Magisk/native/jni/core/daemon.c

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/* daemon.c - Magisk Daemon
*
* Start the daemon and wait for requests
* Connect the daemon and send requests through sockets
*/
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <pthread.h>
#include <signal.h>
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#include <sys/un.h>
#include <sys/types.h>
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#include <sys/mount.h>
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#include <selinux/selinux.h>
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#include "magisk.h"
#include "utils.h"
#include "daemon.h"
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#include "resetprop.h"
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#include "magiskpolicy.h"
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int seperate_vendor = 0;
int full_patch_pid;
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static void *request_handler(void *args) {
int client = *((int *) args);
free(args);
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int req = read_int(client);
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struct ucred credential;
get_client_cred(client, &credential);
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switch (req) {
case LAUNCH_MAGISKHIDE:
case STOP_MAGISKHIDE:
case ADD_HIDELIST:
case RM_HIDELIST:
case LS_HIDELIST:
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case POST_FS_DATA:
case LATE_START:
if (credential.uid != 0) {
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write_int(client, ROOT_REQUIRED);
close(client);
return NULL;
}
default:
break;
}
switch (req) {
case LAUNCH_MAGISKHIDE:
launch_magiskhide(client);
break;
case STOP_MAGISKHIDE:
stop_magiskhide(client);
break;
case ADD_HIDELIST:
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add_hide_list(client);
break;
case RM_HIDELIST:
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rm_hide_list(client);
break;
case LS_HIDELIST:
ls_hide_list(client);
break;
case SUPERUSER:
su_daemon_receiver(client, &credential);
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break;
case CHECK_VERSION:
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write_string(client, MAGISK_VER_STR);
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close(client);
break;
case CHECK_VERSION_CODE:
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write_int(client, MAGISK_VER_CODE);
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close(client);
break;
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case POST_FS_DATA:
post_fs_data(client);
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break;
case LATE_START:
late_start(client);
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break;
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default:
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break;
}
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return NULL;
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}
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static void *start_magisk_hide(void *args) {
launch_magiskhide(-1);
return NULL;
}
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static void daemon_saver() {
int fd, val;
struct sockaddr_un sun;
// Change process name
strcpy(argv0, "magisk_saver");
while (1) {
fd = setup_socket(&sun);
while(connect(fd, (struct sockaddr*) &sun, sizeof(sun)))
usleep(10000);
write_int(fd, DO_NOTHING);
// Should hold forever unless the other side is closed
read(fd, &val, sizeof(int));
// If it came here, the daemon is terminated
close(fd);
if (fork_dont_care() == 0)
start_daemon(0);
}
}
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void auto_start_magiskhide() {
char *hide_prop = getprop2(MAGISKHIDE_PROP, 1);
if (hide_prop == NULL || strcmp(hide_prop, "0") != 0) {
pthread_t thread;
xpthread_create(&thread, NULL, start_magisk_hide, NULL);
pthread_detach(thread);
}
free(hide_prop);
}
void start_daemon(int post_fs_data) {
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setsid();
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setcon("u:r:"SEPOL_PROC_DOMAIN":s0");
int fd = xopen("/dev/null", O_RDWR | O_CLOEXEC);
xdup2(fd, STDIN_FILENO);
xdup2(fd, STDOUT_FILENO);
xdup2(fd, STDERR_FILENO);
close(fd);
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if (post_fs_data && fork_dont_care() == 0)
daemon_saver();
// Block user signals
sigset_t block_set;
sigemptyset(&block_set);
sigaddset(&block_set, SIGUSR1);
sigaddset(&block_set, SIGUSR2);
pthread_sigmask(SIG_SETMASK, &block_set, NULL);
struct sockaddr_un sun;
fd = setup_socket(&sun);
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if (xbind(fd, (struct sockaddr*) &sun, sizeof(sun)))
exit(1);
xlisten(fd, 10);
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// Start the log monitor
monitor_logs();
if (!post_fs_data && (access(MAGISKTMP, F_OK) == 0)) {
// Restart stuffs if the daemon is restarted
exec_command_sync("logcat", "-b", "all", "-c", NULL);
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auto_start_magiskhide();
start_debug_log();
}
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, "magiskd");
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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));
*client = xaccept4(fd, NULL, NULL, SOCK_CLOEXEC);
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pthread_t thread;
xpthread_create(&thread, NULL, request_handler, client);
// Detach the thread, we will never join it
pthread_detach(thread);
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}
}
/* Connect the daemon, and return a socketfd */
int connect_daemon(int post_fs_data) {
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struct sockaddr_un sun;
int fd = setup_socket(&sun);
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if (connect(fd, (struct sockaddr*) &sun, sizeof(sun))) {
// If we cannot access the daemon, we start a daemon in the child process if possible
if (getuid() != UID_ROOT || getgid() != UID_ROOT) {
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fprintf(stderr, "No daemon is currently running!\n");
exit(1);
}
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if (fork_dont_care() == 0) {
LOGD("client: connect fail, try launching new daemon process\n");
close(fd);
start_daemon(post_fs_data);
}
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while (connect(fd, (struct sockaddr*) &sun, sizeof(sun)))
usleep(10000);
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}
return fd;
}