The netcat from [extra] didnot connect to any other machine but can accept connection from others.
I traced the program and found netcat_flag_count() in flagset.c returned error.
I also googled and found a patch from OpenWRT, and it works fine now!
$this->bbcode_second_pass_code('', 'Index: netcat-0.7.1/src/flagset.c
===================================================================
--- netcat-0.7.1.orig/src/flagset.c 2009-02-06 19:56:01.000000000 +0100
+++ netcat-0.7.1/src/flagset.c 2009-02-06 19:56:13.000000000 +0100
@@ -134,7 +134,7 @@
int netcat_flag_count(void)
{
- register char c;
+ register unsigned char c;
register int i;
int ret = 0;
@@ -154,7 +154,7 @@
Assumed that the bit number 1 is the sign, and that we will shift the
bit 1 (or the bit that takes its place later) until the the most right,
WHY it has to keep the wrong sign? */
- ret -= (c >> 7);
+ ret += (c >> 7);
c <<= 1;
}
}
')
https://dev.openwrt.org/browser/packages/net/netcat/patches/001-netcat_flag_count.patch