sample/dualstack-fetch.rb

DEFINITIONS

   1  # simple webpage fetcher
   2  
   3  # The code demonstrates how a multi-protocol client should be written.
   4  # TCPSocket is using getaddrinfo() internally, so there should be no problem.
   5  
   6  require "socket"
   7  
   8  if ARGV.size != 1
   9    STDERR.print "requires URL\n"
  10    exit
  11  end
  12  
  13  url = ARGV[0]
  14  if url !~ /^http:\/\/([^\/]+)(\/.*)$/
  15    STDERR.print "only http with full hostname is supported\n"
  16    exit
  17  end
  18  
  19  # split URL into host, port and path
  20  hostport = $1
  21  path = $2
  22  if (hostport =~ /^(.*):([0-9]+)$/)
  23    host = $1
  24    port = $2
  25  else
  26    host = hostport
  27    port = 80
  28  end
  29  if host =~ /^\[(.*)\]$/
  30    host = $1
  31  end
  32  
  33  #STDERR.print "url=<#{ARGV[0]}>\n"
  34  #STDERR.print "host=<#{host}>\n"
  35  #STDERR.print "port=<#{port}>\n"
  36  #STDERR.print "path=<#{path}>\n"
  37  
  38  STDERR.print "conntecting to #{host} port #{port}\n"
  39  c = TCPSocket.new(host, port)
  40  dest = Socket.getnameinfo(c.getpeername,
  41                  Socket::NI_NUMERICHOST|Socket::NI_NUMERICSERV)
  42  STDERR.print "conntected to #{dest[0]} port #{dest[1]}\n"
  43  c.print "GET #{path} HTTP/1.0\n"
  44  c.print "Host: #{host}\n"
  45  c.print "\n"
  46  while c.gets
  47    print
  48  end