From 46a66771c0e53607e4c4936487c43b1c538b3cce Mon Sep 17 00:00:00 2001
From: ssrlive <30760636+ssrlive@users.noreply.github.com>
Date: Wed, 6 Dec 2023 21:03:26 +0800
Subject: [PATCH] add apply_settings switch for Linux configutation

---
 README.md                    |  1 +
 examples/ping-tun.rs         |  1 +
 examples/read-async.rs       |  1 +
 examples/read.rs             |  1 +
 src/platform/linux/device.rs |  4 +++-
 src/platform/linux/mod.rs    | 18 +++++++++++++++++-
 6 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 7c468188..834d2f15 100644
--- a/README.md
+++ b/README.md
@@ -43,6 +43,7 @@ fn main() {
 	#[cfg(target_os = "linux")]
 	config.platform(|config| {
 		config.packet_information(true);
+        config.apply_settings(true);
 	});
 
 	let mut dev = tun::create(&config).unwrap();
diff --git a/examples/ping-tun.rs b/examples/ping-tun.rs
index ce914941..1d56502e 100644
--- a/examples/ping-tun.rs
+++ b/examples/ping-tun.rs
@@ -29,6 +29,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
     #[cfg(target_os = "linux")]
     config.platform(|config| {
         config.packet_information(true);
+        config.apply_settings(true);
     });
 
     #[cfg(target_os = "windows")]
diff --git a/examples/read-async.rs b/examples/read-async.rs
index 9fe9def6..a026ef31 100644
--- a/examples/read-async.rs
+++ b/examples/read-async.rs
@@ -27,6 +27,7 @@ async fn main() {
     #[cfg(target_os = "linux")]
     config.platform(|config| {
         config.packet_information(true);
+        config.apply_settings(true);
     });
 
     let dev = tun::create_as_async(&config).unwrap();
diff --git a/examples/read.rs b/examples/read.rs
index 5beda850..c534ba6f 100644
--- a/examples/read.rs
+++ b/examples/read.rs
@@ -26,6 +26,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     #[cfg(target_os = "linux")]
     config.platform(|config| {
         config.packet_information(true);
+        config.apply_settings(true);
     });
 
     let mut dev = tun::create(&config)?;
diff --git a/src/platform/linux/device.rs b/src/platform/linux/device.rs
index 41ce0958..1655a5be 100644
--- a/src/platform/linux/device.rs
+++ b/src/platform/linux/device.rs
@@ -108,7 +108,9 @@ impl Device {
             Device { name, queues, ctl }
         };
 
-        device.configure(config)?;
+        if config.platform.apply_settings {
+            device.configure(config)?;
+        }
 
         Ok(device)
     }
diff --git a/src/platform/linux/mod.rs b/src/platform/linux/mod.rs
index 455a2791..20003113 100644
--- a/src/platform/linux/mod.rs
+++ b/src/platform/linux/mod.rs
@@ -23,9 +23,19 @@ use crate::configuration::Configuration as C;
 use crate::error::*;
 
 /// Linux-only interface configuration.
-#[derive(Copy, Clone, Default, Debug)]
+#[derive(Copy, Clone, Debug)]
 pub struct Configuration {
     pub(crate) packet_information: bool,
+    pub(crate) apply_settings: bool,
+}
+
+impl Default for Configuration {
+    fn default() -> Self {
+        Configuration {
+            packet_information: false,
+            apply_settings: true,
+        }
+    }
 }
 
 impl Configuration {
@@ -35,6 +45,12 @@ impl Configuration {
         self.packet_information = value;
         self
     }
+
+    /// Enable or disable to assign IP/netmask/destination etc.
+    pub fn apply_settings(&mut self, value: bool) -> &mut Self {
+        self.apply_settings = value;
+        self
+    }
 }
 
 /// Create a TUN device with the given name.