util.hpp

#pragma once

#include <unistd.h>
#include "types.hpp"

namespace phosphor
{
namespace network
{

/* @brief converts the given subnet into prefix notation.
 * @param[in] addressFamily - IP address family(AF_INET/AF_INET6).
 * @param[in] mask - Subnet Mask.
 * @returns prefix.
 */
uint8_t toCidr(int addressFamily, const std::string& mask);

/* @brief converts the prefix into subnetmask.
 * @param[in] addressFamily - IP address family(AF_INET/AF_INET6).
 * @param[in] prefix - prefix length.
 * @returns subnet mask.
 */
std::string toMask(int addressFamily, uint8_t prefix);

/* @brief checks that the given ip address is link local or not.
 * @param[in] address - IP address.
 * @returns true if it is linklocal otherwise false.
 */
bool isLinkLocal(const std::string& address);

/* @brief gets the network section of the ip adress.
 * @param[in] addressFamily - IP address family(AF_INET/AF_INET6).
 * @param[in] ipaddress - IP address.
 * @param[in] prefix - prefix length.
 * @returns network section of the ipaddress.
 */
std::string getNetworkID(int addressFamily, const std::string& ipaddress,
                         uint8_t prefix);

/** @brief Get all the interfaces from the system.
 *  @returns list of interface names.
 */
IntfAddrMap getInterfaceAddrs();

} //namespace network

class Descriptor
{
    private:
        /** default value */
        int fd = -1;

    public:
        Descriptor() = delete;
        Descriptor(const Descriptor&) = delete;
        Descriptor& operator=(const Descriptor&) = delete;
        Descriptor(Descriptor&&) = delete;
        Descriptor& operator=(Descriptor &&) = delete;

        Descriptor(int fd) : fd(fd) {}

        ~Descriptor()
        {
            if (fd >= 0)
            {
                close(fd);
            }
        }

        int operator()() const
        {
            return fd;
        }
};

} //namespace phosphor