Benedict Wong | 6c24213 | 2018-11-14 17:53:19 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2018 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #define LOG_NDEBUG 0 |
| 18 | |
| 19 | #define LOG_TAG "TestNetworkServiceJni" |
| 20 | |
| 21 | #include <arpa/inet.h> |
| 22 | #include <errno.h> |
| 23 | #include <fcntl.h> |
| 24 | #include <linux/if.h> |
| 25 | #include <linux/if_tun.h> |
| 26 | #include <linux/ipv6_route.h> |
| 27 | #include <linux/route.h> |
| 28 | #include <netinet/in.h> |
| 29 | #include <stdio.h> |
| 30 | #include <string.h> |
| 31 | #include <sys/ioctl.h> |
| 32 | #include <sys/socket.h> |
| 33 | #include <sys/stat.h> |
| 34 | #include <sys/types.h> |
| 35 | |
| 36 | #include <log/log.h> |
| 37 | |
| 38 | #include "netutils/ifc.h" |
| 39 | |
| 40 | #include "jni.h" |
| 41 | #include <android-base/stringprintf.h> |
| 42 | #include <android-base/unique_fd.h> |
| 43 | #include <nativehelper/JNIHelp.h> |
| 44 | #include <nativehelper/ScopedUtfChars.h> |
| 45 | |
| 46 | namespace android { |
| 47 | |
| 48 | //------------------------------------------------------------------------------ |
| 49 | |
| 50 | static void throwException(JNIEnv* env, int error, const char* action, const char* iface) { |
| 51 | const std::string& msg = |
| 52 | android::base::StringPrintf("Error %s %s: %s", action, iface, strerror(error)); |
| 53 | |
| 54 | jniThrowException(env, "java/lang/IllegalStateException", msg.c_str()); |
| 55 | } |
| 56 | |
| 57 | static int createTunInterface(JNIEnv* env, const char* iface) { |
| 58 | base::unique_fd tun(open("/dev/tun", O_RDWR | O_NONBLOCK)); |
| 59 | ifreq ifr{}; |
| 60 | |
| 61 | // Allocate interface. |
| 62 | ifr.ifr_flags = IFF_TUN | IFF_NO_PI; |
| 63 | strlcpy(ifr.ifr_name, iface, IFNAMSIZ); |
| 64 | if (ioctl(tun.get(), TUNSETIFF, &ifr)) { |
| 65 | throwException(env, errno, "allocating", ifr.ifr_name); |
| 66 | return -1; |
| 67 | } |
| 68 | |
| 69 | // Activate interface using an unconnected datagram socket. |
| 70 | base::unique_fd inet6CtrlSock(socket(AF_INET6, SOCK_DGRAM, 0)); |
| 71 | ifr.ifr_flags = IFF_UP; |
| 72 | |
| 73 | if (ioctl(inet6CtrlSock.get(), SIOCSIFFLAGS, &ifr)) { |
| 74 | throwException(env, errno, "activating", ifr.ifr_name); |
| 75 | return -1; |
| 76 | } |
| 77 | |
| 78 | return tun.release(); |
| 79 | } |
| 80 | |
| 81 | //------------------------------------------------------------------------------ |
| 82 | |
| 83 | static jint create(JNIEnv* env, jobject /* thiz */, jstring jIface) { |
| 84 | ScopedUtfChars iface(env, jIface); |
| 85 | if (!iface.c_str()) { |
| 86 | jniThrowNullPointerException(env, "iface"); |
| 87 | return -1; |
| 88 | } |
| 89 | |
| 90 | int tun = createTunInterface(env, iface.c_str()); |
| 91 | |
| 92 | // Any exceptions will be thrown from the createTunInterface call |
| 93 | return tun; |
| 94 | } |
| 95 | |
| 96 | //------------------------------------------------------------------------------ |
| 97 | |
| 98 | static const JNINativeMethod gMethods[] = { |
| 99 | {"jniCreateTun", "(Ljava/lang/String;)I", (void*)create}, |
| 100 | }; |
| 101 | |
| 102 | int register_android_server_TestNetworkService(JNIEnv* env) { |
| 103 | return jniRegisterNativeMethods(env, "com/android/server/TestNetworkService", gMethods, |
| 104 | NELEM(gMethods)); |
| 105 | } |
| 106 | |
| 107 | }; // namespace android |