mirror of
https://github.com/topjohnwu/Magisk.git
synced 2024-11-24 18:45:28 +00:00
263 lines
8.6 KiB
C++
263 lines
8.6 KiB
C++
#include <sys/sysmacros.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <linux/input.h>
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#include <fcntl.h>
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#include <vector>
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#include <utils.hpp>
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#include "init.hpp"
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using namespace std;
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vector<string> mount_list;
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template<char... cs> using chars = integer_sequence<char, cs...>;
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// If quoted, parsing ends when we find char in [breaks]
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// If not quoted, parsing ends when we find char in [breaks] + [escapes]
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template<char... escapes, char... breaks>
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static string extract_quoted_str_until(chars<escapes...>, chars<breaks...>,
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string_view str, size_t &pos, bool "ed) {
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string result;
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char match_array[] = {escapes..., breaks..., '"'};
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string_view match(match_array, std::size(match_array));
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for (size_t cur = pos;; ++cur) {
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cur = str.find_first_of(match, cur);
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if (cur == string_view::npos ||
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((str[cur] == breaks) || ...) ||
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(!quoted && ((str[cur] == escapes) || ...))) {
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result.append(str.substr(pos, cur - pos));
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pos = cur;
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return result;
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}
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if (str[cur] == '"') {
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quoted = !quoted;
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result.append(str.substr(pos, cur - pos));
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pos = cur + 1;
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}
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}
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}
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// Parse string into key value pairs.
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// The string format: [delim][key][padding]=[padding][value][delim]
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template<char delim, char... padding>
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static kv_pairs parse_impl(chars<padding...>, string_view str) {
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kv_pairs kv;
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char skip_array[] = {'=', padding...};
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string_view skip(skip_array, std::size(skip_array));
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bool quoted = false;
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for (size_t pos = 0u; pos < str.size(); pos = str.find_first_not_of(delim, pos)) {
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auto key = extract_quoted_str_until(
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chars<padding..., delim>{}, chars<'='>{}, str, pos, quoted);
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pos = str.find_first_not_of(skip, pos);
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if (pos == string_view::npos || str[pos] == delim) {
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kv.emplace_back(key, "");
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continue;
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}
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auto value = extract_quoted_str_until(chars<delim>{}, chars<>{}, str, pos, quoted);
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kv.emplace_back(key, value);
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}
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return kv;
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}
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static kv_pairs parse_cmdline(string_view str) {
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return parse_impl<' '>(chars<>{}, str);
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}
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static kv_pairs parse_bootconfig(string_view str) {
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return parse_impl<'\n'>(chars<' '>{}, str);
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}
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#define test_bit(bit, array) (array[bit / 8] & (1 << (bit % 8)))
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static bool check_key_combo() {
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uint8_t bitmask[(KEY_MAX + 1) / 8];
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vector<int> events;
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constexpr const char *name = "/event";
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for (int minor = 64; minor < 96; ++minor) {
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if (xmknod(name, S_IFCHR | 0444, makedev(13, minor)))
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continue;
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int fd = open(name, O_RDONLY | O_CLOEXEC);
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unlink(name);
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if (fd < 0)
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continue;
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memset(bitmask, 0, sizeof(bitmask));
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ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(bitmask)), bitmask);
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if (test_bit(KEY_VOLUMEUP, bitmask))
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events.push_back(fd);
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else
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close(fd);
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}
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if (events.empty())
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return false;
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run_finally fin([&] { for_each(events.begin(), events.end(), close); });
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// Return true if volume up key is held for more than 3 seconds
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int count = 0;
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for (int i = 0; i < 500; ++i) {
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for (const int &fd : events) {
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memset(bitmask, 0, sizeof(bitmask));
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ioctl(fd, EVIOCGKEY(sizeof(bitmask)), bitmask);
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if (test_bit(KEY_VOLUMEUP, bitmask)) {
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count++;
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break;
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}
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}
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if (count >= 300) {
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LOGD("KEY_VOLUMEUP detected: disable system-as-root\n");
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return true;
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}
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// Check every 10ms
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usleep(10000);
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}
