src/server/config/objconf.c

Fri, 24 Feb 2023 09:18:47 +0100

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Fri, 24 Feb 2023 09:18:47 +0100
changeset 455
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parent 453
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child 459
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permissions
-rw-r--r--

fix double free in case parsing a config file fails

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1 /*
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 *
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4 * Copyright 2013 Olaf Wintermann. All rights reserved.
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5 *
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions are met:
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8 *
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9 * 1. Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer.
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11 *
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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26 * POSSIBILITY OF SUCH DAMAGE.
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27 */
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28
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29 #include "objconf.h"
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30 #include "logging.h"
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31
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32 #include <string.h>
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33
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34 #include <cx/utils.h>
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35
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36 /* dev notes:
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37 *
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38 * to free ObjectConfig, free:
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39 * line dlist
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40 * mempool
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41 * object
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42 */
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43
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44 ObjectConfig *load_object_config(char *file) {
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45 FILE *in = fopen(file, "r");
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46 if(in == NULL) {
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47 return NULL;
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48 }
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49
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50 ObjectConfig *conf = malloc(sizeof(ObjectConfig));
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51 conf->parser.parse = objconf_parse;
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52 conf->file = file;
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53 //conf->conditions = NULL;
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54 conf->levels = NULL;
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55 conf->objects = cxPointerLinkedListCreate(cxDefaultAllocator, cx_cmp_ptr);
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56 //conf->lines = NULL;
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57
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58 int r = cfg_parse_basic_file((ConfigParser*)conf, in);
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59 if(r != 0) {
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60 // TODO: free
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61 return NULL;
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62 }
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63
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64 fclose(in);
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65
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66 return conf;
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67 }
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68
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69 ObjectConfig2* objectconf_load(const char *file) {
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70 CxMempool *mp = cxBasicMempoolCreate(512);
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71 if(!mp) {
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72 return NULL;
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73 }
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74
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75 // setup parser
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76 ConfigParser2 parser;
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77 memset(&parser, 0, sizeof(ConfigParser2));
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78 parser.mp = mp;
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79 parser.delim = "()/*%";
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80 parser.validateDirective = objectconf_validate_directive;
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81 parser.validateObjBegin = objectconf_validate_objbegin;
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82 parser.validateObjEnd = objectconf_validate_objend;
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83 parser.allow_hierarchy = 1;
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84
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85 ConfigNode *obj_config = serverconfig_load_file(&parser, file);
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86 if(!obj_config) {
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87 cxMempoolDestroy(mp);
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88 return NULL;
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89 }
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90
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91 ObjectConfig2 *conf = cxMalloc(mp->allocator, sizeof(ObjectConfig2));
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92 if(!conf) {
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93 cxMempoolDestroy(mp);
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94 return NULL;
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95 }
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96
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97 conf->mp = mp;
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98 conf->root = obj_config;
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99
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100 return conf;
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101 }
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102
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103 void objectconf_free(ObjectConfig2 *objconf) {
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104 cxMempoolDestroy(objconf->mp);
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105 }
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106
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107 int objectconf_validate_directive(ConfigParser2 *parser, ConfigNode *node) {
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108 // It is possible that this function is called for Objects
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109 // if { is on the next line
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110 // It may be possible to fix the parser to not do that, but it is fine
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111 // to just deal with that here
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112
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113 // ignore if node->name is an Object name like
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114 // Object, Client, If, Else IfElse
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115 const char *objnames[] = { "Object", "Client", "If", "ElseIf", "Else" };
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116 size_t typeindex;
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117 if(!serverconfig_validate_directive_name(node, objnames, 5, &typeindex)) {
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118 return 0;
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119 }
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120
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121 // now check directive type
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122 const char *dirtypes[] = { "AuthTrans", "NameTrans", "PathCheck", "ObjectType", "Service", "AddLog", "Error" };
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123 if(serverconfig_validate_directive_name(node, dirtypes, 7, &typeindex)) {
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124 return 1;
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125 }
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126
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127 // directives must have parameter names
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128 ConfigParam *param_err;
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129 if(serverconfig_check_param_names(node, &param_err)) {
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130 return 1;
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131 }
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132
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133 // check if the fn parameter exists
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134 cxstring fn = serverconfig_directive_get_arg(node, cx_str("fn"));
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135 if(fn.length == 0) {
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136 return 1;
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137 }
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138
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139 return 0;
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140 }
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141
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142 static int validate_else_node(ConfigNode *node) {
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143 // previous node must be "If" or "ElseIf"
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144 ConfigNode *prev = serverconfig_previous_dir_or_obj(node);
