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#!/usr/local/bin/ruby
#
# telnet.rb
# ver0.11 1998/04/21
# Wakou Aoyama <wakou@fsinet.or.jp>
#
# == make new Telnet object
# host = Telnet.new({"Binmode" => TRUE, default: TRUE
# "Host" => "localhost", default: "localhost"
# "Output_log"] => "output_log", default: not output
# "Port" => 23, default: 23
# "Prompt" => /[$%#>] $/, default: /[$%#>] $/
# "Telnetmode"] => TRUE, default: TRUE
# "Timeout"] => 10} default: 10
#
# if set "Telnetmode" option FALSE. not TELNET command interpretation.
#
# == wait for match
# print host.waitfor(/match/)
# print host.waitfor({"Match" => /match/,
# "String" => "string",
# "Timeout" => secs})
# if set "String" option. Match = Regexp.new(quote(string))
#
# realtime output. of cource, set sync=TRUE or flush is necessary.
# host.waitfor(/match/){|c| print c }
# host.waitfor({"Match" => /match/,
# "String" => "string",
# "Timeout" => secs}){|c| print c}
#
# == send string and wait prompt
# print host.cmd("string")
# print host.cmd({"String" => "string",
# "Prompt" => /[$%#>] $//,
# "Timeout" => 10})
#
# realtime output. of cource, set sync=TRUE or flush is necessary.
# host.cmd("string"){|c| print c }
# host.cmd({"String" => "string",
# "Prompt" => /[$%#>] $//,
# "Timeout" => 10}){|c| print c }
#
# == login
# host.login("username", "password")
# host.login({"Name" => "username",
# "Password" => "password",
# "Prompt" => /[$%#>] $/,
# "Timeout" => 10})
#
# and Telnet object has socket class methods
#
# == sample
# localhost = Telnet.new({"Host" => "localhost",
# "Timeout" => 10,
# "Prompt" => /[$%#>] $/})
# localhost.login("username", "password")
# print localhost.cmd("command")
# localhost.close
require "socket"
require "delegate"
class Telnet < SimpleDelegator
# For those who are curious, here are some of the special characters
# interpretted by the telnet protocol:
# Name Octal Dec. Description
CR = "\015"
LF = "\012"
EOL = CR + LF # /* end of line */
IAC = "\377" # 255 /* interpret as command: */
DONT = "\376" # 254 /* you are not to use option */
DO = "\375" # 253 /* please, you use option */
WONT = "\374" # 252 /* I won't use option */
WILL = "\373" # 251 /* I will use option */
# SB = "\372" # 250 /* interpret as subnegotiation */
# GA = "\371" # 249 /* you may reverse the line */
# EL = "\370" # 248 /* erase the current line */
# EC = "\367" # 247 /* erase the current character */
AYT = "\366" # 246 /* are you there */
# AO = "\365" # 245 /* abort output--but let prog finish */
# IP = "\364" # 244 /* interrupt process--permanently */
# BREAK = "\363" # 243 /* break */
# DM = "\362" # 242 /* data mark--for connect. cleaning */
# NOP = "\361" # 241 /* nop */
# SE = "\360" # 240 /* end sub negotiation */
# EOR = "\357" # 239 /* end of record (transparent mode) */
def initialize(options)
@options = {}
@options["Binmode"] = options["Binmode"] || TRUE
@options["Dump_Log"] = options["Dump_Log"]
@options["Errmode"] = options["Errmode"]
@options["Fhopen"] = options["Fhopen"]
@options["Host"] = options["Host"] || "localhost"
@options["Input_log"] = options["Input_log"]
@options["Input_record_separator"] = options["Input_record_separator"]
@options["Output_log"] = options["Output_log"]
@options["Output_record_separator"] = options["Output_record_separator"]
@options["Port"] = options["Port"] || 23
@options["Prompt"] = options["Prompt"] || /[$%#>] $/
@options["Telnetmode"] = options["Telnetmode"] || TRUE
@options["Timeout"] = options["Timeout"] || 10
if @options.include?("Output_log")
@log = File.open(@options["Output_log"], 'a+')
@log.sync = TRUE
@log.binmode if @options["Binmode"]
end
@sock = TCPsocket.open(@options["Host"], @options["Port"])
@sock.sync = TRUE
@sock.binmode if @options["Binmode"]
super(@sock)
end
def preprocess(str)
str.gsub!(/#{EOL}/no, "\n") # combine EOL into "\n"
# respond to "IAC DO x" or "IAC DON'T x" with "IAC WON'T x"
str.gsub!(/([^#{IAC}])?#{IAC}[#{DO}#{DONT}](.|\n)/no){
@sock << IAC << WONT << $2
$1
}
# ignore "IAC WILL x" or "IAC WON'T x"
str.gsub!(/([^#{IAC}])?#{IAC}[#{WILL}#{WONT}](.|\n)/no, '\1')
# respond to "IAC AYT" (are you there)
str.gsub!(/([^#{IAC}])?#{IAC}#{AYT}/no){
@sock << "nobody here but us pigeons" << CR
$1
}
str.gsub(/#{IAC}#{IAC}/no, IAC) # handle escaped IAC characters
end
def waitfor(options)
prompt = @options["Prompt"]
timeout = @options["Timeout"]
if options.kind_of?(Hash)
prompt = options["Prompt"] if options.include?("Prompt")
timeout = options["Timeout"] if options.include?("Timeout")
prompt = Regexp.new( Regexp.quote(options["String"]) ) if
options.include?("String")
else
prompt = options
end
line = ''
while (not prompt === line and not @sock.closed?)
next if not select([@sock], nil, nil, timeout)
begin
buf = if @options["Telnetmode"]
preprocess( @sock.sysread(1024 * 1024) )
else
@sock.sysread(1024 * 1024)
end
rescue
buf = "\nConnection closed by foreign host.\n"
@sock.close
end
@log.print(buf) if @options.include?("Output_log")
if iterator?
yield buf
end
line += buf
end
line
end
def cmd(options)
match = @options["Prompt"]
timeout = @options["Timeout"]
if options.kind_of?(Hash)
string = options["String"]
match = options["Match"] if options.include?("Match")
timeout = options["Timeout"] if options.include?("Timeout")
else
string = options
end
@sock << string.gsub(/\n/, CR) << CR
if iterator?
waitfor({"Prompt" => match, "Timeout" => timeout}){|c| yield c }
else
waitfor({"Prompt" => match, "Timeout" => timeout})
end
end
def login(options, password = nil)
if options.kind_of?(Hash)
username = options["Name"]
password = options["Password"]
else
username = options
end
line = waitfor(/login[: ]*$/)
line += cmd({"String" => username, "Match" => /Password[: ]*$/})
line += cmd(password)
line
end
end
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