/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_NDEBUG 0
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#define LOG_TAG "TestNetworkServiceJni"
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#include <arpa/inet.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <linux/if.h>
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#include <linux/if_tun.h>
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#include <linux/ipv6_route.h>
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#include <linux/route.h>
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#include <netinet/in.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <log/log.h>
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#include "netutils/ifc.h"
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#include "jni.h"
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#include <android-base/stringprintf.h>
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#include <android-base/unique_fd.h>
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#include <nativehelper/JNIHelp.h>
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#include <nativehelper/ScopedUtfChars.h>
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namespace android {
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//------------------------------------------------------------------------------
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static void throwException(JNIEnv* env, int error, const char* action, const char* iface) {
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const std::string& msg =
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android::base::StringPrintf("Error %s %s: %s", action, iface, strerror(error));
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jniThrowException(env, "java/lang/IllegalStateException", msg.c_str());
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}
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static int createTunTapInterface(JNIEnv* env, bool isTun, const char* iface) {
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base::unique_fd tun(open("/dev/tun", O_RDWR | O_NONBLOCK));
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ifreq ifr{};
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// Allocate interface.
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ifr.ifr_flags = (isTun ? IFF_TUN : IFF_TAP) | IFF_NO_PI;
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strlcpy(ifr.ifr_name, iface, IFNAMSIZ);
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if (ioctl(tun.get(), TUNSETIFF, &ifr)) {
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throwException(env, errno, "allocating", ifr.ifr_name);
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return -1;
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}
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// Activate interface using an unconnected datagram socket.
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base::unique_fd inet6CtrlSock(socket(AF_INET6, SOCK_DGRAM, 0));
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ifr.ifr_flags = IFF_UP;
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if (ioctl(inet6CtrlSock.get(), SIOCSIFFLAGS, &ifr)) {
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throwException(env, errno, "activating", ifr.ifr_name);
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return -1;
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}
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return tun.release();
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}
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//------------------------------------------------------------------------------
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static jint create(JNIEnv* env, jobject /* thiz */, jboolean isTun, jstring jIface) {
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ScopedUtfChars iface(env, jIface);
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if (!iface.c_str()) {
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jniThrowNullPointerException(env, "iface");
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return -1;
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}
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int tun = createTunTapInterface(env, isTun, iface.c_str());
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// Any exceptions will be thrown from the createTunTapInterface call
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return tun;
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}
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//------------------------------------------------------------------------------
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static const JNINativeMethod gMethods[] = {
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{"jniCreateTunTap", "(ZLjava/lang/String;)I", (void*)create},
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};
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int register_android_server_TestNetworkService(JNIEnv* env) {
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return jniRegisterNativeMethods(env, "com/android/server/TestNetworkService", gMethods,
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NELEM(gMethods));
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}
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}; // namespace android
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