netcat | 易学教程

How to connect to netcat running in docker container?

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问题 I'm looking small rest server for sent request and execute scenario. I've found it here: Create a minimum REST Web Server with netcat nc I'm trying to execute this small rest server. Below Dockerfile and bash script. Dockerfile FROM debian ADD ./rest.sh /rest.sh RUN apt-get update \ && DEBIAN_FRONTEND=noninteractive \ && apt-get install -y net-tools netcat curl \ && apt-get clean \ && rm -rf /var/lib/apt/lists/* \ && chmod +x /rest.sh EXPOSE 80 CMD /rest.sh rest.sh #!/bin/bash /bin/rm -f out

How do I download multiple files using one HTTP 1.1 request

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问题 Using nc, I was able to download one file with: GET /index.html HTTP/1.1 Host: {insert host name} But I can't figure out how to download multiple files in one request 来源： https://stackoverflow.com/questions/60562065/how-do-i-download-multiple-files-using-one-http-1-1-request

Send grepped tail output to netcat

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问题 I am trying to run the following command, and nothing is getting sent to netcat tail -F file.txt | grep test | nc host 9999 If I remove the grep, the tail successfully is followed and sent to netcat. If I just run the following, data comes back, so I know that data should be getting sent to the nc pipe: tail -F file.txt | grep test Any ideas? UPDATE I added the following to unbuffer the piped output and nothing goes through: tail -F file.txt | stdbuf -o0 grep test | nc host 9999 When I turn

Client doesn't close connection to server after receiving all responses

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问题 For a school project, I have to create a bash script which communicates with a distant netcat server and sends commands to this server, and gets back responses. In my client script, I have a sendMessage function that sends messages to the server, and then displays the response from the server. My issue is that after receiving a response, netcat is still waiting for data from server and won't close the connection. I already tried the -q argument, and I don't get my responses with it, the -w

Sending a hex string to a remote via netcat

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问题 I've got some binary commands (which I'm representing as hex) that I need to send to a remote device (it's an embedded data collection device) and observe the reply. It's easy to connect to it with netcat nc -v 192.168.200.34 19000 and it sits there happy as a clam. The hex string I need to type in terminal and then send is something like: 02:45:31:38:03:34:43:0d:0a Where 02 is STX, 03 is ETX and so on. But when I type this into my netcat window (with or without spaces , with or without the

Sending a hex string to a remote via netcat

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Netty实战十三之使用UDP广播事件

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1、UDP的基础知识我们将会把重点放在一个无连接协议即用户数据报协议（UDP）上，它通常用在性能至关重要并且能够容忍一定的数据报丢失的情况下。面向连接的传输（如TCP）管理了两个网络端点之间的连接的建立，在连接的生命周期内的有序和可靠的消息传输，以及最后，连接的有序终止。相比之下，在类似于UDP这样的无连接协议中，并没有持久化连接这样的概念，并且每个消息（一个UDP数据报）都是一个单独的传输单元。此外，UDP也没有TCP的纠错机制，其中每个节点都将确认它们所接收到的包，而没有被确认的包将会被发送方重新传输。通过类比，TCP连接就像打电话，其中一系列的有序消息将会在两个方法上流动，相反，UDP则类似于往邮箱中投入一叠明信片。你无法知道它们将以何种顺序到达它们的目的地，或者它们是否所有的都能够到达它们的目的地。 UDP的这些方面可能会让你感觉到严重的局限性，但是它们也解释了为何它会比TCP快那么多：所有的握手以及消息管理机制的开销已经被消除了。显然，UDP很适合那些能够处理或者容忍消息丢失的应用程序，但可能不适合那些处理金融交易的应用程序。 2、UDP广播到目前为止，我们所有的例子采用的都是一种叫做单播的传输模式，定义为发送消息给一个由唯一的地址所标识的单一的网络目的地。面向连接的协议和无连接协议都支持这种模式。 UDP提供了向多个接收者发送消息的额外传输模式：多播—

Netty实战十三之使用UDP广播事件

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Linux系统使用ss命令查看端口状态

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Linux系统使用ss命令查看端口状态目录 1.可用工具 2.ss帮助 2.1 选项分类说明 2.2 过滤选项family 2.3 过滤选项state 2.4 状态之间的关系 3.ss的使用 3.1 使用示例 3.2 过滤 3.2.1 状态过滤 3.2.2 通过family过滤 3.2.3 使用地址和端口过滤 3.3 常用组合 1.可用工具逐渐淘汰的 netstat 命令在 net-tools 软件包里(多年没有维护；效率很低) 逐渐成为主流的 ss 命令在 iproute2 软件包里(对常用网络命令做了改进和优化) ArchLinux已弃用"net-tools"，转而使用"iproute2" 弃用命令 > 替换命令 arp > ip n ifconfig > ip a, ip link, ip -s netstat > ss, ip route, ip -s link route > ip route 详见： https://www.cnblogs.com/sztom/articles/10764994.html 不推荐使用的Linux网络命令及其替代品 2.ss帮助 $ ss -h -h, --help this message 帮助信息 -V, --version output version information 输出版本信息 -n, --numeric don't

Netcat bidirectional communication

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问题 The goal which I am attempting to achieve is for a client to send the following command to a server: echo "Hello" | nc IP Port Upon receiving the "Hello" keyword, the server which is listening using: nc -nlp port should then send a response "Holla" back to the client. I have tried the following, none of which work in my instance: run a command conditionally with netcat and grep Is a conditional response possible with netcat How to respond conditionally based on the request when using netcat

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