From d830c062aea6389e02718592d623ef7f8fe81f4a Mon Sep 17 00:00:00 2001
From: catoc <catoc@users.noreply.github.com>
Date: Thu, 23 Apr 2026 11:37:20 +0800
Subject: [PATCH] fix(edge): prevent crash on supernode resolution failure at
 startup

Add a retry loop in edge_init to handle failed supernode DNS resolution.
Prevents NULL pointer dereference of eee->curr_sn when no supernodes
are available at startup.
---
 src/edge_utils.c | 25 ++++++++++++++++++-------
 1 file changed, 18 insertions(+), 7 deletions(-)

diff --git a/src/edge_utils.c b/src/edge_utils.c
index a67ced95..9ea388d3 100644
--- a/src/edge_utils.c
+++ b/src/edge_utils.c
@@ -667,13 +667,24 @@ struct n3n_runtime_data* edge_init (const n2n_edge_conf_t *conf, int *rv) {
     // Show the user what has been configured
     resolve_log_hostnames(RESOLVE_LIST_SUPERNODE);
 
-    if(resolve_hostnames_str_to_peer_info(
-           RESOLVE_LIST_SUPERNODE,
-           &eee->supernodes)) {
-        traceEvent(
-            TRACE_WARNING,
-            "resolve_hostnames_str_to_peer_info returned errors"
-        );
+    // Loop until we successfully resolve at least one supernode
+    while(1) {
+        if(resolve_hostnames_str_to_peer_info(
+               RESOLVE_LIST_SUPERNODE,
+               &eee->supernodes)) {
+            traceEvent(
+                TRACE_WARNING,
+                "resolve_hostnames_str_to_peer_info returned errors"
+            );
+        }
+
+        // If we successfully got a supernode, break out of the loop
+        if(eee->supernodes) {
+            break;
+        }
+
+        traceEvent(TRACE_WARNING, "No supernodes resolved, retrying in 5 seconds...");
+        sleep(5);
     }
 
     // Statically calculate how many packet buffers we need: