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annotate sat/plugins/plugin_misc_nat-port.py @ 2590:bd9d92bc0d6c

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quick frontends (app): retrieve namespaces on startup
author Goffi <goffi@goffi.org>
date Tue, 22 May 2018 10:07:33 +0200
parents 26edcf3a30eb
children 56f94936df1e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1934
2daf7b4c6756 use of /usr/bin/env instead of /usr/bin/python in shebang
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1 #!/usr/bin/env python2
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2 # -*- coding: utf-8 -*-
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3
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4 # SAT plugin for NAT port mapping
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5 # Copyright (C) 2009-2018 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 from sat.core.i18n import _
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21 from sat.core.constants import Const as C
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22 from sat.core.log import getLogger
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23 log = getLogger(__name__)
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24 from sat.core import exceptions
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25 from twisted.internet import threads
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26 from twisted.internet import defer
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27 from twisted.python import failure
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28 import threading
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29
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30 try:
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31 import miniupnpc
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32 except ImportError:
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33 raise exceptions.MissingModule(u"Missing module MiniUPnPc, please download/install it (and its Python binding) at http://miniupnp.free.fr/ (or use pip install miniupnpc)")
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35
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36 PLUGIN_INFO = {
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37 C.PI_NAME: "NAT port mapping",
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38 C.PI_IMPORT_NAME: "NAT-PORT",
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39 C.PI_TYPE: C.PLUG_TYPE_MISC,
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40 C.PI_MAIN: "NatPort",
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41 C.PI_HANDLER: "no",
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42 C.PI_DESCRIPTION: _("""Automatic NAT port mapping using UPnP"""),
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43 }
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44
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45 STARTING_PORT = 6000 # starting point to automatically find a port
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46 DEFAULT_DESC = u'SaT port mapping' # we don't use "à" here as some bugged NAT don't manage charset correctly
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47
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48
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49 class MappingError(Exception):
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50 pass
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51
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52
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53 class NatPort(object):
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54 # TODO: refresh data if a new connection is detected (see plugin_misc_ip)
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55
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56 def __init__(self, host):
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57 log.info(_("plugin NAT Port initialization"))
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58 self.host = host
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59 self._external_ip = None
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60 self._initialised = defer.Deferred()
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61 self._upnp = miniupnpc.UPnP() # will be None if no device is available
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62 self._upnp.discoverdelay=200
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63 self._mutex = threading.Lock() # used to protect access to self._upnp
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64 self._starting_port_cache = None # used to cache the first available port
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65 self._to_unmap = [] # list of tuples (ext_port, protocol) of ports to unmap on unload
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66 discover_d = threads.deferToThread(self._discover)
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67 discover_d.chainDeferred(self._initialised)
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68 self._initialised.addErrback(self._init_failed)
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69
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70 def unload(self):
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71 if self._to_unmap:
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72 log.info(u"Cleaning mapped ports")
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73 return threads.deferToThread(self._unmapPortsBlocking)
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74
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75 def _init_failed(self, failure_):
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76 e = failure_.trap(exceptions.NotFound, exceptions.FeatureNotFound)
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77 if e == exceptions.FeatureNotFound:
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78 log.info(u"UPnP-IGD seems to be not activated on the device")
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79 else:
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80 log.info(u"UPnP-IGD not available")
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81 self._upnp = None
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82
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83 def _discover(self):
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84 devices = self._upnp.discover()
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85 if devices:
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86 log.info(u"{nb} UPnP-IGD device(s) found".format(nb=devices))
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87 else:
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88 log.info(u"Can't find UPnP-IGD device on the local network")
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89 raise failure.Failure(exceptions.NotFound())
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90 self._upnp.selectigd()
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91 try:
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92 self._external_ip = self._upnp.externalipaddress()
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93 except Exception:
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94 raise failure.Failure(exceptions.FeatureNotFound())
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95
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96 def getIP(self, local=False):
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97 """Return IP address found with UPnP-IGD
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98
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99 @param local(bool): True to get external IP address, False to get local network one
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100 @return (None, str): found IP address, or None of something got wrong
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101 """
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102 def getIP(dummy):
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103 if self._upnp is None:
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104 return None
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105 # lanaddr can be the empty string if not found,
