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
getbyname(be,a)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
getbyaddr(be,a)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 *
_nss_nis_networks_constr(dummy1,dummy2,dummy3)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
nettoa(int anet,char * buf,int buflen,char ** pnull)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