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Backport option to call external command on port change.

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Add support for the PF_POST_COMMAND environment variable in
port_forwarding.sh. This will cause an external command to be called
with the new forwarding port and the original forwarding port (as
command-line arguments) every time the forwarding port changes.

Use cases:
- Update firewall configuration.
- Update configuration of anything that needs to bind to the correct
  port.
This commit is contained in:
Marco Paganini 2021-11-20 12:13:34 -08:00
parent e956c57849
commit a5334fe853
1 changed files with 15 additions and 0 deletions
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15
port_forwarding.sh
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@ -130,6 +130,8 @@ Trying to bind the port... "
# We will repeat this request every 15 minutes, in order to keep the port
# alive. The servers have no mechanism to track your activity, so they
# will just delete the port forwarding if you don't send keepalives.
old_port=0
while true; do
bind_port_response="$(curl -Gs -m 5 \
--connect-to "$PF_HOSTNAME::$PF_GATEWAY:" \
@ -151,6 +153,19 @@ while true; do
echo -e Expires on'\t'"${red}$(date --date="$expires_at")${nc}"
echo -e "\n${green}This script will need to remain active to use port forwarding, and will refresh every 15 minutes.${nc}\n"
if [[ "${PF_POST_COMMAND}" ]] && [[ "${port}" != "${old_port}" ]]; then
echo -e "${green}Note: Port has changed from ${old_port} to ${port}. Running PF_POST_COMMAND.${nc}"
if ! "${PF_POST_COMMAND}" "${port}" "${old_port}"; then
echo -e "${red}Warning: "${PF_POST_COMMAND}" returned non-zero.${nc}"
fi
old_port="${port}"
fi
echo -e Forwarded port'\t'${green}$port${nc}
echo -e Refreshed on'\t'${green}$(date)${nc}
echo -e Expires on'\t'${red}$(date --date="$expires_at")${nc}
echo -e "\n${green}This script will need to remain active to use port forwarding, and will refresh every 15 minutes.${nc}\n"
# sleep 15 minutes
sleep 900
done