[UNDERTOW-1493] Undertow 2.0.20.Final XNIO I/O Thread 100% CPU test

curl-ssltest.sh

#!/bin/bash
# Simple test for [UNDERTOW-1493] and similar TLSv1.3 half-open issues.
#
# NOTE: Requires a recent curl version, which should support HTTP2 and TLSv1.3.
#
# USAGE:
#   1. Run against a Undertow HTTP2, TLSv1.3 enabled server which MUST be located
#      in a different network (ie. one or multiple routers in between the host
#      executing this script and the target server).
#   2. Pull the network cable of the host executing this script (yes really). This will
#      interrupt the TLS secured HTTP2 connections at various stages and expose bugs.
#   3. Check the Undertow servers CPU usage (especially XNIO I/O threads).
#   4. Plug network cable again and back to step 2 (~50% hit rate).
#

targetUrl="$1"

while true
do
    curl --silent --tlsv1.3 --http2 "$targetUrl" >/dev/null 2>&1 &
    curl --silent --tlsv1.3 --http2 "$targetUrl" >/dev/null 2>&1 &
    curl --silent --tlsv1.3 --http2 "$targetUrl" >/dev/null 2>&1 &
    curl --silent --tlsv1.3 --http2 "$targetUrl" >/dev/null 2>&1 &
    curl --silent --tlsv1.3 --http2 "$targetUrl" >/dev/null 2>&1 &
    curl --silent --tlsv1.3 --http2 "$targetUrl" >/dev/null 2>&1 &
    curl --silent --tlsv1.3 --http2 "$targetUrl" >/dev/null 2>&1 &
    curl --silent --tlsv1.3 --http2 "$targetUrl" >/dev/null 2>&1 &
    wait
done