From: Stefan Fritsch <sf@apache.org>
Date: Mon, 9 Jul 2012 10:58:22 +0000 (+0000)
Subject: Make mod_deflate skip compression if compression is enabled at SSL level.
X-Git-Tag: 2.5.0-alpha~6666
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=f0e99ae874625f7808dc7d223a18d3d08a4dc73e;p=apache

Make mod_deflate skip compression if compression is enabled at SSL level.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1359057 13f79535-47bb-0310-9956-ffa450edef68
---

diff --git a/CHANGES b/CHANGES
index 2fc68fb3b2..9f9ce7a6b5 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,6 +1,9 @@
                                                          -*- coding: utf-8 -*-
 Changes with Apache 2.5.0
 
+  *) mod_deflate: Skip compression if compression is enabled at SSL level.
+     [Stefan Fritsch]
+
   *) mod_ext_filter: Fix error_log spam when input filters are configured.  
      [Joe Orton]
 
diff --git a/modules/filters/mod_deflate.c b/modules/filters/mod_deflate.c
index 0876cb4e31..48d37b1392 100644
--- a/modules/filters/mod_deflate.c
+++ b/modules/filters/mod_deflate.c
@@ -45,6 +45,7 @@
 #include "http_request.h"
 #define APR_WANT_STRFUNC
 #include "apr_want.h"
+#include "mod_ssl.h"
 
 #include "zlib.h"
 
@@ -83,6 +84,7 @@ static const char deflate_magic[2] = { '\037', '\213' };
 #define DEFAULT_MEMLEVEL 9
 #define DEFAULT_BUFFERSIZE 8096
 
+static APR_OPTIONAL_FN_TYPE(ssl_var_lookup) *mod_deflate_ssl_var = NULL;
 
 /* Check whether a request is gzipped, so we can un-gzip it.
  * If a request has multiple encodings, we need the gzip
@@ -419,6 +421,18 @@ static void deflate_check_etag(request_rec *r, const char *transform)
     }
 }
 
+static int have_ssl_compression(request_rec *r)
+{
+    const char *comp;
+    if (mod_deflate_ssl_var == NULL)
+        return 0;
+    comp = mod_deflate_ssl_var(r->pool, r->server, r->connection, r,
+                               "SSL_COMPRESS_METHOD");
+    if (comp == NULL || *comp == '\0' || strcmp(comp, "NULL") == 0)
+        return 0;
+    return 1;
+}
+
 static apr_status_t deflate_out_filter(ap_filter_t *f,
                                        apr_bucket_brigade *bb)
 {
@@ -448,6 +462,14 @@ static apr_status_t deflate_out_filter(ap_filter_t *f,
         char *token;
         const char *encoding;
 
+        if (have_ssl_compression(r)) {
+            ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r,
+                          "Compression enabled at SSL level; not compressing "
+                          "at HTTP level.");
+            ap_remove_output_filter(f);
+            return ap_pass_brigade(f->next, bb);
+        }
+
         /* We have checked above that bb is not empty */
         e = APR_BRIGADE_LAST(bb);
         if (APR_BUCKET_IS_EOS(e)) {
@@ -1474,6 +1496,14 @@ static apr_status_t inflate_out_filter(ap_filter_t *f,
     return APR_SUCCESS;
 }
 
+static int mod_deflate_post_config(apr_pool_t *pconf, apr_pool_t *plog,
+                                   apr_pool_t *ptemp, server_rec *s)
+{
+    mod_deflate_ssl_var = APR_RETRIEVE_OPTIONAL_FN(ssl_var_lookup);
+    return OK;
+}
+
+
 #define PROTO_FLAGS AP_FILTER_PROTO_CHANGE|AP_FILTER_PROTO_CHANGE_LENGTH
 static void register_hooks(apr_pool_t *p)
 {
@@ -1483,6 +1513,7 @@ static void register_hooks(apr_pool_t *p)
                               AP_FTYPE_RESOURCE-1);
     ap_register_input_filter(deflateFilterName, deflate_in_filter, NULL,
                               AP_FTYPE_CONTENT_SET);
+    ap_hook_post_config(mod_deflate_post_config, NULL, NULL, APR_HOOK_MIDDLE);
 }
 
 static const command_rec deflate_filter_cmds[] = {