First, to answer your questions:
- ping is netkit-ping 0.10-10.3.
- a full strace of the failing ping (as root) is below
My own theory:
- It is not a problem with ping, other programs fail as well.
- It fails after trying to send to 224.0.0.251. This is a multicast
address. My name server is at 127.0.0.1. So it is not the usual
UDP packet to the name server, but one by libnss-mdns.
- The sendmsg call probably fails because of some firewall rule which
prohibits multicast UDP.
- Instead of failing this attempt and continuing with the usual "dns"
method the whole name resolution process fails -- this is the bug.
Walter
execve("/bin/ping", ["ping", "www.google.com"], [/* 46 vars */]) = 0
uname({sys="Linux", node="gimli", ...}) = 0
brk(0) = 0x805d000
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0xb7f7d000
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0xb7f7c000
open("/etc/ld.so.cache", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=103782, ...}) = 0
mmap2(NULL, 103782, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7f62000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/tls/libc.so.6", O_RDONLY) = 3
read(3,
"\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\240O\1\0004\0\0\0<\370\22\0\0\0\0\0004\0
\0\n\0(\0>[EMAIL PROTECTED]@\1\0\0\5\0\0\0\4\0\0\0\3\0\0\0\300c\22\0\300"...,
512) = 512
fstat64(3, {st_mode=S_IFREG|0644, st_size=1245676, ...}) = 0
mmap2(NULL, 1251484, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) =
0xb7e30000
mmap2(0xb7f58000, 28672, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x128) = 0xb7f58000
mmap2(0xb7f5f000, 10396, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xb7f5f000
close(3) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0xb7e2f000
mprotect(0xb7f58000, 20480, PROT_READ) = 0
set_thread_area({entry_number:-1 -> 6, base_addr:0xb7e2f6c0, limit:1048575,
seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0,
useable:1}) = 0
munmap(0xb7f62000, 103782) = 0
getuid32() = 0
brk(0) = 0x805d000
brk(0x807e000) = 0x807e000
open("/etc/nsswitch.conf", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=530, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0xb7f7b000
read(3, "# /etc/nsswitch.conf\n#\n# Example configuration of GNU Name Service
Switch functionality.\n# If you ha"..., 4096) = 530
read(3, "", 4096) = 0
close(3) = 0
munmap(0xb7f7b000, 4096) = 0
open("/etc/ld.so.cache", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=103782, ...}) = 0
mmap2(NULL, 103782, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7f62000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/tls/i686/cmov/libnss_db.so.2", O_RDONLY) = -1 ENOENT (No such file
or directory)
stat64("/lib/tls/i686/cmov", 0xbfd8f46c) = -1 ENOENT (No such file or directory)
open("/lib/tls/i686/libnss_db.so.2", O_RDONLY) = -1 ENOENT (No such file or
directory)
stat64("/lib/tls/i686", 0xbfd8f46c) = -1 ENOENT (No such file or directory)
open("/lib/tls/cmov/libnss_db.so.2", O_RDONLY) = -1 ENOENT (No such file or
directory)
stat64("/lib/tls/cmov", 0xbfd8f46c) = -1 ENOENT (No such file or directory)
open("/lib/tls/libnss_db.so.2", O_RDONLY) = -1 ENOENT (No such file or
directory)
stat64("/lib/tls", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
open("/lib/i686/cmov/libnss_db.so.2", O_RDONLY) = -1 ENOENT (No such file or
directory)
stat64("/lib/i686/cmov", 0xbfd8f46c) = -1 ENOENT (No such file or directory)
open("/lib/i686/libnss_db.so.2", O_RDONLY) = -1 ENOENT (No such file or
directory)
stat64("/lib/i686", 0xbfd8f46c) = -1 ENOENT (No such file or directory)
