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sip.js
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sip.js
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var util = require('util');
var net = require('net');
var dns = require('dns');
var assert = require('assert');
var dgram = require('dgram');
var tls = require('tls');
var os = require('os');
var crypto = require('crypto');
var WebSocket = require('ws');
function debug(e) {
if(e.stack) {
util.debug(e + '\n' + e.stack);
}
else
util.debug(util.inspect(e));
}
function toBase64(s) {
switch(s.length % 3) {
case 1:
s += ' ';
break;
case 2:
s += ' ';
break;
default:
}
return (new Buffer.from(s)).toString('base64').replace(/\//g, '_').replace(/\+/g, '-');
}
// Actual stack code begins here
function parseResponse(rs, m) {
var r = rs.match(/^SIP\/(\d+\.\d+)\s+(\d+)\s*(.*)\s*$/);
if(r) {
m.version = r[1];
m.status = +r[2];
m.reason = r[3];
return m;
}
}
function parseRequest(rq, m) {
var r = rq.match(/^([\w\-.!%*_+`'~]+)\s([^\s]+)\sSIP\s*\/\s*(\d+\.\d+)/);
if(r) {
m.method = unescape(r[1]);
m.uri = r[2];
m.version = r[3];
return m;
}
}
function applyRegex(regex, data) {
regex.lastIndex = data.i;
var r = regex.exec(data.s);
if(r && (r.index === data.i)) {
data.i = regex.lastIndex;
return r;
}
}
function parseParams(data, hdr) {
hdr.params = hdr.params || {};
var re = /\s*;\s*([\w\-.!%*_+`'~]+)(?:\s*=\s*([\w\-.!%*_+`'~]+|"[^"\\]*(\\.[^"\\]*)*"))?/g;
for(var r = applyRegex(re, data); r; r = applyRegex(re, data)) {
hdr.params[r[1].toLowerCase()] = r[2] || null;
}
return hdr;
}
function parseMultiHeader(parser, d, h) {
h = h || [];
var re = /\s*,\s*/g;
do {
h.push(parser(d));
} while(d.i < d.s.length && applyRegex(re, d));
return h;
}
function parseGenericHeader(d, h) {
return h ? h + ',' + d.s : d.s;
}
function parseAOR(data) {
var r = applyRegex(/((?:[\w\-.!%*_+`'~]+)(?:\s+[\w\-.!%*_+`'~]+)*|"[^"\\]*(?:\\.[^"\\]*)*")?\s*\<\s*([^>]*)\s*\>|((?:[^\s@"<]@)?[^\s;]+)/g, data);
return parseParams(data, {name: r[1], uri: r[2] || r[3] || ''});
}
exports.parseAOR = parseAOR;
function parseAorWithUri(data) {
var r = parseAOR(data);
r.uri = parseUri(r.uri);
return r;
}
function parseVia(data) {
var r = applyRegex(/SIP\s*\/\s*(\d+\.\d+)\s*\/\s*([\S]+)\s+([^\s;:]+)(?:\s*:\s*(\d+))?/g, data);
return parseParams(data, {version: r[1], protocol: r[2], host: r[3], port: r[4] && +r[4]});
}
function parseCSeq(d) {
var r = /(\d+)\s*([\S]+)/.exec(d.s);
return { seq: +r[1], method: unescape(r[2]) };
}
function parseAuthHeader(d) {
var r1 = applyRegex(/([^\s]*)\s+/g, d);
var a = {scheme: r1[1]};
var r2 = applyRegex(/([^\s,"=]*)\s*=\s*([^\s,"]+|"[^"\\]*(?:\\.[^"\\]*)*")\s*/g, d);
a[r2[1]]=r2[2];
while(r2 = applyRegex(/,\s*([^\s,"=]*)\s*=\s*([^\s,"]+|"[^"\\]*(?:\\.[^"\\]*)*")\s*/g, d)) {
a[r2[1]]=r2[2];
}
return a;
}
function parseAuthenticationInfoHeader(d) {
var a = {};
var r = applyRegex(/([^\s,"=]*)\s*=\s*([^\s,"]+|"[^"\\]*(?:\\.[^"\\]*)*")\s*/g, d);
a[r[1]]=r[2];
while(r = applyRegex(/,\s*([^\s,"=]*)\s*=\s*([^\s,"]+|"[^"\\]*(?:\\.[^"\\]*)*")\s*/g, d)) {
a[r[1]]=r[2];
}
return a;
}
var compactForm = {
i: 'call-id',
m: 'contact',
e: 'contact-encoding',
l: 'content-length',
c: 'content-type',
f: 'from',
s: 'subject',
k: 'supported',
t: 'to',
v: 'via'
};
var parsers = {
'to': parseAOR,
'from': parseAOR,
'contact': function(v, h) {
if(v == '*')
return v;
else
return parseMultiHeader(parseAOR, v, h);
},
'route': parseMultiHeader.bind(0, parseAorWithUri),
'record-route': parseMultiHeader.bind(0, parseAorWithUri),
'path': parseMultiHeader.bind(0, parseAorWithUri),
'cseq': parseCSeq,
'content-length': function(v) { return +v.s; },
'via': parseMultiHeader.bind(0, parseVia),
'www-authenticate': parseMultiHeader.bind(0, parseAuthHeader),
