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34
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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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38
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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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138
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16 } ngx_http_geo_conf_ctx_t;
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34
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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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58
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37 NULL, /* preconfiguration */
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38 NULL, /* postconfiguration */
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34
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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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58
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52 NGX_MODULE_V1,
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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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90
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56 NULL, /* init master */
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57 NULL, /* init module */
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90
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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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34
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64 };
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65
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66
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67 /* AF_INET only */
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68
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122
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69 static ngx_int_t
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70 ngx_http_geo_variable(ngx_http_request_t *r, ngx_http_variable_value_t *v,
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71 uintptr_t data)
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72 {
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73 ngx_radix_tree_t *tree = (ngx_radix_tree_t *) data;
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74
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38
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75 struct sockaddr_in *sin;
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122
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76 ngx_http_variable_value_t *vv;
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77
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78 sin = (struct sockaddr_in *) r->connection->sockaddr;
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79
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80 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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81 "http geo started");
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82
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122
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83 vv = (ngx_http_variable_value_t *)
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84 ngx_radix32tree_find(tree, ntohl(sin->sin_addr.s_addr));
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38
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85
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122
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86 *v = *vv;
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87
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88 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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328
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89 "http geo: %V %v", &r->connection->addr_text, v);
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90
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91 return NGX_OK;
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92 }
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93
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94
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38
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95 static char *
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96 ngx_http_geo_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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97 {
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98 char *rv;
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99 ngx_str_t *value, name;
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100 ngx_conf_t save;
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101 ngx_pool_t *pool;
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102 ngx_radix_tree_t *tree;
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328
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103 ngx_http_variable_t *var;
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138
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104 ngx_http_geo_conf_ctx_t ctx;
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105
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106 value = cf->args->elts;
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107
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108 name = value[1];
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109
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110 if (name.data[0] != '$') {
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111 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
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112 "\"%V\" variable name should start with '$'",
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113 &value[1]);
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114 } else {
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115 name.len--;
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116 name.data++;
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117 }
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118
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340
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119 var = ngx_http_add_variable(cf, &name, NGX_HTTP_VAR_CHANGEABLE);
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120 if (var == NULL) {
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121 return NGX_CONF_ERROR;
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122 }
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123
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124 tree = ngx_radix_tree_create(cf->pool, -1);
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112
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125
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126 if (tree == NULL) {
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127 return NGX_CONF_ERROR;
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128 }
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129
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186
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130 var->get_handler = ngx_http_geo_variable;
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131 var->data = (uintptr_t) tree;
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132
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132
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133 pool = ngx_create_pool(16384, cf->log);
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134 if (pool == NULL) {
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135 return NGX_CONF_ERROR;
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136 }
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137
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138
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138 if (ngx_array_init(&ctx.values, pool, 512,
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132
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139 sizeof(ngx_http_variable_value_t *))
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140 != NGX_OK)
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141 {
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142 ngx_destroy_pool(pool);
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143 return NGX_CONF_ERROR;
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144 }
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145
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138
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146 ctx.tree = tree;
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147 ctx.pool = cf->pool;
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148
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149 save = *cf;
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150 cf->pool = pool;
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138
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151 cf->ctx = &ctx;
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152 cf->handler = ngx_http_geo;
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153 cf->handler_conf = conf;
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154
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155 rv = ngx_conf_parse(cf, NULL);
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156
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157 *cf = save;
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158
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159 ngx_destroy_pool(pool);
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160
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161 if (ngx_radix32tree_find(tree, 0) != NGX_RADIX_NO_VALUE) {
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162 return rv;
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163 }
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164
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165 if (ngx_radix32tree_insert(tree, 0, 0,
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126
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166 (uintptr_t) &ngx_http_variable_null_value)