open("/lib/cmov/libnss_db.so.2", O_RDONLY) = -1 ENOENT (No such file or
directory)
stat64("/lib/cmov", 0xbfd8f46c) = -1 ENOENT (No such file or directory)
open("/lib/libnss_db.so.2", O_RDONLY) = -1 ENOENT (No such file or directory)
stat64("/lib", {st_mode=S_IFDIR|0755, st_size=12288, ...}) = 0
open("/usr/lib/tls/i686/cmov/libnss_db.so.2", O_RDONLY) = -1 ENOENT (No such
file or directory)
stat64("/usr/lib/tls/i686/cmov", 0xbfd8f46c) = -1 ENOENT (No such file or
directory)
open("/usr/lib/tls/i686/libnss_db.so.2", O_RDONLY) = -1 ENOENT (No such file or
directory)
stat64("/usr/lib/tls/i686", 0xbfd8f46c) = -1 ENOENT (No such file or directory)
open("/usr/lib/tls/cmov/libnss_db.so.2", O_RDONLY) = -1 ENOENT (No such file or
directory)
stat64("/usr/lib/tls/cmov", 0xbfd8f46c) = -1 ENOENT (No such file or directory)
open("/usr/lib/tls/libnss_db.so.2", O_RDONLY) = -1 ENOENT (No such file or
directory)
stat64("/usr/lib/tls", 0xbfd8f46c) = -1 ENOENT (No such file or directory)
open("/usr/lib/i686/cmov/libnss_db.so.2", O_RDONLY) = -1 ENOENT (No such file
or directory)
stat64("/usr/lib/i686/cmov", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
open("/usr/lib/i686/libnss_db.so.2", O_RDONLY) = -1 ENOENT (No such file or
directory)
stat64("/usr/lib/i686", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
open("/usr/lib/cmov/libnss_db.so.2", O_RDONLY) = -1 ENOENT (No such file or
directory)
stat64("/usr/lib/cmov", 0xbfd8f46c) = -1 ENOENT (No such file or directory)
open("/usr/lib/libnss_db.so.2", O_RDONLY) = -1 ENOENT (No such file or
directory)
stat64("/usr/lib", {st_mode=S_IFDIR|0755, st_size=135168, ...}) = 0
open("/lib/i486-linux-gnu/tls/i686/cmov/libnss_db.so.2", O_RDONLY) = -1 ENOENT
(No such file or directory)
stat64("/lib/i486-linux-gnu/tls/i686/cmov", 0xbfd8f46c) = -1 ENOENT (No such
file or directory)
open("/lib/i486-linux-gnu/tls/i686/libnss_db.so.2", O_RDONLY) = -1 ENOENT (No
such file or directory)
stat64("/lib/i486-linux-gnu/tls/i686", 0xbfd8f46c) = -1 ENOENT (No such file or
directory)
open("/lib/i486-linux-gnu/tls/cmov/libnss_db.so.2", O_RDONLY) = -1 ENOENT (No
such file or directory)
stat64("/lib/i486-linux-gnu/tls/cmov", 0xbfd8f46c) = -1 ENOENT (No such file or
directory)
open("/lib/i486-linux-gnu/tls/libnss_db.so.2", O_RDONLY) = -1 ENOENT (No such
file or directory)
stat64("/lib/i486-linux-gnu/tls", 0xbfd8f46c) = -1 ENOENT (No such file or
directory)
open("/lib/i486-linux-gnu/i686/cmov/libnss_db.so.2", O_RDONLY) = -1 ENOENT (No
such file or directory)
stat64("/lib/i486-linux-gnu/i686/cmov", 0xbfd8f46c) = -1 ENOENT (No such file
or directory)
open("/lib/i486-linux-gnu/i686/libnss_db.so.2", O_RDONLY) = -1 ENOENT (No such
file or directory)
stat64("/lib/i486-linux-gnu/i686", 0xbfd8f46c) = -1 ENOENT (No such file or
directory)
open("/lib/i486-linux-gnu/cmov/libnss_db.so.2", O_RDONLY) = -1 ENOENT (No such
file or directory)
stat64("/lib/i486-linux-gnu/cmov", 0xbfd8f46c) = -1 ENOENT (No such file or
directory)
open("/lib/i486-linux-gnu/libnss_db.so.2", O_RDONLY) = -1 ENOENT (No such file
or directory)
stat64("/lib/i486-linux-gnu", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
open("/usr/lib/i486-linux-gnu/tls/i686/cmov/libnss_db.so.2", O_RDONLY) = -1
ENOENT (No such file or directory)
stat64("/usr/lib/i486-linux-gnu/tls/i686/cmov", 0xbfd8f46c) = -1 ENOENT (No
such file or directory)
open("/usr/lib/i486-linux-gnu/tls/i686/libnss_db.so.2", O_RDONLY) = -1 ENOENT
(No such file or directory)
stat64("/usr/lib/i486-linux-gnu/tls/i686", 0xbfd8f46c) = -1 ENOENT (No such
