From 8861a97efac54a9ab17e8174cc826a0ca1804e41 Mon Sep 17 00:00:00 2001
From: Abdirahim Musse <33973272+abmusse@users.noreply.github.com>
Date: Fri, 22 Dec 2023 23:58:49 +0000
Subject: [PATCH] aix,ibmi: use uv_interface_addresses instead of getifaddrs
 (#4222)

AIX and IBM i don't have getifaddrs but we do have code in
`uv_interface_addresses` to get the interface addresses.

Refs: https://github.com/libuv/libuv/issues/4117
---
 src/unix/tcp.c | 31 +++++++++++++++++++++++++------
 1 file changed, 25 insertions(+), 6 deletions(-)

diff --git a/src/unix/tcp.c b/src/unix/tcp.c
index f455c53f..a4ef71b5 100644
--- a/src/unix/tcp.c
+++ b/src/unix/tcp.c
@@ -220,14 +220,32 @@ static int uv__is_ipv6_link_local(const struct sockaddr* addr) {
 
 
 static int uv__ipv6_link_local_scope_id(void) {
-/* disable link local on AIX & PASE for now */
-#if defined(_AIX)
-  return 0;
-#else
   struct sockaddr_in6* a6;
+  int rv;
+#if defined(_AIX)
+  /* AIX & IBM i do not have ifaddrs
+   * so fallback to use uv_interface_addresses */
+  uv_interface_address_t* interfaces;
+  uv_interface_address_t* ifa;
+  int count, i;
+
+  if (uv_interface_addresses(&interfaces, &count))
+    return 0;
+
+  rv = 0;
+
+  for (ifa = interfaces; ifa != &interfaces[count]; ifa++) {
+    if (uv__is_ipv6_link_local((struct sockaddr*) &ifa->address)) {
+      rv = ifa->address.address6.sin6_scope_id;
+      break;
+    }
+  }
+
+  uv_free_interface_addresses(interfaces, count);
+
+#else
   struct ifaddrs* ifa;
   struct ifaddrs* p;
-  int rv;
 
   if (getifaddrs(&ifa))
     return 0;
@@ -244,8 +262,9 @@ static int uv__ipv6_link_local_scope_id(void) {
   }
 
   freeifaddrs(ifa);
+#endif /* defined(_AIX) */
+
   return rv;
-#endif
 }