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Start the socks5 backend

GSoC/Meterpreter_Web_Console
Spencer McIntyre 2018-03-21 21:14:11 -04:00
parent 835281c7cc
commit 6fa0831bcb
1 changed files with 178 additions and 350 deletions
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494
lib/rex/proto/proxy/socks5.rb
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@ -1,12 +1,9 @@
# -*- coding: binary -*- # -*- coding: binary -*-
# #
# sf - Sept 2010 # sf - Sept 2010 (original socks4a code)
# surefire - May 2018 # zeroSteiner - March 2018 (socks 5 update)
#
# TODO: Add support for required SOCKS username+password authentication require 'bindata'
# TODO: Support multiple connection requests within a single session
#
require 'thread' require 'thread'
require 'rex/logging' require 'rex/logging'
require 'rex/socket' require 'rex/socket'
@ -25,283 +22,124 @@ class Socks5
# #
class Client class Client
# COMMON HEADER FIELDS REQUEST_VERSION = 5
REPLY_VERSION = 0
RESERVED = 0 COMMAND_CONNECT = 1
COMMAND_BIND = 2
# ADDRESS TYPES COMMAND_UDP_ASSOCIATE = 3
ADDRESS_TYPE_IPV4 = 1 ADDRESS_TYPE_IPV4 = 1
ADDRESS_TYPE_DOMAINNAME = 3 ADDRESS_TYPE_DOMAINNAME = 3
ADDRESS_TYPE_IPV6 = 4 ADDRESS_TYPE_IPV6 = 4
# AUTHENTICATION TYPES REQUEST_GRANTED = 90
AUTH_PROTOCOL_VERSION = 0x01 REQUEST_REJECT_FAILED = 91
REQUEST_REJECT_CONNECT = 92
AUTH_METHOD_TYPE_NONE = 0x00 REQUEST_REJECT_USERID = 93
AUTH_METHOD_TYPE_USER_PASS = 0x02
AUTH_METHODS_REJECTED = 0xFF
AUTH_SUCCESS = 0x00
AUTH_FAILURE = 0x01
# REQUEST HEADER FIELDS
REQUEST_VERSION = 5
REQUEST_AUTH_METHOD_COUNT = 1
REQUEST_COMMAND_CONNECT = 1
REQUEST_COMMAND_BIND = 2
REQUEST_COMMAND_UDP_ASSOCIATE = 3 # TODO: support UDP associate
# RESPONSE HEADER FIELDS
REPLY_VERSION = 5
REPLY_FIELD_SUCCEEDED = 0
REPLY_FIELD_SOCKS_SERVER_FAILURE = 1
REPLY_FIELD_NOT_ALLOWED_BY_RULESET = 2
REPLY_FIELD_NETWORK_UNREACHABLE = 3
REPLY_FIELD_HOST_UNREACHABLE = 4
REPLY_FIELD_CONNECTION_REFUSED = 5
REPLY_FIELD_TTL_EXPIRED = 6
REPLY_FIELD_COMMAND_NOT_SUPPORTED = 7
REPLY_FIELD_ADDRESS_TYPE_NOT_SUPPORTED = 8
# RPEER INDEXES
HOST = 1 HOST = 1
PORT = 2 PORT = 2
class Response #
# A Socks5 packet.
#
class Packet
def initialize( sock ) def initialize
@version = REQUEST_VERSION @version = REQUEST_VERSION
@command = nil @command = 0
@reserved = RESERVED
@atyp = nil
@dest_port = 0 @dest_port = 0
@dest_ip = '0.0.0.0' @dest_ip = '0.0.0.0'
@sock = sock @userid = ''
end end
# convert IPv6 hex-encoded, colon-delimited string (0000:1111:...) into a 128-bit address #
def ipv6_atoi(ip) # A helper function to recv in a Socks5 packet byte by byte.
raw = "" #
ip.scan(/....:/).each do |quad| # sf: we could just call raw = sock.get_once but some clients
raw += quad[0,2].hex.chr # seem to need reading this byte by byte instead.
