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