Linux 使用BusyBox 版本的netcat 监听tcp 端口
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Using BusyBox version of netcat for listening tcp port
提问by arapEST
I need to listen some arbitrary port inside the Linux embedded box. I chose port 6660 because it is meant for uncrypted connections anyway and since the Linux box running customized Linux OS there are not many ports open. I found out that netcat (nc on command line) would be the easiest and the best ready to go solution for that, so I do not have to start programming some C program for that purpose.
我需要在 Linux 嵌入式盒子内监听一些任意端口。我选择了端口 6660，因为它无论如何都是用于未加密的连接，而且由于运行自定义 Linux 操作系统的 Linux 机器，没有多少端口打开。我发现 netcat（命令行上的 nc）将是最简单和最好的解决方案，因此我不必为此开始编写一些 C 程序。
I managed to grasp the command and options and I implemented simplest way to listen plain text on my PC from another PC like this:
我设法掌握了命令和选项，并实现了从另一台 PC 上在我的 PC 上收听纯文本的最简单方法，如下所示：
sven@sven:~$ nc 192.168.4.110 6660
sven@sven:~$ hello there!
anotherUser@userg:~$ nc -l -p 6660
anotherUser@userg:~$ hello there!
But the case is that the netcat tool is coming with the busybox package on that Linux box. And I am not sure what would be the syntax how to listen a port (6660 for example). I always get the same dialog:
但实际情况是，netcat 工具随 Linux 机器上的 busybox 包一起提供。而且我不确定如何监听端口（例如 6660）的语法是什么。我总是得到相同的对话框：
~ # nc -l -p 6660
BusyBox v1.17.1 (Debian 1:1.17.1-8) multi-call binary.
Usage: nc [IPADDR PORT]
Open a pipe to IP:PORT
Also I've tried many other ways how to implement listening but cant get it done. I assume at least it would give me any options? also
此外，我尝试了许多其他方法来实现聆听，但无法完成。我认为至少它会给我任何选择？还
nc -h
or
或者
nc --help
dont give any "minus" options
不要给出任何“减号”选项
But sending the text from Linux embedded box to my PC works:
但是将文本从 Linux 嵌入式框发送到我的 PC 是可行的：
~ # nc 192.168.4.130 6660
fsdf
tere
^C
~ #
sven@sven:~$ nc -l -p 6660
fsdf
tere
Linux embedded box has fully functional net connection inside the same local network and has existing eth0 and lo links
Linux 嵌入式盒在同一本地网络内具有功能齐全的网络连接，并具有现有的 eth0 和 lo 链接
eth0 Link encap:Ethernet HWaddr D0:E3:47:00:03:5F
inet addr:192.168.4.179 Bcast:192.168.4.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:28046281 errors:0 dropped:0 overruns:0 frame:0
TX packets:428464 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2458890234 (2.2 GiB) TX bytes:83021395 (79.1 MiB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:2282 errors:0 dropped:0 overruns:0 frame:0
TX packets:2282 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:444956 (434.5 KiB) TX bytes:444956 (434.5 KiB)
T??v?ite!
T??v?ite！
采纳答案by jmtd
Here's the manual page for busybox's nc implementation.
这是busybox nc implementation 的手册页。
The correct syntax is
正确的语法是
nc -l -p <port>
The issue is, I think, that your version of busybox is compiled without nc listening capabilities. Indeed there's a config option at build time, NC_SERVER, that needs to be enabled to turn that feature on.
问题是，我认为，您的 busybox 版本是在没有 nc 侦听功能的情况下编译的。实际上，在构建时有一个配置选项NC_SERVER，需要启用才能打开该功能。
Can you build another nc, perhaps from this version, and copy the binary onto your embedded host? You may need to build a cross-compiler environment.
您能否nc从这个版本构建另一个，并将二进制文件复制到您的嵌入式主机上？您可能需要构建一个交叉编译器环境。
