annotate sat/plugins/plugin_misc_ip.py @ 3317:83f25da66bec

core (memory): files are now public by default except for those in root directory: using public permissions by default makes permissions change more easy as we don't have to recursively change all permissions of sub files when changing directory. Root directories are private by default.
author Goffi <goffi@goffi.org>
date Sat, 01 Aug 2020 16:02:41 +0200
parents 559a625a236b
children e898a43b5bea
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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) 2009-2020 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 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 _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 (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
1537
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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 @defer.inlineCallbacks
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204 def getLocalIPs(self, client):
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205 """Try do discover local area network IPs
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206
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207 @return (deferred): list of lan IP addresses
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208 if there are several addresses, the one used with the server is put first
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209 if no address is found, localhost IP will be in the list
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210 """
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211 # TODO: manage permission requesting (e.g. for UMTS link)
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212 if self._local_ip_cache is not None:
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213 defer.returnValue(self._local_ip_cache)
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214 addresses = []
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215 localhost = ["127.0.0.1"]
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216
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217 # we first try our luck with netifaces
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218 if netifaces is not None:
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219 addresses = []
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220 for interface in netifaces.interfaces():
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221 if_addresses = netifaces.ifaddresses(interface)
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222 try:
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223 inet_list = if_addresses[netifaces.AF_INET]
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224 except KeyError:
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225 continue
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226 for data in inet_list:
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227 addresse = data["addr"]
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228 if self._filterAddresse(addresse):
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229 addresses.append(addresse)
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230
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231 # then we use our connection to server
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232 ip = client.xmlstream.transport.getHost().host
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233 if self._filterAddresse(ip):
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234 self._insertFirst(addresses, ip)
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235 defer.returnValue(addresses)
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236
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237 # if server is local, we try with NAT-Port
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238 if self._nat is not None:
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239 nat_ip = yield self._nat.getIP(local=True)
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diff changeset
240 if nat_ip is not None:
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241 self._insertFirst(addresses, nat_ip)
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242 defer.returnValue(addresses)
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243
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diff changeset
244 if addresses:
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245 defer.returnValue(addresses)
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246
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247 # still not luck, we need to contact external website
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248 allow_get_ip = yield self._externalAllowed(client)
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249
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diff changeset
250 if not allow_get_ip:
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251 defer.returnValue(addresses or localhost)
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252
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253 try:
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254 local_ip = yield defer.ensureDeferred(self._getIPFromExternal(GET_IP_PAGE))
