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//
// Copyright 2014-2023 Cristian Maglie. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//
package enumerator
// #cgo LDFLAGS: -framework CoreFoundation -framework IOKit
// #include <IOKit/IOKitLib.h>
// #include <CoreFoundation/CoreFoundation.h>
// #include <stdlib.h>
import "C"
import (
"errors"
"fmt"
"time"
"unsafe"
)
func nativeGetDetailedPortsList() ([]*PortDetails, error) {
var ports []*PortDetails
services, err := getAllServices("IOSerialBSDClient")
if err != nil {
return nil, &PortEnumerationError{causedBy: err}
}
for _, service := range services {
defer service.Release()
port, err := extractPortInfo(io_registry_entry_t(service))
if err != nil {
return nil, &PortEnumerationError{causedBy: err}
}
ports = append(ports, port)
}
return ports, nil
}
func extractPortInfo(service io_registry_entry_t) (*PortDetails, error) {
port := &PortDetails{}
// If called too early the port may still not be ready or fully enumerated
// so we retry 5 times before returning error.
for retries := 5; retries > 0; retries-- {
name, err := service.GetStringProperty("IOCalloutDevice")
if err == nil {
port.Name = name
break
}
if retries == 0 {
return nil, fmt.Errorf("error extracting port info from device: %w", err)
}
time.Sleep(50 * time.Millisecond)
}
port.IsUSB = false
validUSBDeviceClass := map[string]bool{
"IOUSBDevice": true,
"IOUSBHostDevice": true,
}
usbDevice := service
var searchErr error
for !validUSBDeviceClass[usbDevice.GetClass()] {
if usbDevice, searchErr = usbDevice.GetParent("IOService"); searchErr != nil {
break
}
}
if searchErr == nil {
// It's an IOUSBDevice
vid, _ := usbDevice.GetIntProperty("idVendor", C.kCFNumberSInt16Type)
pid, _ := usbDevice.GetIntProperty("idProduct", C.kCFNumberSInt16Type)
serialNumber, _ := usbDevice.GetStringProperty("USB Serial Number")
//product, _ := usbDevice.GetStringProperty("USB Product Name")
//manufacturer, _ := usbDevice.GetStringProperty("USB Vendor Name")
//fmt.Println(product + " - " + manufacturer)
port.IsUSB = true
port.VID = fmt.Sprintf("%04X", vid)
port.PID = fmt.Sprintf("%04X", pid)
port.SerialNumber = serialNumber
}
return port, nil
}
func getAllServices(serviceType string) ([]io_object_t, error) {
i, err := getMatchingServices(serviceMatching(serviceType))
if err != nil {
return nil, err
}
defer i.Release()
var services []io_object_t
tries := 0
for tries < 5 {
// Extract all elements from iterator
if service, ok := i.Next(); ok {
services = append(services, service)
continue
}
// If the list of services is empty or the iterator is still valid return the result
if len(services) == 0 || i.IsValid() {
return services, nil
}
// Otherwise empty the result and retry
for _, s := range services {
s.Release()
}
services = []io_object_t{}
i.Reset()
tries++
}
// Give up if the iteration continues to fail...
return nil, fmt.Errorf("IOServiceGetMatchingServices failed, data changed while iterating")
}
// serviceMatching create a matching dictionary that specifies an IOService class match.
func serviceMatching(serviceType string) C.CFMutableDictionaryRef {
t := C.CString(serviceType)
defer C.free(unsafe.Pointer(t))
return C.IOServiceMatching(t)
}
// getMatchingServices look up registered IOService objects that match a matching dictionary.
