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appnet.link-server.js
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appnet.link-server.js
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// AppNet.Link name-server implementation, that works with appnet.link name-client.
// Copyright (c) 2012-present Tom Zhou<[email protected]>
//
'use strict';
var debug = require('debug')('appnet.link.srv');
// AppNet.link module
var AppNet = require('appnet.link');
// Session establish protocol
var SEP = AppNet.SEP;
// eventEmitter
var eventEmitter = require('events'),
util = require('util'),
url = require('url'),
http = require('http'),
https = require('https'),
httpp = require('httpp'),
httpps = require('httpps'),
crypto = require('crypto'),
Connect = require('connect'),
connect_httpp = require('connect-httpp'),
UDT = require('udt');
// security hash
// SIPKEY can be any user defined 4 integers
var SIPHASH = require('siphash'),
SIPKEY = [0x33336666, 0x33338888, 0x88889999, 0x11116666]; // magic key
// MSGPACK library
// prefer JSON format instead of msgpack
var MSGPACK = require('msgpack-js');
// p2p stream websocket library
var WebSocket = require('wspp').wspp;
var WebSocketServer = WebSocket.Server;
// http/httpp-proxy library
var httpProxy = require('httpp-proxy');
var httppProxy = httpProxy.httppproxy;
// UUID generator
var UUID = require('uuid');
// SDP model
var Sdp = require('./sdp');
// STUN model
var Stun = require('./stun');
// TURN model
var Turn = require('./turn');
// vURL model
var vurl = require('./vurl');
var vURL = new vurl(); // memory store by now TBD... memory DB
// Peer service model
var peerservice = require('./peerservice');
var peerService = new peerservice(); // memory store by now TBD... memory DB
// SSL binary wrap
var SSL = require('./ssl');
// GeoIP model
var geoIP = require('geoip-lite');
// name-server pair - primary/alternate listen on UDP port 51686/51868 in default
// turn-server pair - proxy/agent server
// - endpoints : {dn: domain name, ipaddr: name-server hostname or IP, ports: [primary,alternative], turn: [proxy,agent], option: {mbw:xxx, ...}}
// - endpoints.dn : server's domain name, it's needed for TURN session
// - endpoints.turn : turn proxy/agent ports
// - endpoints.option: default user-specific features,like mbw - maxim bandwidth, etc
// -
// - sslcerts: {
// ca: {key: xxx, cert: xxx, cont: xxx},
// ns: {key: xxx, cert: yyy},
// as: {key: xxx, cert: yyy},
// ps: {key: xxx, cert: yyy, subdn:{'subdomain': {key:x, cert: x}}}} https/httpps SSL certs
// }
var nmSrv = exports = module.exports = function(endpoints, sslcerts){
if (!(this instanceof nmSrv)) return new nmSrv(endpoints, sslcerts);
var self = this;
// super constructor
eventEmitter.call(self);
// at least two ports to listen
self.dn = endpoints.dn || '51dese.com';
self.ipaddr = endpoints.ipaddr || '0.0.0.0';
self.ports = endpoints.ports || [51686, 51868];
// SSL certs
self.sslcerts = sslcerts || {};
self.sslcerts.ns = self.sslcerts.ns || false;
self.sslcerts.as = self.sslcerts.as || false;
self.sslcerts.ps = self.sslcerts.ps || false;
// ssl CA cert/key
self.sslcerts.ca = self.sslcerts.ca || false;
// default user-specific features
self.option = endpoints.option || {};
// server obj cache
self.srvs = {};
// clients connection cache
self.conn = {}; // ['clnt2srv'] = client connection
// turn server obj cache
self.turnPorts = endpoints.turn;
self.turnSrvs = {}; // proxy/agent server
self.turnConn = {}; // ['clnt2agentsrv'/''clnt2proxysrv''] = client connection
self.turnProxyCache = {}; // proxy cache to record vurl to httpp-proxy map. TBD... with DB
