#include <stdio.h>  
#include <stdlib.h>  
//#include <asm/user.h>
#include <asm/ptrace.h>  
#include <sys/ptrace.h>  
#include <sys/wait.h>  
#include <sys/mman.h>  
#include <dlfcn.h>  
#include <dirent.h>  
#include <unistd.h>  
#include <string.h>  
#include <elf.h>  
#include <android/log.h>
#include <sys/uio.h>

  
#if defined(__i386__)  
#define pt_regs         user_regs_struct  
#elif defined(__aarch64__)
#define pt_regs         user_pt_regs  
#define uregs	regs
#define ARM_pc	pc
#define ARM_sp	sp
#define ARM_cpsr	pstate
#define ARM_lr		regs[30]
#define ARM_r0		regs[0]  
#define PTRACE_GETREGS PTRACE_GETREGSET
#define PTRACE_SETREGS PTRACE_SETREGSET
#endif  
  
#define ENABLE_DEBUG 1  
  
#if ENABLE_DEBUG  
#define  LOG_TAG "INJECT"  
#define  LOGD(fmt, args...)  __android_log_print(ANDROID_LOG_DEBUG,LOG_TAG, fmt, ##args)  
#define DEBUG_PRINT(format,args...) \  
    LOGD(format, ##args)  
#else  
#define DEBUG_PRINT(format,args...)  
#endif  
  
#define CPSR_T_MASK     ( 1u << 5 )  
  
#if defined(__aarch64__)    
const char *libc_path = "/system/lib64/libc.so";    
const char *linker_path = "/system/bin/linker64";    
#else
const char *libc_path = "/system/lib/libc.so";    
const char *linker_path = "/system/bin/linker";    
#endif

int ptrace_setregs(pid_t pid, struct pt_regs * regs)
{
#if defined (__aarch64__)
        int regset = NT_PRSTATUS;
        struct iovec ioVec;

        ioVec.iov_base = regs;
        ioVec.iov_len = sizeof(*regs);
    if (ptrace(PTRACE_SETREGSET, pid, (void*)regset, &ioVec) < 0) {
        perror("ptrace_setregs: Can not get register values");
        return -1;
    }

    return 0;
#else
    if (ptrace(PTRACE_SETREGS, pid, NULL, regs) < 0) {
        perror("ptrace_setregs: Can not set register values");
        return -1;
    }

    return 0;
#endif
}

int ptrace_continue(pid_t pid)
{
    if (ptrace(PTRACE_CONT, pid, NULL, 0) < 0) {
        perror("ptrace_cont");
        return -1;
    }

    return 0;
}

int ptrace_readdata(pid_t pid,  uint8_t *src, uint8_t *buf, size_t size)    
{    
    long i, j, remain;    
    uint8_t *laddr;       
    const size_t bytes_width = sizeof(long);
	
    union u {    
        long val;    
        char chars[bytes_width];    
    } d;    
    
    j = size / bytes_width;    
    remain = size % bytes_width;    
    
    laddr = buf;    
    
    for (i = 0; i < j; i ++) {    
        d.val = ptrace(PTRACE_PEEKTEXT, pid, src, 0);    
        memcpy(laddr, d.chars, bytes_width);    
        src += bytes_width;    
        laddr += bytes_width;    
    }    
    
    if (remain > 0) {    
        d.val = ptrace(PTRACE_PEEKTEXT, pid, src, 0);    
        memcpy(laddr, d.chars, remain);    
    }    
    
    return 0;    
}    
    
int ptrace_writedata(pid_t pid, uint8_t *dest, uint8_t *data, size_t size)    
{    
    long i, j, remain;    
    uint8_t *laddr;    
    const size_t bytes_width = sizeof(long);
	
    union u {    
        long val;    
        char chars[bytes_width];    
    } d;    
    
    j = size / bytes_width;    
    remain = size % bytes_width;    
    
    laddr = data;    
    
    for (i = 0; i < j; i ++) {    
        memcpy(d.chars, laddr, bytes_width);    
        ptrace(PTRACE_POKETEXT, pid, dest, d.val);    
    
        dest  += bytes_width;    
        laddr += bytes_width;    
    }    
    
    if (remain > 0) {    
        d.val = ptrace(PTRACE_PEEKTEXT, pid, dest, 0);    
        for (i = 0; i < remain; i ++) {    
            d.chars[i] = *laddr ++;    
        }    
    
        ptrace(PTRACE_POKETEXT, pid, dest, d.val);   
    }    
    
    return 0;    
}    
    
#if defined(__arm__) || defined(__aarch64__)
int ptrace_call(pid_t pid, uintptr_t addr, long *params, int num_params, struct pt_regs* regs)    
{    
    int i;   
#if defined(__arm__) 
    int num_param_registers = 4;
#elif defined(__aarch64__) 
    int num_param_registers = 8;
#endif

    for (i = 0; i < num_params && i < num_param_registers; i ++) {    
        regs->uregs[i] = params[i];    
    }    
    
