# Get demangled symbolsnm-Ccom.apple.driver.AppleJPEGDriver# Demangled symbols from stdinc++filt__ZN16IOUserClient202222dispatchExternalMethodEjP31IOExternalMethodArgumentsOpaquePK28IOExternalMethodDispatch2022mP8OSObjectPvIOUserClient2022::dispatchExternalMethod(unsignedint,IOExternalMethodArgumentsOpaque*,IOExternalMethodDispatch2022const*,unsignedlong,OSObject*,void*)
#import <Foundation/Foundation.h>
#import <IOKit/IOKitLib.h>
int main(int argc, const char * argv[]) {
@autoreleasepool {
// Get a reference to the service using its name
CFMutableDictionaryRef matchingDict = IOServiceMatching("YourServiceNameHere");
if (matchingDict == NULL) {
NSLog(@"Failed to create matching dictionary");
return -1;
}
// Obtain an iterator over all matching services
io_iterator_t iter;
kern_return_t kr = IOServiceGetMatchingServices(kIOMasterPortDefault, matchingDict, &iter);
if (kr != KERN_SUCCESS) {
NSLog(@"Failed to get matching services");
return -1;
}
// Get a reference to the first service (assuming it exists)
io_service_t service = IOIteratorNext(iter);
if (!service) {
NSLog(@"No matching service found");
IOObjectRelease(iter);
return -1;
}
// Open a connection to the service
io_connect_t connect;
kr = IOServiceOpen(service, mach_task_self(), 0, &connect);
if (kr != KERN_SUCCESS) {
NSLog(@"Failed to open service");
IOObjectRelease(service);
IOObjectRelease(iter);
return -1;
}
// Call a method on the service
// Assume the method has a selector of 0, and takes no arguments
kr = IOConnectCallScalarMethod(connect, 0, NULL, 0, NULL, NULL);
if (kr != KERN_SUCCESS) {
NSLog(@"Failed to call method");
}
// Cleanup
IOServiceClose(connect);
IOObjectRelease(service);
IOObjectRelease(iter);
}
return 0;
}
There are 其他 functions that can be used to call IOKit functions apart of IOConnectCallScalarMethod like IOConnectCallMethod, IOConnectCallStructMethod...
反向工程驱动入口点
You could obtain these for example from a 固件镜像 (ipsw). Then, load it into your favourite decompiler.
You could start decompiling the externalMethod function as this is the driver function that will be receiving the call and calling the correct function:
