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p2p/nat: retry UPnP several times before resetting port to 0

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Signed-off-by: Csaba Kiraly <csaba.kiraly@gmail.com>
This commit is contained in:
Csaba Kiraly 2025-04-03 09:32:16 +02:00
parent fe9056f29f
commit 78930c11fb
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1 changed files with 15 additions and 4 deletions
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19
p2p/server_nat.go
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@ -31,12 +31,14 @@ const (
portMapRefreshInterval = 8 * time.Minute
portMapRetryInterval = 5 * time.Minute
extipRetryInterval = 2 * time.Minute
maxRetries = 5 // max number of failed attempts to refresh the mapping
)
type portMapping struct {
protocol string
name string
port int
retries int // number of failed attempts to refresh the mapping
// for use by the portMappingLoop goroutine:
extPort int // the mapped port returned by the NAT interface
@ -158,17 +160,26 @@ func (srv *Server) portMappingLoop() {
if m.extPort == 0 {
log.Debug("Couldn't add port mapping", "err", err)
} else {
// Since UPnP implementation are often buggy,
// and lifetime is larger than the retry interval, this does not mean we lost our
// existing mapping. We do not reset the external port, as it is still our best chance,
// Failed refresh. Since UPnP implementation are often buggy, and lifetime is
// larger than the retry interval, this does not mean we lost our existing
// mapping. We do not reset the external port, as it is still our best chance,
// but we do retry soon.
// TODO: we could check the error code, but again, UPnP implementations are buggy.
log.Debug("Couldn't refresh port mapping", "err", err)
m.retries++
if m.retries > maxRetries {
m.retries = 0
err := srv.NAT.DeleteMapping(m.protocol, m.extPort, m.port)
log.Debug("Couldn't refresh port mapping, trying to delete it:", "err", err)
m.extPort = 0
}
}
m.nextTime = srv.clock.Now().Add(portMapRetryInterval)
continue
continue //TODO: this means we never reset the ENR. Is that what we want?
}
// It was mapped!
m.retries = 0
log = newLogger(m.protocol, int(p), m.port)
if int(p) != m.extPort {
m.extPort = int(p)