raw += quad[2,4].hex.chr #
end def Packet.recv( sock, timeout=30 )
return raw
end
# Pack a packet into raw bytes for transmitting on the wire.
def to_r
begin
if @atyp == ADDRESS_TYPE_DOMAINNAME
if @dest_ip.include? '.' # stupid check for IPv4 addresses
@atyp = ADDRESS_TYPE_IPV4
elsif @dest_ip.include? ':' # stupid check for IPv4 addresses
@atyp = ADDRESS_TYPE_IPV6
else
raise "Malformed dest_ip while sending SOCKS5 response packet"
end
end
if @atyp == ADDRESS_TYPE_IPV4
raw = [ @version, @command, @reserved, @atyp, Rex::Socket.addr_atoi(@dest_ip), @dest_port ].pack( 'CCCCNn' )
elsif @atyp == ADDRESS_TYPE_IPV6
raw = [ @version, @command, @reserved, @atyp ].pack ( 'CCCC')
raw += ipv6_atoi(@dest_ip)
raw += [ @dest_port ].pack( 'n' )
else
raise "Invalid address type field encountered while sending SOCKS5 response packet"
end
return raw
rescue TypeError
raise "Invalid field conversion while sending SOCKS5 response packet"
end
end
def send
@sock.put(self.to_r)
end
attr_writer :version, :command, :dest_port, :dest_ip, :hostname, :atyp
end
class Request
def initialize( sock )
@version = REQUEST_VERSION
@command = nil
@atyp = nil
@dest_port = nil
@dest_ip = nil
@sock = sock
@username = nil
@password = nil
@serverAuthMethods = [ 0x00 ]
end
def requireAuthentication( username, password )
@username = username
@password = password
@serverAuthMethods = [ AUTH_METHOD_TYPE_USER_PASS ]
end
# The first packet sent by the client is a session request
# +----+----------+----------+
# |VER | NMETHODS | METHODS |
# +----+----------+----------+
# | 1 | 1 | 1 to 255 | METHOD (\x00) = NO AUTHENTICATION REQUIRED
# +----+----------+----------+
def parseIncomingSession()
raw = '' raw = ''
# read in the 4 byte header
version = @sock.read( 1 ) while raw.length < 4
raise "Invalid Socks5 request packet received." if not raw << sock.read(1)
( version.unpack( 'C' ).first == REQUEST_VERSION ) end
# if its a request there will be more data
nMethods = @sock.read( 1 ).unpack( 'C' ).first if raw[0..0].unpack('C').first == REQUEST_VERSION
# read in the userid
unpackFormatStr = 'C' + nMethods.to_s # IS THIS REALLY WHAT I'M DOING?! while raw[8..raw.length].index( "\x00" ) == nil
clientAuthMethods = @sock.read( nMethods ).unpack( unpackFormatStr ) raw << sock.read( 1 )
authMethods = ( clientAuthMethods & @serverAuthMethods ) end
# if a hostname is going to be present, read it in
if ( authMethods.empty? ) ip = raw[4..7].unpack( 'N' ).first
raw = [ REQUEST_VERSION, AUTH_METHODS_REJECTED ].pack ( 'CC' ) if( ( ip & 0xFFFFFF00 ) == 0x00000000 and ( ip & 0x000000FF ) != 0x00 )
@sock.put( raw ) hostname = ''
raise "No matching authentication methods agreed upon in session request" while( hostname.index( "\x00" ) == nil )
else hostname += sock.read( 1 )
raw = [REQUEST_VERSION, authMethods[0]].pack ( 'CC' ) end
@sock.put( raw ) raw << hostname
parseIncomingCredentials() if authMethods[0] == AUTH_METHOD_TYPE_USER_PASS
end end
end end
# create a packet from this raw data...
def parseIncomingCredentials() packet = Packet.new
# Based on RFC1929: https://tools.ietf.org/html/rfc1929 packet.from_r( raw ) ? packet : nil
# +----+------+----------+------+----------+
# |VER | ULEN | UNAME | PLEN | PASSWD |
# +----+------+----------+------+----------+
# | 1 | 1 | 1 to 255 | 1 | 1 to 255 | VERSION: 0x01
# +----+------+----------+------+----------+
version = @sock.read( 1 )
raise "Invalid SOCKS5 authentication packet received." if not
( version.unpack( 'C' ).first == 0x01 )
usernameLength = @sock.read( 1 ).unpack( 'C' ).first
username = @sock.read( usernameLength )
passwordLength = @sock.read( 1 ).unpack( 'C' ).first
password = @sock.read( passwordLength )
# +----+--------+
# |VER | STATUS |
# +----+--------+ VERSION: 0x01
# | 1 | 1 | STATUS: 0x00=SUCCESS, otherwise FAILURE
# +----+--------+
if (username == @username && password == @password)
raw = [ AUTH_PROTOCOL_VERSION, AUTH_SUCCESS ].pack ( 'CC' )
ilog("SOCKS5: Successfully authenticated")
@sock.put( raw )
return true
else
raw = [ AUTH_PROTOCOL_VERSION, AUTH_FAILURE ].pack ( 'CC' )
@sock.put( raw )
raise "Invalid SOCKS5 credentials provided"