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diff changeset
255 except (internet_error.DNSLookupError, internet_error.TimeoutError):
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256 log.warning("Can't access Domain Name System")
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257 else:
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258 if local_ip is not None:
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259 self._insertFirst(addresses, local_ip)
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260
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diff changeset
261 defer.returnValue(addresses or localhost)
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262
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diff changeset
263 @defer.inlineCallbacks
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264 def getExternalIP(self, client):
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265 """Try to discover external IP
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266
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267 @return (deferred): external IP address or None if it can't be discovered
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268 """
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269 if self._external_ip_cache is not None:
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diff changeset
270 defer.returnValue(self._external_ip_cache)
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271
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diff changeset
272 # we first try with XEP-0279
2148
a543eda2c923 core (memory/disco): getInfos now handle node + use client instead of profile in many methods
Goffi <goffi@goffi.org>
parents: 2145
diff changeset
273 ip_check = yield self.host.hasFeature(client, NS_IP_CHECK)
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a9e86f660653 plugin ip: fixed ip check (XEP-0279) use
Goffi <goffi@goffi.org>
parents: 1576
diff changeset
274 if ip_check:
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Goffi <goffi@goffi.org>
parents: 2771
diff changeset
275 log.debug("Server IP Check available, we use it to retrieve our IP")
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Goffi <goffi@goffi.org>
parents: 1555
diff changeset
276 iq_elt = client.IQ("get")
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Goffi <goffi@goffi.org>
parents: 2771
diff changeset
277 iq_elt['to'] = client.host
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Goffi <goffi@goffi.org>
parents: 2562
diff changeset
278 iq_elt.addElement((NS_IP_CHECK, "address"))
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Goffi <goffi@goffi.org>
parents: 1555
diff changeset
279 try:
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Goffi <goffi@goffi.org>
parents: 1576
diff changeset
280 result_elt = yield iq_elt.send()
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Goffi <goffi@goffi.org>
parents: 2771
diff changeset
281 address_elt = next(result_elt.elements(NS_IP_CHECK, "address"))
ab2696e34d29 Python 3 port:
Goffi <goffi@goffi.org>
parents: 2771
diff changeset
282 ip_elt = next(address_elt.elements(NS_IP_CHECK, "ip"))
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Goffi <goffi@goffi.org>
parents: 1555
diff changeset
283 except StopIteration:
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Goffi <goffi@goffi.org>
parents: 2562
diff changeset
284 log.warning(
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Goffi <goffi@goffi.org>
parents: 2771
diff changeset
285 "Server returned invalid result on XEP-0279 request, we ignore it"
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Goffi <goffi@goffi.org>
parents: 2562
diff changeset
286 )
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Goffi <goffi@goffi.org>
parents: 1576
diff changeset
287 except StanzaError as e:
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Goffi <goffi@goffi.org>
parents: 2771
diff changeset
288 log.warning("error while requesting ip to server: {}".format(e))
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Goffi <goffi@goffi.org>
parents: 1555
diff changeset
289 else:
ec3848916ee8 plugin ip: implemented XEP-0279 for external ip retrieval + fixed bad exception handling
Goffi <goffi@goffi.org>
parents: 1555
diff changeset
290 # FIXME: server IP may not be the same as external IP (server can be on local machine or network)
ec3848916ee8 plugin ip: implemented XEP-0279 for external ip retrieval + fixed bad exception handling
Goffi <goffi@goffi.org>
parents: 1555
diff changeset
291 # IP should be checked to see if we have a local one, and rejected in this case
ec3848916ee8 plugin ip: implemented XEP-0279 for external ip retrieval + fixed bad exception handling
Goffi <goffi@goffi.org>
parents: 1555
diff changeset
292 external_ip = str(ip_elt)
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Goffi <goffi@goffi.org>
parents: 2771
diff changeset
293 log.debug("External IP found: {}".format(external_ip))
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Goffi <goffi@goffi.org>
parents: 1555
diff changeset
294 self._external_ip_cache = external_ip
ec3848916ee8 plugin ip: implemented XEP-0279 for external ip retrieval + fixed bad exception handling
Goffi <goffi@goffi.org>
parents: 1555
diff changeset
295 defer.returnValue(self._external_ip_cache)
