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linux-dhcp.js
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1/*
2Copyright 2021 Intel Corporation
3
4Licensed under the Apache License, Version 2.0 (the "License");
5you may not use this file except in compliance with the License.
6You may obtain a copy of the License at
7
8 http://www.apache.org/licenses/LICENSE-2.0
9
10Unless required by applicable law or agreed to in writing, software
11distributed under the License is distributed on an "AS IS" BASIS,
12WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13See the License for the specific language governing permissions and
14limitations under the License.
15
16* @description Mini DHCP Client Module, to fetch configuration data
17* @author Bryan Roe & Ylian Saint-Hilaire
18*/
19
20// DHCP Information
21if (Function.prototype.internal == null) { Object.defineProperty(Function.prototype, 'internal', { get: function () { return (this); } }); }
22if (global._hide == null)
23{
24 global._hide = function _hide(v)
25 {
26 if(v==null || (v!=null && typeof(v)=='boolean'))
27 {
28 var ret = _hide.currentObject;
29 if (v) { _hide.currentObject = null; }
30 return (ret);
31 }
32 else
33 {
34 _hide.currentObject = v;
35 }
36 }
37}
38addModule('promise2', Buffer.from('/*
Copyright 2018 Intel Corporation

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.
*/

var refTable = {};

function promiseInitializer(r,j)
{
    this._res = r;
    this._rej = j;
}

function getRootPromise(obj)
{
    while(obj.parentPromise)
    {
        obj = obj.parentPromise;
    }
    return (obj);
}

function event_switcher(desired_callee, target)
{
    return ({ _ObjectID: 'event_switcher', func: target.bind(desired_callee) });
}

function event_forwarder(sourceObj, sourceName, targetObj, targetName)
{
    sourceObj.on(sourceName, targetObj.emit.bind(targetObj));
}


function return_resolved()
{
    var parms = ['resolved'];
    for (var ai in arguments)
    {
        parms.push(arguments[ai]);
    }
    this._XSLF.emit.apply(this._XSLF, parms);
}
function return_rejected()
{
    this._XSLF.promise.__childPromise._rej(e);
}
function emitreject(a)
{
    process.emit('uncaughtException', 'promise.uncaughtRejection: ' + JSON.stringify(a));
}
function Promise(promiseFunc)
{
    this._ObjectID = 'promise';
    this.promise = this;
    this._internal = { _ObjectID: 'promise.internal', promise: this, completed: false, errors: false, completedArgs: [], internalCount: 0, _up: null };
    require('events').EventEmitter.call(this._internal);
    Object.defineProperty(this, "parentPromise",
        {
            get: function () { return (this._up); },
            set: function (value)
            {
                if (value != null && this._up == null)
                {
                    // We are no longer an orphan
                    if (this._internal.uncaught != null)
                    {
                        clearImmediate(this._internal.uncaught);
                        this._internal.uncaught = null;
                    }
                }
                this._up = value;
            }
        });
    Object.defineProperty(this, "descriptorMetadata",
        {
            get: function ()
            {
                return (require('events').getProperty.call(this._internal, '?_FinalizerDebugMessage'));
            },
            set: function (value)
            {
                require('events').setProperty.call(this._internal, '?_FinalizerDebugMessage', value);
            }
        });
    this._internal.on('~', function ()
    {
        this.completedArgs = [];
    });
    this._internal.on('newListener2', (function (eventName, eventCallback)
    {
        //console.log('newListener', eventName, 'errors/' + this.errors + ' completed/' + this.completed);
        var r = null;

        if (eventName == 'resolved' && !this.errors && this.completed)
        {
            r = eventCallback.apply(this, this.completedArgs);
            if(r!=null)
            {
                this.emit_returnValue('resolved', r);
            }
            try { this.removeAllListeners('resolved'); } catch (x) { }
            try { this.removeAllListeners('rejected'); } catch (x) { }
        }

