136 lines
2.7 KiB
Go
136 lines
2.7 KiB
Go
// SPDX-License-Identifier: BSD-3-Clause
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package main
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import (
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"errors"
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"fmt"
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"math/rand"
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"os"
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"strings"
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"time"
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cli "dns.froth.zone/awl/cmd"
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"dns.froth.zone/awl/pkg/query"
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"dns.froth.zone/awl/pkg/util"
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"github.com/miekg/dns"
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)
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var version = "DEV"
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func main() {
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if opts, code, err := run(os.Args); err != nil {
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// TODO: Make not ew
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if errors.Is(err, util.ErrNotError) || strings.Contains(err.Error(), "help requested") {
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os.Exit(0)
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} else {
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opts.Logger.Error(err)
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os.Exit(code)
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}
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}
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}
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func run(args []string) (opts *util.Options, code int, err error) {
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//nolint:gosec //Secure source not needed
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r := rand.New(rand.NewSource(time.Now().Unix()))
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opts, err = cli.ParseCLI(args, version)
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if err != nil {
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return opts, 1, fmt.Errorf("parse: %w", err)
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}
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var (
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resp util.Response
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keepTracing bool
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tempDomain string
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tempQueryType uint16
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)
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for ok := true; ok; ok = keepTracing {
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if opts.Trace {
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if keepTracing {
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opts.Request.Name = tempDomain
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opts.Request.Type = tempQueryType
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} else {
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tempDomain = opts.Request.Name
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tempQueryType = opts.Request.Type
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// Override the query because it needs to be done
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opts.Request.Name = "."
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opts.Request.Type = dns.TypeNS
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}
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}
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// Retry queries if a query fails
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for i := 0; i <= opts.Request.Retries; i++ {
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resp, err = query.CreateQuery(opts)
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if err == nil {
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keepTracing = opts.Trace && (!resp.DNS.Authoritative || (opts.Request.Name == "." && tempDomain != ".")) && resp.DNS.MsgHdr.Rcode == 0
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break
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} else if i != opts.Request.Retries {
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opts.Logger.Warn("Retrying request, error:", err)
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}
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}
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// Query failed, make it fail
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if err != nil {
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return opts, 9, fmt.Errorf("query: %w", err)
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}
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var str string
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if opts.JSON || opts.XML || opts.YAML {
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str, err = query.PrintSpecial(resp, opts)
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if err != nil {
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return opts, 10, fmt.Errorf("format print: %w", err)
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}
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} else {
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str, err = query.ToString(resp, opts)
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if err != nil {
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return opts, 15, fmt.Errorf("standard print: %w", err)
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}
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}
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fmt.Println(str)
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if keepTracing {
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var records []dns.RR
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if opts.Request.Name == "." {
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records = resp.DNS.Answer
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} else {
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records = resp.DNS.Ns
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}
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want := func(rr dns.RR) bool {
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temp := strings.Split(rr.String(), "\t")
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return temp[len(temp)-2] == "NS"
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}
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i := 0
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for _, x := range records {
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if want(x) {
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records[i] = x
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i++
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}
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}
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records = records[:i]
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randomRR := records[r.Intn(len(records))]
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v := strings.Split(randomRR.String(), "\t")
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opts.Request.Server = strings.TrimSuffix(v[len(v)-1], ".")
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opts.TLS = false
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opts.HTTPS = false
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opts.QUIC = false
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opts.RD = false
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opts.Request.Port = 53
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}
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}
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return opts, 0, nil
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}
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