Mercurial > libervia-backend
annotate src/plugins/plugin_xep_0260.py @ 2498:d6de69da3dd4
core (client): component improvments:
- renamed component boolean to is_component for more clarity
- profileConnected/profileDisconnected don't use a suffix anymore, it's called for both client and component.
To check for there, the is_component boolean is enough
- fixed dependencies handling
- componentStart is not mandatory anymore, as a component can just be used with its handler
| author | Goffi <goffi@goffi.org> |
|---|---|
| date | Wed, 28 Feb 2018 18:28:39 +0100 |
| parents | e2a7bb875957 |
| children | 67cc54b01a12 |
| rev | line source |
|---|---|
|
1934
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1 #!/usr/bin/env python2 |
| 1560 | 2 # -*- coding: utf-8 -*- |
| 3 | |
| 4 # SAT plugin for Jingle (XEP-0260) | |
| 2483 | 5 # Copyright (C) 2009-2018 Jérôme Poisson (goffi@goffi.org) |
| 1560 | 6 |
| 7 # This program is free software: you can redistribute it and/or modify | |
| 8 # it under the terms of the GNU Affero General Public License as published by | |
| 9 # the Free Software Foundation, either version 3 of the License, or | |
| 10 # (at your option) any later version. | |
| 11 | |
| 12 # This program is distributed in the hope that it will be useful, | |
| 13 # but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 15 # GNU Affero General Public License for more details. | |
| 16 | |
| 17 # You should have received a copy of the GNU Affero General Public License | |
| 18 # along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| 19 | |
| 20 from sat.core.i18n import _ | |
|
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21 from sat.core.constants import Const as C |
| 1560 | 22 from sat.core.log import getLogger |
| 23 log = getLogger(__name__) | |
| 24 from sat.core import exceptions | |
| 25 from wokkel import disco, iwokkel | |
| 26 from zope.interface import implements | |
| 27 from twisted.words.xish import domish | |
| 28 from twisted.words.protocols.jabber import jid | |
| 29 from twisted.internet import defer | |
| 30 import uuid | |
| 31 | |
| 32 try: | |
| 33 from twisted.words.protocols.xmlstream import XMPPHandler | |
| 34 except ImportError: | |
| 35 from wokkel.subprotocols import XMPPHandler | |
| 36 | |
| 37 | |
| 38 NS_JINGLE_S5B = 'urn:xmpp:jingle:transports:s5b:1' | |
| 39 | |
| 40 PLUGIN_INFO = { | |
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41 C.PI_NAME: "Jingle SOCKS5 Bytestreams", |
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42 C.PI_IMPORT_NAME: "XEP-0260", |
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43 C.PI_TYPE: "XEP", |
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44 C.PI_PROTOCOLS: ["XEP-0260"], |
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45 C.PI_DEPENDENCIES: ["XEP-0166", "XEP-0065"], |
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46 C.PI_RECOMMENDATIONS: ["XEP-0261"], # needed for fallback |
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47 C.PI_MAIN: "XEP_0260", |
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48 C.PI_HANDLER: "yes", |
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49 C.PI_DESCRIPTION: _("""Implementation of Jingle SOCKS5 Bytestreams""") |
| 1560 | 50 } |
| 51 | |
| 52 | |
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53 class ProxyError(Exception): |
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54 |
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55 def __str__(self): |
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56 return "an error happened while trying to use the proxy" |
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57 |
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58 |
| 1560 | 59 class XEP_0260(object): |
| 60 # TODO: udp handling | |
| 61 | |
| 62 def __init__(self, host): | |
| 63 log.info(_("plugin Jingle SOCKS5 Bytestreams")) | |
| 64 self.host = host | |
| 65 self._j = host.plugins["XEP-0166"] # shortcut to access jingle | |
| 66 self._s5b = host.plugins["XEP-0065"] # and socks5 bytestream | |
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67 try: |
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68 self._jingle_ibb = host.plugins["XEP-0261"] |
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69 except KeyError: |
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70 self._jingle_ibb = None |
| 1560 | 71 self._j.registerTransport(NS_JINGLE_S5B, self._j.TRANSPORT_STREAMING, self, 100) |
| 72 | |
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73 def getHandler(self, client): |
| 1560 | 74 return XEP_0260_handler() |
| 75 | |
| 76 def _parseCandidates(self, transport_elt): | |
| 77 """Parse <candidate> elements | |
| 78 | |
| 79 @param transport_elt(domish.Element): parent <transport> element | |
| 80 @return (list[plugin_xep_0065.Candidate): list of parsed candidates | |
| 81 """ | |
| 82 candidates = [] | |
| 83 for candidate_elt in transport_elt.elements(NS_JINGLE_S5B, 'candidate'): | |
| 84 try: | |
| 85 cid = candidate_elt['cid'] | |
| 86 host = candidate_elt['host'] | |
| 87 jid_= jid.JID(candidate_elt['jid']) | |
| 88 port = int(candidate_elt.getAttribute('port', 1080)) | |
| 89 priority = int(candidate_elt['priority']) | |
| 90 type_ = candidate_elt.getAttribute('type', self._s5b.TYPE_DIRECT) | |
| 91 except (KeyError, ValueError): | |
| 92 raise exceptions.DataError() | |
| 93 candidate = self._s5b.Candidate(host, port, type_, priority, jid_, cid) | |
| 94 candidates.append(candidate) | |
| 95 # self._s5b.registerCandidate(candidate) | |
| 96 return candidates | |
| 97 | |
| 98 def _buildCandidates(self, session, candidates, sid, session_hash, client, mode=None): | |
| 99 """Build <transport> element with candidates | |
| 100 | |
