src/http/modules/ngx_http_geo_module.c

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