Start unifying with log monitor

jni/Android.mk

@@ -1,7 +1,34 @@
 LOCAL_PATH := $(call my-dir)
 
-include jni/magiskboot/Android.mk
-include jni/magiskhide/Android.mk
-include jni/resetprop/Android.mk
-include jni/magiskpolicy/Android.mk
-include jni/su/Android.mk
+include $(CLEAR_VARS)
+LOCAL_MODULE := magisk
+LOCAL_STATIC_LIBRARIES := libselinux libsepol
+
+LOCAL_C_INCLUDES := \
+	$(LOCAL_PATH)/utils \
+	$(LOCAL_PATH)/selinux/libselinux/include \
+	$(LOCAL_PATH)/selinux/libsepol/include
+
+LOCAL_SRC_FILES := \
+	main.c \
+	utils/log_monitor.c \
+	utils/vector.c \
+	utils/xwrap.c
+
+LOCAL_CFLAGS := -static
+LOCAL_LDLIBS := -llog
+
+include $(BUILD_EXECUTABLE)
+
+# Libraries
+include jni/selinux/libselinux/Android.mk
+include jni/selinux/libsepol/Android.mk
+
+# Enable these for seperate binaries
+# By default, we create a unified binary
+
+# include jni/magiskboot/Android.mk
+# include jni/magiskhide/Android.mk
+# include jni/resetprop/Android.mk
+# include jni/magiskpolicy/Android.mk
+# include jni/su/Android.mk

jni/magisk.h

@@ -0,0 +1,24 @@
+#ifndef _MAGISK_H_
+#define _MAGISK_H_
+
+#include <errno.h>
+#include <string.h>
+#include <android/log.h>
+
+#define LOG_TAG    "Magisk"
+
+#ifdef DEBUG
+#define LOGD(...)  __android_log_print(ANDROID_LOG_DEBUG, LOG_TAG, __VA_ARGS__)
+#else
+#define LOGD(...)  stub(__VA_ARGS__)
+#endif
+#define LOGE(...)  __android_log_print(ANDROID_LOG_ERROR, LOG_TAG, __VA_ARGS__)
+#define PLOGE(fmt, args...) LOGE(fmt " failed with %d: %s", ##args, errno, strerror(errno))
+
+void stub(const char *fmt, ...);
+
+// Global buffer
+#define BUF_SIZE 4096
+extern char magiskbuf[BUF_SIZE];
+
+#endif

jni/main.c

@@ -0,0 +1,16 @@
+/* main.c - The entry point, should be mutli-call
+ */
+
+#include "utils.h"
+#include "magisk.h"
+
+// Global buffer
+char magiskbuf[BUF_SIZE];
+
+void stub(const char *fmt, ...) {}
+
+int main(int argc, char const *argv[]) {
+	// Start new thread to monitor logs
+	monitor_logs();
+	return 0;
+}

jni/utils/log_monitor.c

@@ -0,0 +1,32 @@
+/* log_monitor.c - New thread to monitor logcat
+ *
+ * Open a new thread to call logcat and get logs with tag "Magisk"
+ * Also, write the logs to a log file for debugging purpose
+ *
+ */
+
+#include <stdio.h>
+#include <pthread.h>
+
+#include "utils.h"
+
+static void *logger_thread(void *args) {
+	rename("/cache/magisk.log", "/cache/last_magisk.log");
+	FILE *logfile = xfopen("/cache/magisk.log", "w");
+	// Disable buffering
+	setbuf(logfile, NULL);
+	// Start logcat
+	FILE *p = popen("logcat -s Magisk", "r");
+	while (fgets(magiskbuf, BUF_SIZE, p)) {
+		fprintf(logfile, "%s", magiskbuf);
+	}
+	return NULL;
+}
+
+/* Start a new thread to monitor logcat and dump to file */
+void monitor_logs() {
+	pthread_t log_monitor;
+	pthread_create(&log_monitor, NULL, logger_thread, NULL);
+	printf("Hello :)\n");
+	pthread_join(log_monitor, NULL);
+}

jni/utils/utils.h

@@ -0,0 +1,21 @@
+#ifndef _UTILS_H_
+#define _UTILS_H_
+
+#include <sys/types.h>
+#include <stdio.h>
+
+#include "magisk.h"
+
+// xwrap.c
+
+FILE *xfopen(const char *pathname, const char *mode);
+
+// vector.c
+
+#include "vector.h"
+
+// log_monitor.c
+
+void monitor_logs();
+
+#endif

jni/utils/vector.c

@@ -0,0 +1,34 @@
+/* vector.c - A simple vector implementation in c
+ */
+
+#include <stdlib.h>
+
+#include "vector.h"
+
+void vec_init(struct vector *v) {
+	vec_size(v) = 0;
+	vec_cap(v) = 1;
+	vec_entry(v) = malloc(sizeof(void*));
+}
+
+void vec_push_back(struct vector *v, void *p) {
+	if (v == NULL) return;
+	if (vec_size(v) == vec_cap(v)) {
+		vec_cap(v) *= 2;
+		vec_entry(v) = realloc(vec_entry(v), sizeof(void*) * vec_cap(v));
+	}
+	vec_entry(v)[vec_size(v)] = p;
+	++vec_size(v);
+}
+
+void vec_sort(struct vector *v, int (*compar)(const void *, const void *)) {
+	qsort(vec_entry(v), vec_size(v), sizeof(void*), compar);
+}
+
+void vec_destroy(struct vector *v) {
+	// Will not free each entry!
+	// Manually free each entry, then call this function
+	vec_size(v) = 0;
+	vec_cap(v) = 0;
+	free(v->data);
+}

jni/utils/vector.h

@@ -0,0 +1,26 @@
+/* vector.h - A simple vector implementation in c
+ */
+
+#ifndef _VECTOR_H_
+#define _VECTOR_H_
+
+#include <sys/types.h>
+
+struct vector {
+	size_t size;
+	size_t cap;
+	void **data;
+};
+void vec_init(struct vector *v);
+void vec_push_back(struct vector *v, void *p);
+void vec_sort(struct vector *v, int (*compar)(const void *, const void *));
+void vec_destroy(struct vector *v);
+#define vec_size(v) (v)->size
+#define vec_cap(v) (v)->cap
+#define vec_entry(v) (v)->data
+/* Usage: vec_for_each(vector *v, void *e) */
+#define vec_for_each(v, e) \
+	e = (v)->data[0]; \
+	for (size_t _ = 0; _ < (v)->size; ++_, e = (v)->data[_])
+
+#endif

jni/utils/xwrap.c

@@ -0,0 +1,21 @@
+/* xwrap.c - wrappers around existing library functions.
+ *
+ * Functions with the x prefix are wrappers that either succeed or kill the
+ * program with an error message, but never return failure. They usually have
+ * the same arguments and return value as the function they wrap.
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "utils.h"
+
+FILE *xfopen(const char *pathname, const char *mode) {
+	FILE *fp = fopen(pathname, mode);
+	if (fp == NULL) {
+		PLOGE("fopen");
+		exit(1);
+	}
+	return fp;
+}