    //    
    // push remained params onto stack    
    //    
    if (i < num_params) {    
        regs->ARM_sp -= (num_params - i) * sizeof(long) ;    
        ptrace_writedata(pid, (uint8_t *)regs->ARM_sp, (uint8_t *)¶ms[i], (num_params - i) * sizeof(long));
    }    
    
    regs->ARM_pc = addr;    
    if (regs->ARM_pc & 1) {    
        /* thumb */    
        regs->ARM_pc &= (~1u);    
        regs->ARM_cpsr |= CPSR_T_MASK;    
    } else {    
        /* arm */    
        regs->ARM_cpsr &= ~CPSR_T_MASK;    
    }    
    
    regs->ARM_lr = 0;        
    
    if (ptrace_setregs(pid, regs) == -1     
            || ptrace_continue(pid) == -1) {    
        printf("error\n");    
        return -1;    
    }    
    
    int stat = 0;  
    waitpid(pid, &stat, WUNTRACED);  
    while (stat != 0xb7f) {  
        if (ptrace_continue(pid) == -1) {  
            printf("error\n");  
            return -1;  
        }  
        waitpid(pid, &stat, WUNTRACED);  
    }  
    
    return 0;    
}    

#elif defined(__i386__)    
long ptrace_call(pid_t pid, uintptr_t addr, long *params, int num_params, struct user_regs_struct * regs)    
{    
    regs->esp -= (num_params) * sizeof(long) ;    
    ptrace_writedata(pid, (void *)regs->esp, (uint8_t *)params, (num_params) * sizeof(long));    
    
    long tmp_addr = 0x00;    
    regs->esp -= sizeof(long);    
    ptrace_writedata(pid, regs->esp, (char *)&tmp_addr, sizeof(tmp_addr));     
    
    regs->eip = addr;    
    
    if (ptrace_setregs(pid, regs) == -1     
            || ptrace_continue( pid) == -1) {    
        printf("error\n");    
        return -1;    
    }    
    
    int stat = 0;  
    waitpid(pid, &stat, WUNTRACED);  
    while (stat != 0xb7f) {  
        if (ptrace_continue(pid) == -1) {  
            printf("error\n");  
            return -1;  
        }  
        waitpid(pid, &stat, WUNTRACED);  
    }  
    
    return 0;    
}    
#else     
#error "Not supported"    
#endif    
    
int ptrace_getregs(pid_t pid, struct pt_regs * regs)    
{    
#if defined (__aarch64__)
		int regset = NT_PRSTATUS;
		struct iovec ioVec;
		
		ioVec.iov_base = regs;
		ioVec.iov_len = sizeof(*regs);
    if (ptrace(PTRACE_GETREGSET, pid, (void*)regset, &ioVec) < 0) {    
        perror("ptrace_getregs: Can not get register values");   
        printf(" io %llx, %d", ioVec.iov_base, ioVec.iov_len); 
        return -1;    
    }    
    
    return 0;   
#else
    if (ptrace(PTRACE_GETREGS, pid, NULL, regs) < 0) {    
        perror("ptrace_getregs: Can not get register values");    
        return -1;    
    }    
    
    return 0;   
#endif     
}    

int ptrace_attach(pid_t pid)    
{    
    if (ptrace(PTRACE_ATTACH, pid, NULL, 0) < 0) {    
        perror("ptrace_attach");    
        return -1;    
    }    
    
    int status = 0;    
    waitpid(pid, &status , WUNTRACED);    
    
    return 0;    
}    
    
int ptrace_detach(pid_t pid)    
{    
    if (ptrace(PTRACE_DETACH, pid, NULL, 0) < 0) {    
        perror("ptrace_detach");    
        return -1;    
    }    
    
    return 0;    
}    
    
void* get_module_base(pid_t pid, const char* module_name)    
{    
    FILE *fp;    
    long addr = 0;    
    char *pch;    
    char filename[32];    
    char line[1024];    
    
    if (pid < 0) {    
        /* self process */    
        snprintf(filename, sizeof(filename), "/proc/self/maps", pid);    
    } else {    
        snprintf(filename, sizeof(filename), "/proc/%d/maps", pid);    
    }    
    
    fp = fopen(filename, "r");    
    
    if (fp != NULL) {    
        while (fgets(line, sizeof(line), fp)) {    
            if (strstr(line, module_name)) {    
                pch = strtok( line, "-" );    
                addr = strtoull( pch, NULL, 16 );   
    
                if (addr == 0x8000)    
                    addr = 0;    
    
                break;    
            }    
        }    
    
        fclose(fp) ;    
    }    
    
    return (void *)addr;    
}    
    
void* get_remote_addr(pid_t target_pid, const char* module_name, void* local_addr)
{    
    void* local_handle, *remote_handle;    
    
    local_handle = get_module_base(-1, module_name);    
    remote_handle = get_module_base(target_pid, module_name);    
    
