Package: bind9-host
Version: 1:9.3.2-2
When I have a resolv.conf which have empty "search" directive,
"host" command doesn't work as follows.
| % host www.debian.org
| ;; connection timed out; no servers could be reached
The resolv.conf is generated by dhcp-client as follows.
| % cat /etc/resolv.conf
| search
| nameserver 192.168.1.1
Note that there is no space after "search"
| % cat -e /etc/resolv.conf
| search$
| nameserver 192.168.1.1$
This is a problem of "host" command because
DNS works well with telnet.
| % telnet www.debian.org 80
| Trying 194.109.137.218...
| Connected to www.debian.org.
| Escape character is '^]'.
| ^]
| telnet> close
| Connection closed.
strace shows that "host" command only querys to 127.0.0.1 and ::1.
It doesn't query to 192.168.1.1.
| % strace -fe sendmsg host www.debian.org
| Process 17429 attached
| Process 17430 attached
| Process 17431 attached
| [pid 17429] sendmsg(20, {msg_name(16)={sa_family=AF_INET, sin_port=htons(53),
sin_addr=inet_addr("127.0.0.1")},
msg_iov(1)=[{"T\211\1\0\0\1\0\0\0\0\0\0\3www\6debian\3org\0\0\1\0\1", 32}],
msg_controllen=0, msg_flags=0}, 0) = 32
| [pid 17429] sendmsg(21, {msg_name(28)={sa_family=AF_INET6,
sin6_port=htons(53), inet_pton(AF_INET6, "::1", &sin6_addr), sin6_flowinfo=0,
sin6_scope_id=0},
msg_iov(1)=[{"T\211\1\0\0\1\0\0\0\0\0\0\3www\6debian\3org\0\0\1\0\1", 32}],
msg_controllen=0, msg_flags=0}, 0) = 32
| [pid 17429] sendmsg(20, {msg_name(16)={sa_family=AF_INET, sin_port=htons(53),
sin_addr=inet_addr("127.0.0.1")},
msg_iov(1)=[{"T\211\1\0\0\1\0\0\0\0\0\0\3www\6debian\3org\0\0\1\0\1", 32}],
msg_controllen=0, msg_flags=0}, 0) = 32
| [pid 17429] sendmsg(21, {msg_name(28)={sa_family=AF_INET6,
sin6_port=htons(53), inet_pton(AF_INET6, "::1", &sin6_addr), sin6_flowinfo=0,
sin6_scope_id=0},
msg_iov(1)=[{"T\211\1\0\0\1\0\0\0\0\0\0\3www\6debian\3org\0\0\1\0\1", 32}],
msg_controllen=0, msg_flags=0}, 0) = 32
| ;; connection timed out; no servers could be reached
| [pid 17428] --- SIGTERM (Terminated) @ 0 (0) ---
| Process 17429 detached
| Process 17431 detached
| Process 17430 detached
| Process 17428 detached
If I modify resolv.conf to a space after "search",
"host" command fails with parsing resolv.conf.
| nute(9:22:28)% cat -e /etc/resolv.conf
| search $
| nameserver 192.168.1.1$
| % host www.debian.org
| host: parse of /etc/resolv.conf failed
If I modify resolv.conf to swap lines in resolv.conf,
"host" command also fails with parsing resolv.conf.
| nute(9:22:48)% cat -e /etc/resolv.conf
| nameserver 192.168.1.1$
| search$
| % host www.debian.org
| host: parse of /etc/resolv.conf failed
It seems very likely a bug of resolv.conf parser in "host"
command.
| % dpkg -l|egrep 'bind9|dhcp'
| ii bind9-host 9.3.2-2 Version of
'host' bundled with BIND 9.X
| ii dhcp-client 2.0pl5-19.4 DHCP Client
| ii libbind9-0 9.3.2-2 BIND9 Shared
Library used by BIND
--
Tanaka Akira
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