self.trunProxyHistory = {}; // proxy history to record user connection info to vurl map. TBD... with DB
// - key: user connection host:vurl or host:port:vurl in case security mode 2
// - val: {
// timestamp: // timestamp of connection
// state: , // 0: fail, 1: pass, -1: reject with timeout,
// trys: , // re-try times before pass
// maxTrys: , // maxim re-trys. default 6 times
// timeOut: // reject timeout. default 6s
// }
// wrap socket.send method
function sendOpcMsg(socket, opc_msg, fn){
try {
if (socket && socket.send) {
// !!!Prefer json instead of msgpack
///socket.send(MSGPACK.encode(opc_msg), function(err){
socket.send(JSON.stringify(opc_msg), function(err){
if (err) {
console.log(err+',sendOpcMsg failed');
if (fn) fn(err+',sendOpcMsg failed');
} else {
if (fn) fn(null);
}
});
} else {
console.log('invalid socket,sendOpcMsg failed immediately');
if (fn) fn('invalid socket,sendOpcMsg failed immediately');
}
} catch (e) {
console.log(e+',sendOpcMsg failed immediately');
if (fn) fn(e+',sendOpcMsg failed immediately');
}
}
// on connection process
function onConnection(client) {
var sk, ck; // key for server/client on public ip/port
var peerclnt; // the connection obj which the peer come from
var mineclnt; // the connection obj which the client come from
debug('new connection');
// initialize offer message count per client
// every time, server send one offer message, increase it by one
client.offerMsgcnt = 0;
// onMessage handler
client.on('message', function(message){
// !!! catch any exceptions and ignore it
try
{
var data = typeof message !== 'string' ? MSGPACK.decode(message) : JSON.parse(message);
debug('nmsrv:new message:'+JSON.stringify(data));
// check if opc is valid
if ('number' === typeof data.opc) {
switch (data.opc) {
// offer/answer opc -> /////////////////////////////////////////////
case SEP.SEP_OPC_SDP_OFFER:
// 1.
// check offer credit by user info
// 1.1
// notes: only support 51dese.com as domain at present !!!
if (data.offer.domain != '51dese.com' && data.offer.domain != 'www.51dese.com' &&
data.offer.domain != 'appnet.link' && data.offer.domain != 'www.appnet.link') {
console.log('invalid domain, please use 51dese.com or appnet.link by now');
data.opc = SEP.SEP_OPC_SDP_ANSWER;
data.answer = {};
data.answer.ready = false;
data.answer.error = 'invalid domain, please use 51dese.com or appnet.link by now';
// 1.1.1
// send back answer message, then close client and agent client in case have
sendOpcMsg(client, data, function(err){
if (err) console.log(err+'sendOpcMsg failed');
setTimeout(function(){
if (client && client.close) client.close();
}, 2000); // 2s timeout
});
// 1.1.1.1
// emit event
self.emit('NS.SEP.SEP_OPC_SDP_OFFER', {client: client, data: data});
break;
}
// 1.2
// check if usrkey is existing
// TBD...
//Sdp.testUser({domain: data.offer.domain, usrkey: data.offer.usrkey}, function(err, yes){
//});
// 2.
// record SDP session
var sesn = {};
//sesn = data.offer;
for (var k in data.offer) {
sesn[k] = data.offer[k];
}
// 2.1
// fill session info saw by server
sesn.clntpublicIP = client._socket.remoteAddress;
sesn.clntpublicPort = client._socket.remotePort;
sesn.srvlocalIP = client._socket.address().address;
sesn.srvlocalPort = client._socket.address().port;
sesn.srvpublicDN = self.dn;
sesn.sid = UUID.v4();
// 2.2
// query client's geoIP
sesn.clntgeoip = JSON.stringify(geoIP.lookup(client._socket.remoteAddress) || {country: 'NA',city: 'XY'});
debug('new name-client GeoIP:'+sesn.clntgeoip);
// 2.3
// persistent session info
var sdp = new Sdp(sesn);
debug('new SDP session:'+JSON.stringify(sdp));
sdp.saveOupdate(function(err, sdp){
// 3.
