dns, WIP autoconfiguration, context...

src/main.cr

@@ -3,51 +3,57 @@ require "option_parser"
 require "ipaddress"
 require "./colors"
 
-simulation = false
+class Context
-file = nil
+	class_property root : String = "/"
 	
-prefered_network_configuration_program = nil
+	class_property simulation = false
-prefered_wireless_configuration_program = nil
+	class_property verbosity = 1
-prefered_dhcp_client = nil
 
-root = "/"
+	class_property prefered_network_configuration_program : String? = nil
-print_autodetect = false
+	class_property prefered_wireless_configuration_program : String? = nil
+	class_property prefered_dhcp_client : String? = nil
 
-command = "list"
+	class_property root = "/"
-args = Array(String).new
+	class_property print_autodetect = false
+
+	class_property command = "list"
+	class_property args = Array(String).new
+end
+
+file_option : String? = nil
 
 OptionParser.parse! do |parser|
 	parser.on "-s", "--simulation", "Export the network configuration." do
-		simulation = true
+		Context.simulation = true
 	end
 
 	parser.on "-a", "--print-autodetect", "Print autodetection of the installed programs." do
-		print_autodetect = true
+		Context.print_autodetect = true
 	end
 
 	parser.on "-w wireless-configuration-program", "--wireless wireless-configuration-program", "iw" do |prog|
-		prefered_wireless_configuration_program = prog
+		Context.prefered_wireless_configuration_program = prog
 	end
 
 	parser.on "-n network-configuration-program", "--net-conf network-configuration-program", "ifconfig | ip" do |prog|
-		prefered_network_configuration_program = prog
+		Context.prefered_network_configuration_program = prog
 	end
 
 	parser.on "-d dhcp-client-program", "--dhcp-client dhcp-client-program", "udhcpc | dhclient" do |prog|
-		prefered_dhcp_client = prog
+		Context.prefered_dhcp_client = prog
 	end
 
 	parser.on "-r root", "--root root", "Root where to search for <root>/etc/hostname.* files." do |optsn|
-		root = optsn
+		Context.root = optsn
 	end
 
 	parser.on "-f file", "--file file", "Parse a configuration file." do |optsn|
-		file = optsn
+		file_option = optsn
 	end
 
 	# 0: nothing is printed, 1: only events, 2: events and messages
 	parser.on "-v verbosity", "--verbosity verbosity", "Verbosity (0-2). Default: 1" do |optsn|
-		verbosity = optsn.to_i
+		Context.verbosity = optsn.to_i
 	end
 
 	parser.missing_option do |opt|
@@ -62,16 +68,16 @@ OptionParser.parse! do |parser|
 	end
 
 	parser.unknown_args do |arg|
-		command = arg.shift
+		Context.command = arg.shift
-		args = arg
+		Context.args = arg
 
-		case command
+		case Context.command
 		when /^(list)/
 		when /^(up)/
 		when /^(down)/
 		when /^(scan)/
 		else
-			STDERR.puts "Command #{command} not understood"
+			STDERR.puts "Command #{Context.command} not understood"
 			exit 1
 		end
 
@@ -115,6 +121,12 @@ class NotSetup
 	end
 end
 
+class Autoconfiguration
+	def to_s(io : IO)
+		io << "autoconfiguration"
+	end
+end
+
 class DHCP
 	def to_s(io : IO)
 		io << "dhcp"
@@ -127,6 +139,21 @@ class NetworkCommands
 	class_property cmd_wireless_configuration : IfconfigCommand.class | IWCommand.class | NotSetup.class = NotSetup
 	class_property cmd_dhcp_client : UDHCPCCommand.class | DHClientCommand.class | NotSetup.class = NotSetup
 
+	class DNS
+		def initialize(@addresses : Array(String), @search : Array(String))
+		end
+
+		def execute
+			File.open("#{Context.root}/etc/resolv.conf", "w") do |file|
+				@addresses.each do |address|
+					file.puts "nameserver #{address}\n"
+				end
+
+				file.puts "search #{@search.join(" ")}"
+			end
+		end
+	end
+
 	class IWCommand
 		# get the available SSID
 		def self.scan(ifname : String) : Array(String)
@@ -338,6 +365,10 @@ class NetworkCommands
 		end
 	end
 
+	def self.autoconfiguration(ifname : String)
+		puts "TODO: IPv6 autoconfiguration setup"
+	end
+
 	def self.wireless_connect_wpa_psk(ifname : String, ssid : String, passwd : String)
 		cmd = @@cmd_wireless_configuration
 		case cmd
@@ -358,7 +389,7 @@ class WirelessAPSetup
 	property description : String?
 	property mtu : Int32?
 	property main_ip_v4 : IPAddress | DHCP | NotSetup
-	property main_ip_v6 : IPAddress | DHCP | NotSetup
+	property main_ip_v6 : IPAddress | DHCP | Autoconfiguration | NotSetup
 	property aliasses_v4 : Array(IPAddress)
 	property aliasses_v6 : Array(IPAddress)
 	property dns : Array(IPAddress)
@@ -397,29 +428,23 @@ class WirelessAPSetup
 			# ipv4
 			unless main_ip_v4.is_a?(NotSetup)
 				str << "\t\tinet #{main_ip_v4}\n"
-			end
 