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106 # we need to return None in this case
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107 return (self._upnp.lanaddr or None) if local else self._external_ip
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108 return self._initialised.addCallback(getIP)
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109
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110 def _unmapPortsBlocking(self):
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111 """Unmap ports mapped in this session"""
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112 self._mutex.acquire()
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113 try:
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114 for port, protocol in self._to_unmap:
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115 log.info(u"Unmapping port {}".format(port))
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116 unmapping = self._upnp.deleteportmapping(
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117 # the last parameter is remoteHost, we don't use it
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118 port, protocol, '')
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119
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120 if not unmapping:
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121 log.error(u"Can't unmap port {port} ({protocol})".format(
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122 port=port, protocol=protocol))
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123 del self._to_unmap[:]
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124 finally:
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125 self._mutex.release()
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126
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127 def _mapPortBlocking(self, int_port, ext_port, protocol, desc):
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128 """Internal blocking method to map port
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129
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130 @param int_port(int): internal port to use
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131 @param ext_port(int): external port to use, or None to find one automatically
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132 @param protocol(str): 'TCP' or 'UDP'
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133 @param desc(str): description of the mapping
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134 @param return(int, None): external port used in case of success, otherwise None
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135 """
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136 # we use mutex to avoid race condition if 2 threads
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137 # try to acquire a port at the same time
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138 self._mutex.acquire()
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139 try:
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140 if ext_port is None:
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141 # find a free port
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142 starting_port = self._starting_port_cache
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143 ext_port = STARTING_PORT if starting_port is None else starting_port
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144 ret = self._upnp.getspecificportmapping(ext_port, protocol)
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145 while ret != None and ext_port < 65536:
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146 ext_port += 1
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147 ret = self._upnp.getspecificportmapping(ext_port, protocol)
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148 if starting_port is None:
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149 # XXX: we cache the first successfuly found external port
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150 # to avoid testing again the first series the next time
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151 self._starting_port_cache = ext_port
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152
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153 try:
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154 mapping = self._upnp.addportmapping(
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155 # the last parameter is remoteHost, we don't use it
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156 ext_port, protocol, self._upnp.lanaddr, int_port, desc, '')
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157 except Exception as e:
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158 log.error(_(u"addportmapping error: {msg}").format(msg=e))
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159 raise failure.Failure(MappingError())
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160
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161 if not mapping:
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162 raise failure.Failure(MappingError())
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163 else:
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164 self._to_unmap.append((ext_port, protocol))
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165 finally:
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166 self._mutex.release()
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167
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168 return ext_port
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169
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170 def mapPort(self, int_port, ext_port=None, protocol='TCP', desc=DEFAULT_DESC):
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171 """Add a port mapping
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172
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173 @param int_port(int): internal port to use
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174 @param ext_port(int,None): external port to use, or None to find one automatically
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175 @param protocol(str): 'TCP' or 'UDP'
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176 @param desc(unicode): description of the mapping
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177 Some UPnP IGD devices have broken encoding. It's probably a good idea to avoid non-ascii chars here
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178 @return (D(int, None)): external port used in case of success, otherwise None
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179 """
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180 if self._upnp is None:
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181 return defer.succeed(None)
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182 def mappingCb(ext_port):
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183 log.info(u"{protocol} mapping from {int_port} to {ext_port} successful".format(
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184 protocol = protocol,
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185 int_port = int_port,
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186 ext_port = ext_port,
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187 ))
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188 return ext_port
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189 def mappingEb(failure_):
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190 failure_.trap(MappingError)
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191 log.warning(u"Can't map internal {int_port}".format(int_port=int_port))
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192 def mappingUnknownEb(failure_):
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193 log.error(_(u"error while trying to map ports: {msg}").format(msg=failure_))
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194 d = threads.deferToThread(self._mapPortBlocking, int_port, ext_port, protocol, desc)
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195 d.addCallbacks(mappingCb, mappingEb)
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196 d.addErrback(mappingUnknownEb)
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197 return d