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Date:      Mon, 23 Jul 2012 23:29:38 +0800
From:      lei yang <yanglei.fage@gmail.com>
To:        Polytropon <freebsd@edvax.de>
Cc:        freebsd-questions@freebsd.org
Subject:   Re: help about free bsp version netcat to work it on ubuntu
Message-ID:  <CAHsH0E9e28xwSpYnp7GmW=S=tvkWoMorHhqfepd6M9EyiahyUA@mail.gmail.com>
In-Reply-To: <20120723163604.6e795aa4.freebsd@edvax.de>
References:  <CAHsH0E_mj-g3YZcuMe0+DYLy_6=gzJNrhFE=CAy2SmiufUCAYA@mail.gmail.com> <20120722182545.39d6b96c.freebsd@edvax.de> <CAHsH0E9NkghmTPB=81bdquxq58kNFWuzyQAnzgZrhM54S7n9vA@mail.gmail.com> <20120723163604.6e795aa4.freebsd@edvax.de>

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On Mon, Jul 23, 2012 at 10:36 PM, Polytropon <freebsd@edvax.de> wrote:
> On Mon, 23 Jul 2012 12:59:55 +0800, lei yang wrote:
>> On Mon, Jul 23, 2012 at 12:25 AM, Polytropon <freebsd@edvax.de> wrote:
>> > On Sun, 22 Jul 2012 22:41:57 +0800, lei yang wrote:
>> >> Hi,
>> >>
>> >> I want to build a "netcat" on my local pc (ubuntu) with gcc, is it
>> >> possible? I'm new to free bsd
>> >
>> > I hope I don't misunderstand your intention: You are trying to
>> > build a Linux executable of netcat from FreeBSD's sources?
>> >
>> > You _do_ know that FreeBSD and Linux (here: Ubuntu) are two
>> > totally different operating systems. I'm not sure code is
>> > compatible at this level (but it maybe _could_ be, you'd
>> > have to try it).
>> >
>> > The netcat program (nc) is part of the FreeBSD operating
>> > system for some time now. There's also a port of netcat
>> > in /usr/ports/net/netcat (which can also be used). That
>> > port's Makefile lists some sources:
>> >
>> > ftp://coast.cs.purdue.edu/pub/tools/unix/netutils/netcat/
>> >
>> > ftp://ftp.cuhk.edu.hk/pub/packages/security/purdue/netutils/netcat/
>> >
>> > http://www.planetmirror.com/pub/lprng/TOOLS/
>> >
>> > You could try to use that source distribution as well.
>> >
>> >
>>
>>
>> Thanks for the great help, I have built it successfully on my ubuntu.
>> I find it's not the version I want
>> I want use the version on Rehat,which has a "-U" flag( yes, I want to
>> use this flag) but the above version has no this flag
>>
>> on redhat:
>>
>> usage: nc [-46DdhklnrStUuvzC] [-i interval] [-p source_port]
>>         [-s source_ip_address] [-T ToS] [-w timeout] [-X proxy_version]
>>         [-x proxy_address[:port]] [hostname] [port[s]]
>>       Command Summary:
>>               -4              Use IPv4
>>               -6              Use IPv6
>>               -D              Enable the debug socket option
>>               -d              Detach from stdin
>>               -h              This help text
>>               -i secs         Delay interval for lines sent, ports scanned
>>               -k              Keep inbound sockets open for multiple connects
>>               -l              Listen mode, for inbound connects
>>               -n              Suppress name/port resolutions
>>               -p port         Specify local port for remote connects
>>               -r              Randomize remote ports
>>               -s addr         Local source address
>>               -T ToS          Set IP Type of Service
>>               -C              Send CRLF as line-ending
>>               -t              Answer TELNET negotiation
>>               -U              Use UNIX domain socket
>>               -u              UDP mode
>>               -v              Verbose
>>               -w secs         Timeout for connects and final net reads
>>               -X proto        Proxy protocol: "4", "5" (SOCKS) or "connect"
>>               -x addr[:port]  Specify proxy address and port
>>               -z              Zero-I/O mode [used for scanning]
>>       Port numbers can be individual or ranges: lo-hi [inclusive]
>>
>> ------------------------------------------------------------------------------------------------------------------
>> with the above you list:
>>
>> lyang0@lyang0-OptiPlex-755:~/tmp/nc110$ ./nc -help
>> [v1.10]
>> connect to somewhere: nc [-options] hostname port[s] [ports] ...
>> listen for inbound:   nc -l -p port [-options] [hostname] [port]
>> options:
>>       -g gateway              source-routing hop point[s], up to 8
