Brian Waters | 13d9601 | 2017-12-08 16:53:31 -0600 | [diff] [blame] | 1 | /********************************************************************************************************* |
| 2 | * Software License Agreement (BSD License) * |
| 3 | * Author: Sebastien Decugis <sdecugis@freediameter.net> * |
| 4 | * * |
| 5 | * Copyright (c) 2013, WIDE Project and NICT * |
| 6 | * All rights reserved. * |
| 7 | * * |
| 8 | * Redistribution and use of this software in source and binary forms, with or without modification, are * |
| 9 | * permitted provided that the following conditions are met: * |
| 10 | * * |
| 11 | * * Redistributions of source code must retain the above * |
| 12 | * copyright notice, this list of conditions and the * |
| 13 | * following disclaimer. * |
| 14 | * * |
| 15 | * * Redistributions in binary form must reproduce the above * |
| 16 | * copyright notice, this list of conditions and the * |
| 17 | * following disclaimer in the documentation and/or other * |
| 18 | * materials provided with the distribution. * |
| 19 | * * |
| 20 | * * Neither the name of the WIDE Project or NICT nor the * |
| 21 | * names of its contributors may be used to endorse or * |
| 22 | * promote products derived from this software without * |
| 23 | * specific prior written permission of WIDE Project and * |
| 24 | * NICT. * |
| 25 | * * |
| 26 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED * |
| 27 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A * |
| 28 | * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR * |
| 29 | * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * |
| 30 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * |
| 31 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR * |
| 32 | * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF * |
| 33 | * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * |
| 34 | *********************************************************************************************************/ |
| 35 | |
| 36 | /* Yacc extension's configuration parser. |
| 37 | */ |
| 38 | |
| 39 | /* For development only : */ |
| 40 | %debug |
| 41 | %error-verbose |
| 42 | |
| 43 | /* The parser receives the configuration file filename as parameter */ |
| 44 | %parse-param {char * conffile} |
| 45 | |
| 46 | /* Keep track of location */ |
| 47 | %locations |
| 48 | %pure-parser |
| 49 | |
| 50 | %{ |
| 51 | #include "rtereg.h" |
| 52 | #include "rtereg_conf.tab.h" /* bison is not smart enough to define the YYLTYPE before including this code, so... */ |
| 53 | |
| 54 | /* Forward declaration */ |
| 55 | int yyparse(char * conffile); |
| 56 | |
| 57 | /* Parse the configuration file */ |
| 58 | int rtereg_conf_handle(char * conffile) |
| 59 | { |
| 60 | extern FILE * rtereg_confin; |
| 61 | int ret; |
| 62 | |
| 63 | TRACE_ENTRY("%p", conffile); |
| 64 | |
| 65 | TRACE_DEBUG (FULL, "Parsing configuration file: %s...", conffile); |
| 66 | |
| 67 | rtereg_confin = fopen(conffile, "r"); |
| 68 | if (rtereg_confin == NULL) { |
| 69 | ret = errno; |
| 70 | fd_log_debug("Unable to open extension configuration file %s for reading: %s", conffile, strerror(ret)); |
| 71 | TRACE_DEBUG (INFO, "Error occurred, message logged -- configuration file."); |
| 72 | return ret; |
| 73 | } |
| 74 | |
| 75 | ret = yyparse(conffile); |
| 76 | |
| 77 | fclose(rtereg_confin); |
| 78 | |
| 79 | if (ret != 0) { |
| 80 | TRACE_DEBUG (INFO, "Unable to parse the configuration file."); |
| 81 | return EINVAL; |
| 82 | } else { |
| 83 | TRACE_DEBUG(FULL, "[rt-ereg] Added %d rules successfully.", rtereg_conf.rules_nb); |
| 84 | } |
| 85 | |
| 86 | return 0; |
| 87 | } |
| 88 | |
| 89 | /* The Lex parser prototype */ |
| 90 | int rtereg_conflex(YYSTYPE *lvalp, YYLTYPE *llocp); |
| 91 | |
| 92 | /* Function to report the errors */ |
| 93 | void yyerror (YYLTYPE *ploc, char * conffile, char const *s) |
| 94 | { |