// send back SDP answer
data.opc = SEP.SEP_OPC_SDP_ANSWER;
data.answer = {};
if (err || !sdp) {
console.log('new SDP session failed:'+err);
// send back fake SDP session as answer
data.answer = {};
data.answer.state = SEP.SEP_OPC_STATE_FAIL;
// close socket after 2s
sendOpcMsg(client, data, function(err){
if (err) console.log(err+'sendOpcMsg failed');
setTimeout(function(){
if (client && client.close) client.close();
}, 2000); // 2s timeout
});
// 3.1
// emit event
self.emit('NS.SEP.SEP_OPC_SDP_OFFER', {client: client, data: data});
} else {
// hook client info
client.clntinfo = {
// user info
domain: data.offer.domain,
usrkey: data.offer.usrkey,
// client info
gid: sdp.client.gid, // client gid
vpath: sdp.client.vpath, // client vpath
vhost: sdp.client.vhost, // client vhost
vmode: sdp.client.vmode, // client vURL mode
secmode: sdp.client.secmode, // client secure mode
vtoken: sdp.client.vtoken, // client vURL secure token
clntgeoip: JSON.parse(sdp.client.geoip), // client GeoIP
clntlip: sdp.client.localIP, // client local ip/port
clntlport: sdp.client.localPort,
clntip: sdp.sdp.clntIP, // client public ip/port
clntport: sdp.sdp.clntPort,
srvip: sdp.server.ip, // server public ip/port
srvport: sdp.server.port,
srvdn: sdp.server.dn
};
// cache client obj per server/client with public ip/port
// TBD... cache in redisStore, etc, instead of memStore
ck = sdp.sdp.clntIP+':'+sdp.sdp.clntPort; // key for client ip/port
sk = sdp.server.ip+':'+sdp.server.port; // key for server ip/port
self.conn[sk] = self.conn[sk] || {};
(self.conn[sk])[ck] = client;
// send back real SDP session as answer
data.answer = sdp;
data.answer.state = SEP.SEP_OPC_STATE_READY;
// !!! for security, only return country/city of GeoIP to client
if (data.answer.client.geoip) {
data.answer.client.geoip = JSON.parse(data.answer.client.geoip);
Object.keys(data.answer.client.geoip).forEach(function(k){
if (!(k in {country: 'us', city: 'ca'})) {
data.answer.client.geoip[k] = null;
delete data.answer.client.geoip[k];
}
});
}
// send TURN server agent port info,ip is same as name-server normally
// TBD balance...
if (self.turnPorts) {
data.answer.turn = {agentport: self.turnPorts[1], agentip: sdp.server.ip};
} else {
data.answer.turn = false;
}
// 3.2
// generate security certification in secure mode
// TBD... added subject's alternate name like public/local ip, etc
if (data.offer.secmode) {
// require server to generate ssl certification
SSL.genSslCertCA(sdp.client.gid,
// client cert info
{
cn: sdp.client.vmode == vurl.URL_MODE_HOST ? '*.vurl.' + sdp.server.dn : sdp.server.dn,
ca_cert: self.sslcerts.ca && self.sslcerts.ca.cert,
ca_key: self.sslcerts.ca && self.sslcerts.ca.key,
// SSL V3 alternate names: sub-domains, public/local ip, 127.0.0.1 and Agent server IP
altname: [
///'*.*.vurl.'+sdp.server.dn, '*.vurl.local.'+sdp.server.dn, '*.*.vurl.local.'+sdp.server.dn,
///'*.vurl.'+sdp.server.dn,
client.clntinfo.clntip, client.clntinfo.clntlip,
'127.0.0.1', 'localhost',
'::1', 'ip6-localhost',
sdp.server.ip,
// append vlocal. subdomain
sdp.client.vmode == vurl.URL_MODE_HOST ? '*.vurl.vlocal.' + sdp.server.dn : 'vlocal.' + sdp.server.dn,
],
},
function(err, cert) {
if (err) {
console.log(err+',generate security certs failed');
data.answer.secerts = null;
sendOpcMsg(client, data);
// 3.2.1
// emit event
self.emit('NS.SEP.SEP_OPC_SDP_OFFER', {client: client, data: data});
} else {
// 3.2.2
// like for *.vurl.51dese.com
data.answer.secerts = cert;
// 3.2.3
// put self-signed CA cert
data.answer.secerts.ca = self.sslcerts.ca && self.sslcerts.ca.cont;
// enable bi-direction authentication
data.answer.secerts.requestCert = true;
data.answer.secerts.rejectUnauthorized = true;
// 3.2.5
// send sdp back
sendOpcMsg(client, data);
// 3.2.6
// emit event
self.emit('NS.SEP.SEP_OPC_SDP_OFFER', {client: client, data: data});
}
});
} else {
sendOpcMsg(client, data);
// 3.2.6
// emit event
self.emit('NS.SEP.SEP_OPC_SDP_OFFER', {client: client, data: data});
}
}
});
break;
case SEP.SEP_OPC_NAT_OFFER:
// 1.
