I am testing accessibility permissions using AXIsProcessTrustedWithOptions.
When app starts, value is correctly returned. However if I change the setting in System Preferences -> Security & Privacy while app is running call to API is still returning the previous value.
Is that a bug?
Here is example code:
bool checkIfAccessibilityEnabledAndDisplayPopup()
{
// Method to check if accessibility is enabled
// Passing YES to kAXTrustedCheckOptionPrompt forces showing popup
NSDictionary *options = #{(bridge id)kAXTrustedCheckOptionPrompt: #YES};
Boolean accessibilityEnabled = AXIsProcessTrustedWithOptions((CFDictionaryRef)options);
return (!!accessibilityEnabled);
}
int main(int argc, const char * argv[]) {
#autoreleasepool {
NSLog(#"Starting");
for (int i=0;i<100;i) {
checkIfAccessibilityEnabledAndDisplayPopup();
[NSThread sleepForTimeInterval:20.0f];
NSDictionary *options = #{(__bridge id)kAXTrustedCheckOptionPrompt: #NO};
Boolean b = AXIsProcessTrustedWithOptions((CFDictionaryRef)options);
Boolean b1 = AXIsProcessTrusted();
NSLog(#"accessibility AXIsProcessTrustedWithOptions--> %d AXIsProcessTrusted --->
%d", b, b1);
}
}
Related
Before Mac OS Big Sur, one could create an ad-hoc network by calling the startIBSSModeWithSSID:security:channel:password:error: function of a CWInterface obtained from a CWWifiClient. It seems that after an update to Big Sur, the above function is deprecated and throws a kCWOperationNotPermittedErr (-3930) error every time.
I tried launching the application from root, and it still refused to create an ad-hoc network. Meanwhile, using the "Create Network" option in the WiFi dropdown menu works with an administrator password.
A previous answer on this site I have come across is outdated and the code does not work anymore. There is a post on the Apple Developer forums created 5 months ago but it remains unanswered, with the "solution" being to file a tech support incident.
This is the code I am using:
#import <Foundation/Foundation.h>
#import <CoreWLAN/CoreWLAN.h>
#import <SecurityFoundation/SFAuthorization.h>
#import <objc/message.h>
int main(int argc, const char * argv[]) {
#autoreleasepool {
bool success = 0;
CWWiFiClient* wifiClient = [CWWiFiClient sharedWiFiClient];
CWInterface* interface = [wifiClient interface];
NSString* namestr = #"very_creative_ssid";
NSData* name = [namestr dataUsingEncoding:NSUTF8StringEncoding];
NSString* pass = #"very_cruel_framework"; // not used
NSError* err = nil;
success = [interface startIBSSModeWithSSID:name
security:kCWIBSSModeSecurityNone
channel:11
password:nil
error:&err];
if (!success) {
NSLog(#"%#", err);
return 1;
}
[NSRunLoop.currentRunLoop run];
}
return 0;
}
Is there a way to programmatically create an ad-hoc network in Big Sur without throwing an error?
Edit: Here is the console output (1 line):
2022-01-12 05:25:03.723 cwlantest[15305:448617] Error Domain=com.apple.coreWLAN.error Code=-3930 "(null)"
I'm going to put this as an answer, if anyone finds anything new or Apple adds this feature in the future, I'll be very happy to be wrong.
TLDR: Not anymore!
Since Apple removed the "Create network..." option from the wifi menubar, the only way to create an ad-hoc network is through Network Sharing. I followed https://www.makeuseof.com/how-to-create-a-secure-ad-hoc-network-in-macos/ under the How to Create a Secure Ad Hoc Network section to make a network:
sudo networksetup -createnetworkservice AdHoc lo0
sudo networksetup -setmanual AdHoc 192.168.1.88 255.255.255.255
And in System Preferences, share your network connection from AdHoc over WiFi.
With that on, I checked the CWInterface.interfaceMode() and it was in HostAP mode. Pure speculation, but I think IBSS was removed completely, it's marked as Deprecated in the developer documentation. -3930 is kCWOperationNotPermittedErr, so I'm not 100% sure that's accurate, but it's possible.
