Windows - "bypass proxy for local..." also affects IP addresses

If the "bypass proxy for local addresses" option is enabled in
the windows proxy configuration, then do not use the proxy for
any IP address in the subnet of any network interface.

As the systemProxyForQuery api is now offering HTTP proxy tunnels
for TCP sockets, this change avoids local ad-hoc network
connections being routed through the proxy.
In the case where the local address was on a different interface to
the proxy server, it may have been unreachable through the proxy.
For example IP over USB or Bluetooth.

Change-Id: I0842732832a7795112be029d923ed168edc008d6
(modified version of fffc900f78a191970c4eebced9c1af016a9ea6f4 in QtBase)
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

1 files changed, 19 insertions, 2 deletions

diff --git a/src/network/kernel/qnetworkproxy_win.cpp b/src/network/kernel/qnetworkproxy_win.cpp
index 107b2e5..90aae0a 100644
--- a/src/network/kernel/qnetworkproxy_win.cpp
+++ b/src/network/kernel/qnetworkproxy_win.cpp
@@ -47,6 +47,7 @@
 #include <qstringlist.h>
 #include <qregexp.h>
 #include <qurl.h>
+#include <qnetworkinterface.h>
 
 #include <string.h>
 #include <qt_windows.h>
@@ -191,10 +192,26 @@ static bool isBypassed(const QString &host, const QStringList &bypassList)
     QHostAddress ipAddress;
     bool isIpAddress = ipAddress.setAddress(host);
 
+    // always exclude loopback
+    if (isIpAddress && (ipAddress == QHostAddress::LocalHost || ipAddress == QHostAddress::LocalHostIPv6))
+        return true;
+
     // does it match the list of exclusions?
     foreach (const QString &entry, bypassList) {
-        if (isSimple && entry == QLatin1String("<local>"))
-            return true;
+        if (entry == QLatin1String("<local>")) {
+            if (isSimple)
+                return true;
+            if (isIpAddress) {
+                //exclude all local subnets
+                foreach (const QNetworkInterface &iface, QNetworkInterface::allInterfaces()) {
+                    foreach (const QNetworkAddressEntry netaddr, iface.addressEntries()) {
+                        if (ipAddress.isInSubnet(netaddr.ip(), netaddr.prefixLength())) {
+                            return true;
+                        }
+                    }
+                }
+            }
+        }
         if (isIpAddress && ipAddress.isInSubnet(QHostAddress::parseSubnet(entry))) {
             return true;        // excluded
         } else {