feat: F4.6g3 a computer's firewall window, measured against Java's with traffic from two networks

The firewall-pc scenario and FirewallWindowRun use Java's window as a person
does and send a ping, a TCP connection and a DNS question from the server's
network and from behind the router after each step. The core adds and
removes port rules (personalFirewall.ts) and writes both into the firewall's
log, which now carries each line's time; the room takes the window's
actions and sends its view and the log as lines; the editor shows Java's
window with its two tabs. Not adopted from Java: any integer as a port,
a port after a space refused without a word, a log one can type into.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

packages/core/src/index.ts

@@ -26,6 +26,7 @@ export * from './runtime/apps/dnsServer.js';
 export * from './runtime/apps/web.js';
 export * from './runtime/apps/routerPages.js';
 export * from './runtime/apps/firewallSettings.js';
+export * from './runtime/apps/personalFirewall.js';
 export * from './runtime/apps/emailServer.js';
 export * from './runtime/apps/emailClient.js';
 export * from './runtime/apps/filePrograms.js';

packages/core/src/runtime/apps/personalFirewall.ts

@@ -0,0 +1,49 @@
+// A computer's firewall as its window changes it, after Java's
+// GUIApplicationFirewallWindow (measured with tools/java-oracle's
+// FirewallWindowRun): a port rule added — the port opened for TCP, UDP or
+// both, for all senders or only those of the computer's networks — and a
+// rule removed. The three boxes are the configuration's fields; what the
+// firewall does with a packet is the engine's (evaluateFirewall), as for a
+// router.
+//
+// Departures from Java (firewallWindow.test.ts names each):
+// - a port is 1 to 65535, spaces around it allowed. Java takes any int:
+//   -1 opens every port of both protocols (the table shows no port), 0 or
+//   70000 make a rule that never matches; and refuses " 80" without a word.
+
+import { DIRECTLY_CONNECTED_SOURCE_MARKER, firewallRule, type FirewallConfiguration, type FirewallProtocol, type FirewallRule } from '../config.js';
+
+/** The protocols of the window's list: TCP, UDP, "*" for both. */
+export type PortRuleProtocol = Exclude<FirewallProtocol, 'icmp'>;
+
+/** The port typed, as the window takes it: 1 to 65535; undefined for anything else. */
+export function firewallPortOfText(text: string): number | undefined {
+  const trimmed = text.trim();
+  if (!/^[0-9]+$/.test(trimmed)) return undefined;
+  const port = Number(trimmed);
+  return port >= 1 && port <= 65_535 ? port : undefined;
+}
+
+/** "Hinzufügen" (hinzuRegel): a rule accepting the port, at the end; Java's FirewallRule("", "", "", "", port, protocol, ACCEPT). */
+export function withPortRule(configuration: FirewallConfiguration, port: number, protocol: PortRuleProtocol, sameNetworkOnly: boolean): FirewallConfiguration {
+  const rule = firewallRule({ port, protocol, action: 'accept', sourceIPAddress: sameNetworkOnly ? DIRECTLY_CONNECTED_SOURCE_MARKER : '' });
+  return { ...configuration, rules: [...configuration.rules, rule] };
+}
+
+/** "Löschen" (loescheRegel): the rule chosen; undefined when there is none at that row. */
+export function withoutRule(configuration: FirewallConfiguration, index: number): FirewallConfiguration | undefined {
+  if (!Number.isInteger(index) || index < 0 || index >= configuration.rules.length) return undefined;
+  return { ...configuration, rules: configuration.rules.filter((_, each) => each !== index) };
+}
+
+/**
+ * How the window's table shows a rule: Java's sender column, or none for a
+ * rule the window cannot make (one from a file that drops, or names an
+ * address; a mask without its address counts for nothing). Java shows such a
+ * rule as a port opened for all senders.
+ */
+export function portRuleSender(rule: FirewallRule): 'all' | 'sameNetwork' | undefined {
+  if (rule.action !== 'accept' || rule.destinationIPAddress !== '') return undefined;
+  if (rule.sourceIPAddress === '') return 'all';
+  return rule.sourceIPAddress === DIRECTLY_CONNECTED_SOURCE_MARKER ? 'sameNetwork' : undefined;
+}

packages/core/src/runtime/apps/routerPages.ts

@@ -11,6 +11,7 @@
 
 import type { FirewallRule } from '../config.js';
 import type { FirewallLogEntry } from '../engine.js';
+import type { PortRuleProtocol } from './personalFirewall.js';
 import { formatIPv4, maskAddress, parseIPv4 } from '../ipv4.js';
 import type { RouteRow } from '../routeTable.js';
 import { DIRECTLY_CONNECTED_SOURCE_MARKER } from '../config.js';
@@ -40,6 +41,8 @@ interface PageTexts {
   readonly logBody: string;
   readonly ruleMatched: string;
   readonly icmpDropped: string;
+  readonly portRuleAdded: string;
+  readonly portRuleRemoved: string;
   readonly accept: string;
   readonly drop: string;
   readonly ripHint: string;
@@ -57,6 +60,9 @@ const TEXTS: Record<PageLanguage, PageTexts> = {
     /** sw_firewall_msg8, firewallthread_msg1, jfirewalldialog_msg33, msg34. */
     ruleMatched: 'Firewall-Regel hat gegriffen:',
     icmpDropped: 'ICMP-Paket verworfen:',
+    /** sw_firewall_msg5, msg7: a computer's window writes them (no router has one). */
+    portRuleAdded: 'Portregel wurde hinzugefügt:',
+    portRuleRemoved: 'Portregel wurde entfernt.',
     accept: 'akzeptieren',
     drop: 'verwerfen',
     /** sw_vermittlungweb_msg1, msg3, msg4, msg5, msg6. */
@@ -71,6 +77,8 @@ const TEXTS: Record<PageLanguage, PageTexts> = {
     logBody: '\n\t</head>\n\t<body>\n\t\t<h2>Log-data set entry of the firewall</h2>',
     ruleMatched: 'Firewall rule matched:',
     icmpDropped: 'Dropped ICMP packet:',
+    portRuleAdded: 'Port rule is added:',
+    portRuleRemoved: 'Delete port rule.',
     accept: 'accept',
     drop: 'drop',
     ripHint: 'This table is generated and updated by the Routing Information Protocol (RIP).',
@@ -113,11 +121,19 @@ export function firewallRuleText(rule: FirewallRule, firstInterface: { readonly
   return text + (rule.action === 'accept' ? 'ACCEPT' : 'DROP');
 }
 
