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netcat usage.
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Peter Easthope
Feb 23, 2014, 1:10:02 PM2/23/14
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Can anyone offer a solution for this?
[user@computer ~]$ nc -l 25 -e /usr/sbin/ssmtp
Ncat: bind to :::25: Permission denied. QUITTING.
Thanks, ... Peter E.
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[user@computer ~]$ nc -l 25 -e /usr/sbin/ssmtp
Ncat: bind to :::25: Permission denied. QUITTING.
Thanks, ... Peter E.
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Mark Carroll
Feb 23, 2014, 1:20:03 PM2/23/14
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"Peter Easthope" <pe...@easthope.ca> writes:
> Can anyone offer a solution for this?
>
> [user@computer ~]$ nc -l 25 -e /usr/sbin/ssmtp
> Ncat: bind to :::25: Permission denied. QUITTING.
Maybe you need to be root? I doubt regular users can bind to ports below
> Can anyone offer a solution for this?
>
> [user@computer ~]$ nc -l 25 -e /usr/sbin/ssmtp
> Ncat: bind to :::25: Permission denied. QUITTING.
1024.
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Brian
Feb 23, 2014, 2:50:01 PM2/23/14
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On Sun 23 Feb 2014 at 09:15:59 -0800, Peter Easthope wrote:
> Can anyone offer a solution for this?
>
> [user@computer ~]$ nc -l 25 -e /usr/sbin/ssmtp
> Ncat: bind to :::25: Permission denied. QUITTING.
Which netcat are you using? Mine (which I will not reveal :) ) does does
> Can anyone offer a solution for this?
>
> [user@computer ~]$ nc -l 25 -e /usr/sbin/ssmtp
> Ncat: bind to :::25: Permission denied. QUITTING.
not offer -e as an option.
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David Glover-Aoki
Feb 23, 2014, 4:10:01 PM2/23/14
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On Sun, 23 Feb 2014 09:15:59 -0800
"Peter Easthope" <pe...@easthope.ca> wrote:
> Ncat: bind to :::25: Permission denied. QUITTING.
Only the superuser can bind to ports below 1024.
"Peter Easthope" <pe...@easthope.ca> wrote:
> Ncat: bind to :::25: Permission denied. QUITTING.
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Pascal Hambourg
Feb 23, 2014, 6:40:01 PM2/23/14
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David Glover-Aoki a écrit :
CAP_NET_BIND_SERVICE capability.
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>
> Only the superuser can bind to ports below 1024.
Actually not. It just requires that the process has the
> Only the superuser can bind to ports below 1024.
CAP_NET_BIND_SERVICE capability.
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Peter Easthope
Feb 24, 2014, 12:50:02 AM2/24/14
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References: <a7f1e371d326618f1b48...@easthope.ca>
<530A9882...@gmail.com>
From: Scott Ferguson <scott.ferguso...@gmail.com>
Date: Mon, 24 Feb 2014 11:55:30 +1100
> NOTE: there four different "netcats" available in Wheezy.
I found three.
netcat-openbsd, netcat-traditional, netcat6.
netcat-openbsd pleads ignorance.
peter@dalton:~$ nc -l 25 -e ssmtp
nc: invalid option -- 'e'
...
netcat-traditional listens on the port; or appears to and does nothing.
peter@dalton:~$ nc -l 25 -e ssmtp
[gears humming]
netcat6 refuses.
peter@dalton:~$ nc -l -p 25 -e ssmtp
nc: bind to source :: 25 failed: Permission denied
nc: bind to source 0.0.0.0 25 failed: Permission denied
nc: failed to bind to any local addr/port
From: Brian <ad...@cityscape.co.uk>
Date: Sun, 23 Feb 2014 23:17:04 +0000
> You start a thread. You then respond to it and break the thread.
> Do you do this by design?
The browser doesn't have a means to include References in the header.
Sorry. References are at the top of the message and I can include
References in the header when mail is working again. More explanation here.
https://wiki.debian.org/DebianMailingLists#Message_Threading_and_Replying
From: Pascal Hambourg <pas...@plouf.fr.eu.org>
Date: Mon, 24 Feb 2014 00:22:10 +0100
[Binding to a port below 1024] just requires that the process has the
CAP_NET_BIND_SERVICE capability.
Thanks. With that tip I might make nc in netcat6 work.
Regards, ... Peter E.
<530A9882...@gmail.com>
From: Scott Ferguson <scott.ferguso...@gmail.com>
Date: Mon, 24 Feb 2014 11:55:30 +1100
> NOTE: there four different "netcats" available in Wheezy.
I found three.
netcat-openbsd, netcat-traditional, netcat6.
netcat-openbsd pleads ignorance.
peter@dalton:~$ nc -l 25 -e ssmtp
nc: invalid option -- 'e'
...
netcat-traditional listens on the port; or appears to and does nothing.
peter@dalton:~$ nc -l 25 -e ssmtp
[gears humming]
netcat6 refuses.
peter@dalton:~$ nc -l -p 25 -e ssmtp
nc: bind to source :: 25 failed: Permission denied
nc: bind to source 0.0.0.0 25 failed: Permission denied
nc: failed to bind to any local addr/port
From: Brian <ad...@cityscape.co.uk>
Date: Sun, 23 Feb 2014 23:17:04 +0000
> You start a thread. You then respond to it and break the thread.
> Do you do this by design?
The browser doesn't have a means to include References in the header.