'proxy-authenticate': parseMultiHeader.bind(0, parseAuthHeader),
'authorization': parseMultiHeader.bind(0, parseAuthHeader),
'proxy-authorization': parseMultiHeader.bind(0, parseAuthHeader),
'authentication-info': parseAuthenticationInfoHeader,
'refer-to': parseAOR
};
function parse(data) {
data = data.split(/\r\n(?![ \t])/);
if(data[0] === '')
return;
var m = {};
if(!(parseResponse(data[0], m) || parseRequest(data[0], m)))
return;
m.headers = {};
for(var i = 1; i < data.length; ++i) {
var r = data[i].match(/^([\S]*?)\s*:\s*([\s\S]*)$/);
if(!r) {
return;
}
var name = unescape(r[1]).toLowerCase();
name = compactForm[name] || name;
try {
m.headers[name] = (parsers[name] || parseGenericHeader)({s:r[2], i:0}, m.headers[name]);
}
catch(e) {}
}
return m;
}
function parseUri(s) {
if(typeof s === 'object')
return s;
var re = /^(sips?):(?:([^\s>:@]+)(?::([^\s@>]+))?@)?([\w\-\.]+)(?::(\d+))?((?:;[^\s=\?>;]+(?:=[^\s?\;]+)?)*)(?:\?(([^\s&=>]+=[^\s&=>]+)(&[^\s&=>]+=[^\s&=>]+)*))?$/;
var r = re.exec(s);
if(r) {
return {
schema: r[1],
user: r[2],
password: r[3],
host: r[4],
port: +r[5],
params: (r[6].match(/([^;=]+)(=([^;=]+))?/g) || [])
.map(function(s) { return s.split('='); })
.reduce(function(params, x) { params[x[0]]=x[1] || null; return params;}, {}),
headers: ((r[7] || '').match(/[^&=]+=[^&=]+/g) || [])
.map(function(s){ return s.split('=') })
.reduce(function(params, x) { params[x[0]]=x[1]; return params; }, {})
}
}
}
exports.parseUri = parseUri;
function stringifyVersion(v) {
return v || '2.0';
}
function stringifyParams(params) {
var s = '';
for(var n in params) {
s += ';'+n+(params[n]?'='+params[n]:'');
}
return s;
}
function stringifyUri(uri) {
if(typeof uri === 'string')
return uri;
var s = (uri.schema || 'sip') + ':';
if(uri.user) {
if(uri.password)
s += uri.user + ':' + uri.password + '@';
else
s += uri.user + '@';
}
s += uri.host;
if(uri.port)
s += ':' + uri.port;
if(uri.params)
s += stringifyParams(uri.params);
if(uri.headers) {
var h = Object.keys(uri.headers).map(function(x){return x+'='+uri.headers[x];}).join('&');
if(h.length)
s += '?' + h;
}
return s;
}
exports.stringifyUri = stringifyUri;
function stringifyAOR(aor) {
return (aor.name || '') + ' <' + stringifyUri(aor.uri) + '>'+stringifyParams(aor.params);
}
function stringifyAuthHeader(a) {
var s = [];
for(var n in a) {
if(n !== 'scheme' && a[n] !== undefined) {
s.push(n + '=' + a[n]);
}
}
return a.scheme ? a.scheme + ' ' + s.join(',') : s.join(',');
}
exports.stringifyAuthHeader = stringifyAuthHeader;
var stringifiers = {
via: function(h) {
return h.map(function(via) {
if(via.host) {
return 'Via: SIP/'+stringifyVersion(via.version)+'/'+via.protocol.toUpperCase()+' '+via.host+(via.port?':'+via.port:'')+stringifyParams(via.params)+'\r\n';
}
else {
return '';
}
}).join('');
},
to: function(h) {
return 'To: '+stringifyAOR(h) + '\r\n';
},
from: function(h) {
return 'From: '+stringifyAOR(h)+'\r\n';
},
contact: function(h) {
return 'Contact: '+ ((h !== '*' && h.length) ? h.map(stringifyAOR).join(', ') : '*') + '\r\n';
},
route: function(h) {
return h.length ? 'Route: ' + h.map(stringifyAOR).join(', ') + '\r\n' : '';
},
'record-route': function(h) {
return h.length ? 'Record-Route: ' + h.map(stringifyAOR).join(', ') + '\r\n' : '';
},
'path': function(h) {
return h.length ? 'Path: ' + h.map(stringifyAOR).join(', ') + '\r\n' : '';
},
cseq: function(cseq) {
return 'CSeq: '+cseq.seq+' '+cseq.method+'\r\n';
},
'www-authenticate': function(h) {
return h.map(function(x) { return 'WWW-Authenticate: '+stringifyAuthHeader(x)+'\r\n'; }).join('');
},
'proxy-authenticate': function(h) {
return h.map(function(x) { return 'Proxy-Authenticate: '+stringifyAuthHeader(x)+'\r\n'; }).join('');
},
'authorization': function(h) {
return h.map(function(x) { return 'Authorization: ' + stringifyAuthHeader(x) + '\r\n'}).join('');