// check if user was allowed to query it
// TBD...
// 2.
// update client NAT type info
Sdp.updateClntInfo({gid: data.offer.gid, natype: data.offer.natype}, function(err){
// 3.
// fill answer opc
data.opc = SEP.SEP_OPC_NAT_ANSWER;
data.answer = {};
data.answer.state = SEP.SEP_OPC_STATE_READY;
if (err) {
console.log(err+',update client natype failed');
data.answer.ready = false;
} else {
console.log('update client natype successfully');
data.answer.ready = true;
}
// 4.
// send message back
sendOpcMsg(client, data);
// 4.1
// emit event
self.emit('NS.SEP.SEP_OPC_NAT_OFFER', {client: client, data: data});
});
break;
case SEP.SEP_OPC_HEART_BEAT_OFFER:
// 1.
// check if user was allowed to query it
// TBD...
// 2.
// heart-beat check response
// 2.1
// fill answer opc
data.opc = SEP.SEP_OPC_HEART_BEAT_ANSWER;
data.answer = {};
data.answer.state = SEP.SEP_OPC_STATE_READY;
data.answer.ready = true;
// fill server timestamp
data.answer.timeAt = Date.now();
// 3.
// send message back
sendOpcMsg(client, data);
// 3.1
// emit event
self.emit('NS.SEP.SEP_OPC_HEART_BEAT_OFFER', {client: client, data: data});
break;
case SEP.SEP_OPC_STUN_OFFER:
debug('stun.offer:'+JSON.stringify(data));
// 1.
// check offer credit
// TBD... policy
// - allow to public peer
// - allow to test user
// - allow to user-self peer
// - allow to peer authenticated ACL list
/*
console.log('self.conn.skeys:');
for (k in self.conn) {
console.log(', '+k+',ckeys:');
for (var k1 in self.conn[k]) {
console.log(', '+k1);
}
}
console.log('offer.mine:'+data.offer.mine.ip+':'+data.offer.mine.port+'@'+
client.clntinfo.srvip+':'+client.clntinfo.srvport);
console.log('offer.peer:'+data.offer.peer.ip+':'+data.offer.peer.port+'@'+
client.clntinfo.srvip+':'+client.clntinfo.srvport);
*/
// TBD... clients cache load balance
/*var ck = data.offer.mine.ip+data.offer.mine.port;
for (var sk in self.conn) {
if (ck in self.conn[sk]) {
peerclnt = (self.conn[sk])[ck];
break;
}
}*/
/*mineclnt = (self.conn[client.clntinfo.srvip+':'+client.clntinfo.srvport])
[data.offer.mine.ip+':'+data.offer.mine.port];*/
mineclnt = client; // current client is always mine
peerclnt = (self.conn[client.clntinfo.srvip+':'+client.clntinfo.srvport])
[data.offer.peer.ip+':'+data.offer.peer.port];
// 1.1
// check on user for authentication
// only allow user connect to user-self, public user and test user
// TBD... Policy-Based_ACL
if (mineclnt.clntinfo && mineclnt.clntinfo.domain && mineclnt.clntinfo.usrkey &&
peerclnt.clntinfo && peerclnt.clntinfo.domain && peerclnt.clntinfo.usrkey &&
// 1.1.1
// !!! allow connect to user-self
((mineclnt.clntinfo.domain === peerclnt.clntinfo.domain && mineclnt.clntinfo.usrkey === peerclnt.clntinfo.usrkey) ||
// 1.1.2
// !!! allow connect to public user
(mineclnt.clntinfo.domain === peerclnt.clntinfo.domain && 'public' === peerclnt.clntinfo.usrkey) ||
// 1.1.3
// !!! allow connect to test user
(mineclnt.clntinfo.domain === peerclnt.clntinfo.domain &&
mineclnt.clntinfo.usrkey.match(/(A|B|C)/gi) &&
peerclnt.clntinfo.usrkey.match(/(A|B|C)/gi)))) {
///
} else {
console.error('!!!DDOS attack,no permission to get STUN session');
// 1.1.3
// send STUN_ANSWER to myself client
data.offer.isInitiator = true;
data.opc = SEP.SEP_OPC_STUN_ANSWER;
data.answer = {};
data.answer.state = SEP.SEP_OPC_STATE_FAIL;
data.answer.ready = false;
// 1.1.5
// close after 2s
sendOpcMsg(mineclnt, data, function(err){
if (err) console.error(err+'sendOpcMsg failed');
setTimeout(function(){
if (mineclnt && mineclnt.close) mineclnt.close();
}, 2000); // 2s timeout
});
debug('mineclnt stun.data.offer:'+JSON.stringify(data.offer));
// 1.1.6
// emit event with initiator
self.emit('NS.SEP.SEP_OPC_STUN_OFFER', {client: mineclnt, data: data});
break;
}
// 2.
