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Netcat is a computer networking service for reading from and writing network connections using TCP or UDP

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I want to send a file to a TCP server, keep the TCP connection open, wait (couple of seconds) for the response, and send the response to stdout. I don't want the connection to be (half) closed ...
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I have tried the following to no avail, the script just stops after the first input. filename="..." while IFS="" read -r line; do echo "$line" | nc <target> <...
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I'm trying to learn how to interact with message buses under Linux, and doing so with shell commands that doesn't involve utilities packaged under dbus-*. For this instance, I want to understand how ...
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We routinely use netcat (nc) to read data from UDP ports. For example: user@host ~$ nc -luv 57303 Listening on [0.0.0.0] (family 0, port 57303) NAV 2024/12/05 12:09:56.326365 DPS112 $GPZDA,121003.35,...
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I'm using a fresh minimal Ubuntu server 24.04.1 LTS install. I run these commands as root to set up networking and do some experiments: If you have seen this post, it's the same setup but with the ip ...
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I'm using a fresh minimal Ubuntu server 24.04.1 LTS install. I run these commands as root to set up networking and do some experiments: apt install netcat-traditional ip netns add ns1 ip netns add ...
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On a Ubuntu system I have the netcat(-openbsd) package installed, the one that, when run with no parameters, prints: This is nc from the netcat-openbsd package. An alternative nc is available in the ...
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I use an embedded computer to send data to a Linux serial port for transfer to a remote server. The terminal mode is "none". After my embedded system logs in, it sends data for example, ...
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How to check if a port is blocked with socat? How to check with IPv6? I heard a saying that machines behind NAT can still be directly connected via IPv6, is that true? Anyway, say I have a machine ...
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I want to pipe and live play the sound recorded on my raspberry to my MacBook. I've tried the following: On My raspberry: I tried to establish a data stream on a port 3333 arecord -D plughw:3,0 -f ...
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I have this nginx custom configuration: server { listen 8080; server_name subdomain.domain.my.id; location /vless-ws { # Consistent with the path of V2Ray configuration if ($...
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In a docker image I want to avoid installing netcat in order to ping for db connectivity at my entrypoint script: /bin/sh MOODLE_DB_HOST="xxxx" MOODLE_DB_PORT=80 function pingdb { OK=0 ...
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I'm using netcat and stty to get terminal (tty) access, but I'm not able to do so as the CTRL+Z action on the netcat session is giving me suspended session instead of stopped and then I'm not able to ...
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I have this exact code: #!/bin/bash gtimeout(){ if type -f gtimeout &> /dev/null; then command gtimeout "$@" else timeout "$@" fi } export -f gtimeout; ...
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BusyBox v1.36.1 (2023-07-17 18:29:09 UTC) multi-call binary. I run minimal nc server like: nc -lkp 12345 I can connect to it once nc localhost 12345. After ctr-C, the next attempt will fail. however ...
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Both client and server are Debian 11 On Server as root: nc -ulp 1194 On Client as root: nc -u serverip 1194 When I type something on client, in theory it should appear on the server right if no ...
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I am using netcat to get a series of points which I would like to plot with gnuplot. However, I am having trouble passing the data to gnuplot without writing it to a file first. In the simplest case, ...
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I am working on a script to parse a file containing a list of IP addresses and ports then do a bunch of test on the ports with netcat. The port argument can be a single port, a list of ports, or a ...
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I used dd to create a sample empty file with 1MB, edited the sample file, created a MD5 hash of the file, started a listener on the examiner machine, piped the output off to nc and compared the hashes....
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I have a PHP-based website, and I'm trying to integrate it with another system. This system sends XML data to a specific port (let's say port 9999). I am able to capture the incoming data and save it ...
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This to my understanding records mono in wav format for 300 seconds to a named pipe called "mic_rec" rec arecord -D hw:4,0 -d 300 -f cd -t wav -c 1 mic_rec And this sends whatever it finds ...
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In debian:bullseye oot@4770c7ba00ac:/# apt install -y netcat Reading package lists... Done Building dependency tree... Done Reading state information... Done The following additional packages will be ...
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I'm working through an introductory cybersec challenge that requires me to upload a word and brute force a 4 digit code to a port. I put the combinations in a file, and tried to use netcat to upload ...
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How can I run a program that expects to be executing in a terminal in such a way that it's STDIO can be arbitrarily connected-to remotely? Specifically, I want to be able to launch gdb on one host and ...
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Context : I want to test UDP port with nc command What happens : nc command return nothing on output and 0 when i put echo $? Which command : nc -vzu <ip> <port> echo $? What is the ...
