From b0012424c5f432debfa42ba145e2672966d5f6d5 Mon Sep 17 00:00:00 2001
From: Lucas Fernandes Nogueira <lucas@tauri.app>
Date: Mon, 6 Oct 2025 13:11:48 -0300
Subject: [PATCH] fix(cli): resolve IP when dev URL host is unspecified, closes
 #13356 (#14115)

currently the `use_network_address_for_dev_url` function already detects Ipv4Addr::UNSPECIFIED to resolve the local IP address for mobile development when the dev URL host is 0.0.0.0, but we only call it when `--host` is provided or running on a physical device. This change detects the unspecified host early and force the resolution to run even for simulator builds
---
 .changes/fix-unspeficied-dev-host.md       |  6 ++++++
 crates/tauri-cli/src/mobile/android/dev.rs | 19 +++++++++++++++++--
 crates/tauri-cli/src/mobile/ios/dev.rs     | 19 +++++++++++++++++--
 crates/tauri-cli/src/mobile/mod.rs         |  4 +---
 4 files changed, 41 insertions(+), 7 deletions(-)
 create mode 100644 .changes/fix-unspeficied-dev-host.md

diff --git a/.changes/fix-unspeficied-dev-host.md b/.changes/fix-unspeficied-dev-host.md
new file mode 100644
index 000000000..488585513
--- /dev/null
+++ b/.changes/fix-unspeficied-dev-host.md
@@ -0,0 +1,6 @@
+---
+"@tauri-apps/cli": patch:bug
+"tauri-cli": patch:bug
+---
+
+Resolve local IP address when `tauri.conf.json > build > devUrl` host is `0.0.0.0`.
diff --git a/crates/tauri-cli/src/mobile/android/dev.rs b/crates/tauri-cli/src/mobile/android/dev.rs
index e5a3b2124..05540d26c 100644
--- a/crates/tauri-cli/src/mobile/android/dev.rs
+++ b/crates/tauri-cli/src/mobile/android/dev.rs
@@ -33,8 +33,9 @@ use cargo_mobile2::{
   opts::{FilterLevel, NoiseLevel, Profile},
   target::TargetTrait,
 };
+use url::Host;
 
-use std::{env::set_current_dir, path::PathBuf};
+use std::{env::set_current_dir, net::Ipv4Addr, path::PathBuf};
 
 #[derive(Debug, Clone, Parser)]
 #[clap(
@@ -231,12 +232,26 @@ fn run_dev(
   metadata: &AndroidMetadata,
   noise_level: NoiseLevel,
 ) -> Result<()> {
-  // when running on an actual device we must use the network IP
+  // when --host is provided or running on a physical device or resolving 0.0.0.0 we must use the network IP
   if options.host.0.is_some()
     || device
       .as_ref()
       .map(|device| !device.serial_no().starts_with("emulator"))
       .unwrap_or(false)
+    || tauri_config
+      .lock()
+      .unwrap()
+      .as_ref()
+      .unwrap()
+      .build
+      .dev_url
+      .as_ref()
+      .is_some_and(|url| {
+        matches!(
+          url.host(),
+          Some(Host::Ipv4(i)) if i == Ipv4Addr::UNSPECIFIED
+        )
+      })
   {
     use_network_address_for_dev_url(&tauri_config, &mut dev_options, options.force_ip_prompt)?;
   }
diff --git a/crates/tauri-cli/src/mobile/ios/dev.rs b/crates/tauri-cli/src/mobile/ios/dev.rs
index 406a72a0b..36d88b511 100644
--- a/crates/tauri-cli/src/mobile/ios/dev.rs
+++ b/crates/tauri-cli/src/mobile/ios/dev.rs
@@ -32,8 +32,9 @@ use cargo_mobile2::{
   env::Env,
   opts::{NoiseLevel, Profile},
 };
+use url::Host;
 
-use std::{env::set_current_dir, path::PathBuf};
+use std::{env::set_current_dir, net::Ipv4Addr, path::PathBuf};
 
 const PHYSICAL_IPHONE_DEV_WARNING: &str = "To develop on physical phones you need the `--host` option (not required for Simulators). See the documentation for more information: https://v2.tauri.app/develop/#development-server";
 
@@ -271,12 +272,26 @@ fn run_dev(
   config: &AppleConfig,
   noise_level: NoiseLevel,
 ) -> Result<()> {
-  // when running on an actual device we must use the network IP
+  // when --host is provided or running on a physical device or resolving 0.0.0.0 we must use the network IP
   if options.host.0.is_some()
     || device
       .as_ref()
       .map(|device| !matches!(device.kind(), DeviceKind::Simulator))
       .unwrap_or(false)
+    || tauri_config
+      .lock()
+      .unwrap()
+      .as_ref()
+      .unwrap()
+      .build
+      .dev_url
+      .as_ref()
+      .is_some_and(|url| {
+        matches!(
+          url.host(),
+          Some(Host::Ipv4(i)) if i == Ipv4Addr::UNSPECIFIED
+        )
+      })
   {
     use_network_address_for_dev_url(&tauri_config, &mut dev_options, options.force_ip_prompt)?;
   }
diff --git a/crates/tauri-cli/src/mobile/mod.rs b/crates/tauri-cli/src/mobile/mod.rs
index a764ae360..301900b04 100644
--- a/crates/tauri-cli/src/mobile/mod.rs
+++ b/crates/tauri-cli/src/mobile/mod.rs
@@ -268,9 +268,7 @@ fn use_network_address_for_dev_url(
   let ip = if let Some(url) = &mut dev_url {
     let localhost = match url.host() {
       Some(url::Host::Domain(d)) => d == "localhost",
-      Some(url::Host::Ipv4(i)) => {
-        i == std::net::Ipv4Addr::LOCALHOST || i == std::net::Ipv4Addr::UNSPECIFIED
-      }
+      Some(url::Host::Ipv4(i)) => i == Ipv4Addr::LOCALHOST || i == Ipv4Addr::UNSPECIFIED,
       _ => false,
     };