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485
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_http.h>
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10
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11
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12 typedef struct {
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489
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13 ngx_radix_tree_t *tree;
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14 ngx_pool_t *pool;
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15 ngx_array_t values;
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485
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16 } ngx_http_geo_conf_t;
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17
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18
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19 static char *ngx_http_geo_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
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20 static char *ngx_http_geo(ngx_conf_t *cf, ngx_command_t *dummy, void *conf);
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21
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22
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23 static ngx_command_t ngx_http_geo_commands[] = {
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24
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25 { ngx_string("geo"),
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26 NGX_HTTP_MAIN_CONF|NGX_CONF_BLOCK|NGX_CONF_TAKE1,
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27 ngx_http_geo_block,
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28 NGX_HTTP_MAIN_CONF_OFFSET,
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29 0,
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30 NULL },
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31
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32 ngx_null_command
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33 };
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34
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35
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36 static ngx_http_module_t ngx_http_geo_module_ctx = {
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509
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37 NULL, /* preconfiguration */
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38 NULL, /* postconfiguration */
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485
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39
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40 NULL, /* create main configuration */
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41 NULL, /* init main configuration */
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42
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43 NULL, /* create server configuration */
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44 NULL, /* merge server configuration */
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45
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46 NULL, /* create location configuration */
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47 NULL /* merge location configuration */
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48 };
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49
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50
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51 ngx_module_t ngx_http_geo_module = {
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509
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52 NGX_MODULE_V1,
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485
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53 &ngx_http_geo_module_ctx, /* module context */
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54 ngx_http_geo_commands, /* module directives */
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55 NGX_HTTP_MODULE, /* module type */
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541
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56 NULL, /* init master */
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485
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57 NULL, /* init module */
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541
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58 NULL, /* init process */
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59 NULL, /* init thread */
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60 NULL, /* exit thread */
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61 NULL, /* exit process */
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62 NULL, /* exit master */
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63 NGX_MODULE_V1_PADDING
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485
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64 };
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65
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66
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67 static ngx_http_variable_value_t ngx_http_geo_null_value =
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68 { 0, ngx_string("0") };
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69
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70
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71 /* AF_INET only */
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72
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489
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73 static ngx_http_variable_value_t *
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501
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74 ngx_http_geo_variable(ngx_http_request_t *r, uintptr_t data)
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485
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75 {
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501
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76 ngx_radix_tree_t *tree = (ngx_radix_tree_t *) data;
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485
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77
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489
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78 struct sockaddr_in *sin;
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79 ngx_http_variable_value_t *var;
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485
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80
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81 sin = (struct sockaddr_in *) r->connection->sockaddr;
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82
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489
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83 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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84 "http geo started");
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85
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86 var = (ngx_http_variable_value_t *)
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485
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87 ngx_radix32tree_find(tree, ntohl(sin->sin_addr.s_addr));
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489
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88
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89 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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90 "http geo: %V %V", &r->connection->addr_text, &var->text);
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91
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92 return var;
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485
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93 }
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94
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95
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489
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96 static char *
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97 ngx_http_geo_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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485
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98 {
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99 char *rv;
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501
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100 ngx_str_t *value, name;
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485
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101 ngx_conf_t save;
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102 ngx_pool_t *pool;
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103 ngx_radix_tree_t *tree;
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104 ngx_http_geo_conf_t geo;
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105 ngx_http_variable_t *var;
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106
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501
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107 value = cf->args->elts;
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108
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109 name = value[1];
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110
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111 if (name.data[0] != '$') {
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112 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
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113 "\"%V\" variable name should start with '$'",
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114 &value[1]);
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115 } else {
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116 name.len--;
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117 name.data++;
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118 }
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119
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547
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120 var = ngx_http_add_variable(cf, &name, NGX_HTTP_VAR_CHANGABLE);
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501
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121 if (var == NULL) {
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485
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122 return NGX_CONF_ERROR;
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123 }
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124
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501
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125 tree = ngx_radix_tree_create(cf->pool, -1);
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563
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126
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501
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127 if (tree == NULL) {
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485
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128 return NGX_CONF_ERROR;
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129 }
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130
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131 var->handler = ngx_http_geo_variable;
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501
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132 var->data = (uintptr_t) tree;
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485
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133
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134 /*
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135 * create the temporary pool of a huge initial size
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136 * to process quickly a large number of geo lines
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137 */
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138
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501
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139 pool = ngx_create_pool(512 * 1024, cf->log);
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140 if (pool == NULL) {
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485
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141 return NGX_CONF_ERROR;
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142 }
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143
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144 if (ngx_array_init(&geo.values, pool, 512,
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145 sizeof(ngx_http_variable_value_t *)) == NGX_ERROR)
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146 {
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147 ngx_destroy_pool(pool);
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148 return NGX_CONF_ERROR;