end end
#
# Pack a packet into raw bytes for transmitting on the wire.
#
def to_r
raw = [ @version, @command, @dest_port, Rex::Socket.addr_atoi( @dest_ip ) ].pack( 'CCnN' )
return raw if( @userid.empty? )
return raw + [ @userid ].pack( 'Z*' )
end end
def parseIncomingConnectionRequest() #
raw = @sock.read ( 262 ) # MAX LENGTH OF REQUEST WITH 256 BYTE HOSTNAME # Unpack a raw packet into its components.
#
# fail if the incoming request is less than 8 bytes (malformed) def from_r( raw )
raise "Client closed connection while expecting SOCKS connection request" if( raw == nil ) return false if( raw.length < 8 )
raise "Client sent malformed packet expecting SOCKS connection request" if( raw.length < 8 )
# Per RFC1928, the lengths of the SOCKS5 request header are:
# +----+-----+-------+------+----------+----------+
# |VER | CMD | RSV | ATYP | DST.ADDR | DST.PORT |
# +----+-----+-------+------+----------+----------+
# | 1 | 1 | X'00' | 1 | Variable | 2 |
# +----+-----+-------+------+----------+----------+
@version = raw[0..0].unpack( 'C' ).first @version = raw[0..0].unpack( 'C' ).first
# fail if the incoming request is an unsupported version (not '0x05') return false if( @version != REQUEST_VERSION and @version != REPLY_VERSION )
raise "Invalid SOCKS version received from client" if( @version != REQUEST_VERSION )
@command = raw[1..1].unpack( 'C' ).first @command = raw[1..1].unpack( 'C' ).first
# fail if the incoming request is an unsupported command (currently only CONNECT) @dest_port = raw[2..3].unpack( 'n' ).first
raise "Invalid SOCKS proxy command received from client" if ( @command != REQUEST_COMMAND_CONNECT ) @dest_ip = Rex::Socket.addr_itoa( raw[4..7].unpack( 'N' ).first )
if( raw.length > 8 )
# "address type of following address" @userid = raw[8..raw.length].unpack( 'Z*' ).first
@atyp = raw[3..3].unpack( 'C' ).first # if this is a socks4a request we can resolve the provided hostname
if( self.is_hostname? )
if (@atyp == ADDRESS_TYPE_IPV4) hostname = raw[(8+@userid.length+1)..raw.length].unpack( 'Z*' ).first
# "the address is a version-4 IP address, with a length of 4 octets" @dest_ip = self.resolve( hostname )
addressLen = 4
addressEnd = 3 + addressLen
hostname = nil
@dest_ip = Rex::Socket.addr_itoa( raw[4..7].unpack('N').first )
elsif (@atyp == ADDRESS_TYPE_IPV6)
# "the address is a version-6 IP address, with a length of 16 octets"
addressLen = 16
addressEnd = 3 + addressLen
hostname = nil
@dest_ip = raw[4..19].unpack( 'H4H4H4H4H4H4H4H4' ).join(':') # Workaround because Rex::Socket.addr_itoa hurts too much
elsif (@atyp == ADDRESS_TYPE_DOMAINNAME)
# "the address field contains a fully-qualified domain name. The first
# octet of the address field contains the number of octets of name that
# follow, there is no terminating NUL octet."
addressLen = raw[4..4].unpack( 'C' ).first
addressStart = 5
addressEnd = 4+addressLen
@hostname = raw[addressStart..addressEnd]
@dest_ip = self.resolve( @hostname )
ilog("SOCKS5: Resolved '#{@hostname}' to #{@dest_ip.to_s}")
# fail if we couldnt resolve the hostname # fail if we couldnt resolve the hostname
if( not @dest_ip ) return false if( not @dest_ip )
wlog("SOCKS5: Failed to resolve '#{@hostname}'...")
end end
else else
raise 'Invalid address type requested in connection request' @userid = ''
end end
@dest_port = raw[addressEnd+1 .. addressEnd+3].unpack('n').first
return true return true
end end
def is_connect?
