From b7a8f2a08f6a2f777de5e0cef85aed615a9f057d Mon Sep 17 00:00:00 2001
From: Vladimir Homutov <vl@nginx.com>
Date: Tue, 16 Jun 2015 23:28:38 +0300
Subject: [PATCH] Disabled duplicate http, mail, and stream blocks.

Such configurations have very limited use, introduce various problems and
are not officially supported.
---
 src/http/ngx_http.c     | 4 ++++
 src/mail/ngx_mail.c     | 4 ++++
 src/stream/ngx_stream.c | 4 ++++
 3 files changed, 12 insertions(+)

diff --git a/src/http/ngx_http.c b/src/http/ngx_http.c
index 4642559ea..6b0a48f26 100644
--- a/src/http/ngx_http.c
+++ b/src/http/ngx_http.c
@@ -128,6 +128,10 @@ ngx_http_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
     ngx_http_core_srv_conf_t   **cscfp;
     ngx_http_core_main_conf_t   *cmcf;
 
+    if (*(ngx_http_conf_ctx_t **) conf) {
+        return "is duplicate";
+    }
+
     /* the main http context */
 
     ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_conf_ctx_t));
diff --git a/src/mail/ngx_mail.c b/src/mail/ngx_mail.c
index 38664bc87..962ae8be5 100644
--- a/src/mail/ngx_mail.c
+++ b/src/mail/ngx_mail.c
@@ -76,6 +76,10 @@ ngx_mail_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
     ngx_mail_core_srv_conf_t   **cscfp;
     ngx_mail_core_main_conf_t   *cmcf;
 
+    if (*(ngx_mail_conf_ctx_t **) conf) {
+        return "is duplicate";
+    }
+
     /* the main mail context */
 
     ctx = ngx_pcalloc(cf->pool, sizeof(ngx_mail_conf_ctx_t));
diff --git a/src/stream/ngx_stream.c b/src/stream/ngx_stream.c
index 3dce35ab7..f0aa532b6 100644
--- a/src/stream/ngx_stream.c
+++ b/src/stream/ngx_stream.c
@@ -76,6 +76,10 @@ ngx_stream_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
     ngx_stream_core_srv_conf_t   **cscfp;
     ngx_stream_core_main_conf_t   *cmcf;
 
+    if (*(ngx_stream_conf_ctx_t **) conf) {
+        return "is duplicate";
+    }
+
     /* the main stream context */
 
     ctx = ngx_pcalloc(cf->pool, sizeof(ngx_stream_conf_ctx_t));