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149 }
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150
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151 geo.tree = tree;
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152 geo.pool = cf->pool;
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153
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154 save = *cf;
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155 cf->pool = pool;
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156 cf->ctx = &geo;
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157 cf->handler = ngx_http_geo;
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158 cf->handler_conf = conf;
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159
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160 rv = ngx_conf_parse(cf, NULL);
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161
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162 *cf = save;
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163
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164 ngx_destroy_pool(pool);
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165
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166 if (ngx_radix32tree_find(tree, 0) != NGX_RADIX_NO_VALUE) {
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167 return rv;
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168 }
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169
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170 if (ngx_radix32tree_insert(tree, 0, 0,
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171 (uintptr_t) &ngx_http_geo_null_value) == NGX_ERROR)
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172 {
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173 return NGX_CONF_ERROR;
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174 }
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175
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176 return rv;
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177 }
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178
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179
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180 /* AF_INET only */
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181
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489
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182 static char *
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183 ngx_http_geo(ngx_conf_t *cf, ngx_command_t *dummy, void *conf)
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485
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184 {
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185 ngx_int_t rc, n;
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553
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186 ngx_str_t *value, file;
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485
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187 ngx_uint_t i;
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188 ngx_inet_cidr_t cidrin;
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189 ngx_http_geo_conf_t *geo;
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553
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190 ngx_http_variable_value_t *var, *old, **v;
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485
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191
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192 geo = cf->ctx;
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193
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194 if (cf->args->nelts != 2) {
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195 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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196 "invalid number of the geo parameters");
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197 return NGX_CONF_ERROR;
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198 }
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199
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200 value = cf->args->elts;
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201
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202 if (ngx_strcmp(value[0].data, "include") == 0) {
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203 file = value[1];
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204
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205 if (ngx_conf_full_name(cf->cycle, &file) == NGX_ERROR){
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206 return NGX_CONF_ERROR;
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207 }
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208
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209 ngx_log_debug1(NGX_LOG_DEBUG_CORE, cf->log, 0, "include %s", file.data);
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210
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211 return ngx_conf_parse(cf, &file);
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212 }
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213
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214 if (ngx_strcmp(value[0].data, "default") == 0) {
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215 cidrin.addr = 0;
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216 cidrin.mask = 0;
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217
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218 } else {
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219 if (ngx_ptocidr(&value[0], &cidrin) == NGX_ERROR) {
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220 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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221 "invalid parameter \"%V\"", &value[0]);
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222 return NGX_CONF_ERROR;
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223 }
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224
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225 cidrin.addr = ntohl(cidrin.addr);
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226 cidrin.mask = ntohl(cidrin.mask);
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227 }
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228
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229 n = ngx_atoi(value[1].data, value[1].len);
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230
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231 var = NULL;
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232 v = geo->values.elts;
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233
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234 if (n == NGX_ERROR) {
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235 for (i = 0; i < geo->values.nelts; i++) {
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501
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236 if (v[i]->text.len != value[1].len) {
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237 continue;
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238 }
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239
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240 if (ngx_strncmp(value[1].data, v[i]->text.data, value[1].len) == 0)
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241 {
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485
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242 var = v[i];
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243 break;
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244 }
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245 }
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246
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247 } else {
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248 for (i = 0; i < geo->values.nelts; i++) {
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249 if (v[i]->value == (ngx_uint_t) n) {
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250 var = v[i];
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251 break;
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252 }
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253 }
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254 }
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255
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501
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256 if (var == NULL) {
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485
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257 var = ngx_palloc(geo->pool, sizeof(ngx_http_variable_value_t));
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258 if (var == NULL) {
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259 return NGX_CONF_ERROR;
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260 }
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261
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262 var->text.len = value[1].len;
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501
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263 var->text.data = ngx_pstrdup(geo->pool, &value[1]);
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264 if (var->text.data == NULL) {
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485
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265 return NGX_CONF_ERROR;
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266 }
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267
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268 var->value = (n == NGX_ERROR) ? 0 : n;
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269
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501
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270 v = ngx_array_push(&geo->values);
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271 if (v == NULL) {
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485
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272 return NGX_CONF_ERROR;
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273 }
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274
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275 *v = var;
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276 }
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277
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553
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278 for (i = 2; i; i--) {
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279 rc = ngx_radix32tree_insert(geo->tree, cidrin.addr, cidrin.mask,
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280 (uintptr_t) var);
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281 if (rc == NGX_OK) {
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282 return NGX_CONF_OK;
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283 }
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284
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285 if (rc == NGX_ERROR) {
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286 return NGX_CONF_ERROR;
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287 }
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288
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289 /* rc == NGX_BUSY */
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290
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291 old = (ngx_http_variable_value_t *)
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292 ngx_radix32tree_find(geo->tree, cidrin.addr & cidrin.mask);
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293
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294 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
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295 "duplicate parameter \"%V\", value: \"%V\", "
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296 "old value: \"%V\"",
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297 &value[0], &var->text, &old->text);
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298
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299 rc = ngx_radix32tree_delete(geo->tree, cidrin.addr, cidrin.mask);
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300
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301 if (rc == NGX_ERROR) {
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302 return NGX_CONF_ERROR;
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303 }
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485
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304 }
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305
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553
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306 return NGX_CONF_ERROR;
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485
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307 }
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