Free ports 80 and 443 on Synology NAS

free_ports.sh

#! /bin/bash

# NEWLY ADDED BACKUP FUNCTIONALITY IS NOT FULLY TESTED YET, USE WITH CARE, ESPECIALLY DELETION
# Developed for DSM 6 - 7.0.1. Not tested on other versions.
# Steps to install
# Save this script in one of your shares
# Edit it according to your requirements
# Backup /usr/syno/share/nginx/ as follows:
# # cd /usr/syno/share/
# # tar cvf ~/nginx.tar nginx
# Run this script as root
# Reboot and ensure everything is still working
# If not, restore the backup and post a comment on this script's gist page
# If it did, schedule it to run as root at boot
#   through Control Panel -> Task Scheduler

HTTP_PORT=81
HTTPS_PORT=444

BACKUP_FILES=true # change to false to disable backups
BACKUP_DIR=/volume1/apps/free_ports/backup
DELETE_OLD_BACKUPS=false # change to true to automatically delete old backups.
KEEP_BACKUP_DAYS=30

DATE=$(date +%Y-%m-%d-%H-%M-%S)
CURRENT_BACKUP_DIR="$BACKUP_DIR/$DATE"

if [ "$BACKUP_FILES" == "true" ]; then
  mkdir -p "$CURRENT_BACKUP_DIR"
  cp /usr/syno/share/nginx/*.mustache "$CURRENT_BACKUP_DIR"
fi

if [ "$DELETE_OLD_BACKUPS" == "true" ]; then
  find "$BACKUP_DIR/" -type d -mtime +$KEEP_BACKUP_DAYS -exec rm -r {} \;
fi

sed -i "s/^\([ \t]\+listen[ \t]\+[]:[]*\)80\([^0-9]\)/\1$HTTP_PORT\2/" /usr/syno/share/nginx/*.mustache
sed -i "s/^\([ \t]\+listen[ \t]\+[]:[]*\)443\([^0-9]\)/\1$HTTPS_PORT\2/" /usr/syno/share/nginx/*.mustache

if which synoservicecfg; then
  synoservicecfg --restart nginx
else
  synosystemctl restart nginx
fi

echo "Made these changes:"

diff /usr/syno/share/nginx/ $CURRENT_BACKUP_DIR 2>&1 | tee $CURRENT_BACKUP_DIR/changes.log

I'm on "DSM 7.3.2-86009 Update 4", and a truncated version of this script still works:

case "${1}" in
    start)
        sed -i -E '/\blisten\b/{ s/\b80\b/1080/g; s/\b443\b/1443/g; }' /usr/syno/share/nginx/*.mustache
        synosystemctl restart nginx
        ;;
    stop)
        sed -i -E '/\blisten\b/{ s/\b1080\b/80/g; s/\b1443\b/443/g; }' /usr/syno/share/nginx/*.mustache
        synosystemctl restart nginx
        ;;
    *)
        echo "Usage: $(basename $0) [ start | stop ]"
        exit 1
        ;;
esac

I'm not suggesting this shorter version is better. Some time in the past, I took the "then-current" suggestion and turned it into this, a script that lives in /usr/local/etc/rc.d/ and has been working ever since. The last time I edited the file was mid-2022, and through several DSM updates and it still works. Both this set of regexes and the current-gist work equally well, so I don't know what else could be affecting other users.