| /* |
| * Copyright 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 <string> |
| #include <fcntl.h> |
| #include <signal.h> |
| |
| #include <gtest/gtest.h> |
| |
| #define LOG_TAG "IptablesRestoreControllerTest" |
| #include <cutils/log.h> |
| #include <android-base/stringprintf.h> |
| #include <android-base/strings.h> |
| |
| #include "IptablesRestoreController.h" |
| #include "NetdConstants.h" |
| |
| using android::base::Join; |
| using android::base::StringPrintf; |
| |
| class IptablesRestoreControllerTest : public ::testing::Test { |
| public: |
| IptablesRestoreController con; |
| |
| pid_t getIpRestorePid(const IptablesRestoreController::IptablesProcessType type) { |
| return con.getIpRestorePid(type); |
| }; |
| |
| void expectNoIptablesRestoreProcess(pid_t pid) { |
| // We can't readlink /proc/PID/exe, because zombie processes don't have it. |
| // Parse /proc/PID/stat instead. |
| std::string statPath = StringPrintf("/proc/%d/stat", pid); |
| int fd = open(statPath.c_str(), O_RDONLY); |
| if (fd == -1) { |
| // ENOENT means the process is gone (expected). |
| ASSERT_EQ(errno, ENOENT) |
| << "Unexpected error opening " << statPath << ": " << strerror(errno); |
| return; |
| } |
| |
| // If the PID exists, it's possible (though very unlikely) that the PID was reused. Check the |
| // binary name as well, to ensure the test isn't flaky. |
| char statBuf[1024]; |
| ASSERT_NE(-1, read(fd, statBuf, sizeof(statBuf))) |
| << "Could not read from " << statPath << ": " << strerror(errno); |
| close(fd); |
| |
| std::string statString(statBuf); |
| EXPECT_FALSE(statString.find("iptables-restor") || statString.find("ip6tables-resto")) |
| << "Previous iptables-restore pid " << pid << " still alive: " << statString; |
| } |
| }; |
| |
| TEST_F(IptablesRestoreControllerTest, TestBasicCommand) { |
| std::string output; |
| |
| EXPECT_EQ(0, con.execute(IptablesTarget::V4V6, "#Test\n", nullptr)); |
| |
| pid_t pid4 = getIpRestorePid(IptablesRestoreController::IPTABLES_PROCESS); |
| pid_t pid6 = getIpRestorePid(IptablesRestoreController::IP6TABLES_PROCESS); |
| |
| EXPECT_EQ(0, con.execute(IptablesTarget::V6, "#Test\n", nullptr)); |
| EXPECT_EQ(0, con.execute(IptablesTarget::V4, "#Test\n", nullptr)); |
| |
| EXPECT_EQ(0, con.execute(IptablesTarget::V4V6, "#Test\n", &output)); |
| EXPECT_EQ("#Test\n#Test\n", output); // One for IPv4 and one for IPv6. |
| |
| // Check the PIDs are the same as they were before. If they're not, the child processes were |
| // restarted, which causes a 30-60ms delay. |
| EXPECT_EQ(pid4, getIpRestorePid(IptablesRestoreController::IPTABLES_PROCESS)); |
| EXPECT_EQ(pid6, getIpRestorePid(IptablesRestoreController::IP6TABLES_PROCESS)); |
| } |
| |
| TEST_F(IptablesRestoreControllerTest, TestRestartOnMalformedCommand) { |
| std::string buffer; |
| for (int i = 0; i < 50; i++) { |
| IptablesTarget target = (IptablesTarget) (i % 3); |
| std::string *output = (i % 2) ? &buffer : nullptr; |
| ASSERT_EQ(-1, con.execute(target, "malformed command\n", output)) << |
| "Malformed command did not fail at iteration " << i; |
| ASSERT_EQ(0, con.execute(target, "#Test\n", output)) << |
| "No-op command did not succeed at iteration " << i; |
| } |
| } |
| |
| TEST_F(IptablesRestoreControllerTest, TestRestartOnProcessDeath) { |
| std::string output; |
| |
| // Run a command to ensure that the processes are running. |
| EXPECT_EQ(0, con.execute(IptablesTarget::V4V6, "#Test\n", &output)); |
| |
| pid_t pid4 = getIpRestorePid(IptablesRestoreController::IPTABLES_PROCESS); |
| pid_t pid6 = getIpRestorePid(IptablesRestoreController::IP6TABLES_PROCESS); |
| |
| ASSERT_EQ(0, kill(pid4, 0)) << "iptables-restore pid " << pid4 << " does not exist"; |
| ASSERT_EQ(0, kill(pid6, 0)) << "ip6tables-restore pid " << pid6 << " does not exist"; |
| ASSERT_EQ(0, kill(pid4, SIGTERM)) << "Failed to send SIGTERM to iptables-restore pid " << pid4; |
| ASSERT_EQ(0, kill(pid6, SIGTERM)) << "Failed to send SIGTERM to ip6tables-restore pid " << pid6; |
| |
| // Wait 100ms for processes to terminate. |
| TEMP_FAILURE_RETRY(usleep(100 * 1000)); |
| |
| // Ensure that running a new command properly restarts the processes. |
| EXPECT_EQ(0, con.execute(IptablesTarget::V4V6, "#Test\n", nullptr)); |
| EXPECT_NE(pid4, getIpRestorePid(IptablesRestoreController::IPTABLES_PROCESS)); |
| EXPECT_NE(pid6, getIpRestorePid(IptablesRestoreController::IP6TABLES_PROCESS)); |
| |
| // Check there are no zombies. |
| expectNoIptablesRestoreProcess(pid4); |
| expectNoIptablesRestoreProcess(pid6); |
| } |
| |
| TEST_F(IptablesRestoreControllerTest, TestOutput) { |
| const char *chainName = StringPrintf("netd_unit_test_%u", arc4random_uniform(10000)).c_str(); |
| |
| // Create a chain to list. |
| std::vector<std::string> createCommands = { |
| "*filter", |
| StringPrintf(":%s -", chainName), |
| StringPrintf("-A %s -j RETURN", chainName), |
| "COMMIT", |
| "" |
| }; |
| EXPECT_EQ(0, con.execute(V4V6, Join(createCommands, "\n"), nullptr)); |
| |
| // Expected contents of the chain. |
| std::vector<std::string> expectedLines = { |
| StringPrintf("Chain %s (0 references)", chainName), |
| "target prot opt source destination ", |
| "RETURN all -- 0.0.0.0/0 0.0.0.0/0 ", |
| StringPrintf("Chain %s (0 references)", chainName), |
| "target prot opt source destination ", |
| "RETURN all ::/0 ::/0 ", |
| "" |
| }; |
| std::string expected = Join(expectedLines, "\n"); |
| |
| // List and delete the chain. |
| std::vector<std::string> listCommands = { |
| "*filter", |
| StringPrintf("-n -L %s", chainName), // List chain. |
| StringPrintf(":%s -", chainName), // Flush chain (otherwise we can't delete it). |
| StringPrintf("-X %s", chainName), // Delete chain. |
| "COMMIT", |
| "" |
| }; |
| |
| std::string output; |
| EXPECT_EQ(0, con.execute(V4V6, Join(listCommands, "\n"), &output)); |
| EXPECT_EQ(expected, output); |
| } |