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New extension: load-balancing based on numerical user-name AVP values
author Sebastien Decugis <sdecugis@nict.go.jp>
date Wed, 25 Aug 2010 19:00:25 +0900
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179ef7de53de New extension: load-balancing based on numerical user-name AVP values
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1 /*********************************************************************************************************
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2 * Software License Agreement (BSD License) *
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3 * Author: Sebastien Decugis <sdecugis@nict.go.jp> *
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4 * *
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5 * Copyright (c) 2010, WIDE Project and NICT *
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6 * All rights reserved. *
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7 * *
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8 * Redistribution and use of this software in source and binary forms, with or without modification, are *
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9 * permitted provided that the following conditions are met: *
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10 * *
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11 * * Redistributions of source code must retain the above *
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12 * copyright notice, this list of conditions and the *
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13 * following disclaimer. *
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14 * *
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15 * * Redistributions in binary form must reproduce the above *
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16 * copyright notice, this list of conditions and the *
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17 * following disclaimer in the documentation and/or other *
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18 * materials provided with the distribution. *
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19 * *
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20 * * Neither the name of the WIDE Project or NICT nor the *
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21 * names of its contributors may be used to endorse or *
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22 * promote products derived from this software without *
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23 * specific prior written permission of WIDE Project and *
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24 * NICT. *
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25 * *
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26 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED *
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27 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A *
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28 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR *
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29 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT *
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30 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS *
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31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR *
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32 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF *
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33 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *
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34 *********************************************************************************************************/
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35
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36 /* Yacc extension's configuration parser.
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37 * The configuration file consists in a list of two or more:
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38 * serv = "a.server.diameter.id";
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39 */
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40
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41 /* For development only : */
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42 %debug
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43 %error-verbose
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44
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45 /* The parser receives the configuration file filename as parameter */
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46 %parse-param {char * conffile}
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47
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48 /* Keep track of location */
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49 %locations
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50 %pure-parser
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51
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52 %{
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53 #include "rtun.h"
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54 #include "rtun_conf.tab.h" /* bison is not smart enough to define the YYLTYPE before including this code, so... */
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55
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56 /* Forward declaration */
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57 int yyparse(char * conffile);
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58
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59 /* Parse the configuration file */
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60 int rtun_conf_handle(char * conffile)
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61 {
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62 extern FILE * rtun_confin;
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63 int ret;
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64
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65 TRACE_ENTRY("%p", conffile);
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66
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67 TRACE_DEBUG (FULL, "Parsing configuration file: %s...", conffile);
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68
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69 rtun_confin = fopen(conffile, "r");
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70 if (rtun_confin == NULL) {
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71 ret = errno;
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72 fd_log_debug("Unable to open extension configuration file %s for reading: %s\n", conffile, strerror(ret));
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73 TRACE_DEBUG (INFO, "Error occurred, message logged -- configuration file.");
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74 return ret;
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75 }
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76
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77 ret = yyparse(conffile);
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78
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79 fclose(rtun_confin);
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80
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81 if (ret != 0) {
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82 TRACE_DEBUG (INFO, "Unable to parse the configuration file.");
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83 return EINVAL;
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84 } else {
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85 TRACE_DEBUG(FULL, "[rt-un-nb] Added %d servers successfully.", rtun_conf.serv_nb);
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86 }
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87
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88 return 0;
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89 }
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90
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91 /* The Lex parser prototype */
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92 int rtun_conflex(YYSTYPE *lvalp, YYLTYPE *llocp);
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93
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94 /* Function to report the errors */
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95 void yyerror (YYLTYPE *ploc, char * conffile, char const *s)
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96 {
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97 TRACE_DEBUG(INFO, "Error in configuration parsing");
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98
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99 if (ploc->first_line != ploc->last_line)
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100 fd_log_debug("%s:%d.%d-%d.%d : %s\n", conffile, ploc->first_line, ploc->first_column, ploc->last_line, ploc->last_column, s);
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101 else if (ploc->first_column != ploc->last_column)
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102 fd_log_debug("%s:%d.%d-%d : %s\n", conffile, ploc->first_line, ploc->first_column, ploc->last_column, s);
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103 else
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104 fd_log_debug("%s:%d.%d : %s\n", conffile, ploc->first_line, ploc->first_column, s);
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105 }
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106
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107 %}
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108
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109 /* Values returned by lex for token */
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110 %union {
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111 char *string; /* The string is allocated by strdup in lex.*/
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112 }
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113
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114 /* In case of error in the lexical analysis */
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115 %token LEX_ERROR
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116
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117 /* A (de)quoted string (malloc'd in lex parser; it must be freed after use) */
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118 %token <string> QSTRING
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119
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120 /* Tokens */
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121 %token SERV
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122
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123
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124 /* -------------------------------------- */
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125 %%
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126
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127 /* The grammar definition */
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128 conffile: /* empty grammar is OK */
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129 | conffile serv
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130 ;
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131
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132 /* a server entry */
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133 serv: SERV '=' QSTRING ';'
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134 {
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135 /* Add this new server in the list */
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136 rtun_conf.serv_nb += 1;
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137 CHECK_MALLOC_DO( rtun_conf.servs = realloc(rtun_conf.servs, rtun_conf.serv_nb * sizeof(char *)),
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138 {
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139 yyerror (&yylloc, conffile, "Not enough memory to store the configuration...");
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140 YYERROR;
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141 } );
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142
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143 rtun_conf.servs[rtun_conf.serv_nb - 1] = $3;
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144 }
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145 ;
"Welcome to our mercurial repository"