lib/libc/net/nsparser.y

   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
  48 static  void    _nsaddsrctomap(const char *);
  49
  50 static  ns_dbt          curdbt;
  51 static  ns_src          cursrc;
  52
  53 extern char *   _nsyytext;
  54 extern 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
  71 File
  72         :       /* empty */
  73         | Lines
  74         ;
  75
  76 Lines
  77         : Entry
  78         | Lines Entry
  79         ;
  80
  81 Entry
  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
 101 Database
 102         : STRING
 103                 {
 104                         curdbt.name = yylval.str;
 105                         curdbt.srclist = NULL;
 106                         curdbt.srclistsize = 0;
 107                 }
 108         ;
 109
 110 Srclist
 111         : Item
 112         | Srclist Item
 113         ;
 114
 115 Item
 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
 127 Criteria
 128         : Criterion
 129         | Criteria Criterion
 130         ;
 131
 132 Criterion
 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
 142 Status
 143         : SUCCESS       { $$ = NS_SUCCESS; }
 144         | UNAVAIL       { $$ = NS_UNAVAIL; }
 145         | NOTFOUND      { $$ = NS_NOTFOUND; }
 146         | TRYAGAIN      { $$ = NS_TRYAGAIN; }
 147         ;
 148
 149 Action
 150         : RETURN        { $$ = 1L; }
 151         | CONTINUE      { $$ = 0L; }
 152         ;
 153
 154 %%
 155
 156 static 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 }