nsparser.y revision 1.12 
1%{
2/*	$NetBSD: nsparser.y,v 1.12 2012/03/20 17:44:18 matt Exp $	*/
3
4/*-
5 * Copyright (c) 1997, 1998, 1999 The NetBSD Foundation, Inc.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to The NetBSD Foundation
9 * by Luke Mewburn.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33#include <sys/cdefs.h>
34#if defined(LIBC_SCCS) && !defined(lint)
35__RCSID("$NetBSD: nsparser.y,v 1.12 2012/03/20 17:44:18 matt Exp $");
36#endif /* LIBC_SCCS and not lint */
37
38#include "namespace.h"
39
40#include <assert.h>
41#define _NS_PRIVATE
42#include <nsswitch.h>
43#include <stdio.h>
44#include <string.h>
45#include <syslog.h>
46
47
48static	void	_nsaddsrctomap(const char *);
49
50static	ns_dbt		curdbt;
51static	ns_src		cursrc;
52
53extern char *	_nsyytext;
54extern int _nsyylineno;
55%}
56
57%union {
58	char *str;
59	int   mapval;
60}
61
62%token	NL
63%token	SUCCESS UNAVAIL NOTFOUND TRYAGAIN
64%token	RETURN CONTINUE
65%token	<str> STRING
66
67%type	<mapval> Status Action
68
69%%
70
71File
72	:	/* empty */
73	| Lines
74	;
75
76Lines
77	: Entry
78	| Lines Entry
79	;
80
81Entry
82	: NL
83	| Database ':' NL
84	| Database ':' Srclist NL
85		{
86			int lineno;
87
88			lineno = _nsyylineno - (*_nsyytext == '\n' ? 1 : 0);
89			if (_nsdbtput(&curdbt) == -1)
90				syslog(LOG_WARNING,
91				    "libc nsdispatch: %s line %d: %s",
92				    _PATH_NS_CONF, lineno,
93				    "error adding entry");
94		}
95	| error NL
96		{
97			yyerrok;
98		}
99	;
100
101Database
102	: STRING
103		{
104			curdbt.name = yylval.str;
105			curdbt.srclist = NULL;
106			curdbt.srclistsize = 0;
107		}
108	;
109
110Srclist
111	: Item
112	| Srclist Item
113	;
114
115Item
116	: STRING
117		{
118			cursrc.flags = NS_SUCCESS;
119			_nsaddsrctomap($1);
120		}
121	| STRING '[' { cursrc.flags = NS_SUCCESS; } Criteria ']'
122		{
123			_nsaddsrctomap($1);
124		}
125	;
126
127Criteria
128	: Criterion
129	| Criteria Criterion
130	;
131
132Criterion
133	: Status '=' Action
134		{
135			if ($3)		/* if action == RETURN set RETURN bit */
136				cursrc.flags |= $1;
137			else		/* else unset it */
138				cursrc.flags &= ~$1;
139		}
140	;
141
142Status
143	: SUCCESS	{ $$ = NS_SUCCESS; }
144	| UNAVAIL	{ $$ = NS_UNAVAIL; }
145	| NOTFOUND	{ $$ = NS_NOTFOUND; }
146	| TRYAGAIN	{ $$ = NS_TRYAGAIN; }
147	;
148
149Action
150	: RETURN	{ $$ = 1L; }
151	| CONTINUE	{ $$ = 0L; }
152	;
153
154%%
155
156static void
157_nsaddsrctomap(const char *elem)
158{
159	unsigned int	i;
160	int		lineno;
161
162	_DIAGASSERT(elem != NULL);
163
164	lineno = _nsyylineno - (*_nsyytext == '\n' ? 1 : 0);
165	if (curdbt.srclistsize > 0) {
166		if ((strcasecmp(elem, NSSRC_COMPAT) == 0) ||
167		    (strcasecmp(curdbt.srclist[0].name, NSSRC_COMPAT) == 0)) {
168			syslog(LOG_WARNING,
169			    "libc nsdispatch: %s line %d: %s",
170			    _PATH_NS_CONF, lineno,
171			    "'compat' used with other sources");
172			return;
173		}
174	}
175	for (i = 0; i < curdbt.srclistsize; i++) {
176		if (strcasecmp(curdbt.srclist[i].name, elem) == 0) {
177			syslog(LOG_WARNING,
178			    "libc nsdispatch: %s line %d: %s '%s'",
179			    _PATH_NS_CONF, lineno,
180			    "duplicate source", elem);
181			return;
182		}
183	}
184	cursrc.name = elem;
185	if (_nsdbtaddsrc(&curdbt, &cursrc) == -1) {
186		syslog(LOG_WARNING,
187		    "libc nsdispatch: %s line %d: %s '%s'",
188		    _PATH_NS_CONF, lineno,
189		    "error adding", elem);
190	}
191}
192