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/*
* Copyright (C) 2019 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 <poll.h> /* poll */
#include <sys/socket.h>
#include <thread>
#include <android-base/parseint.h>
#include <android-base/unique_fd.h>
#include <gtest/gtest.h>
#include "NetdClient.h"
#include "netdclient_priv.h"
namespace {
// Keep in sync with FrameworkListener.cpp (500, "Command not recognized")
constexpr char NOT_SUPPORT_MSG[] = "500 Command not recognized";
int openDnsProxyFuncStub() {
return -1;
};
typedef int (*DnsOpenProxyType)();
typedef int (*SocketFunctionType)(int, int, int);
DnsOpenProxyType openDnsProxyFuncPtr = openDnsProxyFuncStub;
SocketFunctionType socketFuncPtr = socket;
void serverLoop(int dnsProxyFd) {
while (true) {
pollfd fds[1] = {{.fd = dnsProxyFd, .events = POLLIN}};
enum { SERVERFD = 0 };
int poll_result = TEMP_FAILURE_RETRY(poll(fds, std::size(fds), -1));
ASSERT_GT(poll_result, 0);
if (fds[SERVERFD].revents & POLLERR) return;
if (fds[SERVERFD].revents & POLLIN) {
char buf[4096];
TEMP_FAILURE_RETRY(read(fds[SERVERFD].fd, &buf, sizeof(buf)));
// TODO: verify command
TEMP_FAILURE_RETRY(write(fds[SERVERFD].fd, NOT_SUPPORT_MSG, sizeof(NOT_SUPPORT_MSG)));
}
}
}
void expectAllowNetworkingForProcess() {
// netdClientSocket
android::base::unique_fd ipv4(socketFuncPtr(AF_INET, SOCK_STREAM | SOCK_CLOEXEC, 0)),
ipv6(socketFuncPtr(AF_INET6, SOCK_STREAM | SOCK_CLOEXEC, 0));
EXPECT_LE(3, ipv4);
EXPECT_LE(3, ipv6);
// dns_open_proxy
android::base::unique_fd dnsproxydSocket(openDnsProxyFuncPtr());
EXPECT_LE(3, dnsproxydSocket);
}
void expectNotAllowNetworkingForProcess() {
// netdClientSocket
android::base::unique_fd unixSocket(socketFuncPtr(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0));
EXPECT_LE(3, unixSocket);
android::base::unique_fd ipv4(socketFuncPtr(AF_INET, SOCK_STREAM | SOCK_CLOEXEC, 0));
EXPECT_EQ(-1, ipv4);
EXPECT_EQ(errno, EPERM);
android::base::unique_fd ipv6(socketFuncPtr(AF_INET6, SOCK_STREAM | SOCK_CLOEXEC, 0));
EXPECT_EQ(-1, ipv6);
EXPECT_EQ(errno, EPERM);
// dns_open_proxy
android::base::unique_fd dnsproxydSocket(openDnsProxyFuncPtr());
EXPECT_EQ(-1, dnsproxydSocket);
EXPECT_EQ(errno, EPERM);
}
} // namespace
TEST(NetdClientTest, getNetworkForDnsInternal) {
// Test invalid fd
unsigned dnsNetId = 0;
const int invalidFd = -1;
EXPECT_EQ(-EBADF, getNetworkForDnsInternal(invalidFd, &dnsNetId));
// Test what the client does if the resolver does not support the "getdnsnetid" command.
android::base::unique_fd clientFd, serverFd;
ASSERT_TRUE(android::base::Socketpair(AF_UNIX, &clientFd, &serverFd));
std::thread serverThread = std::thread(serverLoop, serverFd.get());
EXPECT_EQ(-EOPNOTSUPP, getNetworkForDnsInternal(clientFd.get(), &dnsNetId));
clientFd.reset(); // Causes serverLoop() to exit
serverThread.join();
}
TEST(NetdClientTest, getNetworkForDns) {
// Test null input
unsigned* testNull = nullptr;
EXPECT_EQ(-EFAULT, getNetworkForDns(testNull));
}
TEST(NetdClientTest, protectFromVpnBadFd) {
EXPECT_EQ(-EBADF, protectFromVpn(-1));
}
TEST(NetdClientTest, protectFromVpnUnixStream) {
int s = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0);
ASSERT_GE(s, 3);
EXPECT_EQ(-EAFNOSUPPORT, protectFromVpn(s));
close(s);
}
TEST(NetdClientTest, protectFromVpnTcp6) {
int s = socket(AF_INET6, SOCK_STREAM | SOCK_CLOEXEC, 0);
ASSERT_GE(s, 3);
EXPECT_EQ(0, protectFromVpn(s));
close(s);
}
TEST(NetdClientTest, setAllowNetworkingForProcess) {
netdClientInitDnsOpenProxy(&openDnsProxyFuncPtr);
netdClientInitSocket(&socketFuncPtr);
// At the beginning, we should be able to use socket since the default setting is allowing.
expectAllowNetworkingForProcess();
// Disable
setAllowNetworkingForProcess(false);
expectNotAllowNetworkingForProcess();
// Reset
setAllowNetworkingForProcess(true);
expectAllowNetworkingForProcess();
}
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