[nginx] Realip: the $realip_remote_addr variable.

[Vladimir Homutov]

details:   http://hg.nginx.org/nginx/rev/cebe43bace93
branches:  
changeset: 6294:cebe43bace93
user:      Ruslan Ermilov <ru at nginx.com>
date:      Mon Nov 16 16:02:02 2015 +0300
description:
Realip: the $realip_remote_addr variable.

diffstat:

 src/http/modules/ngx_http_realip_module.c |  72 ++++++++++++++++++++++++++++++-
 1 files changed, 71 insertions(+), 1 deletions(-)

diffs (110 lines):

diff -r ec6b07be88a5 -r cebe43bace93 src/http/modules/ngx_http_realip_module.c
--- a/src/http/modules/ngx_http_realip_module.c	Fri Nov 13 20:10:50 2015 +0300
+++ b/src/http/modules/ngx_http_realip_module.c	Mon Nov 16 16:02:02 2015 +0300
@@ -43,9 +43,14 @@ static char *ngx_http_realip(ngx_conf_t 
 static void *ngx_http_realip_create_loc_conf(ngx_conf_t *cf);
 static char *ngx_http_realip_merge_loc_conf(ngx_conf_t *cf,
     void *parent, void *child);
+static ngx_int_t ngx_http_realip_add_variables(ngx_conf_t *cf);
 static ngx_int_t ngx_http_realip_init(ngx_conf_t *cf);
 
 
+static ngx_int_t ngx_http_realip_remote_addr_variable(ngx_http_request_t *r,
+    ngx_http_variable_value_t *v, uintptr_t data);
+
+
 static ngx_command_t  ngx_http_realip_commands[] = {
 
     { ngx_string("set_real_ip_from"),
@@ -75,7 +80,7 @@ static ngx_command_t  ngx_http_realip_co
 
 
 static ngx_http_module_t  ngx_http_realip_module_ctx = {
-    NULL,                                  /* preconfiguration */
+    ngx_http_realip_add_variables,         /* preconfiguration */
     ngx_http_realip_init,                  /* postconfiguration */
 
     NULL,                                  /* create main configuration */
@@ -105,6 +110,15 @@ ngx_module_t  ngx_http_realip_module = {
 };
 
 
+static ngx_http_variable_t  ngx_http_realip_vars[] = {
+
+    { ngx_string("realip_remote_addr"), NULL,
+      ngx_http_realip_remote_addr_variable, 0, 0, 0 },
+
+    { ngx_null_string, NULL, NULL, 0, 0, 0 }
+};
+
+
 static ngx_int_t
 ngx_http_realip_handler(ngx_http_request_t *r)
 {
@@ -417,6 +431,25 @@ ngx_http_realip_merge_loc_conf(ngx_conf_
 
 
 static ngx_int_t
+ngx_http_realip_add_variables(ngx_conf_t *cf)
+{
+    ngx_http_variable_t  *var, *v;
+
+    for (v = ngx_http_realip_vars; v->name.len; v++) {
+        var = ngx_http_add_variable(cf, &v->name, v->flags);
+        if (var == NULL) {
+            return NGX_ERROR;
+        }
+
+        var->get_handler = v->get_handler;
+        var->data = v->data;
+    }
+
+    return NGX_OK;
+}
+
+
+static ngx_int_t
 ngx_http_realip_init(ngx_conf_t *cf)
 {
     ngx_http_handler_pt        *h;
@@ -440,3 +473,40 @@ ngx_http_realip_init(ngx_conf_t *cf)
 
     return NGX_OK;
 }
+
+
+static ngx_int_t
+ngx_http_realip_remote_addr_variable(ngx_http_request_t *r,
+    ngx_http_variable_value_t *v, uintptr_t data)
+{
+    ngx_str_t              *addr_text;
+    ngx_pool_cleanup_t     *cln;
+    ngx_http_realip_ctx_t  *ctx;
+
+    ctx = ngx_http_get_module_ctx(r, ngx_http_realip_module);
+
+    if (ctx == NULL && (r->internal || r->filter_finalize)) {
+
+        /*
+         * if module context was reset, the original address
+         * can still be found in the cleanup handler
+         */
+
+        for (cln = r->pool->cleanup; cln; cln = cln->next) {
+            if (cln->handler == ngx_http_realip_cleanup) {
+                ctx = cln->data;
+                break;
+            }
+        }
+    }
+
+    addr_text = ctx ? &ctx->addr_text : &r->connection->addr_text;
+
+    v->len = addr_text->len;
+    v->valid = 1;
+    v->no_cacheable = 0;
+    v->not_found = 0;
+    v->data = addr_text->data;
+
+    return NGX_OK;
+}