file or directory)
open("/usr/lib/i486-linux-gnu/tls/cmov/libnss_db.so.2", O_RDONLY) = -1 ENOENT
(No such file or directory)
stat64("/usr/lib/i486-linux-gnu/tls/cmov", 0xbfd8f46c) = -1 ENOENT (No such
file or directory)
open("/usr/lib/i486-linux-gnu/tls/libnss_db.so.2", O_RDONLY) = -1 ENOENT (No
such file or directory)
stat64("/usr/lib/i486-linux-gnu/tls", 0xbfd8f46c) = -1 ENOENT (No such file or
directory)
open("/usr/lib/i486-linux-gnu/i686/cmov/libnss_db.so.2", O_RDONLY) = -1 ENOENT
(No such file or directory)
stat64("/usr/lib/i486-linux-gnu/i686/cmov", 0xbfd8f46c) = -1 ENOENT (No such
file or directory)
open("/usr/lib/i486-linux-gnu/i686/libnss_db.so.2", O_RDONLY) = -1 ENOENT (No
such file or directory)
stat64("/usr/lib/i486-linux-gnu/i686", 0xbfd8f46c) = -1 ENOENT (No such file or
directory)
open("/usr/lib/i486-linux-gnu/cmov/libnss_db.so.2", O_RDONLY) = -1 ENOENT (No
such file or directory)
stat64("/usr/lib/i486-linux-gnu/cmov", 0xbfd8f46c) = -1 ENOENT (No such file or
directory)
open("/usr/lib/i486-linux-gnu/libnss_db.so.2", O_RDONLY) = -1 ENOENT (No such
file or directory)
stat64("/usr/lib/i486-linux-gnu", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
munmap(0xb7f62000, 103782) = 0
open("/etc/ld.so.cache", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=103782, ...}) = 0
mmap2(NULL, 103782, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7f62000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/tls/libnss_files.so.2", O_RDONLY) = 3
read(3,
"\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\200\33\0\0004\0\0\0\254\221\0\0\0\0\0\0004\0
\0\10\0(\0\33\0\32\0\6\0\0\0004\0\0\0004\0\0\0004\0\0\0\0\1\0\0\0\1\0\0\5\0\0\0\4\0\0\0\3\0\0\0\203"...,
512) = 512
fstat64(3, {st_mode=S_IFREG|0644, st_size=38372, ...}) = 0
mmap2(NULL, 41620, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) =
0xb7e24000
mmap2(0xb7e2d000, 8192, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x8) = 0xb7e2d000
close(3) = 0
munmap(0xb7f62000, 103782) = 0
open("/etc/protocols", O_RDONLY) = 3
fcntl64(3, F_GETFD) = 0
fcntl64(3, F_SETFD, FD_CLOEXEC) = 0
fstat64(3, {st_mode=S_IFREG|0644, st_size=2478, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0xb7f7b000
read(3, "# Internet (IP) protocols\n#\n# Updated from
http://www.iana.org/assignments/protocol-numbers and othe"..., 4096) = 2478
close(3) = 0
munmap(0xb7f7b000, 4096) = 0
socket(PF_INET, SOCK_RAW, IPPROTO_ICMP) = 3
getuid32() = 0
setuid32(0) = 0
gettimeofday({1160852279, 292543}, NULL) = 0
getpid() = 24040
open("/etc/resolv.conf", O_RDONLY) = 4
fstat64(4, {st_mode=S_IFREG|0644, st_size=34, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0xb7f7b000
read(4, "search local\nnameserver 127.0.0.1\n", 4096) = 34
read(4, "", 4096) = 0
close(4) = 0
munmap(0xb7f7b000, 4096) = 0
socket(PF_FILE, SOCK_STREAM, 0) = 4
fcntl64(4, F_GETFL) = 0x2 (flags O_RDWR)
fcntl64(4, F_SETFL, O_RDWR|O_NONBLOCK) = 0
connect(4, {sa_family=AF_FILE, path="/var/run/nscd/socket"}, 110) = -1 ENOENT
(No such file or directory)
close(4) = 0
socket(PF_FILE, SOCK_STREAM, 0) = 4
fcntl64(4, F_GETFL) = 0x2 (flags O_RDWR)
fcntl64(4, F_SETFL, O_RDWR|O_NONBLOCK) = 0
connect(4, {sa_family=AF_FILE, path="/var/run/nscd/socket"}, 110) = -1 ENOENT
(No such file or directory)
close(4) = 0
open("/etc/host.conf", O_RDONLY) = 4
fstat64(4, {st_mode=S_IFREG|0644, st_size=9, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0xb7f7b000
read(4, "multi on\n", 4096) = 9
read(4, "", 4096) = 0
close(4) = 0
munmap(0xb7f7b000, 4096) = 0
open("/etc/hosts", O_RDONLY) = 4
fcntl64(4, F_GETFD) = 0