// fill punch hole offer
data.opc = SEP.SEP_OPC_PUNCH_OFFER;
// 3.
// send punch hole offer to both peers
// 3.1
// keep data.seqno as stun initiator
// send punch hole offer to myself client
data.offer.isInitiator = true;
sendOpcMsg(mineclnt, data);
debug('mineclnt stun.data.offer:'+JSON.stringify(data.offer));
// emit event with initiator
self.emit('NS.SEP.SEP_OPC_STUN_OFFER', {client: mineclnt, data: data});
// swap offer.mine and offer.peer to assemble PUNCH offer for peer client
var tmp = data.offer.mine;
data.offer.mine = data.offer.peer;
data.offer.peer = tmp;
// send punch hole offer to peer client
data.offer.isInitiator = false;
sendOpcMsg(peerclnt, data);
debug('peerclnt stun.data.offer:'+JSON.stringify(data.offer));
break;
case SEP.SEP_OPC_TURN_OFFER:
debug('turn.offer:'+JSON.stringify(data));
// 1.
// check offer credit
// TBD... policy
// - allow to public peer
// - allow to test user
// - allow to user-self peer
// - allow to peer authenticated ACL list
/*
console.log('self.conn.skeys:');
for (k in self.conn) {
console.log(', '+k+',ckeys:');
for (var k1 in self.conn[k]) {
console.log(', '+k1);
}
}
console.log('offer.mine:'+data.offer.mine.ip+':'+data.offer.mine.port+'@'+
client.clntinfo.srvip+':'+client.clntinfo.srvport);
console.log('offer.peer:'+data.offer.peer.ip+':'+data.offer.peer.port+'@'+
client.clntinfo.srvip+':'+client.clntinfo.srvport);
*/
// TBD... clients cache load balance
/*var ck = data.offer.mine.ip+data.offer.mine.port;
for (var sk in self.conn) {
if (ck in self.conn[sk]) {
peerclnt = (self.conn[sk])[ck];
break;
}
}*/
/*mineclnt = (self.conn[client.clntinfo.srvip+':'+client.clntinfo.srvport])
[data.offer.mine.ip+':'+data.offer.mine.port];*/
mineclnt = client; // current client is always mine
peerclnt = (self.conn[client.clntinfo.srvip+':'+client.clntinfo.srvport])
[data.offer.peer.ip+':'+data.offer.peer.port];
// 1.1
// check on user for authentication
// only allow user connect to user-self, public user and test user
// TBD... Policy-Based_ACL
if (mineclnt.clntinfo && mineclnt.clntinfo.domain && mineclnt.clntinfo.usrkey &&
peerclnt.clntinfo && peerclnt.clntinfo.domain && peerclnt.clntinfo.usrkey &&
// 1.1.1
// !!! allow connect to user-self
((mineclnt.clntinfo.domain === peerclnt.clntinfo.domain && mineclnt.clntinfo.usrkey === peerclnt.clntinfo.usrkey) ||
// 1.1.2
// !!! allow connect to public user
(mineclnt.clntinfo.domain === peerclnt.clntinfo.domain && 'public' === peerclnt.clntinfo.usrkey) ||
// 1.1.3
// !!! allow connect to test user
(mineclnt.clntinfo.domain === peerclnt.clntinfo.domain &&
mineclnt.clntinfo.usrkey.match(/(A|B|C)/gi) &&
peerclnt.clntinfo.usrkey.match(/(A|B|C)/gi)))) {
///
} else {
console.log('!!!DDOS attack,no permission to get TURN session');
// 1.1.3
// send TURN_ANSWER to myself client
data.offer.isInitiator = true;
data.opc = SEP.SEP_OPC_TURN_ANSWER;
data.answer = {};
data.answer.state = SEP.SEP_OPC_STATE_FAIL;
data.answer.ready = false;
// 1.1.5
// close after 2s
sendOpcMsg(mineclnt, data, function(err){
if (err) console.log(err+'sendOpcMsg failed');
setTimeout(function(){
if (mineclnt && mineclnt.close) mineclnt.close();
}, 2000); // 2s timeout
});
debug('mineclnt turn.data.offer:'+JSON.stringify(data.offer));
// 1.1.6
// emit event with initiator
self.emit('NS.SEP.SEP_OPC_TURN_OFFER', {client: mineclnt, data: data});
break;
}
// 2.