@command == REQUEST_COMMAND_CONNECT ? true : false
end
def is_bind? def is_bind?
@command == REQUEST_COMMAND_BIND ? true : false @command == COMMAND_BIND ? true : false
end end
attr_reader :version, :command, :dest_port, :dest_ip, :hostname, :atyp def is_connect?
@command == COMMAND_CONNECT ? true : false
end
def is_udp_associate?
@command == COMMAND_UDP_ASSOCIATE ? true : false
end
attr_accessor :version, :command, :dest_port, :dest_ip, :userid
protected protected
#
# Resolve the given hostname into a dotted IP address. # Resolve the given hostname into a dotted IP address.
#
def resolve( hostname ) def resolve( hostname )
if( not hostname.empty? ) if( not hostname.empty? )
begin begin
@ -312,9 +150,42 @@ class Socks5
end end
return nil return nil
end end
#
# As per the Socks4a spec, check to see if the provided dest_ip is 0.0.0.XX
# which indicates after the @userid field contains a hostname to resolve.
#
def is_hostname?
ip = Rex::Socket.addr_atoi( @dest_ip )
if( ip & 0xFFFFFF00 == 0x00000000 )
return true if( ip & 0x000000FF != 0x00 )
end
return false
end end
end
class AuthPacket < BinData::Record
endian :little
uint8 :version
uint8 :supported_methods_length
array :supported_methods, :type => :uint8, :initial_length => :supported_methods_length
end
class RequestPacket < BinData::Record
endian :little
uint8 :version
uint8 :command
uint8 :reserved
uint8 :address_type
array :address, :type => :uint8, :initial_length => lambda { { ADDRESS_TYPE_IPV4 => 4, ADDRESS_TYPE_IPV6 => 8 }.fetch(address_type, 0) }
uint16 :port
end
#
# A mixin for a socket to perform a relay to another socket. # A mixin for a socket to perform a relay to another socket.
#
module Relay module Relay
# #
@ -324,7 +195,7 @@ class Socks5
@relay_client = relay_client @relay_client = relay_client
@relay_sock = relay_sock @relay_sock = relay_sock
# start the relay thread (modified from Rex::IO::StreamAbstraction) # start the relay thread (modified from Rex::IO::StreamAbstraction)
@relay_thread = Rex::ThreadFactory.spawn("SOCKS5ProxyServerRelay", false) do @relay_thread = Rex::ThreadFactory.spawn("SOCKS4AProxyServerRelay", false) do
loop do loop do
closed = false closed = false
buf = nil buf = nil
@ -372,12 +243,13 @@ class Socks5
end end
end end
end end
#
# Create a new client connected to the server. # Create a new client connected to the server.
def initialize( server, sock, opts ) #
@username = opts['USERNAME'] def initialize( server, sock )
@password = opts['PASSWORD']
@server = server @server = server
@lsock = sock @lsock = sock
@rsock = nil @rsock = nil
@ -385,29 +257,24 @@ class Socks5
@mutex = ::Mutex.new @mutex = ::Mutex.new
end end
#
# Start handling the client connection. # Start handling the client connection.
#
def start def start
# create a thread to handle this client request so as to not block the socks5 server # create a thread to handle this client request so as to not block the socks4a server
@client_thread = Rex::ThreadFactory.spawn("SOCKS5ProxyClient", false) do @client_thread = Rex::ThreadFactory.spawn("SOCKS5ProxyClient", false) do
begin begin
@server.add_client( self ) @server.add_client( self )
# get the initial client request packet # get the initial client request packet
request = Request.new ( @lsock ) @lsock.get_once
if not (@username.nil? or @password.nil?) @lsock.put("\x05\x00")
request.requireAuthentication( @username, @password )
end
# negotiate authentication
request.parseIncomingSession()
# negotiate authentication
request.parseIncomingConnectionRequest()
request = Packet.recv(@lsock)
raise "Invalid Socks5 request packet received." if not request
# handle the request # handle the request
begin begin
# handle CONNECT requests # handle socks4a conenct requests
if( request.is_connect? ) if request.is_connect?
