187 lines
3.9 KiB
C
187 lines
3.9 KiB
C
/* daemon.c - Magisk Daemon
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*
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* Start the daemon and wait for requests
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* Connect the daemon and send requests through sockets
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*/
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <string.h>
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#include <errno.h>
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#include <pthread.h>
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#include <signal.h>
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#include <sys/un.h>
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#include <sys/types.h>
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#include <selinux/selinux.h>
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#include "magisk.h"
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#include "utils.h"
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#include "daemon.h"
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#include "magiskpolicy.h"
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#include "resetprop.h"
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pthread_t sepol_patch;
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int is_restart = 0;
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static void *request_handler(void *args) {
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int client = *((int *) args);
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free(args);
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client_request req = read_int(client);
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struct ucred credentials;
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get_client_cred(client, &credentials);
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switch (req) {
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case LAUNCH_MAGISKHIDE:
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case STOP_MAGISKHIDE:
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case ADD_HIDELIST:
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case RM_HIDELIST:
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case LS_HIDELIST:
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case POST_FS:
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case POST_FS_DATA:
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case LATE_START:
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if (credentials.uid != 0) {
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write_int(client, ROOT_REQUIRED);
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close(client);
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return NULL;
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}
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default:
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break;
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}
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switch (req) {
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case LAUNCH_MAGISKHIDE:
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launch_magiskhide(client);
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break;
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case STOP_MAGISKHIDE:
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stop_magiskhide(client);
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break;
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case ADD_HIDELIST:
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add_hide_list(client);
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break;
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case RM_HIDELIST:
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rm_hide_list(client);
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break;
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case LS_HIDELIST:
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ls_hide_list(client);
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break;
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case SUPERUSER:
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su_daemon_receiver(client);
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break;
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case CHECK_VERSION:
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write_string(client, MAGISK_VER_STR);
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close(client);
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break;
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case CHECK_VERSION_CODE:
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write_int(client, MAGISK_VER_CODE);
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close(client);
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break;
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case POST_FS:
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post_fs(client);
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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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default:
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break;
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}
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return NULL;
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}
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static void *start_magisk_hide(void *args) {
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launch_magiskhide(-1);
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return NULL;
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}
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void auto_start_magiskhide() {
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char *hide_prop = getprop2(MAGISKHIDE_PROP, 1);
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if (hide_prop == NULL || strcmp(hide_prop, "0") != 0) {
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pthread_t thread;
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xpthread_create(&thread, NULL, start_magisk_hide, NULL);
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pthread_detach(thread);
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}
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free(hide_prop);
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}
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void start_daemon() {
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setsid();
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setcon("u:r:su:s0");
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umask(0);
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int fd = xopen("/dev/null", O_RDWR | O_CLOEXEC);
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xdup2(fd, STDIN_FILENO);
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xdup2(fd, STDOUT_FILENO);
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xdup2(fd, STDERR_FILENO);
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close(fd);
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// Block user signals
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sigset_t block_set;
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sigemptyset(&block_set);
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sigaddset(&block_set, SIGUSR1);
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sigaddset(&block_set, SIGUSR2);
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pthread_sigmask(SIG_SETMASK, &block_set, NULL);
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struct sockaddr_un sun;
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fd = setup_socket(&sun);
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if (xbind(fd, (struct sockaddr*) &sun, sizeof(sun)))
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exit(1);
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xlisten(fd, 10);
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if ((is_restart = access(MAGISKTMP, F_OK) == 0)) {
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// Restart stuffs if the daemon is restarted
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exec_command_sync("logcat", "-b", "all", "-c", NULL);
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auto_start_magiskhide();
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start_debug_log();
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}
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// Start the log monitor
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monitor_logs();
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LOGI("Magisk v" xstr(MAGISK_VERSION) "(" xstr(MAGISK_VER_CODE) ") daemon started\n");
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// Change process name
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strcpy(argv0, "magisk_daemon");
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// Unlock all blocks for rw
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unlock_blocks();
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// Loop forever to listen for requests
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while(1) {
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int *client = xmalloc(sizeof(int));
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*client = xaccept4(fd, NULL, NULL, SOCK_CLOEXEC);
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pthread_t thread;
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xpthread_create(&thread, NULL, request_handler, client);
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// Detach the thread, we will never join it
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pthread_detach(thread);
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}
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}
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/* Connect the daemon, and return a socketfd */
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int connect_daemon() {
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struct sockaddr_un sun;
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int fd = setup_socket(&sun);
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if (connect(fd, (struct sockaddr*) &sun, sizeof(sun))) {
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// If we cannot access the daemon, we start a daemon in the child process if possible
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if (getuid() != UID_ROOT || getgid() != UID_ROOT) {
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fprintf(stderr, "No daemon is currently running!\n");
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exit(1);
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}
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if (xfork() == 0) {
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LOGD("client: connect fail, try launching new daemon process\n");
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close(fd);
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start_daemon();
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}
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while (connect(fd, (struct sockaddr*) &sun, sizeof(sun)))
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usleep(10000);
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}
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return fd;
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}
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