Package: nscd
Version: 2.3.5-6
Severity: important
When ssh make a lookup of a node with changed IP-address, nscd returns
the old address. If I stop nscd, ssh get the right address. But as
soon as I start nscd again, the old address is delivered to ssh. All
other applications I've tested get the right address, even when nscd
is running. Applications I've tested includes 'getent hosts', host
and ping.
sid:~> ssh -v bostrom.dyndns.org
OpenSSH_3.8.1p1 Debian-8.sarge.4, OpenSSL 0.9.7g 11 Apr 2005
debug1: Reading configuration data /home/anders/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Connecting to bostrom.dyndns.org [83.250.193.68] port 22.
sid:~> getent hosts bostrom.dyndns.org
83.250.197.26 bostrom.dyndns.org
sid:~> host bostrom.dyndns.org
bostrom.dyndns.org has address 83.250.197.26
sid:~>
strace from ssh:
connect(3, {sa_family=AF_FILE, path="/var/run/nscd/socket"}, 110) = 0
poll([{fd=3, events=POLLOUT|POLLERR|POLLHUP, revents=POLLOUT}], 1, 5000) = 1
writev(3, [{"\2\0\0\0\r\0\0\0\6\0\0\0", 12}, {"hosts\0", 6}], 2) = 18
poll([{fd=3, events=POLLIN|POLLERR|POLLHUP, revents=POLLIN|POLLHUP}], 1, 5000) = 1
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"hosts\0", 6}], msg_controllen=24, {cmsg_len=20, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, {4}}, msg_flags=0}, 0) = 6
fstat(4, {st_mode=S_IFREG|0600, st_size=217016, ...}) = 0
pread(4, "\1\0\0\0h\0\0\0\0\0\0\0\1\0\0\0\255\215\\C\0\0\0\0\323"..., 104, 0) = 104
mmap(NULL, 217016, PROT_READ, MAP_SHARED, 4, 0) = 0x2aaaaaaf8000
close(4) = 0
close(3) = 0
socket(PF_INET, SOCK_STREAM, IPPROTO_TCP) = 3
connect(3, {sa_family=AF_INET, sin_port=htons(22), sin_addr=inet_addr("83.250.193.68")}, 16) = ? ERESTARTSYS (To be restarted)
strace from getent hosts:
connect(3, {sa_family=AF_FILE, path="/var/run/nscd/socket"}, 110) = 0
poll([{fd=3, events=POLLOUT|POLLERR|POLLHUP, revents=POLLOUT}], 1, 5000) = 1
writev(3, [{"\2\0\0\0\r\0\0\0\6\0\0\0", 12}, {"hosts\0", 6}], 2) = 18
poll([{fd=3, events=POLLIN|POLLERR|POLLHUP, revents=POLLIN|POLLHUP}], 1, 5000) = 1
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"hosts\0", 6}], msg_controllen=24, {cmsg_len=20, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, {4}}, msg_flags=0}, 0) = 6
fstat(4, {st_mode=S_IFREG|0600, st_size=217016, ...}) = 0
pread(4, "\1\0\0\0h\0\0\0\0\0\0\0\1\0\0\0\34\221\\C\0\0\0\0\323\0"..., 104, 0) = 104
mmap(NULL, 217016, PROT_READ, MAP_SHARED, 4, 0) = 0x2aaaaaf87000
close(4) = 0
close(3) = 0
fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2aaaaafbc000
write(1, "83.250.197.26 bostrom.dyndns.o"..., 3583.250.197.26 bostrom.dyndns.org
If I remove /var/db/nscd/hosts and restart nscd, ssh works again. But
if I replace /var/db/nscd/hosts with the old db-file again, and
restart nscd, the problem reappear.
The corrupt(?) hosts-file is attached.
/ Anders
-- System Information:
Debian Release: testing/unstable
APT prefers testing
APT policy: (500, 'testing'), (500, 'stable'), (50, 'unstable'), (1, 'sarge-unsupported')
Architecture: amd64 (x86_64)
Shell: /bin/sh linked to /bin/bash
Kernel: Linux 2.6.13.4
Locale: LANG=C, LC_CTYPE=C (charmap=ISO-8859-1) (ignored: LC_ALL set to sv_SE)
Versions of packages nscd depends on:
ii libc6 2.3.5-6 GNU C Library: Shared libraries an
nscd recommends no packages.
-- no debconf information
Attachment:
hosts.bz2
Description: Binary data