1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
|
# Copyright (C) 2013 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.
# test response rate limiting
SYSTEMTESTTOP=..
. $SYSTEMTESTTOP/conf.sh
#set -x
ns1=10.53.0.1 # root, defining the others
ns2=10.53.0.2 # test server
ns3=10.53.0.3 # secondary test server
ns7=10.53.0.7 # whitelisted client
USAGE="$0: [-x]"
while getopts "x" c; do
case $c in
x) set -x;;
*) echo "$USAGE" 1>&2; exit 1;;
esac
done
shift `expr $OPTIND - 1 || true`
if test "$#" -ne 0; then
echo "$USAGE" 1>&2
exit 1
fi
# really quit on control-C
trap 'exit 1' 1 2 15
ret=0
setret () {
ret=1
echo "$*"
}
# Wait until soon after the start of a second to make results consistent.
# The start of a second credits a rate limit.
# This would be far easier in C or by assuming a modern version of perl.
sec_start () {
START=`date`
while true; do
NOW=`date`
if test "$START" != "$NOW"; then
return
fi
$PERL -e 'select(undef, undef, undef, 0.05)' || true
done
}
# turn off ${HOME}/.digrc
HOME=/dev/null; export HOME
# $1=result name $2=domain name $3=dig options
digcmd () {
OFILE=$1; shift
DIG_DOM=$1; shift
ARGS="+nosearch +time=1 +tries=1 +ignore -p 5300 $* $DIG_DOM @$ns2"
#echo I:dig $ARGS 1>&2
START=`date +%y%m%d%H%M.%S`
RESULT=`$DIG $ARGS 2>&1 | tee $OFILE=TEMP \
| sed -n -e '/^;; AUTHORITY/,/^$/d' \
-e '/^;; ADDITIONAL/,/^$/d' \
-e 's/^[^;].* \([^ ]\{1,\}\)$/\1/p' \
-e 's/;; flags.* tc .*/TC/p' \
-e 's/;; .* status: NXDOMAIN.*/NXDOMAIN/p' \
-e 's/;; .* status: SERVFAIL.*/SERVFAIL/p' \
-e 's/;; connection timed out.*/drop/p' \
-e 's/;; communications error to.*/drop/p' \
| tr -d '\n'`
mv "$OFILE=TEMP" "$OFILE=$RESULT"
touch -t $START "$OFILE=$RESULT"
}
# $1=number of tests $2=target domain $3=dig options
QNUM=1
burst () {
BURST_LIMIT=$1; shift
BURST_DOM_BASE="$1"; shift
while test "$BURST_LIMIT" -ge 1; do
CNT=`expr "00$QNUM" : '.*\(...\)'`
eval BURST_DOM="$BURST_DOM_BASE"
FILE="dig.out-$BURST_DOM-$CNT"
digcmd $FILE $BURST_DOM $* &
QNUM=`expr $QNUM + 1`
BURST_LIMIT=`expr "$BURST_LIMIT" - 1`
done
}
# $1=domain $2=IP address $3=# of IP addresses $4=TC $5=drop
# $6=NXDOMAIN $7=SERVFAIL or other errors
ck_result() {
BAD=
wait
ADDRS=`ls dig.out-$1-*=$2 2>/dev/null | wc -l`
# count simple truncated and truncated NXDOMAIN as TC
TC=`ls dig.out-$1-*=TC dig.out-$1-*=NXDOMAINTC 2>/dev/null | wc -l`
DROP=`ls dig.out-$1-*=drop 2>/dev/null | wc -l`
# count NXDOMAIN and truncated NXDOMAIN as NXDOMAIN
NXDOMAIN=`ls dig.out-$1-*=NXDOMAIN dig.out-$1-*=NXDOMAINTC 2>/dev/null \
| wc -l`
SERVFAIL=`ls dig.out-$1-*=SERVFAIL 2>/dev/null | wc -l`
if test $ADDRS -ne "$3"; then
setret "I:"$ADDRS" instead of $3 '$2' responses for $1"
BAD=yes
fi
if test $TC -ne "$4"; then
setret "I:"$TC" instead of $4 truncation responses for $1"
BAD=yes
fi
if test $DROP -ne "$5"; then
setret "I:"$DROP" instead of $5 dropped responses for $1"
BAD=yes
fi
if test $NXDOMAIN -ne "$6"; then
setret "I:"$NXDOMAIN" instead of $6 NXDOMAIN responses for $1"
BAD=yes
fi
if test $SERVFAIL -ne "$7"; then
setret "I:"$SERVFAIL" instead of $7 error responses for $1"
BAD=yes
fi
if test -z "$BAD"; then
rm -f dig.out-$1-*
fi
}
ckstats () {
LABEL="$1"; shift
TYPE="$1"; shift
EXPECTED="$1"; shift
C=`sed -n -e "s/[ ]*\([0-9]*\).responses $TYPE for rate limits.*/\1/p" \
ns2/named.stats | tail -1`
C=`expr 0$C + 0`
if test "$C" -ne $EXPECTED; then
setret "I:wrong $LABEL $TYPE statistics of $C instead of $EXPECTED"
