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module Ftpd
# With the commands EPORT and EPSV, the client sends a protocol code
# to indicate whether it wants an IPV4 or an IPV6 connection. This
# class contains functions related to that protocol code.
class Protocols
module Codes
IPV4 = 1
IPV6 = 2
end
include Codes
# @param socket [TCPSocket, OpenSSL::SSL::SSLSocket] The socket.
# It doesn't matter whether it's the server socket (the one on
# which #accept is called), or the socket returned by #accept.
def initialize(socket)
@socket = socket
end
# Can the socket support a connection in the indicated protocol?
#
# @param protocol_code [Integer] protocol code
def supports_protocol?(protocol_code)
protocol_codes.include?(protocol_code)
end
# What protocol codes does the socket support?
#
# @return [Array<Integer>] List of protocol codes
def protocol_codes
[
(IPV4 if supports_ipv4?),
(IPV6 if supports_ipv6?),
].compact
end
private
def supports_ipv4?
@socket.local_address.ipv4? || ipv6_dual_stack?
end
def supports_ipv6?
@socket.local_address.ipv6?
end
def ipv6_dual_stack?
v6only = @socket.getsockopt(Socket::IPPROTO_IPV6,
Socket::IPV6_V6ONLY).unpack('i')
v6only == [0]
end
end
end
Version data entries
14 entries across 14 versions & 2 rubygems