Magisk/native/jni/daemon/daemon.c
2018-09-27 18:26:41 -04:00

188 lines
4.0 KiB
C

/* 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>
#include <sys/un.h>
#include <sys/types.h>
#include <sys/mount.h>
#include "magisk.h"
#include "utils.h"
#include "daemon.h"
#include "resetprop.h"
#include "selinux.h"
#include "flags.h"
int setup_done = 0;
int seperate_vendor = 0;
static void *request_handler(void *args) {
int client = *((int *) args);
free(args);
int req = read_int(client);
struct ucred credential;
get_client_cred(client, &credential);
switch (req) {
case LAUNCH_MAGISKHIDE:
case STOP_MAGISKHIDE:
case ADD_HIDELIST:
case RM_HIDELIST:
case LS_HIDELIST:
case POST_FS_DATA:
case LATE_START:
case BOOT_COMPLETE:
if (credential.uid != 0) {
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:
add_hide_list(client);
break;
case RM_HIDELIST:
rm_hide_list(client);
break;
case LS_HIDELIST:
ls_hide_list(client);
break;
case SUPERUSER:
su_daemon_receiver(client, &credential);
break;
case CHECK_VERSION:
write_string(client, xstr(MAGISK_VERSION) ":MAGISK");
close(client);
break;
case CHECK_VERSION_CODE:
write_int(client, MAGISK_VER_CODE);
close(client);
break;
case POST_FS_DATA:
post_fs_data(client);
break;
case LATE_START:
late_start(client);
break;
case BOOT_COMPLETE:
boot_complete(client);
break;
case HANDSHAKE:
/* Do NOT close the client, make it hold */
break;
default:
close(client);
break;
}
return NULL;
}
void main_daemon() {
android_logging();
#ifndef MAGISK_DEBUG
log_cb.d = nop_log;
#endif
setsid();
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);
fd = xopen("/dev/zero", O_RDWR | O_CLOEXEC);
xdup2(fd, STDIN_FILENO);
close(fd);
// Start the log monitor
check_and_start_logger();
struct sockaddr_un sun;
socklen_t len = setup_sockaddr(&sun, MAIN_DAEMON);
fd = xsocket(AF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0);
if (xbind(fd, (struct sockaddr*) &sun, len))
exit(1);
xlisten(fd, 10);
LOGI("Magisk v" xstr(MAGISK_VERSION) "(" xstr(MAGISK_VER_CODE) ") daemon started\n");
// Change process name
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);
// Loop forever to listen for requests
while(1) {
int *client = xmalloc(sizeof(int));
*client = xaccept4(fd, NULL, NULL, SOCK_CLOEXEC);
pthread_t thread;
xpthread_create(&thread, NULL, request_handler, client);
// Detach the thread, we will never join it
pthread_detach(thread);
}
}
/* Connect the daemon, set sockfd, and return if new daemon is spawned */
int connect_daemon2(daemon_t d, int *sockfd) {
struct sockaddr_un sun;
socklen_t len = setup_sockaddr(&sun, d);
*sockfd = xsocket(AF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0);
if (connect(*sockfd, (struct sockaddr*) &sun, len)) {
if (getuid() != UID_ROOT || getgid() != UID_ROOT) {
fprintf(stderr, "No daemon is currently running!\n");
exit(1);
}
if (fork_dont_care() == 0) {
LOGD("client: connect fail, try launching new daemon process\n");
close(*sockfd);
switch (d) {
case MAIN_DAEMON:
main_daemon();
break;
case LOG_DAEMON:
log_daemon();
break;
}
}
while (connect(*sockfd, (struct sockaddr*) &sun, len))
usleep(10000);
return 1;
}
return 0;
}
int connect_daemon() {
int fd;
connect_daemon2(MAIN_DAEMON, &fd);
return fd;
}