src/server/util/object.c

Sat, 03 Dec 2022 12:27:00 +0100

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Sat, 03 Dec 2022 12:27:00 +0100
changeset 445
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parent 437
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child 452
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permissions
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improve acceptor error handling

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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 <cx/string.h>
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30 #include <cx/linked_list.h>
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31 #include <cx/array_list.h>
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32 #include <cx/compare.h>
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33
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34 #include "../public/nsapi.h"
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35
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36 #include "object.h"
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37 #include "util.h"
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38 #include "pool.h"
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39 #include "../daemon/func.h"
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41
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42
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43 httpd_object* object_new(pool_handle_t *pool, char *name) {
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44 httpd_object *obj = pool_malloc(pool, sizeof(httpd_object));
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45 obj->pool = pool;
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46 obj->name = name;
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47 obj->path = NULL;
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48
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49 // create directive table
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50 obj->dt = pool_calloc(pool, NUM_NSAPI_TYPES - 1, sizeof(struct dtable));
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51 obj->nd = NUM_NSAPI_TYPES - 1;
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53 return obj;
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54 }
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55
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56 void object_free(httpd_object *obj) {
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57 //free(obj->name);
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58 //free(obj->dt);
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59 }
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61
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62 int object_add_directive(httpd_object *obj, directive *dir, int dt) {
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63 dtable *l = object_get_dtable(obj, dt);
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64 // allocate space for the new directive
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65 if(l->ndir >= l->alloc) {
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66 l->alloc += 8;
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67 directive **drs = pool_realloc(obj->pool, l->dirs, (l->alloc)*sizeof(void*));
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68 if(!drs) {
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69 l->alloc -= 8;
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70 return -1;
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71 }
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72 l->dirs = drs;
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73 }
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74
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75 // add directive
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76 l->dirs[l->ndir++] = dir;
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77 return 0;
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78 }
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80
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81 /* objset functions */
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82 httpd_objset* objset_create(pool_handle_t *pool) {
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83 httpd_objset *os = pool_malloc(pool, sizeof(httpd_objset));
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84
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85 os->obj = pool_calloc(pool, 2, sizeof(void*));
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86 os->pos = 0;
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87
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88 return os;
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89 }
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90
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91 void objset_add_object(pool_handle_t *p, httpd_objset *os, httpd_object *obj) {
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92 if(os->pos != 0 && os->pos % 2 == 0) {
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93 os->obj = pool_realloc(p, os->obj, (os->pos + 2) * sizeof(void*));
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94 }
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95 os->obj[os->pos] = obj;
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96 os->pos++;
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97 }
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98
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99 void httpobjconf_add_object(HTTPObjectConfig *conf, httpd_object *obj) {
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100 conf->nobj++;
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101 conf->objects = realloc(conf->objects, conf->nobj * sizeof(void*));
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102 conf->objects[conf->nobj - 1] = obj;
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103 }
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104
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105
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106 void nsapi_context_next_stage(NSAPIContext *context) {
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107 context->dtable_index = 0;
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108 context->objset_index = -1;
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109 context->last_req_code = REQ_NOACTION;
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110 }
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111
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112
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113 /* ------------------------------ Expression ------------------------------ */
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114
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115 Expression* condition_create(pool_handle_t *pool, CxList *tokens) {
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116 size_t pos = 0;
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117 NSAPIExpression *expression = expr_parse_logical_expr(pool, tokens, &pos);
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118 if(!expression || pos != tokens->size) {
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119 return NULL;
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120 }
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121
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122 return NULL;
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123 }
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124
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125
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126 typedef struct {
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127 pool_handle_t *pool;
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128 CxList *op_stack;
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129 CxList *ex_stack;
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130 CxList *tokens;
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131 size_t *pos;
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132 WSBool expect_value;
