help about free bsp version netcat to work it on ubuntu
lei yang
yanglei.fage at gmail.com
Mon Jul 23 15:29:39 UTC 2012
On Mon, Jul 23, 2012 at 10:36 PM, Polytropon <freebsd at 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 at 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 at 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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