lib/libc/net/nsparser.y

   1 %{
   2 /*      $NetBSD: nsparser.y,v 1.3 1999/01/25 00:16:18 lukem 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  * 3. All advertising materials mentioning features or use of this software
  20  *    must display the following acknowledgement:
  21  *        This product includes software developed by the NetBSD
  22  *        Foundation, Inc. and its contributors.
  23  * 4. Neither the name of The NetBSD Foundation nor the names of its
  24  *    contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  28  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  29  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  30  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  31  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  32  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  33  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  34  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  35  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  36  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  37  * POSSIBILITY OF SUCH DAMAGE.
  38  *
  39  * $FreeBSD: src/lib/libc/net/nsparser.y,v 1.6 2007/05/17 03:33:23 jon Exp $
  40  */
  41
  42 #include "namespace.h"
  43 #define _NS_PRIVATE
  44 #include <nsswitch.h>
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <string.h>
  48 #include <syslog.h>
  49 #include "un-namespace.h"
  50
  51 static  void    _nsaddsrctomap(const char *);
  52
  53 static  ns_dbt          curdbt;
  54 static  ns_src          cursrc;
  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  ERRORTOKEN
  66 %token  <str> STRING
  67
  68 %type   <mapval> Status Action
  69
  70 %%
  71
  72 File
  73         :       /* empty */
  74         | Lines
  75         ;
  76
  77 Lines
  78         : Entry
  79         | Lines Entry
  80         ;
  81
  82 Entry
  83         : NL
  84         | Database ':' NL
  85                 {
  86                         free((char*)curdbt.name);
  87                 }
  88         | Database ':' Srclist NL
  89                 {
  90                         _nsdbtput(&curdbt);
  91                 }
  92         | error NL
  93                 {
  94                         yyerrok;
  95                 }
  96         ;
  97
  98 Database
  99         : STRING
 100                 {
 101                         curdbt.name = yylval.str;
 102                         curdbt.srclist = NULL;
 103                         curdbt.srclistsize = 0;
 104                 }
 105         ;
 106
 107 Srclist
 108         : Item
 109         | Srclist Item
 110         ;
 111
 112 Item
 113         : STRING
 114                 {
 115                         cursrc.flags = NS_TERMINATE;
 116                         _nsaddsrctomap($1);
 117                 }
 118         | STRING '[' { cursrc.flags = NS_SUCCESS; } Criteria ']'
 119                 {
 120                         _nsaddsrctomap($1);
 121                 }
 122         ;
 123
 124 Criteria
 125         : Criterion
 126         | Criteria Criterion
 127         ;
 128
 129 Criterion
 130         : Status '=' Action
 131                 {
 132                         if ($3)      /* if action == RETURN set RETURN bit */
 133                                 cursrc.flags |= $1;
 134                         else         /* else unset it */
 135                                 cursrc.flags &= ~$1;
 136                 }
 137         ;
 138
 139 Status
 140         : SUCCESS       { $$ = NS_SUCCESS; }
 141         | UNAVAIL       { $$ = NS_UNAVAIL; }
 142         | NOTFOUND      { $$ = NS_NOTFOUND; }
 143         | TRYAGAIN      { $$ = NS_TRYAGAIN; }
 144         ;
 145
 146 Action
 147         : RETURN        { $$ = NS_ACTION_RETURN; }
 148         | CONTINUE      { $$ = NS_ACTION_CONTINUE; }
 149         ;
 150
 151 %%
 152
 153 static void
 154 _nsaddsrctomap(const char *elem)
 155 {
 156         int             i, lineno;
 157         extern int      _nsyylineno;
 158         extern char *   _nsyytext;
 159
 160         lineno = _nsyylineno - (*_nsyytext == '\n' ? 1 : 0);
 161         if (curdbt.srclistsize > 0) {
 162                 if (((strcasecmp(elem, NSSRC_COMPAT) == 0) &&
 163                     (strcasecmp(curdbt.srclist[0].name, NSSRC_CACHE) != 0)) ||
 164                     (strcasecmp(curdbt.srclist[0].name, NSSRC_COMPAT) == 0)) {
 165                         syslog(LOG_ERR,
 166             "NSSWITCH(nsparser): %s line %d: 'compat' used with sources, other than 'cache'",
 167                             _PATH_NS_CONF, lineno);
 168                         free((void*)elem);
 169                         return;
 170                 }
 171         }
 172         for (i = 0; i < curdbt.srclistsize; i++) {
 173                 if (strcasecmp(curdbt.srclist[i].name, elem) == 0) {
 174                         syslog(LOG_ERR,
 175                        "NSSWITCH(nsparser): %s line %d: duplicate source '%s'",
 176                             _PATH_NS_CONF, lineno, elem);
 177                         free((void*)elem);
 178                         return;
 179                 }
 180         }
 181         cursrc.name = elem;
 182         _nsdbtaddsrc(&curdbt, &cursrc);
 183 }