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// Copyright (C) 2017. See AUTHORS.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package openssl
// #include "shim.h"
import "C"
import (
"errors"
"io"
"reflect"
"sync"
"unsafe"
)
const (
SSLRecordSize = 16 * 1024
)
func nonCopyGoBytes(ptr uintptr, length int) []byte {
var slice []byte
header := (*reflect.SliceHeader)(unsafe.Pointer(&slice))
header.Cap = length
header.Len = length
header.Data = ptr
return slice
}
func nonCopyCString(data *C.char, size C.int) []byte {
return nonCopyGoBytes(uintptr(unsafe.Pointer(data)), int(size))
}
var writeBioMapping = newMapping()
type writeBio struct {
data_mtx sync.Mutex
op_mtx sync.Mutex
buf []byte
release_buffers bool
}
func loadWritePtr(b *C.BIO) *writeBio {
t := token(C.X_BIO_get_data(b))
return (*writeBio)(writeBioMapping.Get(t))
}
func bioClearRetryFlags(b *C.BIO) {
C.X_BIO_clear_flags(b, C.BIO_FLAGS_RWS|C.BIO_FLAGS_SHOULD_RETRY)
}
func bioSetRetryRead(b *C.BIO) {
C.X_BIO_set_flags(b, C.BIO_FLAGS_READ|C.BIO_FLAGS_SHOULD_RETRY)
}
//export go_write_bio_write
func go_write_bio_write(b *C.BIO, data *C.char, size C.int) (rc C.int) {
defer func() {
if err := recover(); err != nil {
logger.Critf("openssl: writeBioWrite panic'd: %v", err)
rc = -1
}
}()
ptr := loadWritePtr(b)
if ptr == nil || data == nil || size < 0 {
return -1
}
ptr.data_mtx.Lock()
defer ptr.data_mtx.Unlock()
bioClearRetryFlags(b)
ptr.buf = append(ptr.buf, nonCopyCString(data, size)...)
return size
}
//export go_write_bio_ctrl
func go_write_bio_ctrl(b *C.BIO, cmd C.int, arg1 C.long, arg2 unsafe.Pointer) (
rc C.long) {
defer func() {
if err := recover(); err != nil {
logger.Critf("openssl: writeBioCtrl panic'd: %v", err)
rc = -1
}
}()
switch cmd {
case C.BIO_CTRL_WPENDING:
return writeBioPending(b)
case C.BIO_CTRL_DUP, C.BIO_CTRL_FLUSH:
return 1
default:
return 0
}
}
func writeBioPending(b *C.BIO) C.long {
ptr := loadWritePtr(b)
if ptr == nil {
return 0
}
ptr.data_mtx.Lock()
defer ptr.data_mtx.Unlock()
return C.long(len(ptr.buf))
}
func (b *writeBio) WriteTo(w io.Writer) (rv int64, err error) {
b.op_mtx.Lock()
defer b.op_mtx.Unlock()
// write whatever data we currently have
b.data_mtx.Lock()
data := b.buf
b.data_mtx.Unlock()
if len(data) == 0 {
return 0, nil
}
n, err := w.Write(data)
// subtract however much data we wrote from the buffer
b.data_mtx.Lock()
b.buf = b.buf[:copy(b.buf, b.buf[n:])]
if b.release_buffers && len(b.buf) == 0 {
b.buf = nil
}
b.data_mtx.Unlock()
return int64(n), err
}
func (self *writeBio) Disconnect(b *C.BIO) {
if loadWritePtr(b) == self {
writeBioMapping.Del(token(C.X_BIO_get_data(b)))
C.X_BIO_set_data(b, nil)
}
}
func (b *writeBio) MakeCBIO() *C.BIO {
rv := C.X_BIO_new_write_bio()
token := writeBioMapping.Add(unsafe.Pointer(b))
C.X_BIO_set_data(rv, unsafe.Pointer(token))
return rv
}
var readBioMapping = newMapping()
type readBio struct {
data_mtx sync.Mutex
op_mtx sync.Mutex
buf []byte
eof bool
release_buffers bool
}
func loadReadPtr(b *C.BIO) *readBio {