-/** A line of the firewall's log, as Firewall tells its observers. */
+/** The window's protocol list (GUIApplicationFirewallWindow): its items name a port rule in the log. */
+export const PORT_RULE_PROTOCOL_NAMES: Readonly<Record<PortRuleProtocol, string>> = { tcp: 'TCP', udp: 'UDP', all: '*' };
+
+/** A line of the firewall's log, as Firewall tells its observers (and a computer's window writes). */
 export function firewallLogText(entry: FirewallLogEntry, language: PageLanguage): string {
   const texts = TEXTS[language];
-  if (entry.kind === 'icmpDropped') {
-    return `${texts.icmpDropped} ${entry.senderIPAddress} -> ${entry.receiverIPAddress} (code: ${entry.code}, type: ${entry.type})`;
+  switch (entry.kind) {
+    case 'icmpDropped':
+      return `${texts.icmpDropped} ${entry.senderIPAddress} -> ${entry.receiverIPAddress} (code: ${entry.code}, type: ${entry.type})`;
+    case 'portRuleAdded':
+      return `${texts.portRuleAdded} ${entry.port}/${PORT_RULE_PROTOCOL_NAMES[entry.protocol]}`;
+    case 'portRuleRemoved':
+      return texts.portRuleRemoved;
   }
   return `${texts.ruleMatched} #${entry.ruleNumber} (${firewallRuleText(entry.rule, entry.firstInterface)})  -> ${firewallActionText(entry.accepted ? 'accept' : 'drop', language)}`;
 }

packages/core/src/runtime/engine.ts

@@ -124,6 +124,8 @@ import { EmailServer } from './apps/emailServer.js';
 import { Terminal } from './apps/terminal.js';
 import { firewallLogPage, forwardingTablePage, ripTablePage, routerIndexPage } from './apps/routerPages.js';
 import { applyFirewallSettings, firewallSettingsPage } from './apps/firewallSettings.js';
+import { withoutRule, withPortRule, type PortRuleProtocol } from './apps/personalFirewall.js';
+import type { LogLine } from './apps/program.js';
 import { parentPath, VirtualFileSystem } from '../model/virtualFileSystem.js';
 import { clientAccountFileText, EMAIL_CLIENT_ACCOUNT_FILE, EMAIL_SERVER_ACCOUNTS_FILE, serverAccountsFileText } from './emailAccountsFile.js';
 import { GNUTELLA_FOLDER, GnutellaPeer } from './apps/gnutella.js';
@@ -320,10 +322,11 @@ export interface FirewallDecision {
 
 /**
  * A line of a firewall's log (Firewall.benachrichtigeBeobachter, shown by
- * the router's page "log"): a rule that matched a TCP or UDP packet, with
- * the node's first interface (the rule's text names its network for "any
- * directly connected network"), or an ICMP packet dropped by the general
- * setting.
+ * the router's page "log" and a computer's firewall window): a rule that
+ * matched a TCP or UDP packet, with the node's first interface (the rule's
+ * text names its network for "any directly connected network"), or an ICMP
+ * packet dropped by the general setting; and, from a computer's window
+ * (Java writes them into the window only), a port rule added or removed.
  */
 export type FirewallLogEntry =
   | {
@@ -333,7 +336,9 @@ export type FirewallLogEntry =
       readonly firstInterface: { readonly ipAddress: string; readonly subnetMask: string } | undefined;
       readonly accepted: boolean;
     }
-  | { readonly kind: 'icmpDropped'; readonly senderIPAddress: string; readonly receiverIPAddress: string; readonly type: number; readonly code: number };
+  | { readonly kind: 'icmpDropped'; readonly senderIPAddress: string; readonly receiverIPAddress: string; readonly type: number; readonly code: number }
+  | { readonly kind: 'portRuleAdded'; readonly port: number; readonly protocol: PortRuleProtocol }
+  | { readonly kind: 'portRuleRemoved' };
 
 export type RuntimePhase = 'stopped' | 'running';
 
@@ -945,7 +950,7 @@ export class NetworkRuntimeEngine {
   /** The time of day a program writes into a mail (Java's new Date()). */
   private readonly wallClock: () => number;
   /** Each node's firewall log; it outlives a stop and a new start, as Java's log page does. */
-  private readonly firewallLogsByNodeId = new Map<Id, FirewallLogEntry[]>();
+  private readonly firewallLogsByNodeId = new Map<Id, LogLine<FirewallLogEntry>[]>();
   /** Accepted connections a program has taken (acceptTcpSteps). */
   private readonly handedOutTcpSocketIds = new Set<Id>();
   private nextApplicationWakeId = 1;
@@ -1127,12 +1132,12 @@ export class NetworkRuntimeEngine {
   }
 
   /** The node's firewall log, since the engine was made. */
-  firewallLog(nodeId: Id): readonly FirewallLogEntry[] {
+  firewallLog(nodeId: Id): readonly LogLine<FirewallLogEntry>[] {
     return this.firewallLogsByNodeId.get(nodeId) ?? [];
   }
 
   private logFirewall(nodeId: Id, entry: FirewallLogEntry): void {
-    getOrCreate(this.firewallLogsByNodeId, nodeId, () => []).push(entry);
+    getOrCreate(this.firewallLogsByNodeId, nodeId, () => []).push({ ...entry, timeMilliseconds: this.stateValue.currentTimeMilliseconds });
   }
 
   /** Firewall.notifyRuleApplication. */
@@ -5615,6 +5620,31 @@ export class NetworkRuntimeEngine {
     return this.stateValue.topologySnapshot.firewallConfigurationsByNodeId.get(nodeId) ?? firewallConfiguration();
   }
 
