mirror of
https://github.com/topjohnwu/Magisk.git
synced 2024-11-24 02:25:28 +00:00
Introduce a single general purpose logcat monitor
This commit is contained in:
topjohnwu
parent
03c8d716cc
commit
3942858ccd
@ -28,10 +28,6 @@ static int seperate_vendor = 0;
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extern char **environ;
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#ifdef MAGISK_DEBUG
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static int debug_log_pid, debug_log_fd;
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#endif
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/******************
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* Node structure *
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******************/
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@ -599,15 +595,8 @@ void post_fs_data(int client) {
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if (!check_data())
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goto unblock;
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// Start log monitor
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monitor_logs();
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#ifdef MAGISK_DEBUG
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// Log everything initially
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debug_log_fd = xopen(DEBUG_LOG, O_WRONLY | O_CREAT | O_CLOEXEC | O_TRUNC, 0644);
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xwrite(debug_log_fd, "Boot logs:\n", 11);
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debug_log_pid = exec_command(0, &debug_log_fd, NULL, "logcat", "-v", "thread", NULL);
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#endif
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// Start the debug log
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start_debug_full_log();
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LOGI("** post-fs-data mode running\n");
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@ -804,12 +793,5 @@ core_only:
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buf = buf2 = NULL;
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vec_deep_destroy(&module_list);
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#ifdef MAGISK_DEBUG
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// Stop recording the boot logcat after every boot task is done
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kill(debug_log_pid, SIGTERM);
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waitpid(debug_log_pid, NULL, 0);
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// Then start to log Magisk verbosely
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xwrite(debug_log_fd, "\nVerbose logs:\n", 15);
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debug_log_pid = exec_command(0, &debug_log_fd, NULL, "logcat", "-v", "thread", "-s", "Magisk", NULL);
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#endif
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stop_debug_full_log();
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}
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@ -123,6 +123,9 @@ void start_daemon() {
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xdup2(fd, STDERR_FILENO);
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close(fd);
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// Start the log monitor
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monitor_logs();
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// Patch selinux with medium patch before we do anything
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load_policydb(SELINUX_POLICY);
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sepol_med_rules();
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@ -1,8 +1,8 @@
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/* log_monitor.c - New thread to monitor logcat
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*
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* Open a new thread to call logcat and get logs with tag "Magisk"
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* Also, write the logs to a log file for debugging purpose
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*
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* A universal logcat monitor for many usages. Add listeners to the list,
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* and the pointer of the new log line will be sent through pipes to trigger
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* asynchronous events without polling
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*/
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#include <stdio.h>
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@ -13,33 +13,150 @@
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#include "magisk.h"
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#include "utils.h"
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#include "daemon.h"
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int logcat_events[] = { -1, -1, -1 };
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static int is_restart = 0;
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#ifdef MAGISK_DEBUG
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static int debug_log_pid, debug_log_fd;
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#endif
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static void *logger_thread(void *args) {
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// Setup error handler
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err_handler = exit_thread;
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rename(LOGFILE, LASTLOG);
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int log_fd, log_pid;
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log_fd = xopen(LOGFILE, O_WRONLY | O_CREAT | O_CLOEXEC | O_TRUNC, 0644);
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int log_fd = -1, log_pid;
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char line[4096];
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while (1) {
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// Clear buffer
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exec_command_sync("logcat", "-b", "all", "-c", NULL);
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// Start logcat
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log_pid = exec_command(0, &log_fd, NULL, "logcat", "-v", "thread", "Magisk:I", "*:S", NULL);
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if (log_pid > 0)
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waitpid(log_pid, NULL, 0);
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// For some reason it went here, clear buffer and restart
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exec_command_sync("logcat", "-c", NULL);
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log_pid = exec_command(0, &log_fd, NULL, "logcat", "-b", "events", "-b", "default", "-s", "am_proc_start", "Magisk", NULL);
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while (fdgets(line, sizeof(line), log_fd)) {
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for (int i = 0; i < (sizeof(logcat_events) / sizeof(int)); ++i) {
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if (logcat_events[i] > 0) {
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char *s = strdup(line);
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xwrite(logcat_events[i], &s, sizeof(s));
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}
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}
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if (kill(log_pid, 0))
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break;
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}
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}
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// Should never be here, but well...
