class BBS::Gateway::Negotiation

The gateway’s side of the telnet negotiation with the other board, as its telnet client: it agrees to echo and go-ahead suppression, reports the caller’s window size and terminal type when asked (not for a PETSCII caller, who is a Commodore to the other board), passes BINARY on to the caller, and refuses the rest. Each option is answered once, so a board that asks again gets no loop.

Constants

AGREE: The answer to each telnet command that agrees with it.
BYTE_MASK: The low byte of a 16-bit NAWS value.
TTYPE: Telnet TERMINAL-TYPE option code.
TTYPE_IS: TERMINAL-TYPE subnegotiation: the type follows.
TTYPE_SEND: TERMINAL-TYPE subnegotiation: the other side asks for the type.

Public Class Methods

new (session, terminal:, petscii:, remote:, client:)

Source

# File lib/bbs/gateway/negotiation.rb, line 33
def initialize(session, terminal:, petscii:, remote:, client:)
  @session  = session
  @terminal = terminal
  @petscii  = petscii
  @remote   = remote
  @client   = client
  @answered = {}
  @binary   = { WILL => false, DO => false }
end

Creates the negotiation of one crossing.

session: the caller’s BBS::Session, for its window size
terminal: the terminal type reported when the other board asks
petscii: whether the other board is to take the caller for a Commodore: no window size, no terminal type
remote: a callable given the bytes (a String) for the other board
client: a callable given the bytes for the caller’s terminal

Public Instance Methods

command (command, argument)

Source

# File lib/bbs/gateway/negotiation.rb, line 45
def command(command, argument)
  command == SB ? subnegotiation(argument) : answer(command, argument)
end

Answers one command of the other board, as Telnet::Parser gives it: argument is the option, or the bytes of a subnegotiation.

window (cols, rows)

Source

# File lib/bbs/gateway/negotiation.rb, line 51
def window(cols, rows)
  naws(cols, rows) if @naws
  nil
end

Tells the other board the caller’s new window size, when it asked for it. Returns nil.