From e78768abdcd98ebc730aca2279455eb5971c14ce Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hellmann=20Zolt=C3=A1n?= <hellmann.zoltan01@gmail.com>
Date: Sat, 6 Apr 2024 15:41:31 +0200
Subject: [PATCH] Added a function to determine if an interface is used for
 mobile data and prevent its address from being returned as the local ip
 address

---
 src/lib.rs  | 4 ++--
 src/unix.rs | 7 +++++++
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/lib.rs b/src/lib.rs
index 2327e20..7f071c5 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -124,7 +124,7 @@ pub fn local_ip() -> Result<IpAddr, Error> {
 
         ifas.into_iter()
             .find_map(|ifa| {
-                if !ifa.is_loopback && ifa.addr.is_ipv4() {
+                if !ifa.is_loopback && ifa.addr.is_ipv4() && !ifa.is_mobile_data() {
                     Some(ifa.addr)
                 } else {
                     None
@@ -196,7 +196,7 @@ pub fn local_ipv6() -> Result<IpAddr, Error> {
 
         ifas.into_iter()
             .find_map(|ifa| {
-                if !ifa.is_loopback && ifa.addr.is_ipv6() {
+                if !ifa.is_loopback && ifa.addr.is_ipv6() && !ifa.is_mobile_data() {
                     Some(ifa.addr)
                 } else {
                     None
diff --git a/src/unix.rs b/src/unix.rs
index 109895c..4cc72ff 100644
--- a/src/unix.rs
+++ b/src/unix.rs
@@ -45,6 +45,13 @@ pub(crate) struct AfInetInfo {
     pub is_loopback: bool,
 }
 
+impl AfInetInfo {
+    /// Determines if an interface is used for mobile_data
+    pub(crate) fn is_mobile_data(&self) -> bool {
+        self.iname.contains("rmnet_data")
+    }
+}
+
 // Internal method to list AF_INET info in a struct.  This method is used by
 // list_afiinet_netifas and local_ip,
 pub(crate) fn list_afinet_netifas_info() -> Result<Vec<AfInetInfo>, Error> {