#!/usr/bin/env bash
# mx_lookup.sh - MX record lookup functions for exitrace
# Maintainer: ljp

# MX record lookup with A/AAAA resolution
show_mx_records() {
  local domain="$1"
  
  if ! command -v dig >/dev/null 2>&1; then
    echo "(Hinweis) dig nicht gefunden, MX-Ausgabe übersprungen." >&2
    return 1
  fi
  
  echo "== MX für ${domain} =="
  dig +short MX "$domain" | sort -n || {
    echo "Fehler: MX-Abfrage für $domain fehlgeschlagen" >&2
    return 1
  }
  
  echo "-- A/AAAA der MX:"
  while read -r mx; do
    [[ -n "$mx" ]] || continue
    local host="${mx#* }"
    printf "%-35s | " "$host"
    
    # A records
    local a_records
    a_records="$(dig +short A "$host" 2>/dev/null | paste -sd, -)"
    printf "%s" "${a_records:-"-"}"
    
    printf " | "
    
    # AAAA records  
    local aaaa_records
    aaaa_records="$(dig +short AAAA "$host" 2>/dev/null | paste -sd, -)"
    printf "%s\n" "${aaaa_records:-"-"}"
    
  done < <(dig +short MX "$domain" | sort -n)
  
  echo "========================================================================"
}

# Built with the help of Claude Code