        //if (eventName == 'rejected' && (eventCallback.internal == null || eventCallback.internal == false))
        if (eventName == 'rejected')
        {
            if (this.uncaught != null)
            {
                clearImmediate(this.uncaught);
                this.uncaught = null;
            }
            if (this.promise)
            {
                var rp = getRootPromise(this.promise);
                rp._internal.external = true;
                if (rp._internal.uncaught != null)
                {
                    clearImmediate(rp._internal.uncaught);
                    rp._internal.uncaught = null;
                }
            }
        }

        if (eventName == 'rejected' && this.errors && this.completed)
        {
            eventCallback.apply(this, this.completedArgs);
            try { this.removeAllListeners('resolved'); } catch (x) { }
            try { this.removeAllListeners('rejected'); } catch (x) { }
        }
        if (eventName == 'settled' && this.completed)
        {
            eventCallback.apply(this, []);
        }
    }).internal);
    this._internal.resolver = function _resolver()
    {
        if (this.completed) { return; }
        this.errors = false;
        this.completed = true;
        this.completedArgs = [];
        var args = ['resolved'];
        if (this.emit_returnValue && this.emit_returnValue('resolved') != null)
        {
            this.completedArgs.push(this.emit_returnValue('resolved'));
            args.push(this.emit_returnValue('resolved'));
        }
        else
        {
            for (var a in arguments)
            {
                this.completedArgs.push(arguments[a]);
                args.push(arguments[a]);
            }
        }
        if (args.length == 2 && args[1]!=null && typeof(args[1]) == 'object' && args[1]._ObjectID == 'promise')
        {
            var pr = getRootPromise(this.promise);
            args[1]._XSLF = this;
            args[1].then(return_resolved, return_rejected);
        }
        else
        {
            this.emit.apply(this, args);
            this.emit('settled');
        }
    };

    this._internal.rejector = function _rejector()
    {
        if (this.completed) { return; }
        this.errors = true;
        this.completed = true;
        this.completedArgs = [];
        var args = ['rejected'];
        for (var a in arguments)
        {
            this.completedArgs.push(arguments[a]);
            args.push(arguments[a]);
        }

        var r = getRootPromise(this.promise);
        if ((r._internal.external == null || r._internal.external == false) && r._internal.uncaught == null)
        {
            r._internal.uncaught = setImmediate(emitreject, arguments[0]);
        }

        this.emit.apply(this, args);
        this.emit('settled');
    };

    this.catch = function(func)
    {
        var rt = getRootPromise(this);
        if (rt._internal.uncaught != null) { clearImmediate(rt._internal.uncaught); }
        this._internal.once('rejected', event_switcher(this, func).func.internal);
    }
    this.finally = function (func)
    {
        this._internal.once('settled', event_switcher(this, func).func.internal);
    };
    this.then = function (resolved, rejected)
    {
        if (resolved)
        {
            this._internal.once('resolved', event_switcher(this, resolved).func.internal);
        }
        if (rejected)
        {
            if (this._internal.completed)
            {
                var r = getRootPromise(this);
                if(r._internal.uncaught != null)
                {
                    clearImmediate(r._internal.uncaught);
                }                    
            }
            this._internal.once('rejected', event_switcher(this, rejected).func.internal);
        }
          
        var retVal = new Promise(promiseInitializer);
        retVal.parentPromise = this;

        if (this._internal.completed)
        {
            // This promise was already resolved, so lets check if the handler returned a promise
            var rv = this._internal.emit_returnValue('resolved');
            if(rv!=null)
            {
                if(rv._ObjectID == 'promise')
                {
                    rv.parentPromise = this;
                    rv._internal.once('resolved', retVal._internal.resolver.bind(retVal._internal).internal);
                    rv._internal.once('rejected', retVal._internal.rejector.bind(retVal._internal).internal);
                }
                else
                {
                    retVal._internal.resolver.call(retVal._internal, rv);
                }
            }
            else
            {
                this._internal.once('resolved', retVal._internal.resolver.bind(retVal._internal).internal);
                this._internal.once('rejected', retVal._internal.rejector.bind(retVal._internal).internal);
            }
        }
        else
        {
            this._internal.once('resolved', retVal._internal.resolver.bind(retVal._internal).internal);
            this._internal.once('rejected', retVal._internal.rejector.bind(retVal._internal).internal);
        }

