#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/ptrace.h>
#include <sys/wait.h>
#include <sys/user.h>
#include <dirent.h>
#include <dlfcn.h>
#include <sys/uio.h>
#include <elf.h>

#ifndef NT_PRSTATUS
#define NT_PRSTATUS 1
#endif

// 目标包名
const char* TARGET_PKG = "com.tencent.tmgp.sgame"; 
// 注入库路径
const char* LIB_PATH = "/data/1/libJKMenu.so";

// 更加强力的模块基址获取函数
uintptr_t get_module_base(pid_t pid, const char* module_name) {
    FILE* fp;
    uintptr_t addr = 0;
    char filename[64];
    char line[1024];
    snprintf(filename, sizeof(filename), "/proc/%d/maps", pid);
    fp = fopen(filename, "r");
    if (fp) {
        while (fgets(line, sizeof(line), fp)) {
            // 只要包含 linker 关键字且是该段的起始地址（通常第一条是基址）
            if (strstr(line, module_name)) {
                addr = strtoull(line, NULL, 16);
                // 打印调试信息，看看实际匹配到了什么
                if (pid == getpid()) {
                    printf("[DEBUG] Local Map Match: %s", line);
                }
                break;
            }
        }
        fclose(fp);
    }
    return addr;
}

// 寻找 dlopen 地址的核心逻辑
uintptr_t get_remote_dlopen(pid_t pid) {
    uintptr_t local_linker = 0;
    uintptr_t remote_linker = 0;

    // 扩大搜索范围，尝试匹配各种可能的 linker 名称
    const char* linker_keywords[] = {
        "linker64",
        "linker",
        "com.android.runtime" // 适配某些 APEX 路径
    };

    for (int i = 0; i < 3; i++) {
        local_linker = get_module_base(getpid(), linker_keywords[i]);
        remote_linker = get_module_base(pid, linker_keywords[i]);
        if (local_linker && remote_linker) {
            printf("[+] Linked found via keyword: %s\n", linker_keywords[i]);
            break;
        }
    }

    if (!local_linker || !remote_linker) {
        printf("[-] Error: Local Linker Base: %lx, Remote Linker Base: %lx\n", (long)local_linker, (long)remote_linker);
        return 0;
    }

    // 获取本地 __loader_dlopen 地址
    void* local_func = dlsym(RTLD_DEFAULT, "__loader_dlopen");
    if (!local_func) {
        local_func = dlsym(RTLD_DEFAULT, "dlopen");
    }
    
    // 终极保底：直接使用本地 dlopen 函数指针
    if (!local_func) {
        local_func = (void*)dlopen;
    }

    uintptr_t offset = (uintptr_t)local_func - local_linker;
    uintptr_t remote_addr = remote_linker + offset;

    printf("[+] Local Linker Base: %lx\n", (long)local_linker);
    printf("[+] Remote Linker Base: %lx\n", (long)remote_linker);
    printf("[+] Function Offset: %lx, Remote Addr: %lx\n", (long)offset, (long)remote_addr);

    return remote_addr;
}

pid_t find_pid(const char* pkg) {
    DIR* dir = opendir("/proc");
    if (!dir) return -1;
    struct dirent* entry;
    while ((entry = readdir(dir))) {
        pid_t pid = atoi(entry->d_name);
        if (pid <= 0) continue;
        char path[256], cmd[256];
        snprintf(path, sizeof(path), "/proc/%d/cmdline", pid);
        FILE* f = fopen(path, "r");
        if (f) {
            if (fgets(cmd, sizeof(cmd), f) && strstr(cmd, pkg)) {
                fclose(f); closedir(dir); return pid;
            }
            fclose(f);
        }
    }
    closedir(dir); return -1;
}

int main() {
    printf("[*] JKMenu Injector Starting...\n");
    pid_t pid = find_pid(TARGET_PKG);
    if (pid == -1) { 
        printf("[-] Target process %s not found!\n", TARGET_PKG); 
        return 1; 
    }
    printf("[+] Found Target PID: %d\n", pid);

    uintptr_t dlopen_addr = get_remote_dlopen(pid);
    if (!dlopen_addr) {
        printf("[-] Critical: Failed to calculate dlopen address!\n");
        return 1;
    }

    // --- Ptrace 注入 ---
    if (ptrace(PTRACE_ATTACH, pid, NULL, NULL) < 0) {
        perror("[-] Attach failed");
        return 1;
    }
    waitpid(pid, NULL, WUNTRACED);

    struct user_pt_regs regs;
    struct iovec iov = { .iov_base = &regs, .iov_len = sizeof(regs) };
    ptrace(PTRACE_GETREGSET, pid, (void*)(uintptr_t)NT_PRSTATUS, &iov);

    uintptr_t sp = (regs.sp - 512) & ~0xF;
    size_t len = strlen(LIB_PATH) + 1;
    for (size_t i = 0; i < len; i += 8) {
        long data = 0;
        memcpy(&data, LIB_PATH + i, (len - i) < 8 ? (len - i) : 8);
        ptrace(PTRACE_POKETEXT, pid, (void*)(sp + i), (void*)data);
    }

    regs.regs[0] = sp;       
    regs.regs[1] = 2;        
    regs.pc = dlopen_addr;   
    regs.regs[30] = 0;       

    ptrace(PTRACE_SETREGSET, pid, (void*)(uintptr_t)NT_PRSTATUS, &iov);
    printf("[*] Triggering remote load...\n");
    ptrace(PTRACE_CONT, pid, NULL, NULL);
    
    usleep(500000); 
    ptrace(PTRACE_DETACH, pid, NULL, NULL);
    printf("[+] Injection Done.\n");

    return 0;
}