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/*
* Copyright (C) Igor Sysoev
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
typedef struct {
ngx_radix_tree_t *tree;
ngx_pool_t *pool;
ngx_array_t values;
} ngx_http_geo_conf_t;
static char *ngx_http_geo_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
static char *ngx_http_geo(ngx_conf_t *cf, ngx_command_t *dummy, void *conf);
static ngx_command_t ngx_http_geo_commands[] = {
{ ngx_string("geo"),
NGX_HTTP_MAIN_CONF|NGX_CONF_BLOCK|NGX_CONF_TAKE1,
ngx_http_geo_block,
NGX_HTTP_MAIN_CONF_OFFSET,
0,
NULL },
ngx_null_command
};
static ngx_http_module_t ngx_http_geo_module_ctx = {
NULL, /* pre conf */
NULL, /* create main configuration */
NULL, /* init main configuration */
NULL, /* create server configuration */
NULL, /* merge server configuration */
NULL, /* create location configuration */
NULL /* merge location configuration */
};
ngx_module_t ngx_http_geo_module = {
NGX_MODULE,
&ngx_http_geo_module_ctx, /* module context */
ngx_http_geo_commands, /* module directives */
NGX_HTTP_MODULE, /* module type */
NULL, /* init module */
NULL /* init process */
};
static ngx_http_variable_value_t ngx_http_geo_null_value =
{ 0, ngx_string("0") };
/* AF_INET only */
static ngx_http_variable_value_t *
ngx_http_geo_variable(ngx_http_request_t *r, void *data)
{
ngx_radix_tree_t *tree = data;
struct sockaddr_in *sin;
ngx_http_variable_value_t *var;
sin = (struct sockaddr_in *) r->connection->sockaddr;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http geo started");
var = (ngx_http_variable_value_t *)
ngx_radix32tree_find(tree, ntohl(sin->sin_addr.s_addr));
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http geo: %V %V", &r->connection->addr_text, &var->text);
return var;
}
static char *
ngx_http_geo_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
char *rv;
ngx_str_t *value;
ngx_conf_t save;
ngx_pool_t *pool;
ngx_radix_tree_t *tree;
ngx_http_geo_conf_t geo;
ngx_http_variable_t *var;
if (!(var = ngx_http_add_variable(cf))) {
return NGX_CONF_ERROR;
}
if (!(tree = ngx_radix_tree_create(cf->pool, -1))) {
return NGX_CONF_ERROR;
}
value = cf->args->elts;
var->name = value[1];
var->handler = ngx_http_geo_variable;
var->data = tree;
/*
* create the temporary pool of a huge initial size
* to process quickly a large number of geo lines
*/
if (!(pool = ngx_create_pool(512 * 1024, cf->log))) {
return NGX_CONF_ERROR;
}
if (ngx_array_init(&geo.values, pool, 512,
sizeof(ngx_http_variable_value_t *)) == NGX_ERROR)
{
ngx_destroy_pool(pool);
return NGX_CONF_ERROR;
}
geo.tree = tree;
geo.pool = cf->pool;
save = *cf;
cf->pool = pool;
cf->ctx = &geo;
cf->handler = ngx_http_geo;
cf->handler_conf = conf;
rv = ngx_conf_parse(cf, NULL);
*cf = save;
ngx_destroy_pool(pool);
if (ngx_radix32tree_find(tree, 0) != NGX_RADIX_NO_VALUE) {
return rv;
}
if (ngx_radix32tree_insert(tree, 0, 0,
(uintptr_t) &ngx_http_geo_null_value) == NGX_ERROR)
{
return NGX_CONF_ERROR;
}
return rv;
}
/* AF_INET only */
static char *
ngx_http_geo(ngx_conf_t *cf, ngx_command_t *dummy, void *conf)
{
ngx_int_t rc, n;
ngx_uint_t i;
ngx_str_t *value, file;
ngx_inet_cidr_t cidrin;
ngx_http_geo_conf_t *geo;
ngx_http_variable_value_t *var, **v;
geo = cf->ctx;
if (cf->args->nelts != 2) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid number of the geo parameters");
return NGX_CONF_ERROR;
}
value = cf->args->elts;
if (ngx_strcmp(value[0].data, "include") == 0) {
file = value[1];
if (ngx_conf_full_name(cf->cycle, &file) == NGX_ERROR){
return NGX_CONF_ERROR;
}
ngx_log_debug1(NGX_LOG_DEBUG_CORE, cf->log, 0, "include %s", file.data);
return ngx_conf_parse(cf, &file);
}
if (ngx_strcmp(value[0].data, "default") == 0) {
cidrin.addr = 0;
cidrin.mask = 0;
} else {
if (ngx_ptocidr(&value[0], &cidrin) == NGX_ERROR) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid parameter \"%V\"", &value[0]);
return NGX_CONF_ERROR;
}
cidrin.addr = ntohl(cidrin.addr);
cidrin.mask = ntohl(cidrin.mask);
}
n = ngx_atoi(value[1].data, value[1].len);
var = NULL;
v = geo->values.elts;
if (n == NGX_ERROR) {
for (i = 0; i < geo->values.nelts; i++) {
if (ngx_strcmp(value[1].data, v[i]->text.data) == 0) {
var = v[i];
break;
}
}
} else {
for (i = 0; i < geo->values.nelts; i++) {
if (v[i]->value == (ngx_uint_t) n) {
var = v[i];
break;
}
}
}
if (i == geo->values.nelts) {
var = ngx_palloc(geo->pool, sizeof(ngx_http_variable_value_t));
if (var == NULL) {
return NGX_CONF_ERROR;
}
var->text.len = value[1].len;
if (!(var->text.data = ngx_pstrdup(geo->pool, &value[1]))) {
return NGX_CONF_ERROR;
}
var->value = (n == NGX_ERROR) ? 0 : n;
if (!(v = ngx_array_push(&geo->values))) {
return NGX_CONF_ERROR;
}
*v = var;
}
rc = ngx_radix32tree_insert(geo->tree, cidrin.addr, cidrin.mask,
(uintptr_t) var);
if (rc == NGX_ERROR) {
return NGX_CONF_ERROR;
}
if (rc == NGX_BUSY) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "duplicate parameter \"%V\"",
&value[0]);
return NGX_CONF_ERROR;
}
return NGX_CONF_OK;
}
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