MarcoBuster/Magisk
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Improve log_monitor implementation

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This commit is contained in:
topjohnwu 2018-07-01 18:18:12 +08:00
parent d149af9628
commit 7243b9e72f
4 changed files with 30 additions and 106 deletions
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5
native/jni/core/bootstages.c
View File

@ -673,9 +673,6 @@ void post_fs_data(int client) {
// If post-fs-data mode is started, it means startup succeeded
setup_done = 1;
// Start the debug log
start_debug_full_log();
LOGI("** post-fs-data mode running\n");
xmount(NULL, "/", NULL, MS_REMOUNT | MS_RDONLY, NULL);
@ -842,6 +839,4 @@ core_only:
free(buf2);
buf = buf2 = NULL;
vec_deep_destroy(&module_list);
stop_debug_full_log();
}

118
native/jni/core/log_monitor.c
View File

@ -9,6 +9,7 @@
#include <pthread.h>
#include <unistd.h>
#include <sys/wait.h>
#include <fcntl.h>
#include "magisk.h"
#include "utils.h"
@ -26,7 +27,7 @@ static int magisk_log_filter(const char *log) {
}
static int magisk_debug_log_filter(const char *log) {
return strstr(log, "Magisk") != NULL;
return strstr(log, "am_proc_start") == NULL;
}
struct log_listener log_events[] = {
@ -43,10 +44,7 @@ struct log_listener log_events[] = {
.filter = magisk_debug_log_filter
}
};
#ifdef MAGISK_DEBUG
static int debug_log_pid = -1, debug_log_fd = -1;
#endif
#define EVENT_NUM (sizeof(log_events) / sizeof(struct log_listener))
static void test_logcat() {
int log_fd = -1, log_pid;
@ -62,14 +60,14 @@ static void test_logcat() {
static void *logger_thread(void *args) {
int log_fd = -1, log_pid;
char line[4096];
char line[PIPE_BUF];
LOGD("log_monitor: logger start");
while (1) {
if (!loggable) {
// Disable all services
for (int i = 0; i < (sizeof(log_events) / sizeof(struct log_listener)); ++i) {
for (int i = 0; i < EVENT_NUM; ++i) {
close(log_events[i].fd);
log_events[i].fd = -1;
}
@ -77,27 +75,30 @@ static void *logger_thread(void *args) {
}
// Start logcat
log_pid = exec_command(0, &log_fd, NULL, "logcat", "-b", "events", "-b", "main", "-v", "threadtime", "-s", "am_proc_start", "-s", "Magisk", NULL);
while (fdgets(line, sizeof(line), log_fd)) {
for (int i = 0; i < (sizeof(log_events) / sizeof(struct log_listener)); ++i) {
if (log_events[i].fd > 0 && log_events[i].filter(line)) {
char *s = strdup(line);
xwrite(log_events[i].fd, &s, sizeof(s));
}
log_pid = exec_command(0, &log_fd, NULL,
"/system/bin/logcat",
"-b", "events", "-b", "main", "-b", "crash",
"-v", "threadtime",
"-s", "am_proc_start", "Magisk", "*:F",
NULL);
FILE *logs = fdopen(log_fd, "r");
while (fgets(line, sizeof(line), logs)) {
if (line[0] == '-')
continue;
size_t len = strlen(line);
for (int i = 0; i < EVENT_NUM; ++i) {
if (log_events[i].fd > 0 && log_events[i].filter(line))
xwrite(log_events[i].fd, line, len);
}
if (kill(log_pid, 0))
break;
}
// Cleanup
close(log_fd);
fclose(logs);
log_fd = -1;
kill(log_pid, SIGTERM);
waitpid(log_pid, NULL, 0);
// Clear buffer before restart