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145 const char *allowed_prev_types[] = { "If", "ElseIf" };
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146 size_t typeindex;
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147 if(serverconfig_validate_directive_name(prev, allowed_prev_types, 2, &typeindex)) {
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148 return 1; // prevous node (not counting space, comments) is not "If" or "Else"
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149 }
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150
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151 // "Else" must have no args
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152 return node->args ? 1 : 0;
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153 }
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154
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155 static int validate_elseif_node(ConfigNode *node) {
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156 // the previous node must be "If" or "IfElse"
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157 // in case if "IfElse", we also have to check all previous nodes, until
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158 // we find the starting "If" node
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159 const char *allowed_prev_types[] = { "If", "ElseIf" };
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160 size_t typeindex;
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161 ConfigNode *prev = serverconfig_previous_dir_or_obj(node);
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162 while(prev) {
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163 if(serverconfig_validate_directive_name(prev, allowed_prev_types, 2, &typeindex)) {
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164 return 1; // previous node was not "If" or "ElseIf"
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165 }
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166 // we found a valid "If" node, the whole construct is valid
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167 if(typeindex == 0) {
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168 return 0;
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169 }
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170
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171 prev = serverconfig_previous_dir_or_obj(node);
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172 }
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173 // at this point we found only "IfElse" nodes, but no "If" node
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174 return 1;
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175 }
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176
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177 int objectconf_validate_objbegin(ConfigParser2 *parser, ConfigNode *node) {
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178 // get object type
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179 const char *objnames[] = { "Object", "Client", "If", "ElseIf", "Else" };
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180 size_t typeindex;
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181 if(serverconfig_validate_directive_name(node, objnames, 5, &typeindex)) {
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182 return 1; // unknown object type
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183 }
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184
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185 // some special requirements for "Else" node
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186 if(typeindex == 4) {
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187 // type is "Else"
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188 return validate_else_node(node);
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189 }
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190
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191 // check "ElseIf" was used after "If" or "IfElse"
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192 if(typeindex == 3 && validate_elseif_node(node)) {
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193 return 1;
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194 }
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195
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196 // only Object must have a name/value arg, other types can have more
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197 // complex parameters
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198 if(typeindex == 0) {
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199 // type is "Object"
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200 ConfigParam *err;
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201 if(serverconfig_check_param_names(node, &err)) {
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202 return 1;
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203 }
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204 return 0;
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205 }
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206
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207 // all remaining object types must have arguments, but don't check more
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208 return node->args ? 0 : 1;
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209 }
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210
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211 int objectconf_validate_objend(ConfigParser2 *parser, ConfigNode *node) {
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212 return 0;
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213 }
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214
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215
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216 void free_object_config(ObjectConfig *conf) {
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217 // free other lists
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218 if(conf->levels) {
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219 //ucx_list_free(conf->levels);
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220 }
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221
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222 // free mempool
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223 //ucx_mempool_destroy(conf->parser.mp->pool);
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224 free(conf);
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225 }
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226
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227
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228
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229 int objconf_parse(void *p, ConfigLine *begin, ConfigLine *end, cxmutstr line) {
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230 ObjectConfig *conf = p;
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231
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232 begin->type = cfg_get_line_type(line);
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233 switch(begin->type) {
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234 case LINE_BEGIN_TAG: {
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235 ConfigTag *tag = cfg_parse_begin_tag(line, conf->parser.mp);
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236 if(tag == NULL) {
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237 ws_cfg_log(LOG_FAILURE, "Parse error in %s", conf->file);
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238 exit(-1); // TODO: better error handling
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239 }
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240 tag->begin = begin;
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241 tag->end = end;
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242 tag->type_num = cfg_get_tag_type(cx_strcast(tag->name));
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243 //printf("line {%s}\n", cx_strdub(ll).ptr);
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244 if(objconf_on_begin_tag(conf, tag) != 0) {
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245 fprintf(stderr, "1error\n");
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246 exit(-1);
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247 }
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248 break;
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249 }
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250 case LINE_END_TAG: {
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251 cxmutstr tag = cfg_get_end_tag_name(line);
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252 if(objconf_on_end_tag(conf, tag) != 0) {
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253 fprintf(stderr, "2error\n");
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254 exit(-1);
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255 }
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256
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257 break;
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258 }
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259 case LINE_DIRECTIVE: {
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260 ConfigDirective *dir = cfg_parse_directive(
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261 line,
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262 conf->parser.mp);
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263 dir->begin = begin;
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264 dir->end = end;
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265 if(objconf_on_directive(conf, dir) != 0) {
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266 fprintf(stderr, "3error\n");
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267 exit(-1);
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268 }
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269 }
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270 }
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271 return 0;
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272 }
