127 lines
2.8 KiB
C
127 lines
2.8 KiB
C
/* log_monitor.c - New thread to monitor logcat
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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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#include <pthread.h>
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#include <unistd.h>
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#include <sys/wait.h>
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#include <fcntl.h>
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#include "magisk.h"
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#include "utils.h"
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#include "resetprop.h"
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int loggable = 1;
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static int am_proc_start_filter(const char *log) {
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return strstr(log, "am_proc_start") != NULL;
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}
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static int magisk_log_filter(const char *log) {
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char *ss;
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return (ss = strstr(log, " Magisk")) && (ss[-1] != 'D') && (ss[-1] != 'V');
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}
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static int magisk_debug_log_filter(const char *log) {
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return strstr(log, "am_proc_start") == NULL;
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}
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struct log_listener log_events[] = {
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{ /* HIDE_EVENT */
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.fd = -1,
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.filter = am_proc_start_filter
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},
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{ /* LOG_EVENT */
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.fd = -1,
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.filter = magisk_log_filter
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},
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{ /* DEBUG_EVENT */
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.fd = -1,
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.filter = magisk_debug_log_filter
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}
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};
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#define EVENT_NUM (sizeof(log_events) / sizeof(struct log_listener))
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static void test_logcat() {
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int log_fd = -1, log_pid;
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char buf[1];
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log_pid = exec_command(0, &log_fd, NULL, "logcat", NULL);
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if (read(log_fd, buf, sizeof(buf)) != sizeof(buf)) {
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loggable = 0;
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LOGD("log_monitor: cannot read from logcat, disable logging");
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}
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kill(log_pid, SIGTERM);
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waitpid(log_pid, NULL, 0);
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}
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static void *logger_thread(void *args) {
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int log_fd = -1, log_pid;
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char line[PIPE_BUF];
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LOGD("log_monitor: logger start");
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while (1) {
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if (!loggable) {
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// Disable all services
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for (int i = 0; i < EVENT_NUM; ++i) {
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close(log_events[i].fd);
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log_events[i].fd = -1;
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}
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return NULL;
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}
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// Start logcat
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log_pid = exec_command(0, &log_fd, NULL,
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"/system/bin/logcat",
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"-b", "events", "-b", "main", "-b", "crash",
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"-v", "threadtime",
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"-s", "am_proc_start", "Magisk", "*:F",
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NULL);
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FILE *logs = fdopen(log_fd, "r");
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while (fgets(line, sizeof(line), logs)) {
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if (line[0] == '-')
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continue;
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size_t len = strlen(line);
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for (int i = 0; i < EVENT_NUM; ++i) {
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if (log_events[i].fd > 0 && log_events[i].filter(line))
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xwrite(log_events[i].fd, line, len);
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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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// Cleanup
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fclose(logs);
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log_fd = -1;
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kill(log_pid, SIGTERM);
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waitpid(log_pid, NULL, 0);
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test_logcat();
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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 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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test_logcat();
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if (loggable) {
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rename(LOGFILE, LOGFILE ".bak");
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log_events[LOG_EVENT].fd = creat(LOGFILE, 0644);
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#ifdef MAGISK_DEBUG
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log_events[DEBUG_EVENT].fd = creat(DEBUG_LOG, 0644);
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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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}
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