From 4c64878f7c3e971e38542a285ddd2881c5751db6 Mon Sep 17 00:00:00 2001
From: Mark Pizzolato <mark@infocomm.com>
Date: Sat, 28 Aug 2021 13:15:54 -0700
Subject: [PATCH] ETHER: When opening an unused interface , avoid invoking non
 existent programs

---
 sim_ether.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/sim_ether.c b/sim_ether.c
index f566ece8..7fd2883e 100644
--- a/sim_ether.c
+++ b/sim_ether.c
@@ -2394,8 +2394,7 @@ else { /* !tap: */
             char command[1024];
 
             /* try to force an otherwise unused interface to be turned on */
-            memset(command, 0, sizeof(command));
-            snprintf(command, sizeof(command)-1, "ifconfig %s up", savname);
+            snprintf(command, sizeof(command), (sim_get_tool_path ("ifconfig")[0] != '\0') ? "ifconfig %s up" : "ip link set dev %s up", savname);
             if (system(command)) {};
             errbuf[0] = '\0';
             *handle = (void*) pcap_open_live(savname, bufsz, ETH_PROMISC, PCAP_READ_TIMEOUT, errbuf);