From e34e7a4d79f356c2fe0e31f620f9eba44eee1b21 Mon Sep 17 00:00:00 2001
From: Rudra Arora <aroraru@tcd.ie>
Date: Mon, 10 Jul 2023 12:53:09 +0100
Subject: [PATCH] DNS resolve TryFrom &str implementation

---
 library/std/src/sys/wasix/net.rs | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/library/std/src/sys/wasix/net.rs b/library/std/src/sys/wasix/net.rs
index 37e5432697c8c..152212250191c 100644
--- a/library/std/src/sys/wasix/net.rs
+++ b/library/std/src/sys/wasix/net.rs
@@ -1332,7 +1332,19 @@ impl<'a> TryFrom<&'a str> for LookupHost {
     type Error = io::Error;
 
     fn try_from(v: &'a str) -> io::Result<LookupHost> {
-        TryFrom::try_from((v, 0u16))
+        macro_rules! try_opt {
+            ($e:expr, $msg:expr) => {
+                match $e {
+                    Some(r) => r,
+                    None => return Err(io::const_io_error!(io::ErrorKind::InvalidInput, $msg)),
+                }
+            };
+        }
+
+        // split the string by ':' and convert the second part to u16
+        let (host, port_str) = try_opt!(v.rsplit_once(':'), "invalid socket address");
+        let port: u16 = try_opt!(port_str.parse().ok(), "invalid port value");
+        TryFrom::try_from((host, port))
     }
 }