    DEBUG_PRINT("[+] get_remote_addr: local[%llx], remote[%llx]\n", local_handle, remote_handle);    
    
    void * ret_addr = (void *)((uintptr_t)local_addr + (uintptr_t)remote_handle - (uintptr_t)local_handle);    
    
#if defined(__i386__)    
    if (!strcmp(module_name, libc_path)) {    
        ret_addr += 2;    
    }    
#endif    
    return ret_addr;    
}    
    
int find_pid_of(const char *process_name)    
{    
    int id;    
    pid_t pid = -1;    
    DIR* dir;    
    FILE *fp;    
    char filename[32];    
    char cmdline[256];    
    
    struct dirent * entry;    
    
    if (process_name == NULL)    
        return -1;    
    
    dir = opendir("/proc");    
    if (dir == NULL)    
        return -1;    
    
    while((entry = readdir(dir)) != NULL) {    
        id = atoi(entry->d_name);    
        if (id != 0) {    
            sprintf(filename, "/proc/%d/cmdline", id);    
            fp = fopen(filename, "r");    
            if (fp) {    
                fgets(cmdline, sizeof(cmdline), fp);    
                fclose(fp);    
    
                if (strcmp(process_name, cmdline) == 0) {    
                    /* process found */    
                    pid = id;    
                    break;    
                }    
            }    
        }    
    }    
    
    closedir(dir);    
    return pid;    
}    
    
uint64_t ptrace_retval(struct pt_regs * regs)    
{    
#if defined(__arm__) || defined(__aarch64__)
    return regs->ARM_r0;    
#elif defined(__i386__)    
    return regs->eax;    
#else    
#error "Not supported"    
#endif    
}    
    
uint64_t ptrace_ip(struct pt_regs * regs)    
{    
#if defined(__arm__) || defined(__aarch64__) 
    return regs->ARM_pc;   
#elif defined(__i386__)    
    return regs->eip;    
#else    
#error "Not supported"    
#endif    
}    
    
int ptrace_call_wrapper(pid_t target_pid, const char * func_name, void * func_addr, long * parameters, int param_num, struct pt_regs * regs)
{    
    DEBUG_PRINT("[+] Calling %s in target process.\n", func_name);    
    if (ptrace_call(target_pid, (uintptr_t)func_addr, parameters, param_num, regs) == -1)    
        return -1;    
    
    if (ptrace_getregs(target_pid, regs) == -1)    
        return -1;    
    DEBUG_PRINT("[+] Target process returned from %s, return value=%llx, pc=%llx \n",     
            func_name, ptrace_retval(regs), ptrace_ip(regs));    
    return 0;    
}    
    
int inject_remote_process(pid_t target_pid, const char *library_path, const char *function_name, const char *param, size_t param_size)    
{    
    int ret = -1;    
    void *mmap_addr, *dlopen_addr, *dlsym_addr, *dlclose_addr, *dlerror_addr;    
    void *local_handle, *remote_handle, *dlhandle;    
    uint8_t *map_base = 0;
    uint8_t *dlopen_param1_ptr, *dlsym_param2_ptr, *saved_r0_pc_ptr, *inject_param_ptr, *remote_code_ptr, *local_code_ptr;    
    
    struct pt_regs regs, original_regs;     
    long parameters[10];    
    
DEBUG_PRINT("[+] 111111111111111111Injecting process: %d\n", target_pid);    
    
    if (ptrace_attach(target_pid) == -1){    
		DEBUG_PRINT("222222222\n");
        goto exit; 
	}   
    
    if (ptrace_getregs(target_pid, ®s) == -1){    
		DEBUG_PRINT("3333333333333333\n");
        goto exit;
	}    
    
    /* save original registers */    
    memcpy(&original_regs, ®s, sizeof(regs));    
    
    mmap_addr = get_remote_addr(target_pid, libc_path, (void *)mmap);
    DEBUG_PRINT("[+] pid:%d  Remote mmap address: %llx\n", target_pid, mmap_addr);
    
