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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,72 @@ | ||
| package util | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "crypto/rand" | ||
| "encoding/binary" | ||
| "encoding/hex" | ||
| "fmt" | ||
| "io" | ||
| "io/ioutil" | ||
| "os" | ||
|
|
||
| "golang.org/x/sys/windows" | ||
| ) | ||
|
|
||
| // CygwinNonceString converts binary nonce to printable string in net order. | ||
| func CygwinNonceString(nonce [16]byte) string { | ||
| var buf [35]byte | ||
| dst := buf[:] | ||
| for i := 0; i < 4; i++ { | ||
| b := nonce[i*4 : i*4+4] | ||
| hex.Encode(dst[i*9:i*9+8], []byte{b[3], b[2], b[1], b[0]}) | ||
| if i != 3 { | ||
| dst[9*i+8] = '-' | ||
| } | ||
| } | ||
| return string(buf[:]) | ||
| } | ||
|
|
||
| // CygwinCreateSocketFile creates CygWin socket file with proper content and attributes. | ||
| func CygwinCreateSocketFile(fname string, port int) (nonce [16]byte, err error) { | ||
| if _, err = rand.Read(nonce[:]); err != nil { | ||
| return | ||
| } | ||
| if err = ioutil.WriteFile(fname, []byte(fmt.Sprintf("!<socket >%d s %s", port, CygwinNonceString(nonce))), 0600); err != nil { | ||
| return | ||
| } | ||
| var cpath *uint16 | ||
| if cpath, err = windows.UTF16PtrFromString(fname); err != nil { | ||
| return | ||
| } | ||
| err = windows.SetFileAttributes(cpath, windows.FILE_ATTRIBUTE_SYSTEM|windows.FILE_ATTRIBUTE_READONLY) | ||
| return | ||
| } | ||
|
|
||
| // CygwinPerformHandshake exchanges handshake data. | ||
| func CygwinPerformHandshake(conn io.ReadWriter, nonce [16]byte) error { | ||
|
|
||
| var nonceR [16]byte | ||
| if _, err := conn.Read(nonceR[:]); err != nil { | ||
| return err | ||
| } | ||
| if !bytes.Equal(nonce[:], nonceR[:]) { | ||
| return fmt.Errorf("invalid nonce received - expecting %x but got %x", nonce[:], nonceR[:]) | ||
| } | ||
| if _, err := conn.Write(nonce[:]); err != nil { | ||
| return err | ||
| } | ||
|
|
||
| // read client pid:uid:gid | ||
| buf := make([]byte, 12) | ||
| if _, err := conn.Read(buf); err != nil { | ||
| return err | ||
| } | ||
|
|
||
| // Send back our info, making sure that gid:uid are the same as received | ||
| binary.LittleEndian.PutUint32(buf, uint32(os.Getpid())) | ||
| if _, err := conn.Write(buf); err != nil { | ||
| return err | ||
| } | ||
| return nil | ||
| } |
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