1 /* 2 * Copyright (C) 2019 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 #include "common.h" 18 19 #include <android-base/logging.h> 20 21 #include <net/if.h> 22 23 #include <algorithm> 24 25 namespace android::nl { 26 nametoindex(const std::string & ifname)27unsigned int nametoindex(const std::string& ifname) { 28 const auto ifidx = if_nametoindex(ifname.c_str()); 29 if (ifidx != 0) return ifidx; 30 31 if (errno != ENODEV) { 32 PLOG(ERROR) << "if_nametoindex(" << ifname << ") failed"; 33 } 34 return 0; 35 } 36 printableOnly(std::string str)37std::string printableOnly(std::string str) { 38 const auto isInvalid = [](char c) { return !isprint(c); }; 39 std::replace_if(str.begin(), str.end(), isInvalid, '?'); 40 41 return str; 42 } 43 crc16(const Buffer<uint8_t> data,uint16_t crc)44uint16_t crc16(const Buffer<uint8_t> data, uint16_t crc) { 45 for (const auto byte : data.getRaw()) { 46 crc ^= byte; 47 for (unsigned i = 0; i < 8; i++) { 48 if (crc & 1) { 49 crc = (crc >> 1) ^ 0xA001; 50 } else { 51 crc >>= 1; 52 } 53 } 54 } 55 return crc; 56 } 57 58 } // namespace android::nl 59