There are private interfaces to set HostAP mode in CoreWLAN:
https://github.com/onmyway133/Runtime-Headers/blob/master/macOS/10.13/CoreWLAN.framework/CWInterface.h https://medium.com/swlh/calling-ios-and-macos-hidden-api-in-style-1a924f244ad1 https://gist.github.com/wolever/4418079
After replacing objc_msgsend with NSInvocation in the last link since objc_msgsend seems to have been removed:
#import <CoreWLAN/CoreWLAN.h>
#import <objc/message.h>
int main(int argc, char* argv[]) {
#autoreleasepool {
int ch;
NSString *ssid = nil, *password = nil;
while((ch = getopt(argc, argv, "s:p:h")) != -1) {
switch(ch) {
case 's':
ssid = [NSString stringWithUTF8String:optarg];
break;
case 'p':
password = [NSString stringWithUTF8String:optarg];
break;
case '?':
case 'h':
default:
printf("USAGE: %s [-s ssid] [-p password] [-h] command\n", argv[0]);
printf("\nOPTIONS:\n");
printf(" -s ssid SSID\n");
printf(" -p password WEP password\n");
printf(" -h Print help\n");
printf("\nCOMMAND:\n");
printf(" status Print interface mode\n");
printf(" start Start Host AP mode\n");
printf(" stop Stop Host AP mode\n");
return 0;
}
}
NSString *command = nil;
if(argv[optind]) {
command = [NSString stringWithUTF8String:argv[optind]];
}
CWInterface *iface = [[CWWiFiClient sharedWiFiClient] interface];
if(!command || [command isEqualToString:#"status"]) {
NSString *mode = nil;
switch(iface.interfaceMode) {
case kCWInterfaceModeStation:
mode = #"Station";
break;
case kCWInterfaceModeIBSS:
mode = #"IBSS";
break;
case kCWInterfaceModeHostAP:
mode = #"HostAP";
break;
case kCWInterfaceModeNone:
default:
mode = #"None";
}
printf("%s\n", [mode UTF8String]);
} else if([command isEqualToString:#"stop"]) {
// Stop Host AP mode
if(getuid() != 0) {
printf("this may need root (trying anyway)...\n");
}
SEL selector = #selector(stopHostAPMode);
NSMethodSignature *signature = [iface methodSignatureForSelector: selector];
NSInvocation *invocation =
[NSInvocation invocationWithMethodSignature:signature];
invocation.target = iface;
invocation.selector = selector;
[invocation invoke];
printf("Done?");
//objc_msgSend(iface, #selector(stopHostAPMode));
} else if([command isEqualToString:#"start"]) {
if(!ssid) {
printf("error: an ssid must be specified\n");
return 1;
}
// known security types:
// 2: no securiry
// 16: wep
// Note: values [-127..127] have been tried, and all but these return errors.
unsigned long long securityType = 2;
if(password) {
if([password length] < 10) {
printf("error: password too short (must be >= 10 characters)\n");
return 1;
}
securityType = 16;
}
NSSet *chans = [iface supportedWLANChannels];
//printf("chan count: %lu\n", [chans count]);
NSEnumerator *enumerator = [chans objectEnumerator];
CWChannel *channel;
while ((channel = [enumerator nextObject])) {
//printf("channel: %lu\n", [channel channelNumber]);
if ([channel channelNumber] == 11)
break;
}
printf("Found Channel: %d\n", channel.channelNumber);
// Start Host AP mode
NSError *error = nil;
NSError **errorptr = &error;
SEL selector = #selector(startHostAPModeWithSSID:securityType:channel:password:error:);
NSMethodSignature *signature = [iface methodSignatureForSelector: selector];
NSInvocation *invocation =
[NSInvocation invocationWithMethodSignature:signature];
invocation.target = iface;
invocation.selector = selector;
NSString * ssidstr = #"Test";
NSString * pass = #"barbarbarr";
NSData * ssidArg = [ssidstr dataUsingEncoding:NSUTF8StringEncoding];
[invocation setArgument: &ssidArg atIndex:2];
[invocation setArgument: &securityType atIndex:3];
[invocation setArgument: &channel atIndex:4];
[invocation setArgument: &pass atIndex:5];
[invocation setArgument: &errorptr atIndex:6];
[invocation invoke];
BOOL success;
[invocation getReturnValue:&success];
if (!success) {
printf("startHostAPModeWithSSID error: %s\n", [(*errorptr).localizedDescription UTF8String]);
return 1;
} else {
printf("Success?\n");
return 0;
}
}
return 0;
}
}
./hostap stop does successfully kick me out of hostap mode started from network sharing, but ./hostap start fails with -3903 kCWNotSupportedErr.
Also, using startHostAPMode: without other settings does succeed, but the wifi menu shows WiFi: Internet Sharing, so I think this is a private api meant specifically for network sharing and will likely need other configuration to get working. You could potentially continue down that road, but it didn't look very promising. The best bet is to just use network sharing or potentially look into scripting System Preferences with AppleScript if you really want a scripted approach.