+  /** A computer's firewall, when it has one installed (a router's is no program; its page changes it). */
+  personalFirewall(nodeId: Id): FirewallConfiguration | undefined {
+    const node = this.nodeSnapshot(nodeId);
+    return node !== undefined && isPcClassEndpoint(node.kind) ? this.stateValue.topologySnapshot.firewallConfigurationsByNodeId.get(nodeId) : undefined;
+  }
+
+  /** The window's "Hinzufügen": the port opened, written into its log; false for a computer without a firewall. */
+  addFirewallPortRule(nodeId: Id, port: number, protocol: PortRuleProtocol, sameNetworkOnly: boolean): boolean {
+    const configuration = this.personalFirewall(nodeId);
+    if (configuration === undefined) return false;
+    this.setFirewallConfiguration(nodeId, withPortRule(configuration, port, protocol, sameNetworkOnly));
+    this.logFirewall(nodeId, { kind: 'portRuleAdded', port, protocol });
+    return true;
+  }
+
+  /** The window's "Löschen": the rule of that row removed, written into its log; false when there is none. */
+  removeFirewallRule(nodeId: Id, index: number): boolean {
+    const configuration = this.personalFirewall(nodeId);
+    const changed = configuration === undefined ? undefined : withoutRule(configuration, index);
+    if (changed === undefined) return false;
+    this.setFirewallConfiguration(nodeId, changed);
+    this.logFirewall(nodeId, { kind: 'portRuleRemoved' });
+    return true;
+  }
+
   setFirewallConfiguration(nodeId: Id, configuration: FirewallConfiguration): void {
     const configurations = new Map(this.stateValue.topologySnapshot.firewallConfigurationsByNodeId);
     configurations.set(nodeId, configuration);

