#!/bin/sh
# OpenVPN Discovery Script (Arthur's Gold Standard)
# Outputs: {#VPN.USER}, {#VPN.SERVER}, {#VPN.REAL_IP}

JSON_OUTPUT="{\"data\":["
FIRST_ITEM=1

# Loop through all status logs
for logfile in /var/log/openvpn/status*.log; do
    [ -e "$logfile" ] || continue

    # Extract Server Name from Filename "status_SERVERNAME.log"
    # Note: Busybox filename parsing
    filename=$(basename "$logfile")
    # Remove prefix "status_" and suffix ".log"
    server_name=$(echo "$filename" | sed -e 's/^status_//' -e 's/\.log$//')

    # Read the file and parse "CLIENT_LIST" lines
    # Format: CLIENT_LIST,CommonName,RealAddress,VirtualAddress,BytesReceived,BytesSent,Since,Since(time_t),Username,ClientID,PeerID
    while IFS=, read -r type common_name real_address virtual_address bytes_rx bytes_tx since since_unix username client_id peer_id; do
        if [ "$type" = "CLIENT_LIST" ] && [ "$common_name" != "Common Name" ]; then
            # Extract IP only from RealAddress (IP:PORT)
            real_ip=$(echo "$real_address" | cut -d: -f1)
            
            # Append to JSON
            if [ $FIRST_ITEM -eq 0 ]; then JSON_OUTPUT="$JSON_OUTPUT,"; fi
            JSON_OUTPUT="$JSON_OUTPUT{\"{#VPN.USER}\":\"$common_name\",\"{#VPN.SERVER}\":\"$server_name\",\"{#VPN.REAL_IP}\":\"$real_ip\"}"
            FIRST_ITEM=0
        fi
    done < "$logfile"
done

JSON_OUTPUT="$JSON_OUTPUT]}"
echo "$JSON_OUTPUT"