flexnbd-c/tests/acceptance/fakes/dest/write_wrong_magic.rb

#!/usr/bin/env ruby
# Accept a connection, write hello, wait for a write request, read the
# data, then write back a reply with a bad magic field.  We then
# expect a reconnect.

require 'flexnbd/fake_dest'
include FlexNBD

addr, port = *ARGV
server = FakeDest.new(addr, port)

client = server.accept
client.write_hello
req = client.read_request
client.read_data(req[:len])
client.write_reply(req[:handle], 0, magic: :wrong)

client2 = server.accept
client.close
client2.close

exit(0)