mirror of
https://github.com/topjohnwu/Magisk.git
synced 2024-12-25 22:47:37 +00:00
315 lines
8.0 KiB
C++
315 lines
8.0 KiB
C++
#include <fcntl.h>
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#include <pthread.h>
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#include <signal.h>
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#include <libgen.h>
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#include <sys/un.h>
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#include <sys/types.h>
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#include <sys/mount.h>
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#include <android/log.h>
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#include <magisk.hpp>
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#include <utils.hpp>
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#include <daemon.hpp>
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#include <selinux.hpp>
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#include <db.hpp>
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#include <resetprop.hpp>
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#include <flags.hpp>
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#include <stream.hpp>
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using namespace std;
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int SDK_INT = -1;
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bool RECOVERY_MODE = false;
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string MAGISKTMP;
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int DAEMON_STATE = STATE_NONE;
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static struct stat self_st;
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static bool verify_client(pid_t pid) {
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// Verify caller is the same as server
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char path[32];
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sprintf(path, "/proc/%d/exe", pid);
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struct stat st;
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return !(stat(path, &st) || st.st_dev != self_st.st_dev || st.st_ino != self_st.st_ino);
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}
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static void request_handler(int client, int req_code, ucred cred) {
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switch (req_code) {
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case MAGISKHIDE:
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magiskhide_handler(client);
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break;
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case SUPERUSER:
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su_daemon_handler(client, &cred);
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break;
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case POST_FS_DATA:
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post_fs_data(client);
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break;
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case LATE_START:
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late_start(client);
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break;
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case BOOT_COMPLETE:
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boot_complete(client);
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break;
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case SQLITE_CMD:
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exec_sql(client);
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break;
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case REMOVE_MODULES:
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remove_modules();
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write_int(client, 0);
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close(client);
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reboot();
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break;
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default:
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close(client);
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break;
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}
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}
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static void handle_request(int client) {
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int req_code;
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// Verify client credentials
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ucred cred;
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get_client_cred(client, &cred);
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if (cred.uid != 0 && !verify_client(cred.pid))
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goto shortcut;
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req_code = read_int(client);
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if (req_code < 0 || req_code >= DAEMON_CODE_END)
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goto shortcut;
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// Check client permissions
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switch (req_code) {
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case MAGISKHIDE:
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case POST_FS_DATA:
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case LATE_START:
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case BOOT_COMPLETE:
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case SQLITE_CMD:
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case GET_PATH:
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if (cred.uid != 0) {
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write_int(client, ROOT_REQUIRED);
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goto shortcut;
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}
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break;
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case REMOVE_MODULES:
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if (cred.uid != UID_SHELL && cred.uid != UID_ROOT) {
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write_int(client, 1);
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goto shortcut;
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}
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break;
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}
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// Simple requests
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switch (req_code) {
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case CHECK_VERSION:
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write_string(client, MAGISK_VERSION ":MAGISK");
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goto shortcut;
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case CHECK_VERSION_CODE:
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write_int(client, MAGISK_VER_CODE);
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goto shortcut;
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case GET_PATH:
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write_string(client, MAGISKTMP.data());
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goto shortcut;
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case START_DAEMON:
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setup_logfile(true);
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goto shortcut;
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}
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// Create new thread to handle complex requests
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new_daemon_thread([=] { return request_handler(client, req_code, cred); });
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return;
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shortcut:
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close(client);
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}
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static shared_ptr<FILE> log_file;
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atomic_flag file_backed = ATOMIC_FLAG_INIT;
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static char *log_buf;
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static size_t log_buf_len;
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void setup_logfile(bool reset) {
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if (file_backed.test_and_set(memory_order_relaxed))
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return;
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if (reset)
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rename(LOGFILE, LOGFILE ".bak");
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int fd = xopen(LOGFILE, O_WRONLY | O_APPEND | O_CREAT | O_CLOEXEC, 0644);
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if (fd < 0) {
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log_file.reset();
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return;
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}
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// Dump all logs in memory (if exists)
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if (log_buf)
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write(fd, log_buf, log_buf_len);
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if (FILE *fp = fdopen(fd, "a")) {
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setbuf(fp, nullptr);
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log_file.reset(fp, &fclose);
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}
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}
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static int magisk_log(int prio, const char *fmt, va_list ap) {
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va_list args;
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va_copy(args, ap);
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// Log to logcat
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__android_log_vprint(prio, "Magisk", fmt, ap);
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auto local_log_file = log_file;
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if (!local_log_file)
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return 0;
