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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"
"wait4x.dev/v3/internal/contextutil"
dns "wait4x.dev/v3/checker/dns/a"
"wait4x.dev/v3/waiter"
)
// NewACommand creates a new DNS A command
func NewACommand() *cobra.Command {
command := &cobra.Command{
Use: "A ADDRESS [-- command [args...]]",
Aliases: []string{"a"},
Short: "Check DNS A records for a given domain",
Long: "Check DNS A records to verify domain name resolution to IPv4 addresses. Supports checking against expected IPs and custom nameservers.",
Args: func(_ *cobra.Command, args []string) error {
if len(args) < 1 {
return errors.New("ADDRESS is required argument for the A command")
}
return nil
},
Example: `
# Check A records existence for a domain
wait4x dns A wait4x.dev
# Check A records with specific expected IPv4 addresses
wait4x dns A wait4x.dev --expect-ip 172.67.154.180
wait4x dns A wait4x.dev --expect-ip 172.67.154.180 --expect-ip 104.21.60.85
# Check A records using a custom nameserver
wait4x dns A wait4x.dev --expect-ip 172.67.154.180 -n gordon.ns.cloudflare.com
# Check A records with timeout and interval settings
wait4x dns A wait4x.dev --timeout 30s --interval 5s
# Invert the check (wait until records don't match)
wait4x dns A wait4x.dev --expect-ip 172.67.154.180 --invert-check`,
RunE: runA,
}
command.Flags().StringArray("expect-ip", []string{}, "Expected IPv4 addresses to match against A records")
return command
}
// runA is the command handler for the "dns A" command
func runA(cmd *cobra.Command, args []string) error {
nameserver, err := cmd.Flags().GetString("nameserver")
if err != nil {
return fmt.Errorf("failed to parse --nameserver flag: %w", err)
}
expectIPs, err := cmd.Flags().GetStringArray("expect-ip")
if err != nil {
return fmt.Errorf("failed to parse --expect-ip flag: %w", err)
}
logger, err := logr.FromContext(cmd.Context())
if err != nil {
return fmt.Errorf("failed to get logger from context: %w", err)
}
dc := dns.New(
args[0],
dns.WithExpectedIPV4s(expectIPs),
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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