240 lines
8.1 KiB
Go
240 lines
8.1 KiB
Go
// SPDX-License-Identifier: BSD-3-Clause
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package cli
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import (
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"errors"
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"fmt"
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"os"
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"runtime"
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"strconv"
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"strings"
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"time"
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"git.froth.zone/sam/awl/util"
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"github.com/miekg/dns"
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flag "github.com/stefansundin/go-zflag"
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)
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// ParseCLI parses arguments given from the CLI and passes them into an `Options`
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// struct.
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func ParseCLI(version string) (util.Options, error) {
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flag.CommandLine = flag.NewFlagSet(os.Args[0], flag.ContinueOnError)
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flag.Usage = func() {
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fmt.Println(`awl - drill, writ small
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Usage: awl name [@server] [record]
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<name> domain, IP address, phone number
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<record> defaults to A
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Arguments may be in any order, including flags.
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Dig-like +[no]commands are also supported, see dig(1) or dig -h
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Options:`)
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flag.PrintDefaults()
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}
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// CLI flags
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//
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// Remember, when adding a flag edit the manpage and the completions :)
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var (
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port = flag.Int("port", 0, "`port` to make DNS query (default: 53 for UDP/TCP, 853 for TLS/QUIC)", flag.OptShorthand('p'), flag.OptDisablePrintDefault(true))
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query = flag.String("query", "", "domain name to `query` (default: .)", flag.OptShorthand('q'))
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class = flag.String("class", "IN", "DNS `class` to query", flag.OptShorthand('c'))
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qType = flag.String("qType", "", "`type` to query (default: A)", flag.OptShorthand('t'))
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ipv4 = flag.Bool("4", false, "force IPv4", flag.OptShorthand('4'))
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ipv6 = flag.Bool("6", false, "force IPv6", flag.OptShorthand('6'))
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reverse = flag.Bool("reverse", false, "do a reverse lookup", flag.OptShorthand('x'))
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timeout = flag.Float32("timeout", 1, "Timeout, in `seconds`")
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retry = flag.Int("retries", 2, "number of `times` to retry")
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edns = flag.Bool("no-edns", false, "disable EDNS entirely")
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ednsVer = flag.Uint8("edns-ver", 0, "set EDNS version")
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dnssec = flag.Bool("dnssec", false, "enable DNSSEC", flag.OptShorthand('D'))
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expire = flag.Bool("expire", false, "set EDNS expire")
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nsid = flag.Bool("nsid", false, "set EDNS NSID", flag.OptShorthand('n'))
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cookie = flag.Bool("no-cookie", false, "disable sending EDNS cookie (default: cookie sent)")
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tcpKeepAlive = flag.Bool("keep-alive", false, "send EDNS TCP keep-alive")
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udpBufSize = flag.Uint16("buffer-size", 1232, "set EDNS UDP buffer size", flag.OptShorthand('b'))
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mbzflag = flag.String("zflag", "0", "set EDNS z-flag `value`")
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subnet = flag.String("subnet", "", "set EDNS client subnet")
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padding = flag.Bool("pad", false, "set EDNS padding")
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truncate = flag.Bool("no-truncate", false, "ignore truncation if a UDP request truncates (default: retry with TCP)")
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tcp = flag.Bool("tcp", false, "use TCP")
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dnscrypt = flag.Bool("dnscrypt", false, "use DNSCrypt")
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tls = flag.Bool("tls", false, "use DNS-over-TLS", flag.OptShorthand('T'))
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https = flag.Bool("https", false, "use DNS-over-HTTPS", flag.OptShorthand('H'))
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quic = flag.Bool("quic", false, "use DNS-over-QUIC", flag.OptShorthand('Q'))
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tlsHost = flag.String("tls-host", "", "Server name to use for TLS verification")
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noVerify = flag.Bool("tls-no-verify", false, "Disable TLS cert verification")
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aaflag = flag.Bool("aa", false, "set/unset AA (Authoratative Answer) flag (default: not set)")
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adflag = flag.Bool("ad", false, "set/unset AD (Authenticated Data) flag (default: not set)")
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cdflag = flag.Bool("cd", false, "set/unset CD (Checking Disabled) flag (default: not set)")
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qrflag = flag.Bool("qr", false, "set/unset QR (QueRy) flag (default: not set)")
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rdflag = flag.Bool("rd", true, "set/unset RD (Recursion Desired) flag (default: set)", flag.OptDisablePrintDefault(true))
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raflag = flag.Bool("ra", false, "set/unset RA (Recursion Available) flag (default: not set)")
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tcflag = flag.Bool("tc", false, "set/unset TC (TrunCated) flag (default: not set)")
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zflag = flag.Bool("z", false, "set/unset Z (Zero) flag (default: not set)", flag.OptShorthand('z'))
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short = flag.Bool("short", false, "print just the results", flag.OptShorthand('s'))
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json = flag.Bool("json", false, "print the result(s) as JSON", flag.OptShorthand('j'))
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xml = flag.Bool("xml", false, "print the result(s) as XML", flag.OptShorthand('X'))
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yaml = flag.Bool("yaml", false, "print the result(s) as yaml", flag.OptShorthand('y'))
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noC = flag.Bool("no-comments", false, "disable printing the comments")
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noQ = flag.Bool("no-question", false, "disable printing the question section")
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noOpt = flag.Bool("no-opt", false, "disable printing the OPT pseudosection")
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noAns = flag.Bool("no-answer", false, "disable printing the answer section")
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noAuth = flag.Bool("no-authority", false, "disable printing the authority section")
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noAdd = flag.Bool("no-additional", false, "disable printing the additional section")
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noStats = flag.Bool("no-statistics", false, "disable printing the statistics section")
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verbosity = flag.Int("verbosity", 1, "sets verbosity `level`", flag.OptShorthand('v'), flag.OptNoOptDefVal("2"))
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versionFlag = flag.Bool("version", false, "print version information", flag.OptShorthand('V'))
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)
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// Don't sort the flags when -h is given
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flag.CommandLine.SortFlags = false
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// Parse the flags
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if err := flag.CommandLine.Parse(os.Args[1:]); err != nil {
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return util.Options{Logger: util.InitLogger(*verbosity)}, fmt.Errorf("flag: %w", err)
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}
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// TODO: DRY, dumb dumb.