packages/core/test/firewallWindow.java.json

@@ -0,0 +1,620 @@
+{
+  "steps": [
+    {
+      "step": "open",
+      "traffic": {
+        "local": {
+          "ping": "ICMP 0/0 from 10.0.0.10",
+          "tcp": "TimeOutException: Zeitüberschreitung beim Verbindungsaufbau",
+          "dns": "TimeOutException"
+        },
+        "remote": {
+          "ping": "ICMP 0/0 from 10.0.0.10",
+          "tcp": "TimeOutException: Zeitüberschreitung beim Verbindungsaufbau",
+          "dns": "TimeOutException"
+        }
+      },
+      "active": {
+        "selected": true,
+        "enabled": true
+      },
+      "icmp": {
+        "selected": true,
+        "enabled": true
+      },
+      "udp": {
+        "selected": true,
+        "enabled": true
+      },
+      "port": "",
+      "protocol": "TCP",
+      "sender": "Alle Absender",
+      "rows": [],
+      "log": "",
+      "logEditable": true
+    },
+    {
+      "step": "add port abc",
+      "active": {
+        "selected": true,
+        "enabled": true
+      },
+      "icmp": {
+        "selected": true,
+        "enabled": true
+      },
+      "udp": {
+        "selected": true,
+        "enabled": true
+      },
+      "port": "abc",
+      "protocol": "TCP",
+      "sender": "Alle Absender",
+      "rows": [],
+      "log": "",
+      "logEditable": true
+    },
+    {
+      "step": "add an empty port",
+      "active": {
+        "selected": true,
+        "enabled": true
+      },
+      "icmp": {
+        "selected": true,
+        "enabled": true
+      },
+      "udp": {
+        "selected": true,
+        "enabled": true
+      },
+      "port": "",
+      "protocol": "TCP",
+      "sender": "Alle Absender",
+      "rows": [],
+      "log": "",
+      "logEditable": true
+    },
+    {
+      "step": "add 55555 TCP for all senders",
+      "traffic": {
+        "local": {
+          "ping": "ICMP 0/0 from 10.0.0.10",
+          "tcp": "connected",
+          "dns": "TimeOutException"
+        },
+        "remote": {
+          "ping": "ICMP 0/0 from 10.0.0.10",
+          "tcp": "connected",
+          "dns": "TimeOutException"
+        }
+      },
+      "active": {
+        "selected": true,
+        "enabled": true
+      },
+      "icmp": {
+        "selected": true,
+        "enabled": true
+      },
+      "udp": {
+        "selected": true,
+        "enabled": true
+      },
+      "port": "",
+      "protocol": "TCP",
+      "sender": "Alle Absender",
+      "rows": [
+        [
+          "TCP",
+          "55555",
+          "Alle Absender"
+        ]
+      ],
+      "log": "Portregel wurde hinzugefügt: 55555/TCP\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\n",
+      "logEditable": true
+    },
+    {
+      "step": "add 53 UDP for the same network",
+      "traffic": {
+        "local": {
+          "ping": "ICMP 0/0 from 10.0.0.10",
+          "tcp": "connected",
+          "dns": "10.0.0.10"
+        },
+        "remote": {
+          "ping": "ICMP 0/0 from 10.0.0.10",
+          "tcp": "connected",
+          "dns": "TimeOutException"
+        }
+      },
+      "active": {
+        "selected": true,
+        "enabled": true
+      },
+      "icmp": {
+        "selected": true,
+        "enabled": true
+      },
+      "udp": {
+        "selected": true,
+        "enabled": true
+      },
+      "port": "",
+      "protocol": "UDP",
+      "sender": "Absender im gleichen Rechnernetz",
+      "rows": [
+        [
+          "TCP",
+          "55555",
+          "Alle Absender"
+        ],
+        [
+          "UDP",
+          "53",
+          "Nur lokales Rechnernetz"
+        ]
+      ],
+      "log": "Portregel wurde hinzugefügt: 55555/TCP\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nPortregel wurde hinzugefügt: 53/UDP\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #2 (10.0.0.0/255.255.255.0 -> */*; UDP:53  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\n",
+      "logEditable": true
+    },
+    {
+      "step": "ICMP no longer allowed",
+      "traffic": {
+        "local": {
+          "ping": "null",
+          "tcp": "connected",
+          "dns": "10.0.0.10"
+        },
+        "remote": {
+          "ping": "null",
+          "tcp": "connected",
+          "dns": "TimeOutException"
+        }
+      },
+      "active": {
+        "selected": true,
+        "enabled": true
+      },
+      "icmp": {
+        "selected": false,
+        "enabled": true
+      },
+      "udp": {
+        "selected": true,
+        "enabled": true
+      },
+      "port": "",
+      "protocol": "UDP",
+      "sender": "Absender im gleichen Rechnernetz",
+      "rows": [
+        [
+          "TCP",
+          "55555",
+          "Alle Absender"
+        ],
+        [
+          "UDP",
+          "53",
+          "Nur lokales Rechnernetz"
+        ]
+      ],
+      "log": "Portregel wurde hinzugefügt: 55555/TCP\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nPortregel wurde hinzugefügt: 53/UDP\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #2 (10.0.0.0/255.255.255.0 -> */*; UDP:53  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 10.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #2 (10.0.0.0/255.255.255.0 -> */*; UDP:53  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 20.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\n",
+      "logEditable": true
+    },
+    {
+      "step": "UDP filter off",
+      "traffic": {
+        "local": {
+          "ping": "null",
+          "tcp": "connected",
+          "dns": "10.0.0.10"
+        },
+        "remote": {
+          "ping": "null",
+          "tcp": "connected",
+          "dns": "10.0.0.10"
+        }
+      },
+      "active": {
+        "selected": true,
+        "enabled": true
+      },
+      "icmp": {
+        "selected": false,
+        "enabled": true
+      },
+      "udp": {
+        "selected": false,
+        "enabled": true
+      },
+      "port": "",
+      "protocol": "UDP",
+      "sender": "Absender im gleichen Rechnernetz",
+      "rows": [
+        [
+          "TCP",
+          "55555",
+          "Alle Absender"
+        ],
+        [
+          "UDP",
+          "53",
+          "Nur lokales Rechnernetz"
+        ]
+      ],
+      "log": "Portregel wurde hinzugefügt: 55555/TCP\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nPortregel wurde hinzugefügt: 53/UDP\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #2 (10.0.0.0/255.255.255.0 -> */*; UDP:53  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 10.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #2 (10.0.0.0/255.255.255.0 -> */*; UDP:53  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 20.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 10.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 20.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\n",
+      "logEditable": true
+    },
+    {
+      "step": "add -1 for all protocols",
+      "active": {
+        "selected": true,
+        "enabled": true
+      },
+      "icmp": {
+        "selected": false,
+        "enabled": true
+      },
+      "udp": {
+        "selected": false,
+        "enabled": true
+      },
+      "port": "",
+      "protocol": "*",
+      "sender": "Alle Absender",
+      "rows": [
+        [
+          "TCP",
+          "55555",
+          "Alle Absender"
+        ],
+        [
+          "UDP",
+          "53",
+          "Nur lokales Rechnernetz"
+        ],
+        [
+          "*",
+          "",
+          "Alle Absender"
+        ]
+      ],
+      "log": "Portregel wurde hinzugefügt: 55555/TCP\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nPortregel wurde hinzugefügt: 53/UDP\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #2 (10.0.0.0/255.255.255.0 -> */*; UDP:53  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 10.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #2 (10.0.0.0/255.255.255.0 -> */*; UDP:53  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 20.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 10.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 20.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nPortregel wurde hinzugefügt: -1/*\n",
+      "logEditable": true
+    },
+    {
+      "step": "add 0 TCP",
+      "active": {
+        "selected": true,
+        "enabled": true
+      },
+      "icmp": {
+        "selected": false,
+        "enabled": true
+      },
+      "udp": {
+        "selected": false,
+        "enabled": true
+      },
+      "port": "",
+      "protocol": "TCP",
+      "sender": "Alle Absender",
+      "rows": [
+        [
+          "TCP",
+          "55555",
+          "Alle Absender"
+        ],
+        [
+          "UDP",
+          "53",
+          "Nur lokales Rechnernetz"
+        ],
+        [
+          "*",
+          "",
+          "Alle Absender"
+        ],
+        [
+          "TCP",
+          "0",
+          "Alle Absender"
+        ]
+      ],
+      "log": "Portregel wurde hinzugefügt: 55555/TCP\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nPortregel wurde hinzugefügt: 53/UDP\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #2 (10.0.0.0/255.255.255.0 -> */*; UDP:53  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 10.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #2 (10.0.0.0/255.255.255.0 -> */*; UDP:53  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 20.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 10.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 20.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nPortregel wurde hinzugefügt: -1/*\nPortregel wurde hinzugefügt: 0/TCP\n",
+      "logEditable": true
+    },
+    {
+      "step": "add 70000 TCP for the same network",
+      "active": {
+        "selected": true,
+        "enabled": true
+      },
+      "icmp": {
+        "selected": false,
+        "enabled": true
+      },
+      "udp": {
+        "selected": false,
+        "enabled": true
+      },
+      "port": "",
+      "protocol": "TCP",
+      "sender": "Absender im gleichen Rechnernetz",
+      "rows": [
+        [
+          "TCP",
+          "55555",
+          "Alle Absender"
+        ],
+        [
+          "UDP",
+          "53",
+          "Nur lokales Rechnernetz"
+        ],
+        [
