socat cheat sheet

socat_cheat_sheet.bash

# this example sets up a tunnel on the remote system on port 8090 to the system initiating the ssh connection on port 8080
#
# starting socat ipv4 tunnel between ports on remote system (forking and lock file enabled with socat)
# and killing socat with control-c / tunnel close
#
# tags : proxy port 

# most direct approach 
ssh -t user@remote.system -R 8080:127.0.0.1:8080 "socat -L/tmp/socat.lock tcp4-listen:8090,reuseaddr,fork tcp:localhost:8080"

# more complex
ssh -t user@remote.system -R 8080:127.0.0.1:8080 "(socat -L/tmp/socat.lock tcp4-listen:8090,reuseaddr,fork tcp:localhost:8080 & ) 2> /dev/null ; sleep infinity"

# more compatible
ssh -t user@remote.system -R 8080:127.0.0.1:8080 "(socat -L/tmp/socat.lock tcp4-listen:8090,reuseaddr,fork tcp:localhost:8080 & ) 2> /dev/null ; trap 'exit 0' SIGINT ; while true ; do sleep 100 ; done"