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#pragma ident	"%Z%%M%	%I%	%E% SMI"
30
31static const char *bootparams = "/etc/bootparams";
32
33#include "files_common.h"
34#include <stdlib.h>
35#include <ctype.h>
36#include <strings.h>
37
38static nss_status_t _nss_files_XY_bootparams(files_backend_ptr_t,
39	nss_XbyY_args_t *, const char *);
40
41static nss_status_t
42getbyname(be, a)
43	files_backend_ptr_t	be;
44	void			*a;
45{
46	nss_XbyY_args_t		*argp = (nss_XbyY_args_t *)a;
47	nss_status_t		res;
48
49	/* bootparams_getbyname() has not set/endent; rewind on each call */
50	if ((res = _nss_files_setent(be, 0)) != NSS_SUCCESS) {
51		return (res);
52	}
53	return (_nss_files_XY_bootparams(be, argp, argp->key.name));
54}
55
56static files_backend_op_t bootparams_ops[] = {
57	_nss_files_destr,
58	getbyname
59};
60
61/*ARGSUSED*/
62nss_backend_t *
63_nss_files_bootparams_constr(dummy1, dummy2, dummy3)
64	const char	*dummy1, *dummy2, *dummy3;
65{
66	return (_nss_files_constr(bootparams_ops,
67		sizeof (bootparams_ops) / sizeof (bootparams_ops[0]),
68		bootparams,
69		NSS_LINELEN_BOOTPARAMS,
70		NULL));
71}
72
73/*
74 * bootparams has the hostname as part of the data in the file, but the other
75 * backends don't include it in the data passed to the backend.  For this
76 * reason, we process everything here and don't bother calling the backend.
77 */
78/*ARGSUSED*/
79static nss_status_t
80_nss_files_XY_bootparams(be, args, filter)
81	files_backend_ptr_t	be;
82	nss_XbyY_args_t		*args;
83	const char		*filter;
84			/*
85			 * filter not useful here since the key
86			 * we are looking for is the first "word"
87			 * on the line and we can be fast enough.
88			 */
89{
90	nss_status_t		res;
91
92	if (be->buf == 0 &&
93		(be->buf = (char *)malloc(be->minbuf)) == 0) {
94		(void) _nss_files_endent(be, 0);
95		return (NSS_UNAVAIL); /* really panic, malloc failed */
96	}
97
98	res = NSS_NOTFOUND;
99
100	/*CONSTCOND*/
101	while (1) {
102		char		*instr	= be->buf;
103		char		*p, *host, *limit;
104		int		linelen;
105
106		/*
107		 * _nss_files_read_line does process the '\' that are used
108		 * in /etc/bootparams for continuation and gives one long
109		 * buffer.
110		 *
111		 * linelen counts the characters up to but excluding the '\n'
112		 */
113		if ((linelen = _nss_files_read_line(be->f, instr,
114		    be->minbuf)) < 0) {
115			/* End of file */
116			args->returnval = 0;
117			args->returnlen = 0;
118			break;
119		}
120
121		/*
122		 * we need to strip off the host name before returning it.
123		 */
124		p = instr;
125		limit = p + linelen;
126
127		/* Skip over leading whitespace */
128		while (p < limit && isspace(*p)) {
129			p++;
130		}
131		host = p;
132
133		/* Skip over the hostname */
134		while (p < limit && !isspace(*p)) {
135			p++;
136		}
137		*p++ = '\0';
138
139		if (strcasecmp(args->key.name, host) != 0) {
140			continue;
141		}
142
143		/* Skip over whitespace between name and first datum */
144		while (p < limit && isspace(*p)) {
145			p++;
146		}
147		if (p >= limit) {
148			/* Syntax error -- no data! Just skip it. */
149			continue;
150		}
151
152		linelen -= (p - instr);
153		if (args->buf.buflen <= linelen) {	/* not enough buffer */
154			args->erange = 1;
155			break;
156		}
157		(void) memcpy(args->buf.buffer, p, linelen);
158		args->buf.buffer[linelen] = '\0';
159		args->returnval = args->buf.result;
160		args->returnlen = linelen;
161		res = NSS_SUCCESS;
162		break;
163	}
164	(void) _nss_files_endent(be, 0);
165	return (res);
166}
167