Package: netcat6
Version: 1.0-8
If sending data to a remote server that does not read data but only
sends some and then closes the connection, nc6 (unlike nc.traditional
and nc.openbsd) most of the time discards data is already has read:
socket(PF_INET6, SOCK_STREAM, IPPROTO_TCP) = 3
setsockopt(3, SOL_IPV6, IPV6_V6ONLY, [1], 4) = 0
setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
fcntl(3, F_GETFL) = 0x2 (flags O_RDWR)
fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0
connect(3, {sa_family=AF_INET6, sin6_port=htons(9765), inet_pton(AF_INET6,
"::1", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, 28) = -1 EINPROGRESS
(Operation now in progress)
select(4, NULL, [3], NULL, NULL) = 1 (out [3])
getsockopt(3, SOL_SOCKET, SO_ERROR, [0], [4]) = 0
dup(0) = 4
dup(1) = 5
select(5, [3 4], [], NULL, NULL) = 1 (in [4])
readv(4,
[{"\n\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"...,
8192}], 1) = 1
select(5, [3 4], [3], NULL, NULL) = 1 (out [3])
writev(3, [{"\n", 1}], 1) = 1
select(5, [3 4], [], NULL, NULL) = 1 (in [3])
readv(3, [{"test\n\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192}], 1) = 5
select(6, [3 4], [5], NULL, NULL) = 2 (in [3], out [5])
readv(3, 0x7fff4d332d20, 1) = -1 ECONNRESET (Connection reset by
peer)
close(4) = 0
close(5) = 0
close(3) = 0
exit_group(1) = ?
As you can see, it read 5 bytes, but never outputs them.
It should either output them (like nc.traditional and nc.openbsd) or at least
give some feedback that it may discard stuff (one needs nc6 -vv to get
anything but a silent end with only the exit code giving some hint).
Bernhard R. Link
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