server: ipv6 support

lib/common.js

@@ -4,6 +4,9 @@
 
 var querystring = require('querystring')
 
+exports.IPV4_RE = /^[\d\.]+$/
+exports.IPV6_RE = /^[\da-fA-F:]+$/
+
 exports.NUM_ANNOUNCE_PEERS = 50
 exports.MAX_ANNOUNCE_PEERS = 82
 

lib/parse_http.js

@@ -2,7 +2,7 @@ module.exports = parseHttpRequest
 
 var common = require('./common')
 
-var REMOVE_IPV6_RE = /^::ffff:/
+var REMOVE_IPV4_MAPPED_IPV6_RE = /^::ffff:/
 
 function parseHttpRequest (req, options) {
   var s = req.url.split('?')
@@ -30,8 +30,8 @@ function parseHttpRequest (req, options) {
 
     params.ip = options.trustProxy
       ? req.headers['x-forwarded-for'] || req.connection.remoteAddress
-      : req.connection.remoteAddress.replace(REMOVE_IPV6_RE, '') // force ipv4
+      : req.connection.remoteAddress.replace(REMOVE_IPV4_MAPPED_IPV6_RE, '') // force ipv4
-    params.addr = params.ip + ':' + params.port // TODO: ipv6 brackets?
+    params.addr = (common.IPV6_RE.test(params.ip) ? '[' + params.ip + ']' : params.ip) + ':' + params.port
 
   } else if (s[0] === '/scrape') { // unofficial scrape message
     params.action = common.ACTIONS.SCRAPE

server.js

@@ -94,7 +94,10 @@ Server.prototype.listen = function (port, onlistening) {
   function onPort (err, port) {
     if (err) return self.emit('error', err)
     self.port = port
-    self._httpServer && self._httpServer.listen(port.http || port)
+    // ATTENTION:
+    // binding to :: only receives IPv4 connections if the bindv6only
+    // sysctl is set 0, which is the default on many operating systems.
+    self._httpServer && self._httpServer.listen(port.http || port, '::')
     self._udpServer && self._udpServer.bind(port.udp || port)
   }
 
@@ -208,11 +211,23 @@ Server.prototype._onAnnounce = function (params, cb) {
     if (response) {
       if (!response.action) response.action = common.ACTIONS.ANNOUNCE
       if (!response.intervalMs) response.intervalMs = self._intervalMs
+      
       if (params.compact === 1) {
-        response.peers = string2compact(response.peers.map(function (peer) {
+        var peers = response.peers
-          return peer.ip + ':' + peer.port // TODO: ipv6 brackets
+        // Find IPv4 peers
+        response.peers = string2compact(peers.filter(function (peer) {
+          return common.IPV4_RE.test(peer.ip)
+        }).map(function (peer) {
+          return peer.ip + ':' + peer.port
+        }))
+        // Find IPv6 peers
+        response.peers6 = string2compact(peers.filter(function (peer) {
+          return common.IPV6_RE.test(peer.ip)
+        }).map(function (peer) {
+          return '[' + peer.ip + ']:' + peer.port
         }))
       }
+      // IPv6 peers are not separate for non-compact responses
     }
     cb(err, response)
   })

test/server.js

@@ -7,11 +7,14 @@ var peerId = new Buffer('01234567890123456789')
 var peerId2 = new Buffer('12345678901234567890')
 var torrentLength = 50000
 
-function serverTest (t, serverType) {
+function serverTest (t, serverType, serverFamily) {
   t.plan(26)
 
   var opts = serverType === 'http' ? { udp: false } : { http: false }
   var server = new Server(opts)
+  var serverAddr = serverFamily === 'inet6' ? '[::1]' : '127.0.0.1'
+  var clientAddr = serverFamily === 'inet6' ? '[::1]' : '127.0.0.1'
+  var clientIp = serverFamily === 'inet6' ? '::1' : '127.0.0.1'
 
   server.on('error', function (err) {
     t.fail(err.message)
@@ -26,7 +29,7 @@ function serverTest (t, serverType) {
   })
 
   server.listen(function (port) {
-    var announceUrl = serverType + '://127.0.0.1:' + port + '/announce'
+    var announceUrl = serverType + '://' + serverAddr + ':' + port + '/announce'
 
     var client = new Client(peerId, 6881, {
       infoHash: infoHash,
@@ -49,8 +52,8 @@ function serverTest (t, serverType) {
       t.equal(server.getSwarm(infoHash).complete, 0)
       t.equal(server.getSwarm(infoHash).incomplete, 1)
       t.equal(Object.keys(server.getSwarm(infoHash).peers).length, 1)
-      t.deepEqual(server.getSwarm(infoHash).peers['127.0.0.1:6881'], {
+      t.deepEqual(server.getSwarm(infoHash).peers[clientAddr + ':6881'], {
-        ip: '127.0.0.1',
+        ip: clientIp,
         port: 6881,
         peerId: peerId.toString('hex')
       })
@@ -83,7 +86,7 @@ function serverTest (t, serverType) {
           })
 
           client2.once('peer', function (addr) {
-            t.equal(addr, '127.0.0.1:6881')
+            t.equal(addr, clientAddr + ':6881')
 
             client2.stop()
             client2.once('update', function (data) {
@@ -109,10 +112,14 @@ function serverTest (t, serverType) {
   })
 }
 
-test('http server', function (t) {
+test('http ipv4 server', function (t) {
-  serverTest(t, 'http')
+  serverTest(t, 'http', 'inet')
+})
+
+test('http ipv6 server', function (t) {
+  serverTest(t, 'http', 'inet6')
 })
 
 test('udp server', function (t) {
-  serverTest(t, 'udp')
+  serverTest(t, 'udp', 'inet')
 })