internal void ExecuteLinux()

in Lib/Collectors/FirewallCollector.cs [49:120]
61 lines of code
16 McCabe index (conditional complexity)

        internal void ExecuteLinux(CancellationToken cancellationToken)
        {
            if (ExternalCommandRunner.RunExternalCommand("iptables", "-S", out string result, out string _) == 0)
            {
                var lines = new List<string>(result.Split('\n'));

                Dictionary<string, FirewallAction> defaultPolicies = new Dictionary<string, FirewallAction>();

                foreach (var line in lines)
                {
                    if (cancellationToken.IsCancellationRequested) { return; }

                    if (line.StartsWith("-P"))
                    {
                        var chainName = line.Split(' ')[1];
                        defaultPolicies.Add(chainName, line.Contains("ACCEPT") ? FirewallAction.Allow : FirewallAction.Block);
                        var obj = new FirewallObject($"Default {chainName} policy")
                        {
                            Action = defaultPolicies[chainName],
                            FriendlyName = $"Default {chainName} policy",
                            Scope = FirewallScope.All
                        };
                        if (!chainName.Equals("FORWARD"))
                        {
                            obj.Direction = chainName.Equals("INPUT") ? FirewallDirection.Inbound : FirewallDirection.Outbound;
                        }

                        HandleChange(obj);
                    }
                    else if (line.StartsWith("-A"))
                    {
                        var splits = line.Split(' ');
                        var chainName = splits[1];

                        var obj = new FirewallObject(line)
                        {
                            Action = (splits[Array.IndexOf(splits, "-j") + 1] == "ACCEPT") ? FirewallAction.Allow : FirewallAction.Block,
                            FriendlyName = line,
                            Scope = FirewallScope.All,
                            Protocol = splits[Array.IndexOf(splits, "-p") + 1]
                        };

                        if (Array.IndexOf(splits, "--dport") > 0)
                        {
                            obj.RemotePorts = splits[Array.IndexOf(splits, "--dport") + 1].OfType<string>().ToList();
                        }

                        if (Array.IndexOf(splits, "-d") > 0)
                        {
                            obj.RemoteAddresses = splits[Array.IndexOf(splits, "-d") + 1].OfType<string>().ToList();
                        }

                        if (Array.IndexOf(splits, "-s") > 0)
                        {
                            obj.LocalAddresses = splits[Array.IndexOf(splits, "-s") + 1].OfType<string>().ToList();
                        }

                        if (Array.IndexOf(splits, "--sport") > 0)
                        {
                            obj.LocalPorts = splits[Array.IndexOf(splits, "--sport") + 1].OfType<string>().ToList();
                        }

                        if (!chainName.Equals("FORWARD"))
                        {
                            obj.Direction = chainName.Equals("INPUT") ? FirewallDirection.Inbound : FirewallDirection.Outbound;
                        }

                        HandleChange(obj);
                    }
                }
            }
        }