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273
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274 int objconf_on_begin_tag(ObjectConfig *conf, ConfigTag *tag) {
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275 CxAllocator *mp = conf->parser.mp;
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276 if(tag->type_num != TAG_OBJECT) {
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277 ConfigParserLevel *l = conf->levels;
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278 if(l->tag->type_num != TAG_OBJECT) {
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279 tag->parent = l->tag;
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280 }
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281 }
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282
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283
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284 switch(tag->type_num) {
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285 case TAG_OBJECT: {
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286 ConfigObject *obj = OBJ_NEW_N(mp, ConfigObject);
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287 obj->begin = tag->begin;
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288 obj->end = tag->end;
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289
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290 obj->name = cfg_param_get(tag->param, cx_str("name"));
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291 obj->ppath = cfg_param_get(tag->param, cx_str("ppath"));
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292
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293 conf->obj = obj;
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294 //conf->objects = ucx_list_append_a(mp, conf->objects, obj);
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295 cxListAdd(conf->objects, obj);
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296
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297 // create tree level object
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298 ConfigParserLevel *lvl = OBJ_NEW(mp, ConfigParserLevel);
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299 lvl->iftag = NULL;
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300 lvl->levelnum = 1;
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301 lvl->tag = tag;
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302 lvl->next = NULL;
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303 //conf->levels = ucx_list_prepend_a(mp, conf->levels, lvl);
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304 CFG_LEVEL_PREPEND(&conf->levels, lvl);
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305
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306 break;
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307 }
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308 case TAG_IF: {
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309 // create tree level object
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310 ConfigParserLevel *last_lvl = conf->levels;
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311
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312 ConfigParserLevel *lvl = OBJ_NEW(mp, ConfigParserLevel);
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313
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314 lvl->iftag = NULL;
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315 lvl->levelnum = last_lvl->levelnum + 1;
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316 lvl->tag = tag;
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317 //conf->levels = ucx_list_prepend_a(mp, conf->levels, lvl);
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318 CFG_LEVEL_PREPEND(&conf->levels, lvl);
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319 last_lvl->iftag = tag;
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320
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321 break;
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322 }
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323 case TAG_ELSEIF: {
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324 }
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325 case TAG_ELSE: {
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326 // create tree level object
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327 ConfigParserLevel *last_lvl = conf->levels;
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328 tag->iftag = last_lvl->iftag;
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329
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330 ConfigParserLevel *lvl = OBJ_NEW(
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331 conf->parser.mp,
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332 ConfigParserLevel);
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333
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334 lvl->iftag = last_lvl->tag;
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335 lvl->levelnum = last_lvl->levelnum + 1;
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336 lvl->tag = tag;
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337 //conf->levels = ucx_list_prepend(conf->levels, lvl);
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338 CFG_LEVEL_PREPEND(&conf->levels, lvl);
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339
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340 break;
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341 }
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342 case TAG_CLIENT: {
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343 // create tree level object
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344
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345 // TODO
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346
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347 break;
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348 }
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349 default: {
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350 ws_cfg_log(LOG_FAILURE, "objconf: unknown tag");
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351 return 1;
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352 }
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353 }
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354
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355 return 0;
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356 }
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357
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358 int objconf_on_end_tag(ObjectConfig *conf, cxmutstr tagname) {
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359 int type = cfg_get_tag_type(cx_strcast(tagname));
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360 if(type == -1) {
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361 ws_cfg_log(LOG_FAILURE, "objconf: unknown tag");
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362 return 1;
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363 } else {
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364 if(type == TAG_OBJECT) {
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365 conf->obj = NULL;
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366 }
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367
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368 // remove level
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369 /*
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370 conf->levels = ucx_list_remove_a(
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371 conf->parser.mp,
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372 conf->levels,
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373 conf->levels);
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374 */
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375 conf->levels = conf->levels->next;
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376 }
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377
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378 return 0;
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379 }
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380
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381 int objconf_on_directive(ObjectConfig *conf, ConfigDirective *dir) {
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382 ConfigParserLevel *lvl = conf->levels;
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383
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384 // check if we have a condition for the directive
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385 // if the level tag is not an object tag, use it as condition
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386 if(lvl->tag->type_num != TAG_OBJECT) {
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387 dir->condition = lvl->tag;
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388 }
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389
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390 // add directive to current object
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391 /*
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392 conf->obj->directives[dir->type_num] = ucx_list_append_a(
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393 conf->parser.mp,
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394 conf->obj->directives[dir->type_num],
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395 dir);
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396 */
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397
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398 ConfigDirectiveList *dir_entry = cxMalloc(conf->parser.mp, sizeof(ConfigDirectiveList));
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399 dir_entry->directive = dir;
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400 dir_entry->next = NULL;
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401 CFG_DIRECTIVES_ADD(&conf->obj->directives[dir->type_num], dir_entry);
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402
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403 return 0;
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404 }
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405

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