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Bug#343140: marked as done (resolver uses the search list before other address families)

Your message dated Thu, 04 Sep 2008 10:46:12 +0000
with message-id <3913881719.20080904104338@bngclub.org>
and subject line Smurfs turrn 500, Belgium celebrates
has caused the Debian Bug report #343140,
regarding resolver uses the search list before other address families
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact owner@bugs.debian.org
immediately.)


-- 
343140: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=343140
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: libc6
Version: 2.3.2.ds1-22
Severity: important

I originally posted a bug report for postfix detailing the problem but I
can reproduce the bug outside of postfix.  Here's the postfix bug
report in case you're interested:

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=314891

In a nutshell, when using 'search' lines in /etc/resolv.conf, the
resolver always appends listed search domains to a hostname lookup even
when the host being searched is fully-qualified (contains one or more dots).
This results in a LOT of needless DNS traffic.  On a busy mail server,
it makes using the 'search' lines extremely expensive (because DNS traffic
increases exponentially).

Here's an strace of 'telnet mx1.hotmail.com 25'.  Oddly, it seems to do
the right thing initially but the fully-qualified lookup must always
fail, resulting in subsequent lookups using the search list.

$ cat /etc/resolv.conf
nameserver 69.51.81.36
nameserver 69.51.78.68
search ul.aspextra.net aspextra.net

$ strace telnet mx1.hotmail.com 25
...
open("/etc/resolv.conf", O_RDONLY)      = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=274, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40018000
read(3, "# Dynamic resolv.conf(5) file fo"..., 4096) = 274
read(3, "", 4096)                       = 0
close(3)                                = 0
munmap(0x40018000, 4096)                = 0
socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 3
connect(3, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("69.51.81.36")}, 28) = 0
send(3, "\n\177\1\0\0\1\0\0\0\0\0\0\3mx1\7hotmail\3com\0\0\34\0"..., 33, 0) = 33
gettimeofday({1134449292, 353764}, NULL) = 0
poll([{fd=3, events=POLLIN, revents=POLLIN}], 1, 5000) = 1
ioctl(3, FIONREAD, [98])                = 0
recvfrom(3, "\n\177\201\200\0\1\0\0\0\1\0\0\3mx1\7hotmail\3com\0\0\34"..., 1024, 0, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("69.51.81.36")}, [16]) = 98
close(3)                                = 0
socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 3
connect(3, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("69.51.81.36")}, 28) = 0
send(3, "\n\200\1\0\0\1\0\0\0\0\0\0\3mx1\7hotmail\3com\2ul\10"..., 49, 0) = 49
gettimeofday({1134449292, 357407}, NULL) = 0
poll([{fd=3, events=POLLIN, revents=POLLIN}], 1, 5000) = 1
ioctl(3, FIONREAD, [49])                = 0
recvfrom(3, "\n\200\201\205\0\1\0\0\0\0\0\0\3mx1\7hotmail\3com\2ul\10"..., 1024, 0, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("69.51.81.36")}, [16]) = 49
close(3)                                = 0
socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 3
connect(3, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("69.51.78.68")}, 28) = 0
send(3, "\n\200\1\0\0\1\0\0\0\0\0\0\3mx1\7hotmail\3com\2ul\10"..., 49, 0) = 49
gettimeofday({1134449292, 361191}, NULL) = 0
poll([{fd=3, events=POLLIN, revents=POLLIN}], 1, 3000) = 1
ioctl(3, FIONREAD, [100])               = 0
recvfrom(3, "\n\200\201\203\0\1\0\0\0\1\0\0\3mx1\7hotmail\3com\2ul\10"..., 1024, 0, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("69.51.78.68")}, [16]) = 100
close(3)                                = 0
socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 3
connect(3, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("69.51.81.36")}, 28) = 0
send(3, "\n\201\1\0\0\1\0\0\0\0\0\0\3mx1\7hotmail\3com\10asp"..., 46, 0) = 46
gettimeofday({1134449292, 364427}, NULL) = 0
poll([{fd=3, events=POLLIN, revents=POLLIN}], 1, 5000) = 1
ioctl(3, FIONREAD, [97])                = 0
recvfrom(3, "\n\201\201\203\0\1\0\0\0\1\0\0\3mx1\7hotmail\3com\10as"..., 1024, 0, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("69.51.81.36")}, [16]) = 97
close(3)                                = 0
socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 3
connect(3, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("69.51.81.36")}, 28) = 0
send(3, "\n\202\1\0\0\1\0\0\0\0\0\0\3mx1\7hotmail\3com\0\0\1\0"..., 33, 0) = 33
gettimeofday({1134449292, 367710}, NULL) = 0
poll([{fd=3, events=POLLIN, revents=POLLIN}], 1, 5000) = 1
ioctl(3, FIONREAD, [195])               = 0
recvfrom(3, "\n\202\201\200\0\1\0\4\0\5\0\0\3mx1\7hotmail\3com\0\0\1"..., 1024, 0, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("69.51.81.36")}, [16]) = 195
close(3)                                = 0
socket(PF_FILE, SOCK_STREAM, 0)         = 3
connect(3, {sa_family=AF_FILE, path="/var/run/.nscd_socket"}, 110) = -1 ENOENT (No such file or directory)
close(3)                                = 0
gettimeofday({1134449292, 371589}, NULL) = 0
getpid()                                = 15269
open("/etc/resolv.conf", O_RDONLY)      = 3
...


-- System Information:
Debian Release: 3.1
Architecture: i386 (i686)
Kernel: Linux 2.6.8-2-686-smp
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)

Versions of packages libc6 depends on:
ii  libdb1-compat                 2.1.3-7    The Berkeley database routines [gl

-- no debconf information

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