# perform the connection request # perform the connection request
params = { params = {
'PeerHost' => request.dest_ip, 'PeerHost' => request.dest_ip,
@ -417,17 +284,12 @@ class Socks5
@rsock = Rex::Socket::Tcp.create( params ) @rsock = Rex::Socket::Tcp.create( params )
# and send back success to the client # and send back success to the client
response = Response.new ( @lsock ) response = Packet.new
response.version = REPLY_VERSION response.version = REPLY_VERSION
response.command = REPLY_FIELD_SUCCEEDED response.command = REQUEST_GRANTED
response.atyp = request.atyp @lsock.put(response.to_r)
response.hostname = request.hostname # handle socks4a bind requests
response.dest_port = request.dest_port elsif request.is_bind?
response.dest_ip = request.dest_ip
ilog("SOCKS5: request accepted to " + request.dest_ip.to_s + request.dest_port.to_s)
response.send()
# handle BIND requests
elsif( request.is_bind? ) # TODO: Test the BIND code with SOCKS5 (this is the old SOCKS4 code)
# create a server socket for this request # create a server socket for this request
params = { params = {
'LocalHost' => '0.0.0.0', 'LocalHost' => '0.0.0.0',
@ -436,18 +298,15 @@ class Socks5
params['Context'] = @server.opts['Context'] if @server.opts.has_key?('Context') params['Context'] = @server.opts['Context'] if @server.opts.has_key?('Context')
bsock = Rex::Socket::TcpServer.create( params ) bsock = Rex::Socket::TcpServer.create( params )
# send back the bind success to the client # send back the bind success to the client
response = Response.new ( @lsock ) response = Packet.new
response.version = REPLY_VERSION response.version = REPLY_VERSION
response.command = REPLY_FIELD_SUCCEEDED response.command = REQUEST_GRANTED
response.atyp = request.atyp
response.hostname = request.hostname
response.dest_ip = '0.0.0.0' response.dest_ip = '0.0.0.0'
response.dest_port = bsock.getlocalname()[PORT] response.dest_port = bsock.getlocalname()[PORT]
response.send() @lsock.put( response.to_r )
ilog("SOCKS5: BIND request accepted to " + request.dest_ip.to_s + request.dest_port.to_s)
# accept a client connection (2 minute timeout as per spec) # accept a client connection (2 minute timeout as per spec)
begin begin
::Timeout.timeout( 120 ) do ::Timeout.timeout(120) do
@rsock = bsock.accept @rsock = bsock.accept
end end
rescue ::Timeout::Error rescue ::Timeout::Error
@ -459,59 +318,27 @@ class Socks5
rpeer = @rsock.getpeername_as_array rpeer = @rsock.getpeername_as_array
raise "Got connection from an invalid peer." if( rpeer[HOST] != request.dest_ip ) raise "Got connection from an invalid peer." if( rpeer[HOST] != request.dest_ip )
# send back the client connect success to the client # send back the client connect success to the client
#
# sf: according to the spec we send this response back to the client, however # sf: according to the spec we send this response back to the client, however
# I have seen some clients who bawk if they get this second response. # I have seen some clients who bawk if they get this second response.
response = Response.new ( @lsock ) #
response = Packet.new
response.version = REPLY_VERSION response.version = REPLY_VERSION
response.command = REPLY_FIELD_SUCCEEDED response.command = REQUEST_GRANTED
response.atyp = request.atyp
response.hostname = request.hostname
response.dest_ip = rpeer[HOST] response.dest_ip = rpeer[HOST]
response.dest_port = rpeer[PORT] response.dest_port = rpeer[PORT]
response.send() @lsock.put( response.to_r )
else else
raise "Unknown request command received #{request.command} received." raise "Unknown request command received #{request.command} received."
