240 lines
5.5 KiB
C++
240 lines
5.5 KiB
C++
#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/sysmacros.h>
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#include <stdio.h>
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#include <string.h>
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#include <fcntl.h>
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#include <libgen.h>
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#include <vector>
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#include <xz.h>
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#include <magisk.h>
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#include <cpio.h>
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#include <utils.h>
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#include <flags.h>
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#include "binaries.h"
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#ifdef USE_64BIT
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#include "binaries_arch64.h"
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#else
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#include "binaries_arch.h"
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#endif
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#include "init.h"
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using namespace std;
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constexpr const char *init_applet[] =
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{ "magiskpolicy", "supolicy", "magisk", nullptr };
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constexpr int (*init_applet_main[])(int, char *[]) =
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{ magiskpolicy_main, magiskpolicy_main, magisk_proxy_main, nullptr };
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#ifdef MAGISK_DEBUG
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static FILE *kmsg;
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static char kmsg_buf[4096];
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static int vprintk(const char *fmt, va_list ap) {
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vsnprintf(kmsg_buf + 12, sizeof(kmsg_buf) - 12, fmt, ap);
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return fprintf(kmsg, "%s", kmsg_buf);
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}
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void setup_klog() {
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// Shut down first 3 fds
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int fd;
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if (access("/dev/null", W_OK) == 0) {
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fd = xopen("/dev/null", O_RDWR | O_CLOEXEC);
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} else {
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mknod("/null", S_IFCHR | 0666, makedev(1, 3));
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fd = xopen("/null", O_RDWR | O_CLOEXEC);
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unlink("/null");
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}
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xdup3(fd, STDIN_FILENO, O_CLOEXEC);
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xdup3(fd, STDOUT_FILENO, O_CLOEXEC);
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xdup3(fd, STDERR_FILENO, O_CLOEXEC);
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if (fd > STDERR_FILENO)
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close(fd);
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if (access("/dev/kmsg", W_OK) == 0) {
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fd = xopen("/dev/kmsg", O_WRONLY | O_CLOEXEC);
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} else {
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mknod("/kmsg", S_IFCHR | 0666, makedev(1, 11));
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fd = xopen("/kmsg", O_WRONLY | O_CLOEXEC);
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unlink("/kmsg");
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}
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kmsg = fdopen(fd, "w");
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setbuf(kmsg, nullptr);
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log_cb.d = log_cb.i = log_cb.w = log_cb.e = vprintk;
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log_cb.ex = nop_ex;
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strcpy(kmsg_buf, "magiskinit: ");
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}
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#else
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void setup_klog() {}
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#endif
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static bool unxz(int fd, const uint8_t *buf, size_t size) {
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uint8_t out[8192];
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xz_crc32_init();
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struct xz_dec *dec = xz_dec_init(XZ_DYNALLOC, 1 << 26);
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struct xz_buf b = {
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.in = buf,
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.in_pos = 0,
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.in_size = size,
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.out = out,
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.out_pos = 0,
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.out_size = sizeof(out)
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};
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enum xz_ret ret;
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do {
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ret = xz_dec_run(dec, &b);
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if (ret != XZ_OK && ret != XZ_STREAM_END)
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return false;
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write(fd, out, b.out_pos);
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b.out_pos = 0;
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} while (b.in_pos != size);
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return true;
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}
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static void decompress_ramdisk() {
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constexpr char tmp[] = "tmp.cpio";
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constexpr char ramdisk_xz[] = "ramdisk.cpio.xz";
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if (access(ramdisk_xz, F_OK))
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return;
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LOGD("Decompressing ramdisk from %s\n", ramdisk_xz);
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uint8_t *buf;
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size_t sz;
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mmap_ro(ramdisk_xz, buf, sz);
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int fd = open(tmp, O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC);
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unxz(fd, buf, sz);
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munmap(buf, sz);
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close(fd);
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cpio_mmap cpio(tmp);
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cpio.extract();
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unlink(tmp);
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unlink(ramdisk_xz);
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}
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int dump_magisk(const char *path, mode_t mode) {
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int fd = open(path, O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC, mode);
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if (fd < 0)
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return 1;
