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// Package tls provides a Go interface to the libtls library.
package tls
/*
#cgo LDFLAGS: -ltls -lssl -lcrypto
#include <stdlib.h>
#include <tls.h>
typedef void *tls;
*/
import "C"
import (
"errors"
"fmt"
"unsafe"
)
// TLSConfig provides configuration options for a TLS context.
type TLSConfig struct {
caFile *C.char
tlsCfg *C.struct_tls_config
}
// TLS encapsulates the TLS context.
type TLS struct {
cfg *TLSConfig
ctx *C.struct_tls
}
// Init initialises the TLS library.
func Init() error {
if C.tls_init() != 0 {
return errors.New("initialisation failed")
}
return nil
}
// NewConfig returns a new TLS configuration.
func NewConfig() (*TLSConfig, error) {
cfg := C.tls_config_new()
if cfg == nil {
return nil, errors.New("failed to allocate config")
}
return &TLSConfig{
tlsCfg: cfg,
}, nil
}
// SetCAFile sets the CA file to be used for connections.
func (c *TLSConfig) SetCAFile(filename string) {
if c.caFile != nil {
C.free(unsafe.Pointer(c.caFile))
}
c.caFile = C.CString(filename)
C.tls_config_set_ca_file(c.tlsCfg, c.caFile)
}
// InsecureNoVerifyCert disables certificate verification for the connection.
func (c *TLSConfig) InsecureNoVerifyCert() {
C.tls_config_insecure_noverifycert(c.tlsCfg)
}
// InsecureNoVerifyName disables server name verification for the connection.
func (c *TLSConfig) InsecureNoVerifyName() {
C.tls_config_insecure_noverifyname(c.tlsCfg)
}
// SetSecure enables verification for the connection.
func (c *TLSConfig) SetVerify() {
C.tls_config_verify(c.tlsCfg)
}
// Free frees resources associated with the TLS configuration.
func (c *TLSConfig) Free() {
if c.tlsCfg == nil {
return
}
C.tls_config_free(c.tlsCfg)
c.tlsCfg = nil
}
// NewClient returns a new TLS client context, using the optional configuration.
// If no configuration is specified the default configuration will be used.
func NewClient(config *TLSConfig) (*TLS, error) {
var sslCfg *C.struct_tls_config
if config != nil {
sslCfg = config.tlsCfg
}
ctx := C.tls_client()
if ctx == nil {
return nil, errors.New("tls client failed")
}
if C.tls_configure(ctx, sslCfg) != 0 {
return nil, errors.New("tls configure failed")
}
return &TLS{
cfg: config,
ctx: ctx,
}, nil
}
// Error returns the error message from the TLS context.
func (t *TLS) Error() string {
if msg := C.tls_error(t.ctx); msg != nil {
return C.GoString(msg)
}
return ""
}
// Connect attempts to establish an TLS connection to the specified host on
// the given port. The host may optionally contain a colon separated port
// value if the port string is specified as an empty string.
func (t *TLS) Connect(host, port string) error {
h := C.CString(host)
var p *C.char
if port != "" {
p = C.CString(port)
}
defer C.free(unsafe.Pointer(h))
defer C.free(unsafe.Pointer(p))
if C.tls_connect(t.ctx, h, p) != 0 {
return fmt.Errorf("connect failed: %v", t.Error())
}
return nil
}
// Read reads data the TLS connection into the given buffer.
func (t *TLS) Read(buf []byte) (int, error) {
var inlen C.size_t
if C.tls_read(t.ctx, unsafe.Pointer(&buf[0]), C.size_t(len(buf)), (*C.size_t)(unsafe.Pointer(&inlen))) != 0 {
return -1, fmt.Errorf("read failed: %v", t.Error())
}
return int(inlen), nil
}
// Write writes the given data to the TLS connection.
func (t *TLS) Write(buf []byte) (int, error) {
var outlen C.size_t
p := C.CString(string(buf))
defer C.free(unsafe.Pointer(p))
if C.tls_write(t.ctx, unsafe.Pointer(p), C.size_t(len(buf)), (*C.size_t)(unsafe.Pointer(&outlen))) != 0 {
return -1, fmt.Errorf("write failed: %v", t.Error())
}
return int(outlen), nil
}
// Close closes the TLS connection.
func (t *TLS) Close() error {
if C.tls_close(t.ctx) != 0 {
return fmt.Errorf("close failed: %v", t.Error())
}
return nil
}
// Free frees resources associated with the TLS context.
func (t *TLS) Free() {
if t.ctx == nil {
return
}
C.tls_free(t.ctx)
t.ctx = nil
}
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