45 lines
1.1 KiB
Go
45 lines
1.1 KiB
Go
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package vnet
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import (
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"fmt"
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"net"
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)
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// Deliver directly send packet to vnet or real-server.
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// For example, we can use this API to simulate the REPLAY ATTACK.
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func (v *UDPProxy) Deliver(sourceAddr, destAddr net.Addr, b []byte) (nn int, err error) {
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v.workers.Range(func(key, value interface{}) bool {
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if nn, err = value.(*aUDPProxyWorker).Deliver(sourceAddr, destAddr, b); err != nil {
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return false // Fail, abort.
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} else if nn == len(b) {
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return false // Done.
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}
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return true // Deliver by next worker.
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})
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return
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}
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func (v *aUDPProxyWorker) Deliver(sourceAddr, destAddr net.Addr, b []byte) (nn int, err error) {
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addr, ok := sourceAddr.(*net.UDPAddr)
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if !ok {
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return 0, fmt.Errorf("invalid addr %v", sourceAddr) // nolint:goerr113
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}
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// nolint:godox // TODO: Support deliver packet from real server to vnet.
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// If packet is from vnet, proxy to real server.
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var realSocket *net.UDPConn
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if value, ok := v.endpoints.Load(addr.String()); !ok {
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return 0, nil
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} else { // nolint:golint
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realSocket = value.(*net.UDPConn)
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}
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// Send to real server.
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if _, err := realSocket.Write(b); err != nil {
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return 0, err
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}
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return len(b), nil
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}
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