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return NULL;
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}
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/* Start a new thread to monitor logcat and dump to logfile */
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static void *magisk_log_thread(void *args) {
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// Setup error handler
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err_handler = exit_thread;
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int have_data = 0;
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// Temp buffer for logs before we have data access
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struct vector logs;
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vec_init(&logs);
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FILE *log;
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int pipefd[2];
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if (xpipe2(pipefd, O_CLOEXEC) == -1)
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return NULL;
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// Register our listener
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logcat_events[LOG_EVENT] = pipefd[1];
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for (char *line; xxread(pipefd[0], &line, sizeof(line)) > 0; free(line)) {
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char *ss;
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if ((ss = strstr(line, " Magisk")) && (ss[-1] != 'D') && (ss[-1] != 'V')) {
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if (!have_data) {
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if ((have_data = check_data())) {
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// Dump buffered logs to file
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if (!is_restart)
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rename(LOGFILE, LASTLOG);
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log = xfopen(LOGFILE, "a");
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setbuf(log, NULL);
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char *tmp;
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vec_for_each(&logs, tmp) {
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fprintf(log, "%s", tmp);
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free(tmp);
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}
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vec_destroy(&logs);
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} else {
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vec_push_back(&logs, line);
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}
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}
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if (have_data)
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fprintf(log, "%s", line);
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}
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}
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return NULL;
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}
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static void *debug_magisk_log_thread(void *args) {
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// Setup error handler
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err_handler = exit_thread;
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FILE *log = xfopen(DEBUG_LOG, "a");
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setbuf(log, NULL);
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int pipefd[2];
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if (xpipe2(pipefd, O_CLOEXEC) == -1)
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return NULL;
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// Register our listener
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logcat_events[DEBUG_EVENT] = pipefd[1];
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for (char *line; xxread(pipefd[0], &line, sizeof(line)) > 0; free(line)) {
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char *ss;
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if ((ss = strstr(line, "Magisk")))
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fprintf(log, "%s", line);
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}
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return NULL;
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}
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/* Start new threads to monitor logcat and dump to logfile */
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void monitor_logs() {
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pthread_t thread;
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is_restart = check_data();
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// Start log file dumper before monitor
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xpthread_create(&thread, NULL, magisk_log_thread, NULL);
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pthread_detach(thread);
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#ifdef MAGISK_DEBUG
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if (is_restart) {
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// Restart debug logs
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xpthread_create(&thread, NULL, debug_magisk_log_thread, NULL);
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pthread_detach(thread);
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}
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#endif
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// Start logcat monitor
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xpthread_create(&thread, NULL, logger_thread, NULL);
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pthread_detach(thread);
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}
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void start_debug_full_log() {
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#ifdef MAGISK_DEBUG
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// Log everything initially
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debug_log_fd = xopen(DEBUG_LOG, O_WRONLY | O_CREAT | O_CLOEXEC | O_TRUNC, 0644);
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debug_log_pid = exec_command(0, &debug_log_fd, NULL, "logcat", NULL);
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close(debug_log_fd);
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#endif
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}
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void stop_debug_full_log() {
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#ifdef MAGISK_DEBUG
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// Stop recording the boot logcat after every boot task is done
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kill(debug_log_pid, SIGTERM);
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waitpid(debug_log_pid, NULL, 0);
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pthread_t thread;
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// Start debug thread
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xpthread_create(&thread, NULL, debug_magisk_log_thread, NULL);
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pthread_detach(thread);
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#endif
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}
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@ -50,10 +50,6 @@ void write_int(int fd, int val);
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char* read_string(int fd);
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void write_string(int fd, const char* val);
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// log_monitor.c
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void monitor_logs();
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/***************
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* Boot Stages *
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***************/
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@ -34,6 +34,17 @@ static inline void do_nothing() {}
