annotate libervia/backend/plugins/plugin_misc_ip.py @ 4232:0fbe5c605eb6

tests (unit/webrtc,XEP-0176, XEP-0234): Fix tests and add webrtc file transfer tests: fix 441
author Goffi <goffi@goffi.org>
date Sat, 06 Apr 2024 12:59:50 +0200 (8 months ago)
parents b86912d3fd33
children 0d7bb4df2343
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1 #!/usr/bin/env python3
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2
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3
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4 # SAT plugin for IP address discovery
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5 # Copyright (C) 2009-2021 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 libervia.backend.core.i18n import _, D_
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22 from libervia.backend.core.constants import Const as C
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23 from libervia.backend.core.log import getLogger
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24 from libervia.backend.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.update_params(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.refresh_ip
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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 get_handler(self, client):
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117 return IPPlugin_handler()
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118
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119 def refresh_ip(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 _external_allowed(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.param_get_a(
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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 param_set(allowed):
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137 # FIXME: we need to use bool_const as param_set 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.param_set(
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140 GET_IP_NAME, C.bool_const(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.defer_confirm(
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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(param_set)
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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 _filter_addresse(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 _insert_first(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 addresses(list): list of IP addresses
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168 @param ip_addr(str): IP addresse
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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 async def _get_ip_from_external(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 (str, None): return local IP, or None if it's not possible
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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 return 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 p = await endpoints.connectProtocol(point, protocol.Protocol())
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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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203 async def get_local_ips(self, client):
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204 """Try do discover local area network IPs
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205
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206 @return (deferred): list of lan IP addresses
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207 if there are several addresses, the one used with the server is put first
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208 if no address is found, localhost IP will be in the list
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209 """
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210 # TODO: manage permission requesting (e.g. for UMTS link)
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211 if self._local_ip_cache is not None:
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212 return self._local_ip_cache
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213 addresses = []
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214 localhost = ["127.0.0.1"]
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215
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216 # we first try our luck with netifaces
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217 if netifaces is not None:
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218 addresses = []
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219 for interface in netifaces.interfaces():
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220 if_addresses = netifaces.ifaddresses(interface)
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221 try:
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222 inet_list = if_addresses[netifaces.AF_INET]
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223 except KeyError:
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224 continue
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225 for data in inet_list:
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226 addresse = data["addr"]
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227 if self._filter_addresse(addresse):
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228 addresses.append(addresse)
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229
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230 # then we use our connection to server
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231 ip = client.xmlstream.transport.getHost().host
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232 if self._filter_addresse(ip):
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233 self._insert_first(addresses, ip)
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234 return addresses
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235
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236 # if server is local, we try with NAT-Port
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237 if self._nat is not None:
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238 nat_ip = await self._nat.get_ip(local=True)
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239 if nat_ip is not None:
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240 self._insert_first(addresses, nat_ip)
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241 return addresses
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242
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243 if addresses:
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244 return addresses
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245
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246 # still not luck, we need to contact external website
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247 allow_get_ip = await self._external_allowed(client)
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248
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249 if not allow_get_ip:
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250 return addresses or localhost
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251
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252 try:
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253 local_ip = await defer.ensureDeferred(self._get_ip_from_external(GET_IP_PAGE))
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254 except (internet_error.DNSLookupError, internet_error.TimeoutError):
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255 log.warning("Can't access Domain Name System")
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256 else:
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257 if local_ip is not None:
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258 self._insert_first(addresses, local_ip)
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259
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260 return addresses or localhost
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261
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262 async def get_external_ip(self, client):
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263 """Try to discover external IP
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264
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265 @return (deferred): external IP address or None if it can't be discovered
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266 """
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267 if self._external_ip_cache is not None:
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268 return self._external_ip_cache
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269
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270 # we first try with XEP-0279
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271 ip_check = await self.host.hasFeature(client, NS_IP_CHECK)
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272 if ip_check:
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273 log.debug("Server IP Check available, we use it to retrieve our IP")
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274 iq_elt = client.IQ("get")
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275 iq_elt.addElement((NS_IP_CHECK, "address"))
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276 try:
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277 result_elt = await iq_elt.send()
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278 address_elt = next(result_elt.elements(NS_IP_CHECK, "address"))
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279 ip_elt = next(address_elt.elements(NS_IP_CHECK, "ip"))
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280 except StopIteration:
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281 log.warning(
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282 "Server returned invalid result on XEP-0279 request, we ignore it"
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283 )
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284 except StanzaError as e:
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285 log.warning("error while requesting ip to server: {}".format(e))
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286 else:
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287 # FIXME: server IP may not be the same as external IP (server can be on local machine or network)
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288 # IP should be checked to see if we have a local one, and rejected in this case
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289 external_ip = str(ip_elt)
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290 log.debug("External IP found: {}".format(external_ip))
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291 self._external_ip_cache = external_ip
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292 return self._external_ip_cache
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293
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294 # then with NAT-Port
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295 if self._nat is not None:
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296 nat_ip = await self._nat.get_ip()
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297 if nat_ip is not None:
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298 self._external_ip_cache = nat_ip
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299 return nat_ip
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300
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301 # and finally by requesting external website
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302 allow_get_ip = await self._external_allowed(client)
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303
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304 ip = None
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305
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306 # FIXME: following code is deprecated, check it
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307 # try:
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308 # ip = ((await webclient.getPage(GET_IP_PAGE.encode('utf-8')))
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309 # if allow_get_ip else None)
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310 # except (internet_error.DNSLookupError, internet_error.TimeoutError):
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311 # log.warning("Can't access Domain Name System")
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312 # ip = None
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313 # except web_error.Error as e:
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314 # log.warning(
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315 # "Error while retrieving IP on {url}: {message}".format(
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316 # url=GET_IP_PAGE, message=e
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317 # )
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318 # )
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319 # ip = None
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320 # else:
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321 # self._external_ip_cache = ip
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322 return ip
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323
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324
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325 @implementer(iwokkel.IDisco)
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326 class IPPlugin_handler(XMPPHandler):
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327
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328 def getDiscoInfo(self, requestor, target, nodeIdentifier=""):
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329 return [disco.DiscoFeature(NS_IP_CHECK)]
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330
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331 def getDiscoItems(self, requestor, target, nodeIdentifier=""):
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332 return []