// check if Peer is ready for TURN/AGENT relay
// - find TURN/PROXY routing entry by peer's vURL root path
// - if TURN/AGENT ready, but no routing entry, just create one
// notes: by now we treat name-client's vURL root path as /vurl/:gid/
// TBD... vURL balance by name-client' GID
data.opc = SEP.SEP_OPC_TURN_ANSWER;
data.answer = {};
// every name-client has vURL based on vhost or vpath
var vurle = (data.offer.peer.vmode === vurl.URL_MODE_PATH) ? data.offer.peer.vpath : data.offer.peer.vhost;
vURL.get(vurle, function(err, routing){
if (err || !routing || !routing.turn) {
console.log('unknown TURN/PROXY routing entry');
data.answer.state = SEP.SEP_OPC_STATE_FAIL;
data.answer.ready = false;
// 2.1
// send turn answer to myself client
/*mineclnt = (self.conn[client.clntinfo.srvip+':'+client.clntinfo.srvport])
[data.offer.mine.ip+':'+data.offer.mine.port];*/
mineclnt = client; // current client is always mine
data.answer.isInitiator = true;
sendOpcMsg(mineclnt, data);
// 2.1.1
// emit event with initiator
self.emit('NS.SEP.SEP_OPC_TURN_OFFER', {client: mineclnt, data: data});
} else {
// 3.
// persistent TURN session
var turn = new Turn({
// session info
sid : UUID.v4(),
proto : 'udp',
mode : data.offer.mode,
// client info
minenatype: data.offer.mine.natype,
mineid : data.offer.mine.gid,
mineIP : data.offer.mine.ip,
minePort : data.offer.mine.port,
peernatype: data.offer.peer.natype,
peerid : data.offer.peer.gid,
peerIP : data.offer.peer.ip,
peerPort : data.offer.peer.port,
// turn server info got by vURL lookup
srvpublicDN : routing.turn.dn,
srvpublicIP : routing.turn.ipaddr,
srvproxyPort: routing.turn.proxyport,
srvagentPort: routing.turn.agentport
});
turn.saveOupdate(function(err, turn){
if (err) {
console.log(err+',record turn session failed');
data.answer.state = SEP.SEP_OPC_STATE_FAIL;
data.answer.ready = false;
} else {
// fill answer info
debug('saved turn session successfully:'+JSON.stringify(turn));
data.answer.state = SEP.SEP_OPC_STATE_READY;
data.answer.ready = true;
data.answer.peer = turn.peer;
data.answer.mine = turn.mine;
data.answer.turn = turn.session;
// fill TURN/PROXY vURL vpath or vhost info
data.answer.turn.vpath = data.offer.peer.vpath;
data.answer.turn.vhost = data.offer.peer.vhost;
data.answer.turn.vmode = data.offer.peer.vmode;
data.answer.turn.vtoken = data.offer.peer.vtoken;
// fill TURN security mode as peer security mode
data.answer.turn.secmode = data.offer.peer.secmode;
}
// 4.