| 101 @param session(dict): jingle session data | |
| 102 @param candidates(iterator[plugin_xep_0065.Candidate]): iterator of candidates to add | |
| 103 @param sid(unicode): transport stream id | |
| 104 @param client: %(doc_client)s | |
| 105 @param mode(str, None): 'tcp' or 'udp', or None to have no attribute | |
| 106 @return (domish.Element): parent <transport> element where <candidate> elements must be added | |
| 107 """ | |
| 108 proxy = next((candidate for candidate in candidates if candidate.type == self._s5b.TYPE_PROXY), None) | |
| 109 transport_elt = domish.Element((NS_JINGLE_S5B, "transport")) | |
| 110 transport_elt['sid'] = sid | |
| 111 if proxy is not None: | |
| 112 transport_elt['dstaddr'] = session_hash | |
| 113 if mode is not None: | |
| 114 transport_elt['mode'] = 'tcp' # XXX: we only manage tcp for now | |
| 115 | |
| 116 for candidate in candidates: | |
| 117 log.debug(u"Adding candidate: {}".format(candidate)) | |
| 118 candidate_elt = transport_elt.addElement('candidate', NS_JINGLE_S5B) | |
| 119 if candidate.id is None: | |
| 120 candidate.id = unicode(uuid.uuid4()) | |
| 121 candidate_elt['cid'] = candidate.id | |
| 122 candidate_elt['host'] = candidate.host | |
| 123 candidate_elt['jid'] = candidate.jid.full() | |
| 124 candidate_elt['port'] = unicode(candidate.port) | |
| 125 candidate_elt['priority'] = unicode(candidate.priority) | |
| 126 candidate_elt['type'] = candidate.type | |
| 127 return transport_elt | |
| 128 | |
| 129 @defer.inlineCallbacks | |
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130 def jingleSessionInit(self, client, session, content_name): |
| 1560 | 131 content_data = session['contents'][content_name] |
| 132 transport_data = content_data['transport_data'] | |
| 133 sid = transport_data['sid'] = unicode(uuid.uuid4()) | |
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134 session_hash = transport_data['session_hash'] = self._s5b.getSessionHash(client.jid, session['peer_jid'], sid) |
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135 transport_data['peer_session_hash'] = self._s5b.getSessionHash(session['peer_jid'], client.jid, sid) # requester and target are inversed for peer candidates |
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136 transport_data['stream_d'] = self._s5b.registerHash(client, session_hash, None) |
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137 candidates = transport_data['candidates'] = yield self._s5b.getCandidates(client) |
| 1560 | 138 mode = 'tcp' # XXX: we only manage tcp for now |
| 139 transport_elt = self._buildCandidates(session, candidates, sid, session_hash, client, mode) | |
| 140 | |
| 141 defer.returnValue(transport_elt) | |
| 142 | |
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143 def _proxyActivatedCb(self, iq_result_elt, client, candidate, session, content_name): |
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144 """Called when activation confirmation has been received from proxy |
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145 |
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146 cf XEP-0260 § 2.4 |
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147 """ |
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148 # now that the proxy is activated, we have to inform other peer |
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149 iq_elt, transport_elt = self._j.buildAction(client, self._j.A_TRANSPORT_INFO, session, content_name) |
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150 activated_elt = transport_elt.addElement('activated') |
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151 activated_elt['cid'] = candidate.id |
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152 iq_elt.send() |
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153 |
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154 def _proxyActivatedEb(self, stanza_error, client, candidate, session, content_name): |
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155 """Called when activation error has been received from proxy |
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156 |
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157 cf XEP-0260 § 2.4 |
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158 """ |
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159 # TODO: fallback to IBB |
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160 # now that the proxy is activated, we have to inform other peer |
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161 iq_elt, transport_elt = self._j.buildAction(client, self._j.A_TRANSPORT_INFO, session, content_name) |
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162 transport_elt.addElement('proxy-error') |
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163 iq_elt.send() |
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164 log.warning(u"Can't activate proxy, we need to fallback to IBB: {reason}" |
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165 .format(reason = stanza_error.value.condition)) |
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166 self.doFallback(session, content_name, client) |
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167 |
| 1560 | 168 def _foundPeerCandidate(self, candidate, session, transport_data, content_name, client): |
| 169 """Called when the best candidate from other peer is found | |
| 170 | |
| 171 @param candidate(XEP_0065.Candidate, None): selected candidate, | |
| 172 or None if no candidate is accessible | |
| 173 @param session(dict): session data | |
| 174 @param transport_data(dict): transport data | |
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175 @param content_name(unicode): name of the current content |
| 1560 | 176 @param client(unicode): %(doc_client)s |
