Basic test for /dev/tun.

Bug: 36902680
Test: rm -rf out/host/linux-x86/vts && make vts -j64 && vts-tradefed run
commandAndExit vts --skip-all-system-status-check --primary-abi-only
--skip-preconditions -l VERBOSE --module VtsKernelTunTest
Change-Id: I1904b13c8a8d73e40db1de55898d52153c12ca88

5 files changed, 187 insertions, 0 deletions

diff --git a/Android.bp b/Android.bp
new file mode 100644
index 00000000..77862666
--- /dev/null
+++ b/Android.bp
@@ -0,0 +1,17 @@
+// Copyright (C) 2017 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//       http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+subdirs = [
+    "api/tun",
+]
diff --git a/api/tun/Android.bp b/api/tun/Android.bp
new file mode 100644
index 00000000..f065de24
--- /dev/null
+++ b/api/tun/Android.bp
@@ -0,0 +1,24 @@
+// Copyright (C) 2017 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//       http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+cc_test {
+    name: "vts_kernel_tun_test",
+    srcs: [
+        "vts_kernel_tun_test.cpp",
+    ],
+    shared_libs: [
+        "libbase",
+    ],
+}
+
diff --git a/api/tun/Android.mk b/api/tun/Android.mk
new file mode 100644
index 00000000..09fc0b14
--- /dev/null
+++ b/api/tun/Android.mk
@@ -0,0 +1,22 @@
+#
+# Copyright (C) 2017 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := VtsKernelTunTest
+include test/vts/tools/build/Android.host_config.mk
diff --git a/api/tun/AndroidTest.xml b/api/tun/AndroidTest.xml
new file mode 100644
index 00000000..87e20c8a
--- /dev/null
+++ b/api/tun/AndroidTest.xml
@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2017 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+<configuration description="Config for VTS VtsKernelTunTest.">
+    <target_preparer class="com.android.compatibility.common.tradefed.targetprep.VtsFilePusher">
+        <option name="abort-on-push-failure" value="false"/>
+        <option name="push-group" value="HostDrivenTest.push"/>
+    </target_preparer>
+    <target_preparer class="com.android.tradefed.targetprep.VtsPythonVirtualenvPreparer"/>
+    <test class="com.android.tradefed.testtype.VtsMultiDeviceTest">
+        <option name="test-module-name" value="VtsKernelTunTest"/>
+        <option name="binary-test-source" value="_32bit::DATA/nativetest/vts_kernel_tun_test/vts_kernel_tun_test" />
+        <option name="binary-test-source" value="_64bit::DATA/nativetest64/vts_kernel_tun_test/vts_kernel_tun_test" />
+        <option name="binary-test-type" value="gtest"/>
+        <option name="test-timeout" value="10m"/>
+    </test>
+</configuration>
diff --git a/api/tun/vts_kernel_tun_test.cpp b/api/tun/vts_kernel_tun_test.cpp
new file mode 100644
index 00000000..701a19d9
--- /dev/null
+++ b/api/tun/vts_kernel_tun_test.cpp
@@ -0,0 +1,95 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <iostream>
+#include <string>
+
+#include <fcntl.h>
+
+#include <android-base/stringprintf.h>
+#include <android-base/unique_fd.h>
+#include <gtest/gtest.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <linux/if.h>
+#include <linux/if_tun.h>
+
+using std::cout;
+using std::endl;
+using std::string;
+using android::base::StringPrintf;
+using android::base::unique_fd;
+
+static const short kTunModes[] = {
+  IFF_TUN,
+  IFF_TAP,
+};
+
+class VtsKernelTunTest : public ::testing::TestWithParam<short> {
+ public:
+  virtual void SetUp() override {
+    tun_device_ = "/dev/tun";
+    uint32_t num = arc4random_uniform(1000);
+    ifr_name_ = StringPrintf("tun%d", num);
+  }
+
+  // Used to initialize tun device.
+  int TunInit(short flags);
+
+  string tun_device_;
+  string ifr_name_;
+  unique_fd fd_;
+};
+
+int VtsKernelTunTest::TunInit(short mode) {
+  struct ifreq ifr = {
+    .ifr_flags = mode,
+  };
+  strncpy(ifr.ifr_name, ifr_name_.c_str(), IFNAMSIZ);
+  int fd = open(tun_device_.c_str(), O_RDWR | O_NONBLOCK);
+  if (fd < 0) {
+    return -1;
+  }
+  if (ioctl(fd, TUNSETIFF, (void *) &ifr) < 0) {
+    close(fd);
+    return -1;
+  }
+  return fd;
+}
+
+// Test opening and closing of a tun interface.
+TEST_P(VtsKernelTunTest, OpenAndClose) {
+  fd_ = unique_fd(TunInit(GetParam()));
+  ASSERT_TRUE(fd_ >= 0);
+}
+
+// Test basic read functionality of a tuen interface.
+TEST_P(VtsKernelTunTest, BasicRead) {
+  fd_ = unique_fd(TunInit(GetParam()));
+  ASSERT_TRUE(fd_ >= 0);
+
+  uint8_t test_output;
+  // Expect no packets available on this interface.
+  ASSERT_TRUE(read(fd_, &test_output, 1) < 0);
+}
+
+INSTANTIATE_TEST_CASE_P(Basic, VtsKernelTunTest,
+                        ::testing::ValuesIn(kTunModes));
+
+int main(int argc, char **argv) {
+  ::testing::InitGoogleTest(&argc, argv);
+  return RUN_ALL_TESTS();
+}