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133 WSBool expect_arg;
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134 } ExprParser;
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135
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136 typedef struct {
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137 NSAPIExpressionOperator operator;
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138 cxstring identifier;
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139 int expect_value;
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140 int open_parenthesis;
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141 } ExprOpStackItem;
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142
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143 static void expr_free(pool_handle_t *pool, NSAPIExpression *expr) {
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144 if(expr->left) {
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145 expr_free(pool, expr->left);
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146 }
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147 if(expr->right) {
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148 expr_free(pool, expr->right);
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149 }
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150 if(expr->type == NSAPI_EXPRESSION_STRING && expr->value.str.ptr) {
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151 pool_free(pool, (char*)expr->value.str.ptr);
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152 } else if(expr->type == NSAPI_EXPRESSION_VARIABLE && expr->value.var.ptr) {
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153 pool_free(pool, (char*)expr->value.var.ptr);
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154 }
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155 pool_free(pool, expr);
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156 }
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157
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158 static NSAPIExpressionOperator expr_operator(cxstring token) {
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159 if(!cx_strcmp(token, cx_str(","))) {
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160 return NSAPI_EXPRESSION_ARG;
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161 } else if(!cx_strcmp(token, cx_str("+"))) {
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162 return NSAPI_EXPRESSION_ADD;
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163 } else if(!cx_strcmp(token, cx_str("-"))) {
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164 return NSAPI_EXPRESSION_SUB;
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165 } else if(!cx_strcmp(token, cx_str("*"))) {
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166 return NSAPI_EXPRESSION_MUL;
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167 } else if(!cx_strcmp(token, cx_str("/"))) {
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168 return NSAPI_EXPRESSION_DIV;
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169 } else if(!cx_strcmp(token, cx_str("%"))) {
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170 return NSAPI_EXPRESSION_MOD;
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171 } else if(!cx_strcmp(token, cx_str("not"))) {
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172 return NSAPI_EXPRESSION_NOT;
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173 } else if(!cx_strcmp(token, cx_str("and"))) {
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174 return NSAPI_EXPRESSION_AND;
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175 } else if(!cx_strcmp(token, cx_str("or"))) {
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176 return NSAPI_EXPRESSION_OR;
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177 } else if(!cx_strcmp(token, cx_str("xor"))) {
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178 return NSAPI_EXPRESSION_XOR;
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179 } else if(!cx_strcmp(token, cx_str("=="))) {
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180 return NSAPI_EXPRESSION_EQ;
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181 } else if(!cx_strcmp(token, cx_str("!="))) {
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182 return NSAPI_EXPRESSION_NEQ;
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183 } else if(!cx_strcmp(token, cx_str(">"))) {
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184 return NSAPI_EXPRESSION_GT;
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185 } else if(!cx_strcmp(token, cx_str("<"))) {
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186 return NSAPI_EXPRESSION_LT;
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187 } else if(!cx_strcmp(token, cx_str(">="))) {
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188 return NSAPI_EXPRESSION_GE;
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189 } else if(!cx_strcmp(token, cx_str("<="))) {
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190 return NSAPI_EXPRESSION_LE;
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191 }
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192 return NSAPI_EXPRESSION_NOOP;
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193 }
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194
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195 static int token_is_int(cxstring token) {
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196 if(token.length == 0) {
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197 return 0;
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198 }
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199
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200 size_t start = 0;
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201 if(token.ptr[0] == '-' || token.ptr[0] == '+') {
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202 if(token.length < 2) {
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203 return 0;
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204 }
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205 start++;
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206 }
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207
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208 for(size_t i=start;i<token.length;i++) {
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209 if(!isdigit(token.ptr[i])) {
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210 return 0;
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211 }
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212 }
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213 return 1;
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214 }
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215
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216 static int expr_set_value(pool_handle_t *pool, NSAPIExpression *expr, cxstring token) {
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217 if(token.length >= 2 && token.ptr[0] == '\"' && token.ptr[token.length-1] == '\"') {
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218 expr->value.str = cx_strcast(cx_strdup_a(pool_allocator(pool), cx_strsubsl(token, 1, token.length-2)));
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219 expr->type = NSAPI_EXPRESSION_STRING;
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220 } else if(token.length >= 2 && token.ptr[0] == '$' && isalpha(token.ptr[1])) {
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221 expr->value.var = cx_strcast(cx_strdup_a(pool_allocator(pool), cx_strsubs(token, 1)));
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222 expr->type = NSAPI_EXPRESSION_VARIABLE;
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223 } else if(token_is_int(token)) {
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224 if(!util_strtoint(token.ptr, &expr->value.i)) {
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225 return 1;
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226 }
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227 expr->type = NSAPI_EXPRESSION_INT;
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228 } else if(!strcmp(token.ptr, "true")) {
