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package netutil
import (
"io"
"log"
"net"
"sync"
"time"
)
// ProxyTCP proxies between two TCP connections.
// Because TLS connections don't have CloseRead() and CloseWrite() methods, our
// temporary solution is to use timeouts.
func ProxyTCP(conn1, conn2 net.Conn, tlsWriteDeadline, tlsReadDeadline time.Duration) {
var wg sync.WaitGroup
wg.Add(2)
go copyBytes(conn1, conn2, &wg, tlsWriteDeadline, tlsReadDeadline)
go copyBytes(conn2, conn1, &wg, tlsWriteDeadline, tlsReadDeadline)
wg.Wait()
conn1.Close()
conn2.Close()
}
func copyBytes(dst, src net.Conn, wg *sync.WaitGroup, writeDeadline, readDeadline time.Duration) {
defer wg.Done()
_, err := io.Copy(dst, src)
if err != nil {
log.Printf("proxy i/o error: %v", err)
}
if cr, ok := src.(*net.TCPConn); ok {
cr.CloseRead()
} else {
// For TLS connections.
wto := time.Now().Add(writeDeadline)
src.SetWriteDeadline(wto)
}
if cw, ok := dst.(*net.TCPConn); ok {
cw.CloseWrite()
} else {
// For TLS connections.
rto := time.Now().Add(readDeadline)
dst.SetReadDeadline(rto)
}
}
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