The functions IOHIDGetAccelerationWithKey and IOHIDSetAccelerationWithKey are deprecated since macOS 10.12, therefore I am trying to implement the same using other IO*-methods.
I have never worked with IOKit, thus, all I can do is google for functions and try to get it to work.
Now I found this: Can't edit IORegistryEntry which has an example of how to change TrackpadThreeFingerSwipe property, however it is using a function which is not defined for me: getEVSHandle. Googling for it reveals only that it should be Found in the MachineSettings framework, however I can't seem to add any "MachineSettings" framework in Xcode 11.
What should I do? Current code is like:
#import <Foundation/Foundation.h>
#import <IOKit/hidsystem/IOHIDLib.h>
int main(int argc, const char * argv[]) {
#autoreleasepool {
NSInteger value = -65536;
CFNumberRef number = CFNumberCreate(kCFAllocatorDefault, kCFNumberNSIntegerType, &value);
CFMutableDictionaryRef propertyDict = CFDictionaryCreateMutable(kCFAllocatorDefault, 1, NULL, NULL);
CFDictionarySetValue(propertyDict, #"HIDMouseAcceleration", number);
io_connect_t connect = getEVSHandle(); // ???
if (!connect)
{
NSLog(#"Unable to get EVS handle");
}
res = IOConnectSetCFProperties(connect, propertyDict);
if (res != KERN_SUCCESS)
{
NSLog(#"Failed to set mouse acceleration (%d)", res);
}
IOObjectRelease(service);
CFRelease(propertyDict);
}
return 0;
}
The following works (tested with Xcode 11.2 / macOS 10.15)
#import <Foundation/Foundation.h>
#import <IOKit/hidsystem/IOHIDLib.h>
int main(int argc, const char * argv[]) {
#autoreleasepool {
io_service_t service = IORegistryEntryFromPath(kIOMasterPortDefault,
kIOServicePlane ":/IOResources/IOHIDSystem");
NSDictionary *parameters = (__bridge NSDictionary *)IORegistryEntryCreateCFProperty(service,
CFSTR(kIOHIDParametersKey), kCFAllocatorDefault, kNilOptions);
NSLog(#"%#", parameters);
NSMutableDictionary *newParameters = [parameters mutableCopy];
newParameters[#"HIDMouseAcceleration"] = #(12345);
kern_return_t result = IORegistryEntrySetCFProperty(service,
CFSTR(kIOHIDParametersKey), (__bridge CFDictionaryRef)newParameters);
NSLog(kIOReturnSuccess == result ? #"Updated" : #"Failed");
IOObjectRelease(service);
}
return 0;
}
Some relevant info I am on OSX using GCD in Objective-C. I have a background task that produces a very large const char * this is then re-introduced into a new background task. This cycle repeats essentially until the const char* is empty. Currently I am creating and using NSStrings in the blocks and then going back to char* immediately. As you can imagine this does a ton of unnecessary copying of all that.
I am wondering how __block variables work for non-objects or how I can get away from NSStrings?
Or
How is memory managed for non-object types?
It is currently just blowing up with ~2 gigs of memory all from the strings.
Here is how it currently looks:
-(void)doSomething:(NSString*)input{
__block NSString* blockCopy = input;
void (^blockTask)(void);
blockTask = ^{
const char* input = [blockCopy UTF8String];
//remainder will point to somewhere along input
const char* remainder = NULL;
myCoolCFunc(input,&remainder);
if(remainder != NULL && remainder[0] != '\0'){
//this is whats killing me the NSString creation of remainder
[self doSomething:#(remainder)];
}
}
/*...create background queue if needed */
dispatch_async(backgroundQueue,blockTask);
}
There is no need to use NSString at all and no need to use the __block attribute:
-(void)doSomething:(const char *)input{
void (^blockTask)(void);
blockTask = ^{
const char* remainder = NULL;
myCoolCFunc(input,&remainder);
if(remainder != NULL && remainder[0] != '\0'){
[self doSomething:remainder];
}
}
/*...create background queue if needed */
dispatch_async(backgroundQueue,blockTask);
}
There is also little need to use recursion either, as an iterative approach is also possible.
blockTask = ^{
const char* remainder = NULL;
while (YES) {
myCoolCFunc(input,&remainder);
if(remainder == NULL || remainder[0] == '\0')
break;
input = remainder;
}
}
To show errors on some condition, I am using NSRunAlertPanel on Mac OS X (on the code which is ported from Windows, where I was using MessageBox).