| 177 """ | |
| 178 | |
| 179 transport_data['best_candidate'] = candidate | |
| 180 # we need to disconnect all non selected candidates before removing them | |
| 181 for c in transport_data['peer_candidates']: | |
| 182 if c is None or c is candidate: | |
| 183 continue | |
| 184 c.discard() | |
| 185 del transport_data['peer_candidates'] | |
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186 iq_elt, transport_elt = self._j.buildAction(client, self._j.A_TRANSPORT_INFO, session, content_name) |
| 1560 | 187 if candidate is None: |
| 188 log.warning(u"Can't connect to any peer candidate") | |
| 189 candidate_elt = transport_elt.addElement('candidate-error') | |
| 190 else: | |
| 191 log.info(u"Found best peer candidate: {}".format(unicode(candidate))) | |
| 192 candidate_elt = transport_elt.addElement('candidate-used') | |
| 193 candidate_elt['cid'] = candidate.id | |
| 194 iq_elt.send() # TODO: check result stanza | |
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195 self._checkCandidates(session, content_name, transport_data, client) |
| 1560 | 196 |
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197 def _checkCandidates(self, session, content_name, transport_data, client): |
| 1560 | 198 """Called when a candidate has been choosed |
| 199 | |
| 200 if we have both candidates, we select one, or fallback to an other transport | |
| 201 @param session(dict): session data | |
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202 @param content_name(unicode): name of the current content |
| 1560 | 203 @param transport_data(dict): transport data |
| 204 @param client(unicode): %(doc_client)s | |
| 205 """ | |
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206 content_data = session['contents'][content_name] |
| 1560 | 207 try: |
| 208 best_candidate = transport_data['best_candidate'] | |
| 209 except KeyError: | |
| 210 # we have not our best candidate yet | |
| 211 return | |
| 212 try: | |
| 213 peer_best_candidate = transport_data['peer_best_candidate'] | |
| 214 except KeyError: | |
| 215 # we have not peer best candidate yet | |
| 216 return | |
| 217 | |
| 218 # at this point we have both candidates, it's time to choose one | |
| 219 if best_candidate is None or peer_best_candidate is None: | |
| 220 choosed_candidate = best_candidate or peer_best_candidate | |
| 221 else: | |
| 222 if best_candidate.priority == peer_best_candidate.priority: | |
| 223 # same priority, we choose initiator one according to XEP-0260 §2.4 #4 | |
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224 log.debug(u"Candidates have same priority, we select the one choosed by initiator") |
| 1560 | 225 if session['initiator'] == client.jid: |
| 226 choosed_candidate = best_candidate | |
| 227 else: | |
| 228 choosed_candidate = peer_best_candidate | |
| 229 else: | |
| 230 choosed_candidate = max(best_candidate, peer_best_candidate, key=lambda c:c.priority) | |
| 231 | |
| 232 if choosed_candidate is None: | |
| 233 log.warning(u"Socks5 negociation failed, we need to fallback to IBB") | |
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234 self.doFallback(session, content_name, client) |
| 1560 | 235 else: |
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236 if choosed_candidate == peer_best_candidate: |
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237 # peer_best_candidate was choosed from the candidates we have sent |
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238 # so our_candidate is true if choosed_candidate is peer_best_candidate |
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239 our_candidate = True |
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240 # than also mean that best_candidate must be discarded ! |
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241 try: |
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242 best_candidate.discard() |
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243 except AttributeError: # but it can be None |
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244 pass |
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245 else: |
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246 our_candidate = False |
| 1560 | 247 |
| 248 log.info(u"Socks5 negociation successful, {who} candidate will be used: {candidate}".format( | |
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249 who = u'our' if our_candidate else u'other peer', |
| 1560 | 250 candidate = choosed_candidate)) |
| 251 del transport_data['best_candidate'] | |
| 252 del transport_data['peer_best_candidate'] | |
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253 |
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254 if choosed_candidate.type == self._s5b.TYPE_PROXY: |
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255 # the stream transfer need to wait for proxy activation |
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256 # (see XEP-0260 § 2.4) |
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257 if our_candidate: |
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258 d = self._s5b.connectCandidate(client, choosed_candidate, transport_data['session_hash']) |
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259 d.addCallback(lambda dummy: choosed_candidate.activate(transport_data['sid'], session['peer_jid'], client)) |
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260 args = [client, choosed_candidate, session, content_name] |
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261 d.addCallbacks(self._proxyActivatedCb, self._proxyActivatedEb, args, None, args) |
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262 else: |
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263 # this Deferred will be called when we'll receive activation confirmation from other peer |
