host does not parse options timeout and retries

Summary

man host mentions on -W option default could be overiden in /etc/resolv.conf. Worked on 9.11, no longer on 9.16.

BIND version used

BIND 9.16.16-RH (Stable Release) <id:0c314d8>
running on Linux x86_64 5.12.10-300.fc34.x86_64 #1 SMP Thu Jun 10 14:21:36 UTC 2021
built by make with '--build=x86_64-redhat-linux-gnu' '--host=x86_64-redhat-linux-gnu' '--program-prefix=' '--disable-dependency-tracking' '--prefix=/usr' '--exec-prefix=/usr' '--bindir=/usr/bin' '--sbindir=/usr/sbin' '--sysconfdir=/etc' '--datadir=/usr/share' '--includedir=/usr/include' '--libdir=/usr/lib64' '--libexecdir=/usr/libexec' '--sharedstatedir=/var/lib' '--mandir=/usr/share/man' '--infodir=/usr/share/info' '--with-python=/usr/bin/python3' '--with-libtool' '--localstatedir=/var' '--with-pic' '--disable-static' '--includedir=/usr/include/bind9' '--with-tuning=large' '--with-libidn2' '--with-maxminddb' '--enable-native-pkcs11' '--with-pkcs11=/usr/lib64/pkcs11/libsofthsm2.so' '--with-dlopen=yes' '--with-gssapi=yes' '--with-lmdb=yes' '--without-libjson' '--with-json-c' '--enable-dnstap' '--enable-fixed-rrset' '--enable-full-report' 'build_alias=x86_64-redhat-linux-gnu' 'host_alias=x86_64-redhat-linux-gnu' 'CC=gcc' 'CFLAGS= -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection' 'LDFLAGS=-Wl,-z,relro -Wl,--as-needed -Wl,-z,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld ' 'LT_SYS_LIBRARY_PATH=/usr/lib64:' 'PKG_CONFIG_PATH=:/usr/lib64/pkgconfig:/usr/share/pkgconfig'
compiled by GCC 11.1.1 20210428 (Red Hat 11.1.1-1)
compiled with OpenSSL version: OpenSSL 1.1.1k  FIPS 25 Mar 2021
linked to OpenSSL version: OpenSSL 1.1.1k  FIPS 25 Mar 2021
compiled with libuv version: 1.41.0
linked to libuv version: 1.41.0
compiled with libxml2 version: 2.9.12
linked to libxml2 version: 20912
compiled with json-c version: 0.14
linked to json-c version: 0.14
compiled with zlib version: 1.2.11
linked to zlib version: 1.2.11
linked to maxminddb version: 1.5.2
compiled with protobuf-c version: 1.3.3
linked to protobuf-c version: 1.3.3
threads support is enabled

default paths:
  named configuration:  /etc/named.conf
  rndc configuration:   /etc/rndc.conf
  DNSSEC root key:      /etc/bind.keys
  nsupdate session key: /var/run/named/session.key
  named PID file:       /var/run/named/named.pid
  named lock file:      /var/run/named/named.lock
  geoip-directory:      /usr/share/GeoIP

Steps to reproduce

• echo "nameserver 127.0.0.255 > /etc/resolv.conf"
• echo "options timeout:1 attempts:1" >> /etc/resolv.conf
• time host localhost

What is the current bug behavior?

(host on 9.16)

;; connection timed out; no servers could be reached


real	0m10.011s
user	0m0.005s
sys	0m0.006s

Obviously options are ignored.

What is the expected correct behavior?

(host on 9.11)

# time host localhost
;; connection timed out; no servers could be reached

real	0m2,010s
user	0m0,003s
sys	0m0,006s

Relevant configuration files

# resolv.conf
options timeout:1 attempts:1
nameserver 127.0.0.255

Relevant logs and/or screenshots

none

Possible fixes

It should parse more options in lib/irs/resconf.c, similar to lwres configuration parsing done in 9.11. Found when retesting ancient test case for RHEL bug. Manual page for host mentions default from /etc/resolv.conf. It should read it or at least manual page should not mention it is related.

Because it still works on 9.11, it is a regression.