https://bugzilla.novell.com/show_bug.cgi?id=822414 https://bugzilla.novell.com/show_bug.cgi?id=822414#c0 Summary: glibc 2.17 dns resolver fails to return query results with _ in the name Classification: openSUSE Product: openSUSE 12.3 Version: Final Platform: x86-64 OS/Version: openSUSE 12.3 Status: NEW Severity: Major Priority: P5 - None Component: Basesystem AssignedTo: bnc-team-screening@forge.provo.novell.com ReportedBy: root+novell@su.lt QAContact: qa-bugs@suse.de Found By: --- Blocker: --- User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/27.0.1453.93 Safari/537.36 Update to 12.3 breaks GLIBC DNS resolving when hostname includes "_" This breaks breaks samba and all other software, using slightly invalid hostnames Reproducible: Always Steps to Reproduce: 1.setup any hostname with _ in it's name (for example samba4 AD DC) 2.make sure /etc/nsswitch.conf containts "hosts: files dns" 3.ping any hostname with _ in it's name (f.e. ._msdcs.<REALM>) 4.nslookup / host / dig the same hostname Actual Results: strace of ping ....... open("/etc/nsswitch.conf", O_RDONLY|O_CLOEXEC) = 4 read(4, "#\n# /etc/n"..., 4096) = 1191 read(4, "", 4096) = 0 open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 4 open("/lib64/libnss_files.so.2", O_RDONLY|O_CLOEXEC) = 4 read(4, "\177ELF\2\1\1\0\0\0"..., 832) = 832 open("/etc/host.conf", O_RDONLY|O_CLOEXEC) = 4 read(4, "#\n# /etc/h"..., 4096) = 370 read(4, "", 4096) = 0 open("/etc/hosts", O_RDONLY|O_CLOEXEC) = 4 read(4, "#\n# hosts "..., 4096) = 1061 read(4, "", 4096) = 0 open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 4 open("/lib64/libnss_dns.so.2", O_RDONLY|O_CLOEXEC) = 4 read(4, "\177ELF\2\1\1\0\0\0"..., 832) = 832 open("/lib64/libresolv.so.2", O_RDONLY|O_CLOEXEC) = 4 read(4, "\177ELF\2\1\1\0\0\0"..., 832) = 832 connect(4, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("127.0.0.1")}, 16) = 0 sendto(4, "\356\35\1\0\0\1\0\0\0\0"..., 80, MSG_NOSIGNAL, NULL, 0) = 80 recvfrom(4, "\356\35\205\200\0\1\0\1\0\1"..., 1024, 0, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("127.0.0.1")}, [16]) = 134 write(2, "ping: unkn"..., 82ping: unknown host 847ce681- nslookup / host / dig work just fine. Expected Results: Successfully resolve the name. When hostname is entered to /etc/hosts - ping works just file. Nothing changes if dns resolver is used first (nsswitchf.conf hosts: dns files) tcpdump shows queries AND responses from DNS server This is probably the libnss_dns.so.2 or libresolv.so.2 fault Not resolving names with _ badly breaks samba ! -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.