-			aliasses_v4.each do |a|
+				aliasses_v4.each do |a|
-				str << "\t\talias #{a}\n"
+					str << "\t\talias #{a}\n"
+				end
 			end
 
 			# ipv6
 			unless main_ip_v6.is_a?(NotSetup)
 				str << "\t\tinet6 #{main_ip_v6}\n"
-			end
 
-			unless @aliasses_v6.empty?
 				@aliasses_v6.each do |a|
 					str << "\t\talias6 #{a}\n"
 				end
 			end
 
-			if dns.empty?
+			dns.each do |ip|
-				str << "\t\tno dns configured\n"
+				str << "\t\tdns: #{ip}\n"
-			else
-				dns.each do |ip|
-					str << "\t\tdns: #{ip}\n"
-				end
 			end
 
 			# to improve readability
@@ -441,7 +466,7 @@ class InterfaceConfiguration
 	property mtu : Int32?
 	property wireless : Bool
 	property main_ip_v4 : IPAddress | DHCP | NotSetup
-	property main_ip_v6 : IPAddress | DHCP | NotSetup
+	property main_ip_v6 : IPAddress | Autoconfiguration | DHCP | NotSetup
 	property aliasses_v4 : Array(IPAddress)
 	property aliasses_v6 : Array(IPAddress)
 	property wireless_networks : Hash(String, WirelessAPSetup)
@@ -490,25 +515,33 @@ class InterfaceConfiguration
 			# ipv4
 			unless main_ip_v4.is_a?(NotSetup)
 				str << "\tinet #{main_ip_v4}\n"
-			end
 
-			unless aliasses_v4.empty?
 				aliasses_v4.each do |a|
 					str << "\talias #{a}\n"
 				end
 			end
 
+			# warning: alias but no main ip address
+			if main_ip_v4.is_a?(NotSetup) && ! aliasses_v4.empty?
+				str << "\t#{CRED}alias configured but no main ipv4 configuration.#{CRESET}\n"
+				str << "\t#{CRED}Should main ipv4 be obtained from DHCP? Static configuration?#{CRESET}\n"
+			end
+
 			# ipv6
 			unless main_ip_v6.is_a?(NotSetup)
 				str << "\tinet6 #{main_ip_v6}\n"
-			end
 
-			unless aliasses_v6.empty?
 				aliasses_v6.each do |a|
 					str << "\talias6 #{a}\n"
 				end
 			end
 
+			# warning: alias but no main ip address
+			if main_ip_v6.is_a?(NotSetup) && ! aliasses_v6.empty?
+				str << "\t#{CRED}alias6 configured but no main ipv6 configuration.#{CRESET}\n"
+				str << "\t#{CRED}Should main ipv6 be obtained from autoconfiguration? DHCP? Static configuration?#{CRESET}\n"
+			end
+
 			unless dns.empty?
 				dns.each do |ip|
 					str << "\tdns: #{ip}\n"
@@ -531,6 +564,17 @@ class InterfaceConfiguration
 			raise "The interface #{@name} doesn't exists, yet."
 		end
 
+		# TODO: treat differently wireless and non-wireless interfaces
+		if @wireless
+			puts "interface #{name} is wireless"
+			puts "TODO:"
+			puts "1. scan for SSID"
+			puts "2. select configured SSID then try to connect"
+			puts "3. connectivity check with the gateway"
+		else
+			puts "interface #{name} is not wireless"
+		end
+
 		if up
 			NetworkCommands.up name
 		else
@@ -569,19 +613,22 @@ class InterfaceConfiguration
 
 		# ipv6 configuration
 		main_ip_v6.tap do |ip|
+			puts "CONFIGURATION IPV6"
 
 			case ip
 			when IPAddress
 				NetworkCommands.set_ip name, ip
 			# TODO
-			#when Autoconfiguration
+			when Autoconfiguration
-			#	NetworkCommands.autoconfiguration name
+				puts "CONFIGURATION IPV6 : autoconfiguration !!!"
+				NetworkCommands.autoconfiguration name
 			#when DHCP
 			#	NetworkCommands.dhcp6 name
 			when NotSetup
 				# do nothing
+				puts "CONFIGURATION IPV6 : not setup !!!"
 			else
-				raise "ipv4 configuration: neither static nor dynamic"
+				raise "ipv6 configuration: neither static nor dynamic"
 			end
 
