本機のIPアドレス［JavaScript/Node.js］を取得します.

 

function getYourIP(){
        
    const RTCPeerConnection = window.RTCPeerConnection || window.webkitRTCPeerConnection || window.mozRTCPeerConnection;
        
    if (RTCPeerConnection) (function(){
        const rtc = new RTCPeerConnection({iceServers: []});
                
        if (1 || window.mozRTCPeerConnection){
            rtc.createDataChannel('', {reliable: false});
        }
                
        rtc.onicecandidate = function(evt){
            if (evt.candidate) grepSDP(`a=${evt.candidate.candidate}`);
        };
                
        rtc.createOffer(function(offerDesc){
            grepSDP(offerDesc.sdp);
            rtc.setLocalDescription(offerDesc);
        }, function(e) {
                    console.warn('offer failed', e);
                });
                
        const addrs = Object.create(null);
        addrs['0.0.0.0'] = false;
                
        function updateDisplay(newAddr){
            if (newAddr in addrs) return;
            addrs[newAddr] = true;
            const displayAddrs = Object.keys(addrs).filter(function(k) {return addrs[k];});
            for (let i = 0; i < displayAddrs.length; i++){
                if (displayAddrs[i].length > 16){
                    displayAddrs.splice(i, 1);
                    i--;
                }
            }
            console.info('  IP: ', displayAddrs[0]);
        }
                
        function grepSDP(sdp){
            sdp.split('\r
').forEach(function(line, index, arr){
                if (~line.indexOf('a=candidate')){
                    const parts = line.split(' '),
                        addr = parts[4],
                        type = parts[7];
                    if (type === 'host') updateDisplay(addr);
                } else if (~line.indexOf('c=')){
                    const parts = line.split(' '),
                        addr = parts[2];
                    updateDisplay(addr);
                }
            });
        }
    })();
    else {
        console.warn('        ：chrome,firefox,opera,safari');
    }
}

const os = require('os');
module.exports ={
    getLocalIP : function(){
        const eth0 = os.networkInterfaces().eth0;
        let localhost = null;
        for (let i = 0; i < eth0.length; i++){
            if (eth0[i].family == 'IPv4'){
                localhost = eth0[i].address;
            }
        }
        return localhost;
    }
};