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annotate sat/plugins/plugin_misc_nat_port.py @ 3836:e183f1fbfa8d

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doc (cli/pubsub): add doc for ``reference`` subcommand: rel 369
author Goffi <goffi@goffi.org>
date Sun, 10 Jul 2022 16:15:09 +0200
parents c8d980d694a7
children 524856bd7b19
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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 NAT port mapping
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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 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
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24 log = getLogger(__name__)
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25 from sat.core import exceptions
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26 from twisted.internet import threads
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27 from twisted.internet import defer
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28 from twisted.python import failure
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29 import threading
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30
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31 try:
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32 import miniupnpc
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33 except ImportError:
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34 raise exceptions.MissingModule(
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35 "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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36 )
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38
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39 PLUGIN_INFO = {
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40 C.PI_NAME: "NAT port mapping",
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41 C.PI_IMPORT_NAME: "NAT-PORT",
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42 C.PI_TYPE: C.PLUG_TYPE_MISC,
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43 C.PI_MAIN: "NatPort",
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44 C.PI_HANDLER: "no",
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45 C.PI_DESCRIPTION: _("""Automatic NAT port mapping using UPnP"""),
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46 }
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47
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48 STARTING_PORT = 6000 # starting point to automatically find a port
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49 DEFAULT_DESC = (
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50 "SaT port mapping"
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51 ) # we don't use "à" here as some bugged NAT don't manage charset correctly
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53
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54 class MappingError(Exception):
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55 pass
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56
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57
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58 class NatPort(object):
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59 # TODO: refresh data if a new connection is detected (see plugin_misc_ip)
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60
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61 def __init__(self, host):
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62 log.info(_("plugin NAT Port initialization"))
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63 self.host = host
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64 self._external_ip = None
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65 self._initialised = defer.Deferred()
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66 self._upnp = miniupnpc.UPnP() # will be None if no device is available
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67 self._upnp.discoverdelay = 200
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68 self._mutex = threading.Lock() # used to protect access to self._upnp
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69 self._starting_port_cache = None # used to cache the first available port
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70 self._to_unmap = [] # list of tuples (ext_port, protocol) of ports to unmap on unload
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71 discover_d = threads.deferToThread(self._discover)
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72 discover_d.chainDeferred(self._initialised)
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73 self._initialised.addErrback(self._init_failed)
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74
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75 def unload(self):
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76 if self._to_unmap:
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77 log.info("Cleaning mapped ports")
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78 return threads.deferToThread(self._unmapPortsBlocking)
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79
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80 def _init_failed(self, failure_):
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81 e = failure_.trap(exceptions.NotFound, exceptions.FeatureNotFound)
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82 if e == exceptions.FeatureNotFound:
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83 log.info("UPnP-IGD seems to be not activated on the device")
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84 else:
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85 log.info("UPnP-IGD not available")
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86 self._upnp = None
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87
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88 def _discover(self):
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89 devices = self._upnp.discover()
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90 if devices:
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91 log.info("{nb} UPnP-IGD device(s) found".format(nb=devices))
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92 else:
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93 log.info("Can't find UPnP-IGD device on the local network")
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94 raise failure.Failure(exceptions.NotFound())
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95 self._upnp.selectigd()
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96 try:
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97 self._external_ip = self._upnp.externalipaddress()
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98 except Exception:
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99 raise failure.Failure(exceptions.FeatureNotFound())
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100
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101 def getIP(self, local=False):
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102 """Return IP address found with UPnP-IGD
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103
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104 @param local(bool): True to get external IP address, False to get local network one
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105 @return (None, str): found IP address, or None of something got wrong
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106 """
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107
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108 def getIP(__):
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109 if self._upnp is None:
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110 return None
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111 # lanaddr can be the empty string if not found,
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112 # we need to return None in this case
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113 return (self._upnp.lanaddr or None) if local else self._external_ip
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114
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115 return self._initialised.addCallback(getIP)
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116
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117 def _unmapPortsBlocking(self):
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118 """Unmap ports mapped in this session"""
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119 self._mutex.acquire()
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120 try:
