# This file is part of bish-bosh. It is subject to the licence terms in the COPYRIGHT file found in the top-level directory of this distribution and at https://raw.githubusercontent.com/raphaelcohn/bish-bosh/master/COPYRIGHT. No part of bish-bosh, including this file, may be copied, modified, propagated, or distributed except according to the terms contained in the COPYRIGHT file.
# Copyright © 2014-2015 The developers of bish-bosh. See the COPYRIGHT file in the top-level directory of this distribution and at https://raw.githubusercontent.com/raphaelcohn/bish-bosh/master/COPYRIGHT.


core_usesIn bishbosh/backend gnutls openssl socat ncat nc6 nc ncBusyBox ncDebianOpenBSD ncDebianTraditional ncSolaris ncGNU ncMacOSX ncOpenBSD ncMirBSD ncToybox devtcp cryptcat

bishbosh_backend_find()
{
	local originalIFS="$IFS"
	local IFS=','
	set -- $bishbosh_backends
	local IFS="$originalIFS"
	
	local backendName
	for backendName in $@
	do
		if bishbosh_backend_${backendName}_check; then
			bishbosh_backend_name="$backendName"
			if core_variable_isUnset bishbosh_port; then
				bishbosh_port=$(bishbosh_backend_${backendName}_port)
			fi
			if [ -n "$bishbosh_backend_path" ]; then
				core_message INFO "Using backend '$bishbosh_backend_name' (on path '$bishbosh_backend_path') with port '$bishbosh_port'"
			else
				core_message INFO "Using backend '$bishbosh_backend_name' with port '$bishbosh_port'"
			fi
			return 0
		fi
	done
	
	core_exitError $core_commandLine_exitCode_OSFILE "Could not find a backend to make socket connections with tunnelling '$bishbosh_tunnel' that was on the PATH '$PATH'."
}

core_dependency_oneOf '*' sed grep head
bishbosh_backend_netcatVariantHelpMessageLineExists()
{
	local pattern="$1"

	if core_compatibility_whichNoOutput sed; then
		local result="$("$binary" -h 2>&1 | sed -n "/${pattern}/=")"
		if [ "$result" = '1' ]; then
			bishbosh_backend_path="$binary"
			return 0
		fi
		return 1
	fi
	
	if core_compatibility_whichNoOutput grep; then
		if core_compatibility_whichNoOutput head; then
			if "$binary" -h 2>&1 | head -n 1 | grep -q -E "$pattern"; then
				bishbosh_backend_path="$binary"
				return 0
			fi
		fi
		return 1
	fi
	
	core_exitError $core_commandLine_exitCode_OSFILE "Either 'sed' or 'grep' and 'head' must be present to use the 'nc' meta-backend."
}

bishbosh_backend_debugOptions()
{
	core_message DEBUG "Passing options to backend '$bishbosh_backend_name' using '$bishbosh_backend_path' as '$(core_variable_array_passToFunctionAsArguments options echo)' (please note spaces ARE handled correctly)"
}