From d216749f27ad25c5e17bc7eaccea691705bd6306 Mon Sep 17 00:00:00 2001
From: Carl Montanari <carl.r.montanari@gmail.com>
Date: Mon, 25 Nov 2024 11:53:19 -0800
Subject: [PATCH] fix: slow down auth loops to be nicer to cpus

---
 channel/auth.go | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/channel/auth.go b/channel/auth.go
index 53c5007..134e29c 100644
--- a/channel/auth.go
+++ b/channel/auth.go
@@ -78,6 +78,13 @@ func (c *Channel) authenticateSSH(ctx context.Context, p, pp []byte) *result {
 			return &result{nil, err}
 		}
 
+		if nb == nil {
+			// nothing read, sleep a bit then try again
+			time.Sleep(c.ReadDelay)
+
+			continue
+		}
+
 		b = append(b, nb...)
 
 		err = c.sshMessageHandler(b)
@@ -188,6 +195,13 @@ func (c *Channel) authenticateTelnet(ctx context.Context, u, p []byte) *result {
 			return &result{nil, err}
 		}
 
+		if nb == nil {
+			// nothing read, sleep a bit then try again
+			time.Sleep(c.ReadDelay)
+
+			continue
+		}
+
 		b = append(b, nb...)
 
 		if c.PromptPattern.Match(b) {