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feat: use dns question flipping trick to reduce dns pollution

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This commit is contained in:
mzz2017
2023-02-04 17:11:01 +08:00
parent e42730ed81
commit 53872a24a5
3 changed files with 43 additions and 7 deletions
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11
component/control/udp.go
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@ -15,6 +15,7 @@ import (
"golang.org/x/net/dns/dnsmessage"
"net"
"net/netip"
"strings"
"time"
)
@ -122,7 +123,7 @@ func (c *ControlPlane) handlePkt(data []byte, lConn *net.UDPConn, lAddrPort neti
if c.log.IsLevelEnabled(logrus.DebugLevel) && len(dnsMessage.Questions) > 0 {
q := dnsMessage.Questions[0]
c.log.Tracef("UDP(DNS) %v <-[%v]-> Cache: %v %v",
RefineSourceToShow(lAddrPort, dest.Addr()), outbound.Name, q.Name, q.Type,
RefineSourceToShow(lAddrPort, dest.Addr()), outbound.Name, strings.ToLower(q.Name.String()), q.Type,
)
}
return nil
@ -132,6 +133,12 @@ func (c *ControlPlane) handlePkt(data []byte, lConn *net.UDPConn, lAddrPort neti
// NOTICE: Routing was calculated in advance by the eBPF program.
dummyFrom = &addrHdr.Dest
dest = c.dnsUpstream
// Flip dns question to reduce dns pollution.
FlipDnsQuestionCase(dnsMessage)
if data, err = dnsMessage.Pack(); err != nil {
return fmt.Errorf("pack flipped dns packet: %w", err)
}
}
}
@ -159,7 +166,7 @@ func (c *ControlPlane) handlePkt(data []byte, lConn *net.UDPConn, lAddrPort neti
"l4proto": "UDP(DNS)",
"outbound": outbound.Name,
"dialer": d.Name(),
"qname": q.Name,
"qname": strings.ToLower(q.Name.String()),
"qtype": q.Type,
}).Infof("%v <-> %v",
RefineSourceToShow(lAddrPort, dest.Addr()), RefineAddrPortToShow(dest),