From bd06f28812dd675e68fdd568d5e14b7cddb9a777 Mon Sep 17 00:00:00 2001
From: James Morris <morisja@gmail.com>
Date: Mon, 21 Oct 2024 19:50:38 -0400
Subject: [PATCH] Getservbyport should refuse port 0

issue-142

If nsncd queries sssd for port 0, ENOMEM is returned causing error logs.
This has been confirmed by using the getservbyport_r man page example
and amending nsswitch.conf
---
 src/handlers.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/handlers.rs b/src/handlers.rs
index 4e3b1bd..3c6d3a4 100644
--- a/src/handlers.rs
+++ b/src/handlers.rs
@@ -204,6 +204,11 @@ impl FromStr for ServiceWithPort {
 
 impl ServiceWithPort {
     fn lookup(&self) -> Result<Option<Service>> {
+        //issue-142
+        //port 0 lookups to sssd return ENOMEM
+        if self.port == 0 {
+            return Ok(None);
+        }
         let proto = match &self.proto {
             Some(p) => Some(CString::new(p.clone())?),
             None => None,