项目中fishhook的一次实用

fishhook下载地址

• 三种环境中选择不同的plist文件配置

main.m

#import "fishhook.h"
#import <dlfcn.h>
#pragma mark 根据环境选择plist与der文件

// 自定义的close函数
static int (*orig_close)(int);
// 定义函数的指针变量，用户保存原来的函数指针（函数其实也是一个地址）
static int (*orig_open)(const char *, int, ...);

// 自定义的close函数
int my_close(int fd) {
    //    printf("Calling real close(%d)\n", fd);
    return orig_close(fd);
}

// 自定义的open函数
int my_open(const char *path, int oflag, ...) {
    va_list ap = {0};
    mode_t mode = 0;
    
    if ((oflag & O_CREAT) != 0) {
        // mode only applies to O_CREAT
        va_start(ap, oflag);
        mode = va_arg(ap, int);
        va_end(ap);
        //        printf("Calling real open('%s', %d, %d)\n", path, oflag, mode);
        return orig_open(path, oflag, mode);
    } else {
        //        printf("Calling real open('%s', %d)\n", path, oflag);
        
        NSString *pathOri = [[NSString alloc]initWithUTF8String:path];
       
        /** 获取plist的时候*/
        if ([pathOri rangeOfString:@"应用名.app/文件名.plist"].length > 0) {
            NSLog(@"\n打开的路径====plist========\n%@",pathOri);
            // 环境1
            if ([@"请求路径"isEqualToString:@"https://环境1.com"]) {
                path = [[pathOri stringByReplacingOccurrencesOfString:@"文件名.plist" withString:@"文件名_环境1.plist"] UTF8String];
            }else if ([@"请求路径" isEqualToString:@"http://环境2.com"]){
                // 环境2
                path = [[pathOri stringByReplacingOccurrencesOfString:@"文件名.plist" withString:@"文件名_环境2.plist"] UTF8String];
            }else{
                // 生产
                path = [[pathOri stringByReplacingOccurrencesOfString:@"文件名.plist" withString:@"文件名_生产.plist"] UTF8String];
            }
            
            NSLog(@"\n返回的路径====plist========\n%s",path);
        }
        
        
        return orig_open(path, oflag, mode);
    }
}

#pragma mark plist方法调用
void modifyThePlistFile(int argc, char * argv[]){
    struct rebinding binds[2];
    // orig_close是一个函数指针，(void *)&orig_close 是一个返回参数，所以用取地址，(void *)&orig_open也是类似的
    struct rebinding bind1 = {"close", my_close, (void *)&orig_close};
    binds[0] = bind1;
    binds[1] = (struct rebinding){"open", my_open, (void *)&orig_open};
    rebind_symbols(binds, 2);
    
    // Open our own binary and print out first 4 bytes (which is the same
    // for all Mach-O binaries on a given architecture)
    int fd = open(argv[0], O_RDONLY);
    uint32_t magic_number = 0;
    read(fd, &magic_number, 4);
    printf("Mach-O Magic Number: %x \n", magic_number);
    close(fd);
}

int main(int argc, char * argv[]) {
    @autoreleasepool {
        // 修改pilist
        modifyThePlistFile(argc, argv);
        
        return UIApplicationMain(argc, argv, nil, @"AppDelegate");
    }
}

• 外部调用看打印

// 获取plist文件 方法1
NSString *cerPath = [[NSBundle mainBundle] pathForResource:@"文件名" ofType:@"plist"];

// 获取plist文件 方法2
NSURL *URL=[[NSBundle mainBundle]URLForResource:@"文件名" withExtension:@"plist"];