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package utils
import (
"io"
"strings"
"github.com/ansible/receptor/pkg/logger"
)
// NormalBufferSize is the size of buffers used by various processes when copying data between sockets.
const NormalBufferSize = 65536
// BridgeConns bridges two connections, like netcat.
func BridgeConns(c1 io.ReadWriteCloser, c1Name string, c2 io.ReadWriteCloser, c2Name string, logger *logger.ReceptorLogger) {
doneChan := make(chan bool)
go bridgeHalf(c1, c1Name, c2, c2Name, doneChan, logger)
go bridgeHalf(c2, c2Name, c1, c1Name, doneChan, logger)
<-doneChan
<-doneChan
}
// BridgeHalf bridges the read side of c1 to the write side of c2.
func bridgeHalf(c1 io.ReadWriteCloser, c1Name string, c2 io.ReadWriteCloser, c2Name string, done chan bool, logger *logger.ReceptorLogger) {
logger.Trace(" Bridging %s to %s\n", c1Name, c2Name)
defer func() {
done <- true
}()
buf := make([]byte, NormalBufferSize)
shouldClose := false
for {
n, err := c1.Read(buf)
if err != nil {
if err.Error() != "EOF" && !strings.Contains(err.Error(), "use of closed network connection") {
logger.Error("Connection read error: %s\n", err)
}
shouldClose = true
}
if n > 0 {
logger.Trace(" Copied %d bytes from %s to %s\n", n, c1Name, c2Name)
wn, err := c2.Write(buf[:n])
if err != nil {
logger.Error("Connection write error: %s\n", err)
shouldClose = true
}
if wn != n {
logger.Error("Not all bytes written\n")
shouldClose = true
}
}
if shouldClose {
logger.Trace(" Stopping bridge %s to %s\n", c1Name, c2Name)
_ = c2.Close()
return
}
}
}
|