| 95 | TRACE_DEBUG(INFO, "Error in configuration parsing"); |
| 96 | |
| 97 | if (ploc->first_line != ploc->last_line) |
| 98 | fd_log_debug("%s:%d.%d-%d.%d : %s", conffile, ploc->first_line, ploc->first_column, ploc->last_line, ploc->last_column, s); |
| 99 | else if (ploc->first_column != ploc->last_column) |
| 100 | fd_log_debug("%s:%d.%d-%d : %s", conffile, ploc->first_line, ploc->first_column, ploc->last_column, s); |
| 101 | else |
| 102 | fd_log_debug("%s:%d.%d : %s", conffile, ploc->first_line, ploc->first_column, s); |
| 103 | } |
| 104 | |
| 105 | %} |
| 106 | |
| 107 | /* Values returned by lex for token */ |
| 108 | %union { |
| 109 | char *string; /* The string is allocated by strdup in lex.*/ |
| 110 | int integer; |
| 111 | } |
| 112 | |
| 113 | /* In case of error in the lexical analysis */ |
| 114 | %token LEX_ERROR |
| 115 | |
| 116 | /* A (de)quoted string (malloc'd in lex parser; it must be freed after use) */ |
| 117 | %token <string> QSTRING |
| 118 | %token <integer> INTEGER |
| 119 | |
| 120 | /* Tokens */ |
| 121 | %token AVP |
| 122 | |
| 123 | |
| 124 | /* -------------------------------------- */ |
| 125 | %% |
| 126 | |
| 127 | /* The grammar definition */ |
| 128 | conffile: rules avp rules |
| 129 | ; |
| 130 | |
| 131 | /* a server entry */ |
| 132 | avp: AVP '=' QSTRING ';' |
| 133 | { |
| 134 | if (rtereg_conf.avp != NULL) { |
| 135 | yyerror(&yylloc, conffile, "Only one AVP can be specified"); |
| 136 | YYERROR; |
| 137 | } |
| 138 | |
| 139 | CHECK_FCT_DO( fd_dict_search ( fd_g_config->cnf_dict, DICT_AVP, AVP_BY_NAME, $3, &rtereg_conf.avp, ENOENT ), |
| 140 | { |
| 141 | TRACE_DEBUG(INFO, "Unable to find '%s' AVP in the loaded dictionaries.", $3); |
| 142 | yyerror (&yylloc, conffile, "Invalid AVP value."); |
| 143 | YYERROR; |
| 144 | } ); |
| 145 | |
| 146 | /* Now check the type */ |
| 147 | { |
| 148 | struct dict_avp_data data; |
| 149 | CHECK_FCT( fd_dict_getval( rtereg_conf.avp, &data) ); |
| 150 | CHECK_PARAMS_DO (data.avp_basetype == AVP_TYPE_OCTETSTRING, |
| 151 | { |
| 152 | TRACE_DEBUG(INFO, "'%s' AVP in not an OCTETSTRING AVP (%d).", $3, data.avp_basetype); |
| 153 | yyerror (&yylloc, conffile, "AVP in not an OCTETSTRING type."); |
| 154 | YYERROR; |
| 155 | } ); |
| 156 | } |
| 157 | } |
| 158 | ; |
| 159 | |
| 160 | rules: /* empty OK */ |
| 161 | | rules rule |
| 162 | ; |
| 163 | |
| 164 | rule: QSTRING ':' QSTRING '+' '=' INTEGER ';' |
| 165 | { |
| 166 | struct rtereg_rule * new; |
| 167 | int err; |
| 168 | |
| 169 | /* Add new rule in the array */ |
| 170 | rtereg_conf.rules_nb += 1; |
| 171 | CHECK_MALLOC_DO(rtereg_conf.rules = realloc(rtereg_conf.rules, rtereg_conf.rules_nb * sizeof(struct rtereg_rule)), |
| 172 | { |
| 173 | yyerror (&yylloc, conffile, "Not enough memory to store the configuration..."); |
| 174 | YYERROR; |
| 175 | } ); |
| 176 | |
| 177 | new = &rtereg_conf.rules[rtereg_conf.rules_nb - 1]; |
| 178 | |
| 179 | new->pattern = $1; |
| 180 | new->server = $3; |
| 181 | new->score = $6; |
| 182 | |
| 183 | /* Attempt to compile the regex */ |
| 184 | CHECK_FCT_DO( err=regcomp(&new->preg, new->pattern, REG_EXTENDED | REG_NOSUB), |
| 185 | { |
| 186 | char * buf; |
| 187 | size_t bl; |
| 188 | |
| 189 | /* Error while compiling the regex */ |
| 190 | TRACE_DEBUG(INFO, "Error while compiling the regular expression '%s':", new->pattern); |
| 191 | |
| 192 | /* Get the error message size */ |
| 193 | bl = regerror(err, &new->preg, NULL, 0); |
| 194 | |
| 195 | /* Alloc the buffer for error message */ |
| 196 | CHECK_MALLOC( buf = malloc(bl) ); |
| 197 | |
| 198 | /* Get the error message content */ |
| 199 | regerror(err, &new->preg, buf, bl); |
| 200 | TRACE_DEBUG(INFO, "\t%s", buf); |
| 201 | |
| 202 | /* Free the buffer, return the error */ |
| 203 | free(buf); |
| 204 | |
| 205 | yyerror (&yylloc, conffile, "Invalid regular expression."); |
| 206 | YYERROR; |
| 207 | } ); |
| 208 | } |
| 209 | ; |