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#--
# =============================================================================
# Copyright (c) 2004,2005 Jamis Buck (jamis@37signals.com)
# All rights reserved.
#
# This source file is distributed as part of the Net::SSH Secure Shell Client
# library for Ruby. This file (and the library as a whole) may be used only as
# allowed by either the BSD license, or the Ruby license (or, by association
# with the Ruby license, the GPL). See the "doc" subdirectory of the Net::SSH
# distribution for the texts of these licenses.
# -----------------------------------------------------------------------------
# net-ssh website : http://net-ssh.rubyforge.org
# project website: http://rubyforge.org/projects/net-ssh
# =============================================================================
#++
require 'net/ssh/errors'
module Net
module SSH
module Transport
# Manages the negotiation of the version strings between client and
# server.
class VersionNegotiator
# For processing the version header. The version reported by the server
# must match this pattern.
VERSION_LINE = /^SSH-/
# Only versions matching this pattern are supported by Net::SSH.
REQUIRED_VERSION_PATTERN = /^SSH-(1.99|2.0)-/
# An array of lines returned by the server prior to reporting the
# version.
attr_reader :header_lines
# Creates a new VersionNegotiator object that logs to the given logger
# instance.
def initialize( logger )
@logger = logger
end
# Negotiate version information over the given socket. This will
# return the version reported by the server.
def negotiate( socket, version )
server_version = ""
@header_lines = []
loop do
server_version = socket.readline
break if server_version.nil? || VERSION_LINE.match( server_version )
@header_lines << server_version
end
if !REQUIRED_VERSION_PATTERN.match( server_version )
raise Net::SSH::Exception,
"incompatible ssh version #{server_version.inspect}"
end
if @logger.debug?
@logger.debug "remote server is #{server_version.chomp.inspect}"
end
socket.print "#{version}\r\n"
return server_version.chomp
end
end
end
end
end
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