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2871781f64
On Windows, UDPConn.ReadFrom returns an error for packets larger than the receive buffer. The error is not marked temporary, causing our loop to exit when the first oversized packet arrived. The fix is to treat this particular error as temporary. Fixes: #1579, #2087 Updates: #2082
41 lines
1.3 KiB
Go
41 lines
1.3 KiB
Go
// Copyright 2016 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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//+build windows
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package discover
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import (
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"net"
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"os"
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"syscall"
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)
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const _WSAEMSGSIZE = syscall.Errno(10040)
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// reports whether err indicates that a UDP packet didn't
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// fit the receive buffer. On Windows, WSARecvFrom returns
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// code WSAEMSGSIZE and no data if this happens.
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func isPacketTooBig(err error) bool {
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if opErr, ok := err.(*net.OpError); ok {
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if scErr, ok := opErr.Err.(*os.SyscallError); ok {
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return scErr.Err == _WSAEMSGSIZE
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}
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return opErr.Err == _WSAEMSGSIZE
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}
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return false
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}
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