Hello,
I ran into this as well, and after some investigation I found out this
only happens when using the verbose flag "-v":
netcat.c, lines 609-616:
----------------------------%<-------------------------------------------------
if (vflag) {
/* For UDP, make sure we are connected. */
if (uflag) {
if (udptest(s) == -1) {
ret = 1;
continue;
}
}
----------------------------%<-------------------------------------------------
netcat.c, lines 1207-1229:
----------------------------%<-------------------------------------------------
/*
* udptest()
* Do a few writes to see if the UDP port is there.
* Fails once PF state table is full.
*/
int
udptest(int s)
{
int i, t;
if ((write(s, "X", 1) != 1) ||
((write(s, "X", 1) != 1) && (errno == ECONNREFUSED)))
return -1;
/* Give the remote host some time to reply. */
for (i = 0, t = (timeout == -1) ? UDP_SCAN_TIMEOUT : (timeout / 1000);
i < t; i++) {
sleep(1);
if ((write(s, "X", 1) != 1) && (errno == ECONNREFUSED))
return -1;
}
return 1;
}
----------------------------%<-------------------------------------------------
So I believe it can be cured with a simple "don't do it!"[1] :-)
-Christian
[1] - Doctor, doctor, when I touch my arm here, it hurts!
- Well, don't touch it then!
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