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#!/bin/sh
# shellcheck disable=SC2034,SC3043,SC3060
log() {
local _level="$1"
local _message="$2"
/usr/bin/logger -p "daemon.${_level}" -t "forwarding[$$]" "${_message}"
}
capture_output() {
local _type="$1"
local _id="$2"
while read -r message; do
log "${_type}" "[${_id}] ${message}"
done
}
_block=
terminate() {
local _sleep
if [ -n "${_block}" ]; then
log info "Received signal for termination, stopping PID ${_block}."
/bin/kill -KILL "${_block}"
log debug "Killed: $?"
_sleep=$(/bin/ps -o ppid,comm,pid \
| /bin/grep -F "1 sleep" \
| /usr/bin/head -1 \
| /bin/sed "s@[ ]*1[ ]*sleep[ ]*@@")
log info "Stopping the orphaned sleep as PID ${_sleep}."
/bin/kill -KILL "${_sleep}"
log debug "Killed: $?"
else
log warn "Nothing is blocked, nothing to do."
fi
}
trap terminate TERM
while read -r _line; do
_parameters=$(echo "${_line}" | /bin/sed '/^[[:blank:]]*#/d;s/#.*//')
[ -z "${_parameters}" ] && continue
log info "Launching socat with parameters: [${_parameters}]"
/usr/bin/socat ${_parameters} 2>&1 \
| capture_output debug socat &
done < /media/etc/forwarding.conf
(while /bin/true; do /bin/sleep 365d; done) &
_block=$!
log info "Waiting for PID ${_block} to stop."
wait "${_block}"
_socats=$(/usr/bin/pgrep -P $$ socat)
log info "Stopping, own socat processes: [${_socats}]"
# shellcheck disable=SC2086
[ -n "${_socats}" ] && /bin/kill -TERM ${_socats}
log info "Finished."
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