Netcat is a simple but powerful utility program that reads and writes data across network connections, using TCP or UDP protocol, IPv4 or IPv6, with a variety of functions.
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39 views
netcat output into separate files using string delimters
I want netcat to pipe the output of a tcp/ip connection to commands that examine the output and split it into distinct files separated by the strings "msg" and "/msg" from the output, something like
...
-2
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0answers
58 views
Netcat as persistent reverse backdoor in Windows 7
I'm trying to establish a persistent netcat reverse backdoor connection between my laptop and the VMware machine that runs on my laptop.
Laptop OS is Windows 7 64bit. VMware machine OS is Windows 7 ...
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0answers
11 views
Forwarding traffic using nc on a linux box
On my system, I am sharing my internet which is on eth0 (ethernet) through wlan0 (wifi card).
I am then using mitmproxy to monitor the traffic and look into the ssl packets.
However, mitmproxy only ...
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1answer
1k views
Unix : `nc` on Ubuntu vs Redhat (netcat)
nc -q -1 local host ${PORT} ${CMD}
In Ubuntu, nc may be used as above, with the -q option. See manpage.
-q
after EOF on stdin, wait the
specified number of seconds and then
quit. If ...
2
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2answers
35 views
Use xargs to send requests to the same server in parallel with netcat
I am trying to devise a one-liner to send text to a simple echo server - but multiple connections in parallel. This is what I'm trying:
echo -e A,B,C,D | xargs -d, -i -P 4 echo {} | nc localhost ...
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0answers
42 views
How to use netcat with a password? [closed]
I need to login to another SSH server that can only be acsessed via the main server. Its a backup server. I was suggested netcat but when i log in i get this
This is a private system - No anonymous ...
2
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1answer
49 views
ncat only works in certain scenarios
I tried using ncat (a “much-improved reimplementation of netcat”) to chat with a friend (and ultimately want to send a large file, but I know I can get that working once I get chat to work).
We both ...
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1answer
38 views
Netcat stops when in a detached session
I want to use netcat to dump a number of blocks of strings to a file. I've been running this in my linux terminal and everything works very well until I try to detach my command line. If I run my ...
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2answers
69 views
Is it possible to push video out and usb over TCP/IP
I have a security camera system that is running Linux and is placed near the cameras (not in an office). It has a VGA out and uses a USB mouse. I'd love to redirect the VGA and USB to another ...
0
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2answers
109 views
List incoming connections on nc (netcat)
I set up nc on some computers in my office. They're connecting to our server like so:
nc 192.168.1.2 3291 -e cmd
Does anyone know how to list incoming connection attempts rather than accept one? ...
0
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0answers
174 views
Server: Microsoft-HTTPAPI/2.0 running on port 10234 on my Windows 7 pc?
I've recently set up a home server and spent some time working on the security. One of the tools I've been using nmap which I pointed at my Windows 7 desktop. It showed an unknown service on port ...
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2answers
197 views
ssh -R then expose the local port over HTTP?
Here's my scenario, I have two machines, A and B. A is behind a VPN, so B can't get to A. I have a web server:
machine_a$ curl localhost:8088
"hello from machine_a"
I have executed a remote SSH ...
1
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1answer
275 views
Can I stop a netcat tar pipe and continue later without overriding existing files?
I'm trying to copy a lot of files from my NAS to my server, about 2TB.
I found that using a netcat tar pipe to copy the directories goes pretty fast, about 40mb/s. It seems to work faster than rsync ...
0
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0answers
323 views
how to bypass this error : “port range not valid”?
I have a port number that I want to connect to it via net-cat.
previously I was working with windows and it was working perfect;
but now in Ubuntu when I want to run the Net-Cat it's show me this ...
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3answers
190 views
How to make netcat support ssl by combining openssl?
Original netcat doesn't support ssl. ncat from nmap project does.
In linux, we can connect multiple commands with pipeline.
Is it possible to combine netcat and openssl to create a ncat?
2
votes
1answer
463 views
Sending text file contents to server using netcat?
There is a daemon process listening on port 5144, which I cannot to modify.
I want to use netcat to send the contents of a text file to the server, but this causes netcat to hang the terminal until I ...
1
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2answers
142 views
How to download a URL from internet by netcat?
