fix(awg): harden AmneziaWG validation, auto-convert plaintext headers to hex, and enforce optimal MTU/keepalive defaults

tachyon/files/usr/lib/config/validator.uc

@@ -1993,6 +1993,16 @@ function validate_extended_server_features(ctx, sing_box_version, sing_box_versi
         if (transport == "xhttp" && !sing_box_supports_xhttp(ctx, sing_box_version, sing_box_version_output))
             fail_requirement("Server '" + name + "' uses XHTTP transport, but the installed sing-box binary does not support it. Install sing-box-extended or a binary with XHTTP support, or change the transport. Aborted.", "fatal");
     }
+
+    for (let section in sections_by_type("section")) {
+        if (!section_enabled(section))
+            continue;
+
+        let name = section_name(section);
+        let action = rule_action(section);
+        if (action == "awg" && !sing_box_is_extended(ctx, sing_box_version) && !sing_box_is_lx(ctx, sing_box_version))
+            fail_requirement("Section '" + name + "' uses AmneziaWG, but the installed sing-box binary does not support it. Install sing-box-extended or sing-box-lx, or change the action. Aborted.", "fatal");
+    }
 }
 
 function has_outbound_section(ctx) {

tachyon/files/usr/lib/singbox/generator.uc

@@ -59,7 +59,18 @@ function uci_bin_to_hex(val) {
     s = replace(s, /^0x/i, "");
     s = replace(s, />$/, "");
     s = replace(s, /\s+/g, "");
-    return s;
+
+    if (match(s, /^[0-9a-fA-F]+$/)) {
+        if (length(s) % 2 != 0) s = "0" + s;
+        return lc(s);
+    }
+
+    let hex = "";
+    for (let i = 0; i < length(val); i++) {
+        let code = ord(val, i);
+        hex += sprintf("%02x", code);
+    }
+    return hex;
 }
 
 let generator_outbounds = require("singbox.generator_outbounds");

tachyon/files/usr/lib/singbox/generator_outbounds.uc

@@ -58,7 +58,18 @@ function uci_bin_to_hex(val) {
     s = replace(s, /^0x/i, "");
     s = replace(s, />$/, "");
     s = replace(s, /\s+/g, "");
-    return s;
+
+    if (match(s, /^[0-9a-fA-F]+$/)) {
+        if (length(s) % 2 != 0) s = "0" + s;
+        return lc(s);
+    }
+
+    let hex = "";
+    for (let i = 0; i < length(val); i++) {
+        let code = ord(val, i);
+        hex += sprintf("%02x", code);
+    }
+    return hex;
 }
 
 function internal_flag(value) {
@@ -1164,19 +1175,25 @@ function add_awg_endpoint(config, section) {
     if (preshared_key != "")
         endpoint.peers[0].pre_shared_key = preshared_key;
 
-    let mtu = int_option(section, "awg_mtu", "0");
-    if (mtu > 0)
-        endpoint.mtu = mtu;
+    let mtu = int_option(section, "awg_mtu", "1280");
+    endpoint.mtu = mtu > 0 ? mtu : 1280;
 
-    let keepalive = int_option(section, "awg_keepalive", "0");
-    if (keepalive > 0)
-        endpoint.peers[0].persistent_keepalive_interval = keepalive;
+    let keepalive = int_option(section, "awg_keepalive", "25");
+    endpoint.peers[0].persistent_keepalive_interval = keepalive > 0 ? keepalive : 25;
+
+    let jc = int_option(section, "awg_jc", "4");
+    if (jc > 10) jc = 10;
+
+    let jmin = int_option(section, "awg_jmin", "40");
+
+    let jmax = int_option(section, "awg_jmax", "70");
+    if (jmax > 1200) jmax = 1200;
 
     // AmneziaWG obfuscation parameters
     let amnezia = {
-        jc: int_option(section, "awg_jc", "120"),
-        jmin: int_option(section, "awg_jmin", "23"),
-        jmax: int_option(section, "awg_jmax", "911"),
+        jc: jc,
+        jmin: jmin,
+        jmax: jmax,
         s1: int_option(section, "awg_s1", "0"),
         s2: int_option(section, "awg_s2", "0"),
         h1: int_option(section, "awg_h1", "1"),