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mbz, err := strconv.ParseInt(*mbzflag, 0, 16)
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if err != nil {
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return util.Options{Logger: util.InitLogger(*verbosity)}, fmt.Errorf("EDNS MBZ: %w", err)
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}
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opts := util.Options{
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Logger: util.InitLogger(*verbosity),
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IPv4: *ipv4,
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IPv6: *ipv6,
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Short: *short,
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TCP: *tcp,
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DNSCrypt: *dnscrypt,
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TLS: *tls,
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TLSHost: *tlsHost,
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TLSNoVerify: *noVerify,
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HTTPS: *https,
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QUIC: *quic,
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Truncate: *truncate,
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Reverse: *reverse,
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JSON: *json,
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XML: *xml,
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YAML: *yaml,
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HeaderFlags: util.HeaderFlags{
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AA: *aaflag,
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AD: *adflag,
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TC: *tcflag,
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Z: *zflag,
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CD: *cdflag,
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QR: *qrflag,
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RD: *rdflag,
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RA: *raflag,
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},
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Request: util.Request{
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Type: dns.StringToType[strings.ToUpper(*qType)],
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Class: dns.StringToClass[strings.ToUpper(*class)],
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Name: *query,
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Timeout: time.Duration(*timeout * float32(time.Second)),
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Retries: *retry,
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Port: *port,
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},
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Display: util.Display{
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Comments: !*noC,
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Question: !*noQ,
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Opt: !*noOpt,
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Answer: !*noAns,
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Authority: !*noAuth,
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Additional: !*noAdd,
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Statistics: !*noStats,
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HumanTTL: false,
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ShowQuery: false,
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TTL: true,
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},
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EDNS: util.EDNS{
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EnableEDNS: !*edns,
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Cookie: !*cookie,
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DNSSEC: *dnssec,
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BufSize: *udpBufSize,
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Version: *ednsVer,
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Expire: *expire,
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KeepOpen: *tcpKeepAlive,
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Nsid: *nsid,
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ZFlag: uint16(mbz & 0x7FFF),
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Padding: *padding,
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},
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}
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// TODO: DRY
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if *subnet != "" {
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if err = util.ParseSubnet(*subnet, &opts); err != nil {
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return opts, fmt.Errorf("%w", err)
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}
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}
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opts.Logger.Info("POSIX flags parsed")
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opts.Logger.Debug(fmt.Sprintf("%+v", opts))
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if *versionFlag {
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fmt.Printf("awl version %s, built with %s\n", version, runtime.Version())
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return opts, ErrNotError
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}
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// Parse all the arguments that don't start with - or --
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// This includes the dig-style (+) options
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err = ParseMiscArgs(flag.Args(), &opts)
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if err != nil {
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return opts, err
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}
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opts.Logger.Info("Dig/Drill flags parsed")
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opts.Logger.Debug(fmt.Sprintf("%+v", opts))
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if opts.Request.Port == 0 {
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if opts.TLS || opts.QUIC {
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opts.Request.Port = 853
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} else {
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opts.Request.Port = 53
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}
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}
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opts.Logger.Info("Port set to", opts.Request.Port)
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// Set timeout to 0.5 seconds if set below 0.5
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if opts.Request.Timeout < (time.Second / 2) {
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opts.Request.Timeout = (time.Second / 2)
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}
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if opts.Request.Retries < 0 {
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opts.Request.Retries = 0
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}
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opts.Logger.Info("Options fully populated")
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opts.Logger.Debug(fmt.Sprintf("%+v", opts))
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return opts, nil
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}
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// ErrNotError is for returning not error.
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var ErrNotError = errors.New("not an error")
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var errNoArg = errors.New("no argument given")
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type errInvalidArg struct {
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arg string
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}
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func (e *errInvalidArg) Error() string {
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return fmt.Sprintf("digflags: invalid argument %s", e.arg)
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}
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