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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.
*/
#pragma once
#include <libnl++/Buffer.h>
#include <linux/can.h>
#include <net/if.h>
#include <string>
namespace android::nl {
/**
* Returns the index of a given network interface.
*
* If the syscall to check the index fails with other error than ENODEV, it gets logged and the
* return value indicates the interface doesn't exists.
*
* \param ifname Interface to check
* \return Interface index, or 0 if the interface doesn't exist
*/
unsigned int nametoindex(const std::string& ifname);
/**
* Filter a string against non-printable characters.
*
* Replaces all non-printable characters with '?'.
*
* \param str String to filter.
* \return Filtered string.
*/
std::string printableOnly(std::string str);
/**
* Calculates a (optionally running) CRC16 checksum.
*
* CRC16 isn't a strong checksum, but is good for quick comparison purposes.
* One benefit (and also a drawback too) is that all-zero payloads with any length will
* always have a checksum of 0x0000.
*
* \param data Buffer to calculate checksum for
* \param crc Previous CRC16 value to continue calculating running checksum
* \return CRC16 checksum
*/
uint16_t crc16(const Buffer<uint8_t> data, uint16_t crc = 0);
} // namespace android::nl
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