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So far I use multicast with ipv4 and it works; all involved computers run linux. I listen on two machines and send on one of those two (in a separate terminal). In the below example 'Hello 1' is ...
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I want to use netcat as a TCP-server that reads data from a named pipe. For that I did the following: Step 1. Created a pipe and the server that uses it as a source mkfifo /tmp/all.pipe nc -k -l 8080 &...
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I am listening on a port for logs coming from a device, then I used netcat to redirect those logs to a text file whenever a log is available on the device and all this to happen in the background ...
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nc -l -u 6666 on the receiving machine gets no messages from netconsole. tested by doing "echo test > /dev/kmsg" i am able to connect with netcat by doing "nc -u 10.0.0.192 6666"...
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For an assignment I'm trying to properly send a buffer overflow exploit with ncat in order gain root access on a vulnerable machine set up by the professor. I feel I created my egg right but I keep ...
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Currently, I am working on a project where I use telnet to netcat to send an email message within my university. I am trying to make the process automated but my script can't seem to enter in any ...
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How do I specify source port in socat? In netcat I can simply: nc -u -s 192.168.0.1 -p 8888 192.168.0.2 9999 I tried socat udp4:192.168.0.2:9999 STDIN:192.168.0.1:8888 It's failed STDIN: wrong ...
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I am using netcat to run a file over a network like so nc -lvnp 1111 -e file on the client machine, the connection is empty and I only get an output after I enter an input. How to show the output of ...
sam's user avatar
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I am working on a process to send data via a pipe from one server to another for processing. Although this is not the exact command, it might look something like this: tail -f logfile | grep "abc&...
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I have 2 Ubuntu boxes one of them acting as an Attack platform (we will call it AP), the other as an already compromised server (we will call it S1). I have this rule sudo iptables -t nat -I ...
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If you had two computers, wanting to control one from another using only ncat, without using telnet, ssh or other networking tools and only two shells, how could i go about that? I have successfully ...
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I'm trying to send a binary packet to a local process, via netcat (nc), like this: nc -w 1 -u localhost 10000 < my_binary_packet.bin The output is: read(net): Connection refused Anyone know what'...
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Any idea why nc command is not working and telnet is working. Ideally nc will also work. I am trying to use nc in script but getting error however telnet is working. Ideally nc command is working for ...
rizwan's user avatar
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I have this script on a Linux machine that loops through a .txt file to see if connection is successful or not. When I give the IP directly is works. However, when I pass the variable it says: nc: ...
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I have a Python script accessible with netcat: nc 'serverIP' port. The Python script awaits an input from the user. If the input is expected, the script keeps running. If the input is unexpect (e.g. ...
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I am trying to use netcat to echo some data to a custom board I have. The board is connected using a 10G Ethernet connection. I can see that the link is up but when I try using netcat I am not getting ...
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Sorry if the question's title isn't clear about the objective of this question. I was able to make a respond-only webserver using Bash only; when it gets a curl post request, it returns results no ...
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I am using netcat to connect to a server over TCP and continuously pipe the data received to file. nc 10.0.2.2 3456 > file.data When running this from terminal or a script it stays connected I want ...
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I am currently working on Machine's on HackTheBox. I've used nc -lvnp (port) quite a bit and i've never ran into this issue: $nc -lvnp 4444 listening on [any] 4444 .... connect to [my IP] from (...
Adam Carson's user avatar
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I have a situation where we are trying to get data from one network to another - specifically access to a private maven repo on a different network. Network 1 contains a maven repo. And network is ...
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I'm having a bit of trouble utilising netcat on Arch, specifically, the GNU version of it. My situation: I basically made a simple server in Python that can accept multiple clients and send responses. ...
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I have access to just *nix systems. Either NetBSD and/or bare Linux-based OS. So my question comes from the fact that ADB is not widely available on all platforms, if so is very hard to install or ...
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Ι am nc-listening on localhost:2500 ▶ nc -l 2500 _ On another terminal I am trying to connect to this listening end ▶ nc -zv localhost 2500 nc: connectx to localhost port 2500 (tcp) failed: ...
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I'm using macOS with gnu netcat. I want to understand how can I broadcast message using netcat. I have a netcat listening on 4555 netcat -l -p 4555 192.168.0.101 but as I attempt to send a broadcast ...
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I'm trying to do a simple exercise, where I need to set up a "server" hosting a bind shell, using netcat. On my localhost. I'm running ubuntu 20.04 I'm following this tutorial, that has this ...
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