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229 expr->type = NSAPI_EXPRESSION_BOOL;
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230 expr->value.b = 1;
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231 } else if(!strcmp(token.ptr, "false")) {
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232 expr->type = NSAPI_EXPRESSION_BOOL;
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233 expr->value.b = 0;
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234 } else {
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235 return 1;
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236 }
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237 // TODO: double
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238 return 0;
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239 }
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240
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241 cxstring expr_next_token(CxList *tokens, size_t *pos) {
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242 cxstring *token = cxListAt(tokens, *pos);
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243 if(token) {
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244 (*pos)++;
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245 return *token;
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246 }
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247 return (cxstring){NULL, 0};
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248 }
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249
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250 NSAPIExpression* expr_parser_pop(ExprParser *parser) {
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251 CxList *stack = parser->ex_stack;
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252 if(stack->size == 0) {
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253 return NULL;
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254 }
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255 NSAPIExpression *ret = *((NSAPIExpression**)cxListAt(stack, stack->size-1));
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256 cxListRemove(stack, stack->size-1);
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257 return ret;
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258 }
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259
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260 // takes items from ex_stack and adds a new operator expression to ex_stack
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261 static int expr_add_operator(ExprParser *parser, ExprOpStackItem *op) {
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262 NSAPIExpression *exp = pool_malloc(parser->pool, sizeof(NSAPIExpression));
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263 exp->operator = op->operator;
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264 // op->expect_value == TRUE means, that the operator was found in a case
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265 // a value was expected.
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266 // For example: 1 + - 2
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267 // After + a value is expected, but there is the - operator
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268 // in that case, the - operator is a unary expression
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269 if(op->expect_value) {
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270 // We expected a value but got an operator? This must be an unary operator
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271
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272 if(op->operator == NSAPI_EXPRESSION_ARG && !parser->expect_arg) {
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273 // simplify unary arg
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274 pool_free(parser->pool, exp);
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275 parser->expect_value = TRUE;
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276 parser->expect_arg = FALSE;
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277 return 0;
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278 }
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279
423
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280 exp->type = NSAPI_EXPRESSION_UNARY;
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281 exp->left = expr_parser_pop(parser);
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282 exp->right = NULL;
423
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283 } else {
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284 // binary operator
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285 exp->type = NSAPI_EXPRESSION_BINARY;
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286 exp->right = expr_parser_pop(parser);
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287 exp->left = expr_parser_pop(parser);
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288 }
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289
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290 if(!exp->left && !exp->right) {
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291 return 1; // error
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292 }
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293
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294 cxListAdd(parser->ex_stack, &exp);
423
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295
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296 parser->expect_value = TRUE;
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297 parser->expect_arg = FALSE;
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298 return 0;
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299 }
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300
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301 static int expr_add_func(ExprParser *parser, ExprOpStackItem *func) {
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302 NSAPIExpression *exp = pool_malloc(parser->pool, sizeof(NSAPIExpression));
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303 if(!exp) {
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304 return 1;
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305 }
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306 exp->type = NSAPI_EXPRESSION_IDENTIFIER;
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307 exp->operator = NSAPI_EXPRESSION_CALL;
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308 exp->left = NULL;
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309 exp->right = NULL;
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310 exp->value.str = func->identifier;
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311
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diff changeset
312 if(parser->ex_stack->size > 0) {
437
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313 NSAPIExpression *top = *((NSAPIExpression**)cxListAt(parser->ex_stack, parser->ex_stack->size - 1));
435
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314 if(top && top->operator == NSAPI_EXPRESSION_ARG) {
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315 exp->left = top;
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316 cxListRemove(parser->ex_stack, parser->ex_stack->size - 1);
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317 }
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318 }
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319
437
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diff changeset
320 if(cxListAdd(parser->ex_stack, &exp)) {
435
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321 return 1;
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322 }
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323 parser->expect_value = FALSE;
423
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324 return 0;
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325 }
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326
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327 // converts the token to a value expression (int, bool, str, ...)