Sorry. References are at the top of the message and I can include
References in the header when mail is working again. More explanation here.
https://wiki.debian.org/DebianMailingLists#Message_Threading_and_Replying
From: Pascal Hambourg <pas...@plouf.fr.eu.org>
Date: Mon, 24 Feb 2014 00:22:10 +0100
[Binding to a port below 1024] just requires that the process has the
CAP_NET_BIND_SERVICE capability.
Regards, ... Peter E.
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Scott Ferguson
Feb 24, 2014, 4:10:02 AM2/24/14
to
On 24/02/14 15:44, Peter Easthope wrote:
> References: <a7f1e371d326618f1b48...@easthope.ca>
> <530A9882...@gmail.com>
>
> From: Scott Ferguson <scott.ferguso...@gmail.com>
> Date: Mon, 24 Feb 2014 11:55:30 +1100
>> NOTE: there four different "netcats" available in Wheezy.
>
> I found three.
> netcat-openbsd, netcat-traditional, netcat6.
OK. I miscounted transitional as a separate package.
> References: <a7f1e371d326618f1b48...@easthope.ca>
> <530A9882...@gmail.com>
>
> From: Scott Ferguson <scott.ferguso...@gmail.com>
> Date: Mon, 24 Feb 2014 11:55:30 +1100
>> NOTE: there four different "netcats" available in Wheezy.
>
> I found three.
> netcat-openbsd, netcat-traditional, netcat6.
>
> netcat-openbsd pleads ignorance.
> peter@dalton:~$ nc -l 25 -e ssmtp
> nc: invalid option -- 'e'
> ...
>
> netcat-traditional listens on the port; or appears to and does nothing.
> peter@dalton:~$ nc -l 25 -e ssmtp
> [gears humming]
>
> netcat6 refuses.
> peter@dalton:~$ nc -l -p 25 -e ssmtp
> nc: bind to source :: 25 failed: Permission denied
> nc: bind to source 0.0.0.0 25 failed: Permission denied
> nc: failed to bind to any local addr/port
listening on [any] 1025 ...
no connection : Connection timed out
Can't grab 0.0.0.0:25 with bind : Permission denied
(netcat-traditional 1.10-40)
Kind regards
<snipped>
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Zenaan Harkness
Feb 24, 2014, 4:10:02 AM2/24/14
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I'd include socat in the list, but perhaps it's command line options
are different? socat is my preferred network swiss army knife.
A little different, but there are also netsed, netrw etc.
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are different? socat is my preferred network swiss army knife.
A little different, but there are also netsed, netrw etc.
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Scott Ferguson
Feb 24, 2014, 4:20:01 AM2/24/14
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On 24/02/14 20:07, Zenaan Harkness wrote:
> I'd include socat in the list, but perhaps it's command line options
> are different? socat is my preferred network swiss army knife.
>
> A little different, but there are also netsed, netrw etc.
>
>
And the excellent crypcat - but I just counted the ones with netcat in
> I'd include socat in the list, but perhaps it's command line options
> are different? socat is my preferred network swiss army knife.
>
> A little different, but there are also netsed, netrw etc.
>
>
their name (in case the OP was, um, fussy about it), not necessarily
their functionality. I don't know what the actual criteria for being
"netcat" is, for me if it does the job and is in /etc/alternatives I'm
happy.
Kind regards
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Brian
Feb 24, 2014, 5:30:02 AM2/24/14
to
On Mon 24 Feb 2014 at 20:18:16 +1100, Scott Ferguson wrote:
> On 24/02/14 20:07, Zenaan Harkness wrote:
> > I'd include socat in the list, but perhaps it's command line options
> > are different? socat is my preferred network swiss army knife.
> >
> > A little different, but there are also netsed, netrw etc.
>
> And the excellent crypcat - but I just counted the ones with netcat in
> their name (in case the OP was, um, fussy about it), not necessarily
> their functionality. I don't know what the actual criteria for being
> "netcat" is, for me if it does the job and is in /etc/alternatives I'm
> happy.
There is also ncat, which comes in the nmap package and is described as
> On 24/02/14 20:07, Zenaan Harkness wrote:
> > I'd include socat in the list, but perhaps it's command line options
> > are different? socat is my preferred network swiss army knife.
> >
> > A little different, but there are also netsed, netrw etc.
>
> And the excellent crypcat - but I just counted the ones with netcat in
> their name (in case the OP was, um, fussy about it), not necessarily
> their functionality. I don't know what the actual criteria for being
> "netcat" is, for me if it does the job and is in /etc/alternatives I'm
> happy.
"a much-improved reimplementation of the venerable Netcat". This is what
the OP is apparently using. He might also have nc aliased to ncat.
I'd not previously come across the CAP_NET_BIND_SERVICE capability Pascal
Hambourg mentions; the OP could consider doing (as root)
setcap cap_net_bind_service=+ep /usr/bin/ncat
as a solution to his problem.
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Jonathan Dowland
Feb 24, 2014, 12:30:02 PM2/24/14
to
On 24/02/2014 10:21, Brian wrote:
> the OP could consider doing (as root)
>
> setcap cap_net_bind_service=+ep /usr/bin/ncat
>
> as a solution to his problem.
If they do, they should be aware that would essentially permit any user
> the OP could consider doing (as root)
>
> setcap cap_net_bind_service=+ep /usr/bin/ncat
>
> as a solution to his problem.
on the machine to bind to any port; since nc is a redirection system it
can be paired with any daemon or program.
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