+          "*",
+          "",
+          "Alle Absender"
+        ],
+        [
+          "TCP",
+          "0",
+          "Alle Absender"
+        ],
+        [
+          "TCP",
+          "70000",
+          "Nur lokales Rechnernetz"
+        ]
+      ],
+      "log": "Portregel wurde hinzugefügt: 55555/TCP\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nPortregel wurde hinzugefügt: 53/UDP\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #2 (10.0.0.0/255.255.255.0 -> */*; UDP:53  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 10.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #2 (10.0.0.0/255.255.255.0 -> */*; UDP:53  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 20.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 10.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 20.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nPortregel wurde hinzugefügt: -1/*\nPortregel wurde hinzugefügt: 0/TCP\nPortregel wurde hinzugefügt: 70000/TCP\n",
+      "logEditable": true
+    },
+    {
+      "step": "add a port after a space",
+      "active": {
+        "selected": true,
+        "enabled": true
+      },
+      "icmp": {
+        "selected": false,
+        "enabled": true
+      },
+      "udp": {
+        "selected": false,
+        "enabled": true
+      },
+      "port": " 80",
+      "protocol": "TCP",
+      "sender": "Alle Absender",
+      "rows": [
+        [
+          "TCP",
+          "55555",
+          "Alle Absender"
+        ],
+        [
+          "UDP",
+          "53",
+          "Nur lokales Rechnernetz"
+        ],
+        [
+          "*",
+          "",
+          "Alle Absender"
+        ],
+        [
+          "TCP",
+          "0",
+          "Alle Absender"
+        ],
+        [
+          "TCP",
+          "70000",
+          "Nur lokales Rechnernetz"
+        ]
+      ],
+      "log": "Portregel wurde hinzugefügt: 55555/TCP\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nPortregel wurde hinzugefügt: 53/UDP\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #2 (10.0.0.0/255.255.255.0 -> */*; UDP:53  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 10.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #2 (10.0.0.0/255.255.255.0 -> */*; UDP:53  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 20.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 10.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 20.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nPortregel wurde hinzugefügt: -1/*\nPortregel wurde hinzugefügt: 0/TCP\nPortregel wurde hinzugefügt: 70000/TCP\n",
+      "logEditable": true
+    },
+    {
+      "step": "delete with no row chosen",
+      "active": {
+        "selected": true,
+        "enabled": true
+      },
+      "icmp": {
+        "selected": false,
+        "enabled": true
+      },
+      "udp": {
+        "selected": false,
+        "enabled": true
+      },
+      "port": " 80",
+      "protocol": "TCP",
+      "sender": "Alle Absender",
+      "rows": [
+        [
+          "TCP",
+          "55555",
+          "Alle Absender"
+        ],
+        [
+          "UDP",
+          "53",
+          "Nur lokales Rechnernetz"
+        ],
+        [
+          "*",
+          "",
+          "Alle Absender"
+        ],
+        [
+          "TCP",
+          "0",
+          "Alle Absender"
+        ],
+        [
+          "TCP",
+          "70000",
+          "Nur lokales Rechnernetz"
+        ]
+      ],
+      "log": "Portregel wurde hinzugefügt: 55555/TCP\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nPortregel wurde hinzugefügt: 53/UDP\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #2 (10.0.0.0/255.255.255.0 -> */*; UDP:53  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 10.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #2 (10.0.0.0/255.255.255.0 -> */*; UDP:53  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 20.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 10.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 20.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nPortregel wurde hinzugefügt: -1/*\nPortregel wurde hinzugefügt: 0/TCP\nPortregel wurde hinzugefügt: 70000/TCP\n",
+      "logEditable": true
+    },
+    {
+      "step": "delete row 0",
+      "traffic": {
+        "local": {
+          "ping": "null",
+          "tcp": "connected",
+          "dns": "10.0.0.10"
+        },
+        "remote": {
+          "ping": "null",
+          "tcp": "connected",
+          "dns": "10.0.0.10"
+        }
+      },
+      "active": {
+        "selected": true,
+        "enabled": true
+      },
+      "icmp": {
+        "selected": false,
+        "enabled": true
+      },
+      "udp": {
+        "selected": false,
+        "enabled": true
+      },
+      "port": " 80",
+      "protocol": "TCP",
+      "sender": "Alle Absender",
+      "rows": [
+        [
+          "UDP",
+          "53",
+          "Nur lokales Rechnernetz"
+        ],
+        [
+          "*",
+          "",
+          "Alle Absender"
+        ],
+        [
+          "TCP",
+          "0",
+          "Alle Absender"
+        ],
+        [
+          "TCP",
+          "70000",
+          "Nur lokales Rechnernetz"
+        ]
+      ],
+      "log": "Portregel wurde hinzugefügt: 55555/TCP\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nPortregel wurde hinzugefügt: 53/UDP\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #2 (10.0.0.0/255.255.255.0 -> */*; UDP:53  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 10.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #2 (10.0.0.0/255.255.255.0 -> */*; UDP:53  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 20.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 10.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 20.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nPortregel wurde hinzugefügt: -1/*\nPortregel wurde hinzugefügt: 0/TCP\nPortregel wurde hinzugefügt: 70000/TCP\nPortregel wurde entfernt.\nICMP-Paket verworfen: 10.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #2 (*/* -> */*; *:*  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 20.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #2 (*/* -> */*; *:*  => ACCEPT)  -> akzeptieren\n",
+      "logEditable": true
+    },
+    {
+      "step": "firewall off",
+      "traffic": {
+        "local": {
+          "ping": "ICMP 0/0 from 10.0.0.10",
+          "tcp": "connected",
+          "dns": "10.0.0.10"
+        },
+        "remote": {
+          "ping": "ICMP 0/0 from 10.0.0.10",
+          "tcp": "connected",
+          "dns": "10.0.0.10"
+        }
+      },
+      "active": {
+        "selected": false,
+        "enabled": true
+      },
+      "icmp": {
+        "selected": false,
+        "enabled": false
+      },
+      "udp": {
+        "selected": false,
+        "enabled": false
+      },
+      "port": " 80",
+      "protocol": "TCP",
+      "sender": "Alle Absender",
+      "rows": [
+        [
+          "UDP",
+          "53",
+          "Nur lokales Rechnernetz"
+        ],
+        [
+          "*",
+          "",
+          "Alle Absender"
+        ],
+        [
+          "TCP",
+          "0",
+          "Alle Absender"
+        ],
+        [
+          "TCP",
+          "70000",
+          "Nur lokales Rechnernetz"
+        ]
+      ],
+      "log": "Portregel wurde hinzugefügt: 55555/TCP\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nPortregel wurde hinzugefügt: 53/UDP\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #2 (10.0.0.0/255.255.255.0 -> */*; UDP:53  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 10.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #2 (10.0.0.0/255.255.255.0 -> */*; UDP:53  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 20.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 10.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 20.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nPortregel wurde hinzugefügt: -1/*\nPortregel wurde hinzugefügt: 0/TCP\nPortregel wurde hinzugefügt: 70000/TCP\nPortregel wurde entfernt.\nICMP-Paket verworfen: 10.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #2 (*/* -> */*; *:*  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 20.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #2 (*/* -> */*; *:*  => ACCEPT)  -> akzeptieren\n",
+      "logEditable": true
+    },
+    {
+      "step": "firewall on again",
+      "active": {
+        "selected": true,
+        "enabled": true
+      },
+      "icmp": {
+        "selected": false,
+        "enabled": true
+      },
+      "udp": {
+        "selected": false,
+        "enabled": true
+      },
+      "port": " 80",
+      "protocol": "TCP",
+      "sender": "Alle Absender",
+      "rows": [
+        [
+          "UDP",
+          "53",
+          "Nur lokales Rechnernetz"
+        ],
+        [
+          "*",
+          "",
+          "Alle Absender"
+        ],
+        [
+          "TCP",
+          "0",
+          "Alle Absender"
+        ],
+        [
+          "TCP",
+          "70000",
+          "Nur lokales Rechnernetz"
+        ]
+      ],
+      "log": "Portregel wurde hinzugefügt: 55555/TCP\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nPortregel wurde hinzugefügt: 53/UDP\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #2 (10.0.0.0/255.255.255.0 -> */*; UDP:53  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 10.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nFirewall-Regel hat gegriffen: #2 (10.0.0.0/255.255.255.0 -> */*; UDP:53  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 20.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 10.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 20.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #1 (*/* -> */*; TCP:55555  => ACCEPT)  -> akzeptieren\nPortregel wurde hinzugefügt: -1/*\nPortregel wurde hinzugefügt: 0/TCP\nPortregel wurde hinzugefügt: 70000/TCP\nPortregel wurde entfernt.\nICMP-Paket verworfen: 10.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #2 (*/* -> */*; *:*  => ACCEPT)  -> akzeptieren\nICMP-Paket verworfen: 20.0.0.2 -> 10.0.0.10 (code: 0, type: 8)\nFirewall-Regel hat gegriffen: #2 (*/* -> */*; *:*  => ACCEPT)  -> akzeptieren\n",
+      "logEditable": true
+    }
+  ]
+}