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#define PLOGE(fmt, args...) { LOGE(fmt " failed with %d: %s", ##args, errno, strerror(errno)); err_handler(); }
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enum {
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HIDE_EVENT,
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LOG_EVENT,
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DEBUG_EVENT
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};
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extern int logcat_events[];
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void monitor_logs();
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void start_debug_full_log();
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void stop_debug_full_log();
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#else // IS_DAEMON
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#include <stdio.h>
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@ -90,6 +90,7 @@ void fclone_attr(const int sourcefd, const int targetfd);
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void clone_attr(const char *source, const char *target);
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void get_client_cred(int fd, struct ucred *cred);
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int switch_mnt_ns(int pid);
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int fork_dont_care();
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// img.c
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@ -19,27 +19,20 @@
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#include "utils.h"
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#include "magiskhide.h"
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static int zygote_num;
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static char init_ns[32], zygote_ns[2][32], cache_block[256];
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static int log_pid, log_fd, target_pid, has_cache = 1;
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static char *buffer;
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static int zygote_num, has_cache = 1, pipefd[2] = { -1, -1 };
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// Workaround for the lack of pthread_cancel
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static void quit_pthread(int sig) {
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err_handler = do_nothing;
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LOGD("proc_monitor: running cleanup\n");
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destroy_list();
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free(buffer);
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hideEnabled = 0;
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// Kill the logging if needed
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if (log_pid > 0) {
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kill(log_pid, SIGTERM);
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waitpid(log_pid, NULL, 0);
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close(log_fd);
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}
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// Resume process if possible
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if (target_pid > 0)
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kill(target_pid, SIGCONT);
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// Unregister listener
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logcat_events[HIDE_EVENT] = -1;
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close(pipefd[0]);
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close(pipefd[1]);
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pipefd[0] = pipefd[1] = -1;
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pthread_mutex_destroy(&hide_lock);
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pthread_mutex_destroy(&file_lock);
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LOGD("proc_monitor: terminating...\n");
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@ -47,7 +40,7 @@ static void quit_pthread(int sig) {
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}
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static void proc_monitor_err() {
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LOGD("proc_monitor: error occured, stopping magiskhide services\n");
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LOGE("proc_monitor: error occured, stopping magiskhide services\n");
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quit_pthread(SIGUSR1);
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}
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@ -77,25 +70,24 @@ static void lazy_unmount(const char* mountpoint) {
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}
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static void hide_daemon_err() {
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LOGD("hide_daemon: error occured, stopping magiskhide services\n");
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_exit(-1);
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LOGE("hide_daemon: error occured\n");
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}
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static void hide_daemon(int pid) {
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LOGD("hide_daemon: start unmount for pid=[%d]\n", pid);
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// When an error occurs, report its failure to main process
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// When an error occurs, report its failure
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err_handler = hide_daemon_err;
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char *line;
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char *line, buffer[PATH_MAX];
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struct vector mount_list;
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manage_selinux();
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clean_magisk_props();
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if (switch_mnt_ns(pid))
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return;
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goto exit;
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snprintf(buffer, PATH_MAX, "/proc/%d/mounts", pid);
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snprintf(buffer, sizeof(buffer), "/proc/%d/mounts", pid);
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vec_init(&mount_list);
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file_to_vector(buffer, &mount_list);
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@ -132,7 +124,7 @@ static void hide_daemon(int pid) {
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vec_destroy(&mount_list);
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// Re-read mount infos
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snprintf(buffer, PATH_MAX, "/proc/%d/mounts", pid);
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snprintf(buffer, sizeof(buffer), "/proc/%d/mounts", pid);
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vec_init(&mount_list);
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file_to_vector(buffer, &mount_list);
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@ -145,8 +137,12 @@ static void hide_daemon(int pid) {
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free(line);
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}
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// Free uo memory
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exit:
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// Send resume signal
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kill(pid, SIGCONT);
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// Free up memory
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vec_destroy(&mount_list);
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_exit(0);
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}
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void proc_monitor() {
