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 2006 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 *
25 * files/bootparams_getbyname.c -- "files" backend for
26 * nsswitch "bootparams" database.
27 */
28
29 static const char *bootparams = "/etc/bootparams";
30
31 #include "files_common.h"
32 #include <stdlib.h>
33 #include <ctype.h>
34 #include <strings.h>
35
36 static nss_status_t _nss_files_XY_bootparams(files_backend_ptr_t,
37 nss_XbyY_args_t *, const char *);
38
39 static nss_status_t
getbyname(be,a)40 getbyname(be, a)
41 files_backend_ptr_t be;
42 void *a;
43 {
44 nss_XbyY_args_t *argp = (nss_XbyY_args_t *)a;
45 nss_status_t res;
46
47 /* bootparams_getbyname() has not set/endent; rewind on each call */
48 if ((res = _nss_files_setent(be, 0)) != NSS_SUCCESS) {
49 return (res);
50 }
51 return (_nss_files_XY_bootparams(be, argp, argp->key.name));
52 }
53
54 static files_backend_op_t bootparams_ops[] = {
55 _nss_files_destr,
56 getbyname
57 };
58
59 /*ARGSUSED*/
60 nss_backend_t *
_nss_files_bootparams_constr(dummy1,dummy2,dummy3)61 _nss_files_bootparams_constr(dummy1, dummy2, dummy3)
62 const char *dummy1, *dummy2, *dummy3;
63 {
64 return (_nss_files_constr(bootparams_ops,
65 sizeof (bootparams_ops) / sizeof (bootparams_ops[0]),
66 bootparams,
67 NSS_LINELEN_BOOTPARAMS,
68 NULL));
69 }
70
71 /*
72 * bootparams has the hostname as part of the data in the file, but the other
73 * backends don't include it in the data passed to the backend. For this
74 * reason, we process everything here and don't bother calling the backend.
75 */
76 /*ARGSUSED*/
77 static nss_status_t
_nss_files_XY_bootparams(be,args,filter)78 _nss_files_XY_bootparams(be, args, filter)
79 files_backend_ptr_t be;
80 nss_XbyY_args_t *args;
81 const char *filter;
82 /*
83 * filter not useful here since the key
84 * we are looking for is the first "word"
85 * on the line and we can be fast enough.
86 */
87 {
88 nss_status_t res;
89
90 if (be->buf == 0 &&
91 (be->buf = (char *)malloc(be->minbuf)) == 0) {
92 (void) _nss_files_endent(be, 0);
93 return (NSS_UNAVAIL); /* really panic, malloc failed */
94 }
95
96 res = NSS_NOTFOUND;
97
98 /*CONSTCOND*/
99 while (1) {
100 char *instr = be->buf;
101 char *p, *host, *limit;
102 int linelen;
103
104 /*
105 * _nss_files_read_line does process the '\' that are used
106 * in /etc/bootparams for continuation and gives one long
107 * buffer.
108 *
109 * linelen counts the characters up to but excluding the '\n'
110 */
111 if ((linelen = _nss_files_read_line(be->f, instr,
112 be->minbuf)) < 0) {
113 /* End of file */
114 args->returnval = 0;
115 args->returnlen = 0;
116 break;
117 }
118
119 /*
120 * we need to strip off the host name before returning it.
121 */
122 p = instr;
123 limit = p + linelen;
124
125 /* Skip over leading whitespace */
126 while (p < limit && isspace(*p)) {
127 p++;
128 }
129 host = p;
130
131 /* Skip over the hostname */
132 while (p < limit && !isspace(*p)) {
133 p++;
134 }
135 *p++ = '\0';
136
137 if (strcasecmp(args->key.name, host) != 0) {
138 continue;
139 }
140
141 /* Skip over whitespace between name and first datum */
142 while (p < limit && isspace(*p)) {
143 p++;
144 }
145 if (p >= limit) {
146 /* Syntax error -- no data! Just skip it. */
147 continue;
148 }
149
150 linelen -= (p - instr);
151 if (args->buf.buflen <= linelen) { /* not enough buffer */
152 args->erange = 1;
153 break;
154 }
155 (void) memcpy(args->buf.buffer, p, linelen);
156 args->buf.buffer[linelen] = '\0';
157 args->returnval = args->buf.result;
158 args->returnlen = linelen;
159 res = NSS_SUCCESS;
160 break;
161 }
162 (void) _nss_files_endent(be, 0);
163 return (res);
164 }
165