Magisk/native/jni/core/daemon.cpp
topjohnwu 2f824f59dc Better logging system
Use C++ magic to strip out debug logs at compile time
2020-06-01 04:15:37 -07:00

253 lines
5.8 KiB
C++

#include <fcntl.h>
#include <pthread.h>
#include <signal.h>
#include <libgen.h>
#include <sys/un.h>
#include <sys/types.h>
#include <sys/mount.h>
#include <android/log.h>
#include <magisk.hpp>
#include <utils.hpp>
#include <daemon.hpp>
#include <selinux.hpp>
#include <db.hpp>
#include <resetprop.hpp>
#include <flags.hpp>
using namespace std;
int SDK_INT = -1;
bool RECOVERY_MODE = false;
string MAGISKTMP;
int DAEMON_STATE = STATE_UNKNOWN;
static struct stat self_st;
static bool verify_client(int client, pid_t pid) {
// Verify caller is the same as server
char path[32];
sprintf(path, "/proc/%d/exe", pid);
struct stat st;
return !(stat(path, &st) || st.st_dev != self_st.st_dev || st.st_ino != self_st.st_ino);
}
static void request_handler(int client, int req_code, ucred cred) {
switch (req_code) {
case MAGISKHIDE:
magiskhide_handler(client);
break;
case SUPERUSER:
su_daemon_handler(client, &cred);
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 SQLITE_CMD:
exec_sql(client);
break;
case REMOVE_MODULES:
foreach_modules("remove");
write_int(client, 0);
close(client);
reboot();
break;
default:
close(client);
break;
}
}
static void handle_request(int client) {
int req_code;
// Verify client credentials
ucred cred;
get_client_cred(client, &cred);
if (cred.uid != 0 && !verify_client(client, cred.pid))
goto shortcut;
// Check client permissions
req_code = read_int(client);
switch (req_code) {
case MAGISKHIDE:
case POST_FS_DATA:
case LATE_START:
case BOOT_COMPLETE:
case SQLITE_CMD:
case GET_PATH:
if (cred.uid != 0) {
write_int(client, ROOT_REQUIRED);
goto shortcut;
}
break;
case REMOVE_MODULES:
if (cred.uid != UID_SHELL && cred.uid != UID_ROOT) {
write_int(client, 1);
goto shortcut;
}
break;
}
switch (req_code) {
// In case of init trigger launches, set the corresponding states
case POST_FS_DATA:
DAEMON_STATE = STATE_POST_FS_DATA;
break;
case LATE_START:
DAEMON_STATE = STATE_LATE_START;
break;
case BOOT_COMPLETE:
DAEMON_STATE = STATE_BOOT_COMPLETE;
break;
// Simple requests to query daemon info
case CHECK_VERSION:
write_string(client, MAGISK_VERSION ":MAGISK");
goto shortcut;
case CHECK_VERSION_CODE:
write_int(client, MAGISK_VER_CODE);
goto shortcut;
case GET_PATH:
write_string(client, MAGISKTMP.data());
goto shortcut;
case DO_NOTHING:
goto shortcut;
}
// Create new thread to handle complex requests
new_daemon_thread(std::bind(&request_handler, client, req_code, cred));
return;
shortcut:
close(client);
}
#define vlog __android_log_vprint
static void android_logging() {
static constexpr char TAG[] = "Magisk";
log_cb.d = [](auto fmt, auto ap){ return vlog(ANDROID_LOG_DEBUG, TAG, fmt, ap); };
log_cb.i = [](auto fmt, auto ap){ return vlog(ANDROID_LOG_INFO, TAG, fmt, ap); };
log_cb.w = [](auto fmt, auto ap){ return vlog(ANDROID_LOG_WARN, TAG, fmt, ap); };
log_cb.e = [](auto fmt, auto ap){ return vlog(ANDROID_LOG_ERROR, TAG, fmt, ap); };
log_cb.ex = nop_ex;
}
static void daemon_entry(int ppid) {
android_logging();
int fd = xopen("/dev/null", O_WRONLY);
xdup2(fd, STDOUT_FILENO);
xdup2(fd, STDERR_FILENO);
if (fd > STDERR_FILENO)
close(fd);
fd = xopen("/dev/zero", O_RDONLY);
xdup2(fd, STDIN_FILENO);
if (fd > STDERR_FILENO)
close(fd);
setsid();
setcon("u:r:" SEPOL_PROC_DOMAIN ":s0");
// Make sure ppid is not in acct
char src[64], dest[64];
sprintf(src, "/acct/uid_0/pid_%d", ppid);
sprintf(dest, "/acct/uid_0/pid_%d", getpid());
rename(src, dest);
// Get self stat
xreadlink("/proc/self/exe", src, sizeof(src));
MAGISKTMP = dirname(src);
xstat("/proc/self/exe", &self_st);
restore_tmpcon();
// SAR cleanups
auto mount_list = MAGISKTMP + "/" ROOTMNT;
if (access(mount_list.data(), F_OK) == 0) {
file_readline(true, mount_list.data(), [](string_view line) -> bool {
umount2(line.data(), MNT_DETACH);
return true;
});
}
unlink("/dev/.se");
LOGI(NAME_WITH_VER(Magisk) " daemon started\n");
// Get API level
parse_prop_file("/system/build.prop", [](auto key, auto val) -> bool {
if (key == "ro.build.version.sdk") {
SDK_INT = parse_int(val);
return false;
}
return true;
});
if (SDK_INT < 0) {
// In case some devices do not store this info in build.prop, fallback to getprop
auto sdk = getprop("ro.build.version.sdk");
if (!sdk.empty()) {
SDK_INT = parse_int(sdk);
}
}
LOGI("* Device API level: %d\n", SDK_INT);
// Load config status
auto config = MAGISKTMP + "/" INTLROOT "/config";
parse_prop_file(config.data(), [](auto key, auto val) -> bool {
if (key == "RECOVERYMODE" && val == "true")
RECOVERY_MODE = true;
return true;
});
struct sockaddr_un sun;
socklen_t len = setup_sockaddr(&sun, MAIN_SOCKET);
fd = xsocket(AF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0);
if (xbind(fd, (struct sockaddr*) &sun, len))
exit(1);
xlisten(fd, 10);
// Change process name
set_nice_name("magiskd");
// Block all signals
sigset_t block_set;
sigfillset(&block_set);
pthread_sigmask(SIG_SETMASK, &block_set, nullptr);
// Loop forever to listen for requests
for (;;) {
int client = xaccept4(fd, nullptr, nullptr, SOCK_CLOEXEC);
handle_request(client);
}
}
int connect_daemon(bool create) {
struct sockaddr_un sun;
socklen_t len = setup_sockaddr(&sun, MAIN_SOCKET);
int fd = xsocket(AF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0);
if (connect(fd, (struct sockaddr*) &sun, len)) {
if (!create || getuid() != UID_ROOT || getgid() != UID_ROOT) {
LOGE("No daemon is currently running!\n");
exit(1);
}
int ppid = getpid();
LOGD("client: launching new main daemon process\n");
if (fork_dont_care() == 0) {
close(fd);
daemon_entry(ppid);
}
while (connect(fd, (struct sockaddr*) &sun, len))
usleep(10000);
}
return fd;
}