#!/bin/sh
#
# Copyright (C) 2015  Internet Systems Consortium, Inc. ("ISC")
#
# Permission to use, copy, modify, and/or distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
# REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
# AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
# INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
# LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
# OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
# PERFORMANCE OF THIS SOFTWARE.

SYSTEMTESTTOP=..
. $SYSTEMTESTTOP/conf.sh

DIGCMD="$DIG @10.53.0.3 -p 5300 +tries=1 +time=1"
RNDCCMD="$RNDC -p 9953 -s 10.53.0.3 -c ../common/rndc.conf"

burst() {
    num=${3:-20}
    while [ $num -gt 0 ]; do
        num=`expr $num - 1`
        $DIGCMD ${num}${1}${2}.lamesub.example a > /dev/null 2>&1 &
    done
}

stat() {
    clients=`$RNDCCMD status | grep "recursive clients" |
            sed 's;.*: \([^/][^/]*\)/.*;\1;'`
    echo "I: clients: $clients"
    [ "$clients" = "" ] && return 1
    [ "$clients" -le $1 ]
}

status=0

echo "I: checking recursing clients are dropped at the per-server limit"
ret=0
# make the server lame and restart
$RNDCCMD flush
touch ans4/norespond
for try in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20; do
    burst a $try
    # fetches-per-server is at 400, but at 20qps against a lame server,
    # we'll reach 200 at the tenth second, and the quota should have been
    # tuned to less than that by then
    stat 200 || ret=1
    [ $ret -eq 1 ] && break
    sleep 1
done
if [ $ret != 0 ]; then echo "I: failed"; fi
status=`expr $status + $ret`

echo "I: dumping ADB data"
$RNDCCMD dumpdb -adb
info=`grep '10.53.0.4' ns3/named_dump.db | sed 's/.*\(atr [.0-9]*\).*\(quota [0-9]*\).*/I: \1 \2/'`
echo $info
set -- $info
quota=$5
[ $5 -lt 200 ] || ret=1

echo "I: checking servfail statistics"
rm -f ns3/named.stats
$RNDCCMD stats
for try in 1 2 3 4 5; do
    [ -f ns3/named.stats ] && break
    sleep 1
done
sspill=`grep 'spilled due to server' ns3/named.stats | sed 's/\([0-9][0-9]*\) spilled.*/\1/'`
[ -z "$sspill" ] && sspill=0
fails=`grep 'queries resulted in SERVFAIL' ns3/named.stats | sed 's/\([0-9][0-9]*\) queries.*/\1/'`
[ -z "$fails" ] && fails=0
[ "$fails" -ge "$sspill" ] || ret=1
if [ $ret != 0 ]; then echo "I: failed"; fi
status=`expr $status + $ret`

echo "I: checking lame server recovery"
ret=0
rm -f ans4/norespond
for try in 1 2 3 4 5; do
    burst b $try
    stat 200 || ret=1
    [ $ret -eq 1 ] && break
    sleep 1
done

echo "I: dumping ADB data"
$RNDCCMD dumpdb -adb
info=`grep '10.53.0.4' ns3/named_dump.db | sed 's/.*\(atr [.0-9]*\).*\(quota [0-9]*\).*/I: \1 \2/'`
echo $info
set -- $info
[ $5 -lt $quota ] || ret=1
quota=$5

for try in 1 2 3 4 5 6 7 8 9 10; do
    burst c $try
    stat 20 || ret=1
    [ $ret -eq 1 ] && break
    sleep 1
done

echo "I: dumping ADB data"
$RNDCCMD dumpdb -adb
info=`grep '10.53.0.4' ns3/named_dump.db | sed 's/.*\(atr [.0-9]*\).*\(quota [0-9]*\).*/I: \1 \2/'`
echo $info
set -- $info
[ $5 -gt $quota ] || ret=1
quota=$5
if [ $ret != 0 ]; then echo "I: failed"; fi
status=`expr $status + $ret`

if [ $ret != 0 ]; then echo "I: failed"; fi
status=`expr $status + $ret`

cp -f ns3/named2.conf ns3/named.conf
$RNDCCMD reconfig 2>&1 | sed 's/^/I:ns3 /'

echo "I: checking lame server clients are dropped at the per-domain limit"
ret=0
fail=0
success=0
touch ans4/norespond
for try in 1 2 3 4 5; do
    burst b $try 300
    $DIGCMD a ${try}.example > dig.out.ns3.$try
    grep "status: NOERROR" dig.out.ns3.$try > /dev/null 2>&1 && \
            success=`expr $success + 1`
    grep "status: SERVFAIL" dig.out.ns3.$try > /dev/null 2>&1 && \
            fail=`expr $fail + 1`
    stat 50 || ret=1
    [ $ret -eq 1 ] && break
    $RNDCCMD recursing 2>&1 | sed 's/^/I:ns3 /'
    sleep 1
done
echo "I: $success successful valid queries, $fail SERVFAIL"
if [ $ret != 0 ]; then echo "I: failed"; fi
status=`expr $status + $ret`

echo "I: checking drop statsistics"
rm -f ns3/named.stats
$RNDCCMD stats
for try in 1 2 3 4 5; do
    [ -f ns3/named.stats ] && break
    sleep 1
done
zspill=`grep 'spilled due to zone' ns3/named.stats | sed 's/\([0-9][0-9]*\) spilled.*/\1/'`
[ -z "$zspill" ] && zspill=0
drops=`grep 'queries dropped' ns3/named.stats | sed 's/\([0-9][0-9]*\) queries.*/\1/'`
[ -z "$drops" ] && drops=0
[ "$drops" -ge "$zspill" ] || ret=1
if [ $ret != 0 ]; then echo "I: failed"; fi
status=`expr $status + $ret`

cp -f ns3/named3.conf ns3/named.conf
$RNDCCMD reconfig 2>&1 | sed 's/^/I:ns3 /'

echo "I: checking lame server clients are dropped at the soft limit"
ret=0
fail=0
success=0
touch ans4/norespond
for try in 1 2 3 4 5; do
    burst b $try 400
    $DIGCMD a ${try}.example > dig.out.ns3.$try
    stat 360 || ret=1
    grep "status: NOERROR" dig.out.ns3.$try > /dev/null 2>&1 && \
            success=`expr $success + 1`
    grep "status: SERVFAIL" dig.out.ns3.$try > /dev/null 2>&1 && \
            fail=`expr $fail + 1`
    [ $ret -eq 1 ] && break
    sleep 1
done
echo "I: $success successful valid queries, $fail SERVFAIL"
[ "$success" -eq 5 ] || ret=1
if [ $ret != 0 ]; then echo "I: failed"; fi
status=`expr $status + $ret`

echo "I:exit status: $status"
exit $status