packages/core/test/firewallWindow.test.ts

@@ -0,0 +1,238 @@
+// A computer's firewall as Java's window changes it, against Java's
+// (firewallWindow.java.json, FirewallWindowRun) on firewall-pc's server:
+// Java's steps played on the engine — the boxes, the rules as the window's
+// table shows them, the log, and after the steps that ask, what reaches the
+// server from a computer of its network and one behind the router (a ping,
+// a TCP connection to its echo server, its DNS server asked) — and where
+// Java errs, what the firewall does instead (apps/personalFirewall.ts names
+// each): only a port is taken.
+
+import { readFileSync } from 'node:fs';
+import { dirname, join } from 'node:path';
+import { fileURLToPath } from 'node:url';
+import { describe, expect, it } from 'vitest';
+import {
+  DIRECTLY_CONNECTED_SOURCE_MARKER,
+  firewallLogText,
+  firewallPortOfText,
+  firewallRule,
+  JAVA_PERSONAL_FIREWALL_DEFAULTS,
+  NetworkRuntimeEngine,
+  portRuleSender,
+  VirtualFileSystem,
+  withoutRule,
+  withPortRule,
+  withSnapshot,
+  type FirewallRule,
+  type PortRuleProtocol,
+  type Steps,
+} from '../src/index.js';
+import { snapshotOf, type Scenario } from './scenario.js';
+
+interface Reached {
+  readonly ping: string;
+  readonly tcp: string;
+  readonly dns: string;
+}
+
+interface JavaStep {
+  readonly step: string;
+  readonly traffic?: { readonly local: Reached; readonly remote: Reached };
+  readonly active: { readonly selected: boolean; readonly enabled: boolean };
+  readonly icmp: { readonly selected: boolean; readonly enabled: boolean };
+  readonly udp: { readonly selected: boolean; readonly enabled: boolean };
+  readonly rows: readonly (readonly string[])[];
+  readonly log: string;
+  readonly logEditable: boolean;
+}
+
+const here = dirname(fileURLToPath(import.meta.url));
+const java = JSON.parse(readFileSync(join(here, 'firewallWindow.java.json'), 'utf8')) as { readonly steps: readonly JavaStep[] };
+const scenario = JSON.parse(readFileSync(join(here, 'scenarios/firewall-pc.scenario.json'), 'utf8')) as Scenario;
+const LOCAL = '00000000-0000-0000-0000-000000000201';
+const REMOTE = '00000000-0000-0000-0000-000000000203';
+const SERVER = '00000000-0000-0000-0000-000000000204';
+const SERVER_ADDRESS = '10.0.0.10';
+const TIMED_OUT = 'TimeOutException: Zeitüberschreitung beim Verbindungsaufbau';
+
+/** Java's ruleToVector: protocol, port, sender. */
+function javaRow(rule: FirewallRule): string[] {
+  const protocol = rule.protocol === 'tcp' ? 'TCP' : rule.protocol === 'udp' ? 'UDP' : '*';
+  return [protocol, rule.port >= 0 ? String(rule.port) : '', rule.sourceIPAddress === DIRECTLY_CONNECTED_SOURCE_MARKER ? 'Nur lokales Rechnernetz' : 'Alle Absender'];
+}
+
+function setUp() {
+  const engine = new NetworkRuntimeEngine(scenario.seed);
+  engine.handle({
+    type: 'start',
+    snapshot: withSnapshot(snapshotOf(scenario), {
+      fileSystemsByNodeId: new Map([[SERVER, new VirtualFileSystem()]]),
+      echoServersByNodeId: new Map([[SERVER, { port: 55555, isActive: true }]]),
+      firewallConfigurationsByNodeId: new Map([[SERVER, JAVA_PERSONAL_FIREWALL_DEFAULTS]]),
+    }),
+    seed: scenario.seed,
+    initialTimeMilliseconds: 0,
+  });
+  const run = (milliseconds: number) => engine.handle({ type: 'advance', toMilliseconds: engine.state.currentTimeMilliseconds + milliseconds });
+  const blocking = <T>(steps: Steps<T>, milliseconds: number): T | undefined => {
+    let result: T | undefined;
+    engine.startThread(
+      (function* (): Steps {
+        result = yield* steps;
+      })(),
+    );
+    run(milliseconds);
+    return result;
+  };
+  let sequenceNumber = 1;
+  const reached = (from: string): Reached => {
+    const answer = blocking(engine.icmpEchoSteps(from, SERVER_ADDRESS, { identifier: 1, sequenceNumber: sequenceNumber++ }), 30_000);
+    const ping = answer?.message.kind === 'echoReply' ? `ICMP 0/0 from ${answer.packet.senderIPAddress}` : 'null';
+    const socket = engine.openTcpClientSocket(from, SERVER_ADDRESS, 55555)!;
+    const connected = blocking(engine.connectTcpSteps(socket), 60_000);
+    // Held a moment, as the oracle holds it.
+    run(500);
+    engine.closeSocket(socket);
+    run(1000);
+    const tcp = connected === 'connected' ? 'connected' : connected === 'timedOut' ? TIMED_OUT : String(connected);
+    const resolution = blocking(engine.resolveDnsAddressSteps(from, 'www.filius.de'), 30_000);
+    const dns = resolution === undefined || resolution.type === 'timedOut' ? 'TimeOutException' : String(resolution.address ?? null);
+    return { ping, tcp, dns };
+  };
+  return { engine, reached };
+}
+
+describe("a computer's firewall window, against Java's", () => {
+  it("plays Java's steps: the same where Java is right, as named where it errs", () => {
+    const { engine, reached } = setUp();
+    const configuration = () => engine.personalFirewall(SERVER)!;
+    const log = () => engine.firewallLog(SERVER).map((entry) => `${firewallLogText(entry, 'de')}\n`);
+    // Java's log lines, less those of what Java takes and the firewall does not (and with those the firewall takes instead).
+    let javaLines = (step: JavaStep) => step.log.split(/(?<=\n)/).filter((line) => line !== '');
+    const at = (name: string) => java.steps.find((step) => step.step === name)!;
+    const check = (name: string, traffic: { readonly local: Reached; readonly remote: Reached } | undefined = at(name).traffic) => {
+      const step = at(name);
+      if (traffic !== undefined) expect({ local: reached(LOCAL), remote: reached(REMOTE) }, name).toEqual(traffic);
+      expect({ active: configuration().isActive, icmp: !configuration().dropIcmp, udp: configuration().filterUdp, rows: configuration().rules.map(javaRow), log: log() }, name).toEqual({
+        active: step.active.selected,
+        icmp: step.icmp.selected,
+        udp: step.udp.selected,
+        rows: step.rows,
+        log: javaLines(step),
+      });
+    };
+    const add = (port: string, protocol: PortRuleProtocol, sameNetworkOnly: boolean) => {
+      const number = firewallPortOfText(port);