},
'proxy-authorization': function(h) {
return h.map(function(x) { return 'Proxy-Authorization: ' + stringifyAuthHeader(x) + '\r\n'}).join('');;
},
'authentication-info': function(h) {
return 'Authentication-Info: ' + stringifyAuthHeader(h) + '\r\n';
},
'refer-to': function(h) { return 'Refer-To: ' + stringifyAOR(h) + '\r\n'; }
};
function prettifyHeaderName(s) {
if(s == 'call-id') return 'Call-ID';
return s.replace(/\b([a-z])/g, function(a) { return a.toUpperCase(); });
}
function stringify(m) {
var s;
if(m.status) {
s = 'SIP/' + stringifyVersion(m.version) + ' ' + m.status + ' ' + m.reason + '\r\n';
}
else {
s = m.method + ' ' + stringifyUri(m.uri) + ' SIP/' + stringifyVersion(m.version) + '\r\n';
}
m.headers['content-length'] = (m.content || '').length;
for(var n in m.headers) {
if(typeof m.headers[n] !== "undefined") {
if(typeof m.headers[n] === 'string' || !stringifiers[n])
s += prettifyHeaderName(n) + ': ' + m.headers[n] + '\r\n';
else
s += stringifiers[n](m.headers[n], n);
}
}
s += '\r\n';
if(m.content)
s += m.content;
return s;
}
exports.stringify = stringify;
function makeResponse(rq, status, reason, extension) {
var rs = {
status: status,
reason: reason || '',
version: rq.version,
headers: {
via: rq.headers.via,
to: rq.headers.to,
from: rq.headers.from,
'call-id': rq.headers['call-id'],
cseq: rq.headers.cseq
}
};
if(extension) {
if(extension.headers) Object.keys(extension.headers).forEach(function(h) { rs.headers[h] = extension.headers[h]; });
rs.content = extension.content;
}
return rs;
}
exports.makeResponse = makeResponse;
function clone(o, deep) {
if(o !== null && typeof o === 'object') {
var r = Array.isArray(o) ? [] : {};
Object.keys(o).forEach(function(k) { r[k] = deep ? clone(o[k], deep): o[k]; });
return r;
}
return o;
}
exports.copyMessage = function(msg, deep) {
if(deep) return clone(msg, true);
var r = {
uri: deep ? clone(msg.uri, deep) : msg.uri,
method: msg.method,
status: msg.status,
reason: msg.reason,
headers: clone(msg.headers, deep),
content: msg.content
};
// always copy via array
r.headers.via = clone(msg.headers.via);
return r;
}
function defaultPort(proto) {
return proto.toUpperCase() === 'TLS' ? 5061 : 5060;
}
function makeStreamParser(onMessage, onFlood, maxBytesHeaders, maxContentLength) {
onFlood= onFlood || function(){};
maxBytesHeaders= maxBytesHeaders || 60480;
maxContentLength= maxContentLength || 604800;
var m;
var r = '';
function headers(data) {
r += data;
if( r.length > maxBytesHeaders ){
r = '';
onFlood();
return;
}
var a = r.match(/^\s*([\S\s]*?)\r\n\r\n([\S\s]*)$/);
if(a) {
r = a[2];
m = parse(a[1]);
if(m && m.headers['content-length'] !== undefined) {
if (m.headers['content-length'] > maxContentLength) {
r = '';
onFlood();
}
if (m.raw) {
m.raw = Buffer.concat([m.raw, data]); //stream.setEncoding('binary');
}
else {
m.raw = data;
}
state = content;
content('');
}
else
headers('');
}
}
function content(data) {
r += data;
if(r.length >= m.headers['content-length']) {
m.content = r.substring(0, m.headers['content-length']);
if (Buffer.isBuffer(m.raw)) {
m.raw = m.raw.subarray(0, m.headers['content-length']);
}
onMessage(m);
var s = r.substring(m.headers['content-length']);
state = headers;
r = '';
headers(s);
}
}
var state=headers;
return function(data) { state(data); }
}
exports.makeStreamParser = makeStreamParser;
function parseMessage(s) {
var r = s.toString('binary').match(/^\s*([\S\s]*?)\r\n\r\n([\S\s]*)$/);
if(r) {
var m = parse(r[1]);
if(m) {
if(m.headers['content-length']) {
var c = Math.max(0, Math.min(m.headers['content-length'], r[2].length));
m.content = r[2].substring(0, c);
}
else {
m.content = r[2];
}
m.raw = s;
return m;
}
}
}
exports.parse = parseMessage;
function checkMessage(msg) {
