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net/{neterror,dns/resolver}: move PacketWasTruncated to neterror from DNS code

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And delete the unused code in net/dns/resolver/neterr_*.go.

Change-Id: Ibe62c486bacce2733eb9968c96a98cbbdb2758bd
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2022-01-03 10:49:56 -08:00
committed by Brad Fitzpatrick
parent dd45bba76b
commit 2513d2d728
6 changed files with 37 additions and 90 deletions
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18
net/neterror/neterror.go
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@@ -40,3 +40,21 @@ func TreatAsLostUDP(err error) bool {
}
return false
}
var packetWasTruncated func(error) bool // non-nil on Windows at least
// PacketWasTruncated reports whether err indicates truncation but the RecvFrom
// that generated err was otherwise successful. On Windows, Go's UDP RecvFrom
// calls WSARecvFrom which returns the WSAEMSGSIZE error code when the received
// datagram is larger than the provided buffer. When that happens, both a valid
// size and an error are returned (as per the partial fix for golang/go#14074).
// If the WSAEMSGSIZE error is returned, then we ignore the error to get
// semantics similar to the POSIX operating systems. One caveat is that it
// appears that the source address is not returned when WSAEMSGSIZE occurs, but
// we do not currently look at the source address.
func PacketWasTruncated(err error) bool {
if packetWasTruncated == nil {
return false
}
return packetWasTruncated(err)
}