mirror of https://github.com/slackhq/nebula.git
51 lines
995 B
Go
51 lines
995 B
Go
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package nebula
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import "unsafe"
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type iovec struct {
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Base *byte
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Len uint64
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}
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type msghdr struct {
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Name *byte
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Namelen uint32
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Pad0 [4]byte
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Iov *iovec
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Iovlen uint64
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Control *byte
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Controllen uint64
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Flags int32
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Pad1 [4]byte
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}
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type rawMessage struct {
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Hdr msghdr
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Len uint32
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Pad0 [4]byte
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}
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func (u *udpConn) PrepareRawMessages(n int) ([]rawMessage, [][]byte, [][]byte) {
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msgs := make([]rawMessage, n)
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buffers := make([][]byte, n)
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names := make([][]byte, n)
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for i := range msgs {
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buffers[i] = make([]byte, mtu)
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names[i] = make([]byte, 0x1c) //TODO = sizeofSockaddrInet6
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//TODO: this is still silly, no need for an array
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vs := []iovec{
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{Base: (*byte)(unsafe.Pointer(&buffers[i][0])), Len: uint64(len(buffers[i]))},
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}
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msgs[i].Hdr.Iov = &vs[0]
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msgs[i].Hdr.Iovlen = uint64(len(vs))
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msgs[i].Hdr.Name = (*byte)(unsafe.Pointer(&names[i][0]))
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msgs[i].Hdr.Namelen = uint32(len(names[i]))
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}
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return msgs, buffers, names
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}
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