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return false;
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}
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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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// Disable kmsg rate limiting
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if (FILE *rate = fopen("/proc/sys/kernel/printk_devkmsg", "w")) {
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fprintf(rate, "on\n");
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fclose(rate);
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}
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}
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void BootConfig::set(const kv_pairs &kv) {
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for (const auto &[key, value] : kv) {
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if (key == "androidboot.slot_suffix") {
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strlcpy(slot, value.data(), sizeof(slot));
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} else if (key == "androidboot.slot") {
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slot[0] = '_';
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strlcpy(slot + 1, value.data(), sizeof(slot) - 1);
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} else if (key == "skip_initramfs") {
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skip_initramfs = true;
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} else if (key == "androidboot.force_normal_boot") {
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force_normal_boot = !value.empty() && value[0] == '1';
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} else if (key == "rootwait") {
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rootwait = true;
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} else if (key == "androidboot.android_dt_dir") {
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strlcpy(dt_dir, value.data(), sizeof(dt_dir));
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} else if (key == "androidboot.hardware") {
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strlcpy(hardware, value.data(), sizeof(hardware));
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} else if (key == "androidboot.hardware.platform") {
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strlcpy(hardware_plat, value.data(), sizeof(hardware_plat));
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} else if (key == "androidboot.fstab_suffix") {
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strlcpy(fstab_suffix, value.data(), sizeof(fstab_suffix));
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} else if (key == "qemu") {
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emulator = true;
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}
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}
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}
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void BootConfig::print() {
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LOGD("skip_initramfs=[%d]\n", skip_initramfs);
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LOGD("force_normal_boot=[%d]\n", force_normal_boot);
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LOGD("rootwait=[%d]\n", rootwait);
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LOGD("slot=[%s]\n", slot);
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LOGD("dt_dir=[%s]\n", dt_dir);
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LOGD("fstab_suffix=[%s]\n", fstab_suffix);
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LOGD("hardware=[%s]\n", hardware);
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LOGD("hardware.platform=[%s]\n", hardware_plat);
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LOGD("emulator=[%d]\n", emulator);
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}
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#define read_dt(name, key) \
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snprintf(file_name, sizeof(file_name), "%s/" name, config->dt_dir); \
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if (access(file_name, R_OK) == 0) { \
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string data = full_read(file_name); \
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if (!data.empty()) { \
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data.pop_back(); \
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strlcpy(config->key, data.data(), sizeof(config->key)); \
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} \
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}
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void load_kernel_info(BootConfig *config) {
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// Get kernel data using procfs and sysfs
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xmkdir("/proc", 0755);
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xmount("proc", "/proc", "proc", 0, nullptr);
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xmkdir("/sys", 0755);
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xmount("sysfs", "/sys", "sysfs", 0, nullptr);
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mount_list.emplace_back("/proc");
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mount_list.emplace_back("/sys");
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// Log to kernel
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setup_klog();
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config->set(parse_cmdline(full_read("/proc/cmdline")));
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config->set(parse_bootconfig(full_read("/proc/bootconfig")));
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parse_prop_file("/.backup/.magisk", [=](auto key, auto value) -> bool {
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if (key == "RECOVERYMODE" && value == "true") {
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LOGD("Running in recovery mode, waiting for key...\n");
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config->skip_initramfs = config->emulator || !check_key_combo();
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return false;
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}
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return true;
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});
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if (config->dt_dir[0] == '\0')
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strlcpy(config->dt_dir, DEFAULT_DT_DIR, sizeof(config->dt_dir));
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char file_name[128];
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read_dt("fstab_suffix", fstab_suffix)
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read_dt("hardware", hardware)
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read_dt("hardware.platform", hardware_plat)
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LOGD("Device config:\n");
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config->print();
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}
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bool check_two_stage() {
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if (access("/apex", F_OK) == 0)
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return true;
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if (access("/system/bin/init", F_OK) == 0)
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return true;
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// If we still have no indication, parse the original init and see what's up
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auto init = mmap_data(backup_init());
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return init.contains("selinux_setup");
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}
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const char *backup_init() {
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if (access("/.backup/init.real", F_OK) == 0)
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return "/.backup/init.real";
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return "/.backup/init";
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}
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