From: M Mohr <messju@...>
Date: 2002-09-10T00:31:36+09:00
Subject: Re: getting the IP address of the local machine

Tom Sawyer <transami@transami.net> writes:

> oh and one other thing: how to find a free port?

you have to search a free port with trial-and-error  AFAIK.
(maybe this can be done more elegant, I'm pretty new to ruby) :

[schnipp]
#!/usr/bin/env ruby

require 'socket'

# our port-range, in which we try to establish a listener
ports = 2090..2100

# "define" these, to make them visible outside the iterator
server = nil
port = nil

# search for port
go = false
ports.each { |port|
  printf("trying port %d\n", port)

  begin
    server = TCPServer.new('127.0.0.1', port)
    go = true
    break

  rescue Errno::EADDRINUSE
    # debug output
    $stderr.print "listen on #{port} failed: " + $! + "\n"
  end
}

# listen
if (go)
  $stderr.printf("using port %d\n", port)
  
  while (go && (session=server.accept))
#
# your server goes here 
#
  end
end
[schnapp]

regards
messju


> On Mon, 2002-09-09 at 03:50, Tom Sawyer wrote:
> > does anyone know how to get the IP address of the machine a ruby script
> > is running on?
> > 
> > -thanks
> > 
> > -- 
> > tom sawyer, aka transami
> > transami@transami.net
> > 
> > 
> -- 
> tom sawyer, aka transami
> transami@transami.net