166 lines
3.5 KiB
Ruby
166 lines
3.5 KiB
Ruby
# -*- coding: binary -*-
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require 'rex/socket'
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###
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#
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# This class provides methods for interacting with a UDP socket.
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#
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###
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module Rex::Socket::Udp
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include Rex::Socket
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##
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#
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# Factory
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#
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##
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#
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# Creates the client using the supplied hash.
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#
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def self.create(hash = {})
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hash['Proto'] = 'udp'
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# If we have are to bind to a LocalHost we must be a Server to avail of pivoting.
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# Rex::Socket::Parameters will subsequently turn off the sever flag after the correct
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# comm has been chosen.
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if( hash['LocalHost'] )
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hash['Server'] = true
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end
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self.create_param(Rex::Socket::Parameters.from_hash(hash))
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end
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#
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# Wrapper around the base socket class' creation method that automatically
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# sets the parameter's protocol to UDP.
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#
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def self.create_param(param)
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param.proto = 'udp'
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Rex::Socket.create_param(param)
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end
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##
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#
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# UDP connected state methods
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#
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##
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#
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# Write the supplied datagram to the connected UDP socket.
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#
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def write(gram)
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begin
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return syswrite(gram)
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rescue ::Errno::EHOSTUNREACH,::Errno::ENETDOWN,::Errno::ENETUNREACH,::Errno::ENETRESET,::Errno::EHOSTDOWN,::Errno::EACCES,::Errno::EINVAL,::Errno::EADDRNOTAVAIL
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return nil
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end
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end
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alias put write
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#
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# Read a datagram from the UDP socket.
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#
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def read(length = 65535)
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if length < 0
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length = 65535
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end
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return sysread(length)
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end
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#
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# Read a datagram from the UDP socket with a timeout
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#
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def timed_read(length = 65535, timeout=def_read_timeout)
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begin
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if ((rv = ::IO.select([ fd ], nil, nil, timeout)) and
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(rv[0]) and (rv[0][0] == fd)
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)
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return read(length)
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else
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return ''
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end
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rescue Exception
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return ''
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end
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end
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#alias send write
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#alias recv read
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##
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#
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# UDP non-connected state methods
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#
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##
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#
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# Sends a datagram to the supplied host:port with optional flags.
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#
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def sendto(gram, peerhost, peerport, flags = 0)
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# Catch unconnected IPv6 sockets talking to IPv4 addresses
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peer = Rex::Socket.resolv_nbo(peerhost)
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if (peer.length == 4 and self.ipv == 6)
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peerhost = Rex::Socket.getaddress(peerhost, true)
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if peerhost[0,7].downcase != '::ffff:'
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peerhost = '::ffff:' + peerhost
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end
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end
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begin
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send(gram, flags, Rex::Socket.to_sockaddr(peerhost, peerport))
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rescue ::Errno::EHOSTUNREACH,::Errno::ENETDOWN,::Errno::ENETUNREACH,::Errno::ENETRESET,::Errno::EHOSTDOWN,::Errno::EACCES,::Errno::EINVAL,::Errno::EADDRNOTAVAIL
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return nil
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end
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end
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#
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# Receives a datagram and returns the data and host:port of the requestor
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# as [ data, host, port ].
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#
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def recvfrom(length = 65535, timeout=def_read_timeout)
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begin
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if ((rv = ::IO.select([ fd ], nil, nil, timeout)) and
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(rv[0]) and (rv[0][0] == fd)
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)
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data, saddr = recvfrom_nonblock(length)
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af, host, port = Rex::Socket.from_sockaddr(saddr)
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return [ data, host, port ]
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else
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return [ '', nil, nil ]
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end
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rescue ::Timeout::Error
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return [ '', nil, nil ]
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rescue ::Interrupt
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raise $!
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rescue ::Exception
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return [ '', nil, nil ]
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end
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end
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#
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# Calls recvfrom and only returns the data
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#
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def get(timeout=nil)
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data, saddr, sport = recvfrom(65535, timeout)
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return data
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end
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#
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# The default number of seconds to wait for a read operation to timeout.
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#
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def def_read_timeout
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10
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end
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def type?
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return 'udp'
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end
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end
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