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328 // and adds it to parser->ex_stack
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329 // sets parser->expect_value to false
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330 static int expr_add_value(ExprParser *parser, cxstring token) {
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331 NSAPIExpression *exp = pool_malloc(parser->pool, sizeof(NSAPIExpression));
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332 ZERO(exp, sizeof(NSAPIExpression));
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333 if(expr_set_value(parser->pool, exp, token)) {
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334 return 1;
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335 }
435
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336
437
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337 cxListAdd(parser->ex_stack, &exp);
435
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338 if(parser->expect_arg) {
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339 ExprOpStackItem argList;
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340 argList.expect_value = TRUE;
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341 argList.identifier = (cxstring){NULL, 0};
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342 argList.open_parenthesis = FALSE;
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343 argList.operator = NSAPI_EXPRESSION_ARG;
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344 if(expr_add_operator(parser, &argList)) {
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345 return 1;
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346 }
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347 }
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348
423
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349 parser->expect_value = FALSE;
435
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350 parser->expect_arg = FALSE;
423
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351 return 0;
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352 }
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353
435
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354 static int token_is_identifier(cxstring token) {
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355 if(token.length == 0) {
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356 return 0;
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357 }
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358
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diff changeset
359 if(!isalpha(token.ptr[0])) {
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360 return 0;
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diff changeset
361 }
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362
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diff changeset
363 for(int i=1;i<token.length;i++) {
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diff changeset
364 if(!isalnum(token.ptr[i])) {
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365 return 0;
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diff changeset
366 }
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367 }
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diff changeset
368
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diff changeset
369 if(!cx_strcmp(token, cx_str("true")) || !cx_strcmp(token, cx_str("false"))) {
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diff changeset
370 return 0;
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diff changeset
371 }
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diff changeset
372
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diff changeset
373 return 1;
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diff changeset
374 }
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diff changeset
375
423
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diff changeset
376
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377 static NSAPIExpression* expr_parse_expr(ExprParser *parser) {
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378 CxList *op_stack = parser->op_stack;
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diff changeset
379 CxList *ex_stack = parser->ex_stack;
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diff changeset
380
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381 // Shunting yard algorithm
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382 cxstring token = expr_next_token(parser->tokens, parser->pos);
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diff changeset
383 for(;token.ptr;token=expr_next_token(parser->tokens, parser->pos)) {
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diff changeset
384 NSAPIExpressionOperator op = expr_operator(token);
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diff changeset
385 if(op != NSAPI_EXPRESSION_NOOP) {
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diff changeset
386 ExprOpStackItem new_op;
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diff changeset
387 new_op.operator = op;
435
713ec3da79ec expression parser: add support for functions
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diff changeset
388 new_op.identifier = (cxstring){NULL,0};
423
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diff changeset
389 new_op.expect_value = parser->expect_value;
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diff changeset
390 new_op.open_parenthesis = FALSE;
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parents: 421
diff changeset
391 while(op_stack->size > 0) {
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diff changeset
392 ExprOpStackItem *stack_item = cxListAt(op_stack, op_stack->size-1);
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parents: 421
diff changeset
393 if(stack_item->operator == NSAPI_EXPRESSION_NOOP) {
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parents: 421
diff changeset
394 break;
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parents: 421
diff changeset
395 }
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parents: 421
diff changeset
396 // check presedence
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parents: 421
diff changeset
397 if(op >= stack_item->operator) {
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diff changeset
398 break;
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parents: 421
diff changeset