Before actual creation of Windows, some code is being run and calling this code to show some conditional error.
In a thread com.apple.libdispatch-manager, under following call stack
0 _dispatch_mgr_invoke
1 _dispatch_mgr_thread
it is giving EXC_BAD_INSTRUCTION
Is it because Windows is not created before NSRunAlertPanel?
What is the reason of this runtime error? What is exact alternative of MessageBox on Mac OS X?
Long ShowDebugMessageBox (const wchar_t * Message, const wchar_t * Title)
{
NSString * message; ///< Message.
NSString * title; ///< Title.
NSInteger response; ///< response.
message = WideToNSString (Message);
title = WideToNSString (Title);
//response = NSRunAlertPanel(title, message, #"Yes", #"No", #"Cancel");
response = NSRunCriticalAlertPanel (title, message, #"Okay", #"Cancel", nil);
switch(response) {
case NSAlertDefaultReturn:
return IDYES;
case NSAlertAlternateReturn:
return IDNO;
default:
return IDCANCEL;
}
}
NSString * WideToNSString (const wchar_t * Str)
{
if(!Str) {
return nil;
}
NSString * str; ///< String in NSString.
#if CP_SIZEOFWCHAR == 4
str = [[NSString alloc] initWithBytes: (CVPtr) Str
length: sizeof(wchar_t)* wcslen(Str)
encoding: NSUTF32LittleEndianStringEncoding];
//encoding: NSUTF32StringEncoding];
#else
str = [[NSString alloc] initWithBytes: (CVPtr) Str
length: sizeof(wchar_t)* wcslen(Str);
encoding: NSUTF16LittleEndianStringEncoding];
//encoding: NSUTF16StringEncoding];
#endif
return str;
}
class File {
public:
int Open(char * fname, int mode)
{
fd = open(fname, mode);
}
int Close()
{
close(fd);
//fd = 0; //CAUSE of the PROBLEM
}
~File ()
{
//ALERT Display message box about the error.
ALERT(fd != 0);
}
private:
int fd;
};
This is the code to show the message box.
Code to get NSString from wchar_t * string (Wide string) is perfectly fine and was tested. It is used in many places and running fine.
Same code on the other application (which creates Window first) is running fine.
Problem occurs when the destructor of File is called. Since fd is not 0, it shows message box and cause the problem.
When fd is set to 0, no alert box is displayed for constructor. However, other alert are shown but no problem occurred.
Is it due fd?
You haven't provided enough information to say what is causing the exception (please show the code).
I use NSRunCriticalAlertPanel() to display fatal errors in my app, which I am able to call pretty much any time I like:
void criticalAlertPanel(NSString *title, NSString *fmt, ...)
{
va_list va;
va_start(va, fmt);
NSString *message = [[NSString alloc] initWithFormat:fmt arguments:va];
va_end(va);
NSRunCriticalAlertPanel(title, message, #"OK", nil, nil);
}
(this code is ARC enabled).
And note that I can not pass in a ViewController pointer due to this function being passed into another function.
static int callback(void *NotUsed, int argc, char **argv, char **azColName)
{
NSString *str = #"";
int i;
for(i=0; i<argc; i++)
{
printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
str = [NSString stringWithFormat:#"%#\n%s = %s\n", str, azColName[i], argv[i] ? argv[i] : "NULL"];
}
printf("\n");
//tvDisplay is a UITextView
[tvDisplay setText:str]; // <---- ??? how to get to an iVar
return 0;
}
the call:
rc = sqlite3_exec(db, pSQL[i], callback, 0, &zErrMsg);
Callback functions typically have an argument that allows you to pass along arbitrary data (it's usually a void * called context or something similar). You can pass in the object that you need to access when you set up the callback function, and then retrieve it within the callback function:
static void myCallback(int someResult, void *context) {
SomeClass *someObject = (SomeClass *)context;
[someObject doStuff];
}
In your particular case, the place for the "arbitrary data that you want to access in the callback function" is the void * argument right after the callback function itself that you have presently set to 0:
int sqlite3_exec(
sqlite3*, /* An open database */
const char *sql, /* SQL to be evaluated */
int (*callback)(void*,int,char**,char**), /* Callback function */
void *, /* 1st argument to callback */
char **errmsg /* Error msg written here */
);
Keep in mind that you're responsible for ensuring that any data you stick in there remains valid while the callback has not yet returned, and, if necessary, free it in the callback.