I can use netcat to transfer files between two computers.
# Server
nc -l -p 8080 < file
# client
nc 192.168.1.101 8080 > file
Can I use netcat to download a URL from Internet like wget?
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1answer
43 views
Two hop SSH with multiple user names
I am trying to set up an ssh proxycommand, where the user name at the final host is different from the user name at the original host. I am logged in on firstHost as username and want to effectively ...
1
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1answer
175 views
Cygwin netcat nc doesn't resolve hosts through /etc/hosts
I'm trying to use ssh to log into remote servers, and I have a ProxyCommand setup in ~/.ssh/config to use a proxy (setup through PuTTY to connect to a VPN). The ProxyCommand uses nc to connect ...
0
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0answers
109 views
Mac-OS is blocking connections to an IP
Mac-OS 10.8.2 is blocking all outgoing connections to a specific IP (a mail server which is not on local network). I tried to disable the firewall but no change. The DNS resolver seems to work well, I ...
1
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1answer
596 views
Bash RTSP client with netcat - keep connection open while parsing sent data with sed?
I am trying to make a RTSP client in bash. Problem is that I must make only one connection to the server through which it will send video frames. I can keep it on one connection up to the point at ...
0
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1answer
67 views
Knock on a port to get service and version
I'm having difficulty remmebering a certain command I would use in bash that would give information about a port it would 'knock' on.
I've used ssh backdoors before so that I can access my home ...
1
vote
2answers
141 views
Nested Redirection in BASH
I have a scenario where I want to filter log files. To do this I am wanting to follow the last 10 lines or so of a log file and as new lines are read in, pipe them through an awk program and then ...
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2answers
233 views
Meaning of “netcat can be used as a backdoor” [closed]
I recently read about netcat and it is often mentioned that it could be used as a "backdoor". What exactly is meant by backdoor? Could some one give an example of such usage of netcat.
2
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1answer
222 views
How to pipe the output of a linux command back into the predecesssing command
The linux command
nc -l 8090 | (read METHOD URI PROTOCOL ; echo "method: $METHOD" ; echo "path: $URI" ; echo "prot: $PROTOCOL")
listens to port 8090 and when I type something like ...
2
votes
2answers
343 views
Use netcat as a proxy to log traffic
I want to use netcat as a proxy to log http requests and responses to files, then tail these to inspect traffic. Think wireshark.
Tried the following where 'fifo' is a named pipe, 'in' and 'out' are ...
2
votes
1answer
357 views
Unix bidirectional pipe on commandline
I've been able to use this linux command to connect Netcat to a serial port:
nc -l 80 <> /dev/ttyS0
I would like to be able to log this transaction. My backup plan is to use Wireshark to ...
0
votes
3answers
687 views
Using nc (netcat) to emulate NTP server response
I want to test some security on an NTP client developed in-house and would like to use netcat to do it. I have packets captured with Wireshark from previous NTP exchanges that I tried to feed to the ...
0
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3answers
302 views
How do I make netcat receive UDP packets from any host?
Is there a way to make netcat receive UDP packets from any ip:port? I don't want it to bind to a specific host as the first packet comes.
I can consider alternatives, but they have to be bash ...
0
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1answer
223 views
TCP connection to my host's public IP address using Linux netcat
I need to make a TCP connection to my machine through an application that needs only the public IP address and port to connect.
I have been able to do it in Windows, but I need to do it in Linux ...
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1answer
611 views
Why is “nc -l xxxx” not opening a port?
I'm trying to get netcat to listen on port 4444, but it doesn't seem to be working. I am checking to see if the port is open using nmap, but it doesn't pick it up and I can't figure out why. I have ...
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2answers
179 views
How do I send and receive simultaneously with netcat?
I need to test a TCP server by connecting with netcat as a client sending a stream from /dev/random and at the same time pipe the output to /dev/null.
Receiving:
nc 127.0.0.1 3000 > /dev/null
...
4
votes
1answer
2k views
Can the Telnet/Netcat client communicate over SSL?
I would like to test client connections with IMAP over SSL, HTTPS, and other secure text-based Internet protocols over SSL/TLS, the same way I would using Telnet or Netcat if they were not tunneled ...
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1answer
511 views
netcat and tee redirection via a bash script
Quick question that has been haunting me all day..