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121 for port, protocol in self._to_unmap:
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122 log.info("Unmapping port {}".format(port))
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123 unmapping = self._upnp.deleteportmapping(
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124 # the last parameter is remoteHost, we don't use it
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125 port,
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126 protocol,
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127 "",
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128 )
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129
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130 if not unmapping:
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131 log.error(
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132 "Can't unmap port {port} ({protocol})".format(
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133 port=port, protocol=protocol
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134 )
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135 )
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136 del self._to_unmap[:]
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137 finally:
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138 self._mutex.release()
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139
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140 def _mapPortBlocking(self, int_port, ext_port, protocol, desc):
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141 """Internal blocking method to map port
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142
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143 @param int_port(int): internal port to use
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144 @param ext_port(int): external port to use, or None to find one automatically
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145 @param protocol(str): 'TCP' or 'UDP'
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146 @param desc(str): description of the mapping
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147 @param return(int, None): external port used in case of success, otherwise None
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148 """
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149 # we use mutex to avoid race condition if 2 threads
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150 # try to acquire a port at the same time
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151 self._mutex.acquire()
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152 try:
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153 if ext_port is None:
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154 # find a free port
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155 starting_port = self._starting_port_cache
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156 ext_port = STARTING_PORT if starting_port is None else starting_port
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157 ret = self._upnp.getspecificportmapping(ext_port, protocol)
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158 while ret != None and ext_port < 65536:
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159 ext_port += 1
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160 ret = self._upnp.getspecificportmapping(ext_port, protocol)
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161 if starting_port is None:
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162 # XXX: we cache the first successfuly found external port
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163 # to avoid testing again the first series the next time
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164 self._starting_port_cache = ext_port
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165
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166 try:
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167 mapping = self._upnp.addportmapping(
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168 # the last parameter is remoteHost, we don't use it
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169 ext_port,
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170 protocol,
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171 self._upnp.lanaddr,
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172 int_port,
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173 desc,
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174 "",
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175 )
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176 except Exception as e:
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177 log.error(_("addportmapping error: {msg}").format(msg=e))
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178 raise failure.Failure(MappingError())
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179
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180 if not mapping:
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181 raise failure.Failure(MappingError())
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182 else:
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183 self._to_unmap.append((ext_port, protocol))
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184 finally:
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185 self._mutex.release()
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186
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187 return ext_port
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188
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189 def mapPort(self, int_port, ext_port=None, protocol="TCP", desc=DEFAULT_DESC):
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190 """Add a port mapping
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191
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192 @param int_port(int): internal port to use
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193 @param ext_port(int,None): external port to use, or None to find one automatically
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194 @param protocol(str): 'TCP' or 'UDP'
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195 @param desc(unicode): description of the mapping
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196 Some UPnP IGD devices have broken encoding. It's probably a good idea to avoid non-ascii chars here
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197 @return (D(int, None)): external port used in case of success, otherwise None
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198 """
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199 if self._upnp is None:
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200 return defer.succeed(None)
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201
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202 def mappingCb(ext_port):
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203 log.info(
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204 "{protocol} mapping from {int_port} to {ext_port} successful".format(
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205 protocol=protocol, int_port=int_port, ext_port=ext_port
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206 )
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207 )
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208 return ext_port
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209
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210 def mappingEb(failure_):
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211 failure_.trap(MappingError)
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212 log.warning("Can't map internal {int_port}".format(int_port=int_port))
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213
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214 def mappingUnknownEb(failure_):
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215 log.error(_("error while trying to map ports: {msg}").format(msg=failure_))
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216
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217 d = threads.deferToThread(
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218 self._mapPortBlocking, int_port, ext_port, protocol, desc
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219 )
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220 d.addCallbacks(mappingCb, mappingEb)
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221 d.addErrback(mappingUnknownEb)
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222 return d