return (msg.method || (msg.status >= 100 && msg.status <= 999)) &&
msg.headers &&
Array.isArray(msg.headers.via) &&
msg.headers.via.length > 0 &&
msg.headers['call-id'] &&
msg.headers.to &&
msg.headers.from &&
msg.headers.cseq;
}
function makeStreamTransport(protocol, maxBytesHeaders, maxContentLength, connect, createServer, callback) {
var remotes = Object.create(null);
var flows = Object.create(null);
function init(stream, remote) {
var remoteid = [remote.address, remote.port].join(),
flowid = undefined,
refs = 0;
function register_flow() {
flowid = [remoteid,stream.localAddress, stream.localPort].join();
flows[flowid] = remotes[remoteid];
}
var onMessage= function(m) {
if(checkMessage(m)) {
if(m.method) m.headers.via[0].params.received = remote.address;
callback(m,
{protocol: remote.protocol, address: stream.remoteAddress, port: stream.remotePort, local: { address: stream.localAddress, port: stream.localPort}},
stream);
}
};
var onFlood= function() {
console.log("Flood attempt, destroying stream");
stream.destroy();
};
stream.setEncoding('binary');
stream.on('data', makeStreamParser( onMessage, onFlood, maxBytesHeaders, maxContentLength));
stream.on('close', function() {
if(flowid) delete flows[flowid];
delete remotes[remoteid];
});
stream.on('connect', register_flow);
stream.on('error', function() {});
stream.on('end', function() {
if(refs !== 0) stream.emit('error', new Error('remote peer disconnected'));
stream.end();
});
stream.on('timeout', function() { if(refs === 0) stream.destroy(); });
stream.setTimeout(120000);
stream.setMaxListeners(10000);
remotes[remoteid] = function(onError) {
++refs;
if(onError) stream.on('error', onError);
return {
release: function() {
if(onError) stream.removeListener('error', onError);
if(--refs === 0) stream.emit('no_reference');
},
send: function(m) {
stream.write(stringify(m), 'binary');
},
protocol: protocol
}
};
if(stream.localPort) register_flow();
return remotes[remoteid];
}
var server = createServer(function(stream) {
init(stream, {protocol: protocol, address: stream.remoteAddress, port: stream.remotePort});
});
return {
open: function(remote, error) {
var remoteid = [remote.address, remote.port].join();
if(remoteid in remotes) return remotes[remoteid](error);
return init(connect(remote.port, remote.address), remote)(error);
},
get: function(address, error) {
var c = address.local ? flows[[address.address, address.port, address.local.address, address.local.port].join()]
: remotes[[address.address, address.port].join()];
return c && c(error);
},
destroy: function() { server.close(); }
};
}
function makeTlsTransport(options, callback) {
return makeStreamTransport(
'TLS',
options.maxBytesHeaders,
options.maxContentLength,
function(port, host, callback) { return tls.connect(port, host, options.tls, callback); },
function(callback) {
var server = tls.createServer(options.tls, callback);
server.listen(options.tls_port || 5061, options.address);
return server;
},
callback);
}
function makeTcpTransport(options, callback) {
return makeStreamTransport(
'TCP',
options.maxBytesHeaders,
options.maxContentLength,
function(port, host, callback) { return net.connect(port, host, callback); },
function(callback) {
var server = net.createServer(callback);
server.listen(options.port || 5060, options.address);
return server;
},
callback);
}
function makeWsTransport(options, callback) {
var flows = Object.create(null);
var clients = Object.create(null);
function init(ws) {
var remote = {address: ws._socket.remoteAddress, port: ws._socket.remotePort},
local = {address: ws._socket.address().address, port: ws._socket.address().port},
flowid = [remote.address, remote.port, local.address, local.port].join();
flows[flowid] = ws;
ws.on('close', function() { delete flows[flowid]; });