>>       -G num                  source-routing pointer: 4, 8, 12, ...
>>       -h                      this cruft
>>       -i secs                 delay interval for lines sent, ports scanned
>>       -l                      listen mode, for inbound connects
>>       -n                      numeric-only IP addresses, no DNS
>>       -o file                 hex dump of traffic
>>       -p port                 local port number
>>       -r                      randomize local and remote ports
>>       -s addr                 local source address
>>       -u                      UDP mode
>>       -v                      verbose [use twice to be more verbose]
>>       -w secs                 timeout for connects and final net reads
>>       -z                      zero-I/O mode [used for scanning]
>> port numbers can be individual or ranges: lo-hi [inclusive]
>>
>>
>> it has no "-U" flag, can you point me where I get this version
>
> This indicates you did use the netcat version that also is
> in the FreeBSD Ports Collection. The netcat version that
> belongs to the FreeBSD system (the operating system itself)
> does seem to have the switch you need.
>
> From my home FreeBSD box (8.2-STABLE of August 2011, i386),
> THIS is the netcat help message:
>
> % nc -help
> usage: nc [-46DdEhklnrStUuvz] [-e policy] [-I length] [-i interval] [-O length]
>           [-P proxy_username] [-p source_port] [-s source] [-T ToS]
>           [-V rtable] [-w timeout] [-X proxy_protocol]
>           [-x proxy_address[:port]] [destination] [port]
>         Command Summary:
>                 -4              Use IPv4
>                 -6              Use IPv6
>                 -D              Enable the debug socket option
>                 -d              Detach from stdin
>                 -E              Use IPsec ESP
>                 -e policy       Use specified IPsec policy
>                 -h              This help text
>                 -I length       TCP receive buffer length
>                 -i secs         Delay interval for lines sent, ports scanned
>                 -k              Keep inbound sockets open for multiple connects
>                 -l              Listen mode, for inbound connects
>                 -n              Suppress name/port resolutions
>                 --no-tcpopt     Disable TCP options
>                 -O length       TCP send buffer length
>                 -P proxyuser    Username for proxy authentication
>                 -p port         Specify local port for remote connects
>                 -r              Randomize remote ports
>                 -S              Enable the TCP MD5 signature option
>                 -s addr         Local source address
>                 -T ToS          Set IP Type of Service
>                 -t              Answer TELNET negotiation
>                 -U              Use UNIX domain socket
>                 -u              UDP mode
>                 -V rtable       Specify alternate routing table
>                 -v              Verbose
>                 -w secs         Timeout for connects and final net reads
>                 -X proto        Proxy protocol: "4", "5" (SOCKS) or "connect"
>                 -x addr[:port]  Specify proxy address and port
>                 -z              Zero-I/O mode [used for scanning]
>         Port numbers can be individual or ranges: lo-hi [inclusive]
> See ipsec_set_policy(3) for -e argument format
>
>
>
> It seems you sould then try to use the FreeBSD's netcat sources.
> In my previous message, I pointed out where to find it (i. e. in
> the system's sources).
>

Yes, the second version I post is using the source from you supplied,
then I compiled it, but it has no
"-U" flag like what I post, it seems a version different casued this.


> By the way, wouldn't it be easier to use Red Hat's netcat source
> to compile on Ubuntu, because both are Linusi (and therefore should
> be "more equal" to each other than Ubuntu to FreeBSD)?
>
>

I don't know where to find the source code in Red Hat.


>
> --
> Polytropon
> Magdeburg, Germany
> Happy FreeBSD user since 4.0
> Andra moi ennepe, Mousa, ...



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