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292 lines
9.3 KiB
C++
292 lines
9.3 KiB
C++
// injector.cpp – 改进版 Android ptrace 注入器 (arm64)
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// 编译: arm64-linux-android-clang++ -static -std=c++17 injector.cpp -o injector
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// 用法:
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// ./injector [so_path] [package_name] // 自动查找进程
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// ./injector [so_path] [pid] // 直接指定 PID（第三个参数为数字）
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// 示例:
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// ./injector /data/local/tmp/libcheat.so com.tencent.jkchess
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// ./injector /data/local/tmp/libcheat.so 12345
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/ptrace.h>
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#include <sys/uio.h>
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#include <sys/wait.h>
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#include <sys/mman.h>
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#include <sys/user.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <dirent.h>
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#include <dlfcn.h>
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#include <errno.h>
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#include <linux/elf.h>
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#include <asm/ptrace.h>
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#include <ctype.h>
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#include <string>
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#include <vector>
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#include <algorithm>
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// ---------- 通过 cmdline 精确查找进程 ----------
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int find_pid_by_name(const char* proc_name) {
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DIR* dir = opendir("/proc");
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if (!dir) return -1;
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struct dirent* entry;
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int pid = -1;
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while ((entry = readdir(dir)) != nullptr) {
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if (entry->d_type != DT_DIR) continue;
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int tmp_pid = atoi(entry->d_name);
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if (tmp_pid <= 0) continue;
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char cmdline_path[256];
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snprintf(cmdline_path, sizeof(cmdline_path), "/proc/%d/cmdline", tmp_pid);
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FILE* fp = fopen(cmdline_path, "r");
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if (fp) {
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char cmdline[256] = {0};
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size_t n = fread(cmdline, 1, sizeof(cmdline) - 1, fp);
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fclose(fp);
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if (n > 0) {
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// cmdline 的第一个字符串是命令（包含路径）
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char* pkg = cmdline;
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// 去除路径前缀
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char* last_slash = strrchr(pkg, '/');
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if (last_slash) pkg = last_slash + 1;
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// 比较完整包名
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if (strcmp(pkg, proc_name) == 0) {
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pid = tmp_pid;
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break;
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}
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}
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}
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}
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closedir(dir);
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return pid;
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}
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// ---------- 远程内存读写辅助 ----------
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long ptrace_readdata(int pid, unsigned long addr, void* buffer, size_t size) {
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for (size_t i = 0; i < size; i += sizeof(long)) {
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long data = ptrace(PTRACE_PEEKDATA, pid, addr + i, 0);
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if (data == -1 && errno) return -1;
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memcpy((char*)buffer + i, &data, std::min(sizeof(long), size - i));
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}
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return 0;
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}
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long ptrace_writedata(int pid, unsigned long addr, const void* buffer, size_t size) {
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for (size_t i = 0; i < size; i += sizeof(long)) {
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long data = 0;
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memcpy(&data, (char*)buffer + i, std::min(sizeof(long), size - i));
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if (ptrace(PTRACE_POKEDATA, pid, addr + i, data) == -1)
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return -1;
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}
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return 0;
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}
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// ---------- 注入主逻辑 ----------
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int ptrace_inject(int pid, const char* so_path) {
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// 1. 附加进程
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if (ptrace(PTRACE_ATTACH, pid, 0, 0) == -1) {
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perror("ptrace attach");
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return -1;
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}
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int status;
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waitpid(pid, &status, 0);
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if (!WIFSTOPPED(status)) {
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fprintf(stderr, "process not stopped\n");
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ptrace(PTRACE_DETACH, pid, 0, 0);
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return -1;
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}
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// 2. 保存原始寄存器
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struct user_pt_regs regs, orig_regs;
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struct iovec iov = { ®s, sizeof(regs) };
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if (ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &iov) == -1) {
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perror("ptrace getregset");
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ptrace(PTRACE_DETACH, pid, 0, 0);
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return -1;
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}
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orig_regs = regs;
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// 3. 在远程进程中分配内存存放 SO 路径
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size_t path_len = strlen(so_path) + 1;
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regs.regs[0] = 0;
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regs.regs[1] = path_len;
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regs.regs[2] = PROT_READ | PROT_WRITE;
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regs.regs[3] = MAP_PRIVATE | MAP_ANONYMOUS;
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regs.regs[4] = -1;
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regs.regs[5] = 0;
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regs.regs[8] = 222; // mmap syscall
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iov.iov_base = ®s; iov.iov_len = sizeof(regs);
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if (ptrace(PTRACE_SETREGSET, pid, NT_PRSTATUS, &iov) == -1) {
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perror("ptrace setregset for mmap");
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ptrace(PTRACE_DETACH, pid, 0, 0);
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return -1;
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}
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if (ptrace(PTRACE_SYSCALL, pid, 0, 0) == -1) {
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perror("ptrace syscall");
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ptrace(PTRACE_DETACH, pid, 0, 0);
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return -1;
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}
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waitpid(pid, &status, 0);
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if (!WIFSTOPPED(status)) {
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fprintf(stderr, "process not stopped after syscall\n");
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ptrace(PTRACE_DETACH, pid, 0, 0);
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return -1;
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}
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struct user_pt_regs ret_regs;
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iov.iov_base = &ret_regs; iov.iov_len = sizeof(ret_regs);
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if (ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &iov) == -1) {
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perror("ptrace getregset after mmap");
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ptrace(PTRACE_DETACH, pid, 0, 0);
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return -1;
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}
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long remote_addr = ret_regs.regs[0];
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if (remote_addr <= 0) {
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fprintf(stderr, "mmap failed, remote_addr=0x%lx\n", remote_addr);