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if (!unxz(fd, magisk_xz, sizeof(magisk_xz)))
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return 1;
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close(fd);
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return 0;
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}
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static int dump_manager(const char *path, mode_t mode) {
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int fd = open(path, O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC, mode);
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if (fd < 0)
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return 1;
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if (!unxz(fd, manager_xz, sizeof(manager_xz)))
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return 1;
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close(fd);
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return 0;
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}
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class RecoveryInit : public BaseInit {
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public:
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RecoveryInit(char *argv[], cmdline *cmd) : BaseInit(argv, cmd) {};
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void start() override {
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LOGD("Ramdisk is recovery, abort\n");
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rename("/.backup/init", "/init");
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rm_rf("/.backup");
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exec_init();
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}
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};
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class TestInit : public BaseInit {
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public:
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TestInit(char *argv[], cmdline *cmd) : BaseInit(argv, cmd) {};
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void start() override {
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// Write init tests here
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}
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};
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static void setup_test(const char *dir) {
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// Log to console
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cmdline_logging();
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log_cb.ex = nop_ex;
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// Switch to isolate namespace
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xunshare(CLONE_NEWNS);
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xmount(nullptr, "/", nullptr, MS_PRIVATE | MS_REC, nullptr);
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// Unmount everything in reverse
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vector<string> mounts;
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parse_mnt("/proc/mounts", [&](mntent *me) {
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if (me->mnt_dir != "/"sv)
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mounts.emplace_back(me->mnt_dir);
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return true;
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});
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for (auto m = mounts.rbegin(); m != mounts.rend(); ++m)
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xumount(m->data());
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// chroot jail
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chdir(dir);
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chroot(".");
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chdir("/");
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}
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int main(int argc, char *argv[]) {
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umask(0);
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for (int i = 0; init_applet[i]; ++i) {
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if (strcmp(basename(argv[0]), init_applet[i]) == 0)
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return (*init_applet_main[i])(argc, argv);
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}
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if (argc > 1 && strcmp(argv[1], "-x") == 0) {
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if (strcmp(argv[2], "magisk") == 0)
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return dump_magisk(argv[3], 0755);
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else if (strcmp(argv[2], "manager") == 0)
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return dump_manager(argv[3], 0644);
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}
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if (argc > 1 && argv[1] == "selinux_setup"sv) {
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auto init = make_unique<SecondStageInit>(argv);
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init->start();
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}
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#ifdef MAGISK_DEBUG
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bool run_test = getenv("INIT_TEST") != nullptr;
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#else
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constexpr bool run_test = false;
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#endif
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if (run_test) {
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setup_test(dirname(argv[0]));
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} else {
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if (getpid() != 1)
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return 1;
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setup_klog();
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}
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cmdline cmd{};
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load_kernel_info(&cmd);
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unique_ptr<BaseInit> init;
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if (run_test) {
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init = make_unique<TestInit>(argv, &cmd);
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} else if (cmd.force_normal_boot) {
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init = make_unique<ABFirstStageInit>(argv, &cmd);
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} else if (cmd.system_as_root) {
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if (access("/overlay", F_OK) == 0) /* Compatible mode */
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init = make_unique<SARCompatInit>(argv, &cmd);
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else
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init = make_unique<SARInit>(argv, &cmd);
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} else {
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decompress_ramdisk();
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if (access("/sbin/recovery", F_OK) == 0 || access("/system/bin/recovery", F_OK) == 0)
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init = make_unique<RecoveryInit>(argv, &cmd);
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else if (access("/apex", F_OK) == 0)
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init = make_unique<AFirstStageInit>(argv, &cmd);
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else
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init = make_unique<RootFSInit>(argv, &cmd);
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}
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// Run the main routine
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init->start();
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exit(1);
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}
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