Move hostapd management logic to libwifi-system

This is the logic that existed in netd, but moved into a mockable
C++ object and formulated to support unittesting the config file
generation.

Bug: 30040724
Test: unit tests pass, data for tests extracted from config files
      generated by existing netd code.
Test: netd continues to be able to set up APs for tethering using
      libwifi-system rather than previous code.
Test: No SELinux policy violations during/after setup.
Test: Can sign in to network backed by hostapd started by netd using
      libwifi-system.

Change-Id: I1156c494fc889a3fdf14182b11c7697d93fdf586

2 files changed, 172 insertions, 0 deletions

diff --git a/libwifi_system/tests/hostapd_manager_unittest.cpp b/libwifi_system/tests/hostapd_manager_unittest.cpp
new file mode 100644
index 000000000..f8ebd995f
--- /dev/null
+++ b/libwifi_system/tests/hostapd_manager_unittest.cpp
@@ -0,0 +1,145 @@
+/*
+ * Copyright (C) 2016, 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 <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+#include <string>
+#include <vector>
+
+#include "wifi_system/hostapd_manager.h"
+
+using std::string;
+using std::vector;
+
+namespace android {
+namespace wifi_system {
+namespace {
+
+const char kTestInterfaceName[] = "foobar0";
+const char kTestSsidStr[] = "helloisitme";
+const char kTestPassphraseStr[] = "yourelookingfor";
+const int kTestChannel = 2;
+
+#define CONFIG_COMMON_PREFIX \
+    "interface=foobar0\n" \
+    "driver=nl80211\n" \
+    "ctrl_interface=/data/misc/wifi/hostapd\n" \
+    "ssid2=68656c6c6f" "6973" "6974" "6d65\n" \
+    "channel=2\n" \
+    "ieee80211n=1\n" \
+    "hw_mode=g\n"
+
+// If you generate your config file with both the test ssid
+// and the test passphrase, you'll get this line in the config.
+#define CONFIG_PSK_LINE \
+    "wpa_psk=dffa36815281e5a6eca1910f254717fa2528681335e3bbec5966d2aa9221a66e\n"
+
+#define CONFIG_WPA_SUFFIX \
+    "wpa=3\n" \
+    "wpa_pairwise=TKIP CCMP\n" \
+    CONFIG_PSK_LINE
+
+#define CONFIG_WPA2_SUFFIX \
+    "wpa=2\n" \
+    "rsn_pairwise=CCMP\n" \
+    CONFIG_PSK_LINE
+
+const char kExpectedOpenConfig[] =
+  CONFIG_COMMON_PREFIX
+  "ignore_broadcast_ssid=0\n"
+  "wowlan_triggers=any\n";
+
+const char kExpectedWpaConfig[] =
+    CONFIG_COMMON_PREFIX
+    "ignore_broadcast_ssid=0\n"
+    "wowlan_triggers=any\n"
+    CONFIG_WPA_SUFFIX;
+
+const char kExpectedWpa2Config[] =
+    CONFIG_COMMON_PREFIX
+    "ignore_broadcast_ssid=0\n"
+    "wowlan_triggers=any\n"
+    CONFIG_WPA2_SUFFIX;
+
+class HostapdManagerTest : public ::testing::Test {
+ protected:
+  string GetConfigForEncryptionType(
+      HostapdManager::EncryptionType encryption_type) {
+    return HostapdManager().CreateHostapdConfig(
+        kTestInterfaceName,
+        cstr2vector(kTestSsidStr),
+        false,  // not hidden
+        kTestChannel,
+        encryption_type,
+        cstr2vector(kTestPassphraseStr));
+  }
+
+  vector<uint8_t> cstr2vector(const char* data) {
+    return vector<uint8_t>(data, data + strlen(data));
+  }
+};  // class HostapdManagerTest
+
+}  // namespace
+
+TEST_F(HostapdManagerTest, GeneratesCorrectOpenConfig) {
+  string config = GetConfigForEncryptionType(
+      HostapdManager::EncryptionType::kOpen);
+  EXPECT_FALSE(config.empty());
+  EXPECT_EQ(kExpectedOpenConfig, config);
+}
+
+TEST_F(HostapdManagerTest, GeneratesCorrectWpaConfig) {
+  string config = GetConfigForEncryptionType(
+      HostapdManager::EncryptionType::kWpa);
+  EXPECT_FALSE(config.empty());
+  EXPECT_EQ(kExpectedWpaConfig, config);
+}
+
+TEST_F(HostapdManagerTest, GeneratesCorrectWpa2Config) {
+  string config = GetConfigForEncryptionType(
+      HostapdManager::EncryptionType::kWpa2);
+  EXPECT_FALSE(config.empty());
+  EXPECT_EQ(kExpectedWpa2Config, config);
+}
+
+TEST_F(HostapdManagerTest, RespectsHiddenSetting) {
+  string config = HostapdManager().CreateHostapdConfig(
+        kTestInterfaceName,
+        cstr2vector(kTestSsidStr),
+        true,
+        kTestChannel,
+        HostapdManager::EncryptionType::kOpen,
+        vector<uint8_t>());
+  EXPECT_FALSE(config.find("ignore_broadcast_ssid=1\n") == string::npos);
+  EXPECT_TRUE(config.find("ignore_broadcast_ssid=0\n") == string::npos);
+}
+
+TEST_F(HostapdManagerTest, CorrectlyInfersHwMode) {
+  string config = HostapdManager().CreateHostapdConfig(
+        kTestInterfaceName,
+        cstr2vector(kTestSsidStr),
+        true,
+        44,
+        HostapdManager::EncryptionType::kOpen,
+        vector<uint8_t>());
+  EXPECT_FALSE(config.find("hw_mode=a\n") == string::npos);
+  EXPECT_TRUE(config.find("hw_mode=g\n") == string::npos);
+}
+
+
+}  // namespace wifi_system
+}  // namespace android
diff --git a/libwifi_system/tests/main.cpp b/libwifi_system/tests/main.cpp
new file mode 100644
index 000000000..51e8dad29
--- /dev/null
+++ b/libwifi_system/tests/main.cpp
@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2016 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 <gtest/gtest.h>
+
+#include <android-base/logging.h>
+
+int main(int argc, char** argv) {
+  ::testing::InitGoogleTest(&argc, argv);
+  // Force ourselves to always log to stderr
+  android::base::InitLogging(argv, android::base::StderrLogger);
+  return RUN_ALL_TESTS();
+}
+