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ptrace(PTRACE_DETACH, pid, 0, 0);
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return -1;
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}
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printf("Allocated remote memory at 0x%lx\n", remote_addr);
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// 4. 写入 SO 路径
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if (ptrace_writedata(pid, remote_addr, so_path, path_len) == -1) {
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perror("ptrace writedata");
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ptrace(PTRACE_DETACH, pid, 0, 0);
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return -1;
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}
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// 5. 获取远程 dlopen 地址
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void* local_dlopen = (void*)dlopen;
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FILE* maps = fopen("/proc/self/maps", "r");
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if (!maps) {
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perror("fopen self maps");
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ptrace(PTRACE_DETACH, pid, 0, 0);
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return -1;
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}
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unsigned long local_libdl_base = 0;
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char line[512];
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while (fgets(line, sizeof(line), maps)) {
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if (strstr(line, "libdl.so")) {
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sscanf(line, "%lx", &local_libdl_base);
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break;
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}
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}
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fclose(maps);
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if (local_libdl_base == 0) {
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fprintf(stderr, "cannot find local libdl.so base\n");
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ptrace(PTRACE_DETACH, pid, 0, 0);
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return -1;
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}
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unsigned long local_dlopen_offset = (unsigned long)local_dlopen - local_libdl_base;
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char remote_maps_path[64];
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snprintf(remote_maps_path, sizeof(remote_maps_path), "/proc/%d/maps", pid);
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maps = fopen(remote_maps_path, "r");
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if (!maps) {
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perror("fopen remote maps");
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ptrace(PTRACE_DETACH, pid, 0, 0);
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return -1;
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}
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unsigned long remote_libdl_base = 0;
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while (fgets(line, sizeof(line), maps)) {
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if (strstr(line, "libdl.so")) {
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sscanf(line, "%lx", &remote_libdl_base);
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break;
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}
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}
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fclose(maps);
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if (remote_libdl_base == 0) {
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fprintf(stderr, "cannot find remote libdl.so base\n");
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ptrace(PTRACE_DETACH, pid, 0, 0);
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return -1;
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}
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unsigned long remote_dlopen_addr = remote_libdl_base + local_dlopen_offset;
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printf("Remote dlopen address: 0x%lx\n", remote_dlopen_addr);
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// 6. 调用远程 dlopen
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regs = orig_regs;
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regs.regs[0] = remote_addr;
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regs.regs[1] = RTLD_LAZY;
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regs.pc = remote_dlopen_addr;
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regs.regs[30] = 0x0; // LR = 0，执行后崩溃以便我们捕获
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iov.iov_base = ®s; iov.iov_len = sizeof(regs);
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if (ptrace(PTRACE_SETREGSET, pid, NT_PRSTATUS, &iov) == -1) {
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perror("ptrace setregset for dlopen");
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ptrace(PTRACE_DETACH, pid, 0, 0);
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return -1;
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}
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if (ptrace(PTRACE_CONT, pid, 0, 0) == -1) {
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perror("ptrace cont");
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ptrace(PTRACE_DETACH, pid, 0, 0);
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return -1;
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}
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waitpid(pid, &status, 0);
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if (WIFSIGNALED(status) && WTERMSIG(status) == SIGSEGV) {
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printf("dlopen executed (segfault expected)\n");
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} else {
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fprintf(stderr, "unexpected stop: status=%d\n", status);
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ptrace(PTRACE_DETACH, pid, 0, 0);
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return -1;
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}
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// 7. 恢复寄存器并 detach
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iov.iov_base = &orig_regs; iov.iov_len = sizeof(orig_regs);
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if (ptrace(PTRACE_SETREGSET, pid, NT_PRSTATUS, &iov) == -1) {
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perror("restore regs");
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}
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if (ptrace(PTRACE_DETACH, pid, 0, 0) == -1) {
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perror("detach");
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return -1;
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}
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printf("Injection successful!\n");
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return 0;
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}
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// ---------- 主函数 ----------
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int main(int argc, char** argv) {
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const char* so_path = "/data/local/tmp/libcheat.so"; // 默认路径
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const char* target = "com.tencent.jkchess"; // 默认包名
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int pid = -1;
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if (argc >= 2) so_path = argv[1];
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if (argc >= 3) {
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// 检查第三个参数是否为纯数字（PID）
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bool is_number = true;
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for (int i = 0; argv[2][i]; i++) {
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if (!isdigit(argv[2][i])) { is_number = false; break; }
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}
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if (is_number) {
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pid = atoi(argv[2]);
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printf("Using specified PID: %d\n", pid);
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} else {
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target = argv[2];
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}
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}
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if (argc >= 4) {
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// 如果第四个参数存在，则作为 PID（覆盖之前的推断）
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pid = atoi(argv[3]);
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printf("Using specified PID (from arg4): %d\n", pid);
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}
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if (pid <= 0) {
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printf("Searching for process '%s' ...\n", target);
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pid = find_pid_by_name(target);
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if (pid <= 0) {
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fprintf(stderr, "Process '%s' not found. Please ensure the game is running.\n", target);
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fprintf(stderr, "You can also specify PID manually: %s <so_path> <pid>\n", argv[0]);
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return 1;
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}
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printf("Found PID: %d\n", pid);
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}
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// 检查 SO 文件是否存在
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if (access(so_path, F_OK) == -1) {
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fprintf(stderr, "SO file '%s' does not exist\n", so_path);
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return 1;
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}
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return ptrace_inject(pid, so_path);
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}
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