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"
int setup_done = 0;
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int seperate_vendor = 0;
int full_patch_pid = -1;
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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;
case HANDSHAKE:
/* Do NOT close the client, make it hold */
break;
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default:
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close(client);
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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;
}
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);
}
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void main_daemon() {
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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, STDOUT_FILENO);
xdup2(fd, STDERR_FILENO);
close(fd);
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fd = xopen("/dev/zero", O_RDWR | O_CLOEXEC);
xdup2(fd, STDIN_FILENO);
close(fd);
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// Start the log monitor
loggable = exec_command_sync("/system/bin/logcat", "-d", "-f", "/dev/null", NULL) == 0;
if (loggable) {
connect_daemon2(LOG_DAEMON, &fd);
write_int(fd, HANDSHAKE);
close(fd);
}
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struct sockaddr_un sun;
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fd = setup_socket(&sun, MAIN_DAEMON);
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if (xbind(fd, (struct sockaddr*) &sun, sizeof(sun)))
exit(1);
xlisten(fd, 10);
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");
// Block all user signals
sigset_t block_set;
sigemptyset(&block_set);
sigaddset(&block_set, SIGUSR1);
sigaddset(&block_set, SIGUSR2);
pthread_sigmask(SIG_SETMASK, &block_set, NULL);
// Ignore SIGPIPE
struct sigaction act;
memset(&act, 0, sizeof(act));
act.sa_handler = SIG_IGN;
sigaction(SIGPIPE, &act, NULL);
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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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}
}
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/* Connect the daemon, set sockfd, and return if new daemon is spawned */
int connect_daemon2(daemon_t d, int *sockfd) {
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struct sockaddr_un sun;
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*sockfd = setup_socket(&sun, d);
if (connect(*sockfd, (struct sockaddr*) &sun, sizeof(sun))) {
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");
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close(*sockfd);
switch (d) {
case MAIN_DAEMON:
main_daemon();
break;
case LOG_DAEMON:
log_daemon();
break;
}
}
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while (connect(*sockfd, (struct sockaddr*) &sun, sizeof(sun)))
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usleep(10000);
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return 1;
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}
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return 0;
}
int connect_daemon() {
int fd;
connect_daemon2(MAIN_DAEMON, &fd);
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return fd;
}