Fix crash when trying to connect to an IPv6 IP via a SOCKS4 proxy.

net/socket/socks_client_socket_unittest.cc

Index: net/socket/socks_client_socket_unittest.cc
diff --git a/net/socket/socks_client_socket_unittest.cc b/net/socket/socks_client_socket_unittest.cc
index f361244feff01a7dfa3138a7bc4ded1f36b13e29..c8032e694b7a240a51148169c1528314e729d543 100644
--- a/net/socket/socks_client_socket_unittest.cc
+++ b/net/socket/socks_client_socket_unittest.cc
@@ -10,6 +10,7 @@
 #include "net/base/net_log_unittest.h"
 #include "net/base/test_completion_callback.h"
 #include "net/base/winsock_init.h"
+#include "net/dns/host_resolver.h"
 #include "net/dns/mock_host_resolver.h"
 #include "net/socket/client_socket_factory.h"
 #include "net/socket/socket_test_util.h"
@@ -414,4 +415,36 @@ TEST_F(SOCKSClientSocketTest, DisconnectWhileHostResolveInProgress) {
   EXPECT_FALSE(user_sock_->IsConnectedAndIdle());
 }
 
+// Tries to connect to an IPv6 IP.  Should fail, as SOCKS4 does not support
+// IPv6.
+TEST_F(SOCKSClientSocketTest, NoIPv6) {
+  const char kHostName[] = "::1";
+
+  user_sock_ = BuildMockSocket(NULL, 0,
+                               NULL, 0,
+                               host_resolver_.get(),
+                               kHostName, 80,
+                               NULL);
+
+  EXPECT_EQ(ERR_NAME_NOT_RESOLVED,
+            callback_.GetResult(user_sock_->Connect(callback_.callback())));
+}
+
+// Same as above, but with a real resolver, to protect against regressions.
+TEST_F(SOCKSClientSocketTest, NoIPv6RealResolver) {
+  const char kHostName[] = "::1";
+
+  scoped_ptr<HostResolver> host_resolver(
+      HostResolver::CreateSystemResolver(HostResolver::Options(), NULL));
+
+  user_sock_ = BuildMockSocket(NULL, 0,
+                               NULL, 0,
+                               host_resolver.get(),
+                               kHostName, 80,
+                               NULL);
+
+  EXPECT_EQ(ERR_NAME_NOT_RESOLVED,
+            callback_.GetResult(user_sock_->Connect(callback_.callback())));
+}
+
 }  // namespace net