tcpexec [OPTION] [IPADDR:]PORT COMMAND ...

tcpexec: a minimal, UCSPI inetd

tcpexec attaches the standard input and output of a command to a TCP socket:

• exec(3): data is not proxied via an intermediary process

• SO_REUSEPORT: multiple processes concurrently listen and accept data on the same port

$ tcpexec 9090 cat

$ tcpexec 127.0.0.1:9090 cat

$ tcpexec ::1:9090 env

An echo server allowing 3 concurrent connections:

service/
├── echo1
│   └── run
├── echo2
│   └── run
└── echo3
    └── run

• service/echo1/run

#!/bin/sh

exec tcpexec 127.0.0.1:9090 cat

• service/echo2/run

#!/bin/sh

exec tcpexec 127.0.0.1:9090 cat

• service/echo3/run

#!/bin/sh

exec tcpexec 127.0.0.1:9090 cat

Then run:

svscan service

make

#### static executable using musl
./musl-make

-v, --verbose : write additional messages to stderr

-h, --help : usage summary

PROTO : protocol, always set to TCP

TCPREMOTEIP : source IPv4 or IPv6 address

TCPREMOTEPORT : source port

TCPLOCALIP : destination IPv4 or IPv6 address

TCPLOCALPORT : destination port