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errorkind.go
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errorkind.go
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/*
* Copyright 2018-2021, CS Systemes d'Information, http://csgroup.eu
*
* 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 sshtunnel
import (
"errors"
"net"
"os"
"reflect"
"strings"
"syscall"
"golang.org/x/crypto/ssh"
)
func lastUnwrap(in error) (err error) {
if in == nil {
return nil
}
last := in
for {
err = last
u, ok := last.(interface {
Unwrap() error
})
if !ok {
break
}
last = u.Unwrap()
}
return err
}
func convertErrorToTunnelError(inErr error) (err error) {
if inErr == nil {
return inErr
}
if _, ok := inErr.(tunnelError); ok {
return inErr
}
if isIOTimeout(inErr) {
return tunnelError{
error: inErr,
isTimeout: true,
isTemporary: true,
}
}
if isHandshakeError(inErr) {
return tunnelError{
error: inErr,
isTimeout: false,
isTemporary: true,
}
}
if isConnectionResetByPeer(inErr) {
return tunnelError{
error: nil,
isTimeout: false,
isTemporary: true,
}
}
if isErrorAddressAlreadyInUse(inErr) {
return tunnelError{
error: inErr,
isTimeout: false,
isTemporary: true,
}
}
if isConnectionRefused(inErr) || isConnectionRefusedError(inErr) {
return tunnelError{
error: inErr,
isTimeout: false,
isTemporary: true,
}
}
if isNativeSSHLibError(inErr) {
return tunnelError{
error: inErr,
isTimeout: false,
isTemporary: false,
}
}
if isHostNotFoundError(inErr) {
return tunnelError{
error: inErr,
isTimeout: false,
isTemporary: false,
}
}
if _, ok := inErr.(*net.OpError); ok {
return tunnelError{
error: inErr,
isTimeout: false,
isTemporary: false,
}
}
return inErr
}
func isHostNotFoundError(err error) bool {
if err == nil {
return false
}
err = lastUnwrap(err)
if !isNativeSSHLibError(err) {
return false
}
var sshErr *ssh.OpenChannelError
if ok := errors.As(err, &sshErr); ok {
if sshErr.Reason != 2 {
return false
}
if strings.Contains(sshErr.Message, "route") {
return true
}
}
return false
}
func isConnectionRefusedError(err error) bool {
if err == nil {
return false
}
err = lastUnwrap(err)
if !isNativeSSHLibError(err) {
return false
}
var sshErr *ssh.OpenChannelError
if ok := errors.As(err, &sshErr); ok {
if sshErr.Reason != 2 {
return false
}
if strings.Contains(sshErr.Message, "refused") {
return true
}
}
return false
}
func isNativeSSHLibError(err error) bool {
if err == nil {
return false
}
err = lastUnwrap(err)
if _, ok := err.(*ssh.OpenChannelError); ok {
return true
}
if _, ok := err.(*ssh.PassphraseMissingError); ok {
return true
}
if _, ok := err.(*ssh.ServerAuthError); ok {
return true
}
if _, ok := err.(*ssh.ExitMissingError); ok {
return true
}
if _, ok := err.(*ssh.ExitError); ok {
return true
}
return false
}
func isConnectionRefused(err error) bool {
if err == nil {
return false
}
err = lastUnwrap(err)
if netOp, ok := err.(*net.OpError); ok {
if strings.Contains(netOp.Err.Error(), "refused") {
return true
}
if netOp.Op == "dial" {
if netSysCall, ok := netOp.Err.(*os.SyscallError); ok {
if netSysCall.Syscall == "connectex" {
return true
}
}
}
}
if sysc, ok := err.(syscall.Errno); ok {
if sysc == syscall.ECONNREFUSED {
return true
}
}
return false
}
func isHandshakeError(err error) bool {
if err == nil {
return false
}
err = lastUnwrap(err)
if reflect.ValueOf(err).Kind() == reflect.ValueOf("").Kind() { // if it's just a string we are forced to check the content
return strings.Contains(err.Error(), "handshake failed")
}
return false
}
func isConnectionResetByPeer(err error) bool {
if err == nil {
return false
}
err = lastUnwrap(err)
if !isHandshakeError(err) {
return false
}
if reflect.ValueOf(err).Kind() == reflect.ValueOf("").Kind() { // if it's just a string we are forced to check the content
return strings.Contains(err.Error(), "connection reset by peer")
}
return false
}
func isIOTimeout(err error) bool {
if err == nil {
return false
}
err = lastUnwrap(err)
if reflect.ValueOf(err).Kind() == reflect.ValueOf("").Kind() { // if it's just a string we are forced to check the content
return strings.Contains(err.Error(), "i/o timeout")
}
errOpError, ok := err.(*net.OpError)
if !ok {
return false
}
return errOpError.Timeout()
}
func isErrorAddressAlreadyInUse(err error) bool {
if err == nil {
return false
}
err = lastUnwrap(err)
if reflect.ValueOf(err).Kind() == reflect.ValueOf("").Kind() { // if it's just a string we are forced to check the content
return strings.Contains(err.Error(), "address already in use")
}
var errOpError *net.OpError
ok := errors.As(err, &errOpError)
if !ok {
return false
}
errSyscallError, ok := errOpError.Err.(*os.SyscallError)
if !ok {
return false
}
if errOpError.Op == "listen" {
if errSyscallError.Syscall == "bind" {
return true
}
}
errErrno, ok := errSyscallError.Err.(syscall.Errno)
if !ok {
return false
}
if errErrno == syscall.EADDRINUSE {
return true
}
return false
}