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dig: return a non-zero exit code for failed TCP EOF retries

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dig retries a TCP query when a server closes the connection prematurely.
However, dig's exit code remains unaffected even if the second attempt
to get a response also fails with the same error for the same lookup,
which should not be the case.  Ensure the exit code is updated
appropriately when a retry triggered by a TCP EOF condition fails.
This commit is contained in:
Michał Kępień
2019-01-18 11:15:19 +01:00
committed by Evan Hunt
parent 91d1218097
commit 0f168a4b37
4 changed files with 263 additions and 9 deletions
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64
bin/tests/system/digdelv/tests.sh
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@@ -18,7 +18,7 @@ status=0
n=0
sendcmd() {
"$PERL" "$SYSTEMTESTTOP/send.pl" 10.53.0.4 "$EXTRAPORT1"
"$PERL" "$SYSTEMTESTTOP/send.pl" "${1}" "$EXTRAPORT1"
}
dig_with_opts() {
@@ -247,7 +247,7 @@ if [ -x "$DIG" ] ; then
echo_i "checking dig preserves origin on TCP retries ($n)"
ret=0
# Ask ans4 to still accept TCP connections, but not respond to queries
echo "//" | sendcmd
echo "//" | sendcmd 10.53.0.4
dig_with_opts -d +tcp @10.53.0.4 +retry=1 +time=1 +domain=bar foo > dig.out.test$n 2>&1 && ret=1
test "$(grep -c "trying origin bar" dig.out.test$n)" -eq 2 || ret=1
grep "using root origin" < dig.out.test$n > /dev/null && ret=1
@@ -524,6 +524,66 @@ if [ -x "$DIG" ] ; then
grep "Dump of all outstanding memory allocations" dig.out.test$n > /dev/null && ret=1
if [ $ret -ne 0 ]; then echo_i "failed"; fi
status=$((status+ret))
n=$((n+1))
echo_i "checking exit code for a retry upon TCP EOF (immediate -> immediate) ($n)"
ret=0
echo "no_response no_response" | sendcmd 10.53.0.5
dig_with_opts @10.53.0.5 example AXFR +tries=1 > dig.out.test$n 2>&1 && ret=1
# Sanity check: ensure ans5 behaves as expected.
[ `grep "communications error.*end of file" dig.out.test$n | wc -l` -eq 2 ] || ret=1
if [ $ret -ne 0 ]; then echo_i "failed"; fi
status=$((status+ret))
n=$((n+1))
echo_i "checking exit code for a retry upon TCP EOF (partial AXFR -> partial AXFR) ($n)"
ret=0
echo "partial_axfr partial_axfr" | sendcmd 10.53.0.5
dig_with_opts @10.53.0.5 example AXFR +tries=1 > dig.out.test$n 2>&1 && ret=1
# Sanity check: ensure ans5 behaves as expected.
[ `grep "communications error.*end of file" dig.out.test$n | wc -l` -eq 2 ] || ret=1
if [ $ret -ne 0 ]; then echo_i "failed"; fi
status=$((status+ret))
n=$((n+1))
echo_i "checking exit code for a retry upon TCP EOF (immediate -> partial AXFR) ($n)"
ret=0
echo "no_response partial_axfr" | sendcmd 10.53.0.5
dig_with_opts @10.53.0.5 example AXFR +tries=1 > dig.out.test$n 2>&1 && ret=1
# Sanity check: ensure ans5 behaves as expected.
[ `grep "communications error.*end of file" dig.out.test$n | wc -l` -eq 2 ] || ret=1
if [ $ret -ne 0 ]; then echo_i "failed"; fi
status=$((status+ret))
n=$((n+1))
echo_i "checking exit code for a retry upon TCP EOF (partial AXFR -> immediate) ($n)"
ret=0
echo "partial_axfr no_response" | sendcmd 10.53.0.5
dig_with_opts @10.53.0.5 example AXFR +tries=1 > dig.out.test$n 2>&1 && ret=1
# Sanity check: ensure ans5 behaves as expected.
[ `grep "communications error.*end of file" dig.out.test$n | wc -l` -eq 2 ] || ret=1
if [ $ret -ne 0 ]; then echo_i "failed"; fi
status=$((status+ret))
n=$((n+1))
echo_i "checking exit code for a retry upon TCP EOF (immediate -> complete AXFR) ($n)"
ret=0
echo "no_response complete_axfr" | sendcmd 10.53.0.5
dig_with_opts @10.53.0.5 example AXFR +tries=1 > dig.out.test$n 2>&1 || ret=1
# Sanity check: ensure ans5 behaves as expected.
[ `grep "communications error.*end of file" dig.out.test$n | wc -l` -eq 1 ] || ret=1
if [ $ret -ne 0 ]; then echo_i "failed"; fi
status=$((status+ret))
n=$((n+1))
echo_i "checking exit code for a retry upon TCP EOF (partial AXFR -> complete AXFR) ($n)"
ret=0
echo "partial_axfr complete_axfr" | sendcmd 10.53.0.5
dig_with_opts @10.53.0.5 example AXFR +tries=1 > dig.out.test$n 2>&1 || ret=1
# Sanity check: ensure ans5 behaves as expected.
[ `grep "communications error.*end of file" dig.out.test$n | wc -l` -eq 1 ] || ret=1
if [ $ret -ne 0 ]; then echo_i "failed"; fi
status=$((status+ret))
else
echo_i "$DIG is needed, so skipping these dig tests"
fi