exec_command_sync("logcat", "-b", "events", "-b", "main", "-c", NULL);
test_logcat();
}
@ -105,43 +106,6 @@ static void *logger_thread(void *args) {
return NULL;
}
static void *magisk_log_thread(void *args) {
rename(LOGFILE, LOGFILE ".bak");
FILE *log = xfopen(LOGFILE, "w");
setbuf(log, NULL);
int pipefd[2];
if (xpipe2(pipefd, O_CLOEXEC) == -1)
return NULL;
LOGD("log_monitor: magisk log dumper start");
// Register our listener
log_events[LOG_EVENT].fd = pipefd[1];
for (char *line; xxread(pipefd[0], &line, sizeof(line)) > 0; free(line))
fprintf(log, "%s", line);
return NULL;
}
static void *debug_magisk_log_thread(void *args) {
FILE *log = xfopen(DEBUG_LOG, "a");
setbuf(log, NULL);
int pipefd[2];
if (xpipe2(pipefd, O_CLOEXEC) == -1)
return NULL;
LOGD("log_monitor: debug log dumper start");
// Register our listener
log_events[DEBUG_EVENT].fd = pipefd[1];
for (char *line; xxread(pipefd[0], &line, sizeof(line)) > 0; free(line))
fprintf(log, "%s", line);
return NULL;
}
/* Start new threads to monitor logcat and dump to logfile */
void monitor_logs() {
pthread_t thread;
@ -149,46 +113,14 @@ void monitor_logs() {
test_logcat();
if (loggable) {
// Start log file dumper before monitor
xpthread_create(&thread, NULL, magisk_log_thread, NULL);
pthread_detach(thread);
rename(LOGFILE, LOGFILE ".bak");
log_events[LOG_EVENT].fd = creat(LOGFILE, 0644);
#ifdef MAGISK_DEBUG
log_events[DEBUG_EVENT].fd = creat(DEBUG_LOG, 0644);
#endif
// Start logcat monitor
xpthread_create(&thread, NULL, logger_thread, NULL);
pthread_detach(thread);
}
}
void start_debug_full_log() {
#ifdef MAGISK_DEBUG
if (loggable) {
// Log everything initially
debug_log_fd = xopen(DEBUG_LOG, O_WRONLY | O_CREAT | O_CLOEXEC | O_TRUNC, 0644);
debug_log_pid = exec_command(0, &debug_log_fd, NULL, "logcat", "-v", "threadtime", NULL);
close(debug_log_fd);
}
#endif
}
void stop_debug_full_log() {
#ifdef MAGISK_DEBUG
// Stop recording the boot logcat after every boot task is done
if (debug_log_pid > 0) {
kill(debug_log_pid, SIGTERM);
waitpid(debug_log_pid, NULL, 0);
// Start debug thread
start_debug_log();
}
#endif
}
void start_debug_log() {
#ifdef MAGISK_DEBUG
if (loggable) {
pthread_t thread;
// Start debug thread
xpthread_create(&thread, NULL, debug_magisk_log_thread, NULL);
pthread_detach(thread);
}
#endif
}

3
native/jni/include/logging.h
View File

@ -61,9 +61,6 @@ extern struct log_listener log_events[];
extern int loggable;
void monitor_logs();
void start_debug_full_log();
void stop_debug_full_log();
void start_debug_log();
#endif

8
native/jni/magiskhide/proc_monitor.c
View File

@ -132,12 +132,12 @@ void proc_monitor() {
xpipe2(pipefd, O_CLOEXEC);
log_events[HIDE_EVENT].fd = pipefd[1];
for (char *log, *line;; free(log)) {
if (read(pipefd[0], &log, sizeof(log)) != sizeof(log)) {
FILE *logs = fdopen(pipefd[0], "r");
char log[PIPE_BUF], *line;
while (1) {
/* It might be interrupted */
log = NULL;
if (fgets(log, sizeof(log), logs) == NULL)
continue;
}
char *ss = strchr(log, '[');
int pid, ppid, ret, comma = 0;
char *pos = ss, proc[256], ns[32], pns[32];