problem about netcat-Collection of common programming errors
user2307181
android tcp raspberry-pi iptables netcat
Hello im new in linux and android programming , my idea is send packet data from Raspberry Pi to Android Phone via TCP socket. .When connection started, the data stream well , after few data sent the streaming sometimes “jammed”. My android phone IP 192.168.43.1 My static Raspberry IP 192.168.43.5I try to change the port number but the connection still jammed, I try to reduce the size of the packet data but also still jammed .I assume the raspberry firewall (if it exist) is the problem Or maybe
baptx
sockets unix debian netcat
This question is following this one: Sockets working in openSUSE do not work in Debian?When working with sockets on my Debian system, I have to use nc -l -p port_number to simulate the server I want to talk with. If I’m using nc -l port_number, it will fail when using the socket connect function and strerror(errno) will say “Connection refused”.Netcat without -p option is working great on other Linux distributions, what should I change on my configuration?
FighterWks
shell syntax syntax-error sh netcat
Hello i have a problem in this script This feature is apparently bad but how to fix it?nc -z -v ip adress port if connect to ip adress port 13000 (tcp) failed: Connection refused then cd /usr/home/game/ ./game else exit fierror :5: Syntax error: “(” unexpected (expecting “then”)
Luis Daniel Rubiera
linux scripting netcat busybox
Im new in netcat, but im trying to use the same line in the busybox, as i do in my pc, i want to know how can i change de redirection operator.nc -w 30 IP 3031 -e <<<“info”this is the error-sh: syntax error: redirection unexpectedi think it doesnt like <<<, but should i switch it for what :/ ?many thanks!btw this script trows the information it get to the screen, by sending “info”
heavyd
linux udp netcat
I am using netcat on some Linux machines (see this other question), but seeing some unexpected behavior.Unlike the guide in the accepted answer, I am not using UDP tunneling to do DNS queries. I have a remote server that I can log into, but not install software on, and I’m trying to tunnel UDP traffic from my computer to the server, and then setup a separate tunnel to send UDP responses back from the server to my machine.The tunnel going from my machine to the server is working perfectly, howev
Zek
linux centos relay netcat
I have a legacy database application that can be accessed via ODBC on port 3000. I have set up a simple netcat relay on a bastion host so that this ODBC access can be done via the bastion host:while true ; do nc -n 192.168.1.2 -l 3000 0<backpipe | nc -n 192.168.1.3 3000 1>backpipe ; done 192.168.1.2: bastion host (CentOS 6.x [64]) 192.168.1.3: legacy server with ODBC service on port 3000 (Redhat EL 3.x)It works (kinda), but it is not reliable. What happens is that I often get errors and
smagch
node.js sockets tcp netcat
I want to compile some markdown posts thorough netcat. Here is Makefile.# Makefileall: $(POSTS)$(POST_DEST_DIR)/%.html: $(POST_SRC_DIR)/%.md | $(POST_DEST_DIR)@nc localhost 3000 < $< > $@@echo ‘compiled $@’.DELETE_ON_ERROR: $(POSTS)When TCP server exit with error, nc exit without error while Node.js nc wrapper exit with error. Here is a Node.js wrapper script.// nc.jsvar client = require(‘net’).connect(3000); process.stdin.pipe(client); client.pipe(process.stdout); client.on(‘error’, fu
A.Rashad
c makefile aix netcat
I have been trying to compile netcat.c on AIX for some time (using the command make aix), but the compiler gives me some weird feedback such as :”netcat.c”, line 117.12: 1506-275 (S) Unexpected text ‘int’ encountered.when checked the file netcat.c at line 117, I would find the line (second line in code below):#ifdef HAVE_BIND extern int h_errno; /* stolen almost wholesale from bsd herror.c */even if I changed the int into char for the same of testing, save the file and re-run the command I get t
Striketh
centos kernel netcat kernel-panic
I’ve gotten netconsole setup on a server that’s been having a variety of kernel panics lately and I’m trying to log kernel messages to another server. I’ve tested netconsole after setting it up on the host server by start a netcat session and typing in some random bits of data. These arrive on the capturing server without any issue and I’m able to view the text in the log file I have setup.However, nothing that is being logged in dmesg (i.e. kernel messages) is being forwarded to the capturing s
scttnlsn
sockets node.js tcp telnet netcat
I am issuing newline-separated text commands to a custom protocol TCP server. In the example below I issue 2 commands and receive a response written back. It works as expected in telnet and netcat:$ nc localhost 1234 command1 command2 theresponseThe same workflow is not working when connecting with Node.js:var net = require(‘net’); var client = net.connect(1234, ‘localhost’);client.on(‘data’, function(data) {console.log(‘data:’, data.toString()); });client.on(‘error’, function(err) {console.lo
Grezzo
linux port nmap netcat
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 tried various ports with no joy.Here is a copy of my terminal so you can see what I am doing and what I have tried:#iptables -LChain INPUT (policy ACCEPT) target prot opt source destinationChain FORWARD (policy ACCEPT) target prot opt source destinationChain OUTPUT
Frank Science
vim lisp scheme netcat
My operating system is Debian Squeeze. Here’s the vim version:VIM – Vi IMproved 7.2 (2008 Aug 9, compiled Jul 12 2010 02:29:33)I read a tutorial on http://kovisoft.bitbucket.org/tutorial.html and tried to start REPL for MIT-Scheme. Unfortunately, I failed to start.When I pressed “,c”, it started a terminal window loading mit-scheme. Nothing showed in the REPL buffer of vim. Some errors showed in the terminal:Listening on port: 4005 ;netcat: “4005: inverse host lookup failed: Unknown host” ;To co
Michael Foukarakis
image bash http netcat
I’m trying to write a little HTTP server using netcat. For plain text files this works fine but when I try to send a picture, the browser displays only the icon for broken images. What I do is extracting the mime-type and size of a requested file and cat it to the client. The header of a request of my example picture looks like this:HTTP/1.0 200 OK Content-Length: 197677 Content-Type: image/jpegThis is my bash script which I launch with -e option of the netcat tool:#!/bin/bash# — OPTIONS index
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