caster

Publish stdout via http.

Why?

caster is a command line server for easy exposing of local services to the internet.

It was initially conceived for running diagnostics on remote machines, where ssh was either not possible or not preferred.

It's dockerized and offers a very small footprint, <10MB.

Usage

Server

$ docker run --rm -it -p 8080:8080 mihaigalos/caster

To avoid i.e. leaking sensitive information such as passwords, you can pass the --secure flag. This will only permit access to named endpoints such as /ping or /curl.

Client

Test if the remote endpoint can reach the internet:

$ curl localhost:8080 -XPOST -d 'ping -c 3 google.com'

PING google.com (142.251.36.206): 56 data bytes
64 bytes from 142.251.36.206: seq=0 ttl=117 time=30.143 ms
64 bytes from 142.251.36.206: seq=1 ttl=117 time=19.261 ms
64 bytes from 142.251.36.206: seq=2 ttl=117 time=15.664 ms

--- google.com ping statistics ---
3 packets transmitted, 3 packets received, 0% packet loss
round-trip min/avg/max = 15.664/21.689/30.143 ms

Test access, ignore TLS/SSL:

$ curl localhost:8080 -XPOST -d 'curl -sSLk news.ycombinator.com'

<data>

The following are aliases for the above:

$ curl localhost:8080/ping -XPOST -d '-c 3 google.com'
$ curl localhost:8080/curl -XPOST -d '-sSLk news.ycombinator.com'