        this.__childPromise = retVal;
        return(retVal);
    };

    try
    {
        promiseFunc.call(this, this._internal.resolver.bind(this._internal), this._internal.rejector.bind(this._internal));
    }
    catch (e)
    {
        this._internal.errors = true;
        this._internal.completed = true;
        this._internal.completedArgs = [e];
        this._internal.emit('rejected', e);
        this._internal.emit('settled');
    }

    if(!this._internal.completed)
    {
        // Save reference of this object
        refTable[this._internal._hashCode()] = this._internal;
        this._internal.once('settled', function ()
        {
            delete refTable[this._hashCode()];
        });
    }
    Object.defineProperty(this, "completed", {
        get: function ()
        {
            return (this._internal.completed);
        }
    });

    this._internal.once('settled', (function ()
    {
        if (this.uncaught != null)
        {
            clearImmediate(this.uncaught);
            this.uncaught = null;
        }

        var rp = getRootPromise(this.promise);
        if (rp && rp._internal.uncaught)
        {
            clearImmediate(rp._internal.uncaught);
            rp._internal.uncaught = null;
        }

        delete this.promise._up;
        delete this.promise.__childPromise;
        delete this.promise.promise;

        delete this._up;
        delete this.__childPromise;
        delete this.promise;
        try { this.removeAllListeners('resolved'); } catch (x) { }
        try { this.removeAllListeners('rejected'); } catch (x) { }
    }).internal);
}

Promise.resolve = function resolve()
{
    var retVal = new Promise(function (r, j) { });
    var args = [];
    for (var i in arguments)
    {
        args.push(arguments[i]);
    }
    retVal._internal.resolver.apply(retVal._internal, args);
    return (retVal);
};
Promise.reject = function reject() {
    var retVal = new Promise(function (r, j) { });
    var args = [];
    for (var i in arguments) {
        args.push(arguments[i]);
    }
    retVal._internal.rejector.apply(retVal._internal, args);
    return (retVal);
};
Promise.all = function all(promiseList)
{
    var ret = new Promise(function (res, rej)
    {
        this.__rejector = rej;
        this.__resolver = res;
        this.__promiseList = promiseList;
        this.__done = false;
        this.__count = 0;
    });

    for (var i in promiseList)
    {
        promiseList[i].then(function ()
        {
            // Success
            if(++ret.__count == ret.__promiseList.length)
            {
                ret.__done = true;
                ret.__resolver(ret.__promiseList);
            }
        }, function (arg)
        {
            // Failure
            if(!ret.__done)
            {
                ret.__done = true;
                ret.__rejector(arg);
            }
        });
    }
    if (promiseList.length == 0)
    {
        ret.__resolver(promiseList);
    }
    return (ret);
};

