netcat | 易学教程

Using netcat with -p option [closed]

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问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 6 years ago . I used netcat in the following way nc -l 3333 //for server nc 127.0.0.1 3333 // for client With this I am able to use it as a two way chatting system. My question is, then why is there another option -p ( -p source_port Specifies the source port nc should use, subject to privilege restrictions and availability.)

集群配置--安装netcat

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在Linux中有一个级强大的网络工具netcat，在默认情况下面都是没有安装的，现在介绍一下安装过程其实安装很简单一、下载安装切换到root用户： yum install - y nc 二、测试使用在一个终端上输入 nc -lk 9999 问题描述三、解决方案 # Removes the old package yum erase nc #Manually downloads the working package from the Official Repository wget http : / / vault . centos . org / 6.6 / os / x86_64 / Packages / nc - 1.84 - 22. el6 . x86_64 . rpm #Installs the package rpm - iUv nc - 1.84 - 22. el6 . x86_64 . rpm 四、使用 nc - lk 9999 输入数据。。。来源： CSDN 作者： studyhardatEnglish 链接： https://blog.csdn.net/qq_37554565/article/details/103457525

How to make Netcat display Payload of packet

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问题 I don't know if this is possible but I am wondering? I am doing some internal pentesting and using Scapy and Netcat, and I created a TCP packet with the payload "testing". I want to get the payload content piped into Netcat's listening port, using this example code: test = IP(src="192.168.4.134")/TCP(dport=1234)/"testing" send(test) but all that ever prints is: . Sent 1 packets Which is what Scapy spits out after its sent the packet. I've been trying to figure out what I need to use in my

How to delay pipe netcat to connect on first input

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问题 Running in bash under Ubuntu: I have a source that generates me some output, but not straight away. Let's assume it is a first netcat listening on a socket: netcat -l 12345 . And I would like to pipe it to an outgoing netcat (connecting over TCP), e.g. netcat -l 12345 | netcat localhost 54321 . But the tricky bit is, that I know there is nothing listening for that incoming connection on localhost 54321 when I run the command, but I know there will be one when the first actual character

Is a conditional response possible with netcat

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问题 I want to run netcat ( netcat-openbsd 1.105-7ubuntu1 ) and simulate a chat sequence. I want the netcat response automatically. Example of what I want. NETCAT: nc -l 8080 CLIENT: nc localhost 8080 CLIENT: hello NETCAT: (if statment) if hello do hello friend if bye do bye friend send a FIN tcp default date() I copied the code of this question (in the asnwer by @wooghie): run a command conditionally with netcat and grep ...but the message wasn't sent to the client. Netcat was on listen mode. #!

Running netcat through vb forms

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问题 i am trying to run netcat to programatically transfer a file using vb 2010 express. I am getting this error in console window : nc: forward host lookup failed:h_errno 11004: NO_DATA When i try to run the same code through batch file it works: nc -l -p 3334 < some.exe I have given a simple button and tried with the following codes: 'Dim p As New ProcessStartInfo 'p.FileName = "Cmd.exe" 'p.Arguments = "nc -l -p 3334 < RADTools.exe" 'Process.Start(p) Process.Start("nc.exe", "nc -l -p 3334 <

netcat working on localhost but not from remote host

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问题 I have two machines (Machine1 & Machine2) on the same subnet. Machine1 has a tool installed that returns some data. for example if I run the following command, it returns some data. printf "get:info\nend\n" | nc localhost 1234 However if do the same on Machine2, of course changing localhost to machine1, nothing happens. Any Idea what can be the problem? printf "get:info\nend\n" | nc machine1 1234 回答1: After investigating alot I finally managed to find the reason why I was not able to

Netcat drops incoming packets

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问题 I use bash commands on a Ubuntu machine for controlling a measurement instrument. Both machines are connected to the same LAN. The measurement instrument listens on TCP port 5025 for SCPI commands. The standard test - asking for the instrument's ID - works nicely: mjh@Ubuntu:~$ echo "*IDN?" | netcat 192.168.0.10 5025 Rohde&Schwarz,ZVL-3,12345 But when I query for data (I expect 1818 ASCII characters), netcat just returns immediately: mjh@Ubuntu:~$ echo "TRAC? TRACE1" | netcat 192.168.0.10

Netcat Triggers Connection Reset Error When Program Exits

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问题 I'm using netcat -e $prog , which is fine, but whenever $prog exits, netcat hangs up on the original connection. Any thoughts on how to make it disconnect with a clean FIN-ACK? Or why it's not in the first place? $ nc localhost 2000 *random data that should just cause it to exit cleanly* read(net): Connection reset by peer $ 来源： https://stackoverflow.com/questions/34687738/netcat-triggers-connection-reset-error-when-program-exits

Why doesnt this regex work?

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问题 Here is the code in question: import subprocess import re import os p = subprocess.Popen(["nc -zv 8.8.8.8 53"], stdout=subprocess.PIPE, shell = True) out, err = p.communicate() regex = re.search("succeeded", out) if not regex: print ("test") What i want it to do is to print out test if the regex does not match the netcat command. Right now im only matching on "succeeded" but that's all i need because the netcat command prints out : Connection to 8.8.8.8 53 port [tcp/domain] succeeded! The