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//go:build darwin
// +build darwin
package transport
import (
"bytes"
"encoding/hex"
"fmt"
"net"
"syscall"
)
type connectedUnixgramConn struct {
*net.UnixConn
remoteAddr *net.UnixAddr
}
func connectListeningUnixgramConn(conn *net.UnixConn, remoteAddr *net.UnixAddr) (*connectedUnixgramConn, error) {
rawConn, err := conn.SyscallConn()
if err != nil {
return nil, err
}
err = rawConn.Control(func(fd uintptr) {
if err = syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_SNDBUF, 1*1024*1024); err != nil {
return
}
if err = syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_RCVBUF, 4*1024*1024); err != nil {
return
}
})
if err != nil {
return nil, err
}
return &connectedUnixgramConn{
UnixConn: conn,
remoteAddr: remoteAddr,
}, nil
}
func (conn *connectedUnixgramConn) RemoteAddr() net.Addr {
return conn.remoteAddr
}
func (conn *connectedUnixgramConn) Write(b []byte) (int, error) {
return conn.WriteTo(b, conn.remoteAddr)
}
func AcceptVfkit(listeningConn *net.UnixConn) (net.Conn, error) {
vfkitMagic := make([]byte, 4)
// the main reason for this magic check is to get the address to use to send data to the vfkit VM
bytesRead, vfkitAddr, err := listeningConn.ReadFrom(vfkitMagic)
if bytesRead != len(vfkitMagic) {
return nil, fmt.Errorf("invalid magic length: %d", len(vfkitMagic))
}
if err != nil {
return nil, err
}
if _, ok := vfkitAddr.(*net.UnixAddr); !ok {
return nil, fmt.Errorf("unexpected type for vfkit unix sockaddr: %t", vfkitAddr)
}
if !bytes.Equal(vfkitMagic, []byte("VFKT")) {
return nil, fmt.Errorf("invalid magic from the vfkit process: %s", hex.EncodeToString(vfkitMagic))
}
return connectListeningUnixgramConn(listeningConn, vfkitAddr.(*net.UnixAddr))
}
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