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 * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 *
25 * files/netmasks.c -- "files" backend for nsswitch "netmasks" database
26 */
27
28 #pragma ident "%Z%%M% %I% %E% SMI"
29
30 /*
31 * All routines necessary to deal with the file /etc/inet/netmasks. The file
32 * contains mappings from 32 bit network internet addresses to their
33 * corresponding 32 bit mask internet addresses. The addresses are in dotted
34 * internet address form.
35 */
36
37 #include "files_common.h"
38 #include <string.h>
39 #include <sys/types.h>
40 #include <sys/socket.h>
41 #include <net/if.h>
42 #include <netinet/in.h>
43 #include <arpa/inet.h>
44 #include <nss_dbdefs.h>
45 #include <ctype.h>
46
47 /*
48 * Validate 'files' netmasks entry. The comparison objects are in IPv4
49 * internet address format.
50 */
51 static int
check_addr(nss_XbyY_args_t * argp,const char * line,int linelen)52 check_addr(nss_XbyY_args_t *argp, const char *line, int linelen)
53 {
54 const char *limit, *linep, *addrstart;
55 int addrlen;
56 char addrbuf[NSS_LINELEN_NETMASKS];
57 struct in_addr lineaddr, argsaddr;
58
59 linep = line;
60 limit = line + linelen;
61
62 /* skip leading spaces */
63 while (linep < limit && isspace(*linep))
64 linep++;
65
66 addrstart = linep;
67 while (linep < limit && !isspace(*linep))
68 linep++;
69 if (linep == limit)
70 return (0);
71 addrlen = linep - addrstart;
72 if (addrlen < sizeof (addrbuf)) {
73 (void) memcpy(addrbuf, addrstart, addrlen);
74 addrbuf[addrlen] = '\0';
75 if ((lineaddr.s_addr = inet_addr(addrbuf)) ==
76 (in_addr_t)0xffffffffU)
77 return (0);
78 if ((argsaddr.s_addr = inet_addr(argp->key.name))
79 == (in_addr_t)0xffffffffU)
80 return (0);
81 return (lineaddr.s_addr == argsaddr.s_addr);
82 }
83 return (0);
84 }
85
86 static nss_status_t
getbynet(be,a)87 getbynet(be, a)
88 files_backend_ptr_t be;
89 void *a;
90 {
91 nss_XbyY_args_t *argp = (nss_XbyY_args_t *)a;
92 nss_status_t res;
93 char tmpbuf[NSS_LINELEN_NETMASKS];
94
95 /*
96 * use the buffer passed in if result is to be returned
97 * in /etc file format
98 */
99 if (argp->buf.result != NULL) {
100 argp->buf.buffer = tmpbuf;
101 argp->buf.buflen = NSS_LINELEN_NETMASKS;
102 }
103 res = _nss_files_XY_all(be, argp, 1, argp->key.name, check_addr);
104 if (argp->buf.result != NULL) {
105 argp->buf.buffer = NULL;
106 argp->buf.buflen = 0;
107 } else {
108 /* the frontend expects the netmask data only */
109 if (res == NSS_SUCCESS) {
110 char *m;
111 char *s = (char *)argp->returnval;
112 int l = 0;
113
114 m = s + argp->returnlen - 1;
115
116 /* skip trailing spaces */
117 while (s < m && isspace(*m))
118 m--;
119
120 for (; s <= m; m--) {
121 if (isspace(*m))
122 break;
123 l++;
124 }
125 m++;
126 (void) memmove(argp->returnval, m, l);
127 argp->returnlen = l;
128 *(s + l) = '\0';
129 }
130 }
131
132 return (res);
133 }
134
135 static files_backend_op_t netmasks_ops[] = {
136 _nss_files_destr,
137 getbynet
138 };
139
140 /*ARGSUSED*/
141 nss_backend_t *
_nss_files_netmasks_constr(dummy1,dummy2,dummy3)142 _nss_files_netmasks_constr(dummy1, dummy2, dummy3)
143 const char *dummy1, *dummy2, *dummy3;
144 {
145 return (_nss_files_constr(netmasks_ops,
146 sizeof (netmasks_ops) / sizeof (netmasks_ops[0]),
147 _PATH_NETMASKS, NSS_LINELEN_NETMASKS, NULL));
148 }
149