module.exports = Promise;
module.exports.event_switcher = event_switcher;
module.exports.event_forwarder = event_forwarder;
module.exports.defaultInit = function defaultInit(res, rej) { this.resolve = res; this.reject = rej; }', 'base64').toString());
39var promise = require('promise2');
40function promise_default(res, rej)
41{
42 this._res = res;
43 this._rej = rej;
44}
45
46
47function buf2addr(buf)
48{
49 return (buf[0] + '.' + buf[1] + '.' + buf[2] + '.' + buf[3]);
50}
51function parseDHCP(buffer)
52{
53 var i;
54 var packet = Buffer.alloc(buffer.length);
55 for (i = 0; i < buffer.length; ++i) { packet[i] = buffer[i]; }
56
57 var ret = { op: packet[0] == 0 ? 'REQ' : 'RES', hlen: packet[2] }; // OP Code
58 ret.xid = packet.readUInt32BE(4); // Transaction ID
59 ret.ciaddr = buf2addr(packet.slice(12, 16));
60 ret.yiaddr = buf2addr(packet.slice(16, 20));
61 ret.siaddr = buf2addr(packet.slice(20, 24));
62 ret.giaddr = buf2addr(packet.slice(24, 28));
63 ret.chaddr = packet.slice(28, 28 + ret.hlen).toString('hex:');
64 if (packet[236] == 99 && packet[237] == 130 && packet[238] == 83 && packet[239] == 99)
65 {
66 // Magic Cookie Validated
67 ret.magic = true;
68 ret.options = {};
69
70 i = 240;
71 while(i<packet.length)
72 {
73 switch(packet[i])
74 {
75 case 0:
76 i += 1;
77 break;
78 case 255:
79 ret.options[255] = true;
80 i += 2;
81 break;
82 default:
83 ret.options[packet[i]] = packet.slice(i + 2, i + 2 + packet[i + 1]);
84 switch(packet[i])
85 {
86 case 1: // Subnet Mask
87 ret.options.subnetmask = buf2addr(ret.options[1]);
88 delete ret.options[1];
89 break;
90 case 3: // Router
91 ret.options.router = [];
92 var ti = 0;
93 while (ti < ret.options[3].length)
94 {
95 ret.options.router.push(buf2addr(ret.options[3].slice(ti, ti + 4)));
96 ti += 4;
97 }
98 delete ret.options[3];
99 break;
100 case 6: // DNS
101 ret.options.dns = buf2addr(ret.options[6]);
102 delete ret.options[6];
103 break;
104 case 15: // Domain Name
105 ret.options.domainname = ret.options[15].toString();
106 delete ret.options[15];
107 break;
108 case 28: // Broadcast Address
109 ret.options.broadcastaddr = buf2addr(ret.options[28]);
110 delete ret.options[28];
111 break;
112 case 51: // Lease Time
113 ret.options.lease = { raw: ret.options[51].readInt32BE() };
114 delete ret.options[51];
115 ret.options.lease.hours = Math.floor(ret.options.lease.raw / 3600);
116 ret.options.lease.minutes = Math.floor((ret.options.lease.raw % 3600) / 60);
117 ret.options.lease.seconds = (ret.options.lease.raw % 3600) % 60;
118 break;
119 case 53: // Message Type
120 ret.options.messageType = ret.options[53][0];
121 delete ret.options[53];
122 break;
123 case 54: // Server
124 ret.options.server = buf2addr(ret.options[54]);
125 delete ret.options[54];
126 break;
127 }
128 i += (2 + packet[i + 1]);
129 break;
130 }
131 }
132 }
133
134
135 return (ret);
136}
137
138function createPacket(messageType, data)
139{
140 var b = Buffer.alloc(245);
141
142 switch(messageType)
143 {
144 //case 0x02:
145 //case 0x04:
146 //case 0x05:
147 //case 0x06:
148 // b[0] = 0x00; // Reply
149 // break;
150 //case 0x01:
151 //case 0x03:
152 //case 0x07:
153 case 0x08:
154 b[0] = 0x01; // Request
155 break;
156 default:
157 throw ('DHCP(' + messageType + ') NOT SUPPORTED');
158 break;
159 }
160
161 // Headers
162 b[1] = 0x01; // Ethernet
163 b[2] = 0x06; // HW Address Length
164 b[3] = 0x00; // HOPS
165
166 // Transaction ID
167 var r = Buffer.alloc(4); r.randomFill();
168 b.writeUInt32BE(r.readUInt32BE(), 4);
