From c187e4d049a980cf2fcf7b3f20d1c2e712b6f5af Mon Sep 17 00:00:00 2001
From: Zhanglong Xia <zhanglongxia@google.com>
Date: Tue, 30 May 2023 01:14:44 +0800
Subject: [PATCH] [posix] add Thread network default interface name
 configuration (#9089)

The default Thread interface name `wpan0` has been occupied by
other programs in Android. Thread network has to use other
network interface name. Then users have to specify an interface
name when they are using the command `ot-ctl`. It's very inconvenient.

This commit adds a configuration for developers to set the default
Thread interface name.
---
 src/posix/client.cpp                         |  2 +-
 src/posix/main.c                             |  1 +
 src/posix/platform/daemon.cpp                |  5 +++--
 src/posix/platform/openthread-posix-config.h | 10 ++++++++++
 4 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/src/posix/client.cpp b/src/posix/client.cpp
index e57516e66..632e9c966 100644
--- a/src/posix/client.cpp
+++ b/src/posix/client.cpp
@@ -238,7 +238,7 @@ static bool ShouldEscape(char aChar)
 
 Config ParseArg(int &aArgCount, char **&aArgVector)
 {
-    Config config = {"wpan0"};
+    Config config = {OPENTHREAD_POSIX_CONFIG_THREAD_NETIF_DEFAULT_NAME};
 
     optind = 1;
 
diff --git a/src/posix/main.c b/src/posix/main.c
index 2966965e1..0f989dfb5 100644
--- a/src/posix/main.c
+++ b/src/posix/main.c
@@ -197,6 +197,7 @@ static void ParseArg(int aArgCount, char *aArgVector[], PosixConfig *aConfig)
     aConfig->mPlatformConfig.mPersistentInterface = false;
     aConfig->mPlatformConfig.mSpeedUpFactor       = 1;
     aConfig->mLogLevel                            = OT_LOG_LEVEL_CRIT;
+    aConfig->mPlatformConfig.mInterfaceName       = OPENTHREAD_POSIX_CONFIG_THREAD_NETIF_DEFAULT_NAME;
 #ifdef __linux__
     aConfig->mPlatformConfig.mRealTimeSignal = SIGRTMIN;
 #endif
diff --git a/src/posix/platform/daemon.cpp b/src/posix/platform/daemon.cpp
index 731b4f2b7..bb7b0d2dd 100644
--- a/src/posix/platform/daemon.cpp
+++ b/src/posix/platform/daemon.cpp
@@ -60,9 +60,10 @@ typedef char(Filename)[sizeof(sockaddr_un::sun_path)];
 
 void GetFilename(Filename &aFilename, const char *aPattern)
 {
-    int rval;
+    int         rval;
+    const char *netIfName = strlen(gNetifName) > 0 ? gNetifName : OPENTHREAD_POSIX_CONFIG_THREAD_NETIF_DEFAULT_NAME;
 
-    rval = snprintf(aFilename, sizeof(aFilename), aPattern, gNetifName);
+    rval = snprintf(aFilename, sizeof(aFilename), aPattern, netIfName);
     if (rval < 0 && static_cast<size_t>(rval) >= sizeof(aFilename))
     {
         DieNow(OT_EXIT_INVALID_ARGUMENTS);
diff --git a/src/posix/platform/openthread-posix-config.h b/src/posix/platform/openthread-posix-config.h
index 33ee49767..3b727c9fd 100644
--- a/src/posix/platform/openthread-posix-config.h
+++ b/src/posix/platform/openthread-posix-config.h
@@ -252,6 +252,16 @@
 #endif
 #endif
 
+/**
+ * @def OPENTHREAD_POSIX_CONFIG_THREAD_NETIF_DEFAULT_NAME
+ *
+ * Define the Thread default network interface name.
+ *
+ */
+#ifndef OPENTHREAD_POSIX_CONFIG_THREAD_NETIF_DEFAULT_NAME
+#define OPENTHREAD_POSIX_CONFIG_THREAD_NETIF_DEFAULT_NAME "wpan0"
+#endif
+
 #ifdef __APPLE__
 
 /**