// send turn answer to both peers
// - initiator will setup connection to turn/proxy server, then by turn/agent-client to peer
// - responsor will allow connection from turn/agent-client by turn/proxy server from initiator
// keep data.seqno as turn initiator
// 4.1
// send turn answer to myself client
data.answer.isInitiator = true;
sendOpcMsg(mineclnt, data);
debug('mineclnt turn.data.offer:'+JSON.stringify(data.offer));
// 4.1.1
// emit event with initiator
self.emit('NS.SEP.SEP_OPC_TURN_OFFER', {client: mineclnt, data: data});
// 4.2
// swap offer.mine and offer.peer to assemble TURN answer for peer client
// notes: only send it when find TURN/PROXY routing entry
if (data.answer.state === SEP.SEP_OPC_STATE_READY) {
var tmp = data.offer.mine;
data.offer.mine = data.offer.peer;
data.offer.peer = tmp;
// send turn answer to peer client
data.answer.isInitiator = false;
sendOpcMsg(peerclnt, data);
debug('peerclnt turn.data.offer:'+JSON.stringify(data.offer));
}
});
}
});
break;
case SEP.SEP_OPC_PUNCH_ANSWER:
// 1.
// check answer credit
// 2.
// send STUN answer to initiator
// Algorithem:
// - for both of asymmmetric NAT/FW, send message from Initiator side to name-server
// - for one asymmetric NAT/FW, another's symmetric, send message from symmetric side
// - for both of symmmetric NAT/FW, send message from Initiator side to name-server
// 2.1
// fill STUN answer
data.opc = SEP.SEP_OPC_STUN_ANSWER;
if (data.answer.state === SEP.SEP_OPC_STATE_READY) {
data.answer.ready = true;
// persist STUN session
var stun = new Stun({
sid : UUID.v4(),
proto : 'udp',
mode : data.offer.mode,
minenatype: data.offer.isInitiator ? data.offer.mine.natype : data.offer.peer.natype,
mineid : data.offer.isInitiator ? data.offer.mine.gid : data.offer.peer.gid,
peernatype: !data.offer.isInitiator ? data.offer.mine.natype : data.offer.peer.natype,
peerid : !data.offer.isInitiator ? data.offer.mine.gid : data.offer.peer.gid,
// MUST extract external ip/port from answer instead of offer.mine/peer
mineIP : data.offer.isInitiator ? ((data.answer.cinfo && data.answer.cinfo.moaddr) || data.offer.mine.ip) :
((data.answer.cinfo && data.answer.cinfo.poaddr) || data.offer.peer.ip),
minePort : data.offer.isInitiator ? ((data.answer.cinfo && data.answer.cinfo.moport) || data.offer.mine.port) :
((data.answer.cinfo && data.answer.cinfo.poport) || data.offer.peer.port),
peerIP : !data.offer.isInitiator ? ((data.answer.cinfo && data.answer.cinfo.moaddr) || data.offer.mine.ip) :
((data.answer.cinfo && data.answer.cinfo.poaddr) || data.offer.peer.ip),
peerPort : !data.offer.isInitiator ? ((data.answer.cinfo && data.answer.cinfo.moport) || data.offer.mine.port) :
((data.answer.cinfo && data.answer.cinfo.poport) || data.offer.peer.port)
});
stun.saveOupdate(function(err, stun){
if (err) {
console.log(err+',record stun session failed');
data.answer.state = SEP.SEP_OPC_STATE_FAIL;
data.answer.ready = false;
} else {
// fill answer info
debug('saved stun session successfully:'+JSON.stringify(stun));
data.answer.state = SEP.SEP_OPC_STATE_READY;
data.answer.ready = true;
data.answer.peer = stun.peer;
data.answer.mine = stun.mine;
data.answer.stun = stun.session;
}
// 2.2
// find connection of initiator
// TBD... mine/peer client load balance
/*var ck = data.offer.mine.ip+data.offer.mine.port;
for (var sk in self.conn) {
if (ck in self.conn[sk]) {
mineclnt = (self.conn[sk])[ck];
break;
}
}*/
if (data.offer.isInitiator) {
// current client is initiator
mineclnt = client;
} else {
// peer client is initiator
mineclnt = (self.conn[client.clntinfo.srvip+':'+client.clntinfo.srvport])
[data.offer.peer.ip+':'+data.offer.peer.port];
}
// 2.3.