    /* call mmap */    
    parameters[0] = 0;  // addr    
    parameters[1] = 0x4000; // size    
    parameters[2] = PROT_READ | PROT_WRITE | PROT_EXEC;  // prot    
    parameters[3] = MAP_ANONYMOUS | MAP_PRIVATE; // flags    
    parameters[4] = 0; //fd    
    parameters[5] = 0; //offset    
    
    if (ptrace_call_wrapper(target_pid, "mmap", mmap_addr, parameters, 6, ®s) == -1){    
		DEBUG_PRINT("444444444444444444444\n");
        goto exit;    
	}
    
    map_base = (uint8_t*)ptrace_retval(®s);
    
    dlopen_addr = get_remote_addr( target_pid, linker_path, (void *)dlopen );    
    dlsym_addr = get_remote_addr( target_pid, linker_path, (void *)dlsym );    
    dlclose_addr = get_remote_addr( target_pid, linker_path, (void *)dlclose );    
    dlerror_addr = get_remote_addr( target_pid, linker_path, (void *)dlerror );    
    
    DEBUG_PRINT("[+] Get imports: dlopen: %llx, dlsym: %llx, dlclose: %llx, dlerror: %llx\n",    
            dlopen_addr, dlsym_addr, dlclose_addr, dlerror_addr);    
    
    printf("library path = %s\n", library_path);    
    ptrace_writedata(target_pid, map_base, (uint8_t*)library_path, strlen(library_path) + 1);
        
    parameters[0] = (long)map_base;
    parameters[1] = RTLD_NOW| RTLD_GLOBAL;

    void * sohandle;
    void * hook_entry_addr;
    
    if (ptrace_call_wrapper(target_pid, "dlopen", dlopen_addr, parameters, 2, ®s) == -1){    
        DEBUG_PRINT("5555555555555555555555\n");
        goto exit;
	}
    
    sohandle = (void*)ptrace_retval(®s);
    if(!sohandle) {
    		if (ptrace_call_wrapper(target_pid, "dlerror", dlerror_addr, 0, 0, ®s) == -1)    
      	  goto exit;    
        
    		uint8_t *errret = (uint8_t*)ptrace_retval(®s);
    		uint8_t errbuf[100];
    		ptrace_readdata(target_pid, errret, errbuf, 100);
  	}
    
    
#define FUNCTION_NAME_ADDR_OFFSET       0x100    
    ptrace_writedata(target_pid, map_base + FUNCTION_NAME_ADDR_OFFSET, (uint8_t*)function_name, strlen(function_name) + 1);
    parameters[0] = (long)sohandle;
    parameters[1] = (long)(map_base + FUNCTION_NAME_ADDR_OFFSET);
    
    if (ptrace_call_wrapper(target_pid, "dlsym", dlsym_addr, parameters, 2, ®s) == -1){    
		DEBUG_PRINT("666666666666666666666\n");
        goto exit;    
	}
    
    hook_entry_addr = (void *)ptrace_retval(®s);
    DEBUG_PRINT("hook_entry_addr = %p\n", hook_entry_addr);    
    
#define FUNCTION_PARAM_ADDR_OFFSET      0x200    
    ptrace_writedata(target_pid, map_base + FUNCTION_PARAM_ADDR_OFFSET, (uint8_t*)param, strlen(param) + 1);
    parameters[0] = (long)(map_base + FUNCTION_PARAM_ADDR_OFFSET);
  
    if (ptrace_call_wrapper(target_pid, "hook_entry", hook_entry_addr, parameters, 1, ®s) == -1){    
		DEBUG_PRINT("7777777777777777777\n");
        goto exit;
	}        
    
    printf("Press enter to dlclose and detach\n");    
    getchar();    
    parameters[0] = (long)sohandle;
    
    if (ptrace_call_wrapper(target_pid, "dlclose", (void*)dlclose, parameters, 1, ®s) == -1){
		DEBUG_PRINT("8888888888888888888888888888\n");
        goto exit;
	}    
    
    /* restore */    
    ptrace_setregs(target_pid, &original_regs);    
    ptrace_detach(target_pid);    
    ret = 0;    
    
exit:    
    return ret;    
}    
    
int main(int argc, char** argv) {    
    pid_t target_pid;    
    target_pid = find_pid_of("/system/bin/surfaceflinger");
    if (-1 == target_pid) {  
        printf("Can't find the process\n");  
        return -1;  
    }  
    //target_pid = find_pid_of("/data/test");    
    inject_remote_process(target_pid, "/data/libhello-jni.so", "hook_entry",  "I'm parameter!", strlen("I'm parameter!"));
    return 0;  
}    

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