Date: Wed, 23 Jul 1997 06:32:07 +0200 (CEST) From: Andre Albsmeier <Andre.Albsmeier@mchp.siemens.de> To: FreeBSD-gnats-submit@FreeBSD.ORG Subject: bin/4147: libc changes make ypserv unimpossible to resolve hostname Message-ID: <199707230432.GAA24951@curry.mchp.siemens.de> Resent-Message-ID: <199707230440.VAA23688@hub.freebsd.org>
next in thread | raw e-mail | index | archive | help
>Number: 4147
>Category: bin
>Synopsis: libc changes make ypserv unimpossible to resolve hostname
>Confidential: no
>Severity: serious
>Priority: high
>Responsible: freebsd-bugs
>State: open
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Tue Jul 22 21:40:01 PDT 1997
>Last-Modified:
>Originator: Andre Albsmeier
>Organization:
>Release: FreeBSD 2.2-STABLE i386
>Environment:
2.2-STABLE
>Description:
Hi,
when running "ypserv -n" on 2.2-STABLE it is no longer possible for ypserv
to resolve hostnames which are not fully qualified. This is due to a change in
lib/libc/net/gethostbydns.c which now returns as h_errno NO_RECOVERY instead
of TRY_AGAIN. I have implemented an additional debugline which shows this effect
in usr.sbin/ypserv/yp_dnslookup.c.
I don't know where it should be changed; in gethostbydns.c or in yp_dnslookup.c...
Thanks
-Andre
---------------------------------------------------------------------------------
running "ypserv -d -n" using NEW lib/libc/net/gethostbydns.c and querying
for host "pcauth" on PC-NFS client:
root@server:/usr/src/usr.sbin/ypserv>./ypserv -d -n
;; res_setoptions("debug", "env")..
;; debug
ypserv: Procedure ypproc_domain called from 192.168.21.143:1500
ypserv: Procedure ypproc_match called from 192.168.21.143:1500
ypserv: Client is referencing map "hosts.byname".
ypserv: Looking up key [pcauth]
ypserv: Doing DNS lookup of pcauth
;; res_mkquery(0, pcauth, 1, 1)
ypserv: Queueing async DNS name lookup (399)
ypserv: Running dns queue
ypserv: Got dns reply from 192.168.16.33
ypserv: ypserv h_errno = 3
|
This is NO_RECOVERY------+
ypserv: Sending dns reply to 192.168.21.143 (399)
ypserv: Running dns queue
ypserv: Running dns queue
---------------------------------------------------------------------------------
running "ypserv -d -n" using OLD lib/libc/net/gethostbydns.c and querying
for host "pcauth" on PC-NFS client:
root@server:/usr/src/usr.sbin/ypserv>./ypserv -d -n
;; res_setoptions("debug", "env")..
;; debug
ypserv: Procedure ypproc_domain called from 192.168.21.143:1500
ypserv: Procedure ypproc_match called from 192.168.21.143:1500
ypserv: Client is referencing map "hosts.byname".
ypserv: Looking up key [pcauth]
ypserv: Doing DNS lookup of pcauth
;; res_mkquery(0, pcauth, 1, 1)
ypserv: Queueing async DNS name lookup (45885)
ypserv: Running dns queue
ypserv: Got dns reply from 192.168.16.33
ypserv: ypserv h_errno = 2
|
This is TRY_AGAIN -------+
ypserv: Retrying with: pcauth.us.tld
;; res_mkquery(0, pcauth.us.tld, 1, 1)
ypserv: Running dns queue
ypserv: Running dns queue
ypserv: Got dns reply from 192.168.16.33
ypserv: Sending dns reply to 192.168.21.143 (45886)
ypserv: Running dns queue
ypserv: Running dns queue
ypserv: Running dns queue
ypserv: Procedure ypproc_match called from 192.168.21.143:1500
ypserv: Client is referencing map "hosts.byname".
ypserv: Looking up key [printfix.us.tld]
ypserv: Doing DNS lookup of printfix.us.tld
;; res_mkquery(0, printfix.us.tld, 1, 1)
ypserv: Queueing async DNS name lookup (45887)
ypserv: Running dns queue
ypserv: Got dns reply from 192.168.16.33
ypserv: Sending dns reply to 192.168.21.143 (45887)
g
>How-To-Repeat:
run ypserv -n and query an unqualified hostname from a PC-NFS client.
>Fix:
I simply have removed "h_errno == TRY_AGAIN" in usr.sbin/ypserv/yp_dnslookup.c so
it works again.
>Audit-Trail:
>Unformatted:
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199707230432.GAA24951>