+      return number !== undefined && engine.addFirewallPortRule(SERVER, number, protocol, sameNetworkOnly);
+    };
+    const set = (fields: Partial<ReturnType<typeof configuration>>) => engine.setFirewallConfiguration(SERVER, { ...configuration(), ...fields });
+
+    // Active as Java installs it: a ping goes through, TCP and UDP only by a rule.
+    check('open');
+    expect(at('open').logEditable).toBe(true);
+    expect([add('abc', 'tcp', false), add('', 'tcp', false)]).toEqual([false, false]);
+    check('add port abc');
+    check('add an empty port');
+
+    expect(add('55555', 'tcp', false)).toBe(true);
+    check('add 55555 TCP for all senders');
+    expect(add('53', 'udp', true)).toBe(true);
+    check('add 53 UDP for the same network');
+    set({ dropIcmp: true });
+    check('ICMP no longer allowed');
+    set({ filterUdp: false });
+    check('UDP filter off');
+
+    // No port, none taken (Java takes each: -1 a rule for every port of both protocols, 0 and 70000 rules that never match).
+    expect([add('-1', 'all', false), add('0', 'tcp', false), add('70000', 'tcp', true)]).toEqual([false, false, false]);
+    const notTaken = ['Portregel wurde hinzugefügt: -1/*\n', 'Portregel wurde hinzugefügt: 0/TCP\n', 'Portregel wurde hinzugefügt: 70000/TCP\n'];
+    let javaRows = (step: JavaStep) => step.rows.filter(([, port]) => port !== '' && port !== '0' && port !== '70000');
+    const javaAll = javaLines;
+    javaLines = (step) => javaAll(step).filter((line) => !notTaken.includes(line));
+    const sameAsJava = (name: string) => expect({ rows: configuration().rules.map(javaRow), log: log() }, name).toEqual({ rows: javaRows(at(name)), log: javaLines(at(name)) });
+    for (const name of ['add -1 for all protocols', 'add 0 TCP', 'add 70000 TCP for the same network']) sameAsJava(name);
+    // A port after a space is taken (Java refuses it without a word).
+    expect(add(' 80', 'tcp', false)).toBe(true);
+    const tookPort = javaLines(at('add 70000 TCP for the same network')).length;
+    const javaTaken = javaLines;
+    javaLines = (step) => javaTaken(step).toSpliced(tookPort, 0, 'Portregel wurde hinzugefügt: 80/TCP\n');
+    const javaListed = javaRows;
+    javaRows = (step) => [...javaListed(step), ['TCP', '80', 'Alle Absender']];
+    sameAsJava('add a port after a space');
+
+    // "Löschen" with no row chosen does nothing; row 0 goes. Without Java's rule for every port, TCP is no longer let through.
+    sameAsJava('delete with no row chosen');
+    expect(engine.removeFirewallRule(SERVER, 0)).toBe(true);
+    const javaKept = javaLines;
+    javaLines = (step) => javaKept(step).filter((line) => !line.includes('*/* -> */*; *:*'));
+    const javaDelete = at('delete row 0');
+    const closed = (reach: Reached): Reached => ({ ...reach, tcp: TIMED_OUT });
+    expect({ local: reached(LOCAL), remote: reached(REMOTE) }).toEqual({ local: closed(javaDelete.traffic!.local), remote: closed(javaDelete.traffic!.remote) });
+    sameAsJava('delete row 0');
+
+    // Off: everything goes through, nothing is written; on again.
+    set({ isActive: false });
+    const javaOff = at('firewall off');
+    expect({ local: reached(LOCAL), remote: reached(REMOTE) }).toEqual(javaOff.traffic);
+    sameAsJava('firewall off');
+    expect([javaOff.icmp.enabled, javaOff.udp.enabled, at('firewall on again').icmp.enabled]).toEqual([false, false, true]);
+    set({ isActive: true });
+    expect(configuration()).toMatchObject({ isActive: true, dropIcmp: true, filterUdp: false });
+  });
+});
+
+describe("a computer's firewall beyond the steps", () => {
+  it('takes a port of 1 to 65535 only, spaces around it allowed', () => {
+    expect(['1', '65535', ' 80 ', '+80', '80a', '0', '65536', '-1', '', ' '].map(firewallPortOfText)).toEqual([
+      1,
+      65535,
+      80,
+      undefined,
+      undefined,
+      undefined,
+      undefined,
+      undefined,
+      undefined,
+      undefined,
+    ]);
+  });
+
+  it('adds Java’s rule and removes the row chosen only', () => {
+    const added = withPortRule(withPortRule(JAVA_PERSONAL_FIREWALL_DEFAULTS, 80, 'tcp', false), 53, 'udp', true);
+    expect(added.rules).toEqual([
+      firewallRule({ port: 80, protocol: 'tcp', action: 'accept' }),
+      firewallRule({ port: 53, protocol: 'udp', action: 'accept', sourceIPAddress: DIRECTLY_CONNECTED_SOURCE_MARKER }),
+    ]);
+    expect(withoutRule(added, 1)!.rules).toEqual([added.rules[0]]);
+    expect([withoutRule(added, 2), withoutRule(added, -1), withoutRule(added, 0.5)]).toEqual([undefined, undefined, undefined]);
+  });
+
+  it("names the window's sender for the rules it makes only", () => {
+    expect(
+      [
+        firewallRule({ action: 'accept' }),
+        firewallRule({ action: 'accept', sourceIPAddress: DIRECTLY_CONNECTED_SOURCE_MARKER, sourceSubnetMask: '255.0.0.0' }),
+        firewallRule({ action: 'accept', sourceSubnetMask: '255.0.0.0' }),
+        firewallRule({ action: 'drop' }),
+        firewallRule({ action: 'accept', sourceIPAddress: '10.0.0.0', sourceSubnetMask: '255.0.0.0' }),
+        firewallRule({ action: 'accept', destinationIPAddress: '10.0.0.10' }),
+      ].map(portRuleSender),
+    ).toEqual(['all', 'sameNetwork', 'all', undefined, undefined, undefined]);
+  });
+
+  it('has nothing for a computer without a firewall, nor a router', () => {
+    const engine = new NetworkRuntimeEngine(scenario.seed);
+    // The router has a firewall, as every one has in Java; it is no program of a computer.
+    const ROUTER = '00000000-0000-0000-0000-000000000202';
+    engine.handle({
+      type: 'start',
+      snapshot: withSnapshot(snapshotOf(scenario), { firewallConfigurationsByNodeId: new Map([[ROUTER, JAVA_PERSONAL_FIREWALL_DEFAULTS]]) }),
+      seed: scenario.seed,
+      initialTimeMilliseconds: 0,
+    });
+    expect([engine.personalFirewall(SERVER), engine.personalFirewall(ROUTER)]).toEqual([undefined, undefined]);
+    expect(engine.addFirewallPortRule(ROUTER, 80, 'tcp', false)).toBe(false);
+    expect([engine.addFirewallPortRule(SERVER, 80, 'tcp', false), engine.removeFirewallRule(SERVER, 0)]).toEqual([false, false]);
+    expect(engine.firewallLog(SERVER)).toEqual([]);
+  });
+});

