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// Copyright 2019-2025 The Wait4X Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package dns provides the DNS command-line interface for the Wait4X application.
package dns
import (
"errors"
"fmt"
"github.com/go-logr/logr"
"github.com/spf13/cobra"
dns "wait4x.dev/v3/checker/dns/mx"
"wait4x.dev/v3/internal/contextutil"
"wait4x.dev/v3/waiter"
)
// NewMXCommand creates a new DNS MX command
func NewMXCommand() *cobra.Command {
command := &cobra.Command{
Use: "MX ADDRESS [-- command [args...]]",
Aliases: []string{"mx"},
Short: "Check DNS MX (mail exchanger) records for a given domain",
Long: "Check for the existence and validity of DNS MX (mail exchanger) records for a specified domain. MX records specify the mail servers responsible for receiving email on behalf of the domain.",
Args: func(_ *cobra.Command, args []string) error {
if len(args) < 1 {
return errors.New("ADDRESS is required argument for the MX command")
}
return nil
},
Example: `
# Check MX records existence
wait4x dns MX wait4x.dev
# Check MX records with expected domains
wait4x dns MX wait4x.dev --expect-domain 'route1.mx.cloudflare.net'
# Check MX records with multiple expected domains
wait4x dns MX wait4x.dev --expect-domain 'route1.mx.cloudflare.net' --expect-domain 'route2.mx.cloudflare.net'
# Check MX records by defined nameserver
wait4x dns MX wait4x.dev --expect-domain 'route1.mx.cloudflare.net' --nameserver 'gordon.ns.cloudflare.com'
# Check MX records with custom timeout and interval
wait4x dns MX wait4x.dev --timeout 30s --interval 5s`,
RunE: runMX,
}
command.Flags().StringArray("expect-domain", nil, "Expected domain names in MX records. Can be specified multiple times for multiple domains.")
return command
}
// runMX is the command handler for the "dns MX" command
func runMX(cmd *cobra.Command, args []string) error {
nameserver, err := cmd.Flags().GetString("nameserver")
if err != nil {
return fmt.Errorf("unable to parse --nameserver flag: %w", err)
}
expectDomains, err := cmd.Flags().GetStringArray("expect-domain")
if err != nil {
return fmt.Errorf("unable to parse --expect-domain flag: %w", err)
}
logger, err := logr.FromContext(cmd.Context())
if err != nil {
return fmt.Errorf("unable to get logger from context: %w", err)
}
dc := dns.New(
args[0],
dns.WithExpectedDomains(expectDomains),
dns.WithNameServer(nameserver),
)
return waiter.WaitContext(cmd.Context(),
dc,
waiter.WithTimeout(contextutil.GetTimeout(cmd.Context())),
waiter.WithInterval(contextutil.GetInterval(cmd.Context())),
waiter.WithInvertCheck(contextutil.GetInvertCheck(cmd.Context())),
waiter.WithLogger(logger),
)
}
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