ws.on('message', function(data) {
var msg = parseMessage(data);
if(msg) {
callback(msg, {protocol: 'WS', address: remote.address, port: remote.port, local: local});
}
});
}
function makeClient(uri) {
if(clients[uri]) return clients[uri]();
var socket = new WebSocket(uri, 'sip', {procotol: 'sip'}),
queue = [],
refs = 0;
function send_connecting(m) { queue.push(stringify(m)); }
function send_open(m) { socket.send(new Buffer.from(typeof m === 'string' ? m : stringify(m), 'binary')); }
var send = send_connecting;
socket.on('open', function() {
init(socket);
send = send_open;
queue.splice(0).forEach(send);
});
function open(onError) {
++refs;
if(onError) socket.on('error', onError);
return {
send: function(m) { send(m); },
release: function() {
if(onError) socket.removeListener('error', onError);
if(--refs === 0) socket.terminate();
},
protocol: 'WS'
};
};
return clients[uri] = open;
}
if(options.ws_port) {
if(options.tls) {
var http = require('https');
var server = new WebSocket.Server({
server: http.createServer(options.tls, function(rq,rs) {
rs.writeHead(200);
rs.end("");
}).listen(options.ws_port)
});
}
else {
var server = new WebSocket.Server({port:options.ws_port});
}
server.on('connection',init);
}
function get(flow) {
var ws = flows[[flow.address, flow.port, flow.local.address, flow.local.port].join()];
if(ws) {
return {
send: function(m) { ws.send(stringify(m)); },
release: function() {},
protocol: 'WS'
};
} else {
console.log("Failed to get ws for target. Target/flow was:");
console.log(util.inspect(flow));
console.log("Flows[] were:");
console.log(util.inspect(flows));
}
}
function open(target, onError) {
if(target.local)
return get(target);
else
return makeClient('ws://'+target.host+':'+target.port)(onError);
}
return {
get: open,
open: open,
destroy: function() { server.close(); }
}
}
function makeUdpTransport(options, callback) {
function onMessage(data, rinfo) {
var msg = parseMessage(data);
if(msg && checkMessage(msg)) {
if(msg.method) {
msg.headers.via[0].params.received = rinfo.address;
if(msg.headers.via[0].params.hasOwnProperty('rport'))
msg.headers.via[0].params.rport = rinfo.port;
}
callback(msg, {protocol: 'UDP', address: rinfo.address, port: rinfo.port, local: {address: address, port: port}});
}
}
var address = options.address || '0.0.0.0';
var port = options.port || 5060;
var socket = dgram.createSocket(net.isIPv6(address) ? 'udp6' : 'udp4', onMessage);
socket.bind(port, address);
function open(remote, error) {
return {
send: function(m) {
var s = stringify(m);
socket.send(new Buffer.from(s, 'binary'), 0, s.length, remote.port, remote.address);
},
protocol: 'UDP',
release : function() {}
};
};
return {
open: open,
get: open,
destroy: function() { socket.close(); }
}
}
function makeTransport(options, callback) {
var protocols = {};
var callbackAndLog = callback;
if(options.logger && options.logger.recv) {
callbackAndLog = function(m, remote, stream) {
options.logger.recv(m, remote);
callback(m, remote, stream);
}
}
if(options.udp === undefined || options.udp)
protocols.UDP = makeUdpTransport(options, callbackAndLog);
if(options.tcp === undefined || options.tcp)
protocols.TCP = makeTcpTransport(options, callbackAndLog);
if(options.tls)
protocols.TLS = makeTlsTransport(options, callbackAndLog);
if(options.ws_port && WebSocket)
protocols.WS = makeWsTransport(options, callbackAndLog);
function wrap(obj, target) {
return Object.create(obj, {send: {value: function(m) {
if(m.method) {
m.headers.via[0].host = options.publicAddress || options.address || options.hostname || os.hostname();
m.headers.via[0].port = options.port || defaultPort(this.protocol);
m.headers.via[0].protocol = this.protocol;
if(this.protocol === 'UDP' && (!options.hasOwnProperty('rport') || options.rport)) {
