From 352f322f6108105fbdb33d607f6e858e7c3f66d8 Mon Sep 17 00:00:00 2001
From: lbl8603 <49143209+lbl8603@users.noreply.github.com>
Date: Wed, 24 Jul 2024 22:11:50 +0800
Subject: [PATCH] =?UTF-8?q?=E7=94=9F=E6=88=90guid?=
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---
 Cargo.lock                     |  1 +
 vnt/tun/Cargo.toml             |  1 +
 vnt/tun/src/windows/tun/mod.rs | 15 ++++++++++-----
 3 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index c9e5943..10045db 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1968,6 +1968,7 @@ dependencies = [
  "libloading",
  "log",
  "rand",
+ "sha2",
  "widestring",
  "winapi",
 ]
diff --git a/vnt/tun/Cargo.toml b/vnt/tun/Cargo.toml
index cdede0f..08b8d16 100644
--- a/vnt/tun/Cargo.toml
+++ b/vnt/tun/Cargo.toml
@@ -11,6 +11,7 @@ libc = "0.2.153"
 
 log = { version = "0.4.20", features = [] }
 rand = "0.8.5"
+sha2 = { version = "0.10.6", features = ["oid"] }
 
 [target.'cfg(any(target_os = "linux", target_os = "macos"))'.dependencies]
 ioctl = { version = "0.8", package = "ioctl-sys" }
diff --git a/vnt/tun/src/windows/tun/mod.rs b/vnt/tun/src/windows/tun/mod.rs
index d155c8f..8c826eb 100644
--- a/vnt/tun/src/windows/tun/mod.rs
+++ b/vnt/tun/src/windows/tun/mod.rs
@@ -1,9 +1,8 @@
 #![allow(dead_code)]
 use libloading::Library;
+use sha2::Digest;
 use std::io;
 use std::net::Ipv4Addr;
-
-use rand::Rng;
 use winapi::um::winbase;
 use winapi::um::{synchapi, winnt};
 
@@ -81,8 +80,7 @@ impl Device {
             if Self::delete_for_name(&win_tun, &name_utf16).is_ok() {
                 std::thread::sleep(std::time::Duration::from_millis(500));
             }
-            let mut guid_bytes: [u8; 16] = [0u8; 16];
-            rand::thread_rng().fill(&mut guid_bytes);
+            let guid_bytes: [u8; 16] = hash_guid(&name);
             let guid = u128::from_ne_bytes(guid_bytes);
             //SAFETY: guid is a unique integer so transmuting either all zeroes or the user's preferred
             //guid to the winapi guid type is safe and will allow the windows kernel to see our GUID
@@ -154,7 +152,14 @@ impl Device {
         Ok(())
     }
 }
-
+fn hash_guid(input: &str) -> [u8; 16] {
+    let mut hasher = sha2::Sha256::new();
+    hasher.update(b"VNT");
+    hasher.update(input.as_bytes());
+    hasher.update(b"2024");
+    let hash: [u8; 32] = hasher.finalize().into();
+    hash[..16].try_into().unwrap()
+}
 impl IFace for Device {
     fn version(&self) -> io::Result<String> {
         let version = unsafe { self.win_tun.WintunGetRunningDriverVersion() };