mirror of
https://github.com/Oxalide/vsphere-influxdb-go.git
synced 2023-10-10 13:36:51 +02:00
68 lines
1.9 KiB
Go
68 lines
1.9 KiB
Go
// Copyright 2017 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build go1.9
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// +build !nacl,!plan9,!windows
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package ipv4
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import (
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"net"
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"golang.org/x/net/internal/socket"
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)
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func (c *payloadHandler) readFrom(b []byte) (int, *ControlMessage, net.Addr, error) {
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c.rawOpt.RLock()
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m := socket.Message{
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OOB: NewControlMessage(c.rawOpt.cflags),
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}
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c.rawOpt.RUnlock()
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switch c.PacketConn.(type) {
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case *net.UDPConn:
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m.Buffers = [][]byte{b}
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if err := c.RecvMsg(&m, 0); err != nil {
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return 0, nil, nil, &net.OpError{Op: "read", Net: c.PacketConn.LocalAddr().Network(), Source: c.PacketConn.LocalAddr(), Err: err}
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}
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case *net.IPConn:
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h := make([]byte, HeaderLen)
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m.Buffers = [][]byte{h, b}
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if err := c.RecvMsg(&m, 0); err != nil {
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return 0, nil, nil, &net.OpError{Op: "read", Net: c.PacketConn.LocalAddr().Network(), Source: c.PacketConn.LocalAddr(), Err: err}
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}
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hdrlen := int(h[0]&0x0f) << 2
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if hdrlen > len(h) {
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d := hdrlen - len(h)
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copy(b, b[d:])
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m.N -= d
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} else {
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m.N -= hdrlen
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}
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default:
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return 0, nil, nil, &net.OpError{Op: "read", Net: c.PacketConn.LocalAddr().Network(), Source: c.PacketConn.LocalAddr(), Err: errInvalidConnType}
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}
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var cm *ControlMessage
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if m.NN > 0 {
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cm = new(ControlMessage)
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if err := cm.Parse(m.OOB[:m.NN]); err != nil {
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return 0, nil, nil, &net.OpError{Op: "read", Net: c.PacketConn.LocalAddr().Network(), Source: c.PacketConn.LocalAddr(), Err: err}
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}
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cm.Src = netAddrToIP4(m.Addr)
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}
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return m.N, cm, m.Addr, nil
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}
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func (c *payloadHandler) writeTo(b []byte, cm *ControlMessage, dst net.Addr) (int, error) {
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m := socket.Message{
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Buffers: [][]byte{b},
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OOB: cm.Marshal(),
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Addr: dst,
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}
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err := c.SendMsg(&m, 0)
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if err != nil {
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err = &net.OpError{Op: "write", Net: c.PacketConn.LocalAddr().Network(), Source: c.PacketConn.LocalAddr(), Addr: opAddr(dst), Err: err}
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}
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return m.N, err
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}
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