Nmap Development: Re: Ncat: socket bind error on Mac OS X

[Kris Katterjohn <katterjohn () gmail com>]

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Dirk Loss wrote:
> Hi,
>
> on Mac OS X 10.5.4 (Intel) Ncat dies with the following error when I try 
> to put it into listening mode:
>
> $ ncat -l 22222
> bind: Invalid argument
>
> Running Ncat as root, switching to UDP or disabling IPv6 in my system 
> preferences did not help. I verified that there is no other process 
> listing on my local TCP port 22222.
Strange.  I don't have access to an OS X box, so I don't have any idea what
could be the problem.

> Apparently the bind() call in sys_wrap.c returns -1 and errno = 22 
> (EINVAL). According to the man page [1], this means that either the 
> "socket is already bound to an address and the protocol does not support 
> binding to a new address" or the "socket may have been shut down."
>
> In client mode Ncat works fine.
>
> Any ideas what I am doing wrong or how I can help debugging?
Can you do an Ncat connect with -vvv and -s (set source addr), and try Nmap
with -S (set source addr) and -sT ?  Errors should all go to stderr, so if
you're going to send me output and you're doing redirection (as opposed to
copy/paste), keep this in mind.

> Regards
> Dirk
Thanks,
Kris Katterjohn

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