Magisk/native/jni/core/scripting.cpp

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#include <unistd.h>
#include <cstdio>
#include <cstdlib>
#include <string>
#include <vector>
#include <magisk.h>
#include <utils.h>
#include <selinux.h>
using namespace std;
static void set_path() {
char buf[4096];
sprintf(buf, BBPATH ":%s", getenv("PATH"));
setenv("PATH", buf, 1);
}
void exec_script(const char *script) {
exec_t exec {
.pre_exec = set_path,
.fork = fork_no_zombie
};
exec_command_sync(exec, "/system/bin/sh", script);
}
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void exec_common_script(const char *stage) {
char path[4096];
DIR *dir;
struct dirent *entry;
sprintf(path, SECURE_DIR "/%s.d", stage);
if (!(dir = xopendir(path)))
return;
chdir(path);
bool pfs = strcmp(stage, "post-fs-data") == 0;
while ((entry = xreaddir(dir))) {
if (entry->d_type == DT_REG) {
if (access(entry->d_name, X_OK) == -1)
continue;
LOGI("%s.d: exec [%s]\n", stage, entry->d_name);
exec_t exec {
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.pre_exec = set_path,
.fork = pfs ? fork_no_zombie : fork_dont_care
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};
if (pfs)
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exec_command_sync(exec, "/system/bin/sh", entry->d_name);
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else
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exec_command(exec, "/system/bin/sh", entry->d_name);
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}
}
closedir(dir);
chdir("/");
}
void exec_module_script(const char *stage, const vector<string> &module_list) {
char path[4096];
bool pfs = strcmp(stage, "post-fs-data") == 0;
for (auto &m : module_list) {
const char* module = m.c_str();
sprintf(path, MODULEROOT "/%s/%s.sh", module, stage);
if (access(path, F_OK) == -1)
continue;
LOGI("%s: exec [%s.sh]\n", module, stage);
exec_t exec {
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.pre_exec = set_path,
.fork = pfs ? fork_no_zombie : fork_dont_care
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};
if (pfs)
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exec_command_sync(exec, "/system/bin/sh", path);
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else
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exec_command(exec, "/system/bin/sh", path);
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}
}
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constexpr char migrate_script[] =
"MODULEROOT=" MODULEROOT R"EOF(
IMG=%s
MNT=/dev/img_mnt
e2fsck -yf $IMG
mkdir -p $MNT
for num in 0 1 2 3 4 5 6 7; do
losetup /dev/block/loop${num} $IMG || continue
mount -t ext4 /dev/block/loop${num} $MNT
rm -rf $MNT/lost+found $MNT/.core
magisk --clone $MNT $MODULEROOT
umount $MNT
rm -rf $MNT
losetup -d /dev/block/loop${num}
break
done
rm -rf $IMG
)EOF";
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void migrate_img(const char *img) {
LOGI("* Migrating %s\n", img);
exec_t exec { .pre_exec = set_path };
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char cmds[sizeof(migrate_script) + 128];
sprintf(cmds, migrate_script, img);
exec_command_sync(exec, "/system/bin/sh", "-c", cmds);
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}
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constexpr char install_script[] = R"EOF(
APK=%s
log -t Magisk "apk_install: $APK"
log -t Magisk "apk_install: `pm install -r $APK 2>&1`"
rm -f $APK
)EOF";
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void install_apk(const char *apk) {
setfilecon(apk, "u:object_r:" SEPOL_FILE_DOMAIN ":s0");
exec_t exec {
.pre_exec = set_path,
.fork = fork_no_zombie
};
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char cmds[sizeof(install_script) + 4096];
sprintf(cmds, install_script, apk);
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exec_command_sync(exec, "/system/bin/sh", "-c", cmds);
}