95 lines
2.7 KiB
C++
95 lines
2.7 KiB
C++
/*
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* Copyright 2017 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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* tun_interface.cpp - creates tun interfaces for testing purposes
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*/
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#include <fcntl.h>
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#include <netdb.h>
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#include <stdlib.h>
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#include <unistd.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 <linux/if.h>
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#include <linux/if_tun.h>
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#include <android-base/stringprintf.h>
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#include <android-base/strings.h>
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#include <netutils/ifc.h>
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#include "tun_interface.h"
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#define TUN_DEV "/dev/tun"
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using android::base::StringPrintf;
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namespace android {
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namespace net {
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int TunInterface::init() {
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// Generate a random ULA address pair.
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arc4random_buf(&mSrcAddr, sizeof(mSrcAddr));
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mSrcAddr.s6_addr[0] = 0xfd;
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memcpy(&mDstAddr, &mSrcAddr, sizeof(mDstAddr));
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mDstAddr.s6_addr[15] ^= 1;
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// Convert the addresses to strings because that's what ifc_add_address takes.
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char srcStr[INET6_ADDRSTRLEN], dstStr[INET6_ADDRSTRLEN];
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sockaddr_in6 src6 = { .sin6_family = AF_INET6, .sin6_addr = mSrcAddr, };
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sockaddr_in6 dst6 = { .sin6_family = AF_INET6, .sin6_addr = mDstAddr, };
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int flags = NI_NUMERICHOST;
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if (getnameinfo((sockaddr *) &src6, sizeof(src6), srcStr, sizeof(srcStr), NULL, 0, flags) ||
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getnameinfo((sockaddr *) &dst6, sizeof(dst6), dstStr, sizeof(dstStr), NULL, 0, flags)) {
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return -EINVAL;
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}
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// Create a tun interface with a name based on our PID.
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mIfName = StringPrintf("netdtest%u", getpid());
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struct ifreq ifr = {
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.ifr_ifru = { .ifru_flags = IFF_TUN },
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};
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snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s", mIfName.c_str());
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mFd = open(TUN_DEV, O_RDWR | O_NONBLOCK | O_CLOEXEC);
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if (mFd == -1) return -errno;
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int ret = ioctl(mFd, TUNSETIFF, &ifr, sizeof(ifr));
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if (ret == -1) {
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ret = -errno;
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close(mFd);
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return ret;
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}
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if (ifc_add_address(ifr.ifr_name, srcStr, 64) ||
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ifc_add_address(ifr.ifr_name, dstStr, 64)) {
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ret = -errno;
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close(mFd);
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return ret;
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}
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return 0;
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}
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void TunInterface::destroy() {
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if (mFd != -1) {
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close(mFd);
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mFd = -1;
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}
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}
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} // namespace net
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} // namespace android
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