connect failure scenarios

tests/fakes/dest/hello_wrong_size.rb

@@ -0,0 +1,44 @@
+#!/usr/bin/env ruby
+
+# Simulate a server which has a disc of the wrong size attached: send
+# a valid NBD hello with a random size, then check that we have see an
+# EOF on read.
+
+addr, port = *ARGV
+
+require 'socket'
+require 'timeout'
+require 'flexnbd/constants'
+
+sock = TCPServer.new( addr, port )
+client_sock = nil
+
+begin
+  Timeout.timeout(2) do
+    client_sock = sock.accept
+  end
+rescue Timeout::Error
+  $stderr.puts "Timed out waiting for a connection"
+  exit 1
+end
+
+t = Thread.new do
+  begin
+    Timeout.timeout(FlexNBD::MS_RETRY_DELAY_SECS + 1) do
+      client_sock2 = sock.accept
+    end
+  rescue Timeout::Error
+    $stderr.puts "Timed out waiting for a reconnection"
+    exit 1
+  end
+end
+
+client_sock.write( "NBDMAGIC" )
+client_sock.write( "\x00\x00\x42\x02\x81\x86\x12\x53" )
+8.times do client_sock.write rand(256).chr end
+client_sock.write( "\x00" * 128 )
+
+
+t.join
+
+exit 0