From 2912b4dadbaba99fdb0743b2af4600419b7b1264 Mon Sep 17 00:00:00 2001
From: Pasukhin Dmitry <dpasukhi@opencascade.com>
Date: Sun, 23 Mar 2025 15:52:48 +0000
Subject: [PATCH] Foundation Classes - Host resolving by itself #457

Fixed issue  when gethostbyname returns a nullptr, because the host can't resolve itself
---
 src/FoundationClasses/TKernel/OSD/OSD_Host.cxx | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/FoundationClasses/TKernel/OSD/OSD_Host.cxx b/src/FoundationClasses/TKernel/OSD/OSD_Host.cxx
index ea8b563acf..57a263f084 100644
--- a/src/FoundationClasses/TKernel/OSD/OSD_Host.cxx
+++ b/src/FoundationClasses/TKernel/OSD/OSD_Host.cxx
@@ -139,8 +139,13 @@ TCollection_AsciiString OSD_Host::InternetAddress()
   char                    buffer[16];
   TCollection_AsciiString result, host;
 
-  host = HostName();
-  memcpy(&internet_address, gethostbyname(host.ToCString()), sizeof(struct hostent));
+  host                    = HostName();
+  const auto* aHostByName = gethostbyname(host.ToCString());
+  if (aHostByName == nullptr)
+  {
+    aHostByName = gethostbyname("localhost");
+  }
+  memcpy(&internet_address, aHostByName, sizeof(struct hostent));
 
   // Gets each bytes into integers
   a = (unsigned char)internet_address.h_addr_list[0][0];