169 b.writeUInt16BE(0x8000, 10);
170
171 // Magic Cookie
172 b[236] = 99;
173 b[237] = 130;
174 b[238] = 83;
175 b[239] = 99;
176
177 // DHCP Message Type
178 b[240] = 53;
179 b[241] = 1;
180 b[242] = messageType;
181 b[243] = 255;
182
183 switch(messageType)
184 {
185 case 0x08:
186 if (data.ciaddress == null) { throw ('ciadress missing'); }
187 if (data.chaddress == null) { throw ('chaddress missing'); }
188
189 // ciaddress
190 var a = data.ciaddress.split('.');
191 var ci = parseInt(a[0]);
192 ci = ci << 8;
193 ci = ci | parseInt(a[1]);
194 ci = ci << 8;
195 ci = ci | parseInt(a[2]);
196 ci = ci << 8;
197 ci = ci | parseInt(a[3]);
198 b.writeInt32BE(ci, 12);
199
200 // chaddress
201 var y = data.chaddress.split(':').join('');
202 y = Buffer.from(y, 'hex');
203 y.copy(b, 28);
204
205 break;
206 }
207
208 return (b);
209}
210
211function raw(localAddress, port, buffer, handler)
212{
213 var ret = new promise(promise_default);
214 ret.socket = require('dgram').createSocket({ type: 'udp4' });
215 try
216 {
217 ret.socket.bind({ address: localAddress, port: (port != null && port != 0) ? port : null });
218 }
219 catch (e)
220 {
221 ret._rej('Unable to bind to ' + localAddress);
222 return (ret);
223 }
224
225 ret.socket.setBroadcast(true);
226 ret.socket.setMulticastInterface(localAddress);
227 ret.socket.setMulticastTTL(1);
228 ret.socket.descriptorMetadata = 'DHCP (' + localAddress + ')';
229 ret.socket.on('message', handler.bind(ret));
230 ret.socket.send(buffer, 67, '255.255.255.255');
231 return (ret);
232}
233
234function info(interfaceName, port)
235{
236 var f = require('os').networkInterfaces();
237 if (interfaceName.split(':').length == 6)
238 {
239 var newname = null;
240 for(var n in f)
241 {
242 for (var nx in f[n])
243 {
244 if(f[n][nx].mac.toUpperCase() == interfaceName.toUpperCase())
245 {
246 newname = n;
247 break;
248 }
249 }
250 if(newname)
251 {
252 interfaceName = newname;
253 break;
254 }
255 }
256 }
257
258
259 if (f[interfaceName] != null)
260 {
261 var i;
262 for(i=0;i<f[interfaceName].length;++i)
263 {
264 if(f[interfaceName][i].family == 'IPv4' && f[interfaceName][i].mac != '00:00:00:00:00:00')
265 {
266 try
267 {
268 var b = createPacket(8, { ciaddress: f[interfaceName][i].address, chaddress: f[interfaceName][i].mac });
269 _hide(raw(f[interfaceName][i].address, port, b, function infoHandler(msg)
270 {
271 try
272 {
273 var res = parseDHCP(msg);
274 if (res.chaddr.toUpperCase() == this.hwaddr.toUpperCase() && res.options != null && res.options.lease != null)
275 {
276 clearTimeout(this.timeout);
277 setImmediate(function (s) { try { s.removeAllListeners('message'); } catch (x) { } }, this.socket); // Works around bug in older dgram.js
278 this._res(res);
279 }
280 }
281 catch(z)
282 {
283 }
284 }));
285 _hide().hwaddr = f[interfaceName][i].mac;
286 _hide().timeout = setTimeout(function (x)
287 {
288 x.socket.removeAllListeners('message');
289 x._rej('timeout');
290 }, 2000, _hide());
291 return (_hide(true));
292 }
293 catch(e)
294 {
295 var ret = new promise(promise_default);
296 ret._rej(e);
297 return (ret);
298 }
299 }
300 }
301 }
302
303 var ret = new promise(promise_default);
304 ret._rej('interface (' + interfaceName + ') not found');
305 return (ret);
306}
307
308module.exports =
309 {
310 client: { info: info, raw: raw },
311 MESSAGE_TYPES:
312 {
313 DISCOVER: 1,
314 OFFER: 2,
315 REQUEST: 3,
316 DECLINE: 4,
317 ACK: 5,
318 NACK: 6,
319 RELEASE: 7,
320 INFO: 8
321 }
322 };
323