fcntl64(4, F_SETFD, FD_CLOEXEC) = 0
fstat64(4, {st_mode=S_IFREG|0644, st_size=519, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0xb7f7b000
read(4, "127.0.0.1\tlocalhost\n\n\n# The following lines are desirable for IPv6
capable hosts\n# (added automatica"..., 4096) = 519
read(4, "", 4096) = 0
close(4) = 0
munmap(0xb7f7b000, 4096) = 0
open("/etc/ld.so.cache", O_RDONLY) = 4
fstat64(4, {st_mode=S_IFREG|0644, st_size=103782, ...}) = 0
mmap2(NULL, 103782, PROT_READ, MAP_PRIVATE, 4, 0) = 0xb7f62000
close(4) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/usr/lib/libnss_mdns4_minimal.so.2", O_RDONLY) = 4
read(4,
"\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\360\26\0\0004\0\0\0\324R\0\0\0\0\0\0004\0
\0\5\0(\0\30\0\27\0\1\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\324O\0\0\324O\0\0\5\0\0\0\0\20\0\0\1\0\0\0\0P\0\0"...,
512) = 512
fstat64(4, {st_mode=S_IFREG|0644, st_size=22164, ...}) = 0
mmap2(NULL, 21024, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 4, 0) =
0xb7e1e000
mmap2(0xb7e23000, 4096, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 4, 0x5) = 0xb7e23000
close(4) = 0
munmap(0xb7f62000, 103782) = 0
open("/etc/resolv.conf", O_RDONLY) = 4
fstat64(4, {st_mode=S_IFREG|0644, st_size=34, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0xb7f7b000
read(4, "search local\nnameserver 127.0.0.1\n", 4096) = 34
read(4, "", 4096) = 0
close(4) = 0
munmap(0xb7f7b000, 4096) = 0
socket(PF_FILE, SOCK_STREAM, 0) = 4
fcntl64(4, F_GETFD) = 0
fcntl64(4, F_SETFD, FD_CLOEXEC) = 0
connect(4, {sa_family=AF_FILE, path="/var/run/avahi-daemon/socket"}, 110) = -1
ENOENT (No such file or directory)
close(4) = 0
socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 4
setsockopt(4, SOL_IP, IP_MULTICAST_TTL, [255], 4) = 0
bind(4, {sa_family=AF_INET, sin_port=htons(0), sin_addr=inet_addr("0.0.0.0")},
16) = 0
setsockopt(4, SOL_IP, IP_RECVTTL, [1], 4) = 0
setsockopt(4, SOL_IP, IP_PKTINFO, [1], 4) = 0
fcntl64(4, F_GETFD) = 0
fcntl64(4, F_SETFD, FD_CLOEXEC) = 0
fcntl64(4, F_GETFL) = 0x2 (flags O_RDWR)
fcntl64(4, F_SETFL, O_RDWR|O_NONBLOCK) = 0
open("/etc/resolv.conf", O_RDONLY) = 5
fstat64(5, {st_mode=S_IFREG|0644, st_size=34, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0xb7f7b000
read(5, "search local\nnameserver 127.0.0.1\n", 4096) = 34
read(5, "", 4096) = 0
close(5) = 0
munmap(0xb7f7b000, 4096) = 0
open("/dev/urandom", O_RDONLY) = 5
read(5, "\202\371", 2) = 2
close(5) = 0
ioctl(4, SIOCGIFCONF, {192, {{"lo", {AF_INET, inet_addr("127.0.0.1")}},
{"eth0", {AF_INET, inet_addr("192.168.4.1")}}, {"wlan0", {AF_INET,
inet_addr("192.168.1.1")}}, {"vmnet1", {AF_INET, inet_addr("172.16.160.1")}},
{"vmnet8", {AF_INET, inet_addr("192.168.215.1")}}, {"ppp0", {AF_INET,
inet_addr("84.57.73.235")}}}}) = 0
ioctl(4, SIOCGIFFLAGS, {ifr_name="eth0",
ifr_flags=IFF_UP|IFF_BROADCAST|IFF_MULTICAST}) = 0
ioctl(4, SIOCGIFFLAGS, {ifr_name="wlan0",
ifr_flags=IFF_UP|IFF_BROADCAST|IFF_RUNNING|IFF_MULTICAST}) = 0
ioctl(4, SIOCGIFINDEX, {ifr_name="wlan0", ifr_index=3}) = 0
sendmsg(4, {msg_name(16)={sa_family=AF_INET, sin_port=htons(5353),
sin_addr=inet_addr("224.0.0.251")},
msg_iov(1)=[{"\371\202\0\0\0\1\0\0\0\0\0\0\3www\6google\3com\5local\0\0\1\0\1",
38}], msg_controllen=24, {cmsg_len=24, cmsg_level=SOL_IP, cmsg_type=, ...},
msg_flags=0}, MSG_DONTROUTE) = -1 EPERM (Operation not permitted)
close(4) = 0
write(2, "ping: unknown host www.google.com\n", 34ping: unknown host
www.google.com
) = 34
exit_group(2) = ?
Process 24040 detached
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