From 62dbd414b7dbebb3b2d2db907bd45297c5a08822 Mon Sep 17 00:00:00 2001
From: Rob Heaton <rob@stripe.com>
Date: Mon, 6 Aug 2018 11:20:09 -0700
Subject: [PATCH] Fix bug in fuzzer ID length

---
 client/main.go | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/client/main.go b/client/main.go
index bb38ba0..656b3fc 100644
--- a/client/main.go
+++ b/client/main.go
@@ -95,9 +95,14 @@ func init() {
 
 func usableHostName(orig string) (valid string) {
 	valid = invalidFuzzerNames.ReplaceAllString(orig, "_")
-	// fuzzer name is ${hostname}-xxxx, so this string can be max 29 chars
-	if len(valid) > 29 {
-		valid = valid[0:29]
+	// Max AFL fuzzer ID length is 32:
+	// https://github.com/mirrorer/afl/blob/2fb5a3482ec27b593c57258baae7089ebdc89043/afl-fuzz.c#L7456
+	//
+	// Our fuzzer ID is ${hostname}-xxxx, so the hostname portion can
+	// be max 32 - 5 = 27 chars.
+	maxHostnameLen := 27
+	if len(valid) > maxHostnameLen {
+		valid = valid[0:maxHostnameLen]
 	}
 	return
 }