BASH - sync-snort2c-tables.sh

sync-snort2c-tables.sh

#!/bin/bash

# ==============================
# User-defined variables
# ==============================

# Space-separated list of source pfSense IPs
IP_SOURCE_PFSENSE="1.2.3.4 5.6.7.8"

# Destination pfSense IP
IP_DESTINATION_PFSENSE="10.11.12.13"

# SSH user (usually root on pfSense)
SSH_USER="root"

# Name of the PF table created/managed by snort2c
PF_TABLE_NAME="snort2c_blacklist"

# Temporary working directory
WORKDIR="/tmp/snort2c_merge"
MERGED_FILE="${WORKDIR}/merged_ips.txt"

# ==============================
# Safety checks
# ==============================

set -euo pipefail

mkdir -p "${WORKDIR}"
> "${MERGED_FILE}"

# ==============================
# Fetch IPs from source pfSense
# ==============================

echo "[*] Fetching IP lists from source pfSense firewalls..."

for SRC_IP in ${IP_SOURCE_PFSENSE}; do
    echo "    - Connecting to ${SRC_IP}"

    ssh "${SSH_USER}@${SRC_IP}" \
        "pfctl -t ${PF_TABLE_NAME} -T show" \
        >> "${MERGED_FILE}"
done

# ==============================
# Merge and deduplicate
# ==============================

echo "[*] Merging and deduplicating IPs..."

sort -u "${MERGED_FILE}" -o "${MERGED_FILE}"

IP_COUNT=$(wc -l < "${MERGED_FILE}")
echo "    -> Total unique IPs: ${IP_COUNT}"

# ==============================
# Inject into destination pfSense
# ==============================

echo "[*] Injecting merged list into destination pfSense (${IP_DESTINATION_PFSENSE})..."

ssh "${SSH_USER}@${IP_DESTINATION_PFSENSE}" \
    "pfctl -t ${PF_TABLE_NAME} -T replace -f -" \
    < "${MERGED_FILE}"

echo "[✓] Injection completed successfully."