annotate sat/plugins/plugin_misc_ip.py @ 3101:ab7e8ade848a

plugin XEP-0045: added room statuses to metadata: room statuses are now sent with other metadata on bridge signals, and saved in Room instance. They give useful data on the room, for instance they can be used to know if a full jid is used in this room.
author Goffi <goffi@goffi.org>
date Mon, 30 Dec 2019 20:44:02 +0100
parents ab2696e34d29
children b64dd7c1496d
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1 #!/usr/bin/env python3
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2 # -*- coding: utf-8 -*-
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3
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4 # SAT plugin for IP address discovery
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5 # Copyright (C) 2009-2019 Jérôme Poisson (goffi@goffi.org)
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6
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7 # This program is free software: you can redistribute it and/or modify
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8 # it under the terms of the GNU Affero General Public License as published by
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9 # the Free Software Foundation, either version 3 of the License, or
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10 # (at your option) any later version.
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11
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12 # This program is distributed in the hope that it will be useful,
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13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 # GNU Affero General Public License for more details.
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16
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17 # You should have received a copy of the GNU Affero General Public License
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18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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19
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20 import urllib.parse
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21 from sat.core.i18n import _, D_
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22 from sat.core.constants import Const as C
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23 from sat.core.log import getLogger
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24 from sat.tools import xml_tools
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25 from wokkel import disco, iwokkel
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26 from twisted.web import client as webclient
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27 from twisted.web import error as web_error
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28 from twisted.internet import defer
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29 from twisted.internet import reactor
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30 from twisted.internet import protocol
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31 from twisted.internet import endpoints
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32 from twisted.internet import error as internet_error
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33 from zope.interface import implementer
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34 from twisted.words.protocols.jabber.xmlstream import XMPPHandler
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35 from twisted.words.protocols.jabber.error import StanzaError
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36
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37 log = getLogger(__name__)
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38
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39 try:
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40 import netifaces
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41 except ImportError:
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42 log.warning(
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43 "netifaces is not available, it help discovering IPs, you can install it on https://pypi.python.org/pypi/netifaces"
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44 )
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45 netifaces = None
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47
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48 PLUGIN_INFO = {
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49 C.PI_NAME: "IP discovery",
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50 C.PI_IMPORT_NAME: "IP",
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51 C.PI_TYPE: C.PLUG_TYPE_MISC,
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52 C.PI_MODES: C.PLUG_MODE_BOTH,
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53 C.PI_PROTOCOLS: ["XEP-0279"],
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54 C.PI_RECOMMENDATIONS: ["NAT-PORT"],
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55 C.PI_MAIN: "IPPlugin",
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56 C.PI_HANDLER: "yes",
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57 C.PI_DESCRIPTION: _("""This plugin help to discover our external IP address."""),
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58 }
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59
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60 # TODO: GET_IP_PAGE should be configurable in sat.conf
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61 GET_IP_PAGE = (
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62 "http://salut-a-toi.org/whereami/"
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63 ) # This page must only return external IP of the requester
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64 GET_IP_LABEL = D_("Allow external get IP")
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65 GET_IP_CATEGORY = "General"
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66 GET_IP_NAME = "allow_get_ip"
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67 GET_IP_CONFIRM_TITLE = D_("Confirm external site request")
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68 GET_IP_CONFIRM = D_(
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69 """To facilitate data transfer, we need to contact a website.
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70 A request will be done on {page}
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71 That means that administrators of {domain} can know that you use "{app_name}" and your IP Address.
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72
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73 IP address is an identifier to locate you on Internet (similar to a phone number).
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74
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75 Do you agree to do this request ?
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76 """
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77 ).format(
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78 page=GET_IP_PAGE, domain=urllib.parse.urlparse(GET_IP_PAGE).netloc, app_name=C.APP_NAME
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79 )
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80 NS_IP_CHECK = "urn:xmpp:sic:1"
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81
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82 PARAMS = """
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83 <params>
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84 <general>
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85 <category name="{category}">
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86 <param name="{name}" label="{label}" type="bool" />
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87 </category>
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88 </general>
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89 </params>
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90 """.format(
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91 category=GET_IP_CATEGORY, name=GET_IP_NAME, label=GET_IP_LABEL
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92 )
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93
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94
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95 class IPPlugin(object):
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96 # TODO: refresh IP if a new connection is detected
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97 # TODO: manage IPv6 when implemented in SàT
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98
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99 def __init__(self, host):
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100 log.info(_("plugin IP discovery initialization"))
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101 self.host = host
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102 host.memory.updateParams(PARAMS)
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103
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104 # NAT-Port
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105 try:
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106 self._nat = host.plugins["NAT-PORT"]
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107 except KeyError:
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108 log.debug("NAT port plugin not available")
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109 self._nat = None
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110
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111 # XXX: cache is kept until SàT is restarted
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112 # if IP may have changed, use self.refreshIP
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113 self._external_ip_cache = None
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114 self._local_ip_cache = None
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115
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116 def getHandler(self, client):
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117 return IPPlugin_handler()
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118
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119 def refreshIP(self):
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120 # FIXME: use a trigger instead ?