return (*readBio)(readBioMapping.Get(token(C.X_BIO_get_data(b))))
}
//export go_read_bio_read
func go_read_bio_read(b *C.BIO, data *C.char, size C.int) (rc C.int) {
defer func() {
if err := recover(); err != nil {
logger.Critf("openssl: go_read_bio_read panic'd: %v", err)
rc = -1
}
}()
ptr := loadReadPtr(b)
if ptr == nil || size < 0 {
return -1
}
ptr.data_mtx.Lock()
defer ptr.data_mtx.Unlock()
bioClearRetryFlags(b)
if len(ptr.buf) == 0 {
if ptr.eof {
return 0
}
bioSetRetryRead(b)
return -1
}
if size == 0 || data == nil {
return C.int(len(ptr.buf))
}
n := copy(nonCopyCString(data, size), ptr.buf)
ptr.buf = ptr.buf[:copy(ptr.buf, ptr.buf[n:])]
if ptr.release_buffers && len(ptr.buf) == 0 {
ptr.buf = nil
}
return C.int(n)
}
//export go_read_bio_ctrl
func go_read_bio_ctrl(b *C.BIO, cmd C.int, arg1 C.long, arg2 unsafe.Pointer) (
rc C.long) {
defer func() {
if err := recover(); err != nil {
logger.Critf("openssl: readBioCtrl panic'd: %v", err)
rc = -1
}
}()
switch cmd {
case C.BIO_CTRL_PENDING:
return readBioPending(b)
case C.BIO_CTRL_DUP, C.BIO_CTRL_FLUSH:
return 1
default:
return 0
}
}
func readBioPending(b *C.BIO) C.long {
ptr := loadReadPtr(b)
if ptr == nil {
return 0
}
ptr.data_mtx.Lock()
defer ptr.data_mtx.Unlock()
return C.long(len(ptr.buf))
}
func (b *readBio) ReadFromOnce(r io.Reader) (n int, err error) {
b.op_mtx.Lock()
defer b.op_mtx.Unlock()
// make sure we have a destination that fits at least one SSL record
b.data_mtx.Lock()
if cap(b.buf) < len(b.buf)+SSLRecordSize {
new_buf := make([]byte, len(b.buf), len(b.buf)+SSLRecordSize)
copy(new_buf, b.buf)
b.buf = new_buf
}
dst := b.buf[len(b.buf):cap(b.buf)]
dst_slice := b.buf
b.data_mtx.Unlock()
n, err = r.Read(dst)
b.data_mtx.Lock()
defer b.data_mtx.Unlock()
if n > 0 {
if len(dst_slice) != len(b.buf) {
// someone shrunk the buffer, so we read in too far ahead and we
// need to slide backwards
copy(b.buf[len(b.buf):len(b.buf)+n], dst)
}
b.buf = b.buf[:len(b.buf)+n]
}
return n, err
}
func (b *readBio) MakeCBIO() *C.BIO {
rv := C.X_BIO_new_read_bio()
token := readBioMapping.Add(unsafe.Pointer(b))
C.X_BIO_set_data(rv, unsafe.Pointer(token))
return rv
}
func (self *readBio) Disconnect(b *C.BIO) {
if loadReadPtr(b) == self {
readBioMapping.Del(token(C.X_BIO_get_data(b)))
C.X_BIO_set_data(b, nil)
}
}
func (b *readBio) MarkEOF() {
b.data_mtx.Lock()
defer b.data_mtx.Unlock()
b.eof = true
}
type anyBio C.BIO
func asAnyBio(b *C.BIO) *anyBio { return (*anyBio)(b) }
func (b *anyBio) Read(buf []byte) (n int, err error) {
if len(buf) == 0 {
return 0, nil
}
n = int(C.X_BIO_read((*C.BIO)(b), unsafe.Pointer(&buf[0]), C.int(len(buf))))
if n <= 0 {
return 0, io.EOF
}
return n, nil
}
func (b *anyBio) Write(buf []byte) (written int, err error) {
if len(buf) == 0 {
return 0, nil
}
n := int(C.X_BIO_write((*C.BIO)(b), unsafe.Pointer(&buf[0]),
C.int(len(buf))))
if n != len(buf) {
return n, errors.New("BIO write failed")
}
return n, nil
}
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