ec3848916ee8 plugin ip: implemented XEP-0279 for external ip retrieval + fixed bad exception handling
Goffi <goffi@goffi.org>
parents: 1555
diff changeset
296
ec3848916ee8 plugin ip: implemented XEP-0279 for external ip retrieval + fixed bad exception handling
Goffi <goffi@goffi.org>
parents: 1555
diff changeset
297 # then with NAT-Port
1537
6fa9e8c02c34 plugin IP discovery: better IP discovering:
Goffi <goffi@goffi.org>
parents: 1534
diff changeset
298 if self._nat is not None:
6fa9e8c02c34 plugin IP discovery: better IP discovering:
Goffi <goffi@goffi.org>
parents: 1534
diff changeset
299 nat_ip = yield self._nat.getIP()
6fa9e8c02c34 plugin IP discovery: better IP discovering:
Goffi <goffi@goffi.org>
parents: 1534
diff changeset
300 if nat_ip is not None:
1555
eb8aae35085b plugin ip: local ip cache + DNS error detection
Goffi <goffi@goffi.org>
parents: 1537
diff changeset
301 self._external_ip_cache = nat_ip
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Goffi <goffi@goffi.org>
parents: 1534
diff changeset
302 defer.returnValue(nat_ip)
1534
a5e0393a06cd plugin ip, params: plugin IP discovery, first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
303
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Goffi <goffi@goffi.org>
parents: 1555
diff changeset
304 # and finally by requesting external website
2489
e2a7bb875957 plugin pipe/stream, file transfert: refactoring and improvments:
Goffi <goffi@goffi.org>
parents: 2483
diff changeset
305 allow_get_ip = yield self._externalAllowed(client)
1555
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Goffi <goffi@goffi.org>
parents: 1537
diff changeset
306 try:
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Goffi <goffi@goffi.org>
parents: 2771
diff changeset
307 ip = ((yield webclient.getPage(GET_IP_PAGE.encode('utf-8')))
ab2696e34d29 Python 3 port:
Goffi <goffi@goffi.org>
parents: 2771
diff changeset
308 if allow_get_ip else None)
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Goffi <goffi@goffi.org>
parents: 1555
diff changeset
309 except (internet_error.DNSLookupError, internet_error.TimeoutError):
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Goffi <goffi@goffi.org>
parents: 2771
diff changeset
310 log.warning("Can't access Domain Name System")
1555
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Goffi <goffi@goffi.org>
parents: 1537
diff changeset
311 ip = None
1953
f6d560cabeee plugin misc ip: fixed exception when a web error happen while retrieving IP from external website
Goffi <goffi@goffi.org>
parents: 1934
diff changeset
312 except web_error.Error as e:
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Goffi <goffi@goffi.org>
parents: 2562
diff changeset
313 log.warning(
3028
ab2696e34d29 Python 3 port:
Goffi <goffi@goffi.org>
parents: 2771
diff changeset
314 "Error while retrieving IP on {url}: {message}".format(
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Goffi <goffi@goffi.org>
parents: 2562
diff changeset
315 url=GET_IP_PAGE, message=e
56f94936df1e code style reformatting using black
Goffi <goffi@goffi.org>
parents: 2562
diff changeset
316 )
56f94936df1e code style reformatting using black
Goffi <goffi@goffi.org>
parents: 2562
diff changeset
317 )
1953
f6d560cabeee plugin misc ip: fixed exception when a web error happen while retrieving IP from external website
Goffi <goffi@goffi.org>
parents: 1934
diff changeset
318 ip = None
1555
eb8aae35085b plugin ip: local ip cache + DNS error detection
Goffi <goffi@goffi.org>
parents: 1537
diff changeset
319 else:
eb8aae35085b plugin ip: local ip cache + DNS error detection
Goffi <goffi@goffi.org>
parents: 1537
diff changeset
320 self._external_ip_cache = ip
1537
6fa9e8c02c34 plugin IP discovery: better IP discovering:
Goffi <goffi@goffi.org>
parents: 1534
diff changeset
321 defer.returnValue(ip)
1566
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Goffi <goffi@goffi.org>
parents: 1555
diff changeset
322
ec3848916ee8 plugin ip: implemented XEP-0279 for external ip retrieval + fixed bad exception handling
Goffi <goffi@goffi.org>
parents: 1555
diff changeset
323
3028
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Goffi <goffi@goffi.org>
parents: 2771
diff changeset
324 @implementer(iwokkel.IDisco)
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Goffi <goffi@goffi.org>
parents: 1555
diff changeset
325 class IPPlugin_handler(XMPPHandler):
ec3848916ee8 plugin ip: implemented XEP-0279 for external ip retrieval + fixed bad exception handling
Goffi <goffi@goffi.org>
parents: 1555
diff changeset
326
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Goffi <goffi@goffi.org>
parents: 2562
diff changeset
327 def getDiscoInfo(self, requestor, target, nodeIdentifier=""):
1566
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Goffi <goffi@goffi.org>
parents: 1555
diff changeset
328 return [disco.DiscoFeature(NS_IP_CHECK)]
ec3848916ee8 plugin ip: implemented XEP-0279 for external ip retrieval + fixed bad exception handling
Goffi <goffi@goffi.org>
parents: 1555
diff changeset
329
2624
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Goffi <goffi@goffi.org>
parents: 2562
diff changeset
330 def getDiscoItems(self, requestor, target, nodeIdentifier=""):
1566
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Goffi <goffi@goffi.org>
parents: 1555
diff changeset
331 return []