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121 self._external_ip_cache = None
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122 self._local_ip_cache = None
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123
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124 def _externalAllowed(self, client):
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125 """Return value of parameter with autorisation of user to do external requests
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126
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127 if parameter is not set, a dialog is shown to use to get its confirmation, and parameted is set according to answer
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128 @return (defer.Deferred[bool]): True if external request is autorised
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129 """
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130 allow_get_ip = self.host.memory.params.getParamA(
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131 GET_IP_NAME, GET_IP_CATEGORY, use_default=False
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132 )
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133
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134 if allow_get_ip is None:
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135 # we don't have autorisation from user yet to use get_ip, we ask him
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136 def setParam(allowed):
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137 # FIXME: we need to use boolConst as setParam only manage str/unicode
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138 # need to be fixed when params will be refactored
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139 self.host.memory.setParam(
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140 GET_IP_NAME, C.boolConst(allowed), GET_IP_CATEGORY
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141 )
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142 return allowed
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143
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144 d = xml_tools.deferConfirm(
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145 self.host,
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146 _(GET_IP_CONFIRM),
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147 _(GET_IP_CONFIRM_TITLE),
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148 profile=client.profile,
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149 )
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150 d.addCallback(setParam)
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151 return d
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152
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153 return defer.succeed(allow_get_ip)
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154
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155 def _filterAddresse(self, ip_addr):
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156 """Filter acceptable addresses
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157
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158 For now, just remove IPv4 local addresses
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159 @param ip_addr(str): IP addresse
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160 @return (bool): True if addresse is acceptable
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161 """
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162 return not ip_addr.startswith("127.")
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163
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164 def _insertFirst(self, addresses, ip_addr):
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165 """Insert ip_addr as first item in addresses
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166
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167 @param ip_addr(str): IP addresse
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168 @param addresses(list): list of IP addresses
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169 """
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170 if ip_addr in addresses:
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171 if addresses[0] != ip_addr:
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172 addresses.remove(ip_addr)
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173 addresses.insert(0, ip_addr)
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174 else:
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175 addresses.insert(0, ip_addr)
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176
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177 def _getIPFromExternal(self, ext_url):
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178 """Get local IP by doing a connection on an external url
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179
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180 @param ext_utl(str): url to connect to
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181 @return (D(str)): return local IP
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182 """
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183 url = urllib.parse.urlparse(ext_url)
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184 port = url.port
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185 if port is None:
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186 if url.scheme == "http":
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187 port = 80
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188 elif url.scheme == "https":
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189 port = 443
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190 else:
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191 log.error("Unknown url scheme: {}".format(url.scheme))
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192 defer.returnValue(None)
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193 if url.hostname is None:
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194 log.error("Can't find url hostname for {}".format(GET_IP_PAGE))
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195
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196 point = endpoints.TCP4ClientEndpoint(reactor, url.hostname, port)
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197
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198 def gotConnection(p):
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199 local_ip = p.transport.getHost().host
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200 p.transport.loseConnection()
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201 return local_ip
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202
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diff changeset
203 d = endpoints.connectProtocol(point, protocol.Protocol())
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204 d.addCallback(gotConnection)
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205 return d
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206
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diff changeset
207 @defer.inlineCallbacks
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208 def getLocalIPs(self, client):
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209 """Try do discover local area network IPs
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210
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diff changeset
211 @return (deferred): list of lan IP addresses
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diff changeset
212 if there are several addresses, the one used with the server is put first
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213 if no address is found, localhost IP will be in the list
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214 """
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diff changeset
215 # TODO: manage permission requesting (e.g. for UMTS link)
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216 if self._local_ip_cache is not None:
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217 defer.returnValue(self._local_ip_cache)
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218 addresses = []
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219 localhost = ["127.0.0.1"]
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220
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diff changeset
221 # we first try our luck with netifaces
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222 if netifaces is not None:
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223 addresses = []
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diff changeset
224 for interface in netifaces.interfaces():
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225 if_addresses = netifaces.ifaddresses(interface)
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diff changeset
226 try:
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diff changeset
227 inet_list = if_addresses[netifaces.AF_INET]
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diff changeset
228 except KeyError:
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diff changeset
229 continue
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diff changeset
230 for data in inet_list:
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231 addresse = data["addr"]
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diff changeset
232 if self._filterAddresse(addresse):
