54 lines
1.2 KiB
Go
54 lines
1.2 KiB
Go
package peer
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import (
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"golang.org/x/crypto/nacl/sign"
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)
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func createLocalDiscoveryPacket(localIP byte, signingKey []byte) []byte {
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h := header{
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SourceIP: localIP,
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DestIP: 255,
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}
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buf := make([]byte, headerSize)
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h.Marshal(buf)
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out := make([]byte, headerSize+signOverhead)
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return sign.Sign(out[:0], buf, (*[64]byte)(signingKey))
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}
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func headerFromLocalDiscoveryPacket(pkt []byte) (h header, ok bool) {
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if len(pkt) != headerSize+signOverhead {
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return
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}
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h.Parse(pkt[signOverhead:])
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ok = true
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return
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}
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func verifyLocalDiscoveryPacket(pkt, buf []byte, pubSignKey []byte) bool {
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_, ok := sign.Open(buf[:0], pkt, (*[32]byte)(pubSignKey))
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return ok
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}
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// ----------------------------------------------------------------------------
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/*
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type mcWriter struct {
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conn mcUDPWriter
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discoveryPacket []byte
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}
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func newMCWriter(conn mcUDPWriter, localIP byte, signingKey []byte) *mcWriter {
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return &mcWriter{
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conn: conn,
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discoveryPacket: createLocalDiscoveryPacket(localIP, signingKey),
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}
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}
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func (w *mcWriter) SendLocalDiscovery() {
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if _, err := w.conn.WriteToUDP(w.discoveryPacket, multicastAddr); err != nil {
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log.Printf("[MCWriter] Failed to write multicast UDP packet: %v", err)
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}
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}*/
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