399 }
bb7cff720dd0 add obj.conf expression parser
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parents: 421
diff changeset
400 if(expr_add_operator(parser, stack_item)) {
bb7cff720dd0 add obj.conf expression parser
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diff changeset
401 return NULL;
bb7cff720dd0 add obj.conf expression parser
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parents: 421
diff changeset
402 }
bb7cff720dd0 add obj.conf expression parser
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parents: 421
diff changeset
403 cxListRemove(op_stack, op_stack->size-1);
bb7cff720dd0 add obj.conf expression parser
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parents: 421
diff changeset
404 }
bb7cff720dd0 add obj.conf expression parser
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parents: 421
diff changeset
405 cxListAdd(op_stack, &new_op);
bb7cff720dd0 add obj.conf expression parser
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parents: 421
diff changeset
406 parser->expect_value = TRUE;
435
713ec3da79ec expression parser: add support for functions
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diff changeset
407 parser->expect_arg = FALSE;
423
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diff changeset
408 } else if(token.length == 1 && token.ptr[0] == '(') {
435
713ec3da79ec expression parser: add support for functions
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parents: 424
diff changeset
409 ExprOpStackItem *prev_op = NULL;
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parents: 424
diff changeset
410 if(op_stack->size > 0) {
713ec3da79ec expression parser: add support for functions
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parents: 424
diff changeset
411 prev_op = cxListAt(op_stack, op_stack->size - 1);
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parents: 424
diff changeset
412 }
713ec3da79ec expression parser: add support for functions
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parents: 424
diff changeset
413
713ec3da79ec expression parser: add support for functions
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parents: 424
diff changeset
414 if(prev_op && prev_op->operator == NSAPI_EXPRESSION_CALL) {
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parents: 424
diff changeset
415 // function call open parenthesis
713ec3da79ec expression parser: add support for functions
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parents: 424
diff changeset
416 // we don't need to add a new op stack item, just mark function
713ec3da79ec expression parser: add support for functions
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parents: 424
diff changeset
417 // call as open parenthesis
713ec3da79ec expression parser: add support for functions
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parents: 424
diff changeset
418 prev_op->open_parenthesis = TRUE;
713ec3da79ec expression parser: add support for functions
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parents: 424
diff changeset
419 parser->expect_arg = TRUE;
713ec3da79ec expression parser: add support for functions
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parents: 424
diff changeset
420 } else {
713ec3da79ec expression parser: add support for functions
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parents: 424
diff changeset
421 ExprOpStackItem new_op;
713ec3da79ec expression parser: add support for functions
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parents: 424
diff changeset
422 new_op.operator = NSAPI_EXPRESSION_NOOP;
713ec3da79ec expression parser: add support for functions
Olaf Wintermann <olaf.wintermann@gmail.com>
parents: 424
diff changeset
423 new_op.identifier = (cxstring){NULL,0};
713ec3da79ec expression parser: add support for functions
Olaf Wintermann <olaf.wintermann@gmail.com>
parents: 424
diff changeset
424 new_op.expect_value = 0;
713ec3da79ec expression parser: add support for functions
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parents: 424
diff changeset
425 new_op.open_parenthesis = TRUE;
713ec3da79ec expression parser: add support for functions
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parents: 424
diff changeset
426 cxListAdd(op_stack, &new_op);
713ec3da79ec expression parser: add support for functions
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parents: 424
diff changeset
427 }
423
bb7cff720dd0 add obj.conf expression parser
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diff changeset
428 parser->expect_value = TRUE;
bb7cff720dd0 add obj.conf expression parser
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parents: 421
diff changeset
429 } else if(token.length == 1 && token.ptr[0] == ')') {
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parents: 421
diff changeset
430 int found_open_bracket = FALSE;
435
713ec3da79ec expression parser: add support for functions
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parents: 424
diff changeset
431 ExprOpStackItem stack_item;
423
bb7cff720dd0 add obj.conf expression parser
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parents: 421
diff changeset
432 while(op_stack->size > 0) {
435
713ec3da79ec expression parser: add support for functions
Olaf Wintermann <olaf.wintermann@gmail.com>
parents: 424
diff changeset
433 ExprOpStackItem *stack_item_ptr = cxListAt(op_stack, op_stack->size-1);
713ec3da79ec expression parser: add support for functions
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parents: 424
diff changeset
434 stack_item = *stack_item_ptr;
423
bb7cff720dd0 add obj.conf expression parser
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parents: 421
diff changeset
435 cxListRemove(op_stack, op_stack->size-1);
435
713ec3da79ec expression parser: add support for functions
Olaf Wintermann <olaf.wintermann@gmail.com>
parents: 424
diff changeset
436 if(stack_item.open_parenthesis) {
423
bb7cff720dd0 add obj.conf expression parser
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parents: 421
diff changeset
437 found_open_bracket = TRUE;
bb7cff720dd0 add obj.conf expression parser
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parents: 421
diff changeset
438 break;
bb7cff720dd0 add obj.conf expression parser
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parents: 421
diff changeset
439 } else {
435
713ec3da79ec expression parser: add support for functions
Olaf Wintermann <olaf.wintermann@gmail.com>
parents: 424
