From d4e769197afccf425ec16dae5faeece72e8a5130 Mon Sep 17 00:00:00 2001
From: dmiller <dmiller@e0a8ed71-7df4-0310-8962-fdc924857419>
Date: Thu, 27 Jul 2023 17:31:48 +0000
Subject: [PATCH] Ncat server UDP: do not quit after EOF on STDIN. Fixes #2685

Conflict: NA
Reference: https://github.com/nmap/nmap/commit/d4e769197afccf425ec16dae5faeece72e8a5130

diff --git a/ncat/ncat_listen.c b/ncat/ncat_listen.c
index 3cecb64f8..c307c68c4 100644
--- a/ncat/ncat_listen.c
+++ b/ncat/ncat_listen.c
@@ -376,13 +376,13 @@ restart_fd_loop:
                 } else {
                     /* Read from stdin and write to all clients. */
                     rc = read_stdin();
-                    if (rc == 0) {
+                    if (rc == 0 && type == SOCK_STREAM) {
                         if (o.proto != IPPROTO_TCP || (o.proto == IPPROTO_TCP && o.sendonly)) {
                             /* There will be nothing more to send. If we're not
                                receiving anything, we can quit here. */
                             return 0;
                         }
-                        if (!o.noshutdown && type == SOCK_STREAM) shutdown_sockets(SHUT_WR);
+                        if (!o.noshutdown) shutdown_sockets(SHUT_WR);
                     }
                     if (rc < 0)
                         return 1;
-- 
2.33.0

