145 lines
3.1 KiB
Go
145 lines
3.1 KiB
Go
// SPDX-License-Identifier: BSD-3-Clause
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package query
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import (
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"fmt"
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"strconv"
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"git.froth.zone/sam/awl/util"
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"github.com/dchest/uniuri"
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"github.com/miekg/dns"
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)
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const (
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tcp = "tcp"
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udp = "udp"
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)
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// CreateQuery creates a DNS query from the options given.
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// It sets query flags and EDNS flags from the respective options.
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func CreateQuery(opts util.Options) (util.Response, error) {
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req := new(dns.Msg)
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req.SetQuestion(opts.Request.Name, opts.Request.Type)
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req.Question[0].Qclass = opts.Request.Class
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// Set standard flags
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req.MsgHdr.Response = opts.QR
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req.MsgHdr.Authoritative = opts.AA
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req.MsgHdr.Truncated = opts.TC
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req.MsgHdr.RecursionDesired = opts.RD
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req.MsgHdr.RecursionAvailable = opts.RA
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req.MsgHdr.Zero = opts.Z
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req.MsgHdr.AuthenticatedData = opts.AD
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req.MsgHdr.CheckingDisabled = opts.CD
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// EDNS time :)
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if opts.EDNS.EnableEDNS {
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o := new(dns.OPT)
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o.Hdr.Name = "."
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o.Hdr.Rrtype = dns.TypeOPT
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o.SetVersion(opts.EDNS.Version)
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if opts.EDNS.Cookie {
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e := new(dns.EDNS0_COOKIE)
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e.Code = dns.EDNS0COOKIE
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e.Cookie = uniuri.NewLenChars(8, []byte("1234567890abcdef"))
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o.Option = append(o.Option, e)
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opts.Logger.Info("Setting EDNS cookie to", e.Cookie)
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}
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if opts.EDNS.Expire {
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o.Option = append(o.Option, new(dns.EDNS0_EXPIRE))
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opts.Logger.Info("Setting EDNS Expire option")
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}
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if opts.EDNS.KeepOpen {
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o.Option = append(o.Option, new(dns.EDNS0_TCP_KEEPALIVE))
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opts.Logger.Info("Setting EDNS TCP Keepalive option")
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}
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if opts.EDNS.Nsid {
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o.Option = append(o.Option, new(dns.EDNS0_NSID))
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opts.Logger.Info("Setting EDNS NSID option")
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}
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if opts.EDNS.Padding {
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o.Option = append(o.Option, new(dns.EDNS0_PADDING))
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opts.Logger.Info("Setting EDNS padding")
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}
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o.SetUDPSize(opts.BufSize)
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opts.Logger.Info("EDNS UDP buffer set to", opts.BufSize)
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o.SetZ(opts.EDNS.ZFlag)
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opts.Logger.Info("EDNS Z flag set to", opts.EDNS.ZFlag)
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if opts.EDNS.DNSSEC {
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o.SetDo()
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opts.Logger.Info("EDNS DNSSEC OK set")
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}
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if opts.EDNS.Subnet.Address != nil {
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o.Option = append(o.Option, &opts.EDNS.Subnet)
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}
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req.Extra = append(req.Extra, o)
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} else if opts.EDNS.DNSSEC {
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req.SetEdns0(1232, true)
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opts.Logger.Warn("DNSSEC implies EDNS, EDNS enabled")
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opts.Logger.Info("DNSSEC enabled, UDP buffer set to 1232")
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}
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opts.Logger.Debug(req)
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if !opts.Short {
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if opts.ShowQuery {
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opts.Logger.Info("Printing constructed query")
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var (
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str string
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err error
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)
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if opts.JSON || opts.XML || opts.YAML {
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str, err = PrintSpecial(req, opts)
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if err != nil {
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return util.Response{}, err
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}
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} else {
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temp := opts.Display.Statistics
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opts.Display.Statistics = false
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str = ToString(util.Response{
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DNS: req,
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RTT: 0,
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}, opts)
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opts.Display.Statistics = temp
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str += "\n;; QUERY SIZE: " + strconv.Itoa(req.Len()) + "\n"
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}
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fmt.Println(str)
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opts.ShowQuery = false
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}
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}
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resolver, err := LoadResolver(opts)
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if err != nil {
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return util.Response{}, err
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}
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opts.Logger.Info("Query successfully loaded")
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//nolint:wrapcheck // Error wrapping not needed here
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return resolver.LookUp(req)
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}
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