include/tool/ip.hpp

#pragma once

#include <sys/types.h>
#include <ifaddrs.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <iostream>
#include <vector>

class INetInfo {
public:
    static std::vector<std::string> getIpv4List() {
        return getIpList();
    }

    static std::vector<std::string> getIpv6List() {
        return getIpList(AF_INET6);
    }
private:
    static std::vector<std::string> getIpList(int ipv4_6 = AF_INET) {
        int ret_val = 0;
        std::vector<std::string> ip_list;

        struct ifaddrs * ifAddrStruct 	= NULL;
        void * tmpAddrPtr 				= NULL;

        // 1.
        ret_val 						= getifaddrs(&ifAddrStruct);
        if (0 != ret_val) {
            ret_val = errno;
            return ip_list;
        }

        // 2.
        std::string str_ipvX;

        int padress_buf_len = 0;
        char addressBuffer[INET6_ADDRSTRLEN] = {0};

        if (AF_INET6 == ipv4_6)
            padress_buf_len = INET6_ADDRSTRLEN;
        else
            padress_buf_len = INET_ADDRSTRLEN;


        while (NULL != ifAddrStruct )
        {
            if (ipv4_6 == ifAddrStruct->ifa_addr->sa_family )
            {
                // is a valid IP4 Address
                tmpAddrPtr = &((struct sockaddr_in *)ifAddrStruct->ifa_addr)->sin_addr;

                inet_ntop(ipv4_6, tmpAddrPtr, addressBuffer, padress_buf_len);
                str_ipvX = std::string(addressBuffer);

                ip_list.push_back(str_ipvX);

                memset(addressBuffer, 0, padress_buf_len);
            }

            ifAddrStruct=ifAddrStruct->ifa_next;
        }

        return ip_list;
    }
};