yulingtianxia / blockhook Goto Github PK

我的需求是hook UIAlertAction里的点击block回调，用BlockHook的过程中碰到了self.block提前被释放，导致crash。我不知道是因为UIAlertController被释放的原因还是其他的原因.

希望能够提供一下libffi编译成静态库的指南，libffi官方lib编译报错

2020-08-11 11:51:17.776563+0800 CJJFramework[4984:91100] hooked block
2020-08-11 11:51:17.776813+0800 CJJFramework[4984:91100] hook before block! invocation:<BHInvocation: 0x600002853a30>
2020-08-11 11:51:17.776960+0800 CJJFramework[4984:91100] 3 + 5 = 8, z is a NSObject: <NSObject: 0x60000017ca30>
2020-08-11 11:51:17.777070+0800 CJJFramework[4984:91100] let me see original result: 0
2020-08-11 11:51:17.777185+0800 CJJFramework[4984:91100] hook instead: '+' -> '*'
2020-08-11 11:51:17.777286+0800 CJJFramework[4984:91100] hook after block! 3 * 5 = 15
2020-08-11 11:51:17.777390+0800 CJJFramework[4984:91100] hooked result:15
2020-08-11 11:51:17.777496+0800 CJJFramework[4984:91100] remove tokens, original block
2020-08-11 11:51:17.777599+0800 CJJFramework[4984:91100] 3 + 5 = 8, z is a NSObject: <NSObject: 0x60000017ca30>
2020-08-11 11:51:17.777791+0800 CJJFramework[4984:91100] original result:8
2020-08-11 11:51:17.778207+0800 CJJFramework[4984:91100] block dead! token:<BHToken: 0x60000315a490>

少了这一句hook after block! 3 * 5 = 8

希望能否帮忙发布下最新版本

Xcode alert following error when archive:
bitcode bundle could not be generated because '.../Pods/BlockHook/libffi/libffi_bh.a(ffi_arm.o)' was built without full bitcode. All object files and libraries for bitcode must be generated from Xcode Archive or Install build for architecture armv7

请问libffi有审核风险吗

现在 我需要hook网络接口返回的block，发现 如果是 NSMallocBlock 捕获到里面BHFFIClosureFunc 不走 不知道为啥？

文档上写 FFI_BAD_ABI if the abi parameter is invalid.

萌新不太懂。。。请大神指教

https://github.com/Assuner-Lee/Stinger

代码如下：

- (void)blockHookTest {
 
    int (^block)(int, int) = ^int(int x, int y) {
       int result = x + y;
       NSLog(@"%d + %d = %d", x, y, result);
       return result;
    };
        
    BHToken *tokenBefore = [block block_hookWithMode:BlockHookModeBefore usingBlock:^(BHInvocation *invocation, int x, int y){
        NSLog(@"hook block before");
    }];
    
    block(3, 5);
    
    [tokenBefore remove];
}

运行后，会导致此处奔溃：

若block修改为Malloc类型的话，就能正常hook。

麻烦解答一下这个问题，感谢~

@yulingtianxia
按照 Example 操作后提示错误：BlockHook/libffi/darwin_ios/src/x86/unix64_x86_64.S:33:10: 'fficonfig.h' file not found

RT

void xm_dispatch_async(dispatch_queue_t queue, dispatch_block_t block) {

if (__enable) {
    
    dispatch_block_t chgBlock = block;
    if ([block isKindOfClass:NSClassFromString(@"__NSStackBlock")]) {
        chgBlock = [block copy];
    }
    
    [chgBlock block_hookWithMode:BlockHookModeInstead
                      usingBlock:^(BHToken *token){
                              
                              double begin = [[NSDate date] timeIntervalSince1970];
                              [token invokeOriginalBlock];
                              double end = [[NSDate date] timeIntervalSince1970];
                              //[token remove];
                              
                              [[XMAPMCPUMonitor monitor] setThread:[NSThread currentThread]
                                                        beginStamp:begin
                                                          endStamp:end];
                              
                          }];
}

orig_dispatch_async(queue, block);

}

hook掉 gcd创建方法，在hook block中调用之前的blok会有一定概率crash

0 0x0000000105400a38 ffi_call_int + 276
1 0x00000001040d886c -[BHToken invokeOriginalBlock] + 180
2 0x00000001040d886c -[BHToken invokeOriginalBlock] + 180
3 0x000000010442dc78 __xm_dispatch_async_block_invoke + 160