QtNetwork: introduce configure switch to use system proxies by default

This option is opt-in (default: no). When configured with
"-proxies-system-default", Qt automatically picks up the system
proxies.

Change-Id: I8cc002f29587854f448d97117b08c43d8eedec76
Reviewed-by: Shane Kearns <shane.kearns@accenture.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>

configure

@@ -785,6 +785,7 @@ CFG_JAVASCRIPTCORE_JIT=auto
 CFG_PKGCONFIG=auto
 CFG_STACK_PROTECTOR_STRONG=auto
 CFG_SLOG2=auto
+CFG_SYSTEM_PROXIES=no
 
 # Target architecture
 CFG_ARCH=
@@ -1003,6 +1004,14 @@ while [ "$#" -gt 0 ]; do
         VAR=`echo $1 | sed "s,^-\([^-]*\)-.*,\1,"`
         VAL=`echo $1 | sed "s,^-[^-]*-\(.*\),\1,"`
         ;;
+    -system-proxies)
+        VAR=system-proxies
+        VAL=yes
+        ;;
+    -no-system-proxies)
+        VAR=system-proxies
+        VAL=no
+        ;;
     #Qt Builtin/System style options
     -no-*|-system-*|-qt-*)
         VAR=`echo $1 | sed "s,^-[^-]*-\(.*\),\1,"`
@@ -2090,6 +2099,13 @@ while [ "$#" -gt 0 ]; do
             UNKNOWN_OPT=yes
         fi
         ;;
+    system-proxies)
+        if [ "$VAL" = "yes" ] || [ "$VAL" = "no" ]; then
+            CFG_SYSTEM_PROXIES="$VAL"
+        else
+            UNKNOWN_OPT=yes
+        fi
+        ;;
     *)
         UNKNOWN_OPT=yes
         ;;
@@ -3291,6 +3307,9 @@ Additional options:
                           OpenGL ES 2, or regular desktop OpenGL.
                           Use es2 for <api> to override auto-detection.
 
+ *  -no-system-proxies .. Do not use system network proxies by default.
+    -system-proxies ..... Use system network proxies by default.
+
  $GBN  -no-glib ........... Do not compile Glib support.
  $GBY  -glib .............. Compile Glib support.
 EOF
@@ -5454,6 +5473,7 @@ fi
 [ "$CFG_MAC_HARFBUZZ" = "yes" ] && QT_CONFIG="$QT_CONFIG harfbuzz"
 [ "$CFG_XCB" = "yes" ] && QT_CONFIG="$QT_CONFIG xcb"
 [ "$CFG_XINPUT2" = "yes" ] && QT_CONFIG="$QT_CONFIG xinput2"
+[ "$CFG_SYSTEM_PROXIES" = "yes" ] && QT_CONFIG="$QT_CONFIG system-proxies"
 
 [ '!' -z "$DEFINES" ] && QMakeVar add DEFINES "$DEFINES"
 [ '!' -z "$L_FLAGS" ] && QMakeVar add LIBS "$L_FLAGS"
@@ -6235,6 +6255,7 @@ echo "libudev support ........ $CFG_LIBUDEV"
 if [ "$XPLATFORM_QNX" = "yes" ]; then
     echo "SLOG2 support .......... $CFG_SLOG2"
 fi
+echo "Use system proxies ..... $CFG_SYSTEM_PROXIES"
 
 if [ "$CFG_OPENGL" = "desktop" ]; then
     echo "OpenGL support ......... yes (Desktop OpenGL)"

src/network/kernel/qnetworkproxy.cpp

@@ -253,6 +253,9 @@ public:
         , httpSocketEngineHandler(0)
 #endif
     {
+#ifdef QT_USE_SYSTEM_PROXIES
+        setApplicationProxyFactory(new QSystemConfigurationProxyFactory);
+#endif
 #ifndef QT_NO_SOCKS5
         socks5SocketEngineHandler = new QSocks5SocketEngineHandler();
 #endif

src/network/socket/socket.pri

@@ -60,3 +60,7 @@ integrity: {
 
     DEFINES += QT_LOCALSOCKET_TCP
 }
+
+contains(QT_CONFIG, system-proxies) {
+    DEFINES += QT_USE_SYSTEM_PROXIES
+}

tools/configure/configureapp.cpp

@@ -236,6 +236,7 @@ Configure::Configure(int& argc, char** argv)
     dictionary[ "QT_CUPS" ]         = "auto";
     dictionary[ "CFG_GCC_SYSROOT" ] = "yes";
     dictionary[ "SLOG2" ]           = "no";
+    dictionary[ "SYSTEM_PROXIES" ]  = "no";
 
     //Only used when cross compiling.
     dictionary[ "QT_INSTALL_SETTINGS" ] = "/etc/xdg";
@@ -877,6 +878,10 @@ void Configure::parseCmdLine()
             dictionary[ "SLOG2" ] = "no";
         } else if (configCmdLine.at(i) == "-slog2") {
             dictionary[ "SLOG2" ] = "yes";
+        } else if (configCmdLine.at(i) == "-no-system-proxies") {
+            dictionary[ "SYSTEM_PROXIES" ] = "no";
+        } else if (configCmdLine.at(i) == "-system-proxies") {
+            dictionary[ "SYSTEM_PROXIES" ] = "yes";
         }
 
         // Work around compiler nesting limitation
@@ -1682,6 +1687,10 @@ bool Configure::displayHelp()
 
         desc("QT_INSTALL_SETTINGS", "auto", "-sysconfdir <dir>", "Settings used by Qt programs will be looked for in\n<dir>.\n");
 
+        desc("SYSTEM_PROXIES", "yes",  "-system-proxies",    "Use system network proxies by default.");
+        desc("SYSTEM_PROXIES", "no",   "-no-system-proxies", "Do not use system network proxies by default.\n");
+
+
 #if !defined(EVAL)
         desc(                   "-qtnamespace <name>", "Wraps all Qt library code in 'namespace name {...}'.");
         desc(                   "-qtlibinfix <infix>",  "Renames all Qt* libs to Qt*<infix>.\n");
@@ -2560,6 +2569,9 @@ void Configure::generateOutputVars()
     if (dictionary[ "V8SNAPSHOT" ] == "yes")
         qtConfig += "v8snapshot";
 
+    if (dictionary[ "SYSTEM_PROXIES" ] == "yes")
+        qtConfig += "system-proxies";
+
     // Add config levels --------------------------------------------
     QStringList possible_configs = QStringList()
         << "minimal"
@@ -3328,7 +3340,8 @@ void Configure::displayConfig()
     sout << "QtDBus support.............." << dictionary[ "DBUS" ] << endl;
     sout << "QtWidgets module support...." << dictionary[ "WIDGETS" ] << endl;
     sout << "QML debugging..............." << dictionary[ "QML_DEBUG" ] << endl;
-    sout << "DirectWrite support........." << dictionary[ "DIRECTWRITE" ] << endl << endl;
+    sout << "DirectWrite support........." << dictionary[ "DIRECTWRITE" ] << endl;
+    sout << "Use system proxies.........." << dictionary[ "SYSTEM_PROXIES" ] << endl << endl;
 
     sout << "Third Party Libraries:" << endl;
     sout << "    ZLIB support............" << dictionary[ "ZLIB" ] << endl;