 			# We wont setup aliasses unless there is an actual IP address
@@ -661,7 +708,7 @@ class NetworkConfigurationParser
 				end
 			when /^inet6 autoconf/
 				# IP address is autoconfigured
-				puts "TODO: IPv6 autoconfiguration"
+				main_ip_v6 = Autoconfiguration.new
 
 			when /^inet6? .*/
 				ipstr = /^inet6? ([a-f0-9:.\/]+)/.match(line).try &.[1]
@@ -710,8 +757,9 @@ class NetworkConfigurationParser
 					next
 				end
 
-				# TODO
 				access_point = wireless_networks[ssid].not_nil!
+				access_point.main_ip_v6 = Autoconfiguration.new
+				puts "for SSID: #{ssid} ipv6 configuration = autoconf"
 
 			when /^network [^ \t]+ inet6? .*/
 				ssid = nil
@@ -841,8 +889,8 @@ class Autodetect
 end
 
 
-Do.simulation = simulation
+Do.simulation = Context.simulation
-Autodetect.print_autodetect = print_autodetect
+Autodetect.print_autodetect = Context.print_autodetect
 
 #
 # discover available configuration commands
@@ -867,17 +915,17 @@ possible_wireless_configuration_cmds = {
 	"ifconfig" => NetworkCommands::IfconfigCommand
 }
 
-key = prefered_network_configuration_program
+key = Context.prefered_network_configuration_program
 key = possible_network_configuration_cmds.keys.find { |key| Autodetect.which(key) } if key.nil?
 # should crash if there is no network command installed
 NetworkCommands.cmd_network_configuration = possible_network_configuration_cmds[key.not_nil!]
 
-key = prefered_dhcp_client
+key = Context.prefered_dhcp_client
 key = possible_dhcp_clients.keys.find { |key| Autodetect.which(key) } if key.nil?
 # should not crash if there is no 
 NetworkCommands.cmd_dhcp_client = possible_dhcp_clients[key] unless key.nil?
 
-key = prefered_wireless_configuration_program
+key = Context.prefered_wireless_configuration_program
 key = possible_wireless_configuration_cmds.keys.find { |key| Autodetect.which(key) } if key.nil?
 # should crash if there is no wireless command installed
 NetworkCommands.cmd_wireless_configuration = possible_wireless_configuration_cmds[key.not_nil!]
@@ -885,7 +933,7 @@ NetworkCommands.cmd_wireless_configuration = possible_wireless_configuration_cmd
 
 
 files = Array(String).new
-Dir.children("#{root}/etc/").each do |f|
+Dir.children("#{Context.root}/etc/").each do |f|
 	if /^hostname\./.match(f)
 		files << f
 	end
@@ -893,46 +941,43 @@ end
 
 interface_files = Array(String).new
 
-if ! file.nil?
+if ! file_option.nil?
 	# file passed via the '-f' option
 	# TODO: why having to force "not_nil!" ? Seems like a compiler bug
-	interface_files << file.not_nil!
+	interface_files << file_option.not_nil!
-elsif args.empty?
+elsif Context.args.empty?
 	# every configured interface
 	files.each do |f|
-		interface_files << "#{root}/etc/#{f}"
+		interface_files << "#{Context.root}/etc/#{f}"
 	end
 else
 	# only interfaces in arguments
-	args.each do |interface|
+	Context.args.each do |interface|
-		interface_files << "#{root}/etc/hostname.#{interface}"
+		interface_files << "#{Context.root}/etc/hostname.#{interface}"
 	end
 end
 
 
 
 begin
-	case command
+	case Context.command
 	when "list"
 		interface_files.each do |f|
-			puts NetworkConfigurationParser.parse_file(f.not_nil!)
+			puts NetworkConfigurationParser.parse_file(f)
 		end
 	when "up"
-		# TODO: why having to force "not_nil!" ? Seems like a compiler bug
 		interface_files.each do |f|
-			network_configuration = NetworkConfigurationParser.parse_file(f.not_nil!)
+			network_configuration = NetworkConfigurationParser.parse_file(f)
 			network_configuration.execute
 		end
 	when "down"
-		# TODO: why having to force "not_nil!" ? Seems like a compiler bug
 		interface_files.each do |f|
-			network_configuration = NetworkConfigurationParser.parse_file(f.not_nil!)
+			network_configuration = NetworkConfigurationParser.parse_file(f)
 			network_configuration.down
 		end
 	when "scan"
-		# TODO: why having to force "not_nil!" ? Seems like a compiler bug
 		interface_files.each do |f|
-			network_configuration = NetworkConfigurationParser.parse_file(f.not_nil!)
+			network_configuration = NetworkConfigurationParser.parse_file(f)
 			network_configuration.scan
 		end
 	end