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@ -158,9 +154,7 @@ void proc_monitor() {
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// The error handler should stop magiskhide services
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err_handler = proc_monitor_err;
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log_pid = target_pid = -1;
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buffer = xmalloc(PATH_MAX);
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cache_block[0] = '\0';
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// Get the mount namespace of init
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@ -188,20 +182,15 @@ void proc_monitor() {
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break;
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}
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while (1) {
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// Clear previous logcat buffer
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exec_command_sync("logcat", "-b", "events", "-c", NULL);
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// Register our listener to logcat monitor
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xpipe2(pipefd, O_CLOEXEC);
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logcat_events[HIDE_EVENT] = pipefd[1];
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// Monitor am_proc_start
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log_fd = -1;
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log_pid = exec_command(0, &log_fd, NULL, "logcat", "-b", "events", "-v", "raw", "-s", "am_proc_start", NULL);
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if (log_pid < 0) continue;
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if (kill(log_pid, 0)) continue;
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while(fdgets(buffer, PATH_MAX, log_fd)) {
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for (char *log, *line; xxread(pipefd[0], &log, sizeof(log)) > 0; free(log)) {
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char *ss;
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if ((ss = strstr(log, "am_proc_start")) && (ss = strchr(ss, '['))) {
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int pid, ret, comma = 0;
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char *pos = buffer, *line, processName[256];
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char *pos = ss, processName[256], ns[32];
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while(1) {
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pos = strchr(pos, ',');
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@ -212,9 +201,9 @@ void proc_monitor() {
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}
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if (comma == 6)
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ret = sscanf(buffer, "[%*d %d %*d %*d %256s", &pid, processName);
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ret = sscanf(ss, "[%*d %d %*d %*d %256s", &pid, processName);
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else
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ret = sscanf(buffer, "[%*d %d %*d %256s", &pid, processName);
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ret = sscanf(ss, "[%*d %d %*d %256s", &pid, processName);
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if(ret != 2)
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continue;
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@ -225,12 +214,11 @@ void proc_monitor() {
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pthread_mutex_lock(&hide_lock);
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vec_for_each(hide_list, line) {
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if (strcmp(processName, line) == 0) {
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target_pid = pid;
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while(1) {
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ret = 1;
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for (int i = 0; i < zygote_num; ++i) {
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read_namespace(target_pid, buffer, 32);
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if (strcmp(buffer, zygote_ns[i]) == 0) {
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read_namespace(pid, ns, sizeof(ns));
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if (strcmp(ns, zygote_ns[i]) == 0) {
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usleep(50);
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ret = 0;
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break;
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@ -240,43 +228,21 @@ void proc_monitor() {
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}
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// Send pause signal ASAP
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if (kill(target_pid, SIGSTOP) == -1) continue;
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if (kill(pid, SIGSTOP) == -1) continue;
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LOGI("proc_monitor: %s (PID=%d ns=%s)\n", processName, target_pid, buffer);
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LOGI("proc_monitor: %s (PID=%d ns=%s)\n", processName, pid, ns);
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/*
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* The setns system call do not support multithread processes
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* We have to fork a new process, setns, then do the unmounts
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*/
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int hide_pid = fork();
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switch(hide_pid) {
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case -1:
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PLOGE("fork");
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return;
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case 0:
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hide_daemon(target_pid);
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_exit(0);
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default:
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break;
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}
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if (fork_dont_care() == 0)
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hide_daemon(pid);
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// Wait till the unmount process is done
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waitpid(hide_pid, &ret, 0);
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if (WEXITSTATUS(ret))
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quit_pthread(SIGUSR1);
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// All done, send resume signal
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kill(target_pid, SIGCONT);
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target_pid = -1;
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break;
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}
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}
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pthread_mutex_unlock(&hide_lock);
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}
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// For some reason it went here, restart logging
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kill(log_pid, SIGTERM);
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waitpid(log_pid, NULL, 0);
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close(log_fd);
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}
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}
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@ -408,3 +408,14 @@ int switch_mnt_ns(int pid) {
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||||
close(fd);
|
||||
return ret;
|
||||
}
|
||||
|
||||
int fork_dont_care() {
|
||||
int pid = fork();
|
||||
if (pid) {
|
||||
waitpid(pid, NULL, 0);
|
||||
return pid;
|
||||
} else if ((pid = fork())) {
|
||||
exit(0);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user