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167 == NGX_ERROR)
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168 {
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169 return NGX_CONF_ERROR;
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170 }
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171
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172 return rv;
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173 }
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174
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175
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176 /* AF_INET only */
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177
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38
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178 static char *
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179 ngx_http_geo(ngx_conf_t *cf, ngx_command_t *dummy, void *conf)
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34
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180 {
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181 ngx_int_t rc;
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102
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182 ngx_str_t *value, file;
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183 ngx_uint_t i;
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184 ngx_inet_cidr_t cidrin;
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185 ngx_http_geo_conf_ctx_t *ctx;
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186 ngx_http_variable_value_t *var, *old, **v;
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187
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188 ctx = cf->ctx;
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189
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190 if (cf->args->nelts != 2) {
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191 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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192 "invalid number of the geo parameters");
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193 return NGX_CONF_ERROR;
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194 }
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195
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196 value = cf->args->elts;
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197
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198 if (ngx_strcmp(value[0].data, "include") == 0) {
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199 file = value[1];
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200
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324
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201 if (ngx_conf_full_name(cf->cycle, &file, 1) == NGX_ERROR){
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202 return NGX_CONF_ERROR;
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203 }
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204
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205 ngx_log_debug1(NGX_LOG_DEBUG_CORE, cf->log, 0, "include %s", file.data);
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206
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207 return ngx_conf_parse(cf, &file);
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208 }
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209
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210 if (ngx_strcmp(value[0].data, "default") == 0) {
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211 cidrin.addr = 0;
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212 cidrin.mask = 0;
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213
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214 } else {
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215 rc = ngx_ptocidr(&value[0], &cidrin);
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216
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217 if (rc == NGX_ERROR) {
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218 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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219 "invalid parameter \"%V\"", &value[0]);
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220 return NGX_CONF_ERROR;
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221 }
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222
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326
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223 if (rc == NGX_DONE) {
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224 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
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225 "low address bits of %V are meaningless",
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226 &value[0]);
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227 }
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228
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229 cidrin.addr = ntohl(cidrin.addr);
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230 cidrin.mask = ntohl(cidrin.mask);
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231 }
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232
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233 var = NULL;
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234 v = ctx->values.elts;
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235
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236 for (i = 0; i < ctx->values.nelts; i++) {
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237 if ((size_t) v[i]->len != value[1].len) {
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238 continue;
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239 }
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240
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241 if (ngx_strncmp(value[1].data, v[i]->data, value[1].len) == 0) {
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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 if (var == NULL) {
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248 var = ngx_palloc(ctx->pool, sizeof(ngx_http_variable_value_t));
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249 if (var == NULL) {
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250 return NGX_CONF_ERROR;
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251 }
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252
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253 var->len = value[1].len;
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254 var->data = ngx_pstrdup(ctx->pool, &value[1]);
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255 if (var->data == NULL) {
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256 return NGX_CONF_ERROR;
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257 }
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258
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122
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259 var->valid = 1;
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260 var->no_cacheable = 0;
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261 var->not_found = 0;
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262
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263 v = ngx_array_push(&ctx->values);
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264 if (v == NULL) {
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265 return NGX_CONF_ERROR;
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266 }
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267
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268 *v = var;
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269 }
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270
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271 for (i = 2; i; i--) {
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272 rc = ngx_radix32tree_insert(ctx->tree, cidrin.addr, cidrin.mask,
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273 (uintptr_t) var);
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274 if (rc == NGX_OK) {
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275 return NGX_CONF_OK;
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276 }
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277
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278 if (rc == NGX_ERROR) {
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279 return NGX_CONF_ERROR;
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280 }
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281
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282 /* rc == NGX_BUSY */
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283
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284 old = (ngx_http_variable_value_t *)
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138
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285 ngx_radix32tree_find(ctx->tree, cidrin.addr & cidrin.mask);
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102
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286
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287 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
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328
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288 "duplicate parameter \"%V\", value: \"%v\", old value: \"%v\"",
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289 &value[0], var, old);
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102
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290
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291 rc = ngx_radix32tree_delete(ctx->tree, cidrin.addr, cidrin.mask);
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102
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292
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293 if (rc == NGX_ERROR) {
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294 return NGX_CONF_ERROR;
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295 }
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296 }
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297
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102
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298 return NGX_CONF_ERROR;
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299 }
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