end end
rescue Rex::ConnectionRefused, Rex::HostUnreachable, Rex::InvalidDestination, Rex::ConnectionTimeout => e rescue
# send back failure to the client # send back failure to the client
response = Response.new ( @lsock ) response = Packet.new
response.version = REPLY_VERSION response.version = REPLY_VERSION
response.atyp = request.atyp response.command = REQUEST_REJECT_FAILED
response.dest_port = request.dest_port @lsock.put( response.to_r )
response.dest_ip = request.dest_ip
if e.class == Rex::ConnectionRefused
response.command = REPLY_FIELD_CONNECTION_REFUSED
response.send()
raise "Connection refused by destination (#{request.dest_ip}:#{request.dest_port})"
elsif e.class == Rex::ConnectionTimeout
response.command = REPLY_FIELD_HOST_UNREACHABLE
response.send()
raise "Connection attempt timed out (#{request.dest_ip}:#{request.dest_port})"
elsif e.class == Rex::HostUnreachable
response.command = REPLY_FIELD_HOST_UNREACHABLE
response.send()
raise "Host Unreachable (#{request.dest_ip}:#{request.dest_port})"
elsif e.class == Rex::NetworkUnreachable
response.command = REPLY_FIELD_NETWORK_UNREACHABLE
response.send()
raise "Network unreachable (#{request.dest_ip}:#{request.dest_port})"
end
rescue RuntimeError
raise
# TODO: This happens when we get a connection refused for an IPv6 connection. :-(
# It's unknown if that's the only error case.
rescue => e
raise
response = Response.new ( @lsock )
response.version = REPLY_VERSION
response.atyp = request.atyp
response.dest_port = request.dest_port
response.dest_ip = request.dest_ip
response.hostname = request.hostname
response.command = REPLY_FIELD_SOCKS_SERVER_FAILURE
response.send()
# raise an exception to close this client connection # raise an exception to close this client connection
raise e raise "Failed to handle the clients request."
end end
# setup the two way relay for full duplex io # setup the two way relay for full duplex io
@lsock.extend( Relay ) @lsock.extend( Relay )
@ -520,15 +347,15 @@ class Socks5
@lsock.relay( self, @rsock ) @lsock.relay( self, @rsock )
@rsock.relay( self, @lsock ) @rsock.relay( self, @lsock )
rescue rescue
#raise # UNCOMMENT FOR DEBUGGING wlog( "Client.start - #{$!}" )
wlog( "SOCKS5: #{$!}" )
wlog( "SOCKS5: #{$!.message}" )
self.stop self.stop
end end
end end
end end
#
# Stop handling the client connection. # Stop handling the client connection.
#
def stop def stop
@mutex.synchronize do @mutex.synchronize do
if( not @closed ) if( not @closed )
@ -554,11 +381,12 @@ class Socks5
end end
# Create a new Socks5 server. #
# Create a new Socks4a server.
#
def initialize( opts={} ) def initialize( opts={} )
@opts = { 'SRVHOST' => '0.0.0.0', 'SRVPORT' => 1080, @opts = { 'ServerHost' => '0.0.0.0', 'ServerPort' => 1080 }
'USERNAME' => nil, 'PASSWORD' => nil } @opts = @opts.merge( opts )
@opts = @opts.merge( opts['Context']['MsfExploit'].datastore )
@server = nil @server = nil
@clients = ::Array.new @clients = ::Array.new
@running = false @running = false
@ -573,12 +401,12 @@ class Socks5
end end
# #
# Start the Socks5 server. # Start the Socks4a server.
# #
def start def start
begin begin
# create the servers main socket (ignore the context here because we don't want a remote bind) # create the servers main socket (ignore the context here because we don't want a remote bind)
@server = Rex::Socket::TcpServer.create( 'LocalHost' => @opts['SRVHOST'], 'LocalPort' => @opts['SRVPORT'] ) @server = Rex::Socket::TcpServer.create( 'LocalHost' => @opts['ServerHost'], 'LocalPort' => @opts['ServerPort'] )
# signal we are now running # signal we are now running
@running = true @running = true
# start the servers main thread to pick up new clients # start the servers main thread to pick up new clients
@ -588,7 +416,7 @@ class Socks5
# accept the client connection # accept the client connection
sock = @server.accept sock = @server.accept
# and fire off a new client instance to handle it # and fire off a new client instance to handle it
Client.new( self, sock, @opts ).start Client.new( self, sock ).start
rescue rescue
wlog( "Socks5.start - server_thread - #{$!}" ) wlog( "Socks5.start - server_thread - #{$!}" )
end end
@ -609,7 +437,7 @@ class Socks5
end end
# #
# Stop the Socks5 server. # Stop the Socks4a server.
# #
def stop def stop
if( @running ) if( @running )