Mirrors/coredns
1
0
Fork 0
mirror of https://github.com/coredns/coredns.git synced 2026-10-09 12:05:22 -04:00
Code Issues Packages Projects Releases Wiki Activity

plugin/pkg/proxyproto: preserve the UDP peer for LOCAL (#8581)

Browse Source 
This PR consumes LOCAL headers without replacing or caching the actual UDP peer address.

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
This commit is contained in:
Yong Tang
2026-09-29 01:19:37 -07:00
committed by GitHub
parent d821a74af8
commit 23ba070a81
2 changed files with 52 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

26
plugin/pkg/proxyproto/proxyproto.go
View File

@@ -130,21 +130,23 @@ func (c *PacketConn) readFrom(p []byte, addr net.Addr) (_ int, _ net.Addr, err e
fallthrough
case proxyproto.USE:
if header != nil {
addr = &Addr{u: addr, r: header.SourceAddr}
if !header.Command.IsLocal() {
addr = &Addr{u: addr, r: header.SourceAddr}
if c.UDPSessionTrackingTTL > 0 {
// Cache the real source address for subsequent headerless datagrams.
// Spectrum sends the header in a standalone datagram with no DNS
// payload; refresh or insert the entry either way so that the TTL
// resets on every header packet.
c.storeSession(addr.(*Addr).u, header)
if len(payload) == 0 {
// Header-only datagram: no DNS payload to return; loop back
// to read the next datagram.
return 0, nil, errHeaderOnly
if c.UDPSessionTrackingTTL > 0 {
// Cache the real source address for subsequent headerless datagrams.
// Spectrum sends the header in a standalone datagram with no DNS
// payload; refresh or insert the entry either way so that the TTL
// resets on every header packet.
c.storeSession(addr.(*Addr).u, header)
}
}
if c.UDPSessionTrackingTTL > 0 && len(payload) == 0 {
// Header-only datagram: no DNS payload to return; loop back
// to read the next datagram.
return 0, nil, errHeaderOnly
}
} else if c.UDPSessionTrackingTTL > 0 {
// No header present – look for a cached header for this remote.
if cachedHeader, ok := c.lookupSession(addr); ok {