func getMatchingServices(matcher C.CFMutableDictionaryRef) (io_iterator_t, error) {
var i C.io_iterator_t
err := C.IOServiceGetMatchingServices(C.kIOMasterPortDefault, C.CFDictionaryRef(matcher), &i)
if err != C.KERN_SUCCESS {
return 0, fmt.Errorf("IOServiceGetMatchingServices failed (code %d)", err)
}
return io_iterator_t(i), nil
}
// CFStringRef
type cfStringRef C.CFStringRef
func cfStringCreateWithString(s string) cfStringRef {
c := C.CString(s)
defer C.free(unsafe.Pointer(c))
return cfStringRef(C.CFStringCreateWithCString(
C.kCFAllocatorDefault, c, C.kCFStringEncodingMacRoman))
}
func (ref cfStringRef) Release() {
C.CFRelease(C.CFTypeRef(ref))
}
// CFTypeRef
type cfTypeRef C.CFTypeRef
func (ref cfTypeRef) Release() {
C.CFRelease(C.CFTypeRef(ref))
}
// io_registry_entry_t
type io_registry_entry_t C.io_registry_entry_t
func (me *io_registry_entry_t) GetParent(plane string) (io_registry_entry_t, error) {
cPlane := C.CString(plane)
defer C.free(unsafe.Pointer(cPlane))
var parent C.io_registry_entry_t
err := C.IORegistryEntryGetParentEntry(C.io_registry_entry_t(*me), cPlane, &parent)
if err != 0 {
return 0, errors.New("No parent device available")
}
return io_registry_entry_t(parent), nil
}
func (me *io_registry_entry_t) CreateCFProperty(key string) (cfTypeRef, error) {
k := cfStringCreateWithString(key)
defer k.Release()
property := C.IORegistryEntryCreateCFProperty(C.io_registry_entry_t(*me), C.CFStringRef(k), C.kCFAllocatorDefault, 0)
if property == 0 {
return 0, errors.New("Property not found: " + key)
}
return cfTypeRef(property), nil
}
func (me *io_registry_entry_t) GetStringProperty(key string) (string, error) {
property, err := me.CreateCFProperty(key)
if err != nil {
return "", err
}
defer property.Release()
if ptr := C.CFStringGetCStringPtr(C.CFStringRef(property), 0); ptr != nil {
return C.GoString(ptr), nil
}
// in certain circumstances CFStringGetCStringPtr may return NULL
// and we must retrieve the string by copy
buff := make([]C.char, 1024)
if C.CFStringGetCString(C.CFStringRef(property), &buff[0], 1024, 0) != C.true {
return "", fmt.Errorf("Property '%s' can't be converted", key)
}
return C.GoString(&buff[0]), nil
}
func (me *io_registry_entry_t) GetIntProperty(key string, intType C.CFNumberType) (int, error) {
property, err := me.CreateCFProperty(key)
if err != nil {
return 0, err
}
defer property.Release()
var res int
if C.CFNumberGetValue((C.CFNumberRef)(property), intType, unsafe.Pointer(&res)) != C.true {
return res, fmt.Errorf("Property '%s' can't be converted or has been truncated", key)
}
return res, nil
}
func (me *io_registry_entry_t) Release() {
C.IOObjectRelease(C.io_object_t(*me))
}
func (me *io_registry_entry_t) GetClass() string {
class := make([]C.char, 1024)
C.IOObjectGetClass(C.io_object_t(*me), &class[0])
return C.GoString(&class[0])
}
// io_iterator_t
type io_iterator_t C.io_iterator_t
// IsValid checks if an iterator is still valid.
// Some iterators will be made invalid if changes are made to the
// structure they are iterating over. This function checks the iterator
// is still valid and should be called when Next returns zero.
// An invalid iterator can be Reset and the iteration restarted.
func (me *io_iterator_t) IsValid() bool {
return C.IOIteratorIsValid(C.io_iterator_t(*me)) == C.true
}
func (me *io_iterator_t) Reset() {
C.IOIteratorReset(C.io_iterator_t(*me))
}
func (me *io_iterator_t) Next() (io_object_t, bool) {
res := C.IOIteratorNext(C.io_iterator_t(*me))
return io_object_t(res), res != 0
}
func (me *io_iterator_t) Release() {
C.IOObjectRelease(C.io_object_t(*me))
}
// io_object_t
type io_object_t C.io_object_t
func (me *io_object_t) Release() {
C.IOObjectRelease(C.io_object_t(*me))
}
func (me *io_object_t) GetClass() string {
class := make([]C.char, 1024)
C.IOObjectGetClass(C.io_object_t(*me), &class[0])
return C.GoString(&class[0])
}
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