feature: 图片解码

AppHook/HookProtector.h

@@ -13,6 +13,7 @@
 #include <sys/cdefs.h>
 #import <dlfcn.h>
 #import <sys/sysctl.h>
+#import <sys/syscall.h>
 
 enum {
     ePtAttachDeprecated __deprecated_enum_msg("PT_ATTACH is deprecated. See PT_ATTACHEXC") = 10
@@ -48,6 +49,7 @@ __END_DECLS
 
 typedef int (*ptrace_ptr_t)(int _request, pid_t _pid, caddr_t _addr, int _data);
 typedef int (*sysctl_ptr_t)(int *name, u_int namelen, void *info, size_t *infosize, void *newInfo, size_t newInfoSize);
+typedef int (*syscall_ptr_t)(int, ...);
 
 static __attribute__((always_inline)) void quit_process () {
 #ifdef __arm64__
@@ -178,8 +180,8 @@ void disable_gdb_via_hidden_sysctl(void) {
     });
     dispatch_resume(timer);
 }
-
-static __attribute__((always_inline)) void anti_debug() {
+ 
+static __attribute__((always_inline)) void anti_debug(void) {
 #ifdef __arm64__
     __asm__("mov X0, #31\n"
             "mov X1, #0\n"
@@ -192,4 +194,57 @@ static __attribute__((always_inline)) void anti_debug() {
 #endif
 }
 
+void disable_gdb_via_syscall (void) {
+    syscall(SYS_ptrace, PT_DENY_ATTACH, 0, 0);
+}
+
+bool isInDebugModeViaHiddenSyscall(void) {
+    unsigned char funcCallerName[] = {
+        (KEY ^ 's'),
+        (KEY ^ 'y'),
+        (KEY ^ 's'),
+        (KEY ^ 'c'),
+        (KEY ^ 'a'),
+        (KEY ^ 'l'),
+        (KEY ^ 'l'),
+        (KEY ^ '\0'),
+    };
+    unsigned char * callerP = funcCallerName;
+    //再次异或之后恢复原本的值
+    while (((*callerP) ^= KEY) != '\0') callerP++;
+
+    int name[4];
+    name[0] = CTL_KERN;     // 内核
+    name[1] = KERN_PROC;    // 查询进程
+    name[2] = KERN_PROC_PID;    // 通过进程 ID 来查找
+    name[3] = getpid();     // 当前进程 ID
+
+    struct kinfo_proc info; // 接收查询信息，利用结构体传递引用
+    size_t infoSize = sizeof(info);
+    void *handle = dlopen(0, RTLD_GLOBAL | RTLD_NOW);
+    syscall_ptr_t caller_ptr = dlsym(handle, (const char *)funcCallerName);
+
+    if (caller_ptr(SYS_sysctl, name, sizeof(name)/sizeof(*name), &info, &infoSize, 0, 0)) {
+        dlclose(handle);
+        return NO;
+    }
+    dlclose(handle);
+    return info.kp_proc.p_flag & P_TRACED;
+}
+
+void disable_gdb_via_hidden_syscall (void) {
+    static dispatch_source_t timer;
+    timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, dispatch_get_global_queue(0, 0));
+    dispatch_source_set_timer(timer, DISPATCH_TIME_NOW, 1 * NSEC_PER_SEC, 0 * NSEC_PER_SEC);
+    dispatch_source_set_event_handler(timer, ^{
+        if (isInDebugModeViaHiddenSyscall()) {
+            NSLog(@"在调试模式");
+            quit_process();
+        } else {
+            NSLog(@"不在调试模式");
+        }
+    });
+    dispatch_resume(timer);
+}
+
 #endif /* HookProtector_h */

AppHookProtector/main.m

@@ -22,6 +22,8 @@ int main(int argc, char * argv[]) {
 //        disable_gdb_via_hidden_ptrace();
 //        disable_gdb_via_hidden_sysctl();
         anti_debug();
+//        disable_gdb_via_syscall();
+        disable_gdb_via_hidden_syscall();
 #endif
         // Setup code that might create autoreleased objects goes here.
         appDelegateClassName = NSStringFromClass([AppDelegate class]);

GCDExplore/ViewController.m

@@ -20,8 +20,71 @@ - (void)viewDidLoad {
 //    [self testBloakAndQueue];
     // dead lock
     // dispatch_sync(dispatch_get_main_queue(), nil);
+    [self testDispatchGroup];
 }
 
