added automatic ipv6 ipv4 detection

default/config.yaml

@@ -7,9 +7,11 @@ cardsCacheCapacity: 100
 # Listen for incoming connections
 listen: false
 # Enables IPv6 and/or IPv4 protocols. Need to have at least one enabled!
+# - Use option "auto" to automatically detect support
+# - Use "enabled" or "disabled" to enable or disabled each protocol
 protocol:
-    ipv4: true
-    ipv6: false
+    ipv4: auto
+    ipv6: auto
 # Prefers IPv6 for DNS. Enable this on ISPs that don't have issues with IPv6
 dnsPreferIPv6: false
 # The hostname that autorun opens.

server.js

@@ -4,6 +4,7 @@
 import fs from 'node:fs';
 import http from 'node:http';
 import https from 'node:https';
+import os from 'os';
 import path from 'node:path';
 import util from 'node:util';
 import net from 'node:net';
@@ -133,8 +134,8 @@ const DEFAULT_CSRF_DISABLED = false;
 const DEFAULT_BASIC_AUTH = false;
 const DEFAULT_PER_USER_BASIC_AUTH = false;
 
-const DEFAULT_ENABLE_IPV6 = false;
-const DEFAULT_ENABLE_IPV4 = true;
+const DEFAULT_ENABLE_IPV6 = "auto";
+const DEFAULT_ENABLE_IPV4 = "auto";
 
 const DEFAULT_PREFER_IPV6 = false;
 
@@ -149,11 +150,11 @@ const DEFAULT_PROXY_BYPASS = [];
 
 const cliArguments = yargs(hideBin(process.argv))
     .usage('Usage: <your-start-script> <command> [options]')
-    .option('enableIPv6', {
+    .option('string', {
         type: 'boolean',
         default: null,
         describe: `Enables IPv6.\n[config default: ${DEFAULT_ENABLE_IPV6}]`,
-    }).option('enableIPv4', {
+    }).option('string', {
         type: 'boolean',
         default: null,
         describe: `Enables IPv4.\n[config default: ${DEFAULT_ENABLE_IPV4}]`,
@@ -280,7 +281,7 @@ if (dnsPreferIPv6) {
     console.log('Preferring IPv4 for DNS resolution');
 }
 
-if (!enableIPv6 && !enableIPv4) {
+if (enableIPv6 == "disabled" && enableIPv4 == "disabled") {
     console.error('error: You can\'t disable all internet protocols: at least IPv6 or IPv4 must be enabled.');
     process.exit(1);
 }
@@ -365,6 +366,28 @@ function getSessionCookieAge() {
     return undefined;
 }
 
+async function getHasIP() {
+    let hasIPv6 = false;
+    let hasIPv4 = false;
+    const interfaces = os.networkInterfaces();
+
+    for (const iface of Object.values(interfaces)) {
+        if (iface === undefined) {
+            continue
+        }
+        for (const info of iface) {
+            if (info.family === 'IPv6') {
+                hasIPv6 = true;
+            }
+
+            if (info.family === 'IPv4') {
+                hasIPv4 = true;
+            }
+        }
+    }
+    return [hasIPv6, hasIPv4];
+}
+
 app.use(cookieSession({
     name: getCookieSessionName(),
     sameSite: 'strict',
@@ -685,18 +708,18 @@ const preSetupTasks = async function () {
  * Gets the hostname to use for autorun in the browser.
  * @returns {string} The hostname to use for autorun
  */
-function getAutorunHostname() {
+function getAutorunHostname(useIPv6, useIPv4) {
     if (autorunHostname === 'auto') {
-        if (enableIPv6 && enableIPv4) {
+        if (useIPv6 && useIPv4) {
             if (avoidLocalhost) return '[::1]';
             return 'localhost';
         }
 
-        if (enableIPv6) {
+        if (useIPv6) {
             return '[::1]';
         }
 
-        if (enableIPv4) {
+        if (useIPv4) {
             return '127.0.0.1';
         }
     }
@@ -709,10 +732,10 @@ function getAutorunHostname() {
  * @param {boolean} v6Failed If the server failed to start on IPv6
  * @param {boolean} v4Failed If the server failed to start on IPv4
  */
-const postSetupTasks = async function (v6Failed, v4Failed) {
+const postSetupTasks = async function (v6Failed, v4Failed, useIPv6, useIPv4) {
     const autorunUrl = new URL(
         (cliArguments.ssl ? 'https://' : 'http://') +
-        (getAutorunHostname()) +
+        (getAutorunHostname(useIPv6, useIPv4)) +
         (':') +
         ((autorunPortOverride >= 0) ? autorunPortOverride : server_port),
     );
@@ -725,11 +748,11 @@ const postSetupTasks = async function (v6Failed, v4Failed) {
 
     let logListen = 'SillyTavern is listening on';
 
-    if (enableIPv6 && !v6Failed) {
+    if (useIPv6 && !v6Failed) {
         logListen += color.green(' IPv6: ' + tavernUrlV6.host);
     }
 
-    if (enableIPv4 && !v4Failed) {
+    if (useIPv4 && !v4Failed) {
         logListen += color.green(' IPv4: ' + tavernUrl.host);
     }
 
@@ -805,13 +828,13 @@ function logSecurityAlert(message) {
  * @param {boolean} v6Failed If the server failed to start on IPv6
  * @param {boolean} v4Failed If the server failed to start on IPv4
  */
-function handleServerListenFail(v6Failed, v4Failed) {
-    if (v6Failed && !enableIPv4) {
+function handleServerListenFail(v6Failed, v4Failed, useIPv6, useIPv4) {
+    if (v6Failed && !useIPv4) {
         console.error(color.red('fatal error: Failed to start server on IPv6 and IPv4 disabled'));
         process.exit(1);
     }
 
-    if (v4Failed && !enableIPv6) {
+    if (v4Failed && !useIPv6) {
         console.error(color.red('fatal error: Failed to start server on IPv4 and IPv6 disabled'));
         process.exit(1);
     }
@@ -856,13 +879,13 @@ function createHttpServer(url) {
     });
 }
 
-async function startHTTPorHTTPS() {
+async function startHTTPorHTTPS(useIPv6, useIPv4) {
     let v6Failed = false;
     let v4Failed = false;
 
     const createFunc = cliArguments.ssl ? createHttpsServer : createHttpServer;
 
-    if (enableIPv6) {
+    if (useIPv6) {
         try {
             await createFunc(tavernUrlV6);
         } catch (error) {
@@ -873,7 +896,7 @@ async function startHTTPorHTTPS() {
         }
     }
 
-    if (enableIPv4) {
+    if (useIPv4) {
         try {
             await createFunc(tavernUrl);
         } catch (error) {
@@ -888,10 +911,32 @@ async function startHTTPorHTTPS() {
 }
 
 async function startServer() {
-    const [v6Failed, v4Failed] = await startHTTPorHTTPS();
+    let useIPv6 = (enableIPv6 == "enabled")
+    let useIPv4 = (enableIPv4 == "enabled")
 
-    handleServerListenFail(v6Failed, v4Failed);
-    postSetupTasks(v6Failed, v4Failed);
+    const [hasIPv6, hasIPv4] = await getHasIP()
+    if (enableIPv6 == "auto") {
+        useIPv6 = hasIPv6;
+        if (useIPv6) {
+            console.log("IPv6 support detected")
+        }
+    }
+
+    if (enableIPv4 == "auto") {
+        useIPv4 = hasIPv4;
+        if (useIPv4) {
+            console.log("IPv4 support detected")
+        }
+    }
+
+    if (!useIPv6 && !useIPv4) {
+        console.log("No IPv6 and no IPv4 enabled")
+    }
+
+    const [v6Failed, v4Failed] = await startHTTPorHTTPS(useIPv6, useIPv4);
+
+    handleServerListenFail(v6Failed, v4Failed, useIPv6, useIPv4);
+    postSetupTasks(v6Failed, v4Failed, useIPv6, useIPv4);
 }
 
 async function verifySecuritySettings() {