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264 d = transport_data['activation_d'] = defer.Deferred() |
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265 else: |
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266 d = defer.succeed(None) |
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267 |
| 1560 | 268 if content_data['senders'] == session['role']: |
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269 # we can now start the stream transfer (or start it after proxy activation) |
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270 d.addCallback(lambda dummy: choosed_candidate.startTransfer(transport_data['session_hash'])) |
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271 d.addErrback(self._startEb, session, content_name, client) |
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272 |
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273 def _startEb(self, fail, session, content_name, client): |
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274 """Called when it's not possible to start the transfer |
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275 |
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276 Will try to fallback to IBB |
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277 """ |
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278 try: |
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279 reason = unicode(fail.value) |
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280 except AttributeError: |
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281 reason = unicode(fail) |
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282 log.warning(u"Cant start transfert, we'll try fallback method: {}".format(reason)) |
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283 self.doFallback(session, content_name, client) |
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284 |
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285 def _candidateInfo(self, candidate_elt, session, content_name, transport_data, client): |
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286 """Called when best candidate has been received from peer (or if none is working) |
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287 |
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288 @param candidate_elt(domish.Element): candidate-used or candidate-error element |
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289 (see XEP-0260 §2.3) |
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290 @param session(dict): session data |
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291 @param content_name(unicode): name of the current content |
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292 @param transport_data(dict): transport data |
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293 @param client(unicode): %(doc_client)s |
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294 """ |
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295 if candidate_elt.name == 'candidate-error': |
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296 # candidate-error, no candidate worked |
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297 transport_data['peer_best_candidate'] = None |
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298 else: |
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299 # candidate-used, one candidate was choosed |
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300 try: |
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301 cid = candidate_elt.attributes['cid'] |
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302 except KeyError: |
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303 log.warning(u"No cid found in <candidate-used>") |
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304 raise exceptions.DataError |
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305 try: |
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306 candidate = (c for c in transport_data['candidates'] if c.id == cid).next() |
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307 except StopIteration: |
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308 log.warning(u"Given cid doesn't correspond to any known candidate !") |
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309 raise exceptions.DataError # TODO: send an error to other peer, and use better exception |
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310 except KeyError: |
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311 # a transport-info can also be intentionaly sent too early by other peer |
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312 # but there is little probability |
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313 log.error(u'"candidates" key doesn\'t exists in transport_data, it should at this point') |
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314 raise exceptions.InternalError |
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315 # at this point we have the candidate choosed by other peer |
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316 transport_data['peer_best_candidate'] = candidate |
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317 log.info(u"Other peer best candidate: {}".format(candidate)) |
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318 |
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319 del transport_data['candidates'] |
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320 self._checkCandidates(session, content_name, transport_data, client) |
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321 |
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322 def _proxyActivationInfo(self, proxy_elt, session, content_name, transport_data, client): |
