From 1d80155d5e036a0c10dd456ae2772dfa17338b95 Mon Sep 17 00:00:00 2001 From: Felix Lange Date: Mon, 21 Nov 2016 18:11:21 +0100 Subject: p2p/netutil: new package for network utilities The new package contains three things for now: - IP network list parsing and matching - The WSAEMSGSIZE workaround, which is duplicated in p2p/discover and p2p/discv5. --- p2p/netutil/toobig_windows.go | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) create mode 100644 p2p/netutil/toobig_windows.go (limited to 'p2p/netutil/toobig_windows.go') diff --git a/p2p/netutil/toobig_windows.go b/p2p/netutil/toobig_windows.go new file mode 100644 index 000000000..dfbb6d44f --- /dev/null +++ b/p2p/netutil/toobig_windows.go @@ -0,0 +1,40 @@ +// Copyright 2016 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see . + +//+build windows + +package netutil + +import ( + "net" + "os" + "syscall" +) + +const _WSAEMSGSIZE = syscall.Errno(10040) + +// isPacketTooBig reports whether err indicates that a UDP packet didn't +// fit the receive buffer. On Windows, WSARecvFrom returns +// code WSAEMSGSIZE and no data if this happens. +func isPacketTooBig(err error) bool { + if opErr, ok := err.(*net.OpError); ok { + if scErr, ok := opErr.Err.(*os.SyscallError); ok { + return scErr.Err == _WSAEMSGSIZE + } + return opErr.Err == _WSAEMSGSIZE + } + return false +} -- cgit v1.2.3