(be,a)54 getbyaddr(be, a)
55 nis_backend_ptr_t be;
56 void *a;
57 {
58 nss_XbyY_args_t *argp = (nss_XbyY_args_t *)a;
59 char addrstr[16];
60 char *pnull;
61 nss_status_t rc;
62
63 if (nettoa((int)argp->key.netaddr.net, addrstr, 16, &pnull) != 0)
64 return (NSS_UNAVAIL); /* it's really ENOMEM */
65 rc = _nss_nis_lookup(be, argp, 1, "networks.byaddr", addrstr, 0);
66
67 /*
68 * if not found, try again with the untruncated address string
69 * that has the trailing zero(s)
70 */
71 if (rc == NSS_NOTFOUND && pnull != NULL) {
72 *pnull = '.';
73 rc = _nss_nis_lookup(be, argp, 1, "networks.byaddr",
74 addrstr, 0);
75 }
76 return (rc);
77 }
78
79 static nis_backend_op_t net_ops[] = {
80 _nss_nis_destr,
81 _nss_nis_endent,
82 _nss_nis_setent,
83 _nss_nis_getent_netdb,
84 getbyname,
85 getbyaddr
86 };
87
88 /*ARGSUSED*/
89 nss_backend_t *
_nss_nis_networks_constr(dummy1,dummy2,dummy3)90 _nss_nis_networks_constr(dummy1, dummy2, dummy3)
91 const char *dummy1, *dummy2, *dummy3;
92 {
93 return (_nss_nis_constr(net_ops,
94 sizeof (net_ops) / sizeof (net_ops[0]),
95 "networks.byaddr"));
96 }
97
98 /*
99 * Takes an unsigned integer in host order, and returns a printable
100 * string for it as a network number. To allow for the possibility of
101 * naming subnets, only trailing dot-zeros are truncated. The location
102 * where the string is truncated (or set to '\0') is returned in *pnull.
103 */
104 static int
nettoa(int anet,char * buf,int buflen,char ** pnull)105 nettoa(int anet, char *buf, int buflen, char **pnull)
106 {
107 char *p;
108 struct in_addr in;
109 int addr;
110
111 *pnull = NULL;
112
113 if (buf == 0)
114 return (1);
115 in = inet_makeaddr(anet, INADDR_ANY);
116 addr = in.s_addr;
117 (void) strncpy(buf, inet_ntoa(in), buflen);
118 if ((IN_CLASSA_HOST & htonl(addr)) == 0) {
119 p = strchr(buf, '.');
120 if (p == NULL)
121 return (1);
122 *p = 0;
123 *pnull = p;
124 } else if ((IN_CLASSB_HOST & htonl(addr)) == 0) {
125 p = strchr(buf, '.');
126 if (p == NULL)
127 return (1);
128 p = strchr(p+1, '.');
129 if (p == NULL)
130 return (1);
131 *p = 0;
132 *pnull = p;
133 } else if ((IN_CLASSC_HOST & htonl(addr)) == 0) {
134 p = strrchr(buf, '.');
135 if (p == NULL)
136 return (1);
137 *p = 0;
138 *pnull = p;
139 }
140 return (0);
141 }
142