+- (void)testDispatchGroup {
+    // D - A,B
+    dispatch_queue_t group1 = dispatch_group_create();
+    // E - B,C
+    dispatch_queue_t group2 = dispatch_group_create();
+    // F - D,E
+    dispatch_queue_t group3 = dispatch_group_create();
+
+    dispatch_group_enter(group1);
+    dispatch_async(dispatch_get_global_queue(0, 0), ^{
+        for (int i = 0; i < 3; i++) {
+            NSLog(@"A Task");
+        }
+        dispatch_group_leave(group1);
+    });
+
+    dispatch_group_enter(group1);
+    dispatch_group_enter(group2);
+    dispatch_async(dispatch_get_global_queue(0, 0), ^{
+        for (int i = 0; i < 3; i++) {
+            NSLog(@"B Task");
+        }
+        dispatch_group_leave(group1);
+        dispatch_group_enter(group2);
+    });
+
+    dispatch_group_enter(group2);
+    dispatch_async(dispatch_get_global_queue(0, 0), ^{
+        for (int i = 0; i < 3; i++) {
+            NSLog(@"C Task");
+        }
+        dispatch_group_leave(group2);
+    });
+
+    dispatch_group_enter(group3);
+    dispatch_group_notify(group1, dispatch_get_global_queue(0, 0), ^{
+        dispatch_async(dispatch_get_global_queue(0, 0), ^{
+            for (int i = 0; i < 3; i++) {
+                NSLog(@"D Task");
+            }
+            dispatch_group_leave(group3);
+        });
+    });
+
+    dispatch_group_enter(group3);
+    dispatch_group_notify(group2, dispatch_get_global_queue(0, 0), ^{
+        dispatch_async(dispatch_get_global_queue(0, 0), ^{
+            for (int i = 0; i < 3; i++) {
+                NSLog(@"E Task");
+            }
+            dispatch_group_leave(group3);
+        });
+    });
+
+    dispatch_group_notify(group3, dispatch_get_global_queue(0, 0), ^{
+        dispatch_async(dispatch_get_global_queue(0, 0), ^{
+            for (int i = 0; i < 3; i++) {
+                NSLog(@"F Task");
+            }
+        });
+    });
+}
 
 - (void)testDeadLock {
     dispatch_queue_t queue  = dispatch_queue_create("test", DISPATCH_QUEUE_SERIAL);

ImageDecode/AppDelegate.h

@@ -0,0 +1,15 @@
+//
+//  AppDelegate.h
+//  ImageDecode
+//
+//  Created by Unix_Kernel on 7/17/24.
+//  Copyright © 2024 杭城小刘. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+@interface AppDelegate : UIResponder <UIApplicationDelegate>
+
+
+@end
+

ImageDecode/AppDelegate.m

@@ -0,0 +1,41 @@
+//
+//  AppDelegate.m
+//  ImageDecode
+//
+//  Created by Unix_Kernel on 7/17/24.
+//  Copyright © 2024 杭城小刘. All rights reserved.
+//
+
+#import "AppDelegate.h"
+
+@interface AppDelegate ()
+
+@end
+
+@implementation AppDelegate
+
+
+- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
+    // Override point for customization after application launch.
+    return YES;
+}
+
+
+#pragma mark - UISceneSession lifecycle
+
+
+- (UISceneConfiguration *)application:(UIApplication *)application configurationForConnectingSceneSession:(UISceneSession *)connectingSceneSession options:(UISceneConnectionOptions *)options {
+    // Called when a new scene session is being created.
+    // Use this method to select a configuration to create the new scene with.
+    return [[UISceneConfiguration alloc] initWithName:@"Default Configuration" sessionRole:connectingSceneSession.role];
+}
+
+
+- (void)application:(UIApplication *)application didDiscardSceneSessions:(NSSet<UISceneSession *> *)sceneSessions {
+    // Called when the user discards a scene session.
+    // If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions.
+    // Use this method to release any resources that were specific to the discarded scenes, as they will not return.
+}
+
+
+@end

ImageDecode/Assets.xcassets/AccentColor.colorset/Contents.json

@@ -0,0 +1,11 @@
+{
+  "colors" : [
+    {
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

ImageDecode/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -0,0 +1,13 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "platform" : "ios",
+      "size" : "1024x1024"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

ImageDecode/Assets.xcassets/Contents.json

@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

ImageDecode/Assets.xcassets/peacock.imageset/Contents.json

@@ -0,0 +1,21 @@
+{
+  "images" : [
+    {
+      "filename" : "peacock-1169961.jpg",
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

ImageDecode/Base.lproj/LaunchScreen.storyboard

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="13122.16" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="13104.12"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="EHf-IW-A2E">
+            <objects>
+                <viewController id="01J-lp-oVM" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" xcode11CocoaTouchSystemColor="systemBackgroundColor" cocoaTouchSystemColor="whiteColor"/>
+                        <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="53" y="375"/>
+        </scene>
+    </scenes>
+</document>

ImageDecode/Base.lproj/Main.storyboard

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="13122.16" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="BYZ-38-t0r">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="13104.12"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="tne-QT-ifu">
+            <objects>
+                <viewController id="BYZ-38-t0r" customClass="ViewController" customModuleProvider="" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" xcode11CocoaTouchSystemColor="systemBackgroundColor" cocoaTouchSystemColor="whiteColor"/>
+                        <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
+            </objects>
+        </scene>
+    </scenes>
+</document>

ImageDecode/Info.plist

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>UIApplicationSceneManifest</key>
+	<dict>
+		<key>UIApplicationSupportsMultipleScenes</key>
+		<false/>
+		<key>UISceneConfigurations</key>
+		<dict>
+			<key>UIWindowSceneSessionRoleApplication</key>
+			<array>
+				<dict>
+					<key>UISceneConfigurationName</key>
+					<string>Default Configuration</string>
+					<key>UISceneDelegateClassName</key>
+					<string>SceneDelegate</string>
+					<key>UISceneStoryboardFile</key>
+					<string>Main</string>
+				</dict>
+			</array>
+		</dict>
+	</dict>
+</dict>
+</plist>

ImageDecode/SceneDelegate.h

@@ -0,0 +1,16 @@
+//
+//  SceneDelegate.h
+//  ImageDecode
+//
+//  Created by Unix_Kernel on 7/17/24.
+//  Copyright © 2024 杭城小刘. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+@interface SceneDelegate : UIResponder <UIWindowSceneDelegate>
+
+@property (strong, nonatomic) UIWindow * window;
+
+@end
+