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From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4) Gecko/20030529 Description of problem: On RedHat 7.3, 8 and 9, adding "ldap" to the "hosts" DB in "/etc/nsswitch.conf" seems to work _partially_. It's OK for "ping" but not OK for many other apps like "telnet", "ssh". Its OK for "python1" but not OK for "python2". I think it comes from the libc call: "ping" and "python1" use "gethostbyname()", while "telnet" and "python2" use "getaddrinfo()". An interesting case: "getent hosts" lists the hosts defined in the LDAP DB, but a match like "getent hosts <hostname>" returns nothing if <hostname> is defined in LDAP, and does return an answer if <hostname> is defined in "/etc/hosts". Version-Release number of selected component (if applicable): glibc-2.3.2-4.80.6 How reproducible: Always Steps to Reproduce: 1. Configure the hostname resolution to use LDAP. (Put a line "hosts: files dns ldap" in "/etc/nsswitch.conf") 2. Configure two hosts, one beeing resolved with LDAP, the other with the "/etc/hosts" file. (Put a line "192.168.100.26 ldap1 bugzilla" in "/etc/hosts". Put a record for "rx13" in the "ou=Hosts,dc=???,dc=com" LDAP DB. 3. Try to ping and telnet to "bugzilla" and "rx13": |> ping bugzilla |> telnet bugzilla |> ping rx13 |> telnet rx13 Output: |> [olheureu@wks13 olheureu]$ ping rx11 |> PING rx11 (192.168.100.201) from 192.168.100.23 : 56(84) bytes of data. |> 64 bytes from rx11 (192.168.100.201): icmp_seq=1 ttl=255 time=2.56 ms |> 64 bytes from rx11 (192.168.100.201): icmp_seq=2 ttl=255 time=1.85 ms |> |> --- rx11 ping statistics --- |> 2 packets transmitted, 2 received, 0% loss, time 1010ms |> rtt min/avg/max/mdev = 1.856/2.212/2.569/0.359 ms |> [olheureu@wks13 olheureu]$ telnet rx11 |> telnet: rx11: Name or service not known |> rx11: Unknown host |> [olheureu@wks13 olheureu]$ Actual Results: With "bugzilla", ping and telnet find the host. With "rx13", ping find the host but telnet doesn't. Expected Results: "rx13" beeing found by telnet as it is by ping. Additional info: This bug may be correlated with bug 54646. Because Posix says "gethostbyname()" is obsolete and should be replaced by "getaddrinfo()", I guess more and more apps will use "getaddrinfo()" in the future.
I tried to reproduce the problem with a RHL9 installation (the oldest I have in the network with the LDAP server) but couldn't get nss_ldap to work. Don't know what up with it. But the RHEL3 and Fedora Core test 2 code works fine. With or without getaddrinfo. If you have FC test2, try getent ahosts <HOST> where <HOST> is the name only available through LDAP. I do not think spending much time on this for back releases is worth it. We haven't received any further complaints which might indicate that this functionality actually works. In fact, this is what I expect since getaddrinfo in those releases simply calls the gethostbyname2 function. If you want to investigate old release please run strace -o /tmp/SOMETMPFILE getent hosts <HOST> and attach the /TMP/SOMETMPFILE to this bug. Then use a program which calls getaddrinfo (ideally, write a little program yourself) and run it with ltrace PROGRAM and then strace -o /tmp/ANOTHERFILE PROGRAM
No response in a month. I don't see a bug. Closing now.