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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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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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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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37 NULL, /* pre conf */
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38
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39 NULL, /* create main configuration */
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40 NULL, /* init main configuration */
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41
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42 NULL, /* create server configuration */
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43 NULL, /* merge server configuration */
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44
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45 NULL, /* create location configuration */
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46 NULL /* merge location configuration */
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47 };
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48
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49
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50 ngx_module_t ngx_http_geo_module = {
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51 NGX_MODULE,
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52 &ngx_http_geo_module_ctx, /* module context */
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53 ngx_http_geo_commands, /* module directives */
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54 NGX_HTTP_MODULE, /* module type */
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55 NULL, /* init module */
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56 NULL /* init process */
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57 };
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58
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59
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60 static ngx_http_variable_value_t ngx_http_geo_null_value =
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61 { 0, ngx_string("0") };
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62
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63
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64 /* AF_INET only */
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65
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66 static ngx_http_variable_value_t *ngx_http_geo_variable(ngx_http_request_t *r,
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67 void *data)
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68 {
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69 ngx_radix_tree_t *tree = data;
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70
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71 struct sockaddr_in *sin;
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72
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73 sin = (struct sockaddr_in *) r->connection->sockaddr;
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74
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75 return (ngx_http_variable_value_t *)
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76 ngx_radix32tree_find(tree, ntohl(sin->sin_addr.s_addr));
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77 }
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78
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79
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80 static char *ngx_http_geo_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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81 {
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82 char *rv;
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83 ngx_str_t *value;
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84 ngx_conf_t save;
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85 ngx_pool_t *pool;
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86 ngx_radix_tree_t *tree;
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87 ngx_http_geo_conf_t geo;
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88 ngx_http_variable_t *var;
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89
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90 if (!(var = ngx_http_add_variable(cf))) {
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91 return NGX_CONF_ERROR;
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92 }
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93
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94 if (!(tree = ngx_radix_tree_create(cf->pool))) {
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95 return NGX_CONF_ERROR;
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96 }
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97
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98 value = cf->args->elts;
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99
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100 var->name = value[1];
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101 var->handler = ngx_http_geo_variable;
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102 var->data = tree;
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103
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104 /*
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105 * create the temporary pool of a huge initial size
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106 * to process quickly a large number of geo lines
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107 */
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108
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109 if (!(pool = ngx_create_pool(512 * 1024, cf->log))) {
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110 return NGX_CONF_ERROR;
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111 }
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112
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113 if (ngx_array_init(&geo.values, pool, 512,
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114 sizeof(ngx_http_variable_value_t *)) == NGX_ERROR)
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115 {
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116 ngx_destroy_pool(pool);
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117 return NGX_CONF_ERROR;
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118 }
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119
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120 geo.tree = tree;
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121 geo.pool = cf->pool;
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122
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123 save = *cf;
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124 cf->pool = pool;
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125 cf->ctx = &geo;
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126 cf->handler = ngx_http_geo;
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127 cf->handler_conf = conf;
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128
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129 rv = ngx_conf_parse(cf, NULL);
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130
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131 *cf = save;
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132
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133 ngx_destroy_pool(pool);
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134
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135 if (ngx_radix32tree_find(tree, 0) != NGX_RADIX_NO_VALUE) {
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136 return rv;
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137 }
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138
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139 if (ngx_radix32tree_insert(tree, 0, 0,
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140 (uintptr_t) &ngx_http_geo_null_value) == NGX_ERROR)
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141 {
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142 return NGX_CONF_ERROR;
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143 }
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144
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145 return rv;
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146 }
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147
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148
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149 /* AF_INET only */
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150
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151 static char *ngx_http_geo(ngx_conf_t *cf, ngx_command_t *dummy, void *conf)
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152 {
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153 ngx_int_t rc, n;
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154 ngx_uint_t i;
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155 ngx_str_t *value, file;
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156 ngx_inet_cidr_t cidrin;
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157 ngx_http_geo_conf_t *geo;
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158 ngx_http_variable_value_t *var, **v;
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159
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160 geo = cf->ctx;
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161
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162 if (cf->args->nelts != 2) {
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163 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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164 "invalid number of the geo parameters");
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165 return NGX_CONF_ERROR;
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166 }
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167
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168 value = cf->args->elts;
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169
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170 if (ngx_strcmp(value[0].data, "include") == 0) {
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171 file = value[1];
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172
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173 if (ngx_conf_full_name(cf->cycle, &file) == NGX_ERROR){
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174 return NGX_CONF_ERROR;
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175 }
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176
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177 ngx_log_debug1(NGX_LOG_DEBUG_CORE, cf->log, 0, "include %s", file.data);
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178
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179 return ngx_conf_parse(cf, &file);
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180 }
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181
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182 if (ngx_strcmp(value[0].data, "default") == 0) {
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183 cidrin.addr = 0;
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184 cidrin.mask = 0;
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185
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186 } else {
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187 if (ngx_ptocidr(&value[0], &cidrin) == NGX_ERROR) {
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188 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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189 "invalid parameter \"%V\"", &value[0]);
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190 return NGX_CONF_ERROR;
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191 }
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192
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193 cidrin.addr = ntohl(cidrin.addr);
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194 cidrin.mask = ntohl(cidrin.mask);
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195 }
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196
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197 n = ngx_atoi(value[1].data, value[1].len);
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198
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199 var = NULL;
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200 v = geo->values.elts;
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201
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202 if (n == NGX_ERROR) {
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203 for (i = 0; i < geo->values.nelts; i++) {
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204 if (ngx_strcmp(value[1].data, v[i]->text.data) == 0) {
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205 var = v[i];
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206 break;
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207 }
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208 }
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209
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210 } else {
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211 for (i = 0; i < geo->values.nelts; i++) {
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212 if (v[i]->value == (ngx_uint_t) n) {
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213 var = v[i];
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214 break;
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215 }
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216 }
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217 }
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218
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219 if (i == geo->values.nelts) {
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220 var = ngx_palloc(geo->pool, sizeof(ngx_http_variable_value_t));
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221 if (var == NULL) {
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222 return NGX_CONF_ERROR;
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223 }
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224
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225 var->text.len = value[1].len;
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226 if (!(var->text.data = ngx_pstrdup(geo->pool, &value[1]))) {
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227 return NGX_CONF_ERROR;
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228 }
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229
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230 var->value = (n == NGX_ERROR) ? 0 : n;
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231
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232 if (!(v = ngx_array_push(&geo->values))) {
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233 return NGX_CONF_ERROR;
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234 }
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235
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236 *v = var;
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237 }
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238
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239 rc = ngx_radix32tree_insert(geo->tree, cidrin.addr, cidrin.mask,
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240 (uintptr_t) var);
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241 if (rc == NGX_ERROR) {
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242 return NGX_CONF_ERROR;
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243 }
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244
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245 if (rc == NGX_BUSY) {
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246 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "duplicate parameter \"%V\"",
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247 &value[0]);
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248 return NGX_CONF_ERROR;
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249 }
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250
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251 return NGX_CONF_OK;
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252 }
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