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net/netcheck: don't send flood of PCP unmap requests to router

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Updates #810
This commit is contained in:
Brad Fitzpatrick 2020-12-06 19:46:11 -08:00
parent 9503be083d
commit 05e5233e07
1 changed files with 9 additions and 5 deletions
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4
net/netcheck/netcheck.go
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@ -710,6 +710,7 @@ func (rs *reportState) probePortMapServices() {
uc.WriteTo(pcpPacket(myIP, tempPort, false), port5351)
res := make([]byte, 1500)
sentPCPDelete := false
for {
n, addr, err := uc.ReadFrom(res)
if err != nil {
@ -727,6 +728,8 @@ func (rs *reportState) probePortMapServices() {
if n == 60 && res[0] == 0x02 { // right length and version 2
rs.setOptBool(&rs.report.PCP, true)
if !sentPCPDelete {
sentPCPDelete = true
// And now delete the mapping.
// (PCP is the only protocol of the three that requires
// we cause a side effect to detect whether it's present,
@ -736,6 +739,7 @@ func (rs *reportState) probePortMapServices() {
}
}
}
}
var pmpPacket = []byte{0, 0} // version 0, opcode 0 = "Public address request"