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323 """Called when proxy has been activated (or has sent an error) |
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324 |
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325 @param proxy_elt(domish.Element): <activated/> or <proxy-error/> element |
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326 (see XEP-0260 §2.4) |
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327 @param session(dict): session data |
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328 @param content_name(unicode): name of the current content |
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329 @param transport_data(dict): transport data |
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330 @param client(unicode): %(doc_client)s |
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331 """ |
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332 try: |
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333 activation_d = transport_data.pop('activation_d') |
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334 except KeyError: |
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335 log.warning(u"Received unexpected transport-info for proxy activation") |
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336 |
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337 if proxy_elt.name == 'activated': |
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338 activation_d.callback(None) |
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339 else: |
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340 activation_d.errback(ProxyError()) |
| 1560 | 341 |
| 342 @defer.inlineCallbacks | |
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343 def jingleHandler(self, client, action, session, content_name, transport_elt): |
| 1560 | 344 content_data = session['contents'][content_name] |
| 345 transport_data = content_data['transport_data'] | |
| 346 | |
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347 if action in (self._j.A_ACCEPTED_ACK, self._j.A_PREPARE_RESPONDER): |
| 1560 | 348 pass |
| 349 | |
| 350 elif action == self._j.A_SESSION_ACCEPT: | |
| 351 # initiator side, we select a candidate in the ones sent by responder | |
| 352 assert 'peer_candidates' not in transport_data | |
| 353 transport_data['peer_candidates'] = self._parseCandidates(transport_elt) | |
| 354 | |
| 355 elif action == self._j.A_START: | |
| 356 session_hash = transport_data['session_hash'] | |
| 357 peer_candidates = transport_data['peer_candidates'] | |
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358 stream_object = content_data['stream_object'] |
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359 self._s5b.associateStreamObject(client, session_hash, stream_object) |
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360 stream_d = transport_data.pop('stream_d') |
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361 stream_d.chainDeferred(content_data['finished_d']) |
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362 peer_session_hash = transport_data['peer_session_hash'] |
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363 d = self._s5b.getBestCandidate(client, peer_candidates, session_hash, peer_session_hash) |
| 1560 | 364 d.addCallback(self._foundPeerCandidate, session, transport_data, content_name, client) |
| 365 | |
| 366 elif action == self._j.A_SESSION_INITIATE: | |
| 367 # responder side, we select a candidate in the ones sent by initiator | |
| 368 # and we give our candidates | |
| 369 assert 'peer_candidates' not in transport_data | |
| 370 sid = transport_data['sid'] = transport_elt['sid'] | |
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371 session_hash = transport_data['session_hash'] = self._s5b.getSessionHash(client.jid, session['peer_jid'], sid) |
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372 peer_session_hash = transport_data['peer_session_hash'] = self._s5b.getSessionHash(session['peer_jid'], client.jid, sid) # requester and target are inversed for peer candidates |
| 1560 | 373 peer_candidates = transport_data['peer_candidates'] = self._parseCandidates(transport_elt) |
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374 stream_object = content_data['stream_object'] |
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375 stream_d = self._s5b.registerHash(client, session_hash, stream_object) |
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376 stream_d.chainDeferred(content_data['finished_d']) |
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377 d = self._s5b.getBestCandidate(client, peer_candidates, session_hash, peer_session_hash) |
| 1560 | 378 d.addCallback(self._foundPeerCandidate, session, transport_data, content_name, client) |
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379 candidates = yield self._s5b.getCandidates(client) |
| 1560 | 380 # we remove duplicate candidates |
| 381 candidates = [candidate for candidate in candidates if candidate not in peer_candidates] | |
| 382 | |
| 383 transport_data['candidates'] = candidates | |
| 384 # we can now build a new <transport> element with our candidates | |
| 385 transport_elt = self._buildCandidates(session, candidates, sid, session_hash, client) | |
| 386 | |
| 387 elif action == self._j.A_TRANSPORT_INFO: | |
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388 # transport-info can be about candidate or proxy activation |
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389 candidate_elt = None |
| 1560 | 390 |
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391 for method, names in ((self._candidateInfo, ('candidate-used', 'candidate-error')), |