I have a bash script that includes this line:
nc -l 8044 | tee nc-output &
The output from netcat is never being written to nc-output.
If I ...
2
votes
3answers
2k views
netcat as a multithread server
I use netcat to run a simple server like this:
while true; do nc -l -p 2468 -e ./my_exe; done
This way, anyone is able to connect to my host on port 2468 and talk with "my_exe".
Unfortunately, if ...
3
votes
1answer
471 views
How can I force netcat to send my input immediately, not just on newlines?
How can I force netcat to send my input immediately, not just on newlines? I want to test an HTTP parser manually and check how it behaves when header lines are spread across multiple packets.
2
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1answer
1k views
How to get the WAN IP from a router using UPnP/SSDP
I'm trying to find a way to get my router to report back my WAN IP using UPnP/SSDP, but so far I have been unable to even get a list of UPnP supporting internet access devices on my network. Here's ...
4
votes
3answers
6k views
How can I pipe commands to a netcat that will stay alive?
echo command | netcat host port
This results in the command being sent to the remote host and some data being read back. But after a few seconds, the connection closes. The -w parameter did not ...
0
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0answers
959 views
Port forwarding on D-link DIR-615 router
I'm attempting to configure my router to forward a port to my Linux machine. The Linux computer has a static IP (192.168.0.185) Right now I'm just experimenting to make sure I can forward a port, so ...
0
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1answer
458 views
Can I use nc and/or stunnel to make a transparent SSL proxy such that I can specify the outgoing source port?
I've been playing around a bit with different variations and can't seem to find something that quite works.
I want to be able to 'bridge' an SSL connection across a particular gateway node in the ...
1
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2answers
219 views
How to set up a secure chat using netcat
I use netcat to chat in LAN.
PC1 listen port 8080
$ nc -l -p 8080
PC2 connect to PC1:8080
$ nc 192.168.10.1 8080
Unfortunately, this is not secure. Anyone sniffing packets can intercept my ...
1
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1answer
809 views
bidirectional socat functionality with nc
This is question is somehow related to
How is it called when listening(connecting) two sockets and exchanging data between them?
In the test setup I have three terminal windows open
I run in
Term1: ...
5
votes
1answer
731 views
versions of netcat
I've tried the two main versions of netcat : GNU and BSD. (mine is BSD Version).
On GNU version, the command $ nc -l -p 12345 works fine
but with BSD, option -l (listen) can't be used in conjonction ...
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1answer
151 views
Can I use dd to clone two drives from two machines simultaneously?
To clarify, I have two machines: Machine1 and Machine2. Each machine has 2 disks (Machine1 has Disk1-1 and Disk1-2; simiarly, Machine2 has Disk2-1 and Disk2-2). Can I use 'dd' to clone Disk1-1 to ...
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2answers
3k views
Netcat/socat behavior with piping and UDP?
I guess this is close to linux - Netcat stops listening for UDP traffic - Super User, but I thought I'd better ask anyways
As far as versions of netcat I'm using Ubuntu 11.04 and the default netcat ...
0
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1answer
208 views
cat file that contains escaped characters to netcat
I'm trying to test a webserver with some HTTP request written in a file.
GET / HTTP/1.1\r\n\r\n
Right now I'm feeding that file to netcat like this:
cat files | nc localhost 80
However, the \r\n ...
2
votes
1answer
131 views
Monitoring incoming requests on a web hosting server
I have a web hosting account with GoDaddy (its a Linux based hosting). Can I install applications like netcat to monitor all incoming requests to my website on a certain port? If not, is there any ...
1
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1answer
2k views
Linux built-in or open source program to join multicast group?
I'm using tcpdump to capture multicast packets and had to code up a custom program to join multicast feeds so tcpdump will "see" the packets. Just wondering if netcat or any other applications can ...
0
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2answers
1k views
nc or socat: How to read data from remote:/dev/ttyACM0?
I have a device running at a remote computer on /dev/ttyACM0
Now I want to read that data on my computer.
I can connect to it over ssh.
Unfortunately I am a nc/socat rookie and no howto covered this.
...
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0answers
107 views
How to upload a file to windows through a netcat session
I have a netcat session and I want to upload a binary to the target windows machine. How can I do so? Is there a native "wget" in windows?
