#!/bin/bash

# Define variables (replace with your credentials)
WORK_DIR="/path/to/workdir"  # Update with your desired working directory
LOGIN_OVH="your_dynhost_login@domain.tld"
PWD_OVH="your_dynhost_password"
URL_OVH="subdomain.domain.tld"

# Define IP retrieval URLs
ipv4_url="https://api.ipify.org"
ipv6_url="https://api6.ipify.org"

# Define IP regex patterns
ipv4_pattern="^([1-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])(\.([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])){3}$"
ipv6_pattern="^([0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}$"  # Simple IPv6 regex (can be improved)

# Function to update OVH record (CORRECTED)
update_ovh_ddns() {
  local ip="$1"
  local ip_type="$2"

  echo "Updating $ip_type address ($ip) at OVH..."

  # Create the authentication string
  local auth_string="$LOGIN_OVH:$PWD_OVH"

  # Encode the authentication string using base64
  local encoded_auth=$(printf "%s" "$auth_string" | base64)

  # Construct the Authorization header
  local auth_header="Authorization: Basic $encoded_auth"

  local update_url="https://dns.eu.ovhapis.com/nic/update?system=dyndns&hostname=$URL_OVH&myip=$ip"

  # Use curl with the corrected header
  local response=$(curl -s -H "$auth_header" "$update_url")

  if [[ "$response" == "good $ip" || "$response" == "nochg $ip" ]]; then
    echo "OVH update successful for $ip_type. OVH response: $response"
    echo "$ip" > "$WORK_DIR/maj_${ip_type}_ip.txt"
  elif [[ "$response" == "abuse" ]]; then
    echo "OVH update failed for $ip_type. OVH response: $response - Too many updates, wait a bit"
  else
    echo "Error updating OVH for $ip_type: $response"
  fi
}

# Check if work directory exists
if [ ! -d "$WORK_DIR" ]; then
  echo "Work directory doesn't exist, creating..."
  mkdir -p "$WORK_DIR"
  echo "0.0.0.0" > "$WORK_DIR/maj_ipv4_ip.txt"
  echo "::" > "$WORK_DIR/maj_ipv6_ip.txt"  # Default value for IPv6
fi

# Process IPv4
ipv4=$(curl -s "$ipv4_url" | tr -d '\r')
if [[ $ipv4 =~ $ipv4_pattern ]]; then
  old_ipv4=$(cat "$WORK_DIR/maj_ipv4_ip.txt" || echo "0.0.0.0")
  if [[ $ipv4 != $old_ipv4 ]]; then
    echo "** Your IPv4 address has changed **"
    echo "New IPv4: $ipv4"
    echo "Old IPv4: $old_ipv4"
    update_ovh_ddns "$ipv4" "ipv4"
  else
    echo "Your IPv4 address hasn't changed."
  fi
else
  echo "Warning: Retrieved IPv4 address ($ipv4) is not in a valid format."
fi

# Process IPv6
ipv6=$(curl -s "$ipv6_url" | tr -d '\r')
if [[ $ipv6 =~ $ipv6_pattern ]]; then
  old_ipv6=$(cat "$WORK_DIR/maj_ipv6_ip.txt" || echo "::")
  if [[ $ipv6 != $old_ipv6 ]]; then
    echo "** Your IPv6 address has changed **"
    echo "New IPv6: $ipv6"
    echo "Old IPv6: $old_ipv6"
    update_ovh_ddns "$ipv6" "ipv6"
  else
    echo "Your IPv6 address hasn't changed."
  fi
else
  echo "Warning: Retrieved IPv6 address ($ipv6) is not in a valid format."
fi