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392 (self._proxyActivationInfo, ('activated', 'proxy-error'))): |
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393 for name in names: |
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394 try: |
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395 candidate_elt = transport_elt.elements(NS_JINGLE_S5B, name).next() |
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396 except StopIteration: |
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397 continue |
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398 else: |
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399 method(candidate_elt, session, content_name, transport_data, client) |
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400 break |
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401 |
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402 if candidate_elt is None: |
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403 log.warning(u"Unexpected transport element: {}".format(transport_elt.toXml())) |
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404 elif action == self._j.A_DESTROY: |
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405 # the transport is replaced (fallback ?), We need mainly to kill XEP-0065 session. |
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406 # note that sid argument is not necessary for sessions created by this plugin |
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407 self._s5b.killSession(None, transport_data['session_hash'], None, client) |
| 1560 | 408 else: |
| 409 log.warning(u"FIXME: unmanaged action {}".format(action)) | |
| 410 | |
| 411 defer.returnValue(transport_elt) | |
| 412 | |
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413 def jingleTerminate(self, client, action, session, content_name, reason_elt): |
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414 if reason_elt.decline: |
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415 log.debug(u"Session declined, deleting S5B session") |
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416 # we just need to clean the S5B session if it is declined |
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417 content_data = session['contents'][content_name] |
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418 transport_data = content_data['transport_data'] |
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419 self._s5b.killSession(None, transport_data['session_hash'], None, client) |
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420 |
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421 def _doFallback(self, feature_checked, session, content_name, client): |
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422 """Do the fallback, method called once feature is checked |
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423 |
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424 @param feature_checked(bool): True if other peer can do IBB |
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425 """ |
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426 if not feature_checked: |
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427 log.warning(u"Other peer can't manage jingle IBB, be have to terminate the session") |
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428 self._j.terminate(client, self._j.REASON_CONNECTIVITY_ERROR, session) |
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429 else: |
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430 self._j.transportReplace(client, self._jingle_ibb.NAMESPACE, session, content_name) |
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431 |
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432 def doFallback(self, session, content_name, client): |
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433 """Fallback to IBB transport, used in last resort |
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434 |
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435 @param session(dict): session data |
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436 @param content_name(unicode): name of the current content |
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437 @param client(unicode): %(doc_client)s |
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438 """ |
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439 if session['role'] != self._j.ROLE_INITIATOR: |
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440 # only initiator must do the fallback, see XEP-0260 §3 |
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441 return |
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442 if self._jingle_ibb is None: |
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443 log.warning(u"Jingle IBB (XEP-0261) plugin is not available, we have to close the session") |
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444 self._j.terminate(client, self._j.REASON_CONNECTIVITY_ERROR, session) |
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445 else: |
|
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446 d = self.host.hasFeature(client, self._jingle_ibb.NAMESPACE, session['peer_jid']) |
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447 d.addCallback(self._doFallback, session, content_name, client) |
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448 return d |
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449 |
| 1560 | 450 |
| 451 class XEP_0260_handler(XMPPHandler): | |
| 452 implements(iwokkel.IDisco) | |
| 453 | |
| 454 def getDiscoInfo(self, requestor, target, nodeIdentifier=''): | |
| 455 return [disco.DiscoFeature(NS_JINGLE_S5B)] | |
| 456 | |
| 457 def getDiscoItems(self, requestor, target, nodeIdentifier=''): | |
| 458 return [] |