// send STUN answer back
// keep data.seqno as stun initiator
sendOpcMsg(mineclnt, data);
// 2.3.1
// emit event with initiator
self.emit('NS.SEP.SEP_OPC_PUNCH_ANSWER', {client: mineclnt, data: data});
});
} else {
data.answer.state = SEP.SEP_OPC_STATE_FAIL;
data.answer.ready =false;
// 2.2
// find connection of initiator
// TBD... mine client load balance
/*var ck = data.offer.mine.ip+data.offer.mine.port;
for (var sk in self.conn) {
if (ck in self.conn[sk]) {
mineclnt = (self.conn[sk])[ck];
break;
}
}*/
if (data.offer.isInitiator) {
// current client is initiator
mineclnt = client;
} else {
// peer client is initiator
mineclnt = (self.conn[client.clntinfo.srvip+':'+client.clntinfo.srvport])
[data.offer.peer.ip+':'+data.offer.peer.port];
}
// 2.3.
// send STUN answer back
// keep data.seqno as stun initiator
sendOpcMsg(mineclnt, data);
// 2.3.1
// emit event with initiator
self.emit('NS.SEP.SEP_OPC_PUNCH_ANSWER', {client: mineclnt, data: data});
}
break;
// offer/answer opc <- /////////////////////////////////////////////
// user management opc -> //////////////////////////////////////////
case SEP.SEP_OPC_CLNT_SDP_OFFER:
// 1.
// check if user was allowed to query it
// TBD...
// 2.
// query sdp info
Sdp.getSdpByClnt(('string' === typeof data.offer.clnt) ?
data.offer.clnt : Sdp.genClntid(data.offer.clnt),
function(err, sdps){
// 3.
// send back CLNT_SDP answer
data.opc = SEP.SEP_OPC_CLNT_SDP_ANSWER;
data.answer = {};
if (err) {
console.log(err+',query sdp session failed');
// send back sdp session as answer
data.answer.sdps = [];
data.answer.state = SEP.SEP_OPC_STATE_FAIL;
} else {
// send back real sdp session as answer
data.answer.sdps = sdps;
data.answer.state = SEP.SEP_OPC_STATE_READY;
}
sendOpcMsg(client, data);
// 3.1
// emit event
self.emit('NS.SEP.SEP_OPC_CLNT_SDP_OFFER', { client: client, data: data});
});
break;
case SEP.SEP_OPC_ALL_USR_OFFER:
// 1.
// check if user was allowed to query it
// TBD... disable it by now
var _tbd_disable_alluser = true;
// 1.1
// allow test users so far
if (client.clntinfo.usrkey.match(/(A|B|C)/gi)) {
_tbd_disable_alluser = false;
}
if (_tbd_disable_alluser) {
data.opc = SEP.SEP_OPC_ALL_USR_ANSWER;
data.answer = {};
console.error('!!! Forbiden query all user info');
// send back user info session as answer
data.answer.usrs = [];
data.answer.state = SEP.SEP_OPC_STATE_FAIL;
sendOpcMsg(client, data);
// 1.1
// emit event
self.emit('NS.SEP.SEP_OPC_ALL_USR_OFFER', {client: mineclnt, data: data});
} else {
// 2.
// query login info
Sdp.getAllUsrs(function(err, usrs) {
// 3.
// send back ALL_USR answer
data.opc = SEP.SEP_OPC_ALL_USR_ANSWER;
data.answer = {};
if (err) {
console.log(err+',query user info failed');
// send back user info session as answer
data.answer.usrs = [];
data.answer.state = SEP.SEP_OPC_STATE_FAIL;
} else {
// send back real user info as answer
data.answer.usrs = usrs;
data.answer.state = SEP.SEP_OPC_STATE_READY;
}
sendOpcMsg(client, data);
// 3.1
// emit event
self.emit('NS.SEP.SEP_OPC_ALL_USR_OFFER', {client: mineclnt, data: data});
});
}
break;
case SEP.SEP_OPC_ALL_LOGIN_OFFER:
// 1.
// check if user was allowed to query it
// TBD... disable it by now
var _tbd_disable_alllogin = true;