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| #import <dlfcn.h>
#import <UIKit/UIKit.h>
#import "AppDelegate.h"
#import "fishhook.h"
static int (*orig_close)(int);
static int (*orig_open)(const charchar *, int, ...);
void save_original_symbols() {
orig_close = dlsym(RTLD_DEFAULT, "close");
orig_open = dlsym(RTLD_DEFAULT, "open");
}
int my_close(int fd) {
printf("Calling real close(%d)\n", fd);
return orig_close(fd);
}
int my_open(const charchar *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);
return orig_open(path, oflag, mode);
}
}
int main(int argc, charchar * argv[])
{
@autoreleasepool {
save_original_symbols();
//fishhook用法
rebind_symbols((struct rebinding[2]){
{"close", my_close},
{"open", my_open}}, 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);
return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
}
}
|
