mirror of
https://github.com/miekg/dns.git
synced 2025-08-18 07:26:58 +02:00
88 lines
2.4 KiB
Go
88 lines
2.4 KiB
Go
package main
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import (
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"dns"
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)
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// Check if the server responds at all
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func dnsAlive(l *lexer) stateFn {
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l.verbose("Alive")
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l.setString("QUERY,NOERROR,qr,aa,tc,rd,ra,ad,cd,z,1,0,0,0,do,0")
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l.setQuestion(".", dns.TypeNS, dns.ClassINET)
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f := l.probe()
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if f.ok() {
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return dnsDoBitMirror
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}
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l.emit(&item{itemError, f.error()})
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return nil
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}
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// Check if the server returns the DO-bit when set in the request.
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func dnsDoBitMirror(l *lexer) stateFn {
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l.verbose("DoBitMirror")
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l.setString("QUERY,NOERROR,qr,aa,tc,RD,ra,ad,cd,z,1,0,0,0,DO,0")
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l.setQuestion(".", dns.TypeNS, dns.ClassINET)
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f := l.probe()
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// NSD doesn't set the DO bit, but does set the UDPMsg size to 4096.
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if !f.Do && f.UDPSize == 4096 {
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l.emit(&item{itemSoftware, NSD})
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return dnsEDNS0Mangler
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}
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return dnsEDNS0Mangler
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}
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func dnsEDNS0Mangler(l *lexer) stateFn {
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l.verbose("EDNS0Mangler")
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l.setString("NOTIFY,NOERROR,qr,aa,tc,RD,ra,ad,cd,z,1,0,0,0,do,0")
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l.setQuestion("012345678901234567890123456789012345678901234567890123456789012.012345678901234567890123456789012345678901234567890123456789012.012345678901234567890123456789012345678901234567890123456789012.0123456789012345678901234567890123456789012345678901234567890.", dns.TypeA, dns.ClassINET)
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f := l.probe()
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// MaraDNS does not set the QR bit in the reply... but only with this question is seems
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// QUERY,NOERROR,qr,aa,t
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if !f.Response && f.Opcode == dns.OpcodeQuery && f.Rcode == dns.RcodeSuccess {
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l.emit(&item{itemSoftware, MARADNS})
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}
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return dnsTcEnable
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}
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func dnsTcEnable(l *lexer) stateFn {
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l.verbose("TcEnable")
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l.setString("QUERY,NOERROR,qr,aa,TC,rd,ra,ad,cd,z,1,0,0,0,do,0")
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l.setQuestion(".", dns.TypeNS, dns.ClassINET)
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f := l.probe()
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f = f
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return dnsUDPSize
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}
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func dnsUDPSize(l *lexer) stateFn {
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l.verbose("UDPSize")
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l.setString("QUERY,NOERROR,qr,aa,tc,rd,ra,ad,cd,z,1,0,0,0,DO,4097")
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l.setQuestion(".", dns.TypeNS, dns.ClassINET)
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f := l.probe()
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f = f
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return dnsZero
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}
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func dnsZero(l *lexer) stateFn {
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l.verbose("Zero")
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l.setQuestion(".", dns.TypeNS, dns.ClassINET)
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l.setString("QUERY,NOERROR,qr,aa,tc,rd,ra,ad,cd,Z,1,0,0,0,do,0")
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f := l.probe()
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f = f
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return dnsAll
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}
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func dnsAll(l *lexer) stateFn {
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l.verbose("All")
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l.setString("NOTIFY,NOERROR,qr,AA,TC,RD,RA,AD,CD,Z,1,0,0,0,DO,0")
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l.setQuestion(".", dns.TypeNS, dns.ClassINET)
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f := l.probe()
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f = f
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return nil
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}
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