210 lines
4.3 KiB
Ruby
210 lines
4.3 KiB
Ruby
# -*- coding: binary -*-
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require 'socket'
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require 'fcntl'
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module Rex
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module IO
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###
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#
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# This class provides an abstraction to a stream based
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# connection through the use of a streaming socketpair.
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#
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###
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module StreamAbstraction
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###
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#
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# Extension information for required Stream interface.
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#
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###
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module Ext
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#
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# Initializes peer information.
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#
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def initinfo(peer,local)
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@peer = peer
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@local = local
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end
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#
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# Symbolic peer information.
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#
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def peerinfo
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(@peer || "Remote Pipe")
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end
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#
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# Symbolic local information.
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#
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def localinfo
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(@local || "Local Pipe")
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end
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end
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#
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# This method creates a streaming socket pair and initializes it.
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#
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def initialize_abstraction
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self.lsock, self.rsock = Rex::Socket.tcp_socket_pair()
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self.lsock.extend(Rex::IO::Stream)
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self.lsock.extend(Ext)
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self.rsock.extend(Rex::IO::Stream)
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self.monitor_rsock
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end
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#
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# This method cleans up the abstraction layer.
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#
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def cleanup_abstraction
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self.lsock.close if (self.lsock)
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self.rsock.close if (self.rsock)
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self.lsock = nil
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self.rsock = nil
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end
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#
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# Low-level write to the local side.
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#
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def syswrite(buffer)
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lsock.syswrite(buffer)
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end
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#
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# Low-level read from the local side.
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#
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def sysread(length)
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lsock.sysread(length)
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end
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#
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# Shuts down the local side of the stream abstraction.
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#
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def shutdown(how)
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lsock.shutdown(how)
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end
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#
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# Closes both sides of the stream abstraction.
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#
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def close
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cleanup_abstraction
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end
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#
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# Symbolic peer information.
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#
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def peerinfo
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"Remote-side of Pipe"
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end
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#
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# Symbolic local information.
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#
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def localinfo
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"Local-side of Pipe"
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end
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#
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# The left side of the stream.
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#
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attr_reader :lsock
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#
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# The right side of the stream.
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#
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attr_reader :rsock
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protected
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def monitor_rsock
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self.monitor_thread = Rex::ThreadFactory.spawn("StreamMonitorRemote", false) {
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loop do
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closed = false
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buf = nil
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if not self.rsock
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wlog("monitor_rsock: the remote socket is nil, exiting loop")
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break
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end
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begin
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s = Rex::ThreadSafe.select( [ self.rsock ], nil, nil, 0.2 )
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if( s == nil || s[0] == nil )
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next
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end
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rescue Exception => e
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wlog("monitor_rsock: exception during select: #{e.class} #{e}")
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closed = true
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end
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if( closed == false )
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begin
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buf = self.rsock.sysread( 32768 )
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if buf == nil
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closed = true
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wlog("monitor_rsock: closed remote socket due to nil read")
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end
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rescue EOFError => e
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closed = true
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dlog("monitor_rsock: EOF in rsock")
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rescue ::Exception => e
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closed = true
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wlog("monitor_rsock: exception during read: #{e.class} #{e}")
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end
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end
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if( closed == false )
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total_sent = 0
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total_length = buf.length
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while( total_sent < total_length )
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begin
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data = buf[total_sent, buf.length]
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# Note that this must be write() NOT syswrite() or put() or anything like it.
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# Using syswrite() breaks SSL streams.
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sent = self.write( data )
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# sf: Only remove the data off the queue is write was successfull.
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# This way we naturally perform a resend if a failure occured.
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# Catches an edge case with meterpreter TCP channels where remote send
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# failes gracefully and a resend is required.
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if (sent.nil?)
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closed = true
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wlog("monitor_rsock: failed writing, socket must be dead")
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break
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elsif (sent > 0)
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total_sent += sent
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end
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rescue ::IOError, ::EOFError => e
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closed = true
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wlog("monitor_rsock: exception during write: #{e.class} #{e}")
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break
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end
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end
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end
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if( closed )
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begin
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self.close_write if self.respond_to?('close_write')
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rescue IOError
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end
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break
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end
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end
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}
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end
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protected
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attr_accessor :monitor_thread
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attr_writer :lsock
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attr_writer :rsock
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end
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end; end
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