Date: Fri, 29 Sep 2000 23:02:37 -0700 (PDT) From: mzaki@e-mail.ne.jp To: freebsd-gnats-submit@FreeBSD.org Subject: bin/21658: The combination of dhclient & WinNT server makes resolv.conf useless Message-ID: <20000930060237.1C4B337B66C@hub.freebsd.org>
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>Number: 21658
>Category: bin
>Synopsis: The combination of dhclient & WinNT server makes resolv.conf useless
>Confidential: no
>Severity: serious
>Priority: high
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Fri Sep 29 23:10:01 PDT 2000
>Closed-Date:
>Last-Modified:
>Originator: Motomichi Matsuzaki
>Release: FreeBSD 5.0-CURRENT
>Organization:
>Environment:
FreeBSD localhost 5.0-CURRENT FreeBSD 5.0-CURRENT #9: Fri Sep 29 20:10:03 JST 2000 root@localhost:/usr/obj/usr/src/sys/WORK i386
>Description:
As servicing DHCP on Windows NT,
dhclient received the domain name and setting weirdly to /etc/resolv.conf
For example:
search mzaki.nom\000
nameserver 192.168.177.2
>How-To-Repeat:
setup Windows NT as DHCP server,
run dhclient on FreeBSD,
see /etc/resolv.conf
>Fix:
RFC2132 says:
Options containing NVT ASCII data SHOULD NOT include a trailing NULL;
however, the receiver of such options MUST be prepared to delete
trailing nulls if they exist.
(RFC2132 2. BOOTP Extension/DHCP Option Field Format)
isc-dhcp 2.0pl5 client seems to violate this.
If server send domain name with a trailing NULL as follows,
0f 0a 6d 7a 61 6b 69 2e 6e 6f 6d 00
| | |
| | value: mzaki.nom\0 ( this '\0' stands for NUL character )
| length: 10
tag: Domain Name
pretty_print_option() in common/options.c translates this into
mzaki.nom\000
and turns over to client script.
ad hoc patch is:
--- common/options.c Sat Jun 24 16:24:02 2000
+++ /home/mzaki/options.c Mon Sep 11 23:08:56 2000
@@ -551,6 +551,7 @@
if (emit_quotes)
*op++ = '"';
for (; dp < data + len; dp++) {
+ if (*dp == '\0') continue;
if (!isascii (*dp) ||
!isprint (*dp)) {
sprintf (op, "\\%03o",
>Release-Note:
>Audit-Trail:
>Unformatted:
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