socat:通过 TTY 隧道 IP [英] socat: tunnel IP through TTY

问题描述

是否可以使用 socat 实用程序在类似 ttyS0 的串行(调制解调器)设备上获得双向 IP 隧道?我尝试使用 TUN 选项，但仍然无法得到结果.

Is it possible to get an bidirectional IP-tunnel over ttyS0-like serial (modem) devices with the socat utility? I tried to use TUN option but still can't get the result.

欢迎任何建议:)

更新:

PC1:

socat /dev/ttyUSB0,raw,echo=0,b57600,clocal TUN:192.168.1.1/24,up

PC2:

socat /dev/ttyUSB0,raw,echo=0,b57600,clocal TUN:192.168.1.2/24,up

在那之后，我看到 tun0 接口在两端都有正确的地址，但我无法从其他接口 ping 通.取而代之的是，当我使用 ping -c 1 192.168.1.1 发送数据时，远程 socat 进程退出并且它的 tun0 设备被破坏.有什么建议吗?..

After that, I have seen tun0 interfaces with proper addresses on both ends but I can't ping one from other. Instead of that, when I send data with ping -c 1 192.168.1.1 remote socat process exits and it's tun0 device destroyed. Any suggestions?..

更新2:

当我们尝试仅使用 socat 建立 TCP/IP 串行隧道时，会出现框架问题.socat 的开发者 Gerhard Rieger 告诉我:

There is a framing problem when we try to make TCP/IP tunnel over serial with only socat. Gerhard Rieger, the socat's developer, says me that:

恐怕你是对的.屯通过数据报套接字工作，并且 - 通过运气 - 也超过管道.但是过串行线的数据包边界可能消失，这在发送时是致命的tun接口上的数据输出.

I am afraid that you are right. tun over datagram socket works, and - by luck - also over pipes. But over the serial line the packet boundaries may vanish and this is fatal when sending the data out on the tun interface.

我无法提供基于 socat 的解决方案现在，对不起.但是，我会尝试稍后整合一些框架第 2 版发布.

I cannot offer a socat based solution now, sorry. However, I will try to integrate some framing in a later version 2 release.

推荐答案

哈哈，我工作，但需要一些魔法:)

Ha-ha, I works but there needs to be some magic :)

所以，配置第一个节点:

So, configure the 1st peer with:

PC1:
1) slattach -L -s 57600 -p slip /dev/ttyUSB0 &
2) ifconfig sl0 up
3) socat TUN:192.168.1.1/24,up INTERFACE:sl0 &

...以及第二个对等点上的类似内容:

... and something like that on the 2nd peer:

PC2:
1) slattach -L -s 57600 -p slip /dev/ttyUSB0 &
2) ifconfig sl0 up
3) socat TUN:192.168.1.2/24,up INTERFACE:sl0 &

现在，您可以成功地从另一台 PC ping 通:

And now, you can successfully ping one PC from another:

PC1:
1) ping -c 5 192.168.1.2

PING 192.168.1.2 (192.168.1.2) 56(84) bytes of data.
64 bytes from 192.168.1.2: icmp_req=1 ttl=64 time=348 ms
64 bytes from 192.168.1.2: icmp_req=2 ttl=64 time=551 ms
64 bytes from 192.168.1.2: icmp_req=3 ttl=64 time=557 ms
64 bytes from 192.168.1.2: icmp_req=4 ttl=64 time=549 ms
64 bytes from 192.168.1.2: icmp_req=5 ttl=64 time=348 ms

--- 192.168.1.2 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4003ms
rtt min/avg/max/mdev = 348.116/471.143/557.128/100.177 ms

由于 slattach 的使用，这有点棘手，但实际上任何其他解决方案都必须使用类似 slip 之类的东西来组织串行线路上的帧.例如，PPP 使用类似 HDLC 的帧.

It's a little bit tricky because of slattach use but in fact any other solution must use something like slip to organize framing over the serial line. For example, PPP use HDLC-like frames.

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