m.headers.via[0].params.rport = null;
}
}
options.logger && options.logger.send && options.logger.send(m, target);
obj.send(m);
}}});
}
return {
open: function(target, error) {
return wrap(protocols[target.protocol.toUpperCase()].open(target, error), target);
},
get: function(target, error) {
var flow = protocols[target.protocol.toUpperCase()].get(target, error);
return flow && wrap(flow, target);
},
send: function(target, message) {
var cn = this.open(target);
try {
cn.send(message);
}
finally {
cn.release();
}
},
destroy: function() {
var protos = protocols;
protocols = [];
Object.keys(protos).forEach(function(key) { protos[key].destroy(); });
},
};
}
exports.makeTransport = makeTransport;
function makeWellBehavingResolver(resolve) {
var outstanding = Object.create(null);
return function(name, cb) {
if(outstanding[name]) {
outstanding[name].push(cb);
}
else {
outstanding[name] = [cb];
resolve(name, function() {
var o = outstanding[name];
delete outstanding[name];
var args = arguments;
o.forEach(function(x) { x.apply(null, args); });
});
}
};
};
var resolveSrv = makeWellBehavingResolver(dns.resolveSrv);
var resolve4 = makeWellBehavingResolver(dns.resolve4);
var resolve6 = makeWellBehavingResolver(dns.resolve6);
function resolve(uri, action) {
if(uri.params.transport === 'ws')
return action([{protocol: uri.schema === 'sips' ? 'WSS' : 'WS', host: uri.host, port: uri.port || (uri.schema === 'sips' ? 433 : 80)}]);
if(net.isIP(uri.host)) {
var protocol = uri.params.transport || 'UDP';
return action([{protocol: protocol, address: uri.host, port: uri.port || defaultPort(protocol)}]);
}
function resolve46(host, cb) {
resolve4(host, function(e4, a4) {
resolve6(host, function(e6, a6) {
if((a4 || a6) && (a4 || a6).length)
cb(null, (a4 || []).concat(a6 || []));
else
cb(e4 || e6, []);
});
});
}
if(uri.port) {
var protocols = uri.params.transport ? [uri.params.transport] : ['UDP', 'TCP', 'TLS'];
resolve46(uri.host, function(err, address) {
address = (address || []).map(function(x) { return protocols.map(function(p) { return { protocol: p, address: x, port: uri.port || defaultPort(p)};});})
.reduce(function(arr,v) { return arr.concat(v); }, []);
action(address);
});
}
else {
var protocols = uri.params.transport ? [uri.params.transport] : ['tcp', 'udp', 'tls'];
var n = protocols.length;
var addresses = [];
protocols.forEach(function(proto) {
resolveSrv('_sip._'+proto+'.'+uri.host, function(e, r) {
--n;
if(Array.isArray(r)) {
n += r.length;
r.forEach(function(srv) {
resolve46(srv.name, function(e, r) {
addresses = addresses.concat((r||[]).map(function(a) { return {protocol: proto, address: a, port: srv.port};}));
if((--n)===0) // all outstanding requests has completed
action(addresses);
});
});
}
else if(0 === n) {
if(addresses.length) {
action(addresses);
}
else {
// all srv requests failed
resolve46(uri.host, function(err, address) {
address = (address || []).map(function(x) { return protocols.map(function(p) { return { protocol: p, address: x, port: uri.port || defaultPort(p)};});})
.reduce(function(arr,v) { return arr.concat(v); }, []);
action(address);
});
}
}
})
});
}
}
exports.resolve = resolve;
//transaction layer
function generateBranch() {
return ['z9hG4bK',Math.round(Math.random()*1000000)].join('');
}
exports.generateBranch = generateBranch;
function makeSM() {
var state;
return {
enter: function(newstate) {
if(state && state.leave)
state.leave();
state = newstate;
Array.prototype.shift.apply(arguments);
if(state.enter)
state.enter.apply(this, arguments);
},
signal: function(s) {
if(state && state[s])
state[Array.prototype.shift.apply(arguments)].apply(state, arguments);
}
};
}
function createInviteServerTransaction(transport, cleanup) {
var sm = makeSM();
var rs;
var proceeding = {