packages/core/test/scenarios/firewall-pc.scenario.json

@@ -0,0 +1,146 @@
+{
+  "seed": 21,
+  "nodes": [
+    {
+      "id": "00000000-0000-0000-0000-000000000201",
+      "kind": "pc",
+      "ports": [
+        {
+          "id": "00000000-0000-0000-0000-000000000211",
+          "label": "eth0"
+        }
+      ]
+    },
+    {
+      "id": "00000000-0000-0000-0000-000000000202",
+      "kind": "router",
+      "ports": [
+        {
+          "id": "00000000-0000-0000-0000-000000000221",
+          "label": "rt1"
+        },
+        {
+          "id": "00000000-0000-0000-0000-000000000222",
+          "label": "rt2"
+        }
+      ]
+    },
+    {
+      "id": "00000000-0000-0000-0000-000000000203",
+      "kind": "pc",
+      "ports": [
+        {
+          "id": "00000000-0000-0000-0000-000000000213",
+          "label": "eth0"
+        }
+      ]
+    },
+    {
+      "id": "00000000-0000-0000-0000-000000000204",
+      "kind": "pc",
+      "ports": [
+        {
+          "id": "00000000-0000-0000-0000-000000000214",
+          "label": "eth0"
+        }
+      ]
+    },
+    {
+      "id": "00000000-0000-0000-0000-000000000205",
+      "kind": "networkSwitch",
+      "ports": [
+        {
+          "id": "00000000-0000-0000-0000-000000000251",
+          "label": "sw1"
+        },
+        {
+          "id": "00000000-0000-0000-0000-000000000252",
+          "label": "sw2"
+        },
+        {
+          "id": "00000000-0000-0000-0000-000000000253",
+          "label": "sw3"
+        },
+        {
+          "id": "00000000-0000-0000-0000-000000000254",
+          "label": "sw4"
+        }
+      ]
+    }
+  ],
+  "links": [
+    {
+      "id": "00000000-0000-0000-0000-00000000F301",
+      "sourceNode": "00000000-0000-0000-0000-000000000201",
+      "sourcePort": "00000000-0000-0000-0000-000000000211",
+      "targetNode": "00000000-0000-0000-0000-000000000205",
+      "targetPort": "00000000-0000-0000-0000-000000000251"
+    },
+    {
+      "id": "00000000-0000-0000-0000-00000000F302",
+      "sourceNode": "00000000-0000-0000-0000-000000000204",
+      "sourcePort": "00000000-0000-0000-0000-000000000214",
+      "targetNode": "00000000-0000-0000-0000-000000000205",
+      "targetPort": "00000000-0000-0000-0000-000000000252"
+    },
+    {
+      "id": "00000000-0000-0000-0000-00000000F303",
+      "sourceNode": "00000000-0000-0000-0000-000000000202",
+      "sourcePort": "00000000-0000-0000-0000-000000000221",
+      "targetNode": "00000000-0000-0000-0000-000000000205",
+      "targetPort": "00000000-0000-0000-0000-000000000253"
+    },
+    {
+      "id": "00000000-0000-0000-0000-00000000F304",
+      "sourceNode": "00000000-0000-0000-0000-000000000202",
+      "sourcePort": "00000000-0000-0000-0000-000000000222",
+      "targetNode": "00000000-0000-0000-0000-000000000203",
+      "targetPort": "00000000-0000-0000-0000-000000000213"
+    }
+  ],
+  "devices": {
+    "00000000-0000-0000-0000-000000000201": {
+      "ip": "10.0.0.2",
+      "mask": "255.255.255.0",
+      "gateway": "10.0.0.1",
+      "dns": "10.0.0.10"
+    },
+    "00000000-0000-0000-0000-000000000202": {
+      "ip": "10.0.0.1",
+      "mask": "255.255.255.0"
+    },
+    "00000000-0000-0000-0000-000000000203": {
+      "ip": "20.0.0.2",
+      "mask": "255.255.255.0",
+      "gateway": "20.0.0.1",
+      "dns": "10.0.0.10"
+    },
+    "00000000-0000-0000-0000-000000000204": {
+      "ip": "10.0.0.10",
+      "mask": "255.255.255.0",
+      "gateway": "10.0.0.1"
+    }
+  },
+  "interfaces": [
+    {
+      "node": "00000000-0000-0000-0000-000000000202",
+      "port": "00000000-0000-0000-0000-000000000221",
+      "ip": "10.0.0.1",
+      "mask": "255.255.255.0"
+    },
+    {
+      "node": "00000000-0000-0000-0000-000000000202",
+      "port": "00000000-0000-0000-0000-000000000222",
+      "ip": "20.0.0.1",
+      "mask": "255.255.255.0"
+    }
+  ],
+  "dnsServers": {
+    "00000000-0000-0000-0000-000000000204": {
+      "records": [
+        "www.filius.de A 10.0.0.10"
+      ]
+    }
+  }
+  ,"steps": []
+}