fi
}
#########
sec_start
# Tests of referrals to "." must be done before the hints are loaded
# or with "additional-from-cache no"
burst 5 a1.tld3 +norec
# basic rate limiting
burst 3 a1.tld2
# 1 second delay allows an additional response.
sleep 1
burst 10 a1.tld2
# Request 30 different qnames to try a wildcard.
burst 30 'x$CNT.a2.tld2'
# These should be counted and limited but are not. See RT33138.
burst 10 'y.x$CNT.a2.tld2'
# IP TC drop NXDOMAIN SERVFAIL
# referrals to "."
ck_result a1.tld3 '' 2 1 2 0 0
# check 13 results including 1 second delay that allows an additional response
ck_result a1.tld2 192.0.2.1 3 4 6 0 0
# Check the wild card answers.
# The parent name of the 30 requests is counted.
ck_result 'x*.a2.tld2' 192.0.2.2 2 10 18 0 0
# These should be limited but are not. See RT33138.
ck_result 'y.x*.a2.tld2' 192.0.2.2 10 0 0 0 0
#########
sec_start
burst 10 'x.a3.tld3'
burst 10 'y$CNT.a3.tld3'
burst 10 'z$CNT.a4.tld2'
# 10 identical recursive responses are limited
ck_result 'x.a3.tld3' 192.0.3.3 2 3 5 0 0
# 10 different recursive responses are not limited
ck_result 'y*.a3.tld3' 192.0.3.3 10 0 0 0 0
# 10 different NXDOMAIN responses are limited based on the parent name.
# We count 13 responses because we count truncated NXDOMAIN responses
# as both truncated and NXDOMAIN.
ck_result 'z*.a4.tld2' x 0 3 5 5 0
$RNDC -c $SYSTEMTESTTOP/common/rndc.conf -p 9953 -s $ns2 stats
ckstats first dropped 36
ckstats first truncated 21
#########
sec_start
burst 10 a5.tld2 +tcp
burst 10 a6.tld2 -b $ns7
burst 10 a7.tld4
burst 2 a8.tld2 AAAA
burst 2 a8.tld2 TXT
burst 2 a8.tld2 SPF
# IP TC drop NXDOMAIN SERVFAIL
# TCP responses are not rate limited
ck_result a5.tld2 192.0.2.5 10 0 0 0 0
# whitelisted client is not rate limited
ck_result a6.tld2 192.0.2.6 10 0 0 0 0
# Errors such as SERVFAIL are rate limited.
ck_result a7.tld4 x 0 0 8 0 2
# NODATA responses are counted as the same regardless of qtype.
ck_result a8.tld2 '' 2 2 2 0 0
$RNDC -c $SYSTEMTESTTOP/common/rndc.conf -p 9953 -s $ns2 stats
ckstats second dropped 46
ckstats second truncated 23
#########
sec_start
# IP TC drop NXDOMAIN SERVFAIL
# all-per-second
# The qnames are all unique but the client IP address is constant.
QNUM=101
burst 60 'all$CNT.a9.tld2'
ck_result 'a*.a9.tld2' 192.0.2.8 50 0 10 0 0
$RNDC -c $SYSTEMTESTTOP/common/rndc.conf -p 9953 -s $ns2 stats
ckstats final dropped 56
ckstats final truncated 23
echo "I:exit status: $ret"
# exit $ret
[ $ret -ne 0 ] && echo "I:test failure overridden"
exit 0
|