diff changeset
440 if(expr_add_operator(parser, &stack_item)) {
423
bb7cff720dd0 add obj.conf expression parser
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parents: 421
diff changeset
441 return NULL;
bb7cff720dd0 add obj.conf expression parser
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parents: 421
diff changeset
442 }
bb7cff720dd0 add obj.conf expression parser
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parents: 421
diff changeset
443 }
bb7cff720dd0 add obj.conf expression parser
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parents: 421
diff changeset
444 }
bb7cff720dd0 add obj.conf expression parser
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parents: 421
diff changeset
445 if(!found_open_bracket) {
bb7cff720dd0 add obj.conf expression parser
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446 return NULL;
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447 }
435
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448 if(stack_item.operator == NSAPI_EXPRESSION_CALL) {
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449 if(expr_add_func(parser, &stack_item)) {
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450 return NULL;
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451 }
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452 }
423
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453 parser->expect_value = FALSE;
435
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454 parser->expect_arg = FALSE;
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455 } else if(token_is_identifier(token)) {
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456 ExprOpStackItem new_op;
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457 new_op.operator = NSAPI_EXPRESSION_CALL;
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458 new_op.identifier = token;
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459 new_op.expect_value = 0;
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460 new_op.open_parenthesis = FALSE;
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461 cxListAdd(op_stack, &new_op);
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462 parser->expect_value = FALSE;
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463 parser->expect_arg = FALSE;
423
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464 } else {
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465 if(expr_add_value(parser, token)) {
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466 return NULL;
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467 }
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468 }
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469 }
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470
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471 while(op_stack->size > 0) {
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472 ExprOpStackItem *stack_item = cxListAt(op_stack, op_stack->size-1);
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473 if(stack_item->open_parenthesis) {
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474 return NULL;
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475 }
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476 if(expr_add_operator(parser, stack_item)) {
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477 return NULL;
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478 }
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479 cxListRemove(op_stack, op_stack->size-1);
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480 }
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481
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482 if(ex_stack->size != 1) {
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483 return NULL;
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484 }
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485
437
545010bc5e71 replace linkedlist with arraylist in the expression parser
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486 NSAPIExpression **ret = cxListAt(ex_stack, 0);
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487 return *ret;
423
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488 }
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489
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490 NSAPIExpression* expr_parse_logical_expr(pool_handle_t *pool, CxList *tokens, size_t *pos) {
437
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491 CxList *op_stack = cxArrayListCreate(pool_allocator(pool), cx_cmp_ptr, sizeof(ExprOpStackItem), 32);
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492 CxList *ex_stack = cxArrayListCreate(pool_allocator(pool), cx_cmp_ptr, sizeof(NSAPIExpression*), 32);
423
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493
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494 ExprParser parser;
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495 parser.pool = pool;
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496 parser.op_stack = op_stack;
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497 parser.ex_stack = ex_stack;
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498 parser.tokens = tokens;
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499 parser.pos = pos;
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500 parser.expect_value = TRUE;
435
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501 parser.expect_arg = FALSE;
423
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502
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503 NSAPIExpression *ret = expr_parse_expr(&parser);
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504 cxListDestroy(op_stack);
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505 cxListDestroy(ex_stack);
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506
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507 return ret;
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508 }
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509
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parents: 421
diff changeset
510
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diff changeset
511
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512 int condition_evaluate(Condition *condition, Session *sn, Request *rq) {
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513 return 1;
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514 }

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