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char buf[4096];
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timeval tv;
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tm tm;
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char type;
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switch (prio) {
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case ANDROID_LOG_DEBUG:
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type = 'D';
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break;
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case ANDROID_LOG_INFO:
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type = 'I';
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break;
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case ANDROID_LOG_WARN:
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type = 'W';
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break;
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default:
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type = 'E';
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break;
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}
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gettimeofday(&tv, nullptr);
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localtime_r(&tv.tv_sec, &tm);
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size_t len = strftime(buf, sizeof(buf), "%m-%d %T", &tm);
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int ms = tv.tv_usec / 1000;
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len += sprintf(buf + len, ".%03d %c : ", ms, type);
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strcpy(buf + len, fmt);
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return vfprintf(local_log_file.get(), buf, args);
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}
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static void android_logging() {
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auto in_mem_file = make_stream_fp<byte_stream>(log_buf, log_buf_len);
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log_file.reset(in_mem_file.release(), [](FILE *) {
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free(log_buf);
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log_buf = nullptr;
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});
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log_cb.d = [](auto fmt, auto ap){ return magisk_log(ANDROID_LOG_DEBUG, fmt, ap); };
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log_cb.i = [](auto fmt, auto ap){ return magisk_log(ANDROID_LOG_INFO, fmt, ap); };
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log_cb.w = [](auto fmt, auto ap){ return magisk_log(ANDROID_LOG_WARN, fmt, ap); };
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log_cb.e = [](auto fmt, auto ap){ return magisk_log(ANDROID_LOG_ERROR, fmt, ap); };
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log_cb.ex = nop_ex;
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}
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static void daemon_entry(int ppid) {
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android_logging();
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int fd = xopen("/dev/null", O_WRONLY);
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xdup2(fd, STDOUT_FILENO);
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xdup2(fd, STDERR_FILENO);
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if (fd > STDERR_FILENO)
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close(fd);
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fd = xopen("/dev/zero", O_RDONLY);
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xdup2(fd, STDIN_FILENO);
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if (fd > STDERR_FILENO)
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close(fd);
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setsid();
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setcon("u:r:" SEPOL_PROC_DOMAIN ":s0");
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LOGI(NAME_WITH_VER(Magisk) " daemon started\n");
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// Make sure ppid is not in acct
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char src[64], dest[64];
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sprintf(src, "/acct/uid_0/pid_%d", ppid);
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sprintf(dest, "/acct/uid_0/pid_%d", getpid());
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rename(src, dest);
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// Get self stat
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xreadlink("/proc/self/exe", src, sizeof(src));
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MAGISKTMP = dirname(src);
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xstat("/proc/self/exe", &self_st);
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// Get API level
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parse_prop_file("/system/build.prop", [](auto key, auto val) -> bool {
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if (key == "ro.build.version.sdk") {
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SDK_INT = parse_int(val);
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return false;
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}
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return true;
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});
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if (SDK_INT < 0) {
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// In case some devices do not store this info in build.prop, fallback to getprop
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auto sdk = getprop("ro.build.version.sdk");
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if (!sdk.empty()) {
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SDK_INT = parse_int(sdk);
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}
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}
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LOGI("* Device API level: %d\n", SDK_INT);
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restore_tmpcon();
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// SAR cleanups
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auto mount_list = MAGISKTMP + "/" ROOTMNT;
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if (access(mount_list.data(), F_OK) == 0) {
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file_readline(true, mount_list.data(), [](string_view line) -> bool {
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umount2(line.data(), MNT_DETACH);
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return true;
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});
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}
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unlink("/dev/.se");
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// Load config status
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auto config = MAGISKTMP + "/" INTLROOT "/config";
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parse_prop_file(config.data(), [](auto key, auto val) -> bool {
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if (key == "RECOVERYMODE" && val == "true")
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RECOVERY_MODE = true;
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return true;
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});
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struct sockaddr_un sun;
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socklen_t len = setup_sockaddr(&sun, MAIN_SOCKET);
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fd = xsocket(AF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0);
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if (xbind(fd, (struct sockaddr*) &sun, len))
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exit(1);
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xlisten(fd, 10);
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// Change process name
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set_nice_name("magiskd");
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// Block all signals
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sigset_t block_set;
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sigfillset(&block_set);
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pthread_sigmask(SIG_SETMASK, &block_set, nullptr);
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// Loop forever to listen for requests
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for (;;) {
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int client = xaccept4(fd, nullptr, nullptr, SOCK_CLOEXEC);
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handle_request(client);
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}
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}
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int connect_daemon(bool create) {
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struct sockaddr_un sun;
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socklen_t len = setup_sockaddr(&sun, MAIN_SOCKET);
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int fd = xsocket(AF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0);
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if (connect(fd, (struct sockaddr*) &sun, len)) {
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if (!create || getuid() != UID_ROOT || getgid() != UID_ROOT) {
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LOGE("No daemon is currently running!\n");
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exit(1);
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}
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int ppid = getpid();
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LOGD("client: launching new main daemon process\n");
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if (fork_dont_care() == 0) {
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close(fd);
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daemon_entry(ppid);
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}
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while (connect(fd, (struct sockaddr*) &sun, len))
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usleep(10000);
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}
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return fd;
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}
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