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Sending data to Unix socket failing unless proxied with socat via UDP

How can I communicate with a Unix domain socket via the shell on Debian Squeeze?Emulate console by sending data on one UDP port, and receive text from anotherHow does moving a unix domain socket enable socat to monitor traffic?What happens with unix stream ancillary data on partial reads?UDP Port Fowarding: channel 2: open failed: connect failed: Connection refusedHow can I repeatedly send the contents of a file via socat / ncat to a socketUnix Domain Socket with VMControling a PC via tcp/udp commands necat/socatBuilding a Unix socket bridge via TCPcreate a UDP to serial bridge with socatproblem piping data into nc

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I'm trying to debug why data isn't being sent over a Unix Domain Socket.

I have 2 applications which should be communicating over a UDS but aren't.

To test I've done the following:

Using socat, I listen on a socket like this:

socat -x -u UNIX-RECV:/tmp/dd.sock STDOUT

and using netcat to send data like this:

echo "hello" | nc -U -w1 /tmp/dd.sock

nothing happens.

But if I also set up socat as a proxy, to listen to a UDP port, and write that to the socket like this:

socat -s -u UDP-RECV:9988 UNIX-SENDTO:/tmp/dd.sock

Then sending via netcat to the UDP port works:

echo "Hello" | nc -u localhost 9988

I've also been able to get my client application to write UDP to the proxy and it's successful where is wasn't when writing to the unix socket.

I would like to understand why socat doesn't receive data written to it by nc, but does if I proxy over UDP.

Using Amazon Linux
4.14.101-75.76.amzn1.x86_64

edited 2 days ago

asked 2 days ago

Will

1084

New contributor

@RuiFRibeiro . I mentioned the applications for background. My example which demonstrates the problem using socat and nc reproduces the problem. I shall update the question to make the question more clear.

– Will
2 days ago

add a comment |

I'm trying to debug why data isn't being sent over a Unix Domain Socket.

I have 2 applications which should be communicating over a UDS but aren't.

To test I've done the following:

Using socat, I listen on a socket like this:

socat -x -u UNIX-RECV:/tmp/dd.sock STDOUT

and using netcat to send data like this:

echo "hello" | nc -U -w1 /tmp/dd.sock

nothing happens.

But if I also set up socat as a proxy, to listen to a UDP port, and write that to the socket like this:

socat -s -u UDP-RECV:9988 UNIX-SENDTO:/tmp/dd.sock

Then sending via netcat to the UDP port works:

echo "Hello" | nc -u localhost 9988

I've also been able to get my client application to write UDP to the proxy and it's successful where is wasn't when writing to the unix socket.

I would like to understand why socat doesn't receive data written to it by nc, but does if I proxy over UDP.

Using Amazon Linux
4.14.101-75.76.amzn1.x86_64

edited 2 days ago

asked 2 days ago

Will

1084

New contributor

@RuiFRibeiro . I mentioned the applications for background. My example which demonstrates the problem using socat and nc reproduces the problem. I shall update the question to make the question more clear.

– Will
2 days ago

add a comment |

I'm trying to debug why data isn't being sent over a Unix Domain Socket.

I have 2 applications which should be communicating over a UDS but aren't.

To test I've done the following:

Using socat, I listen on a socket like this:

socat -x -u UNIX-RECV:/tmp/dd.sock STDOUT

and using netcat to send data like this:

echo "hello" | nc -U -w1 /tmp/dd.sock

nothing happens.

But if I also set up socat as a proxy, to listen to a UDP port, and write that to the socket like this:

socat -s -u UDP-RECV:9988 UNIX-SENDTO:/tmp/dd.sock

Then sending via netcat to the UDP port works:

echo "Hello" | nc -u localhost 9988

I've also been able to get my client application to write UDP to the proxy and it's successful where is wasn't when writing to the unix socket.

I would like to understand why socat doesn't receive data written to it by nc, but does if I proxy over UDP.

Using Amazon Linux
4.14.101-75.76.amzn1.x86_64

edited 2 days ago

asked 2 days ago

Will

1084

New contributor

I'm trying to debug why data isn't being sent over a Unix Domain Socket.

I have 2 applications which should be communicating over a UDS but aren't.

To test I've done the following:

Using socat, I listen on a socket like this:

socat -x -u UNIX-RECV:/tmp/dd.sock STDOUT

and using netcat to send data like this:

echo "hello" | nc -U -w1 /tmp/dd.sock

nothing happens.

But if I also set up socat as a proxy, to listen to a UDP port, and write that to the socket like this:

socat -s -u UDP-RECV:9988 UNIX-SENDTO:/tmp/dd.sock

Then sending via netcat to the UDP port works:

echo "Hello" | nc -u localhost 9988

I've also been able to get my client application to write UDP to the proxy and it's successful where is wasn't when writing to the unix socket.

I would like to understand why socat doesn't receive data written to it by nc, but does if I proxy over UDP.

Using Amazon Linux
4.14.101-75.76.amzn1.x86_64

socat unix-sockets nc

edited 2 days ago

asked 2 days ago

Will

1084

New contributor

edited 2 days ago

asked 2 days ago

Will

1084

New contributor

edited 2 days ago

asked 2 days ago

Will

1084

New contributor

asked 2 days ago

Will

1084

asked 2 days ago

Will

1084

New contributor

Will is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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@RuiFRibeiro . I mentioned the applications for background. My example which demonstrates the problem using socat and nc reproduces the problem. I shall update the question to make the question more clear.

– Will
2 days ago

add a comment |

@RuiFRibeiro . I mentioned the applications for background. My example which demonstrates the problem using socat and nc reproduces the problem. I shall update the question to make the question more clear.

– Will
2 days ago

@RuiFRibeiro . I mentioned the applications for background. My example which demonstrates the problem using socat and nc reproduces the problem. I shall update the question to make the question more clear.

– Will
2 days ago

add a comment |

1 Answer
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You have set up a listening datagram socket with socat+UNIX-RECV: and are attempting to talk to it via a stream socket with nc.

The second scenario works because in that case you added the missing -u flag to nc, so that both it and socat were employing a datagram socket. It wasn't anything to do with there being a proxy.

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