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233 addresses.append(addresse)
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234
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Goffi <goffi@goffi.org>
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235 # then we use our connection to server
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diff changeset
236 ip = client.xmlstream.transport.getHost().host
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diff changeset
237 if self._filterAddresse(ip):
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238 self._insertFirst(addresses, ip)
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diff changeset
239 defer.returnValue(addresses)
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240
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Goffi <goffi@goffi.org>
parents: 1566
diff changeset
241 # if server is local, we try with NAT-Port
1537
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diff changeset
242 if self._nat is not None:
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diff changeset
243 nat_ip = yield self._nat.getIP(local=True)
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diff changeset
244 if nat_ip is not None:
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245 self._insertFirst(addresses, nat_ip)
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diff changeset
246 defer.returnValue(addresses)
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diff changeset
247
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diff changeset
248 if addresses:
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diff changeset
249 defer.returnValue(addresses)
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diff changeset
250
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diff changeset
251 # still not luck, we need to contact external website
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252 allow_get_ip = yield self._externalAllowed(client)
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253
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diff changeset
254 if not allow_get_ip:
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Goffi <goffi@goffi.org>
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diff changeset
255 defer.returnValue(addresses or localhost)
1537
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diff changeset
256
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diff changeset
257 try:
eb8aae35085b plugin ip: local ip cache + DNS error detection
Goffi <goffi@goffi.org>
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diff changeset
258 ip_tuple = yield self._getIPFromExternal(GET_IP_PAGE)
1566
ec3848916ee8 plugin ip: implemented XEP-0279 for external ip retrieval + fixed bad exception handling
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diff changeset
259 except (internet_error.DNSLookupError, internet_error.TimeoutError):
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260 log.warning("Can't access Domain Name System")
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Goffi <goffi@goffi.org>
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diff changeset
261 defer.returnValue(addresses or localhost)
1537
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262 self._insertFirst(addresses, ip_tuple.local)
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diff changeset
263 defer.returnValue(addresses)
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264
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diff changeset
265 @defer.inlineCallbacks
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266 def getExternalIP(self, client):
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267 """Try to discover external IP
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268
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269 @return (deferred): external IP address or None if it can't be discovered
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270 """
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271 if self._external_ip_cache is not None:
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diff changeset
272 defer.returnValue(self._external_ip_cache)
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273
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274 # we first try with XEP-0279
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275 ip_check = yield self.host.hasFeature(client, NS_IP_CHECK)
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276 if ip_check:
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277 log.debug("Server IP Check available, we use it to retrieve our IP")
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278 iq_elt = client.IQ("get")
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279 iq_elt['to'] = client.host
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280 iq_elt.addElement((NS_IP_CHECK, "address"))
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281 try:
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282 result_elt = yield iq_elt.send()
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283 address_elt = next(result_elt.elements(NS_IP_CHECK, "address"))
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284 ip_elt = next(address_elt.elements(NS_IP_CHECK, "ip"))
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285 except StopIteration:
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286 log.warning(
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287 "Server returned invalid result on XEP-0279 request, we ignore it"
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288 )
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289 except StanzaError as e:
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290 log.warning("error while requesting ip to server: {}".format(e))
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291 else:
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292 # FIXME: server IP may not be the same as external IP (server can be on local machine or network)
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293 # IP should be checked to see if we have a local one, and rejected in this case
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294 external_ip = str(ip_elt)
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295 log.debug("External IP found: {}".format(external_ip))
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296 self._external_ip_cache = external_ip
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297 defer.returnValue(self._external_ip_cache)
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298
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299 # then with NAT-Port
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300 if self._nat is not None:
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301 nat_ip = yield self._nat.getIP()
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302 if nat_ip is not None:
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303 self._external_ip_cache = nat_ip
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304 defer.returnValue(nat_ip)
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305
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306 # and finally by requesting external website
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307 allow_get_ip = yield self._externalAllowed(client)
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308 try:
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309 ip = ((yield webclient.getPage(GET_IP_PAGE.encode('utf-8')))
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310 if allow_get_ip else None)
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311 except (internet_error.DNSLookupError, internet_error.TimeoutError):
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312 log.warning("Can't access Domain Name System")
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313 ip = None
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314 except web_error.Error as e:
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315 log.warning(
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316 "Error while retrieving IP on {url}: {message}".format(
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317 url=GET_IP_PAGE, message=e
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318 )
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319 )
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320 ip = None
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321 else:
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322 self._external_ip_cache = ip
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323 defer.returnValue(ip)
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324
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325
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326 @implementer(iwokkel.IDisco)
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327 class IPPlugin_handler(XMPPHandler):
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328
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329 def getDiscoInfo(self, requestor, target, nodeIdentifier=""):
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330 return [disco.DiscoFeature(NS_IP_CHECK)]
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331
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332 def getDiscoItems(self, requestor, target, nodeIdentifier=""):
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333 return []